Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation
Commission
HOME
EVENTS
DATA
Data List
Drilling
Production
Orders
Data Miner
Document Search
REPORTS
Reports and Charts
Pool Statistics
FORMS
LINKS
Links
Test Notification
Data Requests
Regulations
Industry Guidance Bulletins
How to Apply
ABOUT US
History
Staff
HELP
Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
197-158
Nolan Vlahovich Hilcorp Alaska, LLC Geotech 3800 Centerpoint Drive, Suite 1400 Anchorage, AK 99503 Tele: (907) 564-4558 E-mail: nolan.vlahovich@hilcorp.com Please acknowledge receipt by signing and returning one copy of this transmittal. Received By: Date: Date: 2/20/2025 To: Alaska Oil & Gas Conservation Commission Natural Resource Technician 333 W 7th Ave Suite 100 Anchorage, AK 99501 SFTP DATA TRANSMITTAL T#20250220 Well API #PTD #Log Date Log Company Log Type AOGCC ESet # BCU 18RD 50133205840100 222033 1/27/2025 AK E-LINE Patch BRU 223-24 50283201830000 221072 1/26/2025 AK E-LINE Perf CLU 10RD 50133205530100 222113 11/2/2024 YELLOWJACKET PLUG GP 03-87 50733204370000 166052 12/16/2024 AK E-LINE Plug/Cement IRU 44-36 50283200890000 193022 1/22/2025 AK E-LINE Perf KU WD-01 50133203450000 181107 10/15/2024 YELLOWJACKET PERF MPI 1-29 50029216690000 186181 1/29/2025 AK E-LINE Perf MPU C-39 50029228490000 197248 1/27/2025 AK E-LINE TubingCut MPU E-20A 50029225610100 204054 2/1/2025 READ CaliperSurvey MPU K-33 50029227290000 196202 2/8/2025 AK E-LINE TubeCut MPU S-08 50029231680000 203123 2/6/2025 AK E-LINE CmtRtr/Punch MRU A-13 50733200770000 168002 2/6/2025 AK E-LINE TubingPunch MRU M-02 50733203890000 187061 1/22/2025 AK E-LINE Perf MRU M-32RD2 50733204620200 217091 2/10/2025 AK E-LINE TubingPunch NCIU A-09 50883200290100 222024 1/31/2025 AK E-LINE Perf NCIU A-16 50883201270000 208098 1/30/2025 AK E-LINE Perf NCIU A-21 50883201990000 224086 1/15/2025 AK E-LINE Plug, Perf NK-41A 50029227780100 197158 1/6/2025 HALLIBURTON Coilflag PAVE 3-1 50029238060000 224140 1/4/2025 YELLOWJACKET CBL PBU P1-13 50029223720000 193074 12/3/2024 HALLIBURTON PPROF PTM P1-07A 50029219960100 204037 12/31/2024 YELLOWJACKET PPROF Please include current contact information if different from above. T40127 T40128 T40129 T40130 T40131 T40132 T40133 T40134 T40135 T40136 T40137 T40138 T40139 T40140 T40141 T40142 T40143 T40144 T40145 T40146 T40147 NK-41A 50029227780100 197158 1/6/2025 HALLIBURTON Coilflag Gavin Gluyas Digitally signed by Gavin Gluyas Date: 2025.02.20 14:09:18 -09'00' Nolan Vlahovich Hilcorp Alaska, LLC Geotech 3800 Centerpoint Drive, Suite 1400 Anchorage, AK 99503 Tele: (907) 564-4558 E-mail: nolan.vlahovich@hilcorp.com Please acknowledge receipt by signing and returning one copy of this transmittal. Received By: Date: Date: 2/16/2025 To: Alaska Oil & Gas Conservation Commission Natural Resource Technician 333 W 7th Ave Suite 100 Anchorage, AK 99501 SFTP DATA TRANSMITTAL T#20250216 Well API #PTD #Log Date Log Company Log Type AOGCC Eset # BRU 232-04 50283100230000 132037 1/18/2025 AK E-LINE Perf CLU 08 50133205340000 204005 2/13/2025 YELLOWJACKET SCBL CLU 10RD2 50133205530200 224135 1/2/2025 YELLOWJACKET SCBL CLU 10RD2 50133205530200 224135 12/13/2024 YELLOWJACKET SCBL CLU 7 50133205310000 203191 1/25/2025 YELLOWJACKET SCBL IRU 44-36 50283200890000 193022 1/21/2025 AK E-LINE Plug/Perf KALOTSA 10 50133207320000 224147 2/11/2025 YELLOWJACKET SCBL KALOTSA 9 50133207310000 224145 1/26/2025 YELLOWJACKET SCBL KBU 22-06Y 50133206500000 215044 1/11/2025 YELLOWJACKET SCBL KU 13-06A 50133207160000 223112 1/12/2025 YELLOWJACKET SCBL MRU M-25 50733203910000 187086 1/15/2024 AK E-LINE PPROF NCIU A-21 50883201990000 224086 1/6/2024 AK E-LINE Plug/Perf PBU 06-05A 50029202980100 224115 1/14/2025 HALLIBURTON RBT PBU 09-35B 50029213140200 224122 2/3/2025 HALLIBURTON RBT PBU B-12B 50029203320200 224133 1/20/2025 HALLIBURTON RBT PBU D-12 50029204430000 180015 12/19/2024 BAKER SPN PBU F-08B 50029201350200 212040 1/27/2025 HALLIBURTON RBT PBU NK-41A 50029227780100 197158 12/18/2024 YELLOWJACKET CBL PBU S-100A 50029229620100 224083 1/5/2025 HALLIBURTON RBT Revision Explanation: Annotations added to processed log. Please include current contact information if different from above. 162-037 T40080 T40081 T40082 T40082 T40083 T40084 T40085 T40086 T40087 T40088 T40089 T40090 T40091 T40092 T40093 T40094 T40095 T40096 T40097 PBU NK-41A 50029227780100 197158 12/18/2024 YELLOWJACKET CBL Gavin Gluyas Digitally signed by Gavin Gluyas Date: 2025.02.18 13:06:47 -09'00' MEMORANDUM State of Alaska Alaska Oil and Gas Conservation Commission TO: Jim Regg DATE: P.I. Supervisor SUBJECT: FROM: Petroleum Inspector Section: 36 Township: 12N Range: 15E Meridian: Umiat Drilling Rig: Parker 273 Rig Elevation: Total Depth: 23,561 ft MD Lease No.: ADL034630 Operator Rep: Suspend: P&A: XXX Conductor: 20" O.D. Shoe@ 121 Feet Csg Cut@ Feet Surface: 13 3/8" O.D. Shoe@ 7041 Feet Csg Cut@ Feet Intermediate: 9 5/8" O.D. Shoe@ 17661 Feet Csg Cut@ 5600 Feet Production: O.D. Shoe@ Feet Csg Cut@ Feet Liner: O.D. Shoe@ Feet Csg Cut@ Feet Tubing: O.D. Tail@ Feet Tbg Cut@ Feet Type Plug Founded on Depth (Btm) Depth (Top) MW Above Verified Fullbore Retainer 5,639 ft 5,589 ft 9.8 ppg Drillpipe tag Initial 15 min 30 min 45 min Result Tubing 2650 2610 2600 IA 2650 2610 2600 OA Initial 15 min 30 min 45 min Result Tubing IA OA Remarks: Attachments: Plug for redrill. Formation isolation plug. The existing well has no tubing or intermediate casing, only 13 3/8-inch surface casing. Set 4K lbs on cement plug with drill string. February 1, 2025 Brian Bixby Well Bore Plug & Abandonment PBU NK-41A Hilcorp North Slope LLC PTD 1971580; Sundry 325-030 none Test Data: P Casing Removal: Shane Barber Casing/Tubing Data (depths are MD): Plugging Data (depths are MD): rev. 3-24-2022 2025-0201_Plug_Verification_PBU_NK-41A_bb 9 9 9 9 9 9 9 9 9 9 99 9 9 9 9 9 9 9 9 9 9 9 9 9 James B. Regg Digitally signed by James B. Regg Date: 2025.02.07 15:23:25 -09'00' STATE OF ALASKA OIL AND GAS CONSERVATION COMMISSION BOPE Test Report for: Reviewed By: P.I. Suprv Comm ________PRUDHOE BAY UN NIA NK-41A JBR 03/17/2025 MISC. INSPECTIONS: FLOOR SAFTY VALVES:CHOKE MANIFOLD:BOP STACK: ACCUMULATOR SYSTEM:MUD SYSTEM: P/F P/F P/FP/FP/F Visual Alarm QuantityQuantity Time/Pressure SizeQuantity Number of Failures:1 H2S sensor in Cellar failed and was replaced Test Results TEST DATA Rig Rep:Brandon Davis/Kaleo EOperator:Hilcorp North Slope, LLC Operator Rep:Shane Barber/Oliver Amend Rig Owner/Rig No.:Parker 273 PTD#:1971580 DATE:1/28/2025 Type Operation:WRKOV Annular: 250/3500Type Test:INIT Valves: 250/4500 Rams: 250/4500 Test Pressures:Inspection No:bopAGE250129175311 Inspector Adam Earl Inspector Insp Source Related Insp No: INSIDE REEL VALVES: Quantity P/F (Valid for Coil Rigs Only) Remarks: Test Time 8.5 MASP: 2686 Sundry No: 325-030 Control System Response Time (sec) Time P/F Housekeeping:P PTD On Location P Standing Order Posted P Well Sign P Hazard Sec.P Test Fluid W Misc NA Upper Kelly 1 P Lower Kelly 1 P Ball Type 2 P Inside BOP 1 P FSV Misc 0 NA 15 PNo. Valves 1 PManual Chokes 1 PHydraulic Chokes 0 NACH Misc Stripper 0 NA Annular Preventer 1 13 5/8 P #1 Rams 1 9 5/8 P #2 Rams 1 Blind P #3 Rams 1 2 7/8 X 5"P #4 Rams 0 NA #5 Rams 0 NA #6 Rams 0 NA Choke Ln. Valves 1 3 1/8 P HCR Valves 2 3 1/8 P Kill Line Valves 2 2 1/16 3 1/8 P Check Valve 0 NA BOP Misc 0 NA System Pressure P3000 Pressure After Closure P1975 200 PSI Attained P19 Full Pressure Attained P62 Blind Switch Covers:PAll Stations Bottle precharge P Nitgn Btls# &psi (avg)P14@2360 ACC Misc NA0 P PTrip Tank P PPit Level Indicators P PFlow Indicator P PMeth Gas Detector P FPH2S Gas Detector 0 NAMS Misc Inside Reel Valves 0 NA Annular Preventer P20 #1 Rams P6 #2 Rams P6 #3 Rams P6 #4 Rams NA0 #5 Rams NA0 #6 Rams NA0 HCR Choke P2 HCR Kill P2 9 9 99 9 9999 9 H2S sensor in Cellar failed FP 5660, 17015, 18543, 22900 Frank Roach for Sean M. By Grace Christianson at 3:04 pm, Jan 23, 2025 325-030 I am approving this document 1/23/25 1:11:00 PM Frank Roach (4431) X JJL 1/23/25 AOGCC witnessed BOP Test to 3000 psi, annular to 2500 psi minimum. AOGCC witnessed tag and pressure test to 2500 psi of cement plug. Email digital data of casing test, cementing summary, and FIT to AOGCC upon completion of FIT 10-407 SFD 1/24/2025 X *&: Jessie L. Chmielowski Digitally signed by Jessie L. Chmielowski Date: 2025.01.24 08:34:53 -09'00'01/24/25 RBDMS JSB 012425 Page 15 Prudhoe Bay East NK-41B Sag/Ivishak Producer Drilling Procedure 11.0 Decomplete, Cut & Pull 9-5/8”, Set 13-3/8” P&A Plug 11.1 Pull hanger and pup joint to rig floor and L/D. 11.2 P/U 8-1/2” cleanout assembly: x Ensure BHA components have been inspected previously. x Drift and caliper all components before M/U. Visually verify no debris inside components that cannot be drifted. x Utilize used roller cone bit with jets removed for maximum flow. x Drill string will be 5” 19.5# S-135. 11.3 RIH w/cleanout assy to ~5,660’ MD (Last tagged by e-line on 1/12/2025) 11.4 Slowly wash down and tag cement plug from pre-rig work. CBU 2-4x ensuring clean 9.8ppg brine in and out. 11.5 Flow check well. POOH & LD cleanout assembly 11.6 MU mechanical casing cutter BHA per fishing representative. Make sure cutters are dressed to be able to cut 9-5/8” 47# BTC-M casing. 11.7 RIH to cut depth @ ~5,600’ MD. Locate the collars above and below proposed cut depth. Cut casing in the middle of the joint identified by the coupling locate. x After the pressure drop indicating the cut is seen spin the cutter for an additional 15 minutes. This helps to ensure that the cutter blades have completely cut through the casing. x If the cut appears to go poorly (casing grabs blades, other anomalies), plan to make the casing stub polishing run. Final decision for the polishing/scraper run may be made once the cut joint is pulled 11.8 Line up to take returns from the OA to the flowback tank(s). Close annular around drillpipe, break circulation, and CBU 2x min at max rate. After consistent brine is observed in and out, shut down and flow check well for 30 minutes to confirm well is in balance. 11.9 POOH and LD casing cutter BHA. 11.10 Back out lockdown screws. x Reporting is inconsistent on the 9-5/8” casing set. Drilling report states casing was set on slips, but the tally summary sheet notes a casing hanger. Be prepared for the potential of casing growth. If the last couple lockdown screws become tight when backing out, Stop and retighten LDS. RIH w/HWDP/collars and hang off with a RTTS (or equivalent) packer. While staying connected to the packer, attempt to back out LDS again. Once successful, release RTTS, lay down packer, and HWDP. Page 16 Prudhoe Bay East NK-41B Sag/Ivishak Producer Drilling Procedure 11.11 Spear and pull 9-5/8” casing to the floor. Release spear and LD same. LD 9-5/8” casing down to the cut. Note torque required to break connections, overall condition of the casing, and the cut. Depending on condition, joints may be salvaged for future shoetrack/pup joints. Inspect casing for NORM prior to removal from location. 11.12 MU 13-3/8” drift/cleanout assembly. Ensure casing scraper or smooth OD stabilizer / string mill is in the BHA to clean area where retainer is to be set. Also ensure BHA is close to mimicking whipstock assembly for drifting. RIH to 9-5/8” casing stump. 11.13 CBU at least 2x @ max rate to ensure clean casing. Wipe retainer setting area multiple times to help ensure a good set. POOH & LD cleanout BHA. 11.14 MU 13-3/8” cement retainer and RIH t/50’ above the casing stub. Ensure retainer is spaced out such that it won’t be set across a connection. Set retainer and slack off string weight to confirm retainer is set. x Provide AOGCC inspector 24 hr notice of retainer set for opportunity to witness weight testing to confirm set. 11.15 Establish injection below the retainer. Once pressure breaks over, pump additional 5 bbls to confirm injection. 11.16 Unsting from the retainer and spot 45 bbls 15.8ppg Class G cement within 5 bbls of the end of the stinger. Estimated Total Cement Volume: Cement Slurry Design: Tail Slurry System HalCem Density 15.8 lb/gal Yield 1.16 ft3/sk Mix Water 4.98 gal/sk Page 17 Prudhoe Bay East NK-41B Sag/Ivishak Producer Drilling Procedure 11.17 Once spotted, sting back into the retainer and squeeze 30 bbls below the retainer. This volume is 150’ worth of 13-3/8” capacity (22.5 bbls) plus 7.5 bbls excess. 11.18 With 15 bbls left in the workstring/stinger, unsting and spot remaining 15 bbls on top of the retainer. This volume equates to 50’ of 13-3/8” capacity above the retainer (7.5 bbls), plus another 7.5 bbls excess. 11.19 Pull up above the cement spotted on top of the retainer and circulate to clean up string. POOH & LDBHA 11.20 Wait on cement to reach a minimum of 500psi compressive strength before continuing. Page 18 Prudhoe Bay East NK-41B Sag/Ivishak Producer Drilling Procedure 12.0 Set Whipstock, Mill 12-1/4” Window 12.1 MU 13-3/8” cleanout assembly (to include 12-1/4” bit and 13-3/8” casing scraper). Space out casing scraper where it will cover planned whipstock setting depth and contingency bridge plug depth. RIH with cleanout assembly to ~100’ above the abandonment plug. 12.2 Slowly RIH and tag cement on top of retainer. CBU 2-4x while pumping pills/sweeps to help in cleaning the 13-3/8” casing. Ensure fluid is consistent both in and out before shutting down. 12.3 RU casing testing equipment and PT 13-3/8” casing to 2500 psi for 30 min, chart test. Ensure rams are used to test casing as per AOGCC Industry Guidance Bulletin 17-001. x Provide AOGCC inspector 24 hr notice for opportunity to witness pressure test. 12.4 Flow check well for 10 minutes prior to tripping out. POOH & LD cleanout assembly. 12.5 Whipstock set depth information: x Planned TOW: 4,254’ x Whipstock should be set to avoid a collar while milling the window. x Drilling Foreman, Whipstock hand, and drilling engineer to agree on set depth 12.6 MU 12-1/4” mill/whipstock assembly as per WIS tally: x MU HWDP, string magnets, and float sub x Ensure ditch magnets are installed in shaker room and cleaned prior to running in with the whipstock 12.7 Install MWD and orient. Rack back mill assembly x Ensure a dedicated MWD is available for the orientation of the whipstock 12.8 Verify offset between MWD and the whipstock tray, witnessed and agreed by the Drilling Foreman, MWD/DD personnel, and WIS rep. Document and record offset in well file. 12.9 Slowly RIH with whipstock assembly per WIS rep. x RIH no faster than 1.5 to 2 minutes per stand. x Ensure workstring is stationary prior to setting in slips to avoid weakening shear bolt and prematurely tripping/setting the anchor. 12.10 Stop 30-45’ above planned set depth. Work torque out of string. Measure and record P/U and S/O weights. Obtain survey with MWD for orienting whipstock. 12.11 Orient whipstock to desired direction by turning DP in ¼ round increments. P/U and S/O on DP to work all torque out after oriented. (Being careful not to set trip anchor). Target orientation is 30q LOHS – Consult with milling hand 12.12 Whipstock orientation: Page 19 Prudhoe Bay East NK-41B Sag/Ivishak Producer Drilling Procedure x Desired orientation of the whipstock face is 15R to 45R, target is 20 ROHS x Hole Angle at window interval (@ 4,254’, 55° inc, 46° azi) x Sidetrack tangent section is 74q inclination and 63q azimuth 12.13 Once whipstock is in the desired orientation, set whipstock per WIS rep. 12.14 Displace well over to 9.0 ppg milling fluid. Confirm fluid in and out has correct parameters and sufficient for moving metal shavings/cuttings uphole: x Funnel visc: 40-60s x YP: 18-20 12.15 Record P/U, S/O weights, and free rotation. Slack off to top of whipstock and with light weight and low torque. Mill window as per whipstock contractor representative. Pump high visc sweeps as necessary. 12.16 Clean catch trays and ditch magnets frequently while milling window to collect metal cuttings/shavings. Track weight of recovered metal to gauge whether window milling was complete. 12.17 Mill window until the uppermost mill has passed across the entire tray. Dress and polish window as needed. 12.18 With upper mill at the end of the tray, this will drill ~ 20’ of new hole. 12.19 After window is milled but before POOH, shut down pumps and work milling assembly through window watching for drag. Dress and polish window as needed. After reaming, shut off pumps and rotary and dry drift window. 12.20 Circulate bottoms up until even MW in/out and hole is clean of metal shavings. Reduce mud properties for drilling or displace over to 9.0 ppg LSND drilling fluid. 12.21 Pull window milling assembly into 13-3/8” casing and perform FIT to 12.5ppg EMW. Chart test. Ensure test is recorded on same chart as the casing test. Document incremental volume pumped (and subsequent pressure) and volume returned. 45R 15R Page 20 Prudhoe Bay East NK-41B Sag/Ivishak Producer Drilling Procedure x 13-3/8” surface casing is fully cemented. Open hole weak point is the top of the window and ~ 4,254’ MD / ~ 3,956’ TVD. x 12.5 ppg FIT value is to cover over and above expected ECD while drilling interval. x 12.3 ppg provides >25 bbls based on 11.0 ppg MW +0.5ppg intensity, 10.0 ppg PP. x If 12.3 ppg EMW is not achieved, contact drilling engineer. 12.22 POOH and LD window milling BHA. Gauge all mills for wear. Depending on results, have backup milling assembly ready to dress window to desired dimensions. 12.23 PU stack washer and wash across BOPE. Function all rams to clear any potential milling debris. 13-3/8" Whipstock @ ~4,255' MD Performed 10/29/1997 Performed 10/29/1997 Pressure Tested 10/31/1997 Csg Punches @ ~6,990' MD 1st cut 22,872' on 10/14/97 9-5/8" plug @ ~7,150' MD TOC ~6,000' MD Planned Pre-Rig 1997 P&A Kuparuk 1997 P&A Ivishak 13-3/8" Whipstock @ ~4,255' MD Performed 10/29/1997 Performed 10/29/1997 Pressure Tested 10/31/1997 Csg Punches @ ~6,990' MD 1/8/25 1st cut 22,872' on 10/14/97 9-5/8" plug @ ~7,135' MD (mid-element) 1/7/25 TOC ~5,660' MD e-line Tag 1/12/25 Current Pre-Rig 1997 P&A Kuparuk 1997 P&A Ivishak Csg Punches @ ~5,518 MD & ~5,540' MD 1/16/25 1st cut 22,872' on 10/14/97 Updated Pre-Sidetrack 13-3/8" Whipstock @ ~4,254' MD 9-5/8" Casing cut @ ~5,600' MD 1997 P&A Kuparuk 1997 P&A Ivishak 13-3/8" Retainer @ ~5,550' MD Csg Punches @ ~6,990' MD 1/8/25 9-5/8" plug @ ~7,135' MD (mid-element) 1/7/25 TOC ~5,660' MD e-line Tag 1/12/25 1 Gluyas, Gavin R (OGC) From:Lau, Jack J (OGC) Sent:Tuesday, January 14, 2025 12:36 PM To:Michael Hibbert Cc:Rixse, Melvin G (OGC); byork@hilcorp.com Subject:RE: PTD 197-158 - Sundry 324-698 - NK-41A Pre-Rig Rotary Sidetrack Michael – Thanks for taking my call. “NK-41A Pre Sidetrack 12262024 – Rev2” is approved. This work can be performed on the current sundry without resubmission and should be included on the 10-404 with the previously performed work. Thanks, Jack Lau Senior Petroleum Engineer Alaska Oil and Gas Conservation Commission (907) 793-1244 OƯice (907) 227-2760 Cell From: Rixse, Melvin G (OGC) <melvin.rixse@alaska.gov> Sent: Tuesday, January 14, 2025 11:07 AM To: Lau, Jack J (OGC) <jack.lau@alaska.gov> Subject: FW: PTD 197-158 - Sundry 324-698 - NK-41A Pre-Rig Rotary Sidetrack From: Michael Hibbert <Michael.Hibbert@hilcorp.com> Sent: Tuesday, January 14, 2025 8:58 AM To: Rixse, Melvin G (OGC) <melvin.rixse@alaska.gov> Cc: Bo York <byork@hilcorp.com> Subject: PTD 197-158 - Sundry 324-698 - NK-41A Pre-Rig Rotary Sidetrack Hello Mel, This work is to prep NK-41A for a rotary sidetrack that is supposed to be happening in the next 2-3 weeks. The planned cement plug was placed in NK-41A and it appears not to have sealed oƯ the 9-5/8” x 13-3/8” shoe as planned. The CMIT failed and an injectivity of 5 bpm at 2200 psi was established pumping down the 9-5/8” x 13- 3/8” annulus from surface. I propose the following revision (attached Word Doc) to the Sundry #324-698 to pump an additional cement job to isolate the shoe and get a passing CMIT before the rig arrives. Let me know if you have any questions. Thanks, CAUTION: This email originated from outside the State of Alaska mail system. Do not click links or open attachments unless you recognize the sender and know the content is safe. 2 Michael Hibbert LPC Operations Engineer 1-907-903-5990 The information contained in this email message is confidential and may be legally privileged and is intended only for the use of the individual or entity named above. If you are not an intended recipient or if you have received this message in error, you are hereby notified that any dissemination, distribution, or copy of this email is strictly prohibited. If you have received this email in error, please immediately notify us by return email or telephone if the sender's phone number is listed above, then promptly and permanently delete this message. While all reasonable care has been taken to avoid the transmission of viruses, it is the responsibility of the recipient to ensure that the onward transmission, opening, or use of this message and any attachments will not adversely affect its systems or data. No responsibility is accepted by the company in this regard and the recipient should carry out such virus and other checks as it considers appropriate. 10715, 18543, 22900 28 Digitally signed by Bo York (1248) DN: cn=Bo York (1248) Date: 2024.12.12 12:45:05 - 09'00' Bo York (1248) PRUDHOE BAY NIAKUK OIL By Grace Christianson at 2:35 pm, Dec 12, 2024 324-698 10-407 SFD 12/13/2024 X DSR-12/16/24 AOGCC Witnessed TOC Tag and CMIT to 2500 psi. If punches shallower than 6990' are required, gain approval from AOGCC prior. JJL12/16/24 391314 SFD *&: Jessie L. Chmielowski Digitally signed by Jessie L. Chmielowski Date: 2024.12.17 09:58:25 -09'00'12/17/24 RBDMS JSB 121824 NK-41A : Pre Rotary Sidetrack Prep Page 1 of 5 Well Name:NK-41A API Number:50-029-22778-01 Current Status:Not Operable, Suspended Permit to Drill Number:197158 Estimated Start Date:12/28/24 Rig:FB, SL, CT Regulatory Contact:Carrie Janowski Estimated Duration:4 days First Call Engineer:Eric Dickerman Cell Number:307-250-4013 Second Call Engineer:Jerry Lau Cell Number:907-360-6233 Brief Well Summary: NK-41A is a Suspended well since 1997. NK-41B is a rotary sidetrack planned to target the Eiderhead Block. As part of the decomplete operations the 9-5/8” casing will be cut and pulled to allow exiting the 13-3/8” casing at approximately 4,254’ md. Objective: Pre sidetrack prep. Place a cement plug across the 13-3/8” and 9-5/8” casing strings in preparation for the 9-5/8” cut and pull. Current Bottom Hole Pressure:Not Perforated; 3,476 psi at 7,900’ TVD Max. Anticipated Surface Pressure:2,686 psi using a 0.1 psi/ft gas gradient to surface. Last Shut-in WHP:350 psi, 6/11/24 WSR Min. ID: 6.25” at TBG hanger Max. Deviation:75.29 deg at 11,500’ H2S Concentration:Not Perforated Well Integrity Information: Tbg / IA: MIT of the 9-5/8” casing passed 2,174 psi , 12/11/2024. OA: Open Shoe from injectivity test on 12/11/2024. PPPOT-T: Passed 5000 psi, 4/2/2009 PPPOT-IC: Passed 3500 psi, 4/2/2009 Existing Casing/Tubing Program: String Pipe #/ft Grade Connection Top Bottom Surface Csg. 13-3/8” 68# L-80 BTC Surface 7,041’ Int. Csg. 9-5/8” 47# L-80 BTC-Mod Surface 17,661’ Tbg. 7” 26# L-80 NSCC Surface 2’ NK-41A : Pre Rotary Sidetrack Prep Page 2 of 5 Wellwork Procedure: Fullbore:Done 1. MIT the 9-5/8” casing to 2,000 psi target, 2,200 psi max applied. Use diesel as test fluid. a. 0.25 psi/ft x TVD = 0.25 psi/ft x 7,927’ TVD = 1,982 psi. b. Estimated volume required to pressure up = 8.0 bbl. 2. Attempt to pressure test / injectivity test down the 13-3/8” x 9-5/8” annulus with a 60/40 spear followed by diesel. c. Based on drilling reports the annulus fluid is drilling mud. d. 13-3/8”, 68#, L-80 burst pressure = 4,016 psi (80% of published value). Valve shop:In Progress 3. Confirm tree cap is acceptable for wellwork. RU a quick union tree cap if needed. 4. Ensure IA and OA have integrals to allow circulating. Slickline:In Progress 5. Drift for CBL and HEX plug (5.3” OD) to 8,000’. 6. Log 9-5/8” CBL from 8,000’ to surface. NK-41A : Pre Rotary Sidetrack Prep Page 3 of 5 Coiled Tubing: 7. Drift/log GR/CCL from 8,000’ to surface. Circulate the wellbore to 9.8ppg NaCl. a. Bond log will be added to coil flag if slickline is unable to complete due to deviation. 8. Set 520-963 HEX plug at ~7,150’ (set mid joint to avoid 9-5/8” collars). 9. Circulate the wellbore to 9.8ppg NaCl. Pressure test plug to 1,000 psi. 10. Punch 9-5/8” casing at ~6,990’. Verify circulation through punches. If no circulation, the 9-5/8” punch will be repeated at a shallower depth after confirming with AOGCC. a. Punch parameters: i. 13-3/8” Whipstock target depth = 4,254’ md. ii. 9-5/8” planned cut depth = 5,000’. iii. Minimum 500 ft cement plug the objective. iv. Shallowest allowable punch depth = ~4,500’. 11. Circulate wellbore down the 9-5/8” up the 13-3/8” x 9-5/8” annulus with the following: a. 100 bbl 9.8 ppg NaCl at 140 degF with surfactant b. 950 bbl 9.8 ppg NaCl. 12. Lay in a cement plug in the 9-5/8” casing and the 13-3/8” x 9-5/8” annulus from 7,150’ up to a target TOC of 6,000’. a. Estimated cement volumes: i. 9-5/8” volume from 7,150’ to 6,000’ = 1,150’ x 0.0732 bbl/ft = 85 bbl ii. 13-3/8” x 9-5/8” volume from 6,990’ to 6,000’ = 990’ x 0.0597 bbl/ft = 60 bbl 13. Wait on cement, then AOGCC witnessed tag TOC and CMIT the 9-5/8” and the 13-3/8” to 2,500 psi. AOGCC witnessed tag TOC and CMIT the 9-5/8” and the 13-3/8” to 2,500 psi. shallower depth after confirming with AOGCC NK-41A : Pre Rotary Sidetrack Prep Page 4 of 5 Current Wellbore Schematic: NK-41A : Pre Rotary Sidetrack Prep Page 5 of 5 Proposed Wellbore Schematic: Sundry Application Well Name______________________________ (PTD _________; Sundry _________) Plug for Re-drill Well Workflow This process is used to identify wells that are suspended for a very short time prior to being re-drilled. Those wells that are not re-drilled immediately are identified every 6 months and assigned a current status of "Suspended." Step Task Responsible 1 The initial reviewer will check to ensure that the "Plug for Redrill" box in the upper left corner of Form 10-403 is checked. If the "Abandon" or "Suspend" boxes are also checked, cross out that erroneous entry and initial it on the Form 10-403. Geologist 2 If the “Abandon” box is checked in Box 15 (Well Status after proposed work) the initial reviewer will cross out that checkbox and instead, check the "Suspended" box and initial those changes. Geologist The drilling engineer will serve as quality control for steps 1 and 2. Petroleum Engineer (QC) 3 When the RA2 receives a Form 10-403 with a check in the "Plug for Redrill" box, they will enter the Typ_Work code "IPBRD" into the History tab for the well in RBDMS. This code automatically generates a comment in the well history that states "Intent: Plug for Redrill." Research Analyst 2 4 When the RA2 receives Form 10-407, they will check the History tab in RBDMS for the IPBRD code. If IPBRD is present and there is no evidence that a subsequent re-drill has been completed, the RA2 will assign a status of SUSPENDED to the well bore in RBDMS. The RA2 will update the status on the 10-407 form to SUSPENDED, and date and initial this change. If the RA2 does not see the "Intent: Plug for Redrill" comment or code, they will enter the status listed on the Form 10-407 into RBDMS. Research Analyst 2 5 When the Form 10-407 for the redrill is received, the RA2 will change the original well's status from SUSPENDED to ABANDONED. Research Analyst 2 6 The first week of every January and July, the RA2 and a Geologist or Reservoir Engineer will check the "Well by Type Work Outstanding" user query in RBDMS to ensure that all Plug for Redrill sundried wells have been updated to reflect current status. At this same time, they will also review the list of suspended wells for accuracy and assign expiration dates as needed. Research Analyst 2 Geologist or Reservoir Engineer SFD 12/17/2024 324-698 PBU NK-41A SFD 12/17/2024 197-158 7. Property Designation (Lease Number): 1. Operations Performed: 2. Operator Name: 3. Address: 4. Well Class Before Work:5. Permit to Drill Number: 6. API Number: 8. Well Name and Number: 9. Logs (List logs and submit electronic data per 20AAC25.071): 10. Field/Pool(s): Susp Well Insp Install Whipstock Mod Artificial Lift Perforate New Pool Perforate Plug Perforations Coiled Tubing Ops Other Stimulate Fracture Stimulate Alter Casing Pull Tubing Repair Well Other: Change Approved Program Operations shutdown 11. Present Well Condition Summary: Casing Length Size MD TVD Burst Collapse Exploratory Stratigraphic Development Service 14. Attachments (required per 20 AAC 25.070, 25.071, & 25.283) 16. Well Status after work: 17. I hereby certify that the foregoing is true and correct to the best of my knowledge. OIL GAS WINJ WAG GINJ WDSPL GSTOR Suspended SPLUG Authorized Name and Digital Signature with Date: Authorized Title: Contact Name: Contact Email: Contact Phone: PBU NK-41A Hilcorp North Slope, LLC 3800 Centerpoint Dr, Suite 1400, Anchorage, AK 99503 197-158 50-029-22778-01-00 23561 Conductor Surface Intermediate Production Liner 10081 80 7000 17623 16496 20" 13-3/8" 9-5/8" 7773 41 - 121 41 - 7041 38 - 17661 41 - 121 41 - 4925 38 - 8123 20148 520 2260 4760 17015 , 18543 , 22900 1530 5020 6870 none none Structural No Packer No SSSV none none Bo York Operations Manager Ryan Holt Ryan.Holt@hilcorp.com (907) 659- 5102 PRUDHOE BAY / NIAKUK OIL Total Depth Effective Depth measured true vertical feet feet feet feet measured true vertical measured measured feet feet feet feet measured true vertical Plugs Junk Packer Measured depth True Vertical depth feet feet Perforation depth Tubing (size, grade, measured and true vertical depth) Packers and SSSV (type, measured and true vertical depth) 12. Stimulation or cement squeeze summary: Intervals treated (measured): Treatment descriptions including volumes used and final pressure: 13a.Representative Daily Average Production or Injection Data Oil -Bbl Gas-Mcf Water -Bbl Casing Pressure Tubing Pressure Prior to well operation: Subsequent to operation: 15. Well Class after work: Exploratory Development Service StratigraphicDaily Report of Well Operations Copies of Logs and Surveys Run Electronic Fracture Stimulation Data Sundry Number or N/A if C.O. Exempt: ADL 0034630 , 0034635 , 00391381 , 00390314 0 0 0 0 0 0 0 0 0 0 N/A 13b. Pools active after work: STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION REPORT OF SUNDRY WELL OPERATIONS Sr Pet Eng: Sr Pet Geo: Form 10-404 Revised 10/2022 Submit in PDF format to aogcc.permitting@alaska.gov Sr Res Eng: Due Within 30 days of Operations Digitally signed by Bo York (1248) DN: cn=Bo York (1248) Date: 2024.07.10 16:26:21 - 08'00' Bo York (1248) By Grace Christianson at 9:23 am, Jul 11, 2024 RBDMS JSB 071124 WCB 9-30-2024 DSR-7/11/24 ACTIVITYDATE SUMMARY 6/11/2024 No tubing/O = 350/ 0psi. Temp = SI. WHPs (Well inspection). (Inspected by Kam St.John). No AL or flowline. Wellhead, wellhouse and cellar are clean and dry. Surface area around well is clean and free of debris. Well ID sign attached to wellhouse. SV = C. MV = LOTO. IA, OA = OTG. 6/10/2024 T/I/O = LOTO/410/20. Temp = SI. WHPs (Pre-inspection). No AL or flowline. MV has black Ops lock on it, locked in closed position. Scaffolding removed. Site clean and free of debris. No leaks or sheen observed. SV, WV, SSV, MV = C. IA, OA = OTG. 11:30 Daily Report of Well Operations PBU NK-41A Suspended Well Inspection Review Report Reviewed By: P.I. Suprv Comm ________ JBR 07/24/2024 InspectNo:susKPS240611142310 Well Pressures (psi): Date Inspected:6/11/2024 Inspector:Kam StJohn If Verified, How?Other (specify in comments) Suspension Date:11/2/1997 Tubing: IA:350 OA:350 Operator:Hilcorp North Slope, LLC Operator Rep:Ryan Holt Date AOGCC Notified:6/10/2024 Type of Inspection:Subsequent Well Name:PRUDHOE BAY UN NIA NK-41A Permit Number:1971580 Wellhead Condition Well head was good; no visible leaks or stains. Surrounding Surface Condition Good condition. No standing water no sheen and dry gravel on pad. Still some snow in the pit behind well house. Condition of Cellar No rat hole; dry gravel; no sheen. Comments There is no tubing in this well. Location verified with pad map and well sign. Supervisor Comments Suspension Approval:Completion Report Location Verified? Offshore? Fluid in Cellar? Wellbore Diagram Avail? Photos Taken? VR Plug(s) Installed? BPV Installed? Wednesday, July 24, 2024 9 9 9 9 9 $WWDFKPHQWV3KRWRV 2024-0611_Suspend_PBU_NK-41A_photos_ksj Page 1 of 3 Suspended Well Inspection – PBU NK-41A PTD 1971580 AOGCC Inspection Rpt # susKPS240611142941 Photos by AOGCC Inspector K. StJohn 6-11-2024 2024-0611_Suspend_PBU_NK-41A_photos_ksj Page 2 of 3 2024-0611_Suspend_PBU_NK-41A_photos_ksj Page 3 of 3 Operator Name:2. Exploratory Development Service 5 Permit to Drill Number:197-158 6.API Number:50-029-22778-01-00 Hilcorp North Slope, LLC 5. Field/Pools:9. Well Name and Number: Property Designation (Lease Number): 10. 8. NK-41a 7.If perforating: What Regulation or Conservation Order governs well spacing in this pool? Will planned perforations require a spacing exception? Stratigraphic Current Well Class:4. Type of Request:1.Abandon Plug Perforations Fracture Stimulate Repair Well Operations shutdown Renew Suspension Op Shutdown GAS GSTOR WAG SPLUG Abandoned Oil WINJ Exploratory Development 5Stratigraphic Service WDSPL 12. Attachments: PRESENT WELL CONDITION SUMMARY 23561 Effective Depth MD: 11. 9/1/2020 Commission Representative: 15. Suspended 5 Contact Name: Ryan Holt Contact Email: Ryan.Holt@hilcorp.com Authorized Name: Bo York Authorized Title:Operations Manager Authorized Signature: Plug Integrity BOP Test Mechanical Integrity Test Location Clearance Other: Yes No Spacing Exception Required?Subsequent Form Required: Approved by:COMMISSIONER APPROVED BYTHE COMMISSION Date: 5OtherAlter Casing Pull Tubing Conditions of approval: Notify Commission so that a representative may witness Sundry Number: COMMISSION USE ONLY 17. I hereby certify that the foregoing is true and the procedure approved herein will not be deviated from without prior written approval. Detailed Operations Program Packers and SSSV Type: No SSSV Installed Packers and SSSV MD (ft) and TVD (ft): Perforation Depth MD (ft):Tubing Size: Size Total Depth MD (ft):Total Depth TVD(ft): 10081 Effective Depth TVD:Plugs (MD):Junk (MD): Other Stimulate Re-enter Susp Well Suspend Plug for Redrill Perforate Perforate New Pool No Packer No SSSV Installed Date: Liner Well Status after proposed work: 16. Verbal Approval: Change Approved Program 41 - 7041 41 - 4925 14. Estimated Date for Commencing Operations: BOP Sketch 41 - 121 Structural 6870 Proposal Summary 13. Well Class after proposed work: No Packer None Production 16496 7773 41 - 121 520 13-3/8" 9-5/8" Contact Phone: Date: 8/21/2020 4760 80 153020"Conductor 2260 GINJ 5 Post Initial Injection MIT Req'd? Yes No 5 Comm. STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION APPLICATION FOR SUNDRY APPROVALS 20 AAC 25.280 Surface 7001 5020 Intermediate 17624 38 - 17661 38 - 8123 Address:3800 Centerpoint Dr, Suite 1400, Anchorage, AK 99503 3. No 5Yes Casing Length MD TVD Burst Tubing Grade:Tubing MD (ft):Perforation Depth TVD (ft): Collapse MPSP (psi): Wellbore Schematic Comm.Sr Pet Eng Sr Pet Geo Sr Res Eng Form 10-403 Revised 03/2020 Approved application is valid for 12 months from the date of approval. Prudhoe Bay, Niakuk Oil (907) 659 -5102 ADL 034630 , 034635 , 0391381 , 0390314 2014818543 , 22900 By Samantha Carlisle at 12:12 pm, Aug 21, 2020 320-349 Digitally signed by Bo York DN: cn=Bo York, c=US, o=HIlcorp Alaska LLC, ou=Alaska North Slope, email=byork@hilcorp.com Date: 2020.08.21 10:07:01 -08'00' Bo York DSR-8/21/2020SFD 8/21/2020MGR25AUG2020 10-404Yesn Required? Comm 8/25/2020 dts 8/25/2020 JLC 8/25/2020 RBDMS HEW 8/26/2020 Hilcorp North Slope, LLC Bo York, PBE Operations Manager 3800 Centerpoint Dr, Suite 1400 Anchorage, Alaska 99503 August 11, 2020 Mr. Jeremy Price Alaska Oil and Gas Conservation Commission 333 West 7th Avenue Anchorage, Alaska 99501 Subject: Niakuk Well NK-41A (PTD #197158) Application for Renewal of Existing Suspension (10-403) Dear Mr. Price, An AOGCC witnessed suspended well inspection of Niakuk well NK-41A was conducted on 09/15/2019 (20 AAC 25.110 (h)). This recently submitted suspended well inspection reflects the current condition of the well (reference 20 AAC 25.110 (f)) and supports the request for renewal of suspension. Recent events from this well indicate that this well is mechanically sound. Specific attachments include: x Wellbore diagram illustrating the current configuration of the well x Suspended Well Site Inspection form documenting the pressures and site condition Niakuk well NK-41A was suspended on 11/02/1997. It is located on a pad with active wells and/or service wells. The strata through which the well was drilled is neither abnormally geopressured or depleted. The well is mechanically sound and secured with the top of cement at 9774’ in the 7-5/8” casing. Based on these conditions and the inspection on 09/15/2019 Niakuk well NK-41A meets the provisions required in 20 AAC 25.110 (a)(1). Hilcorp North Slope, LLC requests approval for renewal of the existing suspension status for this well. Attached is an Application for Sundry Approval (10-403) with a technical justification summarizing the information on the current status and condition of the well (reference 20 AAC 25.110 (a), (b), (e), (h)). In summary, Hilcorp believes Niakuk well NK-41A is mechanically sound and secure and meets the requirements for renewal of suspended status. If you have any questions, please call me at 907-777-8345 or Ryan Holt/ Andy Ogg at 659- 5102. Sincerely, Bo York PBE Operations Manager Digitally signed by Bo York DN: cn=Bo York, c=US, o=HIlcorp Alaska LLC, ou=Alaska North Slope, email=byork@hilcorp.com Date: 2020.08.21 10:06:40 -08'00' Bo York Attachments Technical Justification 2019 Suspended Well Site Inspection form Wellbore Schematic Niakuk Well NK-41A (PTD #197158) Technical Justification for Renewal of Suspended Status August 11, 2020 Well History and Status Niakuk well NK-41A (PTD #197158) was suspended on 11/02/1997 after losing 2354’ of drill pipe during a sidetrack attempt. Two cement plugs were placed in the open hole section and one plug was placed across the 9-5/8” casing shoe at 17661’ MD. The top of cement was tagged at 17015’ MD, above the kick off point at 17661’ MD. One joint of tubing was left below the tree. A back pressure valve was left below the tree. The well casing is mechanically sound as proven by a casing pressure test after the cement plugs were placed. The well will not allow the migration of fluids, will not damage freshwater or producing or potentially producing formations, will not impair the recovery of oil or gas, and is secure, safe and not a threat to public health. The strata through which the well was drilled is neither abnormally geo-pressured or depleted. Condition of the Wellhead and Surface Location Niakuk well NK-41A is located on an active, well maintained pad with clean gravel. The pit and surrounding area are in good condition. There is no discoloration and no sheens on the pad, pits, or in nearby water. The well pressure readings are T/I/O = -/400/0 psi. Request Hilcorp North Slope, LLC requests approval for renewal of the existing suspension status for NK-41A. A variance to the provisions of 20 AAC 25.110 (c) (2) is also requested under 20 AAC 25.112 (i) to allow the well to remain as suspended in its current condition. All hydrocarbon intervals are isolated and there are no underground sources of fresh water in this area. STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION REPORT OF SUNDRY WELL OPERATIONS RECEIVED nnr 4 r III I 1 /1114 1. Operations Performed Abandon ❑ Plug Perforations ❑ Fracture Stimulate ❑ Pull Tubing ❑ Opeptig0,s t ❑ Suspend ❑ Perforate E] Other Stimulate 11 Alter Casing ❑ C m ❑ Plug for Reddil ❑ Perforate New Pool ❑ Repair Well ❑ Re-enter Susp Well ❑ Other: Susend Inspection 0 2. Operator Name: BP Exploration (Alaska), Inc 4. Well Class Before Work Development 0 Exploratory ❑ 5. Permit to Drill Number: 197-156 3. Address: P.O. Box 196612 Anchorage, AK 99519-6612 1 Stratigraphic ❑ Service ❑ 6. API Number: 50-029-22778-01-00 7. Properly Designation (Lease Number): ADL 034630, 034635, 391381 8 390314 8. Well Name and Number: PBU NK -41A 9. Logs (List logs and submit electronic and printed data per 20AAC25.071): 10. Field/Pools: PRUDHOE BAY. NIAKUK OIL 11. Present Well Condition Summary: Total Depth: measured 23561 feet Plugs measured 17015, 18543, 22900 feet true vertical 10081 feet Junk measured 20148 feet Effective Depth: measured 16496 feet Packer measured None feet true vertical 7773 feet Packer true vertical feet Casing: Length: Size: MD: TVD: Burst: Collapse: Structural Conductor 80 20" 41-121 41-121 1530 520 Surface 7001 13-3/8" 41-7041 41-4925 5020 2260 Intermediate 17624 9-5/8" 38-17661 38-8123 6870 4760 Production Liner Perforation Depth: Measured depth: None feet True vertical depth: feet Tubing (size, grade, measured and true vertical depth) None Packers and SSSV (type, measured and None true vertical depth) 12. Stimulation or cement squeeze summary: Intervals treated (measured): Treatment descriptions including volumes used and final pressure: 13. Representative Daily Average Production or Injection Data Oil -Bbl Gas-Mcf Water -Bbl Casing Pressure Tubing Pressure Prior to well operation: Suspended Subsequent to operation: 14.Attachments(Mgwmdper20MC25.070,25.071,&25,255) 15. Well Class after work: Daily Report of Well Operations 0 Exploratory ❑ Development 0 Service ❑ Stratigraphic ❑ Copies of Logs and Surveys Run ❑ 16. Well Status after work: Oil ❑ Gas ❑ WDSPL ❑ Printed and Electronic Fracture Stimulation Data ❑ 1 GSTOR. ❑ WINJ ❑ WAG ❑ GINJ ❑ SUSP 0 SPLUG ❑ 17. I hereby certify that the foregoing is true and correct to the best of my knowledge. Sundry Number or N/A if C.O. Exempt: N/A Authorized Name: Lastufka, Joseph N Contact Name: Montgomery. Travis J Authorized Title: IM Spe l t Contact Email: Travis.Montgomery(dbp.com Authorized Signature: Date: Contact Phone: +1 907 564 4127 Form 10-404 Revised 04/2017 ' C„Zl_' ` /�(Q/��9 ,3BDMS1i�'0CT 212019 Submit Original Only T/I/O = 400/400/0. Torqued SSVxFC, No movement, Torqued FCx Blind flange, No movement. Replaced Jewelry on Blind flange. PT'd against MV 350/5000 PSI (Pass). 3/12/2019 RDMO. ***Job Complete***. FWPs = 400/400/0 T/I/O = SI/420/20. Temp = SI. Pre -inspection (compliance). No AL or flowline. No swab valve. Blind flange on top of FC. Well house clear of debris. No leaks or sheens noted. 9/10/2019 WV, MV = C. SSV = O. IA, OA = OTG. 11:40 T/I/O = SI/400/0. Temp = SI. AOGCC SU Inspection (Regulatory Compliance). State witnessed by Jeff Jones. Pictures taken. 9/15/2019 IWV, MV = C. SSV = O. IA, OA = OTG. 12:20 Suspended Well Site Inspection Form Initial Inspection Notify AOGCC Inspectors at least 10 days prior to inspection to allow witness Well Name: NK -41A Field/Pool: Prudhoe Bay / Prudhoe Oil Permit # (PTD): 1971580 API Number: 50-029-22778-01 Operator: BP EXPLORATION (ALASKA) INC Date Suspended: 11/2/1997 Surface Location: Section: 36 Twsp: 12N Range: 15E Nearest active pad or road: NK access road Take to Location Digital camera Map showing well location /Aerial photos Brief well history Wellbore diagram showing downhole condition Latest Sundry or Completion report Past Site Visit documentation Site clearance documentation Pressure gauges, fittings, tools Sample containers for fluids on or near pad Condition of Surface Location AOGCC requires: 1) a description of the condition of the surface location, including discoloration, fluids or sheens visible on the ground or in any nearby water, 2) photographs showing the condition of the location surrounding the well General location condition: r I•n n Pad or location surface: Location cleanup needed: NaA 9 - Pits condition: Surrounding area conditic Water/Fluids on pad: Discoloration, Sheens on Samples taken: None Access road condition: Photographs taken (# and Condition of Wellhead AOGCC requires: 1) a description of the condition of the wellhead, 2) well pressure readings, where practicable, 3) photographs showing the wellhead condition Wellhead/tree/valve description, condition: -r�1On Cellar description Rat Hole: Wellhouse or protective bs Well identification sign: Tubing Pressure (or casino Annulus pressures: Wellhead Photos taken (# Work Required: None fluids: _&0 Ce f fa r Operator Rep (name and signature): Josh Prowant AOGCC Inspector: • 1"tri Other Obseivers: No Inspection Date: 9/15/2019 AOGCC Notice Date: 9/13/2019 Time of arrival: 1 ¢gyp Time of Departure: Site access method: Access road WELL: NK -41A 0 WELL. W -20A 1:. w 0 , Flo. N O NII 14B LPJ A UK a5 _ N$ 45A 7 15A 36b NX XQSA81 J` NK 22A r t JMK�N I eW41 K 41PB2 '9i 21 J�Q r Al SD 05 1511;'{i �lt 28..... 256Ai•�57/:.... 151&'47'91 NX 23 213.VZ n NW( 25A 33 TRFF=. 7-1/1a"r:xx/.XF -FI ANrF WELLHEAD = 133/B" FMC ACTUATOR= BAKER OKB. ELEV = 60.1' BF. ELEV = 21.89 KOP = 2406' Max Angie = 11500' Dakin MD = 19806' Dalen TVD = 8800' SS 2' PUP OF 7" CSG, 26#, NSCC, ID = 6.276' SET IN TBG HGR 13-3/8" CSG, 68#, LA0, ID =12.415" 7041' 9-5/8" TD 23561' NK -41A SAFETY RTES: 70° @ 4900' SUSPENDED FRE EFE 8.5 ppg SEAWATER TAGGED TOP OF CMT, PLUG#3: 140 BBL "G" CMT @ 17.0 ppg, SETTING DEPTH 18453' 18543' ]TopoFcmTFLLjG#2: 140 BBL "G" CMT @ 17.0 ppg, SETTING DEPTH 19943' 20148' 1 FISH DRILLPPE- 2354' 11.5 ppg OBM ESTMATED TOP OF CMT, RUG #1: 51 BBL "G" CMT NWKUK UNIT WELL: NK -41A PERMIT No: 197-1580 API No: 50-029-22778-01 SEC 36, T12N, R15E, 479.02 FEL 4222.66 FNL DATE REV BY COMMENTS DATE REV BY I COMMENTS 11/03/97 SUSPENSION 10/08/19 DD/JMD JADDED OKB, BF 8 MINOR CHANGE 0122101 SIS491 CONVERTED TO CANVAS 0223/01 SIS -LG FINAL O V03/02 RN/TP CORRECTIONS 04/08/09 BG/SV CORRECTIONS BP Exploration (Alaska) Suspended Well Inspection Review Report InspectNo: sus11191009121803 Date Inspected: 9/15/2019 Inspector: Jeff Jones Type of Inspection: Subsequent Well Name: PRUDHOE BAY UN NIA NK -41A Date AOGCC Notified: 9/13/2019 Permit Number: 1971580 Operator: BP Exploration (Alaska) Inc. Suspension Approval: Completion Report Operator Rep: J. Prowant Suspension Date: 11/2/1997 Wellbore Diagram Avail? D Location Verified? ❑1 Photos Taken? ❑� If Verified, How? Other (specify in comments) Offshore? ❑O Well Pressures (psi): Tubing: IA: OA: Wellhead Condition Good, clean. Condition of Cellar No cellar. Surrounding Surface Condition Clean gravel, rain water on pad. Fluid in Cellar? ❑ 400 BPV Installed? ❑ 0 VR Plug(s) Installed? ❑ Comments Well location verified by pad & well identification signs. Supervisor Comments Photos(3)attached ✓ ��ID�Z1�l Monday, October 21, 2019 ja I n STATE OF ALASKA A KA OIL AND GAS CONSERVATION COMMON REPORT OF SUNDRY WELL OPERATIONS 1.Operations Abandon ❑ Plug Perforations Li Fracture Stimulate ❑ Pull Tubing LI Operations shutdown El Performed: Suspend El Perforate El Other Stimulate ❑ Alter Casing ❑ Change Approved Program ❑ Plug for Redrill ❑ Perforate New Pod❑ Repair Well ❑ Re-enter Susp Well ❑ Other Suspended Well Inspection Report IR,' 2.Operator 4.Well Class Before Work: 5.Permit to Drill Number: Name: BP Exploration(Alaska),Inc Development El Exploratory CI 197-158-0 3.Address: P.O.Box 196612 Stratigraphic ❑ Service❑ 6.API Number: Anchorage,AK 99519-6612 50-029-22778-01-00 7.Property Designation(Lease Number): 8.Well Name and Number: ADL0312827 NIA NK-41A 9.Logs(List logs and submit electronic and printed data per 20AAC25.071): 10.Field/Pool(s): t ' cn Niakuk Oil Pool � 11.Present Well Condition Summary: 2 ,. A 1 i, r 0;aj : Total Depth measured 23561 feet Plugs measured See Attachment feet _ .f Fc h ,.b'.i-N. true vertical 10081.3 _feet Junk measured 20148 feet a t t e C Effective Depth measured 16496 feet Packer measured None feet true vertical 7772.7 feet true vertical None feet Casing Length Size MD TVD Burst Collapse Structural None None None None None None Conductor 80 20"94#H-40 40.71 -120.71 40.71-120.71 1530 520 Surface 7000.79 13-3/8"68#L-80 40.21 -7041 40.21-4924.57 5020 2260 Intermediate 17622.79 9-5/8"47#L-80 38.21-17661 38.21-8123.18 6870 4760 Production None None None None None None Liner None None None None None None Perforation depth Measured depth None feet True Vertical depth None feet IcANNEE) NOV 1 2 2015 Tubing(size,grade,measured and true vertical depth) 7"26#L-80 36.21 -38.21 36.21 -38.21 Packers and SSSV(type,measured and true vertical depth) None None None Packer None None None SSSV 12.Stimulation or cement squeeze summary: Intervals treated(measured): Treatment descriptions including volumes used and final pressure: 13. Representative Daily Average Production or Injection Data Oil-Bbl Gas-Mcf Water-Bbl Casing Pressure Tubing Pressure Prior to well operation: 0 0 0 0 0 Subsequent to operation: 0 0 0 0 0 14.Attachments: 15.Well Class after work: Copies of Logs and Surveys Run ❑ Exploratory ❑ Development 0 Service ❑ Stratigraphic ❑ Daily Report of Well Operations 0 16.Well Status after work: Oil ❑ Gas ❑ WDSPL ❑ Printed and Electronic Fracture Stimulation Data ❑ GSTOR ❑ WINJ ❑ WAG ❑ GINJ ❑ SUSP CI SPLUG ❑ 17.I hereby certify that the foregoing is true and correct to the best of my knowledge. Sundry Number or N/A if C.O.Exempt: N/A Contact Garry Catron Email Garry.Catron a@BP.COm Printed Name Garry Catron Title PDC PE Signature ii/, ,�„ 0A2...__, Phone 564-4424 Date 8/6/2015 Q *L, 9/2/ 15 RBDMS3 AUG 1 4 2015 A f73//,----- Form 10-404 Revised 10/2012 Submit Original Only • e ciiC 4113 0 U) O ,C:n C (n O 2 N c Las U) O o 0 c N (a -o as ca _c I • O O 0 a) C 2 'Eh O L - TO � a Q L Q O O f _ § (0 d co 76 2 N E r _c co ..i r:-. Y O a O U) ▪ T- c t6 - O U N L_ Q N O 0U >+ 0 O 0 U Q) L 0 a) a) C 0 Q Q (a0 E c1• --- d (n C co U) 0 o_a 7 O o z 5 co > u U- O v) 2 o < u) 1 z 10 o (n N 76 N m v- • • Suspended Well Site Inspection Form 5 Year Notify AOGCC Inspectors at least 10 days prior to inspection to allow witness Well Name: PRUDHOE BAY UN NIA NK-41A Field/Pool: PRUDHOE BAY/NIAKUK OIL Permit#(PTD) 1971580 API Number: 50-029-22778-01 Operator: BP EXPLORATION (ALASKA) INC Date Suspended. 11/2/1997 Surface Location: Section: 36 Twsp: 12N Range: 15E Nearest active pad or road NIAKUK Pad Take to Location Digital camera Map showing well location/Aerial photos Brief well history Wellbore diagram showing downhole condition Latest Sundry or Completion report Past Site Visit documentation Site clearance documentation Pressure gauges, fittings, tools Sample containers for fluids on or near pad Condition of Surface Location AOGCC requires: 1)a description of the condition of the surface location, including discoloration, fluids or sheens visible on the ground or in any nearby water, 2) photographs showing the condition of the location surrounding the well General location condition: Good, active pad Pad or location surface: graded gravel Location cleanup needed. none Pits condition: N/A Surrounding area condition: clean Water/fluids on pad: none Discoloration, Sheens on pad, pits or water: none Samples taken: none Access road condition good Photographs taken (#and description): (4) Behind well and in front of house Condition of Wellhead AOGCC requires: 1) a description of the condition of the wellhead, 2)well pressure readings. where practicable, 3) photographs showing the wellhead condition Wellhead/tree/valve description, condition FMC wellhead, CIW tree, clean and functional Cellar description, condition, fluids: back filled with gravel, clean and dry Rat Hole: N/A Wellhouse or protective barriers: Yes, well house Well identification sign: yes. correct Tubing Pressure (or casing if no tubing): None Annulus pressures: IA=370 psi, 0A=0 psi Wellhead Photos taken (#and description): (4)wellhead and tree Work Required: None Operator Rep (name and signature). Whitney Pettus ,0" L / AOGCC Inspector: Matt Herrera Other O•sc _ - Ryan Hayes Inspection Date 7/12/2015 AOGCC Notice Date: 7/8/2015 Time of arrival: 10:30 AM Time of Departure: 10:40 AM Site access method: truck o 6. n LI y ^, O co V = _ L. _ O� m En _ m O :7 -' ''. x :� L s LF J a a `y fix.. a a 76 o vi LiD c7 41 0 ..r--7.- E r•-.A •.w n O _ ,J d0 CJ 4-4N Lii C4 a W N 47 N cO C1 fl N Q Y 2 a A m } w O m M 7 Y a CJ O .. m Yn- a Z z 7 a +,.` YO 7.ni")dSI'3-..... + .a a O 9 U c aN 1. Y m Z q.. a c N a M k cu Y., c m cu m d d a Q O N m O Y N g. -o a. fi Z Y c ,l 2 9_ Z�� 12 m o CO C m c m� z -m Y'; o Z �y Z i A C. E ac '42 m c E y U fV m N� _ 2 aa r \ „, Y Y .N 2 C 2 G m 2 mm U c d Z i I a < a 0 s < 9 a a rj 0 ,,° Y 4,Z N2 .� :.y Y n Z tO Ln Cr, ,.Z p� w OY 7.4p-1,2 O 4�O.Nm m Z a �r2 ' 1 440, , zi. , z M EhJtri. ' �f7 t h G a Y ~ Y YI'S ,, -.If 1 0 0 ;''-, CO O. /4".:lie It is- fa u tn • §id ."` � pa sr t � ' t " `'^ "'gal. s i }. j p+.r ,,,. "L,,8, ,,,, *A, fft: 1 *, ',.„:7: tt''' *.-"*--f,'14:''''',:ii.,::'''::',:"'.:7$:-',',.*:441;;!** r', 0 f,+ s fit - 0 y. a . fi v;.: r �",yp is r y_x. as "' M1 }t§ i Ai 4 OWNER NK-41A ' rt 11, OPERATOR Prudhoe Bay Unit API NUMBER BP Exploration(Alaska) "`:::::... ; { 50-029 )Inc. SUR.LOCATION 22778-01-00 ¢ l''O'' y ,, DRILLING SE 1,4,Sec.36,T1 B PERMIT 197-158 RISE 4 i r x i, s °` . x i tt ,, 1 y� �� (�� >+ aIlk c 1 r sn zdY4,,e,„^- . ,,43/4",:: , i g a .� .',.,:-..,•:;.•::•,-;au' e, --,„,,,-*A • 4Yb�+ .,r+° .3ttf cE �s. ` k;:• y € ! `fir '1411 ,, �y yl�cl biz' , jk ,,,,,k 1,,, , , ,44.t.0",,,,t 1iflig),''', t ,,, . to, ,,,;4‘k ,°,: .016.4 ,,,,vvy.;,4 � % 1' 4z '`; '{+ ,'„','411,,,,.4.44'?'‘",:ki 4.'4,*P. `fi ` �( tJ4(� :44'1' � ,e , • # ‘ �t��U LcM 1)1, ��! S 1t t. t 4',44V ,'n';. *.*.:*iils ** 'q1.1V ' .e"'AI#1.' '*'; Vt.' t — 4 a .. 1 •1:''''''';',.,1*,•'-',\:4'...`,,,S. *.t4A.•-.,1„''' i41,8 , .i. 11-,''',..",4; ' '''.4).,.'-a- . .1.v, . ,,,4* *44. *' V., .41`,41, r 4 4 ... ,...,.,. -4.1`t.,.*,,t74,,-.., ri:i.,'.*''*fli;t1VAti**/44.et . l't:* ,.::;'k'..' ' :71 / '' , ...7 �,� 4 w` 1 �♦ ♦ti�,a 7 • r" t {jR ' ' �;• ' i >tt� f � Sty �i iy. �. � ' ♦♦ s1 ,, 1 I♦�f� t to 1' ? , 1 1 ; b t�� tom \ ''.."..•.:‘;‘, _fir r a 1 Nt.. V !.♦aa\4, t1 "`ty "4. ' "yam y t 1+e7^ +=mow �. •-•,,`-'1' :,1:1,�ql S S' '1,5S' a �. �rl� '',..1,1". ' gyp,• ,p T.:�6 to... li, >r`, u vx+t 4',, > k ,i 1". yl,'''S :Citi u v Kis ;4:(.1,-,„0_,;—,,: �k �4 v , *i*/' y1Q .# ,'41.,'",...„,:::-'11k-`,..:' �R :k` .,',..',".:::':41i;..) Y 1 is a' ' �-':. ...".'"`"-�.......,_..... C fi { t,`= *Pmmp ia, 1 ,•\' ,+1t !•"i . + as ) fi , 0.i?$ ' SL 3 1 � -..;:-.!..,1•:.'0'i,� y�yq��{+� "il1 j �+Y " d ° ;-: ' 1,3 - ' • k— ';'', '''',.,.',:',..!;""tt,,1",,nii7-it4''',;,—..:-k,,titt,:„;.';,!;Y,',';',";,-.';'`,3"'''''''" r ttf' � Ian +d{. �. �' - ! 3x x : ` • re cU�, f t i � '` f a :•'':',.,i,' . r 5k `Ear ! , j Y t11 . GGGppp !!77 '.. ( v • ' ' ' A v J' a f -.. . "� ' ::,-,;'-'-,.'''''... ..:44,' , yy -.. . ..,..,. .„,,,...,,.0._. . . r 4b P , .f.�, '„,,:e4 {I ° ' � I ! .+p +t& � �a; - 4 - { - L'y .' 4s.aaX 44 * " �1� ! :+ '''`.,,,„:1"%:;;";...2:;,..'', 4�''' °�w iA0}2.5f -,:,,,,,-,;,,.,,..(..;,:---,71--,,;, �� r' ri a.+'ifes - 1', yip,,,z ..- ''. * ,.r -,1,---,,,,,,,,'-'1‘...:,'.-,....,,,E,„;;,-...1 l j � ., 1v '' yki�:r 4Wf4 �•* z $ `r], r1 ,te � r SS ,`I„ .,'4.,..",:;4",,,' 7, Qµ 4r #t ` d :t `v j 4 l , {sly o 9 L. '','.';'14,:`,‘4',.. ' ,i 1'1, i ' II t,}` ' s i X 'Ix4i' n .Y;_ • S ` * o u` •i ‘ 0.v. • , ik (-7t(' � '4\'' u . , _i' ` a" Lf • t7i r ' ,d 4 : •$ • • , , , , . f .*- 4,'‘i'f',' /, • fi 5 - ,W�• 3_ i° )•fir a; e ,` • �,t Pz� .. ", •-a t, �� ,�' t �I: ' l ' yh,x iti � ', A p .•:!k`!::;'•;...;j 4 �r!t}}r�,,' ` rTM I e I 43 • • '.';',:.,!..'t d s;st I �Q] 3) .`� 1 'f `.1 ta,, t ; • • M15a a4 ,is ;. • • .„ .•:„ � v 1 )r '1' , , I -• ca a � �} 1ht c i , ,.1 > ':4 , : iiJ et ,-I. � { i, , � .ey},, ry� a .Od'.tc° .�g4 • • 11.; ur 1,... �. . � .'� � � X1.1 � • f1'"� It{ 144 h ,' S aka .ti a 4 'L` i I +h> ��� 'Y • �� = tt ra �^� i ,'",`•1'''',,' � ..k11. 7 yam ; ' . ,•41;,,,:i. of 8 y t ,...,:,!.i.:,..-1.,!, :tM c` t At '''.'.'1,10!",', "b1� � :..i..., 'v;r t t r• se's � { 1 , "� t'i .1 -,1.t r 1 R{ },7 4-'1 j +r�•. $ w1N 4 f�r f +kY S r mal �i -.. ili /'l ';':'41V.41`4,ti x C i. k 4 r ¢ T �L " *i fw�ty`�` �h,. f '. r baa ,t r.. .�'". t 1 411 } . V . F.= t as t + v & ( i , '„..,."':i. � �i 3 ' u, 1' i G r -,•.,..,•••• i f , • .., • c h. � . ;.2i..•4 � t � � '1.?. `t1 d `i )•' ..,:.,., .• , {°} ,'' r }fit } fit :n .} ) •' y 1 1 1 h!4''''' ,,, tt?xi� ••,'-'" ..,,.rhJ9 j. ..'I'.-•:,".,`'.4,, ',.',„•, 1 i t • ;41-1•13' t ' ..,.#� R �x �d 4t ,' i ',,••:,,' t ? v �f. 1 t +� ' - t i i ,,,','„1!...'-'..*'-� .} \� i Bt �t 4 } ;F is � x \ y x ' • t � `. ¢ �� .3 ' � � � �t i�4�itti'l''''-';*:', t r�• / ' \ � r1� :' ` 0• c ` •1 f t 4 f ; 1 ,� I` 4 .`7 ¢S t i •• I: • t;.;:;;;.441::'''::'.: t 4 �3 R > if / + , t + —'''\'"''' L, ' r R , t } � itd.14 pl gt �j ,fib '•SfY t7{j , " ',;,,i,.,..:.::.::::-;.,4%%::.:::,' 5 y + t ; } i:t i , `i iY � �1 .; a I ii fY S { t 4 �} • f "x " i }t1 '1 4r ". } : „ ; 1 • : • t,s tt ,11",',1',"•••".,.-..., �a � X S.x �, 4 • . 0 .„..:,,,,.:::::...H','.‘„ ..."...,",,12,;;;.....,:;-...::: ?} e �r . ' f t t ,. e..'} Y �,e , � • '--,'- .„,,-4 i{ + t z � „� • y +�xt � �t t ,� ° t r.; ) 'r' ,t' ra } q� a ) t ;ti >s , } x I; _ .1:1,),,:,,,,,:;,,!.:1;;'! s $}�x•�1 Ort t ,. � t.41' 1 t at' a ,•I' c. ' i �y "' 9 } :. r' , j ,;,:,..,,,:',z,::t l�$ s' r Y-� - tr a }" I 5 ' • -;,„,'','F',, ,'`+,a� +s {it �' r ." is) f)tr r 0_, x„ .f At 7x ,,,,,,,..,7e,,:.:14 �. �1 d� f +r: � r`.t 3i,.i. 4 • } �� f .. ' , „ 4•';,, ,...':,'1',„•/..::•!•'''• .,1 li 1 „ ,.'''',;.-.`!.;.',1,—”' i pvt tt(l!; +, >3 r• s, .r �; SP ixt r xF f rr� 1}"t j t. 1 la,, 9 t+ x !� h t+,�t 1} tx �' t c�,' ql3, • } t i;,_• ani • :is yah },' i h} •�,' -1 I • v� a a ;r 7i fi , yt,. 4:‘,',''.-;•,:''r;',";;';;;‘.:.);.''''. e . �i p�}Y,j i '' • , a ,.,;) • ,,'.'.•it , f +A.��t t+1 P {1 1' ek r t1 },a { ,' dry' } V . x .r B �.# ,�., ' '4, •. tc ' la Si. It} i,.a+ x :; ' „,,,,,•;.:.'..,11:4„,,,2.1.',,,,,";`,•(• � } t 1. C' r� !' r�}f t 't I 1 ' 7” ,,' e t 0 it ,, t -r x b ' "7 ��. _ a +i • r , r "JIM IIIIP 1111 s, .. 4 . f :. 3 '.tL' i : aC n y -h +t.'a., ' 4. ' a i. �44 w .t 4 J � ti i ... *b ' iw t fir'. �,"- < °,, ', � It, t 3 r ' i z /. { f . • iI d a t r°* 1r aP ,..*. • ,...4, -, , Te • ;*w.;. • ''..11t44°. w W 4 2 " a* 9 a, 4 ,: a n **041 n • Ok' :III M 3 r , + .t f { N ' ' ---4,,-, , .41,, x ♦ N , '`i � ,tom ���, �, r 0 . �1 "moi J" d ,..,0'...-7t....•• y' )' 'sS r ,,.- f �� 1,, `. 1111 ...: 35 �, Ufa �1 11 '' t ' s . < $„ '€ s r- ,' .; "' ...,,wa'^'T x.X11 '' h'. i • .;,,,,ill .. ,1..i.ir,.:ii..7..,3i,7 t".••' --••e ''- 1 1: l'I i sQ 3e,`�1 itpQ�'Fm, .± T W ' � 1��,( Y' r <; .� , .. « i owe - ,^ ` « .l'4:1414'41.*' al: qq�� ,i „ r-iiii __ .. . ,,,,,,, :a _ mAr ws t ----- moor • )- • is "j' '" Asx s 1 IMMO : _._ . r 3 n • TREE= 7-1/16"CIW w/FMC FLANGE• WELLHEAD= 13-5/8"FMC NI K-41 A SAFETY NOTES: 70°@ 4900' ACTUATOR= BAKER KB. ELEV = 40.7' BF.ELEV= 39.7' KOP= 2406 2200' — FREEZE PROTECTION,(DIESEL) Max Angle= 11500' Datum MD= 19806' Y/f Datum TVD= 8800'SS 2'PUP OF 7"CSG,264,NSCC. ID=6.276" ? SET IN TBG HGR 8.5 ppg SEAWATER 13-3/8"CSG,684, L-80, ID= 12.415" —I 7041' 13-3/8"CSG MILLOUT WINDOW(NK-41A): 17015' —TAGGED TOP OF CMT,PLUG#3: 140 BBL"G"CMT @ 17.0 ppg, SETTING DEPTH 18453' 9-5/8"CSG.47#, L-80, ID=8.681" — 176614 I-41 18543' —TOP OF CMT, PLUG#2: .......... .......... 140 BBL"G"CMT @ 17.0 ppg, .......... .......... SETTING DEPTH 19943' .......... 00000 0.0.00 1.11.1**0 .10000 010010 .00001 .......... 00000 20148' —FISH DRILLPIPE-2354' 11.5 ppg OBM (BTM @ 22502') 22900' —ESTIMATED TOP ..avavAvAwAvAvrAvA. VIWOWIWO OF CMT. PLUG#1: •••••••••• ***......1 51 BBL"G"CMT 00..00 .......... @ 15,8 ppg .000.0 .......... 00400. .......... TD —I 23561' A•444/4414 DATE REV BY COMMENTS DATE REV BY COMMENTS NIAKUK UNIT 11/03/97 SUSPENSION WELL' NK-41A 01/22/01 SIS-Isl CONVERTED TO CANVAS PERMIT No: 197-1580 02/23/01 SIS-LG FINAL API No: 50-029-22778-01 01/03/02 RN/TP CORRECTIONS SEC 36,T12N, R15E,479.02 FEL 4222.66 FNL 04/08/09 BG/SV CORRECTIONS BP Exploration (Alaska) STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION Suspended Well Inspection Report Date Inspected: 07/12/15 Inspector: Matt Herrera Operator: BP EXPLORATION AK Well Name: PBU NK-41A Oper.Rep: Ryan Hayes PTD No.: 1971580 Oper.Phone: 907-659-5766 Location Verified? Yes Oper.Email: rvan.haves@bp.com If Verified, How? LAT/LONG Onshore/Offshore: Onshore Suspension Date: 11/02/97 Date AOGCC Notified: 07/08/15 - Sundry No.: Well Completion Report Type of Inspection: Subsequent Wellbore Diagram Avail.? Yes Well Pressures(psi): Tubing N/A - Photos Taken? Yes IA 370 OA 0 SCANNED Ari , 1 9 2015 Condition of Wellhead: Good,Gauges operable Condition of Surrounding Surface Location: Good no standing water or oil sheen discoloration around well house or in cellar area - Follow Up Actions Needed: Monitor IA and OA pressure and visually inspection by Operator Comments: SSV was closed. Attachments: Photos(3) / REVIEWED BY: Insp.Supry �7!L(3413- Comm PLB 12/2014 2015-0712_Suspend_PBU_NK-41A_mh.xlsx Suspended Well Inspection— PBU NK-41A PTD 1971580 Photos by AOGCC Inspector M. Herrera 7/12/2015 WELL: OWNER Prudhoe Bay Unit OPERATOR BP Exploration (Alaska) Inc. 4PI NUMBER 50-029-22778-01-00 5UR. LOCATION SE 1/4, Sec. 36, T12N, R15E MILLING PERMIT 197-158 • 1 t . a s •. 4 1ST a,„I r • t x . mg. VA - -. 2015-0712_Suspend_PBU_NK-41 A photos_mh.docx Page 1 of 2 t .4:-...*•te,,,--.'.,.0' . t • i • \;3- Y ,-y, .. it F+ 1,', irk • i dv i i z w. .J 2015-0712_Suspend_PBU_NK-41 A_photos_mh.docx Page 2 of 2 XHVZE Pages NOT Scanned in this Well History File This page identifies those items that were not scanned during the initial scanning Project. They are available in the original file and viewable by direct inspection. PAGES TO DELETE Complete RESCAN Color items - Pages: GraYScale, halftones, pictures, graphs, charts- Pages: ~ ~ Poor Quality Original'- Pages: [] Other - Pages: DIGITAL DATA Diskettes, No. n Other, No/Type 'OVERSIZED Logs of various kinds Other COMMENTS: n Scanned TO RE-SCAN Notes: Nathan Lowell ·., IRe-Scanned by: ~vedy Mildred Daretha Nathan Lowell Date: /si • • STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION Suspended Well Inspection Report Date Inspected: 08/21/10 Inspector: Chuck Scheve Operator: BPX Well Name: PBU NK -41A Oper. Rep: Ryan Holt PTD No.: 1971580 - Oper. Phone: 659 -5766 Location Verified? No Oper. Email: If Verified, How? Onshore / Offshore: Onshore • Suspension Date: 11/02/97 ✓ Date AOGCC Notified: Sundry No.: Type of Inspection: Wellbore Diagram Avail.? No Well Pressures (psi): Tubing 0 Photos Taken? Yes IA 420 / by operator OA 0 Condition of Wellhead: Wellhouse in place, full tree with good access in place. Flow line removed and blinded. Condition of Surrounding Surface Good Location: Follow Up Actions Wood blocks, insulation blankets, empty drum and other debris in wellhouse needs to be removed. Needed: Attachments: REVIEWED BY: c .) Insp. Supry 7' ijtOl,o Comm PLB 08/2010 Suspended Well PBU NK -41A 8 -21 -10 CS.xls • • BP Exploration (Alaska) Inc. Attn: Well Integrity Coordinator, PRB -20 Post Office Box 196612 Anchorage, Alaska 99519 -6612 7-°1 July 6, 2011 5 Mr. Tom Maunder M � , Alaska Oil and Gas Conservation Commission , 333 West 7 Avenue Anchorage, Alaska 99501 Subject: Corrosion Inhibitor Treatments of GPMA Niakuk Dear Mr. Maunder, Enclosed please find multiple copies of a spreadsheet with a list of wells from GPMA Niakuk that were treated with corrosion inhibitor in the surface casing by conductor annulus. The corrosion inhibitor is engineered to prevent water from entering the annular space and causing external corrosion that could result in a surface casing leak to atmosphere. The attached spreadsheet represents the well name, API and PTD numbers, top of cement depth prior to filling and volumes of corrosion inhibitor used in each conductor. As per previous agreement with the AOGCC, this letter and spreadsheet serve as notification that the treatments took place and meet the requirements of form 10 -404, Report of Sundry Operations. If you require any additional information, please contact me or my alternate, Mehreen Vazir, at 659 -5102. Sincerely, Gerald Murphy BPXA, Well Integrity Coordinator • • BP Exploration (Alaska) Inc. Surface Casing by Conductor Annulus Cement, Corrosion inhibitor, Sealant Top-off Report of Sundry Operations (10 -404) Niakuk Date: 05/15/11 Corrosion Initial top of Vol. of cement Final top of Cement top off Corrosion inhibitor/ Well Name PTD # API # cement pumped cement date inhibitor sealant date ft bbls ft na gal NK -01A 1780280 500292015801 P&A 3/9/91 NA NA NA NA NA NK -02A 1780790 500292018001 P&A 3/13/91 NA NA NA NA NA NK -03 1780940 500292035000 P&A 4/14/80 NA NA NA NA NA NK-04 1842000 500292121700 P&A 4/14/96 NA NA NA NA NA NK -05 1850270 500292129000 P&A 4/15/98 NA NA NA NA NA NK-06 1862760 500292148600 P&A 4/15/96 NA NA NA NA NA NK -07A 2010630 500292241001 0.2 NA 0.2 NA 0.9 4/30/2011 NK-08A 2010290 500292249101 0.2 NA 0.2 NA 0.9 4/30/2011 NK-09 1941400 500292251800 2.1 NA 2.1 NA 17.0 4/30/2011 NK -10 1931840 500292242500 1.5 NA 1.5 NA 11.9 4/30/2011 NK -11A 2020020 500292278901 1.5 NA 1.5 NA 11.9 4/30/2011 NK -12C 2030650 600292241403 1.8 NA 1.8 NA 31.0 4/30/2011 NK -13 1961340 500292289300 2.3 NA 2.3 NA 22.1 5/4/2011 NK -14A 2080310 500292286801 1.8 NA 1.8 NA 17.0 5/4/2011 NK -15 1970320 500292274500 1.8 NA 1.8 NA 18.7 5/4/2011 NK -18 1940220 500292244700 2.5 NA 2.5 NA 20.4 5/4/2011 NK -17 1981850 500292270900 3 NA 3 NA 20.4 5/4/2011 NK -18 1931770 500292242100 2 NA 2 NA 17.0 5/8/2011 NK -19A 2010700 500292250701 1.8 NA 1.8 NA 15.3 5/6/2011 NK -20A 2050400 500292242901 2.1 NA 2.1 NA 13.6 5/9/2011 NK -21 1940880 500292248700 2 NA 2 NA 22.1 5/15/2011 NK -22A 2012280 500292240201 1.5 NA 1.5 NA 11.9 5/11/2011 NK -23 1940350 500292245500 3.6 NA 3.6 NA 20.4 5/10/2011 NK -25 1970680 600292278000 2.5 NA 2.5 NA 15.3 5/11/2011 NK -28 1940050 500292244000 2.9 NA 2.9 NA 17.0 5/11/2011 NK -27 1950210 500292254700 2.3 NA 2.3 NA 13.6 4/30/2011 r.> NK -28 1980930 500292267800 Sealed Conductor NA Sealed Conductor NA NA NA NK -29 1981900 500292272400 1.7 NA 1.7 NA 10.2 4/30/2011 NK-38A 2042410 500292254001 3.1 NA 3.1 NA 13.6 5/8/2011 NK-41A 1971580 600292277801 9.1 NA 9.1 NA 54.0 5/9/2011 NK-42 1941080 500292249900 2 NA 2 NA 13.6 5/9/2011 NK-43 2010010 500292299800 1 NA 1 NA 5.1 5/9/2011 NK-61A 2080350 500292289301 14 NA 14 NA 110.5 6/15/2011 NK -82A 2030470 500292285201 1.3 NA 1.3 NA 13.6 5/4/2011 NK-65A 2050830 500292288901 1 NA 1 NA 8.5 5/6/2011 a� A 1ASKA SEAN PARNELL, GOVERNOR ALA OIL A" GAS 333 W. 7th AVENUE, SUITE 100 CONSERVATION COMMISSION ANCHORAGE, ALASKA 99501 -3539 PHONE (907) 279 -1433 j FAX (907) 276 -7542 Gary Preble Data Management Engineer BP Exploration (Alaska), Inc. i P.O. Box 196612 �J.. I Anchorage, AK 99519 -6612 / Re: Prudhoe Bay Field, Niakuk Pool, NK -41A Sundry Number: 310 -280 Dear Mr. Preble: NGV 4 2010 Enclosed is the approved Application for Sundry Approval relating to the above referenced well. Please note the conditions of approval set out in the enclosed form. As provided in AS 31.05.080, within 20 days after written notice of this decision, or such further time as the Commission grants for good cause shown, a person affected by it may file with the Commission an application for reconsideration. A request for reconsideration is considered timely if it is received by 4:30 PM on the 23rd day following the date of this letter, or the next working day if the 23rd day falls on a holiday or weekend. Sincerely, ' Daniel T. Seamount, Jr. Chair hi DATED this Z day of November, 2010. Encl. by BP Exploration (Alaska) Inc. Attn: Well Integrity Coordinator, PRB -20 Post Office Box 196612 Anchorage, Alaska 99519 -6612 0 September 1, 2010 Mr. Daniel Seamount, Chairman lli? Alaska Oil and Gas Conservation Commission 333 West 7 Avenue .r a ssioR Anchorage, Alaska 99501 1,3�t Subject: Niakuk Well NK -41A (PTD #1971580) Suspended Well Inspection Report (10 -404) Application for Renewal of Existing Suspension (10 -403) Dear Mr. Seamount, BP Exploration (Alaska) Inc. (BPXA) completed an AOGCC witnessed suspended well inspection of Niakuk well NK -41A on 8/21/10. Enclosed is a Report of Sundry Well Operations (10 -404) with attachments documenting the inspection and the current condition of the well (reference 20 AAC 25.110 (e) and (f)). We believe this information demonstrates that the well is mechanically sound. Specific attachments include: • Suspended Well Site Inspection form documenting the well pressures and site condition, witnessed by an AOGCC inspector • Wellbore diagram illustrating the current configuration of the well • Pad map and aerial photo showing well location and other wells within one - quarter mile radius of the surface location • Photographs showing the condition of the wellhead and the surrounding location Niakuk well NK -41A was suspended on 11/02/97. It is located on a pad with active producing wells and /or service wells. Based on this information, BPXA requests approval for renewal of the existing suspension status for this well. Attached is an Application for Sundry Approval (10- 403) with a technical justification summarizing the information on the current status and condition of the well (reference 20 AAC 25.110 (a), (b), (e), (h) and (i)). In summary, BPXA believes Niakuk well NK -41A is mechanically sound and secure and meets requirements for renewal of suspended status. If you require any additional information, please contact me at 564 -5637, Torin Roschinger /Jerry Murphy at 659 -5102 or Chris Stone 564 -5518. Sincerely, / ji-- 'Y - R. Steven Rossberg BPXA, Wells Operations Manager Attachments: Report of Sundry Operations (Form 10 -404) with attachments: Suspended Well Site Inspection form Wellbore Schematic Well location plat and aerial photo Pictures of wellhead and location Application for Sundry Approval (Form 10 -403) with attachment: Technical Justification Cc: Roschinger /Murphy Harry Engel Mike Bill Chris Stone Bob Gerik Gary Preble STATE OF ALASKA q �/ 0 9 -ate ALASKOL AND GAS CONSERVATION COMMISSIO 11.Z' APPLICATION FOR SUNDRY APPROVALS QX 20 AAC 25.280 1. Type of Request: Abandon ❑ Plug for Redrill ❑ Perforate New Pool ❑ Repair Well ❑ Change Approved Program ❑ Suspend ❑ Plug Perforations ❑ Perforate❑ Pull Tubing ❑ Time Extension ❑ Operation Shutdown ❑ Re -enter Susp. Well ❑ Stimulate❑ Alter Casing ❑ Other: RENEW SUSPENSION ' 0 2. Operator Name: 4. Current Well Class: 5. Permit to Drill Number: BP Exploration (Alaska), Inc. Development Q Exploratory ❑ 197 -1580 3. Address: P.O. Box 196612 Stratigraphic ❑ Service ❑ 6. API Number: Anchorage, AK 99519 -6612 50- 029 - 22778 -01 -00 - 7. If perforating, closest approach in pool(s) opened by this operation to nearest 8. Well Name and Number: property line where ownership or landownership changes: Spacing Exception Required? Yes F-1 No NK -41A 9. Property Designation (Lease Number): 10. Field / Pool(s): ADLO - 312827 PRUDHOE BAY Field / NIAKUK Pool 11, PRESENT WELL CONDITION SUMMARY Total Depth MD (ft): Total Depth TVD (ft): Effective Depth MD (ft): Effective Depth TVD (ft): Plugs (measured): Junk (measured): 23561 10081.3- 16496 7773 17015' 22900' TOC 20148' Casing Length Size MD TVD Burst Collapse Structural Conductor 115 20" 94# H -40 43 115 43 115 1530 520 Surface 7041 13 -3/8" 68# L -80 41 7041 41 4925 4930 2270 Intermediate 17661 9 -5/8" 47# L -80 38 17661 1 38 8123 6870 4760 Production Liner Perforation Depth MD (ft): Perforation Depth TVD (ft): Tubing Size: Tubing Grade: Tubing MD (ft): NONE- - NONE Packers and SSSV TvDe: NONE Packers and SSSV MD and TVD (ft): 12. Attachments: Description Summary of Proposal ❑ 13. Well Class after proposed work: Detailed Operations Program ❑ BOP Sketch ❑ Exploratory ❑ Development Q- Service ❑ 14. Estimated Date for 15. Well Status after proposed work: Commencing Operations: 9/15/2010 Oil ❑ Gas ❑ WDSPL ❑ Suspended 16. Verbal Approval: Date: WINJ ❑ GINJ ❑ WAG ❑ Abandoned ❑ Commission Representative: GSTOR ❑ SPLUG ❑ 17. 1 hereby certify that the foregoing is true and correct to the best of my knowledge. Contact Gary Preble Printed Name Gai Preble Title Data Management Engineer Signature Phone Date 564 -4944 9/1/2010 Prepared by Gary Preble 564 -4944 COMMISSION USE ONLY l Conditions of approval: Notify Commission so that a representative may witness Sundry Number: Plug Integrity ❑ BOP Test ❑ Mechanical Integrity Test ❑ Location Clearance ❑ RROEkVED Other: -J CL ro U11fi r 20,4,q.C- 1($.S) f) Subsequent Form Required: � r 9i:r 07 APPROVED BY D Approved by: 11/ COMMISSIONER THE COMMISSION Date: bM N o v o a o OR IGINAL - z -� Form 10-403 Revised 1/2010 Sub in D uplicate R Skuk Oil Pool well NK -41A • Technical Justification for Application for Renewal of Suspension Status September 1, 2010 Well Status Niakuk well NK -41A (PTD # 1971580) was suspended on 11/02/97 after losing 2354' of drill pipe during a sidetrack attempt. Two cement plugs were placed in the open hole section and one plug was placed across the 9 -5/8" casing shoe at 17661' MD. The top of cement was tagged at 17015' MD, above the kick off point at 17661' MD. One joint of tubing was left below the tree. A back pressure valve was left below the tree. The well casing is mechanically sound as proven by a casing pressure test after the cement plugs were placed. The well will not allow the migration of fluids, will not V damage freshwater or producing or potentially producing formations, will not impair the recovery of oil or gas, and is secure, safe, and not a threat to public health. The strata through which the well was drilled is neither abnormally geo- pressured or depleted. Condition of the Wellhead and Surface Location Niakuk well NK -41A is located on an active, well maintained pad with clean gravel. The pit and surrounding area are in good condition. There is no discoloration and no sheens on the pad, pits, or in nearby water. During the inspection, it was dis the we ll a s ign was miss ing. Anew sign has been ordered and will be placed at the well. The well pressure readings are T /I /O = NA/420/0. T 6tJ Request /7al �P sf - BPXA requests approval for renewal of the existing suspension status for NK -41A. 10- 2-7-Ai A variance to the provisions of 20 AAC 25.110 (c) (2) is also requested under 20 AAC 25.112 (i) to allow the well to be remain suspended in its current condition. All hydrocarbon intervals are isolated and there are no underground sources of fresh water in this area. ANk TREE 7 -1/16" CIW w /FMC FLANGE WELLHEAD = 13 -5/8" FMC NK-41A I NOTES: 70° @ 4900' ACTUATOR = BAKER KB. R EV = 40.7' BF. ELEV = 39.7' KOP 2406' 2200' FREEZE PROTECTION, (DIESEL) Max Angle = 11500' Datum MD = 19806' Datum TV = 8800' SS 2' PUP OF 7" CSG, 26 #, NSCC, ID = 6.276" ? SET IN TBG HGR 8.5 PP9 SEAWATER 13 -3/8" CSG, 68 #, L -80, ID = 12.415" 7041' 13 -3/8 CSG MILLOUT WINDOW (NK -41A): 17015' TAGGED TOP OF CMT, PLUG #3: 140 BBL "G" CMT @ 17.0 ppg, SETTING DEPTH 18453' 9 -5/8" CSG, 47 #, L -80, ID = 8.681" 17661' 18543' TOP OF CMT, PLUG #2: 140 BBL "G" CMT @ 17.0 ppg, SETTING DEPTH 19943' 20148' FISH DRILLPIPE - 2354' 11.5 ppg OBM (BTM @ 22502') 22900' ESTIMATED TOP OF CMT, PLUG #1: 51 BBL "G" CMT @ 15.8 PP9 23561' DATE REV BY COMMENTS DATE REV BY COMMENTS NIAKUK UNIT 11/03/97 SUSPENSION WELL: NK -41A 01/22/01 SIS -Isl CONVERTED TO CANVAS PERMIT No: 197 -1580 02/23/01 SIS -LG FINAL API No: 50- 029 - 22778 -01 01/03/02 RN/TP CORRECTIONS SEC 36, T1 2N, RI 5E, 479.02 FEL 4222.66 FNL 04/08/09 BG /SV I CORRECTIONS BP Exploration (Alaska) STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSM REPORT OF SUNDRY WELL OPERATIONS 1. Operations Abandon ❑ Repair Well ❑ Plug Perforations ❑ Stimulate ❑ Other Q INSPECT Performed: Alter Casing ❑ Pull Tubing ❑ Perforate New Pool ❑ Waiver F] Time Extension ❑ WELL Change Approved Program ❑ Operat. Shutdown ❑ Perforate ❑ Re -enter Suspended Well ❑ 2. Operator BP Exploration (Alaska), Inc. 4. Well Class Before Work: 5. Permit to Dril�Number: Name: Development ❑� Exploratory ❑ 197 -1580 3. Address: P.O. Box 196612 Stratigraphic❑ Service ❑ 6. API N mber: Anchorage, AK 99519 -6612 I, 50- 029 - 22778 -01 -00 8. Property Designation (Lease Number) : 1 9. Well Name and Number: ADLO- 312827 NK 41A 10. Field /Pool(s): PRUDHOE BAY FIELD / NIAKUK POOL 11. Present Well Condition Summary: Total Depth measured 23561 feet Plugs (measured) 17015' TO C feet 22900' TOC true vertical 10081.3 feet Junk (measured) 20148' feet Effective Depth measured 16496 feet Packer (measured) true vertical 7773 feet (true vertical) Casing Length Size MD TVD Burst Collapse Structural Conductor 115 20" 94# H-40 43 - 115 43 - 115 1530 520 Surface 7041 13 -3/8" 68# L -80 41 - 7041 41 - 4925 4930 2270 Intermediate 17661 9-5/8" 47# L -80 38 - 17661 38 - 8123 6870 4760 Production Liner Liner Perforation depth: Measured depth: NONE - - - - True Vertical depth: _ Tubing: (size, grade, measured and true vertical depth) NONE 0 Packers and SSSV (type, measured and true vertical depth) NON NOV 0; 12. Stimulation or cement squeeze summary: P ?0 Intervals treated (measured): Treatment descriptions including volumes used and final pressure:le~ 13. Representative Daily Average Production or Injection Data Oil -Bbl Gas -Mcf Water -Bbl Casing Pressure Tubing pressure Prior to well operation: SUSPENDED Subsequent to operation: 14. Attachments: 15. Well Class after work: Copies of Logs and Surveys Run Exploratory❑ Dgmelopment 0 Service ❑ Daily Report of Well Operations X 16. Well Status after w( Oil El Gas WDSPL GSTOR ❑ WAG ❑ GINJ ❑ WINJ❑ SPLUG ❑ 17. 1 hereby certify that the foregoing is true and correct to the best of my knowledge. Sundry Number or N/A if C.O. Exempt: NA Contact Gary Preble Printed Name Gary Preble Title Data Management Engineer Signature Phone 564 -4944 Date 9/1/2010 Suspended Well Site Inspection Form Notify AOGCC inspectors at least 10 days prior to inspection to allow witness Well Name: PRUDHOE BAY UN NIA NK -41A Field /Pool: PRUDHOE BAY / NIAKUK OIL Permit # (PTD): 1971580 API Number: 50029227780100 Operator: BP EXPLOR (ALASKA) INC Date Suspended: 11/2/1997 Surface Location: Section: 36 Twsp: 12N Range: 15E Nearest active pad or road: Niakuk pad Take to Location Digital camera Map showing well location /Aerial photos Brief well history Wellbore diagram showing downhole condition Latest Sundry or Completion report Past Site Visit documentation Site clearance documentation Pressure gauges, fittings, tools Sample containers for fluids on or near pad Condition of Surface Location AOGCC requires: 1) a description of the condition of the surface location, including discoloration, fluids or sheens visible on the ground or in any nearby water, 2) photographs showing the condition of the location surrounding the well General location condition: Good Pad or location surface: OK Location cleanup needed: None Pits condition: Full of water Surrounding area condition: Good Water /fluids on pad: Yes Discoloration, Sheens on pad, pits or water: No Samples taken: No Access road condition: OK Photographs taken (# and description): 5; general site and wellhead Condition of Wellhead AOGCC requires: 1) a description of the condition of the wellhead, 2) well pressure readings, where practicable, 3) photographs showing the wellhead condition Wellhead /treelvalve description, condition: Good; FMC _ Cellar description, condition, fluids: Gravel level Rat Hole: NIA Wellhouse or protective barriers: None Well identification sign: None Tubing Pressure (or casing if no tubing): NIA Annulus pressures: ]A: 420 psi OA: 0 psi .---:r L A' Sc i �� `� y /�a 5 t` - — Wellhead Photos taken (# and description): 5; general site and wellhead Work Required: Move flow -line blankets and timbers from wellhouse. Ordered wellhouse sign Operator Rep (name and signature): Torin Roschinger= AOGCC Inspector: Chuck Scheve Other Observers: Ry n Holt Inspection Date: 8/21/2010 AOGCC Notice Date: 8/13/2010 Time of arrival: 9:20 AM Time of Departure: 9:30 AM Site access method: Access Road TREE= 7 -1/16" CIW w /FMC FLANGE qw WELLHEAD = 13 -5/8" FMC NK-41A [AFETY NOTES: 70° @ 4900' ACTUATOR BAKER KB. R EV = 40.7' BF. REV= 39.7' KOP = - 2406' 2200' FREEZE PROTECTION, (DIESEL) Max Angle = 11500' Datum MD = 19806' Datum TVD = 8800' SS 2' PUP OF 7" CSG, 26 #, NSCC, ID = 6.276" ? SET IN TBG HGR 8.5 ppg SEAWATER 13 -3/8" CSG, 68 #, L -80, ID = 12.415" 7041' 13 -3/8" CSG MILLOUT WINDOW (NK- 41A):' -' 17015' TAGGED TOP OF CMT, PLUG #3: 140 BBL "G" CMT @ 17.0 ppg, SETTING DEPTH 18453' 9 -5/8" CSG, 47 #, L -80, ID = 8.681" 17661' 18543' TOP OF CMT, PLUG #2: 140 BBL "G" CMT @ 17.0 ppg, SETTING DEPTH 19943' 20148' FISH DRILLPIPE- 2354' 11.5 ppg OBM (BTM @ 22502') N 22900' ESTIMATED TOP OF CMT, PLUG #1: 51 BBL "G" CMT @ 15.8 ppg TD 23561' DATE REV BY COMMENTS DATE REV BY COMMENTS NIAKUK UNIT 11/03/97 SUSPENSION WELL: NK -41 A 01/22/01 SIS -Isi CONVERTED TO CANVAS PERMIT No: 197 -1580 02/23/01 SIS -LG FINAL API No: 50- 029 - 22778 -01 01/03/02 RN/TP CORRECTIONS SEC 36, T1 2N, RI 5E, 479.02 FEL 4222.66 FNL 04/08/09 BG /SV CORRECTIONS Bp Exploration (Alaska) � I 80(Y 165 f� r 30 CD pq �- �28 9rOrr�2r3 �'SS � ' I � / I G��� 2� ■ ■ ■ ?o �2 EnterrEx it i 9A LI �-� 6 6 J �� I f~\ i i • SCALE: 1" = 154' WAP DATE: 2007 PRUDHOE BAY UNIT DS NK W;--1- 7 w"c N? T44 {m .s1 M95 cyn SNK July 13, 2009 Approximate Scale: 1 " =300' 2009- 13c -3 -18 AFRO-1WRiC a,. • + 9 �. :� „ i a -. ,� �; �. 1 '� i - i ;' .} E i; �x iy�` G` f ' .} � �' * C. �� � � � 9 n t M* _ � m n ., ,� � � � �. M'"'� _._ �� � �� . , �: ___. _ - r � �. r . _._._. _ _ ��' '` r; x� `` J`} �f ws�,�, rn s' �4'k �v� T � � r � y�. �LL s i dal i WOW F i w f w� k d6 � F- f � I WAN* a .�, ��, i1� �� ,. ��� • 4 � �, I r £ er.+F' .~ j'� ,;: t 4 � ., * Y ;� e� , a- _ %x , r ° _. rs i�"'`' . �� P < r ,.� _ ru i` i�.S. F �. WA �_ 0 0 NK -41A (PTD #1971580) TIO Plot W ell_ NK -41 3,000 Tbg —W— [A / tl4 DA 00A ooaA IA 1,000 A 07/09 /10 07,1 0/10 07/1710 07124110 07/91/10 08/07/10 08/14/10 08121/10 08/28/10 09/04/10 09/11/10 09/18/10 09/25/10 1W02 0 _THE MATERIAL UNDER THI_~_S COVER HAS BEEN ON OR BEFORE JANUARY 03 2001 . . p E M ATE IA L C:LOI~MFILM. DOC W U~N D E R TH IS M ARK ER- 'AOGCC Geological Materials Inventory PERMIT 97-158 ARCO Log Data Sent Received CTTNGS DESCP ,Lt~' HAND DRWN 19900-23561 12/17/1998 12/17/1998 WELL DEFIN SRVY ,qq: ARCO 40.70-23561 8/13/1998 8/13/1998 ADN ADN-TVD CCL/GR CDN CDR-TVD -r>~0-407 Completion Date Are dry ditch samples required? Was the well cored? yes Are tests required? yes &L'" 17500-22950 3/31/1998 3/31/1998 ~'/ BL 8100-9900 4/14/1998 4/14/1998 ~'~' 14700-16980 4/14/1998 4/14/1998 ~, ~c'~-,; .~ t'~ /~-. L ~0:2331g ~ - ~ 2 ~ ~t~200-10~00 ~,,4,~9~ 4,~4,~99~ yes ~*no And received? :~~-~no no Analysis _description received? ~, yes no Received? yes ~- no Box no Well is in compliance Comments Initial Wednesday, October 13, 1999 Page 1 of 1 BP EXPLORATION BP Exploration (A,a%.~DNFIDENTIAL 900 East Benson Boulevard RO. Box 196612 Anchorage. Alaska 99519-6612 (907) 561-5111 December17th, 1998 Alaska Oil and Gas Conservation Commission 3001 Porcupine Drive v,k,'k. ~ Anchorage, Alaska 99501 '1,~,\ F', L~ 1 ,.,,.._~',~-..- Dear AOGCC Representative, ~-~~ O...~ F~~''/~ Per the terms of the Tract 75 agreement enc--r-osed are the following bluelines, vellums and Lithology Logs for Niakuk #41. Log Date '"'ADN TVD NK-41 PB#1 (Vellum) -.ADN TVD NK-41 PB#2 (Vellum) CDR TVD NK-41 PB#3 (Vellum) --CDR TVD NK-41 PB#1 (Vellum) -CDR TVD NK-41 PB #2 (Vellum) / CDR MD NK-41 PB #3,(,Blueline & ~'ellum) ADN TVD NK-41 PB #3,(Blueline & ~/ellum) ADN MD NK-41 PB#3,(-Blueline &'Vellum) Cuttings Description Logs NK-41 A, Cuttings Description Logs NK-41 Cuttings Description Logs NK-41 PB#1 Cuttings Description Logs NK-41 PB#2 Cuttings Description Logs NK-41 PB#3 6/30/97-7/29/97 8/3/97-8/12/97 8/22/97-9/1/97 6/30/97-7/29/97 8/3/97-8/t 2/97 8/22/97-9/1/97 8/22/97-9/1/97 8/22/97-9/1/97 10/6/9 ~ 9/8/97 ~ 7/28/97 8/11/97 "~ 8/31/97 Please contact me at 564-5126 if you have any questions. Central North Slope - Greater Regional Opportunities MS Enclosures RECEIVED DEC 17 1998 Please sign below and return to Marian Sloan, BPX, Mail Stop MBg-4 for STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION WELL COMPLETION OR RECOMPLETION REPORT AND LOG 1. Status of Well Classification of Service Well I~ Oil [] Gas [] Suspended [] Abandoned ~1 Service 2. Name of Operator 7. Permit Number BP Exploration (Alaska)Inc. 97-158 397-200 3. Address 8. APl Number P.O. Box 196612, Anchorage, Alaska 99519-6612 50-029-22778-01 :d 4. Location of well at surface ' ':i" ~'~ '~ , -~~ 9. Unit or Lease Name 1474' NSL, 717' WEL, SEC. 36, T12N R15E, UM .... ~ ~ ' '~ ~ At top of productive interval I! ' .t j,ti,~,~l,~;ll¢~ ~ Niakuk 1, f 10. Well Number 843' NSL, 3139' EWL, SEC. 21, T12N, R16E, UM ]? NK-41A At total depth -, ~.~:H,~ 11 Field and Pool 1096' NSL, 4760' EWL, SEC. 21, T12N, R16E, UM ' -~ ' Niakuk Oil Pool 5. Elevation in feet (indicate KB, DF, etc.) J6. Lease Designation and Serial No. KBE = 60.2'I ADL 312827 12. Date Spudded 113. Date T.D. Reached j 14. Date Comp., Susp., or AbanO.115. Water depth, if offshore 116. No. of Completions 9/15/97 10/6/97 11/02/97 (suspended) I N/A MSL I One 17. Total Depth (MD+TVD)23561 10081 FT]I18' Plug Back Depth (MD+TVD)I19' Directi°nal Survey 120' Depth where SSSV set121' Thickness °f Permafr°st16496 7773 FTJ [~Yes []No N/A MD 1800' (Approx.) 122. Type Electric or Other Logs Run LWD, MWD, CDR, ADN, Gyro 23. CASING~ LINER AND CEMENTING RECORD CASING S E-I-I-lNG DEPTH HOLE SIZE WT. PER FT. GRADE TOP BO'FrOM SIZE CEMENTING RECORD AMOUNT PULLED 20" 94# H-40 43' 115' 30" !260 sx Arctic Set (Approx.) 13-3/8" 68# L-80 41' 7041' 16" 2038 sx PF 'E', 54 sx PF 'C'. 1190 sx Class 'G' 9-5/8" 47# L-80 38' 17661' 12-1/4" 742 sx Class 'G' 24. Perforations open to Production (MD+TVD of Top and 25. TUBING RECORD Bottom and interval, size and number) SIZE DEPTH SET (MD) PACKER SET (MD) None None MD TVD MD TVD 26. ACID, FRACTURE, CEMENT SQUEEZE, ETC. DEPTH INTERVAL (MD) AMOUNT & KIND OF MATERIAL USED 22138' - 23561' Cement plug, 51 bbls 'G' 18422' - 19943' Abandonment plug #1,140 bbls 'G' 16946' - 18453' Abandonment plug #2, 140 bbls 'G' Freeze protect with 144 bbls diesel 27. PRODUCTION TEST Date First Production I Method of Operation (Flowing, gas lift, etc.) N/A I N/A Date of Test Hours Tested PRODUCTION FOR OIL-BBL GAS-MCF WATER-BBL iCHOKE SIZE IGAS-OIL RATIO TEST PERIOD I Flow Tubing Casing Pressure [CALCULATED OIL-BBL GAS-MCF WATER-BBL OIL GRAVITY-APl (CORR) Press. 24-HOUR RATE 28. CORE DATA Brief description of lithology, porosity, fractures, apparent dips and presence of oil, gas or water. Submit core chips. Form 10-407 Rev. 07-01-80 Submit In Duplicate 29. Geologic Markers 30. Formation Tests Measured True Vertical Include interval tested, pressure data, all fluids Marker Name Depth Depth recovered and gravity, GOR, and time of each phase. Top Tuffs 20085' 8952' Base Tuffs 20380' 9051' Top HRZ 21190' 9323' Top Kuparuk 21890' 9560' Top Kingak 22730' 9836' 31. List of Attachments Summary of Daily Drilling Reports, Surveys , ,, 32. I hereby certify teat the foregoing is true and correct to the best of my knowledge Signed Dan(-~'~;"~'~'dY""¥*'~C"~-Sto,z ~r% /_~ .5 Fc~/'~ Title Drilling Superintendent Date ¢'~ ..~'6 ¢L¢¢ NK-41A 97-158 397-200 Prepared By Name/Number: Carol Withey, 564-4114 Well Number Permit No. / Approval No. , INSTRUCTIONS GENERAL: This form is designed for submitting a complete and correct well completion report and log on all types of lands and leases in Alaska. ITEM 1: Classification of Service Wells: Gas injection, water injection, steam injection, air injection, salt water disposal, water supply for injection, observation, injection for in-situ combustion. ITEM 5: Indicate which elevation is used as reference (where not otherwise shown) for depth measurements given in other spaces on this form and in any attachments. ITEM 16 AND 24: If this well is completed for separate production from more than one interval (multiple completion), so state in item 16, and in item 24 show the producing intervals for only the interval reported in item 27. Submit a separate form for each additional interval to be separately produced, showing the data pertinent to such interval. ITEM 21: Indicate whether from ground level (GL) or other elevation (DF, KB, etc.). ITEM 23: Attached supplemental records for this well should show the details of any multiple stage cementing and the location of the cementing tool. ITEM 27: Method of Operation: Flowing, Gas Lift, Rod Pump, Hydraulic Pump, Submersible, Water Injection, Gas Injection, Shut-In, Other-explain. ITEM 28: If no cores taken, indicate 'none'. Form 10-407 Rev. 07-01-80 ! Facility NK Main Pad Progress Report Rig POOL 7 Date 04 August 98 Date/Time 15 Sep 97 00:00-04:00 04:00-06:00 06:00-00:00 16 Sep 97 00:00-01:30 01:30-06:00 06:00-15:30 15:30-17:30 17:30-04:00 17 Sep 97 04:00-04:30 04:30-06:00 06:00-09:00 09:00-11:00 11:00-14:30 14:30-16:00 16:00-20:00 20:00-20:30 20:30-21:30 21:30-00:00 18 Sep 97 00:00-01:30 01:30-04:00 04:00-04:30 04:30-06:00 06:00-07:00 07:00-09:30 09:30-10:00 10:00-12:30 12:30-14:00 14:00-16:00 16:00-16:30 16:30-18:00 18:00-19:00 19:00-19:30 i 9:30-20:00 20:00-06:00 9 Scp 97 06:00-06:00 Duration z~ l~r 2 hr 18hr 1-1/2 hr 4-1/2 hr 9-1/2 hr 2 hr 10-1/2 hr 1/2 hr 1-1/2 hr 3 hr 2 hr 3-1/2 hr 1-1/2 hr 4 hr 1/2 hr 1 hr 2-I/2 hr 1-1/2 hr 2-1/2 hr 1/2 hr 1-1/2 hr I hr 2-1/2 hr 1/2 hr 2-1/2 hr 1-1/2 hr 2 hr 1/2 hr 1-I/2 hr I hr 1/2 hr 1/2 hr 10 hr 24 hr Activity Drilled cement to 1767520 tt tS~'~-~ ~k~'~ ('J~'-~ 0 !}?~' ~(~ Circulated at 17675.0 a ~ ~[ ~d~'~ ~~ ~ ~ Drilled to 18179.0 ft _ Circulated at 18179.0 ft Drilled to 18255.0 R Drilled m 18504.0 ~ (cont...) Circulated at 18504.0 ft Drilled to 18787.0 ~ Circulated at 18787.0 ft Drilled to 18824.0 ~ Drilled {o 18903.0 R (cont...) Circulated at 18~3.0 ft Pull~ out of hole to 14350.0 ft Serviced Bl~k line Pulled out of hole to 7800.0 ~ Repaired Iron roughneck Laid down 940.0 ~ of 5-1/2in OD drill pi~ Pulled out of hole to 249.0 ft Pulled BHA Tested Well control Serviced Top drive Made up BHA no. 21 Made up BHA no. 21 (cont...) R.I.H. to 6053.0 ft Rigged up Dfills~ing handling equipment Singled in drill pipe to 83~.0 ft Circulated at 83~.0 ft R.I.H. m 13644.0 ft Circulated at 13644.0 ft R.I.H. to 17671.0 ft Circulated at 17671.0 ft R.I.H. to 18878.0 ft Reamed to 18903.0 ft Drilled to 194~.0 ft Drilled to 20300.0 ft Facility NK Main Pad Progress Report Well NK-41 Rig POOL 7 Page 2 Date 04 August 98 Date/Time 20 Sep 97 21 Sep 97 22 Sep 97 23 Sep 97 24 Sep 97 25 Sep 97 26 Sep 97 27 Sep 97 28 Sep 97 06:00-22:00 22:00-00:00 00:00-01:30 01:30-02:30 02:30-06:00 06:00-23:00 23:00-06:00 06:00-16:30 16:30-18:30 18:30-19:00 19:00-20:00 20:00-00:00 00:00-05:00 05:00-05:30 05:30-06:00 06:00-10:00 10:00-10:30 10:30-12:30 12:30-13:00 13:00-17:00 17:00-18:30 18:30-21:30 21:30-23:30 23:30-02:30 02:30-03:00 03:00-04:00 04:00-06:00 06:00-07:30 07:30-08:00 08:00-10:00 10:00-10:30 10:30-12:30 12:30-13:30 13:30-16:00 16:00-02:00 02:00-06:00 06:00-06:05 06:05-06:30 06:30-06:00 06:00-04:00 04:00-06:00 06:00-06:30 06:30-08:00 08:00-18:30 18:30-22:30 22:30-01:30 01:30-03:00 03:00-05:30 05:30-06:00 06:00-09:00 09:00-09:30 09:30-10:00 10:00-13:00 13:00-13:30 Duration 16hr 2hr 1-1/2 hr lhr 3-1/2 hr 17hr 7 hr 10-1/2 hr 2 hr 1/2 hr 1 hr 4 hr 5 hr 1/2 hr 1/2 hr 4hr 1/2 hr 2 hr 1/2 hr 4 hr 1-1/2 hr 3 hr 2 hr 3 hr 1/2 hr 1 hr 2hr 1-1/2 hr 1/2 hr 2 hr 1/2 hr 2 hr 1 hr 2-1/2 hr 10 hr 4 hr 0 hr 1/4 hr 23-1/2 hr 22 hr 2hr 1/2 hr 1-1/2 hr 10-1/2 hr 4 hr 3hr 1-1/2 hr 2-1/2 hr 1/2 hr 3 hr 1/2 hr 1/2 hr 3hr 1/2 hr Activity Drilled to 20944.0 ft (cont...) Circulated at 20944.0 ft Pulled out of hole to 18890.0 ft R.I.H. to 20201.0 ft Reamed to 20190.0 ft Reamed to 20944.0 ft (cont...) Drilled to 21247.0 ft Drilled to 21626.0 ft (cont...) Set tool face Drilled to 21637.0 ft Set tool face Circulated at 21637.0 ft Pumped out of hole to 17600.0 ft Serviced Drillfloor / Derrick Pulled out of hole to 16940.0 ft Pulled out of hole to 11482.0 ft (cont...) Rigged up Drillstring handling equipment Laid down 2277.0 ft of 5-1/2in OD drill pipe Rigged up Drillstring handling equipment Pulled out of hole to 250.0 ft Pulled BHA Tested Well control Made up BHA no. 22 Investigated pressure change Serviced Top drive Made up BHA no. 22 R.I.H. to 5500.0 ft R.I.H. to 9240.0 ft (cont...) Rigged up Drillstring handling equipment Singled in drill pipe to 11517.0 ft Circulated at 11517.0 ft R.I.H. to 17680.0 ft Serviced Block line R.I.H. to 21495.0 ft Reamed to 21637.0 ft Drilled to 21745.0 ft Drilled to 21745.0 ft (cont...) Worked toolstring at 21745.0 ft Drilled to 22605.0 ft Drilled to 23056.0 ft (cont...) Circulated at 23056.0 ft Circulated at 23056.0 ft (cont...) Rest hole at 23056.0 ft Pumped out of hole to 17660.0 ft Pulled out of hole to 8000.0 ft Laid down 2060.0 ft of 5-1/2in OD drill pipe Pulled out of hole to 248.0 ft Pulled BHA Made up BHA no. 23 Made up BHA no. 23 (cont...) Tested Survey instruments - Via string Singled in drill pipe to 706.0 ft R.I.H. to 6400.0 ft Circulated at 6400.0 ft Progress Report Facility NK Main Pad Well NK-41 Rig POOL 7 Page 3 Date 04 August 98 Date/Time 29 Sep 97 30 Sep 97 01 Oct 97 02 Oct 97 03 Oct 97 04 Oct 97 05 Oct 97 06 Oct 97 07 Oct 97 08 Oct 97 13:30-15:30 15:30-17:30 17:30-18:30 18:30-20:30 20:30-22:00 22:00-04:30 04:30-06:00 06:00-08:00 08:00-10:00 10:00-11:00 11:00-13:00 13:00-13:30 13:30-14:30 14:30-22:30 22:30-23:00 23:00-06:00 06:00-06:00 06:00-06:00 06:00-16:00 16:00-16:30 16:30-17:00 17:00-06:00 06:00-13:00 13:00-13:30 13:30-15:30 15:30-04:00 04:00-04:30 04:30-06:00 06:00-06:00 06:00-06:00 06:00-20:30 20:30-01:00 01:00-06:00 06:00-10:00 10:00-12:00 12:00-14:30 14:30-15:00 15:00-20:00 20:00-22:00 22:00-22:30 22:30-00:00 00:00-02:30 02:30-03:30 03:30-04:30 04:30-05:00 05:00-06:00 06:00-07:00 07:00-07:30 07:30-10:00 10:00-11:30 11:30-12:00 12:00-19:00 19:00-22:00 22:00-22:30 Duration 2 hr 2hr 1 hr 2 hr 1-1/2 hr 6-1/2 hr 1-1/2 hr 2hr 2hr lhr 2hr 1/2 hr 1 hr 8hr 1/2 hr 7 hr 24 hr 24 hr 10hr 1/2 hr 1/2 hr 13hr 7 hr 1/2 hr 2hr 12-1/2 hr 1/2 hr 1-1/2 hr 24 hr 24 hr 14-1/2 hr 4-1/2 hr 5 hr 4 hr 2 hr 2-1/2 hr 1/2 hr 5hr 2 hr 1/2 hr 1-1/2 hr 2-1/2 hr 1 hr 1 hr 1/2 hr 1 hr lhr 1/2 hr 2-1/2 hr 1-1/2 hr 1/2 hr 7 hr 3 hr 1/2 hr Activity Singled in drill pipe to 8000.0 ft R.I.H. to 11844.0 ft Circulated at 11844.0 ft R.I.H. to 17660.0 ft Circulated at 17660.0 ft R.I.H. to 22490.0 ft Pulled out of hole to 21070.0 ft Circulated at 21070.0 ft Pulled out of hole to 19811.0 ft Reamed to 20084.0 ft Worked toolstring at 20084.0 ft Reamed to 20130.0 ft Worked toolstring at 20130.0 ft Reamed to 20188.0 ft Circulated at 20033.0 ft Reamed to 20163.0 ft Reamed to 21321.0 ft (cont...) Reamed to 21321.0 ft (cont...) Reamed to 22757.0 ft (cont...) Pulled out of hole to 22725.0 ft Circulated at 22725.0 ft Reamed to 22880.0 ft Reamed to 23056.0 ft (cont...) Drilled to 23067.0 ft Circulated at 23050.0 ft Drilled to 23218.0 ft Circulated at 23218.0 ft Drilled to 23223.0 ft Drilled to 23343.0 ft (cont...) Drilled to 23493.0 ft (cont...) Drilled to 23561.0 ft (cont...) Circulated at 23561.0 ft Circulated at 23561.0 ft Circulated at 23561.0 ft (cont...) Rest hole at 23561.0 ft Pumped out of hole to 22150.0 ft Circulated at 22150.0 ft Pulled out of hole to 17600.0 ft Circulated at 17600.0 ft Rest hole at 17600.0 ft Installed BOP test plug assembly Tested BOP stack Retrieved BOP test plug assembly Tested Internal BOPs Serviced Drillfloor / Derrick R.I.H. to 18530.0 ft R.I.H. to 20162.0 ft (cont...) Reamed to 20188.0 ft R.I.H. to 23020.0 ft Circulated at 23005.0 ft R.I.H. to 23561.0 ft Circulated at 23561.0 ft Circulated at 23561.0 ft Pulled out of hole to 22540.0 ft Progress Report Facility NK Main Pad Well NK-41 Rig POOL 7 Page 4 Date 04 August 98 Date/Time 09 Oct 97 10 Oct 97 11 Oct 97 12 Oct 97 13 Oct 97 22:30-01:30 01:30-04:30 04:30-05:30 05:30-06:00 06:00-10:30 10:30-12:30 12:30-15:30 15:30-16:30 16:30-19:00 19:00-21:00 21:00-23:00 23:00-23:30 23:30-01:00 01:00-02:30 02:30-03:30 03:30-05:00 05:00-06:00 06:00-07:00 07:00-08:00 08:00-09:30 09:30-10:00 10:00-15:00 15:00-19:00 19:00-21:00 21:00-00:00 00:00-03:00 03:00-04:00 04:00-06:00 06:00-10:00 10:00-12:30 12:30-13:30 13:30-15:00 15:00-15:30 15:30-19:00 19:00-19:30 19:30-22:30 22:30-23:30 23:30-00:00 00:00-06:00 06:00-09:00 09:00-10:30 10:30-12:00 12:00-13:00 13:00-14:30 14:30-16:00 16:00-16:30 16:30-19:00 19:00-20:30 20:30-21:30 21:30-22:00 22:00-02:00 02:00-04:30 04:30-06:00 06:00-06:30 Duration 3hr 3hr 1 hr 1/2 hr 4-1/2 hr 2 hr 3hr 1 hr 2-1/2 hr 2 hr 2 hr 1/2 hr 1-1/2 hr 1-1/2 hr lhr 1-1/2 hr lhr 1 hr 1 hr 1-1/2 hr 1/2 hr 5 hr 4hr 2 hr 3 hr 3 hr 1 hr 2 hr 4hr 2-1/2 hr 1 hr 1-1/2 hr 1/2 hr 3-1/2 hr 1/2 hr 3hr lhr 1/2 hr 6 hr 3hr 1-1/2 hr 1-1/2 hr 1 hr 1-1/2 hr 1-1/2 hr 1/2 hr 2-1/2 hr 1-1/2 hr lhr 1/2 hr 4 hr 2-1/2 hr 1-1/2 hr 1/2 hr Activity Circulated at 22540.0 ft Pulled out of hole to 17600.0 ft Serviced Block line Pulled out of hole to 16800.0 ft Pulled out of hole to 7000.0 ft (cont...) Laid down 1581.0 ft of 5-1/2in OD drill pipe Pulled out of hole to 706.0 ft Laid down 462.0 ft of 5in OD drill pipe Pulled BHA Singled in drill pipe to 580.0 ft Ran Drillpipe in stands to 6400.0 ft Circulated at 6400.0 ft Singled in drill pipe to 7240.0 ft Ran Drillpipe in stands to 12500.0 ft Circulated at 12500.0 ft Ran Drillpipe in stands to 17600.0 ft Circulated at 17600.0 ft Circulated at 17600.0 ft (cont...) Ran Drillpipe in stands to 20434.0 ft Circulated at 20434.0 ft Ran Drillpipe in stands to 20725.0 ft Worked toolstring at 20809.0 ft Worked toolstring at 20809.0 ft Ran Drillpipe in stands to 23561.0 ft Circulated at 23561.0 ft Circulated at 23561.0 ft Pulled out of hole to 22870.0 ft Circulated at 22870.0 ft Circulated at 22870.0 ft (cont...) Washed to 23561.0 ft Mixed and pumped slurry - 51.000 bbl Displaced slurry - 477.000 bbl Pulled out of hole to 22603.0 ft Circulated at 22603.0 ft Pulled out of hole to 22138.0 ft Circulated at 22138.0 ft Pulled out of hole to 19000.0 ft Circulated at 19000.0 ft Pulled out of hole to 8700.0 ft Pulled out of hole to 8700.0 ft (cont...) Laid down 840.0 ft of Drillpipe Laid down 546.0 ft of Drillpipe Serviced Drillfloor / Derrick Serviced Block line Made up BHA no. 24 Downloaded MWD tool Made up BHA no. 24 R.I.H. to 5660.0 ft Singled in drill pipe to 6500.0 ft Circulated at 6500.0 ft R.I.H. to 17600.0 ft Circulated at 17600.0 ft R.I.H. to 20000.0 ft R.I.H. to 20110.0 ft (cont...) Progress Report Facility NK Main Pad Well NK-41 Page 5 Rig POOL 7 Date 04 August 98 Date/Time 14 Oct 97 15 Oct 97 16 Oct 97 17 Oct 97 18 Oct 97 19 Oct 97 20 Oct 97 06:30-09:30 09:30-19:00 19:00-06:00 06:00-08:00 08:00-00:00 00:00-01:30 01:30-06:00 06:00-08:00 08:00-09:00 09:00-10:00 10:00-10:30 10:30-14:30 14:30-06:00 06:00-09:30 09:30-10:00 10:00-13:00 13:00-16:30 16:30-17:30 17:30-18:30 18:30-23:00 23:00-06:00 06:00-17:00 17:00-21:00 21:00-21:30 21:30-01:00 01:00-02:00 02:00-06:00 06:00-07:00 07:00-09:30 09:30-10:00 10:00-15:30 15:30-17:30 17:30-20:30 20:30-21:30 21:30-00:00 00:00-01:00 01:00-02:30 02:30-03:00 03:00-03:30 03:30-06:00 06:00-07:30 07:30-08:30 08:30-15:30 15:30-17:30 17:30-18:00 18:00-20:00 20:00-01:00 01:00-02:00 02:00-06:00 06:00-09:30 09:30-11:00 11:00-15:30 Duration 3 hr 9-1/2 hr llhr 2hr 16hr 1-1/2 hr 4-1/2 hr 2hr 1 hr 1 hr 1/2 hr 4 hr 15-1/2 hr 3-1/2 hr 1/2 hr 3hr 3-1/2 hr lhr lhr 4-1/2 hr 7 hr llhr 4 hr 1/2 hr 3-1/2 hr 1 hr 4 hr 1 hr 2-1/2 hr 1/2 hr 5-1/2 hr 2hr 3 hr 1 hr 2-1/2 hr lhr 1-1/2 hr 1/2 hr 1/2 hr 2-1/2 hr 1-1/2 hr lhr 7 hr 2hr 1/2 hr 2 hr 5hr lhr 4hr 3-1/2 hr 1-1/2 hr 4-1/2 hr Activity Reamed to 20080.0 ft Reamed to 21190.0 ft Logged hole with LWD: Formation evaluation (FE) from 22570.0 ft to 21190.0 ft Logged hole with LWD: Formation evaluation (FEi) from 22570.0 ft to 22872.0 ft (cont...) Jarred stuck pipe at 22872.0 ft Rigged up Logging/braided cable equipment Conducted electric cable operations Conducted electric cable operations (cont...) Conducted electric cable operations Rigged down Logging/braided cable equipment Serviced Drillfloor / Derrick Rigged up Logging/braided cable equipment Conduct braided cable operations - 3/16 size cable Conduct braided cable operations - 3/16 size cable (cont...) Flow check Conduct braided cable operations - 3/16 size cable Retrieved Downhole tools Rigged down Logging/braided cable equipment Worked stuck pipe at 22872.0 ft Circulated at 22782.0 ft Backreamed to 20616.0 ft Backreamed to 22200.0 ft (cont...) Pulled out of hole to 17600.0 ft Serviced Top drive Pulled out of hole to 13000.0 ft Laid down 936.0 ft of 5-1/2in OD drill pipe Pulled out of hole to 1600.0 ft Pulled out of hole to 658.0 ft (cont...) Pulled BHA Rigged up Handling equipment Tested Well control Made up BHA no. 25 R.I.H. to 6746.0 ft Held drill (Spill) R.I.H. to 12000.0 ft Singled in drill pipe to 12936.0 ft R.I.H. to 17600.0 ft Serviced Top drive Serviced Block line Circulated at 17600.0 ft Circulated at 17600.0 ft (cont...) R.I.H. to 19480.0 ft Circulated at 19480.0 ft R.I.H. to 22409.0 ft Reamed to 22502.0 ft Worked toolstring at 22502.0 ft Backreamed to 22305.0 ft Circulated at 22250.0 ft Reamed to 22430.0 ft Reamed to 22460.0 ft (cont...) Pulled out of hole to 22280.0 ft Reamed to 22422.0 ft Progress Report Facility NK Main Pad Well NK-41 Rig POOL 7 Page 6 Date 04 August 98 Date/Time 21 Oct 97 22 Oct 97 23 Oct 97 24 Oct 97 25 Oct 97 26 Oct 97 15:30-16:30 16:30-18:00 18:00-19:30 19:30-21:30 21:30-22:30 22:30-23:30 23:30-02:30 02:30-03:30 03:30-06:00 06:00-06:30 06:30-08:30 08:30-10:30 10:30-12:00 12:00-13:00 13:00-14:00 14:00-15:00 15:00-16:30 16:30-19:30 19:30-20:30 20:30-22:00 22:00-01:00 01:00-02:30 02:30-03:30 03:30-05:00 05:00-06:00 06:00-07:30 07:30-08:30 08:30-09:00 09:00-12:00 12:00-18:00 18:00-20:00 20:00-01:00 01:00-06:00 06:00-20:00 20:00-20:30 20:30-03:00 03:00-04:00 04:00-06:00 06:00-07:00 07:00-13:00 13:00-00:00 00:00-01:00 01:00-04:00 04:00-06:00 06:00-07:30 07:30-10:00 10:00-11:30 11:30-17:30 17:30-21:00 21:00-00:00 00:00-03:30 03:30-06:00 06:00-07:30 07:30-11:00 Duration 1 hr 1-1/2 hr 1-1/2 hr 2 hr 1 hr 1 hr 3 hr 1 hr 2-1/2 hr 1/2 hr 2 hr 2 hr 1-1/2 hr lhr 1 hr 1 hr 1-1/2 hr 3hr 1 hr 1-1/2 hr 3 hr 1-1/2 hr 1 hr 1-1/2 hr 1 hr 1-1/2 hr lhr 1/2 hr 3 hr 6 hr 2 hr 5 hr 5 hr 14hr 1/2 hr 6-1/2 hr 1 hr 2 hr 1 hr 6 hr llhr lhr 3 hr 2 hr 1-1/2 hr 2-1/2 hr 1-1/2 hr 6 hr 3-1/2 hr 3 hr 3-1/2 hr 2-1/2 hr 1-1/2 hr 3-1/2 hr Activity Circulated at 22422.0 ft Reamed to 22448.0 ft Circulated at 22448.0 ft Reamed to 22455.0 ft Circulated at 22455.0 ft Pulled out of hole to 22240.0 ft Reamed to 22309.0 ft Circulated at 22309.0 ft Reamed to 22453.0 ft Reamed to 22453.0 ft (cont...) Circulated at 22453.0 ft Reamed to 22456.0 ft Circulated at 11456.0 ft Reamed to 22462.0 ft Worked toolstring at 22409.0 ft Reamed to 22442.0 ft Circulated at 22442.0 ft Reamed to 22453.0 ft Worked toolstring at 22416.0 ft Circulated at 22416.0 ft Reamed to 22450.0 fl Circulated at 22450.0 ft Reamed to 22462.0 ft Worked toolstring at 22336.0 ft Reamed to 22356.0 ft Reamed to 22404.0 ft (cont...) Circulated at 22404.0 ft Reamed to 22406.0 ft Rest hole at 22406.0 fl Pumped out of hole to 19018.0 fl R.I.H. to 22214.0 ft Worked toolstring at 22214.0 ft Pulled out of hole to 18829.0 ft Pulled out of hole to 5975.0 ft (cont...) Rigged up Drillstring handling equipment Laid down 3619.0 ft of 5-1/2in OD drill pipe Serviced Drillfloor / Derrick Serviced Drillpipe Rigged up BOP handling equipment Tested Well control Repaired Internal BOPs Rigged up Drillfloor / Derrick Made up BHA no. 26 Singled in drill pipe to 1300.0 ft Singled in drill pipe to 2666.0 ft (cont...) R.I.H. to 4600.0 ft Circulated at 4600.0 fl R.I.H. to 17600.0 ft Circulated at 17600.0 ft R.I.H. to 19880.0 ft Reamed to 20138.0 fl Backreamed to 20030.0 ft Backreamed to 19642.0 ft (cont...) Reamed to 20143.0 fl Progress Report Facility NK Main Pad Well NK-41 Page 7 Rig POOL 7 Date 04 August 98 Date/Time 27 Oct 97 28 Oct 97 29 Oct 97 30 Oct 97 31 Oct 97 11:00-12:00 12:00-17:00 17:00-18:30 18:30-22:00 22:00-23:00 23:00-01:30 01:30-06:00 06:00-09:00 09:00-12:00 12:00-16:00 16:00-16:30 16:30-17:00 17:00-20:30 20:30-22:30 22:30-00:00 00:00-02:00 02:00-04:30 04:30-06:00 06:00-06:30 06:30-12:00 12:00-13:30 13:30-14:30 14:30-16:30 16:30-17:00 17:00-19:00 19:00-01:00 01:00-05:00 05:00-06:00 06:00-09:00 09:00-10:00 10:00-10:30 10:30-13:00 13:00-14:30 14:30-15:00 15:00-16:30 16:30-18:00 18:00-21:00 21:00-23:00 23:00-23:30 23:30-02:30 02:30-06:00 06:00-10:00 10:00-11:00 11:00-14:30 14:30-15:30 15:30-17:00 17:00-20:00 20:00-21:30 21:30-23:30 23:30-02:30 02:30-04:00 04:00-06:00 06:00-07:30 07:30-08:30 Duration lhr 5 hr 1-1/2 hr 3-1/2 hr 1 hr 2-1/2 hr 4-1/2 hr 3 hr 3hr 4 hr 1/2 hr 1/2 hr 3-1/2 hr 2hr 1-1/2 hr 2 hr 2-1/2 hr 1-1/2 hr 1/2 hr 5-1/2 hr 1-1/2 hr 1 hr 2 hr 1/2 hr 2hr 6 hr 4 hr 1 hr 3 hr 1 hr 1/2 hr 2-1/2 hr 1-1/2 hr 1/2 hr 1-1/2 hr 1-1/2 hr 3 hr 2 hr 1/2 hr 3 hr 3-1/2 hr 4 hr 1 hr 3-1/2 hr 1 hr 1-1/2 hr 3hr 1-1/2 hr 2 hr 3hr 1-1/2 hr 2hr 1-1/2 hr 1 hr Activity Backreamed to 20133.0 ft Washed over string at 20143.0 ft Pulled out of hole to 19692.0 ft Circulated at 19692.0 ft Rest hole at 19692.0 ft Pumped out of hole to 17600.0 ft Pulled out of hole to 4660.0 ft Pulled out of hole to 2667.0 ft (cont...) Laid down 2152.0 ft of 5-1/2in OD drill pipe Pulled BHA Rigged down Drillfloor / Derrick Rigged up Drillstring handling equipment Singled in drill pipe to 2588.0 ft R.I.H. to 7000.0 ft Circulated at 7000.0 ft R.I.H. to 15000.0 ft Circulated at 15000.0 ft R.I.H. to 18900.0 ft R.I.H. to 19650.0 ft (cont...) Washed to 20137.0 ft Washed to 20091.0 ft Pulled out of hole to 19745.0 ft Rigged up Survey wireline unit Pulled out of hole to 0.0 ft Rigged up Survey wireline unit Conducted electric cable operations Conducted electric cable operations Conducted electric cable operations Conducted electric cable operations (cont...) Rigged down sub-surface equipment - Survey instruments Washed to 19943.0 ft Circulated at 19943.0 ft Flow check Rigged up Cement unit Mixed and pumped slurry - 140.000 bbl Pulled out of hole to 18422.0 ft Circulated at 18422.0 ft Mixed and pumped slurry - 140.000 bbl Pulled out of hole to 16946.0 ft Circulated at 16946.0 ft Pulled out of hole to 9400.0 ft Pulled out of hole to 3000.0 ft (cont...) Laid down 377.0 ft of 5-1/2in OD drill pipe Laid down 2589.0 ft of 3-1/2in OD drill pipe Serviced Drillfloor / Derrick Made up BHA no. 28 R.I.H. to 5000.0 ft Circulated at 5000.0 ft R.I.H. to 10000.0 ft Circulated at 10000.0 ft R.I.H. to 15000.0 ft Circulated at 15000.0 ft Circulated at 15000.0 ft (cont...) Serviced Block line Progress Report Facility NK Main Pad Well NK-41 Rig POOL 7 Page 8 Date 04 August 98 Date/Time 01 Nov 97 02 Nov 97 08:30-09:30 09:30-10:30 10:30-16:00 16:00-18:30 18:30-19:00 19:00-23:00 23:00-03:00 03:00-06:00 06:00-21:00 21:00-22:30 22:30-23:30 23:30-02:00 02:00-06:00 06:00-08:30 08:30-12:00 12:00-12:30 12:30-18:00 18:00-21:00 21:00-22:30 Duration 1 hr 1 hr 5-1/2 hr 2-1/2 hr 1/2 hr 4hr 4hr 3 hr 15hr 1-1/2 hr 1 hr 2-1/2 hr 4 hr 2-1/2 hr 3-1/2 hr 1/2 hr 5-1/2 hr 3 hr 1-1/2 hr Activity Washed to 15490.0 ft Serviced Top drive Washed to 17015.0 ft Circulated at 17015.0 ft Tested Casing - Via annulus and string Circulated at 17015.0 ft Cleared Mud pumps Laid down 3100.0 ft of 5-1/2in OD drill pipe Laid down 11700.0 ft of 5-1/2in OD drill pipe (cont...) Circulated at 2200.0 ft Repaired Drillstring handling equipment Laid down 2200.0 ft of 5-1/2in OD drill pipe Tested Seal assembly Installed Seal assembly Installed Tubing hanger Installed Hanger plug Removed BOP stack Installed Xmas tree Installed Hanger plug Well Definition Survey Details Report Operator: ARCO Field: Niakuk Well: NK-41A Date: 20:09, 06 Aug 98 Page: 1 DEFINITIVE WDF : Yes Description : Final Definitive Survey Associated wellbore : Current WDF type : Composite Created/Updated By delappcs on 11:10, 05 Feb 98 Facility Details : Actual Location Coordinates Latitude 70 deg 21 min 5.879 sec N Longitude Eastings 714553.260 feet Northings 5981257.790 feet Geodetic Datum NAD27AFT Mapping Projection TMALSK4F Grid data at Well Reference Point : Convergence 1.696226 deg Scale Factor 0.999956 148 deg 15 min 27.984 Tie In Details Tie In Type : Well Reference Coordinates MD Inc Azi North East (ft) (deg) (deg) (ft) (ft) 40.70 0.000 0.000 0.00 0.00 TVD (ft) 40.70 Concatenation of survey stations Number of Survey Points : 389 End Depth : 23561.00 ft Extrapolation to TD - average build rate : - average walk rate : 0.000 deg/100ft 0.000 deg/100ft Survey Composition Details Survey Description Gyrodata drillpipe multishot -continuous MWD - Standard (input as multishot) All Depths are relative to BRT on rig POOL 7 All Azimuths are relative to TRUE North Start Depth (ft) 100.00 17946.10 End Depth (ft) 17850.00 23477.10 ORIGINAL Well Definition Survey Details Report Operator: ARCO Field: Niakuk Well: NK-41A Date: 20:09, 06 Auw 98 Pawe: 2 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North (ft) 40.70 100.00 200.00 300.00 400.00 500.00 599.00 699.00 799.00 903.00 1000.00 1101.00 1200.00 1308.00 1399.00 1500.00 1599.00 1700.00 1805.00 1904.00 2006.00 2106.00 2206.00 2306.00 2406.00 Inc Azi (dew) (dew) 0.00 0.00 0.27 312.90 0.08 60.42 0.23 165.55 0.25 285.22 0.19 313.96 0.14 102.51 0.28 246.75 0.14 348.96 0.16 90.67 0.22 242.90 0.26 339.33 0.23 7 88 0.25 4 38 0.28 27 01 0.29 28 71 0.27 348 18 0.32 357 94 0.77 40 76 1.82 48.86 3.58 43.78 5.30 39.20 6.41 39.83 7.80 43 99 8.35 45 17 2506.00 11.05 46 67 2606.00 13.47 46 16 2706.00 15.30 47 25 2756.00 16.59 48 38 2800.00 17.51 48.62 2850.00 17.93 49.17 2900.00 18.69 49.71 2950.00 19.13 51.56 3000.00 20.35 52.36 3050.00 22.14 51.84 North (ft) 0.00 0.10 0.29 0.13 -0.01 0.17 0.25 0.13 0.15 0.28 0.19 0.32 0.72 1.17 1.57 2.01 2.46 2.98 3 80 5 34 8 71 14 54 22 41 31 58 41 58 53 27 67 92 84 94 94.16 102.71 112.72 122.93 133.20 143.61 154.74 East TVD(BRT) TVD(SS) (ft) 0 00 -0 10 -0 21 -0 10 -0 26 -0 59 -0 59 -0 70 -0.95 -0.83 -0.86 -1.11 -1.16 -1.11 -1.00 -0.76 -0.69 -0.75 -0.30 1.32 4.74 9.82 16.32 24.61 34.47 46.59 61.96 80.06 90.24 99 90 111 37 123 30 135 83 149 13 163 42 DLS (ft) (deg/100ft) (ft) 40.70 -19.40 100.00 39.90 200.00 139.90 300.00 239.90 400.00 339.90 500.00 439.90 599.00 538.90 699.00 638.90 799.00 738.90 903.00 842.90 1000.00 939.90 1101.00 1040.90 1200.00 1139.90 1307.99 1247.89 1398.99 1338.89 1499.99 1439.89 1598.99 1538.89 1699.99 1639.89 1804.98 1744.88 1903.96 1843.86 2005.84 1945.74 2105.54 2045.44 2205.01 2144.91 2304 24 2244.14 2403 25 2343.15 2501 81 2441.71 2599 53 2539.43 2696 39 2636.29 2744 46 2684.36 2786 53 2726.43 2834 16 2774.06 2881 62 2821.52 2928.93 2868.83 2975.99 2915.89 3022.59 2962.49 0.000 0.455 0.304 0.262 0.415 0.124 0.321 0.402 0.338 0.224 0.381 0.355 0.126 0.023 0.119 0.013 0.197 0.070 0.550 1.074 1 740 1 755 1 112 1 481 0 574 2 712 2.422 1.850 2 654 2 097 0 904 1 557 1 487 2 499 3 600 Easting (feet) 721841.36 721841.25 721841.13 721841.25 721841.09 721840.76 721840.75 721840.65 721840.40 721840.52 721840.49 721840.24 721840.17 721840.21 721840.31 721840.53 721840.59 721840.52 721840.94 721842.52 721845.84 721850.74 721857.00 721865.01 721874.58 721886.35 721901.28 721918.86 721928.76 721938.17 721949.33 721960.96 721973.18 721986.16 722000.12 Northing Latitude Longitu (feet) Deg Min Sec Deg Min S 5980017.95 nT0 20 51 603 w148 11 56 1 5980018.04 nT0 20 51 603 w148 11 56 1 5980018.24 n70 20 51 605 w148 11 56 1 5980018.08 nT0 20 51 604 w148 11 56 1 5980017.94 n70 20 51 602 w148 11 56 1 5980018.10 n70 20 51 604 w148 11 56 1 5980018.19 n70 20 51.605 w148 11 56 1 5980018.06 n70 20 51.604 w148 11 56 1 5980018.08 n70 20 51.604 w148 11 56 1 5980018.20 n70 20 51.605 w148 11 56 1 5980018.12 n70 20 51.604 w148 11 56 1 5980018.24 n70 20 51.606 w148 11 56 1 5980018.64 n70 20 51 610 w148 11 56 1 5980019.09 n70 20 51 614 w148 11 56 1 5980019.49 n70 20 51 618 w148 11 56 1 5980019.94 n70 20 51 622 w148 11 56 1 5980020.39 nT0 20 51 627 w148 11 56 5980020.91 n70 20 51 632 w148 11 56 5980021.75 nT0 20 51.640 w148 11 56 5980023.33 nT0 20 51.655 w148 11 56 5980026.80 nT0 20 51.688 w148 11 55 5980032.78 n70 20 51.746 w148 11 55 5980040.83 nT0 20 51.823 w148 11 55 5980050.24 n70 20 51.913 w148 11 55 5980060.53 n70 20 52 011 w148 11 55 5980072.58 n70 20 52 5980087.67 n70 20 52 5980105.23 n70 20 52 5980114.74 n70 20 52 5980123.57 n70 20 52 5980133.91 n70 20 52 5980144.47 n70 20 52 5980155.11 n70 20 52 5980165.90 n70 20 53 5980177.45 n70 20 53 126 w148 11 54 271 w148 11 54 438 w148 11 53 529 w148 11 53 613 w148 11 53 711 w148 11 52 811 w148 11 52 913 w148 11 52 015 w148 11 51 124 w148 11 51 Well Definition Survey Details Report Operator: ARCO Field: Niakuk Well: NK-41A Date: 20:09, 06 Aug 98 Page: 3 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi (ft) (deg) (deg) 3100.00 24.16 49.92 3150.00 25.60 48.74 3200.00 27.01 47.19 3250.00 27.96 46.01 3300.00 29.01 45.49 3350.00 29.71 45.30 3400.00 31.06 45.67 3450.00 32.54 47.27 3500.00 33.82 48.70 3550.00 35.60 49.93 3600.00 37.19 51.11 3650.00 38.38 51.42 3700.00 39.92 51.28 3750.00 41.04 50.68 3800.00 42.52 50.12 3850.00 43.76 49.62 3900.00 45.01 49.19 3950.00 46.10 48.99 4000.00 47.24 48.21 4050.00 48.99 47.22 4100 00 50.38 46.43 4150 00 52.03 46.18 4200 00 53.64 46.07 4250 00 55.44 46.06 4300 00 57.17 46.09 4350 00 58.10 46.25 4400 00 58.46 46.54 4450.00 59.14 46.70 4500 00 60.35 46.53 4550 4600 4650 4700 4750 4800 00 61.99 46.40 00 63.17 45.98 00 64.45 45.44 00 65.85 45.07 00 66.99 44.66 00 68.43 44.39 North (ft) 167.15 180.86 195.70 211.56 228.20 245.41 263.14 281.28 299.59 318.14 337.00 356.17 375.89 396.32 417.56 439.59 462.35 485.73 509.78 534.83 560.92 587.84 615.45 643.71 672.57 701.81 731.15 760.52 790.19 820.36 851.08 882.41 914.35 East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longitu (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 178.66 3068.56 3008.46 4.312 722014.98 5980190.31 n70 20 53.246 w148 11 50 9 194.61 3113.92 3053.82 3.046 722030.52 5980204.49 n70 20 53.381 w148 11 50 4 211.06 3158.74 3098.64 3.137 722046.52 5980219.81 n70 20 53.527 w148 11 49 9 227.83 3203.10 3143.00 2.190 722062.81 5980236.15 n70 20 53.683 w148 11 49 244.91 3247.04 3186.94 2.158 722079.39 5980253.29 n70 20 53.847 w148 11 48 262.36 3290.62 3230.52 1.412 722096.32 5980271.01 n70 20 54.016 w148 11 48 280.39 3333.75 3273.65 2.726 722113.82 5980289.27 n70 20 54.190 w148 11 47 299.50 3376.25 3316.15 3.406 722132.38 5980307.96 n70 20 54.369 w148 11 47 319.83 3418.09 3357.99 3.000 722152.16 5980326.87 n70 20 54.549 w148 11 46 341.42 3459.19 3399.09 3.826 722173.20 5980346.05 n70 20 54.731 w148 11 46 364.33 3499.44 3439.34 3.475 722195.53 5980365.58 n70 20 54.917 w148 11 45 388.22 3538.96 3478.86 2.410 722218.85 5980385.44 n70 20 55.105 w148 11 44 412.87 3577.73 3517.63 3.085 722242.90 5980405.88 n70' 20 55.299 w148 11 44 438.09 3615.76 3555.66 2.372 722267.50 5980427.05 nT0 20 55.500 w148 11 43 463.76 3653.05 3592.95 3.053 722292.53 5980449.04 n70 20 55 709 w148 11 42 489.90 3689.53 3629.43 2.573 722318.00 5980471.84 n70 20 55 926 w148 11 41 516.45 3725.26 3665.16 2.571 722343.87 5980495.37 n70 20 56 150 w148 11 41 543.43 3760.27 3700.17 2.199 722370.14 5980519.53 n70 20 56 379 w148 11 40 570.71 3794.58 3734.48 2.547 722396.70 5980544.38 nT0 20 56 616 w148 11 39 598.24 3827.96 3767.86 3.798 722423.48 5980570.23 n70 20 56 862 w148 11 38 626.04 3860.31 3800.21 3.030 722450.49 5980597.13 n70 20 57 119 w148 11 37 654.22 3891.64 3831.54 3.323 722477.85 5980624.87 n70 20 57 384 w148 11 37 ( 682.94 3921.84 3861.74 3.225 722505.74 5980653.32 n70 20 57 655 w148 11 36 712.26 3950.85 3890.75 3.600 722534.22 5980682.43 n70 20 57 933 w148 11 35 742.22 3978.59 3918.49 3.460 722563.31 5980712.16 n70 20 58 217 w148 11 34 772.69 4005.35 3945.25 1.880 722592.90 5980742.30 n70 20 58 504 w148 11 33 803.49 4031.64 3971.54 0.873 722622.81 5980772.53 n70 20 58.793 w148 11 32.~ 834.57 4057.54 3997.44 1.387 722653.01 5980802.81 n70 20 59.082 w148 11 865.96 4082.73 4022.63 2.438 722683.51 5980833.39 n70 20 59.373 w148 11 30.1 897.71 4106.84 4046.74 3.288 722714.35 5980864.48 n70 20 59.670 w148 11 29.! 929.74 4129.87 4069.77 2.475 722745.45 5980896.14 n70 20 59.972 w148 11 28.! 961.86 4151.93 4091.83 2.737 722776.63 5980928.41 n70 21 0.280 w148 11 28.( 994.08 4172.95 4112.85 2.879 722807.89 5980961.28 n70 21 0.594 w148 11 27.( 946.83 1026.40 4192.95 4132.85 2.401 722839.24 5980994.71 n70 21 0.914 w148 11 26.~ 979.81 1058.84 4211.91 4151.81 2.923 722870.69 5981028.63 n70 21 1.238 w148 11 25.~ Well Definition Survey Details Report Operator: ARCO Field: Niakuk Well: NK-41A Date: 20:09, 06 Aug 98 Page: 4 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi (ft) (deg) (deg) 4850.00 69.45 44.08 4900.00 70.54 43.41 4950.00 71.13 43.20 5000.00 70.52 43.29 5100.00 71.21 43.60 5150.00 71.52 43.77 5200.00 70.95 43.79 5250.00 70.61 43.71 5300.00 71.03 43.73 5350.00 71.31 43.72 5400.00 71.76 44.04 5450.00 71.87 44.28 5500.00 71.30 44.17 5550.00 71.13 44.19 5600.00 70.91 44 05 5650.00 70.62 43 5700.00 70.30 43 5750.00 70.32 43 5800.00 70.33 42 5850.00 70.46 42 5900 00 71 72 41 5950 6000 6050 6100 6150 6200 6250 6300 6350 6400 6450 6500 6550 6600 00 72 00 72 00 73 00 73 00 73 00 73 59 40 89 40 34 41 07 41 51 41 69 41 00 72.91 41 00 72.80 41 00 72.50 41 00 72.12 41 00 72.02 41 00 71.70 41 00 72.07 41 00 72.28 41 72 46 09 88 44 57 85 94 07 01 16 3O 32 33 38 45 36 24 32 50 North (ft) 1013.24 1047.19 1081.55 1115,96 1184.55 1218.81 1252.99 1287.09 1321.22 1355.42 1389.61 1423.69 1457.68 1491.63 1525.57 1559.60 1593.73 1628.00 1662.44 1697.08 1732.23 1768.03 1804.13 1840.23 1876.34 1912.43 1948.51 1984.48 2020.36 2056.18 2091.91 2127.59 2163.28 2199.00 2234.70 East TVD(BRT) TVD(SS) (ft) 1091.39 1123.88 1156.27 1188.63 1253.59 1286.32 1319.07 1351.72 1384.36 1417.07 1449.94 1483.04 1516.13 1549.11 1582.03 1614.76 1647.25 1679.52 1711.62 1743.53 1775.19 1806.54 1837.80 1869.19 1900 62 1932 09 1963 71 1995 32 2026 87 2058 40 2089 91 2121.38 2152.74 2184.09 2215.57 (ft) 4229.88 4169.78 4246.98 4186.88 4263.40 4203.30 4279.82 4219.72 4312.60 4252.50 4328.58 4268.48 4344.66 4284.56 4361.12 4301.02 4377.55 4317.45 4393.69 4333.59 4409.52 4349 42 4425.13 4365 03 4440.92 4380 82 4457.02 4396 92 4473.28 4413 18 4489.76 4429 66 4506.48 4446 38 4523.33 4463 23 4540.16 4480 06 4556.94 4496 84 4573.14 4513 04 4588.46 4528 36 4603.30 4543 20 4617.82 4557 72 4632.27 4572 17 4646.65 4586.55 4660.76 4600.66 4675.13 4615.03 4689.87 4629.77 4704.78 4644.68 4719.97 4659.87 4735.37 4675.27 4750.93 4690.83 4766.48 4706.38 4781.79 4721.69 DLS (ft) (deg/100ft) 2.120 2.518 1.245 1.232 0.750 0.699 1.141 0.697 0.841 0.560 1.086 0.506 1.159 0.342 0.514 0.851 0.806 0.698 0.396 0.869 3 010 2 215 0 624 0 934 0 552 0 926 0.449 1.560 0.221 0.608 0.772 0.263 0.679 0.755 0.542 Easting (feet) 722902.23 722933.69 722965.05 722996.38 723059.28 723090.97 723122.70 723154.33 723185.94 723217.62 723249.47 723281.53 723313.60 723345.57 723377.46 723409.17 723440.63 723471.87 723502.94 723533.81 723564.41 723594.69 723624.87 723655.17 723685.52 723715.91 723746.44 723776.97 723807.44 723837.90 723868.34 723898.73 723929.02 723959.30 723989.71 Northing Latitude Longitu~ (feet) Deg Min Sec Deg Min 5981063.01 n70 21 1.567 w148 11 24 21 5981097.90 n70 21 1,901 w148 11 23 2: 5981133.21 n70 21 2.239 w148 11 22 5981168.55 n70 21 2.577 w148 11 21 31 5981239.03 n70 21 3.251 w148 11 19 4 5981274.24 n70 21 3.588 w148 11 18 5 5981309.38 n70 21 3.924 w148 11 17 5 5981344.43 n70 21 4.260 w148 11 16 6 5981379.51 n70 21 4.595 w148 11 15 6 5981414.66 n70 21 4.932 w148 11 14 7 5981449.81 n70 21 5.268 w148 11 13 7 5981484.85 n70 21 5.603 w148 11 12 7 5981519.80 n70 21 5 937 w148 11 11 8 5981554.71 n70 21 6 271 w148 11 10 8 5981589.61 n70 21 6 605 w148 11 9 8 5981624.59 n70 21 6 939 w148 11 8 9 5981659.66 n70 21 7 275 w148 11 7 9 5981694.88 n70 21 7 612 w148 11 7 5981730.25 n70 21 7 950 w148 11 6 5981765.82 n70 21 8 291 w148 11 5 5981801.89 n70 21 8 637 w148 11 4 5981838.60 n70 21 8 989 w148 11 3 5981875.60 n70 21 9.344 w148 11 2 5981912.62 n70 21 9.699 w148 11 1 5981949.64 n70 21 10.054 w148 11 0 5981986.65 n70 21 10.409 w148 10 59 5982023.64 n70 21 10.763 w148 10 58 5982060.53 n70 21 11 117 w148 10 57 5982097.33 n70 21 11 5982134.07 n70 21 11 5982170.71 n70 21 12 5982207.30 n70 21 12 5982243.91 n70 21 12 5982280.53 n70 21 13 5982317.15 n70 21 13 470 w148 10 56 822 w148 10 55 173 w148 10 55 524 w148 10 54 875 w148 10 53 226 w148 10 52 577 w148 10 51 Well Definition Survey Details Report Operator: ARCO Field: Niakuk Well: NK-41A Date: 20:09, 06 Aug 98 Page: 5 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi (ft) (deg) (deg) 6650.00 72.80 41.69 6700.00 72 77 41.90 6750.00 72 6800.00 71 6850.00 70 6900.00 69 6950.00 69 7000.00 69 7050.00 67 7100.00 68 7150.00 69 7200.00 70 34 42.07 97 42.14 80 42.34 97 42.45 50 42.39 13 42.43 87 42.38 25 42.29 39 42.36 20 42.30 7250.00 69.86 42.15 7300.00 70.82 42.11 7350.00 71.14 42.06 7400.00 71.97 42.02 7450.00 72.67 41.99 7500.00 71.93 41.77 7550.00 72.36 42.12 7600.00 72.21 43.06 7650.00 72.09 43.66 7700.00 72.16 44.34 7750 00 71.64 44.71 78OO 7850 7900 7950 8000 8050 8100 8150 8200 8250 8300 8350 00 72.11 45.05 00 71.74 45.11 00 71.54 45.29 00 71.66 45.60 00 71.74 45.79 00 72.30 46.36 00 72.00 46.86 00 72.45 47.00 00 72.58 46.95 00 72.22 46.63 00 72.35 46.78 00 72.43 47.38 North (ft) 2270.37 2305.97 2341.43 2376.74 2411.82 2446.60 2481.23 2515.77 2550.12 2584.40 2618.87 2653.56 2688.36 2723.28 2758.36 2793.58 2828.98 2864.45 2899.85 2934.91 2969.51 3003.74 3037.63 3071.30 3104.86 3138.30 3171.59 3204.74 3237.73 3270.43 3302.94 3335.48 3368.11 3400.78 3433.23 East TVD(BRT) TVD(SS) (ft) (ft) 2247.24 4796.79 4736.69 2279.07 4811.59 4751.49 2310.98 4826.57 4766.47 2342.89 4841.90 4781.80 2374.74 4857.86 4797.76 2406.50 4874.64 4814.54 2438.14 4891.96 4831.86 2469.68 4909.62 4849.52 2501.05 4927.95 4867.85 2532.29 4946.63 4886.53 2563.68 4964.69 4904.59 2595.28 4981.96 4921.86 2626.86 4999.04 4938.94 2658.45 5015.86 4955.76 2690.13 5032.15 4972.05 2721.89 5047.97 4987.87 2753.77 5063.16 5003.06 2785.57 5078.36 5018.26 2817.38 5093.69 5033.59 2849.61 5108.91 5048.81 2882.29 5124.23 5064.13 2915.34 5139.58 5079.48 2948.67 5155.11 5095.01 2982.20 5170.67 5110.57 3015.86 5186.18 5126.08 3049.53 5201 93 5141.83 3083.34 5217 3117 31 5233 3151 56 5248 3186 15 5264 3220 93 5279 3255 79 5294 3290 53 5309 3325 20 5324 3360 10 5339 71 5157.61 41 5173.31 85 5188.75 17 5204.07 44 5219.34 46 5234.36 58 5249.48 79 5264.69 92 5279.82 DLS (ft) (deg/100ft) 1.101 0.406 0.919 0 752 2 371 1 673 0 947 0 744 2 522 0 778 2 284 1.624 0.736 1.921 0.647 1.662 1.401 1.538 1.088 1.816 1.167 1.302 1.256 1.141 0.749 0.526 0.635 0.395 1.559 1 125 0 939 0 277 0 944 0 386 1 155 Easting (feet) 724020.30 724051.06 724081.91 724112.76 724143.56 724174.27 724204.87 724235.38 724265.72 724295.92 724326.28 724356.83 724387.37 724417.91 724448.54 724479.24 724510.06 724540.79 724571.54 724602.72 724634.35 724666.38 724698.69 724731.20 724763.85 724796.52 724829.32 724862.30 724895.56 724929.16 724962.96 724996.84 725030.60 725064.28 725098.20 Northing Latitude Longitu~ (feet) Deg Min Sec Deg Min S~ 5982353.73 n70 21 13.928 w148 10 50.4, 5982390.27 n70 21 14.278 w148 10 49 51 5982426.65 n70 21 14.627 w148 10 48 51 5982462.89 n70 21 14.974 w148 10 47 61 5982498.89 n70 21 15.319 w148 10 46 7 5982534.60 n70 21 15.661 w148 10 45 7 5982570.15 n70 21 16.001 w148 10 44 8 5982605.60 nT0 21 16.341 w148 10 43 9 5982640.86 n70 21 16.678 w148 10 43 0 5982676.05 nT0 21 17.016 w148 10 42 1 5982711.44 n70 21 17.354 w148 10 41 1 5982747.04 n70 21 17.695 w148 10 40 2 5982782.76 nT0 21 18.038 w148 10 39 3 5982818.60 n70 21 18.381 w148 10 38 4 5982854.60 nT0 21 18.726 w148 10 37 4 5982890.75 n70 21 19.072 w148 10 36.5 5982927.07 nT0 21 19.420 w148 10 35.~ 5982963.46 n70 21 19.769 w148 10 34.5 5982999.79 n70 21 20.117 w148 10 33.5 5983035.79 n70 21 20 462 w148 10 32.~ 5983071.34 n70 21 20 802 w148 10 31.~ 5983106.53 nT0 21 21 138 w148 10 30.~ 5983141.39 n70 21 21 471 w148 10 29.~ 5983176.03 n70 21 21 802 w148 10 28.[ 5983210.58 n70 21 22 132 w148 10 27.~ 5983245.00 n70 21 22 461 w148 10 26.~ 5983279 27 n70 21 22 5983313 5983347 5983381 5983414 5983448 5983481 5983515 5983548 41 n70 21 23 40 n70 21 23 11 n70 21 23 63 n70 21 24 19 n70 21 24 83 n70 21 24 50 n70 21 25 98 n70 21 25 788 w148 10 25 ~ 114 w148 10 25 ( 439 w148 10 24 ( 760 w148 10 22 ~ 080 w148 10 21 ~ 400 w148 10 20 ~ 720 w148 t0 19 ! 041 w148 10 18 ! 360 w148 10 17 ! Well Definition Survey Details Report Operator: ARCO Field: Niakuk Well: NK-41A Date: 20:09, 06 Aug 98 Page: 6 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi North East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longitu (ft) (deg) (deg) (ft) (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 8400.00 72.43 47.45 3465.49 3395.19 5355.01 5294.91 0.133 725132.33 5983582.25 nT0 21 25.677 w148 10 16 8 8450.00 71.98 47.26 3497.74 3430.21 5370.29 5310.19 0.970 725166.37 5983615.53 n70 21 25.995 w148 10 15 8 8500.00 71.77 47.34 3529.96 3465.13 5385.85 5325.75 0.447 725200.33 5983648.77 n70 21 26.311 w148 10 14 8 8550.00 72.32 47.47 3562.15 3500.15 5401.26 5341.16 1.127 725234.37 5983681.98 n70 21 26.628 w148 10 13 8 8600.00 72.23 47.67 3594.29 3535.30 5416.48 5356.38 0.421 725268.56 5983715.14 n70 21 26.944 w148 10 12 7 8650.00 72.86 48.19 3626.25 3570.71 5431.48 5371.38 1.604 725303.00 5983748.13 n70 21 27.258 w148 10 11 7 8700.00 72.58 48.37 3658.02 3606.34 5446.33 5386.23 0.657 725337.68 5983780.94 n70 21 27.570 w148 10 10 7 8750.00 72.41 48.45 3689.67 3642.01 5461.37 5401.27 0.373 725372.39 5983813.64 n70 21 27.881 w148 10 9 6 8800.00 72.54 48.48 3721.29 3677.70 5476.43 5416.33 0.266 725407.13 5983846.29 n70 21 28.192 w148 10 8 6 8850.00 72.40 48.32 3752.94 3713.35 5491.49 5431.39 0.414 725441.82 5983878.99 n70 21 28.503 w148 10 7 5 8900.00 72.45 48.15 3784.69 3748.91 5506.59 5446.49 0.339 725476.42 5983911.77 n70 21 28.815 w148 10 6 5 8950.00 72.08 48.13 3816.47 3784.37 5521.82 5461.72 0.741 725510.93 5983944.59 n70 21 29.128 w148 10 5 ~ 9000.00 72.47 48.26 3848.22 3819.88 5537.04 5476.94 0.818 725545.48 5983977.37 n70 21 29.440 w148 10 4 ~ 9050.00 72.63 48.41 3879.93 3855.51 5552.03 5491.93 0.429 725580.15 5984010.12 n70 21 29.751 w148 10 3.~ 9100.00 72.24 48.35 3911.59 3891.14 5567.12 5507.02 0.788 725614.84 5984042.82 n70 21 30.062 w148 10 2.~ 9150.00 72.22 48.21 3943.28 3926.68 5582.38 5522.28 0.270 725649.42 5984075.54 n70 21 30.374 w148 10 1.! 9200.00 72.48 48.41 3974.96 3962.26 5597.54 5537.44 0.645 725684.05 5984108.27 n70 21 30.685 w148 10 0.~ 9250.00 72.50 48.69 4006.53 3998.00 5612.59 5552.49 0.536 725718.83 5984140.88 n70 21 30.996 w148 9 59 ~ 9300.00 72.17 48.54 4038.03 4033.75 5627.76 5567.66 0.719 725753.63 5984173.42 n70 21 31.305 w148 9 58 1 9350.00 71.91 48.30 4069.59 4069.33 5643.18 5583.08 0.692 725788.26 5984206.02 n70 21 31.615 w148 9 57 1 9400.00 72.03 48.16 4101.26 4104.79 5658.65 5598.55 0.358 725822.76 5984238.73 n70 21 31.927 w148 9 56 9450.00 72.24 48.13 4133.02 4140.23 5673.99 5613.89 0.424 725857.25 5984271.52 n70 21 32.239 w148 9 55 9500.00 72.33 48.19 4164.79 4175.72 5689.21 5629.11 0.213 725891.78 5984304.32 n70 21 32.551 w148 9 54 9550.00 72.77 48.40 4196.52 4211.33 5704.20 5644.10 0.967 725926.43 5984337.09 n70 21 32.863 w148 9 53 9600.00 72.38 48.25 4228.24 4246.96 5719.17 5659.07 0.831 725961.11 5984369.85 n70 21 33.175 w148 9 51 9650.00 72.97 48.08 4260.08 4282.53 5734.06 5673.96 1.224 725995.71 5984402.73 n70 21 33.488 w148 9 50 9700.00 72.95 47.85 4292.09 4318.03 5748.71 5688.61 0.442 726030.25 5984435.77 n70 21 33.802 w148 9 49 9750.00 72.95 47.70 4324.21 4353.43 5763.37 5703.27 0.287 726064.68 5984468.93 n70 21 34.118 w148 9 48 9800.00 73.06 47.81 4356.36 4388.83 5777.99 5717.89 0.304 726099.11 5984502.11 n70 21 34.434 w148 9 47 9850.00 72.54 48.42 4388.25 4424.39 5792.77 5732.67 1.562 726133.71 5984535.03 n70 21 34.747 w148 9 46 9900.00 72.77 48.66 4419.85 4460.15 5807.68 5747.58 0.649 726168.53 5984567.68 n70 21 35.058 w148 9 45 9950.00 72.40 48.76 4451.33 4496.00 5822.64 5762.54 0.764 726203.42 5984600.20 n70 21 35.367 w148 9 44 10000.00 72.31 48.74 4482.75 4531.82 5837.80 5777.70 0.184 726238.30 5984632.67 n70 21 35.676 w148 9 43 10050.00 72.16 48.72 4514.15 4567.61 5853.06 5792.96 0.302 726273.14 5984665.12 n70 21 35.985 w148 9 42 10100.00 71.94 49.21 4545.38 4603.49 5868.47 5808.37 1.031 726308.08 5984697.39 n70 21 36.292 w148 9 41 Well Definition Survey Details Report Operator: ARCO Well: NK-41A Page: 7 Field: Niakuk Date: 20:09, 06 Aug 98 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi North East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longitu (ft) (deg) (deg) (ft) (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 10150.00 72.21 49.92 4576.24 4639.70 5883.85 5823.75 1.455 726343.36 5984729.30 n70 21 36.595 w148 9 40 4 10200.00 72.27 50.04 4606.86 4676.17 5899.11 5839.01 0.258 726378.90 5984760.99 n70 21 36.896 w148 9 39 10250.00 72.32 50.06 4637.44 4712.68 5914.31 5854.21 0.107 726414.49 5984792.64 n70 21 37.196 w148 9 38 10300.00 72.72 50.20 4668.01 4749.29 5929.33 5869.23 0.843 726450.17 5984824.28 n70 21 37.497 w148 9 37 10350.00 72.36 50.10 4698.58 4785.90 5944.33 5884.23 0.745 726485.87 5984855.91 n70 21 37.797 w148 9 36 10400.00 72.92 50.14 4729.18 4822.52 5959.25 5899.15 1.123 726521.56 5984887.58 n70 21 38.098 w148 9 35 10450.00 72.41 50.15 4759.76 4859.16 5974.15 5914.05 1.020 726557.28 5984919.24 n70 21 38.399 w148 9 34 10500.00 72.46 50.26 4790.27 4895.79 5989.24 5929.14 0.232 726592.99 5984950.82 n70 21 38.698 w148 9 32 10550.00 72.46 50.47 4820.68 4932.51 6004.31 5944.21 0.400 726628.78 5984982.30 n70 21 38.997 w148 9 31 10600.00 72.02 50.43 4851.00 4969.22 6019.56 5959.46 0.883 726664.59 5985013.69 n70 21 39.295 w148 9 30 10650.00 72.43 50.39 4881.35 5005.91 6034.82 5974.72 0.824 726700.36 5985045.11 n70 21 39.593 w148 9 29 10700.00 72.76 50.39 4911.77 5042.67 6049.78 5989.68 0.660 726736.20 5985076.60 n70 21 39.892 w148 9 28 10750.00 72.91 50.49 4942.19 5079.50 6064.53 6004.43 0.356 726772.11 5985108.10 n70 21 40.191 w148 9 27 10800.00 72.98 50.60 4972.57 5116.41 6079 20 6019.10 0.253 726808.10 5985139.55 n70 21 40.490 w148 9 26 10850.00 72.60 50 95 5002.77 5153.41 6093 10900.00 72.60 51 10950.00 73.37 51 11000.00 73.80 51 11050.00 73 30 50 11100 00 72 11150 11200 11250 11300 11350 11400 00 73 00 74 00 74 00 73 00 73 00 74 11450.00 74 9O 5O 77 50 29 51 40 51 8O 51 64 51 53 51 77 52 18 5032.76 5190.52 6108 37 5062.67 5227.82 6123 29 5092.63 5265.27 6137 47 5122.89 5302.47 6151 35 5153.38 5339.34 6166 76 5183.81 5376.33 6180 34 5214.03 5413.71 6194 61 5244.01 5451.38 6207 62 5273.87 5489.07 6221 88 5303.59 5526.76 6235 97 5333.24 5564.61 6249 11 5362.90 5602.63 6262 11500.00 75 29 52.13 5392.56 5640.75 6275 11550.00 75.14 52.41 5422.14 5678.99 6288 11600.00 74.57 52.68 5451.49 5717.30 6301 11650.00 74.50 52.83 5480.66 5755.66 6314 11700.00 74.28 52.81 5509.76 5794.03 6328 11750.00 74.58 52.61 5538.94 5832.35 6341 11800.00 73.94 52.10 5568.33 5870.46 6355 11850.00 74.24 51.99 5597.91 5908.37 6368 99 6033.89 1.012 726844.19 5985170.84 n70 21 40.787 w148 9 25 95 6048.85 0.439 726880.40 5985201.91 n70 21 41.081 w148 9 24 58 6063.48 1.582 726916.79 5985232.90 n70 21 41.375 w148 9 23 71 6077.61 0.874 726953.34 5985263.97 n70 21 41.670 w148 9 22 86 6091.76 1.864 726989.63 5985295.31 n70 21 41.967 w148 9 21 40 6106.30 0.832 727025.57 5985326.87 n70 21 42.266 w148 9 20 74 6120.64 1.909 727061.64 5985358.39 n70 21 42 565 w148 9 18 50 6134.40 1.525 727098.12 5985389.70 n70 21 42 99 6147.89 0.565 727134.88 5985420.78 n70 21 43 69 6161.59 1.200 727171.67 5985451.74 n70 21 43 70 6175.60 0.593 727208.46 5985482 56 n70 21 43 41 6189.31 1.788 727245.42 5985513 32 n70 21 44 65 6202.55 0.551 727282.53 5985544 09 n70 21 44 56 6215.46 1.041 727319.76 5985574 86 n70 21 44 32 6228.22 0.619 727357.11 5985605 56 n70 21 44 39 6241.29 1.254 727394.53 5985636 03 n70 21 45 72 6254.62 0.321 727432.01 5985666 32 n70 21 45 17 6268.07 0.442 727469.50 5985696 54 n70 21 45 59 6281.49 0.713 727506.93 5985726 84 n70 21 46 16 6295.06 1.613 727544.15 5985757.35 n70 21 46 86 6308.76 0.636 727581.17 5985788.03 n70 21 46 862 w148 9 17 157 w148 9 16 450 w148 9 15 742 w148 9 14 034 w148 9 13.4 325 w148 9 12.2 617 w148 9 11.] 907 w148 9 10.C 196 w148 9 8 ~ 482 w148 9 7 ~ 768 w148 9 6 5 055 w148 9 5 5 344 w148 9 4 ~ 634 w148 9 3 2 Well Definition Survey Details Report Operator: ARCO Well: NK-41A Page: 8 Field: Niakuk Date: 20:09, 06 Aug 98 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi North East TVD(BRT) TVD(SS)' DLS Easting Northing Latitude Longitu (ft) (deg) (deg) (ft) (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 11900.00 74.07 52.32 5627.42 5946.36 6382.52 6322.42 0.720 727618.26 5985818.65 n70 21 46.924 w148 9 2 2 11950.00 73.90 52.37 5656.78 5984.40 6396.31 6336.21 0.353 727655.43 5985849.12 n70 21 47 212 w148 9 1 12000.00 73.98 52.44 5686.09 6022.47 6410.14 6350.04 0.209 727692.61 5985879.55 n70 21 47 12050.00 73.79 52.79 5715.26 6060.64 6424.02 6363.92 0.772 727729.90 5985909.83 n70 21 47 12100.00 73.79 52.47 5744.40 6098.80 6437.98 6377.88 0.615 727767.17 5985940.09 n70 21 48 12150.00 73.71 51.81 5773.86 6136.70 6451.97 6391.87 1.277 727804.18 5985970.65 n70 21 48 12200.00 73.57 51.27 5803.70 6174.26 6466.05 6405.95 1.073 727840.85 5986001.59 n70 21 48 12250.00 74.13 51.07 5833.81 6211.68 6479.96 6419.86 1.184 727877.35 5986032.80 n70 21 48 12300.00 73.86 50.25 5864.28 6248.85 6493.75 6433.65 1.666 727913.60 5986064.35 n70 21 49 12350.00 73.90 50.18 5895.01 6285.76 6507 63 6447.53 0.156 727949.58 5986096.16 n70 21 49 12400.00 73.69 50.24 5925.74 6322.65 6521 12450.00 73.24 50.24 5956.40 6359.50 6535 12500.00 73.49 50.28 5987.03 6396.34 6550 12550.00 72 80 50.38 6017.57 6433.17 6564 12600.00 72.51 50.71 6047.90 6470.02 6579 12650.00 72 62 51.10 6077.98 6507.04 6594 12700.00 72.23 51.21 6107.88 6544.17 6609 58 6461.48 0.436 727985.55 5986127.97 n70 21 49 81 6475.71 0.900 728021.47 5986159.70 n70 21 50 13 6490.03 0.506 728057.39 5986191.40 n70 21 50 63 6504.53 1.393 728093.30 5986223.03 n70 21 50 53 6519.43 0.856 728129.23 5986254.43 n70 21 51 51 6534.41 0.776 728165.35 5986285.59 n70 21 51 61 6549.51 0.808 728201.57 5986316.58 n70 21 51 500 w148 9 0 787 w148 8 58 073 w148 8 57 363 w148 8 56 656 w148 8 55 952 w148 8 54 251 w148 8 53 553 w148 8 52 855 w148 8 51 156 w148 8 50 457 w148 8 49 757 w148 8 48 055 w148 8 46 351 w148 8 45 644 w148 8 44 937 w148 8 43 230 w148 8 42 523 w148 8 41 816 w148 8 40 112 w148 8 39 12750.00 72 22 51.19 6137.71 6581.28 6624.88 6564.78 0.043 728237.77 5986347.49 n70 21 51 12800.00 72.15 51.27 6167.52 6618.39 6640.17 6580.07 0.207 728273.99 5986378.39 n70 21 52 12850.00 71 61 51.15 6197.29 6655.43 6655.72 6595.62 1.104 728310.13 5986409.24 n70 21 52 12900.00 71.87 51.07 6227.10 6692.39 6671.39 6611.29 0.542 728346.18 5986440.13 n70 21 52 12950.00 71 40 50.00 6257.26 6729.02 6687.14 6627.04 2.238 728381.91 5986471.36 n70 21 53 13000.00 71.63 49.38 6287.94 6765.18 6703.00 6642.90 1.263 728417.14 5986503.09 n70 21 53.413 w148 8 38.~ 13050.00 71 71 49.59 6318.78 6801.26 6718.72 6658.62 0.430 728452.30 5986534.98 n70 21 53.716 w148 8 37 ~ 13100.00 71.50 49.13 6349.68 6837.27 6734.50 6674.40 0.969 728487.37 5986566.93 n70 21 54.020 w148 8 36 ] 13150.00 71.70 49.09 6380.73 6873.13 6750.28 6690.18 0.407 728522.30 5986599.03 n70 21 54.325 w148 8 35 ~ 13200.00 71.34 49.00 6411.82 6908.95 6766.13 6706.03 0.740 728557.17 5986631.16 n70 21 54.630 w148 8 34 ( 13250.00 71.29 49.04 6442.88 6944.70 6782.15 6722.05 0.125 728591.99 5986663.27 n70 21 54.935 w148 8 33 ( 13300.00 71.00 48.85 6473.96 6980.38 6798.31 6738.21 0.682 728626.74 5986695.39 n70 21 55.241 w148 8 31 ~ 13350.00 71.69 48.63 6505.20 7016.00 6814.30 6754.20 1.442 728661 41 5986727.67 n70 21 55 548 w148 8 30 ~ 13400.00 71.91 48.50 6536.63 7051.61 6829.92 6769.82 0.505 728696 07 5986760.14 n70 21 55 856 w148 8 29 ~ 13450.00 71.46 48.65 6568.04 7087.20 6845.63 6785.53 0.944 728730 71 5986792.58 n70 21 56 165 w148 8 28 ~ 13500.00 71.71 48.74 6599.35 7122.83 6861.42 6801.32 0.528 728765 41 5986824.94 n70 21 56 473 w148 8 27 ~ 13550.00 72.13 48.85 6630.66 7158.60 6876.94 6816.84 0.866 728800 22 5986857.29 n70 21 56 780 w148 8 26 ~ 13600.00 72.23 48.78 6662.01 7194.42 6892.24 6832.14 0.240 728835 10 5986889.68 n70 21 57 088 w148 8 25 [ Well Definition Survey Details Report Operator: ARCO Well: NK-41A Page: 9 Field: Niakuk Date: 20:09, 06 Aug 98 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi North East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longitu (ft) (deg) (deg) (ft) (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 13650.00 72.14 48 86 6693.35 7230.25 6907.54 6847.44 0.236 728869.98 5986922.07 n70 21 57.396 w148 8 24 6 13700.00 72.28 48 86 6724.67 7266.10 6922.82 6862.72 0.280 728904.89 5986954.44 n70 21 57.704 w148 8 23 6 13750.00 72.99 49 05 6756.01 7302.09 6937.74 6877.64 1.466 728939.94 5986986.82 n70 21 58.012 w148 8 22 5 13800.00 72.60 49 01 6787.32 7338.16 6952.53 6892.43 0.784 728975.06 5987019.19 n70 21 58.319 w148 8 21 5 13850.00 72.45 48 98 6818.61 7374.15 6967.54 6907.44 0.305 729010.11 5987051.53 n70 21 58.627 w148 8 20 4 13900.00 72.06 48 95 6849.88 7410.07 6982.78 6922.68 0.782 729045.08 5987083.85 n70 21 58.934 w148 8 19 4 13950.00 71.73 48 96 6881.09 7445.91 6998.32 6938.22 0.660 729079.99 5987116.10 n70 21 59.240 w148 8 18 3 14000.00 71.93 49 35 6912.16 7481.85 7013.91 6953.81 0.842 729114.99 5987148.22 n70 21 59.546 w148 8 17 3 14050.00 72.27 49 76 6943.02 7518.06 7029.28 6969.18 1.035 729150.27 5987180.14 n70 21 59.849 w148 8 16 2 14100.00 72.28 49 72 6973.80 7554.40 7044.50 6984.40 0.079 729185.68 5987211.98 n70 22 0.151 w148 8 15 1 14150.00 71.97 49 98 7004.48 7590.78 7059.85 6999.75 0.793 729221.13 5987243.72 n70 22 0.453 w148 8 14 1 14200.00 72.31 50 31 7034.98 7627.31 7075.18 7015.08 0.926 729256.74 5987275.29 n70 22 0.752 w148 8 13 0 14250.00 72.72 50.55 7065.36 7664.07 7090.21 7030.11 0.939 729292.59 5987306.74 n70 22 1.051 w148 8 11 9 14300.00 72.21 50.54 7095.66 7700.88 7105.27 7045.17 1.020 729328.48 5987338.11 n70 22 1.348 w148 8 10 8 14350.00 72.15 50.33 7125.98 7737.58 7120.57 7060.47 0.417 729364.26 5987369.50 n70 22 1.646 w148 8 9 ~ 14400.00 71.86 50.42 7156.31 7774.21 7136.02 7075.92 0.605 729399.98 5987400.90 n70 22 1.944 w148 8 8 ~ 14450.00 72.03 50.43 7186.59 7810.85 7151.52 7091.42 0.341 729435.70 5987432.26 n70 22 2.241 w148 8 7 ~ 14500.00 72.77 50.62 7216.89 7847.64 7166.63 7106.53 1.524 729471.58 5987463.63 n70 22 2.539 w148 8 6 ~ 14550.00 72.25 50.74 7247.11 7884.53 7181.66 7121.56 1.065 729507.56 5987494.93 n70 22 2.836 w148 8 5 ~ 14600.00 72.32 50.94 7277.18 7921.46 7196.88 7136.78 0.406 729543.58 5987526.08 n70 22 3.131 w148 8 4 ~ 14650.00 72.08 50.98 7307.17 7958.44 7212.16 7152.06 0.486 729579.65 5987557.15 n70 22 3.426 w148 8 3 2 14700.00 71.81 50.96 7337.11 7995.36 7227.66 7167.56 0.541 729615.68 5987588.16 n70 22 3.720 w148 8 2.~ 14750.00 72.07 51.09 7367.01 8032.32 7243.16 7183.06 0.576 729651.73 5987619.14 n70 22 4.013 w148 8 1.~ 14800.00 71.57 51.38 7396.75 8069.36 7258.76 7198.66 1.142 729687.87 5987649.97 n70 22 4.305 w148 8 0.[ 14850.00 72.20 51.37 7426.41 8106.49 7274.30 7214.20 1.260 729724.10 5987680.71 n70 22 4.597 w148 7 59.( 14900.00 72.56 51.75 7456.04 8143.81 7289.44 7229.34 1.021 729760.53 5987711.43 n70 22 4.888 w148 7 57.! 14950.00 72.10 51.87 7485.49 8181.26 7304.62 7244.52 0.948 729797.09 5987741.98 n70 22 5 177 w148 7 56 I 15000.00 72.54 51.91 7514.90 8218.74 7319.80 7259.70 0.883 729833.68 5987772.48 n70 22 5 15050.00 72.50 51.81 7544.35 8256.25 7334.82 7274.72 0.207 729870.30 5987803.03 n70 22 5 15100.00 72.18 51.89 7573.78 8293.71 7349 99 7289.89 0.658 729906.88 5987833.55 n70 22 6 15150.00 72.12 52.42 7602.98 8331.30 7365 31 7305.21 1.016 729943.58 5987863.85 n70 22 6 15200.00 72.39 52.51 7631.99 8369.06 7380 55 7320.45 0.567 729980.46 5987893.97 n70 22 6 15250.00 72.97 52.78 7660.95 8407.00 7395 44 7335.34 1.269 730017.53 5987924.04 n70 22 6 15300.00 72.93 52.93 7689.82 8445.11 7410 10 7350.00 0.298 730054.76 5987954.01 nT0 22 7 15350.00 72.57 53.16 7718.53 8483.26 7424 93 7364.83 0.843 730092.05 5987983.84 n70 22 7 466 w148 7 55 755 w148 7 54 044 w148 7 53 331 w148 7 52 616 w148 7 51 900 w148 7 50 184 w148 7 49 466 w148 7 47 Well Definition Survey Details Report Operator: ARCO Well: NK-41A Page: 10 Field: Niakuk Date: 20:09, 06 Aug 98 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi North East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longitu (ft) (deg) (deg) (ft) (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 15400.00 72.96 53.28 7747.12 8521.51 7439.74 7379.64 0.813 730129.43 5988013.55 n70 22 7 746 w148 7 46 8 15450.00 72.30 53.45 7775.59 8559.81 7454.67 7'394.57 1.359 730166.87 5988043.14 n70 22 8 026 w148 7 45 15500.00 71.96 53.52 7803.91 8598.05 7470.01 7.409.91 0.693 730204.26 5988072.58 n70 22 8 304 w148 7 44 15550.00 71.80 53.58 7832.14 8636.28 7485.56 7425.46 0.340 730241.63 5988101.93 n70 22 8 581 w148 7 43 15600.00 71.82 53.36 7860.42 8674.45 7501.17 7441.07 0.420 730278.94 5988131.32 n70 22 8 859 w148 7 42 15650.00 72.39 53.11 7888.90 8712.56 7516.53 7456.43 1.235 730316.19 5988160.91 n70 22 9 139 w148 7 41 15700.00 72.51 52.85 7917.60 8750.63 7531.61 7471.51 0.551 730353.39 5988190.73 n70 22 9 420 w148 7 40 15750.00 72.53 52.76 7946.43 8788.62 7546.63 7486.53 0.176 730390.51 5988220.67 n70 22 9 703 w148 7 39 15800.00 72.30 52.77 7975.27 8826.56 7561.73 7501.63 0.460 730427.58 5988250.62 n70 22 9 987 w148 7 37 15850.00 72.20 52.70 8004.11 8864.46 7576.98 7516.88 0.240 730464.61 5988280.56 n70 22 10.270 w148 7 36 15900.00 72.59 51.86 8033.26 8902.16 7592.10 7532.00 1.781 730501.43 5988310.82 n70 22 10.556 w148 7 35 15950.00 72.48 51.12 8062.96 8939.48 7607.11 7547.01 1.429 730537.85 5988341.61 n70 22 10.848 w148 7 34 16000.00 72.50 51.22 8092.86 8976.63 7622.15 7562.05 0.195 730574.09 5988372 59 n70 22 11.141 w148 7 33 16050.00 72.51 51.24 8122.72 9013.81 7637.18 7577.08 0.043 730610.37 5988403 54 n70 22 11 435 w148 7 32 16100.00 72.36 51.19 8152.58 9050.96 7652.27 7592.17 0.315 730646.63 5988434 48 n70 22 11 728 w148 7 31 16150.00 72.52 50.97 8182.53 9088.05 7667.36 7607.26 0.528 730682.81 5988465 51 n70 22 12 022 w148 7 30 16200.00 72.07 50.75 8212.59 9124.99 7682.56 7622.46 0.993 730718.85 5988496 66 n70 22 12 317 w148 7 29 16250.00 72 15 50 69 8242.72 9161.83 7697.92 7637.82 0.197 730754.77 5988527 86 n70 22 12 613 w148 7 28 16300.00 71 92 50 53 8272.90 9198.58 7713.34 7653.24 0.552 730790.62 5988559 12 n70 22 12 909 w148 7 27 16350.00 72 20 50 47 8303.16 9235.29 7728.74 7668.64 0.572 730826.41 5988590.45 n70 22 13 206 w148 7 25 16400.00 72 65 50 39 8333.52 9272.03 7743.84 7683.74 0.913 730862.23 5988621.88 n70 22 13 505 w148 7 24 16450.00 72 37 50 26 8363.97 9308.74 7758.87 7698.77 0.612 730898.02 5988653.40 n70 22 13 804 w148 7 23 16500.00 72 65 50 22 8394.47 9345.40 7773.90 7713.80 0.565 730933.76 5988684.97 n70 22 14 103 w148 7 22 16550.00 72 82 50 04 8425.08 9382.04 7788.74 7728.64 0.484 730969.48 5988716.65 n70 22 14 404 w148 7 21 16600.00 73 02 49 99 8455.79 9418.66 7803.42 7743.32 0.411 731005.17 5988748.43 n70 22 14 705 w148 7 20 16650.00 73 02 49 91 8486.56 9455.27 7818.02 7757.92 0.153 731040.85 5988780.27 n70 22 15 007 w148 7 19 16700.00 72 74 49 81 8517.36 9491.80 7832.74 7772.64 0.592 731076.45 5988812.14 n70 22 15 310 w148 7 18 16750.00 72.84 49 67 8548.23 9528.25 7847.54 7787.44 0.334 731111.97 5988844.07 n70 22 15 613 w148 7 17 16800.00 72.58 49 59 8579.15 9564.62 7862.40 7802.30 0.542 731147.41 5988876.05 nT0 22 15 917 w148 7 16 16850.00 72.25 49 77 8609.99 9600.96 7877.50 7817.40 0.744 731182.82 5988907.96 n70 22 16 220 w148 7 15 16900.00 72.33 49.73 8640.77 9637.31 7892.71 7832.61 0.177 731218.24 5988939.79 n70 22 16 522 w148 7 14 16950.00 72.48 50.26 8671.41 9673.82 7907.83 7847.73 1.054 731253.83 5988971.50 n70 22 16 823 w148 7 13 17000.00 72.52 50.26 8701.89 9710.49 7922.86 7862.76 0.080 731289.57 5989003.05 n70 22 17 122 w148 7 12 17050.00 72.92 50.32 8732.40 9747.22 7937.71 7877.61 0.808 731325.38 5989034.63 n70 22 17.422 w148 7 10 17100.00 72.66 50.34 8762.89 9783.98 7952.51 7892.41 0.521 731361.22 5989066.19 n70 22 17.721 w148 7 9. Well Definition Survey Details Report Operator: ARCO Well: NK-41A Page: 11 Field: Niakuk Date: 20:09, 06 Aug 98 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North 18040.00 69 18131.90 69 18221.60 69 18319.80 69 18413.70 69 18512.80 69 18603.30 68 MD Inc Azi North East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longitu (ft) (deg) (deg) (ft) (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 17150.00 72.72 50.26 8793.38 9820.71 7967.38 7907.28 0.194 731397.03 5989097.75 nT0 22 18 020 w148 7 8 8 17200.00 72.35 50.14 8823.91 9857.35 7982.39 7922.29 0.775 731432.75 5989129.35 n70 22 18 320 w148 7 7 7 17250.00 72.38 50.16 8854.44 9893.93 7997.54 7937.44 0.071 731468.41 5989160.96 nT0 22 18 620 w148 7 6 6 17300.00 72.40 50.01 8885.02 9930.49 8012.66 7952.56 0.289 731504.04 5989192.60 nT0 22 18 920 w148 7 5 6 17350.00 72.16 50.04 8915.62 9966.99 8027.88 7967.78 0.483 731539.62 5989224.27 n70 22 19 221 w148 7 4 5 17400.00 72.48 49.98 8946.23 10003.48 8043.07 7982.97 0.650 731575.19 5989255.95 nT0 22 19 521 w148 7 3 ~ 17450.00 72.11 49.95 8976.87 10039.95 8058.27 7998.17 0.742 731610.74 5989287.65 n70 22 19 822 w148 7 2 ~ 17500.00 72.43 49.97 9007.51 10076.41 8073.50 8013.40 0.641 731646.28 5989319.35 n70 22 20 123 w148 7 1 2 17550.00 71.92 49.95 9038.13 10112.86 8088.81 8028.71 1.021 731681.79 5989351.04 n70 22 20 424 w148 7 0 ~ 17600.00 72.12 50.01 9068.71 10149.28 8104.24 8044.14 0.416 731717.29 5989382.68 n70 22 20 724 w148 6 59 ~ 17650.00 71.76 50.02 9099.26 10185.70 8119.74 8059.64 0.720 731752.79 5989414.29 n70 22 21 024 w148 6 58 17700.00 71.71 51.06 9129.44 10222.36 8135.41 8075.31 1.978 731788.54 5989445.54 n70 22 21 320 w148 6 57 17750.00 71.73 52.03 9158.96 10259.54 8151.10 8091.00 1.843 731824.83 5989476.15 n70 22 21 610 w148 6 55 17800.00 71.34 53.27 9187.73 10297.24 8166.93 8106.83 2.478 731861.66 5989506.03 n70 22 21.892 w148 6 54 17850.00 70.99 53.97 9215.80 10335.34 8183.07 8122.97 1.499 731898.91 5989535.21 n70 22 22 168 w148 6 53 17946.10 70 32 55 50 9268.15 10409.37 8214.91 8154.81 1.656 731971.35 5989589.73 n70 22 22 682 w148 6 51 99 58 00 9316.58 10483.22 8246.79 8186.69 2.529 732043.74 5989640.31 n70 22 23 157 w148 6 49 61 60 90 9360.41 10557.48 8278.53 8218.43 2.990 732116.67 5989686.33 n70 22 23 587 w148 6 47 19 63 40 9399.64 10631.72 8310.09 8249.99 2.651 732189.70 5989727.73 nT0 22 23 972 w148 6 45 23 66 10 9438.79 10714.74 8344.96 8284.86 2.571 732271.53 5989769.32 nT0 22 24 356 w148 6 42 89 68 70 9472.60 10795.96 8377.75 8317.65 2.688 732351.71 5989805.51 nT0 22 24.687 w148 6 40 86 71.20 9504.50 10883.37 8411.85 8351.75 2.369 732438.13 5989839.98 nT0 22 25 000 w148 6 37 94 73.80 9529.97 10964.15 8443.70 8383.60 2.875 732518.11 5989867.84 n70 22 25 18698.90 68.55 76.60 9552.73 11050.28 8478.36 8418.26 2.760 732603.53 5989893.14 n70 22 25 18792.80 68.12 79.70 9570.65 11135.67 8513.04 8452.94 3.102 732688.35 5989913.58 n70 22 25 18887.90 68.33 82.20 9584.54 11222.87 8548.32 8488.22 2.451 732775.10 5989930.04 n70 22 25 18983.00 68.86 82.50 9596.33 11310.63 8583.03 8522.93 0.630 732862.46 5989944.42 n70 22 25 19074.40 69.35 82.90 9607.18 11395.32 8615.63 8555.53 0.674 732946.80 5989957.77 n70 22 26 19170.00 69.69 83.20 9618.01 11484.22 8649.07 8588.97 0.461 733035.33 5989971.23 n70 22 26 19260.20 70.08 83.50 9627.82 11568.35 8680.09 8619.99 0.533 733119.13 5989983.53 n70 22 26 19355.20 70.39 84.20 9637.40 11657.24 8712.22 8652.12 0.766 733207.69 5989995.73 n70 22 26 19448.30 70.77 83.50 9646.81 11744.54 8743.18 8683.08 0.818 733294.67 5990007.72 n70 22 26 19542.20 71.22 83.90 9656.55 11832.78 8773.75 8713.65 0.626 733382.58 5990020.06 n70 22 26 19634.40 70.61 83.10 9666.41 11919.35 8803.90 8743.80 1.054 733468.82 5990032.48 n70 22 26 19729.50 71.14 82.90 9677.36 12008.53 8835.06 8774.96 0.592 733557.63 5990046.07 n70 22 26 249 w148 6 35 472 w148 6 32 647 w148 6 30 782 w148 6 27 896 w148 6 25 002 w148 6 22 107 w148 6 20 202 w148 6 17 295 w148 6 15 386 w148 6 12 481 w148 6 9 576 w148 6 7 683 w148 6 4 Well Definition Survey Details Report Operator: ARCO Well: NK-41A Page: 12 Field: Niakuk Date: 20:09, 06 Aug 98 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi North East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longituf (ft) (deg) (deg) (ft) (ft)' (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min Se 19825 70 70.50 81 30 9689.85 12098.53 8866.67 8806.57 1.706 733647.21 5990061.21 n70 22 26 804 w148 6 2 id 19920 20011 20105 20199 20293 20384 20480 40 70.92 80 00 71.48 81 90 69.81 83 30 70.23 83 20 70.71 83 9O 70.5O 84 70 70.41 84 20573.90 70.25 83 20666.70 70.16 82 20760.40 70.32 82 20853.80 70.22 82 20945.90 70.55 82 21040.10 70.50 83 21137.20 70.38 83 21232.00 69.98 81 21327.40 69.98 80 21422.10 70.10 81 21517 30 70.44 82 21607 30 70.52 82 21704 20 70.59 82 21798 70 69.91 81 21894 60 69.50 81 21991 00 70.35 79 30 9704.14 12186.76 8897.95 8837.85 1.091 733734,98 5990078.11 n70 22 26 70 9717.55 12271.47 8927.15 8867.05 1.588 733819.25 5990094.02 n70 22 27 80 9728.86 12360.28 8958.60 8898.50 2.730 733907.68 5990107.95 n70 22 27 40 9738.64 12447.51 8990.52 8930.42 0.603 733994.58 5990120.32 n70 22 27 80 9748.51 12535.45 9021.91 8961.81 0.650 734082.19 5990132.78 n70 22 27 40 9757.40 12621.49 9052 36 8992.26 0.658 734167.92 5990144.21 n70 22 27 30 9766.29 12711.33 9084 41 9024.31 0.136 734257.46 5990155.76 n70 22 27 80 9775.39 12798.62 9115 78 9055.68 0.534 734344.44 5990167.43 n70 22 27 943 w148 5 59 074 w148 5 57 183 w148 5 54 278 w148 5 51 374 w148 5 49 460 w148 5 46 546 w148 5 44 634 w148 5 41 40 9785.88 12885.30 9147 90 9797.16 12972.76 9178 60 9808.25 13059.97 9210 70 9819.35 13146.02 9241 20 9830.25 13234.15 9272 20 9841.08 13325.01 9305 21 9087.11 1.423 734430.76 5990180.48 n70 22 27.735 w148 5 39 89 9118.79 0.530 734517.85 5990194.35 n70 22 27.845 w148 5 36 42 9150.32 0.321 734604.69 5990208.02 n70 22 27.953 w148 5 34 34 9181.24 0.373 734690.36 5990221.66 n70 22 28.060 w148 5 31 74 9212.64 0.503 734778.13 5990235.16 n70 22 28.166 w148 5 28 25 9245.15 0.124 734868.62 5990248.68 n70 22 28.271 w148 5 26 30 9853.11 13413.37 9337.40 9277.30 1.932 734956.59 5990263 31 n70 22 28.388 w148 5 23 70 9867.13 13501.90 9370.06 9309.96 0.591 735044.66 5990279 20 9881.13 13589.81 9402.38 9342.28 0.512 735132.11 5990296 20 9894.07 13678.48 9434.52 9374.42 1.051 735220.35 5990312 60 9905.28 13762.56 9464.60 9404.50 0.428 735304.06 5990325 40 9917.21 13853.15 9496.85 9436.75 0 208 735394.26 5990340 30 9929.82 13941.19 9528.79 9468.69 1 311 735481.88 5990355 40 9943.35 14030.11 9562.05 9501.95 0 30 9958.53 14119.37 9595.14 9535.04 2 95 n70 22 28 524 w148 5 21 54 n70 22 28 10 n70 22 28 80 n70 22 28 40 n70 22 29 61 n70 22 29 439 735570.36 5990371.76 n70 22 29 228 735659.12 5990389.58 n70 22 29 660 w148 5 18 786 w148 5 15 894 w148 5 13 010 w148 5 10 132 w148 5 8 264 w148 5 5 412 w148 5 3 22080 30 70.67 80.10 9973.58 14202.19 9624.94 9564.84 0 917 735741.46 5990407.07 n70 22 29 22176 00 70.82 80.60 9988.72 14291.26 9656.50 9596.40 0 518 735830.04 5990424.85 nT0 22 29 22269 50 70.97 80.10 10003.53 14378.36 9687.10 9627.00 0 530 735916.66 5990442.23 n70 22 29 22365 60 70.53 80.40 10018.90 14467.78 9718.78 9658.68 0 545 736005.58 5990460.23 n70 22 29 22461 20 70.92 81.20 10033.32 14556.86 9750.34 9690.24 0.889 736094.19 5990477.29 n70 22 30 22555.10 71.31 81.20 10046.92 14644.66 9780.73 9720.63 0 415 736181.54 5990493.47 n70 22 30 22649.80 71.68 81.50 10060.42 14733.44 9810.79 9750.69 0 493 736269.88 5990509.60 n70 22 30 22740.80 71.17 81.30 10073.32 14818.73 9839.78 9779.68 0 598 736354.75 5990525.02 n70 22 30 22838.30 70.79 82.10 10086.63 14909.94 9871.55 9811.45 0 868 736445.52 5990541.02 nT0 22 30 23022.50 71.34 80.20 10113.44 15082.09 9931.33 9871.23 1 020 736616.79 5990572.91 n70 22 30 23111.50 72.94 80.70 10127.49 15165.62 9958.63 9898.53 1 876 736699.87 5990589.42 n70 22 31 558 w148 5 0 705 w148 4 57 849 w148 4 55 999 w148 4 52 139 w148 4 50 271 w148 4 47 402 w148 4 45 527 w148 4 42 656 w148 4 39 916 w148 4 34 053 w148 4 32 5~ 0~ 4~ 92 3~ 6( 5( 4~ 9~ 2! 6' 0' 5~ 9~ 4 8 2 6 0 5 9 4 8 2 6 0 5 8 8 3 Well Definition Survey Details Report Operator: ARCO Well: NK-41A Page: 13 Field: Niakuk Date: 20:09, 06 Aug 98 Description : Final Definitive Survey Ail Azimuths are relative to TRUE North MD Inc Azi North East TVD(BRT) TVD(SS) DLS Easting Northing Latitude Longitu (ft) (deg) (deg) (ft) (ft) (ft) (ft) (deg/100ft) (feet) (feet) Deg Min Sec Deg Min S 23210.10 74.12 80.50 10142.93 15258.90 9986.58 9926.48 1.212 736792.65 5990607.62 n70 22 31.203 w148 4 29.6 23300.90 73.44 80.60 10157.25 15344.90 10011.94 9951.84 0.756 736878.18 5990624.48 nT0 22 31.342 w148 4 27.1 23397.80 73.79 80.30 10172.67 15436.58 10039.28 9979.18 0.468 736969.36 5990642.60 n70 22 31.492 w148 4 24.4 23477.10 75.49 80.80 10185.22 15512.01 10060.28 10000.18 2.228 737044.38 5990657.38 n70 22 31.614 w148 4 22.2 23561.00 75.49 80.80 10198.21 15592.19 10081.30 10021.20 0.000 737124.13 5990672.74 n70 22 31.740 w148 4 19.9 B.P. EXPLORATION NIAKUK FIELD, WELL NO. NK-41~ NORTH SLOPE, ALASKA Gyro Continuous Multishot Survey Inside 5.5" DRILL PIPE Survey date' 28-OCTOBER, 1997 Job number :A1097GCE425 CONTENTS JOB NUMBER :A1097GCE425 1. DISCUSSION , SURVEY CERTIFICATION SHEET 2. SURVEY DETAILS 3. OUTRUN SURVEY LISTING 4. QUALITY CONTROL 5. EQUIPMENT AND CHRONOLOGICAL REPORT 1. DISCUSSION , SURVEY CERTIFICATION SHEET DISCUSSION JOB NUMBER: A1097GCE425 Tool 772 was run in WELL# NK-41 on SCHLUMBERGER 15/32" wireline inside DRILL PIPE. Had some problems running the survey. It took a long time to pump the tool to bottom. Also pressure requirements required us to run the 2.5" housing, which got temporarily stuck in the 3.5" drill pipe. The tool worked free after 4 hours. Good survey results were obtained. SURVEY CERTIFICATION SHEET JOB NUMBER: A1097GCE425 The data for this survey and the calculations for this survey were obtained and performed by me according to standards and procedures as set forth by Gyrodata Limited, true and correct to the best of my knowledge. TOM STODDARD OPERATIONS; ENGINEER The data and calculations for this survey have been checked by me and conform to the standards and procedures as set forth by Gyrodata Limited. This report represents a directional survey of this well based on the original data obtained at the wellsite. Checked by :- ROB SHOUP OPERATIONS MANAGER 2. SURVEY DETAILS SURVEY DETAILS JOB NUMBER: A1097GCE425 CLIENT: B.P. EXPLORATION RIG: SCHLUMBERGER LOCATION: NIAKUK FIELD, ALASKA WELL: NK-41 LATITUDE: 70.333 N LONGITUDE: 148.3 W SURVEY DATE: 28 -OCTOBER, 1997 SURVEY TYPE : GYRO CONTINUOUS MULTISHOT IN 5.5" DRILL PIPE DEPTH REFERENCE: 60.1' MAX. SURVEY DEPTH: ROTARY TABLE ELEVATION 17800' SURVEY TIED ONTO: NA SURVEY INTERVAL: 1700-17800' APl NUMBER: 050-029-22778 TARGET DIRECTION: 80.97 GRID CORRECTION: N/A CALCULATION METHOD: MINIMUM CURVATURE SURVEYOR: TOM STODDARD 3. OUTRUN SURVEY LISTING A Gyro da t a D i r e c t i ona i Survey for B.P. EXPLORATION NIAKUK FIELD, WELL NO. NK-41 NORTH SLOPE, ALASKA Job Number: NK41 Run Date: 28-Oct-97 18:30:00 Surveyor: TOM STODDARD Calculation Method: MINIMUM CURVATURE Survey Latitude: 70.334000 deg. N Sub-sea Correction from Vertical Reference: 60.1 ft. Azimuth Correction: Gyro: Bearings are Relative to True North Proposed Well Direction: 43.380 deg Vertical Section Calculated from Well Head Location Closure Calculated from Well Head Location Horizontal Coordinates Calculated from Local Horizontal Reference A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED DEPTH feet I N C L AZIMUTH VERTICAL DEPTH deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL C O O R D I N A T E S feet 0 100 200 300 400 .0 .0 .0 .0 .0 .00 0.00 0.0 .27 312.90 100.0 .08 60.42 200.0 .23 165.55 300.0 .25 285.22 400.0 0.0 0.00 0.0 0.0 -.0 .27 .2 312.9 .1 .30 .5 321.3 .0 ,.26 .3 318.4 -.2 .42 .3 279.9 0.00 N 0.00 E .16 N .17 W .36 N .28 W .20 N .17 W .06 N .33 W 5OO 599 699 799 903 .0 .0 .0 .0 .0 .19 313.96 500.0 .14 102.51 599.0 .28 246.75 699.0 .14 348.96 799.0 .16 90.67 903.0 -.3 .12 .7 289.2 .32 .7 295.6 .40 .8 284.3 .34 1.0 282.1 .22 1.0 290.9 .23 N .66 W .32 N .66 W .20 N .77 W .22 N 1.02 W .34 N .90 W 1000 1101 1200 1308 1399 .0 .0 .0 .0 .0 .22 242.90 1000.0 .26 339.33 1101.0 .23 7.88 1200.0 .25 4.38 1308.0 .28 27.01 1399.0 -.5 .38 1.0 285.4 .36 1.2 287.9 .13 1.5 302.6 .02 1.7 316.3 .12 2.0 326.8 .26 N .93 W .38 N 1.18 W .79 N 1.23 W 1.24 N 1.18 W 1.63 N 1.07 W 1500 1599 1700 1805 1904 .0 .0 .0 .0 .0 .29 28.71 1500.0 .27 348.18 1599.0 .32 357.94 1700.0 .77 40.76 1805.0 .82 48.86 1904.0 .9 1.3 1.7 2.6 4.8 .01 2.2 338.1 .20 2.6 343.2 .07 3.2 344.9 .54 3.9 354.5 .08 5.5 12.9 2.08 N .83 W 2.53 N .76 W 3.05 N .82 W 3.87 N .37 W 5.41 N 1.24 E 2006.0 2106.0 2206.0 2306.0 2406.0 3.58 43.78 2005.8 5.30 39.20 2105.5 6.41 39.83 2205.0 7.80 43.99 2304.2 8.35 45.17 2403.3 9.6 17.3 27.5 39.8 53.9 .74 9.9 28.0 .76 17.6 33.7 .11 27.7 35.8 .48 40.0 37.8 .57 54.0 39.5 8.77 N 4.66 E 14.60 N 9.74 E 22.47 N 16.23 E 31.63 N 24.52 E 41.63 N 34.38 E A Gyro da t a D i r e c t i on a i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 2506.0 11.05 46.67 2501.8 2606.0 13.47 46.16 2599.5 2706.0 15.30 47.25 2696.4 2756.0 16.59 48.38 2744.5 2800.0 17.51 48.62 2786.5 70.7 91.9 116.7 130.4 143.2 2.72 70.8 41.1 2.42 91.9 42.3 1.84 116.7 43.3 2.65 130.4 43.7 2.11 143.2 44.2 53.33 N 46.50 E 67.97 N 61.87 E 84.99 N 79.96 E 94.21 N 90.14 E 102.76 N 99.80 E 2850.0 17.93 49.17 2834.2 2900.0 18.69 49.71 2881.6 2950.0 19.13 51.56 2928.9 3000.0 20.35 52.36 2976.0 3050.0 22.14 51.84 3022.6 158 174 190 206 224 .4 .0 .1 .8 .7 .90 158.4 44.6 1.56 174.1 45.1 1.49 190.2 45.5 2.51 207.0 46.1 3.59 225.0 46.5 112.76 N 111.26 E 122.97 N 123.20 E 133.25 N 135.72 E 143.65 N 149.02 E 154.78 N 163.32 E 3100.0 24.16 49.92 3068.6 3150.0 25.60 48.74 3113.9 3200.0 27.01 47.19 3158.7 3250.0 27.96 46.01 3203.1 3300.0 29.01 45.49 3247.0 244 265 287 310 334 .2 .1 .2 .2 .0 4.32 244.6 46.9 3.05 265.6 47.1 3.13 287.8 47.1 2.19 310.9 47.1 2.16 334.7 47.0 167.19 N 180.91 N 195.75 N 211.60 N 228.24 N 178.56 E 194.51 E 210.96 E 227.72 E 244.80 E 3350.0 29.71 45.30 3290.6 3400.0 31.06 45.67 3333.8 3450.0 32.54 47.27 3376.2 3500.0 33.82 48.70 3418.1 3550.0 35.60 49.93 3459.2 358 383 410 437 465 .5 .8 .1 .4 .7 1.42 359.2 46.9 2.71 384.5 46.8 3.42 410.8 46.8 3.00 438.2 46.9 3.81 466.6 47.0 245.46 N 263.19 N 281.33 N 299.64 N 318.19 N 262.26 E 280.29 E 299.40 E 319.74 E 341.33 E 3600.0 37.19 51.11 3499.4 3650..0 38.38 51.42 3539.0 3700.0 39.92 51.28 3577.7 3750.0 41.04 50.68 3615.8 3800.0 42.52 50.12 3653.1 495 525 556 588 622 .1 .5 .7 .9 .0 3.47 496.2 47.2 2.42 526.8 47.5 3.08 558.3 47.7 2.37 590.7 47.9 3.06 624.0 48.0 337.05 N 356.21 N 375.93 N 396.37 N 417.60 N 364.23 E 388.12 E 412.77 E 437.99 E 463.65 E A Gyr oda t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 3850.0 43.76 49.62 3689.5 3900.0 45.01 49.19 3725.3 3950.0 46.10 48.99 3760.3 4000.0 47.24 48.21 3794.6 4050.0 48.99 47.22 3828.0 655.9 690.7 726.2 762.5 799.6 2.58 658.2 48.1 2.57 693.1 48.2 2.20 728.8 48.2 2.53 765.2 48.2 3.80 802.4 48.2 439.64 N 489.79 E 462.40 N 516.34 E 485.78 N 543.32 E 509.83 N 570.60 E 534.88 N 598.13 E 4100.0 50.38 46.43 3860.3 4150.0 52.03 46.18 3891.6 4200.0 53.64 46.07 3921.8 4250.0 55.44 46.06 3950.9 4300.0 57.17 46.09 3978.6 837.6 876.5 916.3 957.0 998.6 3.03 840.5 48.1 3.32 879.5 48.1 3.22 919.3 48.0 3.60 960.0 47.9 3.47 1001.6 47.8 560.97 N 625.94 E 587.89 N 654.11 E 615.50 N 682.83 E 643.75 N 712.16 E 672.61 N 742.12 E 4350.0 58.10 46.25 4005.4 4400.0 58.46 46.54 4031.7 4450.0 59.14 46.70 4057.6 4500.0 60.35 46.53 4082.7 4550.0 61.99 46.40 4106.9 1040.8 1083.2 1125.9 1169.1 1212.8 1.88 1043.8 47.7 .87 1086.3 47.7 1.40 1129.1 47.7 2.43 1172.3 47.6 3.29 1216.0 47.6 701.86 N 731.19 N 760.57 N 790.23 N 820.40 N 772.59 E 803.38 E 834.47 E 865.85 E 897.61 E 4600.0 63.17 45.98 4129.9 4650.0 64.45 45.44 4152.0 4700.0 65.85 45.07 4173.0 4750.0 66.99 44.66 4193.0 4800.0 68.43 44.39 4211.9 1257.1 1301.9 1347.3 1393.1 1439.4 2.48 1260.4 47.5 2.74 1305.3 47.5 2.89 1350.6 47.4 2.40 1396.4 47.3 2.92 1442.6 47.2 851.13 N 882.46 N 914.39 N 946.87 N 979.86 N 929.63 E 961.75 E 993.97 E 1026.30 E 1058.74 E 4850.0 69.45 44.08 4229.9 4900.0 70.54 43.41 4247.0 4950.0 71.13 43.20 4263.4 5000.0 70.52 43.29 4279.8 5100.0 71.21 43.60 4312.6 1486.0 1533.0 1580.2 1627.4 1721.9 2.12 1489.2 47.1 2.51 1536.1 47.0 1.25 1583.2 46.9 1.23 1630.4 46.8 .75 1724.7 46.6 1013.29 N 1047.23 N 1081.60 N 1116.00 N 1184.59 N 1091.29 E 1123.77 E 1156.17 E 1188.53 E 1253.49 E A Gyr oda t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 5150.0 71.52 43.77 4328.6 5200.0 70.95 43.79 4344.7 5250.0 70.61 43.71 4361.1 5300.0 71.03 43.73 4377.5 5350.0 71.31 43.72 4393.7 1769.3 1816.6 1863.9 1911.1 1958.4 .70 1772.0 46.5 1.15 1819.3 46.5 .69 1866.4 46.4 .84 1913.6 46.3 .56 1960.9 46.3 1218.86 N 1286.21 E 1253.04 N 1318.97 E 1287.15 N 1351.61 E 1321.28 N 1384.25 E 1355.48 N 1416.96 E 5400.0 71.76 44.04 4409.5 2005 5450.0 71.87 44.28 4425.1 2053 5500.0 71.30 44.17 4440.9 2100 5550.0 71.13 44.19 4457.0 2148 5600.0 70.91 44.05 4473.3 2195 .8 .3 .8 .1 .4 1.10 2008.3 46.2 .50 2055.8 46.2 1.17 2103.2 46.1 .34 2150.5 46.1 .52 2197.7 46.0 1389.66 N 1449.83 E 1423.74 N 1482.93 E 1457.74 N 1516.02 E 1491.69 N 1549.00 E 1525.63 N 1581.92 E 5650.0 70.62 43.72 4489.8 2242 5700.0 70.30 43.46 4506.5 2289 5750.0 70.32 43.09 4523.3 2336 5800.0 70.33 42.88 4540.2 2383 5850.0 70.46 42.44 4556.9 2430 .6 .7 .8 .8 .9 .84 2244.9 46.0 .80 2292.0 45.9 .70 2339.0 45.9 .41 2386.0 45.8 .87 2433.1 45.8 1559.66 N 1593.78 N 1628.06 N 1662.50 N 1697.14 N 1614.64 E 1647.13 E 1679.40 E 1711.50 E 1743.42 E 5900.0 71.72 41.57 4573.1 2478 5950.0 72.59 40.85 4588.5 2525 6000.0 72.89 40.94 4603.3 2573 6050.0 73.34 41.07 4617.8 2621 6100.0 73.07 41.01 4632.3 2669 .2 .8 .5 .3 .1 . 01 2480.3 45.7 20 2527.7 45.6 63 2575.3 45.5 93 2623.0 45.4 55 2670.7 45.4 1732.29 N 1768.09 N 1804.18 N 1840.29 N 1876.39 N 1775.07 E 1806.43 E 1837.69 E 1869.08 E 1900.51 E 6150.0 73.51 41.16 4646.7 2717 6200.0 73.69 41.30 4660.8 2764 6250.0 72.91 41.32 4675.1 2812 6300.0 72.80 41.33 4689.9 2860 6350.0 72.50 41.38 4704.8 2908 .0 .9 .8 .5 .2 93 2718.5 45.3 45 2766.3 45.2 57 2814.1 45.2 22 2861.8 45.1 61 2909.4 45.0 1912.49 N 1948.56 N 1984.54 N 2020.42 N 2056.24 N 1931.98 E 1963.59 E 1995.20 E 2026.75 E 2058.28 E A Gyr oda t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATE S feet 6400.0 72.12 41.45 4720.0 6450.0 72.02 41.36 4735.4 6500.0 71.70 41.24 4750.9 6550.0 72.07 41.32 4766.5 6600.0 72.28 41.50 4781.8 2955.8 3003.4 3050.8 3098.3 3145.9 .77 .26 .69 .76 .54 2957.0 45.0 3004.4 44.9 3051.9 44.9 3099.3 44.8 3146.8 44.8 2091.96 N 2089.79 E 2127.65 N 2121.26 E 2163.34 N 2152.62 E 2199.05 N 2183.97 E 2234.75 N 2215.46 E 6650.0 72.80 41.69 4796.8 6700.0 72.77 41.90 4811.6 6750.0 72.34 42.07 4826.6 6800.0 71.97 42.14 4841.9 6850.0 70.80 42.34 4857.9 3193 3241 3289 3336 3384 .6 .3 .0 .6 .0 10 3194.4 44.7 41 3242.1 44.7 91 3289.8 44.6 76 3337.3 44.6 37 3384.7 44.6 2270.42 N 2247.12 E 2306.03 N 2278.95 E 2341.48 N 2310.86 E 2376.79 N 2342.77 E 2411.87 N 2374.63 E 6900.0 69.97 42.45 4874.7 6950.0 69.50 42.39 4892.0 7000.0 69.13 42.43 4909.6 7050.0 67.87 42.38 4928.0 7100.0 68.25 42.29 4946.6 3431 3477 3524 3571 3617 .0 .9 .7 .2 .6 i . 67 3431.7 44.5 94 3478.6 44.5 75 3525.3 44.5 51 3571.8 44.4 78 3618.2 44.4 2446.65 N 2481.28 N 2515.82 N 2550.16 N 2584.45 N 2406.38 E 2438.02 E 2469.57 E 2500.94 E 2532.18 E 7150.0 69.39 42.36 4964.7 7200.0 70.20 42.30 4982.0 7250.0 69.86 42.15 4999.1 7300.0 70.82 42.11 5015.9 7350.0 71.14 42.06 5032.2 3664 3711 3758 3805 3852 .2 .1 .1 .2 .4 . 27 3664.8 44.4 63 3711.7 44.4 72 3758.6 44.3 91 3805.7 44.3 66 3852.9 44.3 2618.91 N 2653.60 N 2688.40 N 2723.32 N 2758.40 N 2563.57 E 2595.17 E 2626.75 E 2658.34 E 2690.02 E 7400.0 71.97 42.02 5048.0 7450.0 72.67 41.99 5063.2 7500.0 71.93 41.77 5078.4 7550.0 72.36 42.12 5093.7 7600.0 72.21 43.06 5108.9 3899 3947 3995 4042 4090 .9 .5 .1 .7 .3 . 1. 1. 1. 1. 65 4O 53 O7 82 3900.3 44.3 3947.9 44.2 3995.5 44.2 4043.1 44.2 4090.7 44.2 2793.63 N 2829.03 N 2864.49 N 2899.89 N 2934.96 N 2721.78 E 2753.66 E 2785.46 E 2817.27 E 2849.50 E A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED I DEPTH feet N C L AZIMUTH VERTICAL DEPTH deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 7650.0 72.09 43.66 5124.2 4137 7700.0 72.16 44.34 5139.6 4185 7750.0 71.64 44.71 5155.1 4233 7800.0 72.11 45.05 5170.7 4280 7850.0 71.74 45.11 5186.2 4328 .9 .5 .0 .5 .0 1.17 4138.3 44.1 1.31 4185.9 44.1 1.24 4233.4 44.1 1.15 4280.9 44.2 .75 4328.4 44.2 2969.56 N 3003.79 N 3037.67 N 3071.34 N 3104.91 N 2882.18 E 2915.24 E 2948.56 E 2982.09 E 3015.75 E 7900.0 71.54 45.29 5201.9 4375 7950.0 71.66 45.60 5217.7 4422 8000.0 71.74 45.79 5233.4 4470 8050.0 72.30 46.36 5248.9 4517 8100.0 72.00 46.86 5264.2 4565 .4 .9 .3 .8 .3 .52 4375.9 44.2 .63 4423.3 44.2 .39 4470.8 44.2 .56 4518.3 44.2 .13 4565.8 44.3 3138.35 N 3171.63 N 3204.79 N 3237.79 N 3270.48 N 3049.42 E 3083.23 E 3117.20 E 3151.45 E 3186.04 E 8150.0 72.45 47.00 5279.4 4612 8200.0 72.58 46.95 5294.5 4660 8250.0 72.22 46.63 5309.6 4708 8300.0 72.35 46.78 5324.8 4755 8350.0 72.43 47.38 5339.9 4803 .8 .4 .0 .6 .1 .94 4613.4 44.3 .27 4661.0 44.3 .93 4708.7 44.3 .38 4756.2 44.4 .16 4803.8 44.4 3302.99 N 3335.53 N 3368.16 N 3400.82 N 3433.28 N 3220.82 E 3255.69 E 3290.42 E 3325.09 E 3359.99 E 8400.0 72.43 47.45 5355.0 4850 8450.0 71.98 47.26 5370.3 4898 8500.0 71.77 47.34 5385.9 4945 8550.0 72.32 47.47 5401.3 4993 8600.0 72.23 47.67 5416.5 5040 .7 .2 .6 .0 .5 .13 4851.4 44.4 .97 4899.0 44.4 .45 4946.4 44.5 .13 4994.0 44.5 .42 5041.5 44.5 3465.53 N 3497.78 N 3530.01 N 3562.20 N 3594.33 N 3395.09 E 3430.11 E 3465.03 E 3500.04 E 3535.19 E 8650.0 72.86 48.19 5431.5 8700.0 72.58 48.37 5446.4 8750.0 72.41 48.45 5461.4 8800.0 72.54 48.48 5476.5 8850.0 72.40 48.32 5491.5 5088.1 5135.6 5183.1 5230.6 5278.1 .60 5089.1 44.6 .66 5136.8 44.6 .37 5184.3 44.6 .28 5231.9 44.7 .41 5279.5 44.7 3626.29 N 3658.06 N 3689.71 N 3721.33 N 3752.98 N 3570.60 E 3606.24 E 3641.90 E 3677.59 E 3713.25 E A Gyro da t a D i r e c t i on a i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg. / feet deg. 100 ft. HORIZONTAL COORDINATES feet 8900.0 72.45 48.15 5506.6 8950.0 72.08 48.13 5521.8 9000.0 72.47 48.26 5537.1 9050.0 72.63 48.41 5552.1 9100.0 72.24 48.35 5567.1 5325.6 5373.1 5420.5 5468.0 5515.5 .34 5327.1 44.7 .74 5374.6 44.8 .82 5422.2 44.8 .44 5469.8 44.8 .79 5517.3 44.8 3784.73 N 3816.50 N 3848.25 N 3879.96 N 3911.62 N 3748.80 E 3784.27 E 3819.77 E 3855.41 E 3891.05 E 9150.0 72.22 48.21 5582.4 9200.0 72.48 48.41 5597.6 9250.0 72.50 48.69 5612.6 9300.0 72.17 48.54 5627.8 9350.0 71.91 48.30 5643.2 5563.0 5610.4 5657.9 5705.4 5752.7 .27 5564.9 44.9 .65 5612.4 44.9 .53 5660.0 44.9 .71 5707.6 45.0 .68 5755.0 45.0 3943.31 N 3975.00 N 4006.56 N 4038.06 N 4069.63 N 3926.59 E 3962.17 E 3997.91 E 4033.65 E 4069.23 E 9400.0 72.03 48.16 5658.7 9450.0 72.24 48.13 5674.0 9500.0 72.33 48.19 5689.2 9550.0 72.77 48.40 5704.2 9600.0 72.38 48.25 5719.2 5800.1 5847.5 5895.0 5942.5 5990.1 .34 5802.5 45.0 .42 5850.0 45.0 .23 5897.6 45.1 .96 5945.2 45.1 .83 5992.8 45.1 4101.30 N 4133.05 N 4164.82 N 4196.56 N 4228.28 N 4104.69 E 4140.14 E 4175.62 E 4211.23 E 4246.86 E 9650.0 72.97 48.08 5734.1 9700.0 72.95 47.85 5748.7 9750.0 72.95 47.70 5763.4 9800.0 73.06 47.81 5778.0 9850.0 72.54 48.42 5792.8 6037.6 6085.3 6132.9 6180.6 6228.2 1.22 6040.5 45.1 .43 6088.3 45.2 .29 6136.0 45.2 .29 6183.8 45.2 1.56 6231.5 45.2 4260.12 N 4292.13 N 4324.25 N 4356.40 N 4388.29 N 4282.43 E 4317.93 E 4353.33 E 4388.73 E 4424.29 E 9900.0 72.77 48.66 5807.7 9950.0 72.40 48.76 5822.7 10000.0 72.31 48.74 5837.8 10050.0 72.16 48.72 5853.1 10100.0 71.94 49.21 5868.5 6275.8 6323.3 6370.7 6418.1 6465.4 .66 6279.1 45.3 .76 6326.8 45.3 .19 6374.3 45.3 .30 6421.8 45.3 1.02 6469.3 45.4 4419.89 N 4451.37 N 4482.78 N 4514.19 N 4545.42 N 4460.05 E 4495.90 E 4531.73 E 4567.51 E 4603.39 E A Gyro da t a D i re c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 10150.0 72.21 49.92 5883.9 10200.0 72.27 50.04 5899.1 10250.0 72.32 50.06 5914.3 10300.0 72.72 50.20 5929.4 10350.0 72.36 50.10 5944.4 6512 6560 6607 6654 6702 .7 .0 .3 .7 .1 .45 6516.8 45.4 .26 6564.2 45.4 .11 6611.7 45.5 .85 6659.2 45.5 .74 6706.8 45.5 4576.27 N 4639.60 E 4606.90 N 4676.06 E 4637.48 N 4712.58 E 4668.05 N 4749.18 E 4698.61 N 4785.80 E 10400.0 72.92 50.14 5959.3 10450.0 72.41 50.15 5974.2 10500.0 72.46 50.26 5989.3 10550.0 72.46 50.47 6004.3 10600.0 72.02 50.43 6019.6 6749 6796 6844 6891 6938 .5 .9 .2 .5 .8 .12 6754.3 45.6 .03 6801.9 45.6 .24 6849.4 45.6 .39 6897.0 45.7 .89 6944.4 45.7 4729.21 N 4759.80 N 4790.31 N 4820.72 N 4851.04 N 4822.42 E 4859.06 E 4895.69 E 4932.40 E 4969.12 E 10650.0 72.43 50.39 6034.8 10700.0 72.76 50.39 6049.8 10750.0 72.91 50.49 6064.6 10800.0 72.98 50.60 6079.2 10850.0 72.60 50.95 6094.0 6986 7033 7080 7128 7175 .0 .4 .8 .2 .6 .82 6991.9 45.7 .67 7039.4 45.8 .35 7087.0 45.8 .26 7134.7 45.8 .00 7182.2 45.8 4881.39 N 4911.80 N 4942.23 N 4972.60 N 5002.80 N 5005.81 E 5042.57 E 5079.40 E 5116.31 E 5153.31 E 10900.0 72.60 51.18 6109.0 10950.0 73.37 51.37 6123.6 11000.0 73.80 51.29 6137.7 11050.0 73.30 50.47 6151.9 11100.0 72.90 50.35 6166.4 7222 7270 7317 7365 7412 .9 .2 .7 .3 .7 .45 7229.8 45.9 .58 7277.4 45.9 .87 7325.1 46.0 .86 7372.9 46.0 · 83 7420.6 46.0 5032.79 N 5062.69 N 5092.66 N 5122.92 N 5153.41 N 5190.42 E 5227.72 E 5265.17 E 5302.37 E 5339.24 E 11150.0 73.77 50.76 6180.8 11200.0 74.29 51.34 6194.5 11250.0 74.40 51.61 6208.0 11300.0 73.80 51.62 6221.7 11350.0 73.64 51.88 6235.7 7460.3 7507.9 7555.6 7603.2 7650.6 .91 7468.3 46.0 .52 7516.2 46.1 .58 7564.2 46.1 .20 7612.0 46.1 .58 7659.8 46.2 5183.84 N 5214.06 N 5244.05 N 5273.90 N 5303.62 N 5376.23 E 5413.61 E 5451.27 E 5488.97 E 5526.66 E A Gyroda t a D i r e c t i on a i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page MEASURED DEPTH feet I N C L AZIMUTH VERTICAL DEPTH deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 11400.0 74.53 51.97 6249.4 11450.0 74.77 52.11 6262.7 11500.0 75.29 52.13 6275.6 11550.0 75.14 52.41 6288.4 11600.0 74.57 52.68 6301.4 7698.2 7745.9 7793.6 7841.4 7889.0 1.77 7707.6 46.2 .56 7755.6 46.3 1.03 7803.7 46.3 .62 7851.7 46.3 1.26 7899.7 46.4 5333.27 N 5564.51 E 5362.93 N 5602.53 E 5392.59 N 5640.65 E 5422.17 N 5678.89 E 5451.52 N 5717.20 E 11650.0 74.50 52.83 6314.8 7936 11700.0 74.28 52.81 6328.2 7984 11750.0 74.58 52.61 6341.6 8031 11800.0 73.94 52.10 6355.2 8079 11850.0 74.24 51.99 6368.9 8126 .6 .1 .6 .1 .7 .31 7947.6 46.4 .44 7995.5 46.4 .69 8043.3 46.5 .62 8091.2 46.5 .63 8139.1 46.5 5480.68 N 5755.57 E 5509.78 N 5793.94 E 5538.97 N 5832.25 E 5568.36 N 5870.36 E 5597.93 N 5908.27 E 11900.0 74.07 52.32 6382.6 8174 11950.0 73.90 52.37 6396.3 8221 12000.0 73.98 52.44 6410.2 8269 12050.0 73.79 52.79 6424.0 8316 12100.0 73.79 52.47 6438.0 8363 .2 .7 .1 .5 .9 .72 8186.9 46.6 .35 8234.8 46.6 .20 8282.6 46.6 .78 8330.3 46.7 .61 8378.1 46.7 5627.45 N 5946.25 E 5656.81 N 5984.30 E 5686.12 N 6022.38 E 5715.28 N 6060.54 E 5744.42 N 6098.70 E 12150.0 73.71 51.81 6452.0 8411 12200.0 73.57 51.27 6466.1 8458 12250.0 74.13 51.07 6480.0 8506 12300.0 73.86 50.25 6493.8 8554 12350.0 73.90 50.18 6507.7 8601 .4 .9 .4 .1 .8 .27 8425.9 46.7 .09 8473.7 46.8 .18 8521.6 46.8 .66 8569.5 46.8 .16 8617.5 46.8 5773.88 N 6136.60 E 5803.72 N 6174.17 E 5833.83 N 6211.58 E 5864.30 N 6248.75 E 5895.04 N 6285.66 E 12400.0 73.69 50.24 6521.6 12450.0 73.24 50.24 6535.9 12500.0 73.49 50.28 6550.2 12550.0 72.80 50.38 6564.7 12600.0 72.51 50.71 6579.6 8649.5 8697.1 8744.6 8792.1 8839.5 .44 8665.4 46.9 .90 8713.3 46.9 .51 8761.1 46.9 .38 8808.9 46.9 .87 8856.5 46.9 5925.76 N 6322.56 E 5956.42 N 6359.40 E 5987.04 N 6396.24 E 6017.59 N 6433.08 E 6047.92 N 6469.93 E A Gyro da t a D i r e c t i on a i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page 10 MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg. / feet deg. 100 ft. HORIZONTAL COORDINATES feet 12650.0 72.62 51.10 6594.6 12700.0 72.23 51.21 6609.7 12750.0 72.22 51.19 6624.9 12800.0 72.15 51.27 6640.2 12850.0 71.61 51.15 6655.8 8886.8 8934.0 8981.2 9028.3 9075.4 .77 8904.1 47.0 .80 8951.6 47.0 .04 8999.1 47.0 .21 9046.6 47.0 .09 9094.0 47.0 6078.00 N 6506.95 E 6107.89 N 6544.08 E 6137.73 N 6581.18 E 6167.54 N 6618.30 E 6197.31 N 6655.33 E 12900.0 71.87 51.07 6671.4 9122 12950.0 71.40 50.00 6687.2 9169 13000.0 71.63 49.38 6703.0 9216 13050.0 71.71 49.59 6718.8 9263 13100.0 71.50 49.13 6734.5 9311 .5 .5 .7 .9 .1 .53 9141.3 47.1 .25 9188.7 47.1 .26 9236.1 47.1 .43 9283.5 47.1 .96 9330.9 47.1 6227.12 N 6692.29 E 6257.28 N 6728.93 E 6287.96 N 6765.09 E 6318.80 N 6801.17 E 6349.70 N 6837.17 E 13150.0 71.70 49.09 6750.3 9358 13200.0 71.34 49.00 6766.2 9405 13250.0 71.29 49.04 6782.2 9452 13300.0 71.00 48.85 6798.3 9499 13350.0 71.69 48.63 6814.3 9546 .3 .4 .6 .7 .8 .41 9378.3 47.1 .74 9425.7 47.1 .13 9473.0 47.1 .67 9520.3 47.2 .44 9567.7 47.2 6380.76 N 6873.03 E 6411.84 N 6908.85 E 6442.90 N 6944.61 E 6473.98 N 6980.29 E 6505.22 N 7015.90 E 13400.0 71.91 48.50 6829.9 9594 13450.0 71.46 48.65 6845.7 9641 13500.0 71.71 48.74 6861.5 9688 13550.0 72.13 48.85 6877.0 9736 13600.0 72.23 48.78 6892.3 9783 .1 .4 .7 .0 .4 .51 9615.2 47.2 .94 9662.6 47.2 .53 9710.1 47.2 .86 9757.6 47.2 .25 9805.1 47.2 6536.65 N 7051.51 E 6568.06 N 7087.11 E 6599.37 N 7122.74 E 6630.68 N 7158.50 E 6662.03 N 7194.33 E 13650.0 72.14 48.86 6907.6 13700.0 72.28 48.86 6922.8 13750.0 72.99 49.05 6937.8 13800.0 72.60 49.01 6952.6 13850.0 72.45 48.98 6967.6 9830.8 9878.1 9925.6 9973.2 10020.6 .23 9852.7 47.2 .27 9900.3 47.2 .47 9948.0 47.2 .77 9995.8 47.2 .32 10043.4 47.2 6693.37 N 7230.16 E 6724.69 N 7266.01 E 6756.03 N 7302.00 E 6787.35 N 7338.06 E 6818.64 N 7374.05 E A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page 11 MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg. / feet deg. 100 ft. HORIZONTAL COORDINATES feet 13900.0 72.06 48.95 6982.8 10068.0 13950.0 71.73 48.96 6998.3 10115.3 14000.0 71.93 49.35 7013.9 10162.6 14050.0 72.27 49.76 7029.3 10209.9 14100.0 72.28 49.72 7044.5 10257.2 .77 10091.0 47.2 .67 10138.5 47.3 .83 10186.0 47.3 1.05 10233.6 47.3 .09 10281.1 47.3 6849.90 N 7409.98 E 6881.11 N 7445.82 E 6912.18 N 7481.76 E 6943.04 N 7517.96 E 6973.82 N 7554.31 E 14150.0 71.97 49.98 7059.9 10304.5 14200.0 72.31 50.31 7075.2 10351.8 14250.0 72.72 50.55 7090.2 10399.1 14300.0 72.21 50.54 7105.3 10446.4 14350.0 72.15 50.33 7120.6 10493.6 .80 10328.7 47.3 .93 10376.2 47.3 .94 10423.8 47.3 1.02 10471.4 47.3 .42 10519.0 47.4 7004.50 N 7035.00 N 7065.38 N 7095.68 N 7126.00 N 7590.68 E 7627.22 E 7663.98 E 7700.79 E 7737.49 E 14400.0 71.86 50.42 7136.1 10540.8 14450.0 72.03 50.43 7151.5 10588.0 14500.0 72.77 50.62 7166.7 10635.3 14550.0 72.25 50.74 7181.7 10682.6 14600.0 72.32 50.94 7196.9 10729.8 62 10566.4 47.4 35 10613.9 47.4 52 10661.5 47.4 07 10709.1 47.4 41 10756.7 47.4 7156.33 N 7186.61 N 7216.91 N 7247.13 N 7277.21 N 7774.11 E 7810.76 E 7847.54 E 7884.43 E 7921.36 E 14650.0 72.08 50.98 7212.2 10777.0 14700.0 71.81 50.96 7227.7 10824.2 14750.0 72.07 51.09 7243.2 10871.3 14800.0 71.57 51.38 7258.8 10918.3 14850.0 72.20 51.37 7274.3 10965.4 48 10804.2 47.4 55 10851.6 47.5 58 10899.1 47.5 13 10946.5 47.5 25 10993.9 47.5 7307.19 N 7337.13 N 7367.03 N 7396.77 N 7426.43 N 7958.34 E 7995.27 E 8032.22 E 8069.26 E 8106.39 E 14900.0 72.56 51.75 7289.5 11012.6 14950.0 72.10 51.87 7304.7 11059.7 15000.0 72.54 51.91 7319.8 11106.8 15050.0 72.50 51.81 7334.9 11154.0 15100.0 72.18 51.89 7350.0 11201.1 02 11041.4 47.5 95 11088.9 47.5 89 11136.4 47.6 20 11184.0 47.6 65 11231.5 47.6 7456.06 N 7485.52 N 7514.92 N 7544.37 N 7573.80 N 8143.71 E 8181.16 E 8218.64 E 8256.15 E 8293.62 E A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page 12 MEASURED DEPTH feet I N C L AZIMUTH VERTICAL DEPTH deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 15150.0 72.12 52.42 7365.4 15200.0 72.39 52.51 7380.6 15250.0 72.97 52.78 7395.5 15300.0 72.93 52.93 7410.1 15350.0 72.57 53.16 7425.0 11248.1 11295.1 11342.3 11389.4 11436.5 .01 11278.9 47.6 .55 11326.4 47.6 .28 11373.9 47.7 .29 11421.6 47.7 .85 11469.1 47.7 7603.00 N 8331.20 E 7632.01 N 8368.96 E 7660.97 N 8406.90 E 7689.84 N 8445.01 E 7718.55 N 8483.17 E 15400.0 72.96 53.28 7439.8 11483 15450.0 72.30 53.45 7454.7 11530 15500.0 71.96 53.52 7470.1 11577 15550.0 71.80 53.58 7485.6 11624 15600.0 71.82 53.36 7501.2 11670 .5 .5 .4 .2 .9 .81 11516.6 47.7 .36 11564.1 47.7 .69 11611.5 47.8 .33 11658.7 47.8 .41 11706.0 47.8 7747.14 N 8521.41 E 7775.61 N 8559.71 E 7803.93 N 8597.95 E 7832.17 N 8636.18 E 7860.44 N 8674.35 E 15650.0 72.39 53.11 7516.6 11717 15700.0 72.51 52.85 7531.7 11764 15750.0 72.53 52.76 7546.7 11811 15800.0 72.30 52.77 7561.8 11858 15850.0 72.20 52.70 7577.0 11905 .8 .8 .8 .9 .9 .23 11753.4 47.8 .55 11800.9 47.9 .17 11848.4 47.9 .46 11895.9 47.9 .25 11943.3 47.9 7888.92 N 8712.46 E 7917.63 N 8750.52 E 7946.46 N 8788.51 E 7975.30 N 8826.46 E 8004.13 N 8864.36 E 15900.0 72.59 51.86 7592.1 11952 15950.0 72.48 51.12 7607.1 12000 16000.0 72.50 51.22 7622.2 12047 16050.0 72.51 51.24 7637.2 12094 16100.0 72.36 51.19 7652.3 12141 .9 .2 .4 .6 .9 .79 11990.8 47.9 .42 12038.4 48.0 .19 12086.1 48.0 .04 12133.7 48.0 .31 12181.3 48.0 8033.29 N 8902.06 E 8062.98 N 8939.38 E 8092.88 N 8976.53 E 8122.74 N 9013.71 E 8152.60 N 9050.87 E 16150.0 72.52 50.97 7667.4 12189.1 16200.0 72.07 50.75 7682.6 12236.3 16250.0 72.15 50.69 7698.0 12283.5 16300.0 71.92 50.53 7713.4 12330.7 16350.0 72.20 50.47 7728.8 12377.9 .53 12228.9 48.0 .01 12276.4 48.0 .20 12324.0 48.0 .55 12371.5 48.0 .58 12419.0 48.0 8182.55 N 9087.96 E 8212.61 N 9124.90 E 8242.74 N 9161.73 E 8272.92 N 9198.49 E 8303.18 N 9235.19 E A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page 13 MEASURED I N C L AZIMUTH VERTICAL DEPTH DEPTH feet deg. deg. feet VERTICAL SECTION feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 16400.0 72.65 50.39 7743.9 16450.0 72.37 50.26 7758.9 16500.0 72.65 50.22 7773.9 16550.0 72.82 50.04 7788.8 16600.0 73.02 49.99 7803.5 12425.2 12472.6 12519.9 12567.3 12614.8 .91 12466.6 48.1 .61 12514.3 48.1 .57 12561.9 48.1 .48 12609.6 48.1 .41 12657.4 48.1 8333.54 N 8363.98 N 8394.49 N 8425.10 N 8455.81 N 9271.94 E 9308.64 E 9345.30 E 9381.95 E 9418.57 E 16650.0 73.02 49.91 7818.1 16700.0 72.74 49.81 7832.8 16750.0 72.84 49.67 7847.6 16800.0 72.58 49.59 7862.4 16850.0 72.25 49.77 7877.5 12662.3 12709.8 12757.2 12804.7 12852.1 .15 12705.2 48.1 .58 12753.0 48.1 .35 12800.7 48.1 .54 12848.4 48.1 .75 12896.1 48.1 8486.58 N 8517.39 N 8548.25 N 8579.18 N 8610.02 N 9455.17 E 9491.70 E 9528.15 E 9564.52 E 9600.86 E 16900.0 72.33 49.73 7892.7 16950.0 72.48 50.26 7907.9 17000.0 72.52 50.26 7922.9 17050.0 72.92 50.32 7937.7 17100.0 72.66 50.34 7952.5 12899.4 12946.8 12994.1 13041.5 13088.9 .18 12943.7 48.1 .05 12991.3 48.1 .08 13039.0 48.1 .81 13086.7 48.1 .52 13134.4 48.2 8640.79 N 8671.43 N 8701.91 N 8732.42 N 8762.91 N 9637.22 E 9673.73 E 9710.40 E 9747.12 E 9783.89 E 17150.0 72.72 50.26 7967.4 17200.0 72.35 50.14 7982.4 17250.0 72.38 50.16 7997.6 17300.0 72.40 50.01 8012.7 17350.0 72.16 50.04 8027.9 13136.3 13183.7 13231.0 13278.3 13325.6 .18 13182.1 48.2 .76 13229.8 48.2 .07 13277.4 48.2 .28 13325.0 48.2 .47 13372.6 48.2 8793.40 N 8823.93 N 8854.46 N 8885.04 N 8915.64 N 9820.61 E 9857.26 E 9893.84 E 9930.40 E 9966.89 E 17400.0 72.48 49.98 8043.1 17450.0 72.11 49.95 8058.3 17500.0 72.43 49.97 8073.5 17550.0 71.92 49.95 8088.8 17600.0 72.12 50.01 8104.3 13372.9 13420.3 13467.6 13514.8 13562.1 .64 13420.3 48.2 .75 13467.9 48.2 .64 13515.5 48.2 .02 13563.0 48.2 .42 13610.6 48.2 8946.26 N 8976.90 N 9007.53 N 9038.15 N 9068.74 N 10003.39 E 10039.86 E 10076.32 E 10112.76 E 10149.18 E A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: NK41 NK-41 Page 14 MEASURED I N C L AZIMUTH VERTICAL VERTICAL DEPTH DEPTH SECTION feet deg. deg. feet feet DOGLEG CLOSURE SEVERITY DIST. AZIMUTH deg./ feet deg. 100 ft. HORIZONTAL COORDINATES feet 17650.0 71.76 50.02 8119.8 13609.3 17700.0 71.71 51.06 8135.4 13656.4 17750.0 71.73 52.03 8151.1 13703.4 17800.0 71.34 53.27 8167.0 13750.2 17850.0 70.99 53.97 8183.1 13796.8 .71 13658.1 48.2 1 . 98 13705 . 5 48 . 2 1.84 13752.9 48.2 2.48 13800.2 48.3 1.49 13847.3 48.3 9099.28 N 10185.61 E 9129.46 N 10222.27 E 9158.98 N 10259.44 E 9187.75 N 10297.14 E 9215.82 N 10335.25 E 17862.0 70.97 53.95 8187.0 13807.9 .29 13858.6 48.3 9222.50 N 10344.42 E Final Station Closure: Distance: 13858.62 ft Az: 48.28 deg. A Gyroda t a D i r e c t i o n a i Survey for B.P. EXPLORATION NIAKUK FIELD, WELL NO. NK-41 NORTH SLOPE, ALASKA Job Number: SUB41 Run Date: 28-Oct-97 18:30:00 Surveyor: TOM STODDARD Calculation Method: MINIMUM CURVATURE Survey Latitude: 70.334000 deg. N Sub-sea Correction from Vertical Reference: 60.1 ft. Azimuth Correction: Gyro: Bearings are Relative to True North Proposed Well Direction: 43.380 deg Vertical Section Calculated from Well Head Location Closure Calculated from Well Head Location Horizontal Coordinates Calculated from Local Horizontal Reference A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: SUB41 NK-41 Page SUBSEA I N C L AZIMUTH VERTICAL VERTICAL DEPTH DEPTH SECTION feet deg. deg. feet feet DOGLEG SEVERITY deg./ 100 ft. CLOSURE DIST. AZIMUTH feet deg. H O R I Z O N T A L COORDINATES feet -60.1 0.00 100.0 .16 200.0 .17 300.0 .24 400.0 .21 0.00 161.16 123.60 237.47 302.49 0.0 160.1 260.1 360.1 460.1 0.0 .0 .0 - .1 -.2 0.00 .29 .28 .35 .24 0.0 0.0 .5 318.0 .3 319.5 .3 295.2 .7 285.5 .00 N 0.00 E .28 N .24 W .26 N .22 W .11 N .27 W .16 N .53 W 500.0 .16 600.0 .23 700.0 .19 800.0 .15 900.0 .20 185.59 190.64 309.20 197.21 180.29 560.1 660.1 760.1 860.1 960.1 -.2 .24 .37 .36 .27 .32 .7 293.1 .8 288.7 1.0 283.0 1.0 287.3 1.0 287.7 .28 N .66 W .24 N .73 W .21 N .92 W .29 N .95 W .29 N .91 W 1000.0 .24 1100.0 .24 1200.0 .24 1300.0 .27 1400.0 .29 1500.0 .28 1600.0 .30 1700.0 .58 1800.0 1.35 1900.0 2.79 300.28 356.37 5.93 17.34 28.04 4.10 354.09 22.45 45.27 46.06 1060.1 1160.1 1260.1 1360.1 1460.1 1560.1 1660.1 1760.1 1860.1 1960.1 -.5 1.2 1.5 2.2 3.8 7.4 .37 .22 .07 .08 .05 .12 .12 .34 .84 1.44 1.2 286.9 1.5 296.7 1.7 310.2 2.0 322.3 2.2 333.7 2.6 341.2 3.2 344.3 3.9 350.4 5.5 4.8 9.9 21.2 .33 N 1.08 W .62 N 1.21 W 1.04 N 1.21 W 1.47 N 1.12 W 1.90 N .93 W 2.35 N .79 W 2.84 N .80 W 3.52 N .56 W 4.73 N .86 E 7.26 N 3.13 E 2000.0 4.51 41.29 2060.1 2100.0 5.91 39.55 2160.1 2200.0 7.18 42.14 2260.1 2300.0 8.11 44.65 2360.1 2400.0 9.90 46.03 2460.1 13.8 22.9 34.3 47.8 63.6 1.75 1.40 1.32 .97 1.81 17.6 31.1 27.7 34.9 40.0 36.9 54.0 38.8 70.8 40.4 11.94 N 7.42 E 18.91 N 13.30 E 27.56 N 20.83 E 37.27 N 30.08 E 48.38 N 41.37 E A Gyro da t a D i r e c t i o na i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: SUB41 NK-41 Page SUBSEA I N C L AZIMUTH VERTICAL VERTICAL DEPTH DEPTH SECTION feet deg. deg. feet feet DOGLEG SEVERITY deg./ 100 ft. CLOSURE DIST. AZIMUTH feet deg. H O R I Z O N T A L COORDINATES feet 2500.0 12.49 46.37 2560.1 2600.0 14.61 46.84 2660.1 2700.0 16.93 48.47 2760.1 2800.0 18.34 49.46 2860.1 2900.0 19.94 52.09 2960.1 83.3 107.4 135.2 166.9 201.1 . 2. 2. 1. 2. 54 06 45 26 16 91.9 41.8 116.7 42.9 143.2 43.9 174.1 44.9 207.0 45.9 62.06 N 55.67 E 78.62 N 73.18 E 97.39 N 93.73 E 118.34 N 117.78 E 140.14 N 144.53 E 3000.0 23.79 50.28 3060.1 3100.0 27.04 47.15 3160.1 3200.0 29.22 45.44 3260.1 3300.0 31.98 46.66 3360.1 3400.0 35.63 49.95 3460.1 240 287 341 400 466 .6 .9 .4 .1 .4 . 3. 1. 3. 3. 19 10 94 15 81 244.6 46.8 310.9 47.1 359.2 47.0 410.8 46.8 496.2 47.0 164.91 N 175.75 E 196.23 N 211.47 E 233.40 N 250.03 E 274.43 N 292.14 E 318.62 N 341.84 E 3500.0 39.22 51.34 3560.1 3600.0 42.76 50.02 3660.1 3700.0 46.10 48.99 3760.1 3800.0 50.37 46.44 3860.1 3900.0 56.01 46.07 3960.1 542 628 726 837 970 .5 .5 .1 .4 .9 . 2. 2. 3. 3. 78 97 20 03 56 558.3 47.6 658.2 48.0 728.8 48.2 840.5 48.1 1001.6 47.9 366.96 N 421.86 N 485.66 N 560.79 N 653.37 N 401.56 E 468.70 E 543.19 E 625.75 E 722.14 E 4000.0 59.27 46.68 4060.1 4100.0 64.99 45.30 4160.1 4200.0 71.01 43.24 4260.1 4300.0 70.63 43.71 4360.1 4400.0 71.09 44.16 4460.1 1130.3 1319.5 1570.7 1860.9 2157.0 1.50 2.80 1.50 .72 .37 1172.3 47.6 1350.6 47.4 1583.2 46.9 1866.4 46.4 2197.7 46.1 763.57 N 894.84 N 1074.69 N 1285.03 N 1498.12 N 837.64 E 974.24 E 1149.65 E 1349.59 E 1555.24 E 4500.0 70.71 42.27 4560.1 2440.2 4600.0 73.68 41.29 4660.1 2762.6 4700.0 71.92 41.29 4760.1 3078.8 4800.0 70.69 42.36 4860.1 3390.2 4900.0 69.10 42.34 4960.1 3652.3 1.29 .47 .73 2.28 1.89 2480.3 45.8 2766.3 45.2 3099.3 44.8 3431.7 44.6 3664.8 44.4 1704.01 N 1946.86 N 2184.37 N 2416.48 N 2610.12 N 1749.61 E 1962.09 E 2171.08 E 2378.84 E 2555.56 E A Gyro d a t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: SUB41 NK-41 Page SUBSEA I N C L AZIMUTH VERTICAL VERTICAL DOGLEG DEPTH DEPTH SECTION SEVERITY feet deg. deg. feet feet deg./ 100 ft. CLOSURE DIST. AZIMUTH feet deg. HORIZONTAL COORDINATES feet 5000.0 72.53 41.99 5060.1 3937.9 5100.0 71.79 44.82 5160.1 4248.2 5200.0 72.08 46.73 5260.1 4552.7 5300.0 72.28 47.39 5360.1 4866.5 5400.0 72.42 48.44 5460.1 5179.0 1.45 1.21 1.25 .41 .40 3947.9 44.2 4280.9 44.1 4565.8 44.2 4899.0 44.4 5184.3 44.6 2821.87 N 2747.21 E 3048.44 N 2959.29 E 3261.78 N 3176.83 E 3476.26 N 3406.73 E 3686.99 N 3638.84 E 5500.0 72.43 48.38 5560.1 5600.0 72.05 48.16 5660.1 5700.0 72.95 47.74 5760.1 5800.0 72.06 48.94 5860.1 5900.0 72.90 50.14 5960.1 5493 5804 6122 6439 6752 .3 .6 .3 .7 .1 .63 .35 .32 .63 1.12 5517.3 44.8 5850.0 45.0 6136.0 45.2 6469.3 45.3 6801.9 45.6 3896.84 N 3874.41 E 4104.26 N 4108.00 E 4317.05 N 4345.39 E 4528.43 N 4583.88 E 4730.92 N 4824.47 E 6000.0 72.86 6100.0 73.07 6200.0 74.72 6300.0 74.04 6400.0 73.63 6500.0 73.02 6600.0 71.69 6700.0 71.48 6800.0 71.69 6900.0 72.53 50 50 52 52 51 5O 51 49 48 48 .46 .40 .08 .06 .50 .35 .13 .03 .73 .99 6060.1 6160.1 6260.1 6360.1 6460.1 6560.1 6660.1 6760.1 6860.1 6960.1 7066.5 7392.1 7736.6 8096.2 8438.7 8777.2 9088.4 9387.4 9684.6 9997.0 .44 1.28 .79 1.27 1.17 7087.0 45.8 7420.6 46.0 7755.6 46.2 8139.1 46.5 8473.7 46.8 1.11 8808.9 46.9 .93 9141.3 47.0 .61 9425.7 47.1 .57 9710.1 47.2 .54 10043.4 47.2 4933.03 N 5068.27 E 5140.13 N 5323.18 E 5357.16 N 5595.13 E 5578.95 N 5883.94 E 5791.04 N 6158.21 E 6007.96 N 6421.47 E 6205.56 N 6665.57 E 6399.94 N 6895.14 E 6596.69 N 7119.69 E 6803.08 N 7356.15 E 7000.0 71.97 7100.0 72.45 7200.0 71.62 7300.0 72.14 7400.0 72.18 49.98 50.53 51.38 52.24 53.47 7060.1 7160.1 7260.1 7360.1 7460.1 10305 10614 10922 11232 11547 .2 .8 .3 .0 .0 .80 1.01 1.14 .89 1.12 10376.2 47.3 10661.5 47.4 10993.9 47.5 11278.9 47.6 11611.5 47.8 7004.94 N 7591.21 E 7203.75 N 7831.56 E 7399.25 N 8072.37 E 7592.99 N 8318.31 E 7785.56 N 8573.14 E A Gyro da t a D i r e c t i ona i Survey B.P. EXPLORATION NIAKUK FIELD, WELL NO. NORTH SLOPE, ALASKA Job Number: SUB41 NK-41 Page SUBSEA I N C L AZIMUTH DEPTH feet deg. deg. VERTICAL VERTICAL DOGLEG DEPTH SECTION SEVERITY feet feet deg./ 100 ft. CLOSURE DIST. AZIMUTH feet deg. HORIZONTAL COORDINATES feet 7500.0 72 7600.0 72 7700.0 72 7800.0 72 7900.0 72 .33 .44 .40 .62 .69 52.77 51.08 50.25 49.60 50.30 7560.1 11853.7 .43 7660.1 12166.3 .42 7760.1 12476.3 .61 7860.1 12797.3 .51 7960.1 13113.0 .35 11895.9 47.9 12228.9 48.0 12561.9 48.1 12848.4 48.1 13182.1 48.2 7972.10 N 8168.06 N 8366.40 N 8574.32 N 8778.42 N 8822.25 E 9070.01 E 9311.55 E 9558.81 E 9802.57 E 8000.0 72 8100.0 71 8126.9 70 8200.0 70 .14 .51 .97 .41 49.95 52.73 53.95 53.62 8060.1 13425.9 .74 8160.1 13729.9 2.20 8187.0 13807.9 .29 8260.1 14016.4 0.00 13515.5 48.2 13800.2 48.3 13858.6 48.3 13858.6 48.4 8980.52 N 9175.29 N 9222.50 N 9347.24 N 10044.17 E 10280.81 E 10344.42 E 10515.87 E Final Station Closure: Distance: 13858.62 ft Az: 48.37 deg. 4. QUALITY CONTROL QUALITY CONTROL REPORT JOB NUMBER: A1097GOE425 TOOL NUMBER: 772 MAXIMUM GYRO TEMPERATURE: 77.33 C MAXIMUM AMBIENT TEMPERATURE: 64.12 C MAXIMUM INCLINATION: 75.29 AVERAGE AZIMUTH: 48.28 WIRELINE REZERO VALUE: +55 REZERO ERROR / K: N/A CALIBRATION USED FOR FIELD SURVEY: 2040 CALIBRATION USED FOR FINAL SURVEY: 2040 PRE JOB MASS BALANCE OFFSET CHECK: -.30 POST JOB MASS BALANCE OFFSET CHECK~: USED O.O/N/A CONTINUOUS CONDITION OF SHOOK WATCHES -.45 UPON ARRIVAL AT RIG: I OFF UPON COMPLETION OF SURVEY: 1 OFF UPON RETURN TO SCHLUMBERGER 1 OFF BOTTOM LINE COMPARISIONS M.D. INC AZIMUTH TVD NORTHING EASTING MWD 17855 70.74 53.90 8170.8 9177 10378 FINAL SURVEY 17862 70.97 53.95 8187.0 9222 10344 FUNCTION TEST JOB NUMBER: A1097GCE425 5 Survey stations were collected at the measured depth shown below. The tables show the repeatability of the gyro tool in both inclination and azimuth at one measured depth. INCLINATION M.D. ff 1 2 3 4 5 2756 16,59 16,59 16.59 16.59 16.59 AZIMUTH M.D. ft 1 2 3 4 5 2756 48.28 48.29 48.41 48.37 48.38 5. EQUIPMENT AND CHRONOLOGICAL REPORT EQUIPMENT REPORT JOB NUMBER: A1097GCE425 DOWNHOLE ELECTRONICS SURFACE ELECTRONICS PRIMARY TOOL No. 772 GYRO SECTION DATA SECTION POWER SECTION COMPUTER A0162 POWER SUPPLY C0111 PRINTER C0112 INTERFACE A0349 A0085 A0079 A0143 BACKUP TOOL No. 777 GYRO SECTION DATA SECTION POWER SECTION COMPUTER A0169 POWER SUPPLY C0089 PRINTER C0086 INTERFACE A0222 A0107 A0029 A0055 WIRELINE COMPANY: SCHLUMBERGER CABLE SIZE: 15/32" RUNNING GEAR 2.5" HOUSING W/2.25 CENTRALIZERS TOP AND BOTTOM TOTAL LENGTH OF TOOL :32' MAXIMUM O.D.: 2.5 INCHES TOTAL WEIGHT OF TOOL: 250 POUNDS CHRONOLOGICAL REPORT JOB NUMBER: A1097GC.,E425 TUESDAY, 10/28/97 02:00 09:00 10:00 10:30 15:00 15:30 17:00 18:30 20:30 23:15 FINISH SURVEY MPI-06 ALERTED BY POOL 7 TO LOCATION ARRIVE POOL 7, MU TOOL RIG UP SCHLUMBERGER PICK UP 2.25" TOOL RIH TO 1000'. 4200# TO BREAK CIRC. HOUSING NOT ADEQUATE. POOH. RIH W/2.5" SYSTEM. REPLACE PACKING ~6899' REPLACE PACKING ~12800' WEDNESDAY, 10/29/97 01:30 02:45 03:30 06:00 09:30 10:00 16:00 REPACE PACKING ~15500 PUMP INTO 3.5" DRILL PIPE ~17150' STUCK IN 3.5" DRILL PIPE.~17800' WORK TOOL FREE. OUTRUN CONTINUOUS LD TOOL. BD TOOL. CHECK TOOL, PROCESS RESULTS. THURSDAY, 10/30/97 08:30 PRINT OUT RESULTS, TAKE TO RIG 10:00 TO MILNE POINT W/MPI-06 RESULTS 12:00 RECHECK TOOLS. 19:45 TO ANCHORAGE. 04:50PH BP EXPLORATZOHSTATE OF ALASKA ALASF_..~..)IL AND GAS CONSERVATION CO[~_,,SSION APPLICATION FOR SUNDRY APPROVAL P.1/4 1. Type of Request: [] Abandon [] Alter Casing , [] Suspend [] Plugging ['-ITime Extension O Repair Well [] Pull Tubing [] Varien~ Change Approved Program [] Ope~'atlon Shutdown [] Re-Enter Suspended Well [] Stimulate Name of Operator BP Exploration (Alaska) Inc. Address P.O. Box 196612, Anchorage, Alaska 99519-6612 4. Location of well at surface 1474' NSL, 717' WEL, SEC. 36, T12N, R15E, UM At top of productive interval N/A At effective depth 4854' NSL, 3772' EWL, SEC. 29, T12N, R16E, UM At total depth 1071' NSL, 4354' EWL_,_S_.E_C_._2__I_,._T.! 2N, R16E, UM 12. Present well condition summary [] Perforate [] Other i5. Type of well: [] Development [] Exploratory r"-I Stratigraphic []Service 6. Datum Elevation (DF or KB) KBE = 60" 7. Unit or Property Name Niakuk 8. Well Number NK-41A 9. Permit Number 97-158 10. APl Number 50-029-22778-01 11. Field and Pool Niakuk Oil Pool Total depth; measured 23561 true vertical 10066 Effective depth: measured 17015 true vertical 7912 feet Plugs (measured) feet feet Junk (measured) feet Abandonment plugs at 17015'-18453' & 18453'-19943', Cement ~31u¢~ at 23561 '-22900' Drillplpe :~0148'-22502' Casing Length Structural Conductor Surface 7000' Intermediate 17620' Production Liner Size Cemented MD TVD 20" 260 sx Arcticset (Approx.) 80' 80' 13-3/8" 3360 ex Pi: 'E', 119o s× 'G', 50 ~;x PF 'C' 7041 ' 4864' 9-5/8" 740 SX Class 'G' 17661' 8109' Perforation depth: measured N/A true vertical Tubing (size, grade, and measured depth) 4-1/2" 12.6# L-80 to 30' Packers and 888V (type and measured depth) N/A ORIGINAL 13. Attachments (~ Description summary of proposal i"'] Detailed operations program ~ BOP sketch 14. Estimated date for commencing operation November 2, 1997 16. If proposal was verbally approved Blair Wondzell 10/28/97 Name of approver Date approved confacf Engineer Name/Number: Larry Wo/f$on, 6~4.5510 17. I hereby certify that the fo~ is (r~and Trrect to the best of my knowledge Signed ~ - Title Senior Drilling Eng.ineer¢ ~ L2 .......... "~'~l:;ommission Use Only 15. Status of well classifications as: ~ Oil E] Gas r-~ Suspended service P~are~ ~y Name/Number;. Kalf3y Carnpoarnor, 5~4-~ I £2 Conditions of Approval: Notify Commission so representative may witness I Approval No.;~x:j'~ Plug integrity ~-' BOPTest ~ Location clearance~ '- Mechanical Integrity Test Subsequent form required 10--~-O-~- A~3proved b¥ order of the Oommlssfon original SigRsd By commissioner Form 10-403 Rev. 06/15/88 0avid W, Johnston Subm~ In ~rriplicate Approved Copy TREE: 4"- 5M OIW Non-chron.~ WELLHEAD: 13-5/8" - 5M Universal Actuator: Baker 1 jt-4-1/2" 12.$# L-80, IBTC-.Mod w/BPV installed set ~n.tubingBTC hanger7041, ]/j 13-3/8", 68 ~/~t, LB0, NK-41A IKOP:1800' [ Max Angle: 75° @ 11554' ME) I Note: P~anned depth~ are [~'i~a~/cs. I 8.5 ppg Seawater 9-5/8", 47#/FT, 1.80, BTC-M I Top of Fish Boffom of Fish 17661' I 20r148' I [ 22~502' I Date 10/28/97 LW 10/29/97 LW Comments Pn3posed Suspension Proposed Suspension; added 1 jt tubing RT-G[. -- 40.7' GL-SL = 19.3' RT-BF -- 39.7' Freeze Protection Planned Top of Cement Plug #3 Setting Depth Planned Top of Cement Plug #2 Setting Depth I ~e,4.eo' I I 11.5 ppg OBM Estimated Top of Cement Total Depth I 22,900' I Niakuk WELL: NK-41A AP! NO: ~' 50-029-22778-01 Shared Services Drilling Iii I I ._ NK-41A Well Plan Addendum: Well Suspension Rev I Note: Additions and modifications are in italics; see Steps 9-14, 1. Pick up 65 joints of 3 W' drill pipe and R/H; circulate and heat mud while running in, RIH to *19,950'; circulate and ensure mud is warm and hole clean, 2. Run Oyrodata gyro in the continuous mode through drillpipe as deep as pos,,dble. -- Have Gyrodata e-mail file to Operations Drilling Engineer as soon as available, 3, Set 1500 ft abandonment plug from *~19,950'to 18,450' as follows: m 27 bbls water w/2 galfobl surfactant -- 140 bbls 17,0 ppg cement, mixed on the fly (volume based on 9 '/t" hole) -- 3 bbls water w/2 galfobl surfactant -- displace at a high rate with OBM; rotate during job 4. Pick up to * 18,450' and circulate bottoms up, while rotating pipe to ensure that cement is being washed out of drill pipe. -- WOC 4 hours before setting second plug. 5. Set 1500 ft abandonment plug from_*18,450' to ±16,950' as follows: -- 27 bbls water w/2 gal/bbl surfactant -- 140 bbls 17.0 ppg cement, mixed on the fly (volume based on 9 W' hole) -- 3 bbls water w/2 galfobl surfactant -- displace at a high rate with OBM; rotat~ during job 6. Pull out of hole to ±16,950' and circulate at a ltigh rate to ensure the drill pipe is free of cement. Circulate at least one bottoms up and drop Halliburton drill pipe wiper plug modified to pass through 5 W' & 3 W' drill pipe, 7. POH and lay down 3 W' and 5 W' drill pipe not needed for next step. Have Tuboscope inspect th~ all the 5 W' drill pipe as follows: -- Clean and visual ~ Mag particle on tool joint -- Box swell/pin stretch 8. Make-up 8 W' bit and scraper for 9 5/8" casing. Rill and clean out cement stringers and drill out to top of firm cement. Pressure test casing to 1500 psi. -- Circulate and heat mud while RII-I, 9. Displace the OBM using the following displacement procedure--see Oil B~ed Mud Displacement Procedure dated 10/13/97: Note: Since the well will be redrilled, brine clarity is not an issue. The procedure has been modified With the addition of 40 bbls of spacer and omitting the CE 101. 100 bbls 12.5 ppg Alpha Spacer (ARCO 8L Spacer) 60 bbls 9.1 ppg Xanvis (2.25 ppb) Gel pill 8.5 ppg Seawater with 25 gal/JO0 bbl Cor~xit 7726 Circulate at 11 bpm or greater; rotate and reciprocate during job. Rev 1 10/29/97 ~×~'~ OHI~I~ S33I^~3S ~3~HS HdO~:PO ~6, P~ hOH NK-41A Well Plan Addendum: Well Suspension Rev 1 10/29/97 10. POH to ±2200' laying down the 5 W' drill pipe. Freeze protect well and lay down remainder of drill pipe and inspect as above. I 1. Retest 9 5/8" wellhead pack, off and replace as needed. Pull bowl protector, 12. Secure the well by running one joint of 4 V~", L-80, IBTC Mod tubing below the tubing hanger. Land tubing and test packoff to 5000 psi; RILDS. 1_3. Set the "two way" check, Nipple down the BOP's. Nipple up the tubing head adapter and tree, Test the tubing head adapter and tree to 5000 psi. Pull the "two way" check with a lubricator. 14. Set a BPV in the tubing hanger using a lubricator. Install ali needed flanges and needle valves. Label all of the control/injection ports, including those that are blanked off. Close ail valves. Release the rig and move off location, !5. After rig has moved off the well contact the WSA and run Schlumberger USIT log from surface to the top of the cement, Send color copy of log to Niakuk Production Engineer and Operations Drilling Engineer for evaluation of casing wear, Attachments: NK-41A Well Schematic Oil Based Mud Displacement Procedure dated 10/13/97--faxed as separate attaehtnent Prepared by: Larry Wolfson Approved by: Steve Shultz (original signed 10/29/97) To: David :~nston Thru: Blair Won ze~'~ll From: John Ht~. ~ OPERATION: Drlg: X Drlg Contractor: Operator: Well Name: Casing Size: 9 5/8" Test: I nitia X Workover: Pool BPX / SSD AOGCC BOPE Test Report NK-41 Set @ Weekly Rig No. 17,66'l'rnd Other ~ PTD # 97-158 Rig Rep.: Co. Rep.: Location: Sec. 36 T. DATE: 10/18/97 Rig Ph.# 659-4815 Jim Davidson Les Peak 12N R. t5E Meridian Umiat MISC. INSPECTIONS: Location Gen.: ok Well Sign yes Housekeeping: ok (Gen) Drl. Rig ok PTD On Location yes Hazard Sec. yes ,, Standing Order Posted yes , FLOOR SAFETY VALVES: Upper Kelly / IBOP Lower Kelly / IBOP Ball Type Inside BOP Test Quan. Pressure P/F 1 500/5,000 P 500/5,000 P 500/5,000 P 500/5,000 P BOP STACK: Annular Preventer Pipe Rams Lower Pipe Rams Blind Rams Choke Ln. Valves HCR Valves Kill Line Valves Check Valve Quan. Test Press. P/F P 300/3,000 500/5,000 500/5,000 500/5,000 500/5,000 5OO/5, OOO 500/5,000 P P p* p* 2 P P CHOKE MANIFOLD: No. Valves 16 No. Flanges Manual Chokes Hydraulic Chokes I Test Pressure P/F 500/5,000 P 38 500/5,000 P 2 P Functioned Functioned P ACCUMULATOR SYSTEM: System Pressure 3,250 I P Pressure After Closure 1,600 I P MUD SYSTEM: Visual Alarm 200 psi Attained After Closure minutes 37 sec. Trip Tank ok ok System Pressure Attained 2" minutes 45 sec. Pit Level Indicators ok ok Blind Switch Covers: Master: yes Remote: yes Flow Indicator ok ok Nitgn. Btl's: 6 @ 2050 avg. Meth Gas Detector ok ok . Psig. H2S Gas Detector ok ok ' Number of Failures: 0 ,Test Time: 4.0 Hours. Number of valves tested 31 Repair or Replacement of Failed Equipment will be made within 0 days. otify the Inspector and follow with Written or Faxed verification to the AOGCC Commission Office at: Fax No. 276-7542 Inspector North Slope Pager No. 659-3607 or 3687 If your call is not returned by the inspector within 12 hours please contact the P. I. Supervisor at 279-1433 REMARKS: Very good tesfl!! Distribution: orig-Well File c - Oper./Rig c- Database c - Trip Rpt File c - Inspector F1-021 L (Rev. 12/94) STATE WITNESS REQUIRED? YES X NO 24 HOUR NOTICE GIVEN YES X NO Waived By: Witnessed By: Az1 Ijref. xls , ohn/4. Spaulding BP EXPLORATION BP Exploration (Alaska) Inc. 900 East Benson Bouievarcl P.O. Box 196612 Anchorage, Alaska 99519-6612 (907) 561-5111 April 14th, 1998 Alaska Oil and Gas Conservation Commission 3001 Porcupine Drive Anchorage, Alaska 99501 Dear AOGCC Representative, Per the terms of the Tract 75 agreement enclosed are the following bluelines, sepias and tapes for Niakuk #41A and 41. Log Date NK-41A Gyro survey NK-41A GR Collar Log , NK-41 CDR Final ' NK-41 ADN Final, NK-41 PB#1 CDR Final NK-41 PB#1 ADN Final, 10/28/97 2/1/98 6/30/97-9/10/97 6/30/97-9/10/97 6/30/97-7/29/97 6/30/97-7/29/97 Please contact me at 564-5126 if you have any questions. Sincerely, I~avid Boyer: Sr. OeotC/gist Greater Point Mclntyre Area MS Enclosures Please sign below and return to Marian Sloan, BPX, Mail Stop MB9-4 for reciept of transj:mttal. i BP EXPLORATION BP Exploration (Alaska) Inc. 900 East Benson Boulevard P.O. Box 196612 Anchorage, Alaska 99519-6612 (907) 561-5111 April 14th, 1998 Alaska Oil and Gas Conservation Commission 3001 Porcupine Drive Anchorage, Alaska 99501 Dear AOGCC Representative, Per the terms~_oJ the Tract 75 agreement enclosed are the following bluelines, ~~__~~or Niakuk #4lA. Date NK-41A TVD ADN ~ NK-41A TVD CDR , 9/13/97-9/28/97 <.,~ ~~ 9/28/97-10/8/97 ~ (~.~/,~S ..... Please contact me at 564-5126 if you have any questions. Sincerely, David Sr. Ge~ Greater Point Mclntyre Area MS Enclosures Please sign below and return to Marian Sloan, BPX, Mail Stop MB9-4 for iept of transmittal./-.. BP EXPLORATION BP Exploration (Alaska) Inc. 900 East Benson Boulevard P.O. Box 196612 Anchorage, Alaska 99519-6612 (907) 561-5111 March 31st, 1998 Alaska Oil and Gas Conservation Commission 3001 Porcupine Drive Anchorage, Alaska 99501 Dear AOGCC Representative, Per the terms of the Tract 75 agreement enclosed are the following bluelines and sepias for Niakuk #41A. Log Date ADN Final 9/28/97-10/8/97 CDR Final 9/28/97-10/8/97 Please contact me at 564-5126 if you have any questions. Sincerely,. ,, Dagid Boyer, Sr. Geologist Greater Point Mclntyre Area MS Enclosures Please sign below and return to Marian Sloan, BPX, Mail Stop MB9-4 for reciept of transmittal. BP EXPLORATION BP Exploration (Alaska) Inc. 900 East Benson Boulevard Re. Box 196612 Anchorage, Alaska 99519-6612 (907) 561-5111 November 18, 1997 Alaska Oil and Gas Conservation Commission 3001 Porcupine Drive Anchorage, Alaska 99501 Dear AOGCC Representative: Per the terms of the Tract 75 agreement enclosed are the following cuttings samples for Niakuk #41 A: Drilled Cuttings Samples Depth Dry Cuttings: NK-41A (4 boxes) 1.988e - 21300' 21300 - 22310 22310 - 23310 23310 - 23561 (T.D.) Please contact me at 564-4531 if you have any questions. Sincerely, David L. Boyer, Sr. Geologist Greater Point Mclntyre Area r ov 18 MS Enclosures Please sign below and return to Marian Sloan, BPX, Mail Stop MB7-2 for reciept of transmittal. BP EXPLORATION (ALASKA) ANCHORAGE, ALASKA FAX # (907) 564-5193 TELECOPY COVER SHEET TO: COMPANY: LOCATION: Blair Wondzell AOGCC Anohora~l? FAX #: 276-7542 FROM: LOCATION: PAGES TO FOLLOW: 2 COMMENTS: Kathy Campoam.or i i ill i II . _ II SHARED SERVICES DRILLING ANCHORAGE, ALASKA PHONE #: 564-5122 I DATE: 11-14.97 Here is a revised summary of proposal to be attached with the 10-403 that was faxed on 11/10/97 for NK-41A. IF YOU DO NOT RECEIVE ALL PAGES, OR HAVE ANY PROBLEMS, PLEASE CALL THE FOLLOWING NUMBER: (907) 564-5122 ~NI99I~ S33IA2J3S {[3~UHS Nd60:t~0 TONY KNOWLE$, GOVE/~NOB ALASKA OIL AND GAS CONSERVATION COMMISSION 3001 PORCUPINE DRIVE ANCHORAGE, ALASKA 99501-3192 PHONE: (907) 279-1433 FAX: (907) 276-7542 August 15. 1997 Steve Shultz Senior Drilling Engineer BP Exploration (Alaska) Inc. ?OBox 196612 Anchorage. AK 99519-6612 Niakuk NK-41A BP Exploration (Alaska) Inc. Permit No. 97-158 Sur. Loc. 1474'NSL. 717'WEL. Sec. 36. TI2N. RI5E. UM Btmnhole Loc. 1171 'NSL. 4970'WEL. Sec. 22. T12N. R16E, UM Dear Mr. Shultz: Enclosed is the approved application for permit to redrill the above referenced well. The permit to redrill does not exempt you from obtaining additional permits required by laxv from other governmental agencies, and does not authorize conducting drilling operations until all other required permitting determinations are made. Blowout prevention equipment (BOPE) must be tested in accordance with 20 AAC 25 035. Sufficient notice (approximately 24 hours) must be given to allow a representative of the Commission to witness a test of BOPE installed prior to drilling ne,,,,, hole. Notice may be given inspector on the North Slope pager at 659-3607. _ \ Chairman BY ORDER OF THE COMMISSION dlffEnclosures CC' Department of Fish & Game. Habitat Section w/o encl. Department of Environmental Conservation w/o encl. STATE OF ALASKA ALASKA ~:,L AND GAS CONSERVATION COrv:~,ISSlON PERMIT TO DRILL 20 AAC 25.005 la. Type of work [] Drill [] Redrill Ilb. Type of well I--I Exploratory [] Stratigraphic Test [~ Development Oil [] Re-Entry [] DeepenI []Service [] Development Gas [] Single Zone [] Multiple Zone 2. Name of Operator 5. Datum Elevation (DF or KB) 10. Field and Pool BP Exploration (Alaska) Inc. Plan RTE = 60.2' Niakuk Oil Pool 3. Address 6. Property Designation P.O. Box 196612, Anchorage, Alaska 99519-6612 ADL 312827 1 4. Location of well at surface 7. Unit or Property Name 1. Type Bond (See 20 AAC 25.025) 1474' NSL, 717' WEL, SEC. 36, T12N, R15E Niakuk At top of productive interval 8. Well Number Number 2S100302630-277 865' NSL, 1851' WEL, SEC. 21, T12N, R16E NK-41A At total depth 9. Approximate spud date Amount $200,000.00 1171' NSL, 4970' WEL, SEC. 22, T12N, R16E 08/22/97 12. Distance to nearest property line113. Distance to nearest well 14. Number of acres in property 15. Proposed depth (MD and TVD) ADL 034633, 1171'I No Close Approach 5646 24435' MD / 10340' TVD 16. To be completed for deviated wells 17. Anticipated pressure {see 20 AAC 25.035 (e) (2)} Kick Off Depth 17800' Maximum Hole Angle 70.1° Maximum surface 3940 psig, At total depth (TVD) 10340' / 4970 psig 18. Casing Program Specifications Setting Depth Size Top Bottom Quantity of Cement Hole Casing Weight Grade Coupling Length MD TVD MD TVD (include stage data) 8-1/2" 7" 29# L-80 Hydril 511 6924' 17511' 8061' 24435' 10430' 790 sx Class 'G' 19. To be completed for Redrill, Re-entry, and Deepen Operations. Present well condition summary Total depth: measured 23330 feet Plugs (measured) Cement Plug with 500 bbls Class 'G' from 17800'-23330' true vertical 10000 feet ORIGINAL Effective depth: measured 17800 feet Junk (measured) true vertical 8155 feet Casing Length Size Cemented MD TVD Structural Conductor 80' 20" 260 sx Arcticset (Approx.) 80' 80' Surface 7000' 13-3/8" 3360 sx PF 'E', 1190 sx 'G', 50 sx PF 'C' 7041' 4864' Intermediate 17661' 9-5/8" 740 sx Class 'G' 17620' 8048' Production ~' ~ ~? ~ }~ AU¢ I~ 1997 Perforation depth: measured N/A ~'/85E~ 0~J o ..... c~. uaS CONS,uo~.,~dS~'* ~'- true vertical 20. Attachments [] Filing Fee [] Property Plat [] BOP Sketch [] Diverter Sketch [] Drilling Program [] Drilling Fluid Program []Time vs Depth Pict [] Refraction Analysis [] Seabed Report [] 20 AAC 25.050 Requirements Contact Engineer Name/Number: Larry Wolfson, 564-5510 Prepared By Name/Number: Kathy Campoamor, 564-5122 21. I hereby certify that the foregoing isttrue and correct to the best of my knowledge Si,.q,ned '~~ ~,,~ ¢.~f4;)~ ~(~'~.--SteveShultz Title Senior Drillin9 Engineer Date ~t ~1, -~- -__ Commission Use Only Permit Number APl Number I Appj'oval_Date I See cover letter /~/~-/',.~"~ 50-o,2..~- 2"~"77<~::~'~/I ~( ~'"blc~''~I for other requirements Conditions of Approval: Samples Required []Yes J~ No Mud Log Required~ []Yes [~ No Hydrogen Sulfide Measures J~Yes []No Directional Survey Required J~Yes []No Required Working Pressure for BOPE []2M; [--13M; [~5M; I--I10M; [--115M Other: Original Signed By by order of Approved BY I}¢Jvid W_ ,Inhn.~fnn Commissioner the commission Dst-~ ........... F~rrn 10-401 Rev. 12-01-85 Submi' In JFri~)licate NK-41A Well Plan Summary Surface Location: 1474' FSL 717' FEL Sec 36 T12N R15E Target Location: 865' FSL 1851' FEL Sec 21 T12N R16E Bottom Hole Location: 1171' FSL 4970' FEL Sec 22 T12N R16E I AFE Number: I 731190 I Estimated Start Date: I IMD: I 24,435' 8/22/97 I Operating days: ITVD: I 10,340, Pool #7 I 29 IKBE: I 60.2' I Type of Well (producer or injector): ]Well Design (conventional, slimhole, etc.): Producer Conventional / ERD Formation Markers: (all depths RKB) Measured True Vertical Formation Mud Formation Tops Depth, ft Depth, ft Gradient, ppg Weight, ppg Shale Wall/Tuffs 19,851 8,870 8.80 9.8 HRZ 21,158 9,310 9.40~ 10.22 Kuparuk 21,819 9,540 9.40 10.2 Target-Pink 22,113 9,640 9.35 10.2 Reflector Kingak 22,774 9,865 9.40 10.2 Sag River 22,980 9,935 9.35 10.2 Shublik 23,200 10,010 9.35 10.2 Ivishak 23,418 10,084 9.30 10.2 Kavik 24,170 10,340 9.30 10.2 TD 24,435 10,430 9.30 10.2 Casing/Tubing Program: (all depths feet RKB) Hole Size Csg/Tbg Wt/Ft Grade Conn. Length Top Btm OD MDfrVD MDfrVD Casing set in original wellbore: 30" 20" 94# H-40 WLD 80 GL 80/80 16" 13 3/8" 68# L-80 BTC 7000 GL 7041/4864 12 1/4" 9 5/8" 47# L-80 BTC-M 17661 GL 17620/8048 Casing/Tubing planned for sidetrack: 8 1/2" 7" 29# L-80 Hydril 511 6924 17511/8061 24435/10430 N/A 4 1/2" 12.6# L-80 IBT-Mod 21700 GL 21700/9500 I HRZ pressure gradient assumed to be same as Kuparuk. 2 Minimum mud weight required for shale stability. NK-41A Drilling Permit -. ~J Rev 0 Logging/Formation Evaluation Program: Production MWD/GR; DWOB/DTOQ CDR/ADN; CDR equipped w/PWD (Pressure While Drilling tool) Wireline: Schlumberger RFT/BHC Cased Hole Logs: Schlumberger USIT/Continuous Gyro Mud Program: Sidetrack (17800'-24435'): Mineral Oil Base Mud Interval Density PV YP LSR YP Electric Fluid (ppg) Viscosity Stability Loss Initial 9.6-9.8 15-20 15-20 10-12 700-1000 <6 HTHP HRZ 10.2-10.4 20-30 15-20 10-12 700-1000 <5 HTHP Interval TD 10.4 20-30 15-20 10-12 700-1000 <5 HTHP Mud Disposal Mud and cuttings will be hauled-off Heald Point and disposed at the appropriate facility. Cementing Program Hole Category Casing Volume Type of Cement Properties Size/Depth Surface (Actual) 13 3/8" @ Lead Lead Lead First Stage 7,041' 840 sx Permafrost "E" Den 12.0 ppg 325 bbls Yield 2.17 ft 3/sx Water 11.6 gps Tail Tail Tail 1190 sx Class "G" w/ Den 15.8 ppg 244 bbls 0.2 % CFR-3, Yield 1.15 ft 3/sx ............................................................................................................................. La..d...?..4...4.. ................ ...W...a..t..e..r.. ........ .5......0...gp..s. .................. Second Stage Stage collar Lead Lead Lead @ 1,991' 2520 sx Permafrost "E" Same as above 974 bbls Tail Tail Tail 50 sx Permafrost "C" Den 15.6 ppg 9 bbls Yield 0.94 ft 3/sx Water 3.5 gps Intermediate 9 5/8" @ 740 sx Class "G" w/ Den 15.8 ppg (Actual) 17,661' 152 bbls 0.2 % CFR-3 Yield 1.15 ft 3/sx 0.2 % Halad 344 Water 5.0 gps 0.1% HR-5 .... ,~s~a _Oil .& L-las Cons. Cornn'~is~; , 13/97 LW ..~ NK-41A Drilling Permit ...... ' Rev 0 Production (Planned) 7" @ 24,435' 790 SX1 169 bbls Class "G" w/ 2.0 gps Latex 0.36 gps 434B 0.05 gps D3 1.0 % Gel 0.4 % CFR-3 0.1% HR-5 Den 15.6 ppg Yield 1.2 ft 3/sx Water 3.5 gps TT Batch mix + 4.5 + hrs Directional: KOP: Max. Hole Angle: Close Approach Wells: Survey Program: 17,800' Begin 31.7° right turn at 3.0°/100 ft Initial: 69.0° @ 50.1° azimuth 70.1° 18,790'-24,435'; Final: 70.1° @ 81.8° azimuth None 17,800' - TD MWD surveys Surface- TD GyrowGyrodata continuous mode4uring completion Drilling Hazards/Risks Reservoir Pressure This will be the first well in this area of the Niakuk field and the reservoir pressures are based on RFT data from Sag Delta 8wsee Formation Markers. The maximum anticipated surface pressure is estimated at 3940 psi based on a reservoir pressure of 4970 psi at the base of the Ivishak at 10,340' TVD. Lost Circulation/Faults The fault 600' north of the well has a 200' throw and the fault 410' to the south has a 140' throw; crossing these faults in the reservoir section could cause lost circulation. Close Approaches There are no close approaches in the sidetrack. Sag Delta 8 is the only nearby well and it is nearly 2,000' to the west of the proposed bottom hole location. Well Control: Well control equipment consisting of 5000 psi WP pipe rams, blind rams, and annular preventer will be installed and is capable of handling maximum potential surface pressures. Diverter, BOPE and mud fluid system schematics on file with AOGCC. 1 1000' above T. Kuparuk, open hole volume (9 3/4" x 7") + 80' shoe joint; actual hole volume based on caliper. 3 08/13/97--LW NK-41A Drilling Permit ~- Rev 0 Operations Summary 1. Run in with open-ended drill pipe and cement stinger to 100' below any hydrocarbon bearing zones and set a cement plug with a volume sufficient to extend 100' above the zone. Set a kick-offplug, tov,-~t t~o~ a,-~t,,~ ~o.d~'i,, ~,te r~o+ ~f~c,'¢,-c. 2. P/U 8 1/2" BHA; polish off the cement plug to 17,800' and sidetrack the existing well. Drill per the attached plan to TD @ 24,435'. 3. Run open hole logs. 4. Run and cement 7" production liner. 5. Run cased hole logs. 6. Run 4 1/2" completion. Set packer and test tubing to 4000 psi; annulus to 3500 psi. Freeze protect well. 7. ND BOP and NU tree assembly. Test tree assembly to 5000 psi. 8. Secure well and release rig. Contacts: Office Home Pager SSD Drilling Superintendent Adrian Clark 564-4720 345-9066 275-1779 Senior Drilling Engineer Steve Shultz 564-5405 373-1657 275-9459 Operations Drlg Engr Larry Wolfson 564-5510 345-6624 275-1711 Asset Drilling Engineer Dan Stone 654-4002 348-0239 Attachments · Directional Plan · AOGCC Spacing Exception Approval · Letter of Non-Objection from BPX · Letter of Non-Objection from ARCO · Plat of Nearby Wellbores 4 08/13/97--LW SHAR'ED SERVIbES-DRILLiNG, ,, ,, , '] ~na~]], sc~Zu~e~ge,',, NK-4~ (ST) (P~) (75-? Tgt) VERTICAL SECTION VlE1N K _ _ /~NADR~LL AKA-DPC FEA,$1B1.1~') PLI~N ITVO ._ NOTAP[ 'RO~ 'ED ' :OR ID~ Scale.] I ~ch ~00 te~t EXEI :UT ON PI_AN - ~ .. ,_ - Marker ]dentific,tian MD BKB SEC~N INCLI .................... A) lIE-IN SURVEY ~771~ 8}25 tt34D 7t.OI C) END " D) TG1 JPINK ~FLECIDBJ 22~3 9640 t54~0 70.~ F) --,. ',*~~o~-'~ -~ " E , ............... ..... ii 0 ]200 2400 3600 4800 6000 7200 8400 9BO0 IOBO0 1~000 13200 14400 ~5600 16800 lBO00 tg200 20400 Sect ion Departure ~na~t Il (cl ~ NK4t5~ 3,OC 4:29 PH P) z F- SHARED SERVICES DR[LLZ~IG!' ' /)nadrJ ] ]$ch]umberger ii il i i i · ii i i i NK-41 (ST)[Pl)[75-2 Tgt) VERTICAL SECTION VIEW .... L AKt~*D~C--'----- JSection at: 82.71 AI4ADRII ITVD Scale.: 1 inch : 1000 feet FEASIBI .ITY PLAN - AFl" ....;,,,.,, ,-. r.,, r..r~o Iorawn ..... : 07 Aug ~.997 IqOT ~u v c~ r A~ ,~ ~, /.~'~.j'' ~rl(er I,entif,cat,an 14D BKB SEClN INCI' bi ~,'-'' --..~.¢,w~¢,--- Al lIE-IN SURVEY !1771! 8125 1'1340 71.0 '.... ~_~=~.===:~~~~ ~ BI KOP CURVE 3/100 17800 8155 11411!1 6§.0 "', C) END 3/~00 CURVE IB7g0 8509 122B5 70.1, ~- O) IGT IPINK ~FLECTOR) 22113 9640 ~5410 70.1 ''-... E) 7' LNR PT <)~ > 24435 ~0430 17592 70.! '.. F) 1D 24435 ~0430 17592 70.! ___ T~~_..__.~_. .......... '" 'fl~'kili,~'~ - 3~' ............... .... ' ............ m~ ._;_%~__ _ .......................... : ................................ ,,,, ~ ...... ~ ........... ..... '~'k~Ik' ~q~<i~ ~ I ........... E ........ .,_ I 9000 9500 tO000 t050O ilO00 i 1500 i2000 12500 13000 13500 14000 ]4500 i5000 i5500 16000 16500 i7000 ~7500 tBO00 Section Departure f~dri]] (C)97 14K4ISTPI 3.0C 4:30 Pa PI z ,, iii iii i Anadri ]] Sch}umberger NK-4~ (ST)(P~/ [75-2 Tgt) PLAN VZEN i! CLOSURE ~9371 feet at Azimuth 57.96 DECLINATION SCALE DRAHN Marker Al TIE-IN B) KOP C) END D) TGT E] 7" ~] 1o SHARED S'ERVICES DRILLING IATION,' +28,754 (E} J ' 1 inch = 2400 feet ' 07 Aug ]997 .... Ident i ficat ion J,4O N/$ £/~/ ~ - 'IN SURVEY 17711 9094 N 10269 E l~J,get CURVE 3/100 17800 914B N 10333 E 3/100 CURVE 18790 9520 N 11168 E _ (PINK REFLECIOR} 22~3 9965 N 14260 E .NR PT <J I> 24435 10276 N 16421 E 24435 10276 N 16421 E ......... ,,. A, ~IADRI .l A.~ ~,-DPC FEASIBfI.ITY' PL~ N I' ~OT APP '~OVFr~ // '" XEC .... "" E UTI()N I:'L,'~,N __ 1200 0 1200 2400 3600 4800 6000 7~00 8400 9600 iOBO0 12000 13200 14400 15600 IGBO0 lBO00 19200 20400 <- I~EST ' EAST -> O~.~rlll (cl97 NK41STP! 3.0C 4'.ID F'N PI z ~-~ m I /Inadri]l'"Sch]umberger i NK-~ [ST)(Pi)(75-2 Tgt) PLAN VIE~ t§37] feet CLOSURE ' at Azimuth 57.96 SHARED SERVICES DRILLING E) F) 13000 1~500 2000 1500 i i i i m i II I I ECLINATION.' +28.754 (E) ,CALE · 1 inch: 1000 feet RAW)I ' 07 Aug 1997 larker Ident i f kcat ion MD N/S E/W i ,1 VIE-IN SURVEY 17711 9094 N 10269 E ) KDP CURVE 3/100 17800 9148 N )0333 E A);A-DPC )) TGI (PI~ ~FLECIBR) 22113 99~ N 142~ E ...... ~'~a ~ -- .,. ,~ · .... ,, .... ~ .... ....... [ .. 8000 8500 9000 9501) lO000 ~0500 llOOO 11500 ]2000 )25(]0 13000 13500 14000 14500 15000 15500 16000 16500 , EASI ~naclri]) lc)g? 1~4iSlPl ~i. OC 4:34 Pll 17000 lO000 z H "o m 'D AUG1 11997 STATE OF ALASKA · -~,D ©EPT. ALASKA OIL AND GAS CONSERVATION COMMISSION F-: F-~ ~,~ E [ V EE D 3001 Porcupine Drive AU~ J ~ ~J~ Anchorage Alaska 99501-3192 EPZ- LAND DEPT, Re: THE APPLICATION OF BP ) EXPLORATION (ALASKA) ) INC. for an order granting an exception ) to spacing requirements of Title ) 20 AAC 25.055 to provide for the ) drilling of the BP Niakuk 41 ST ) exploration oil well. ) ) Conservation Order No. 398 BP Exploration (Alaska), Inc. Niakuk 41 ST exploration oil well August 4, 1997 IT APPEARING THAT: BP Exploration (Alaska), Inc. submitted an application dated July 1, 1997 requesting exception to 20 AAC 25.055(a)(1) to allow drilling the BP Niakuk 41 ST exploration oil well to a location in an undefined Pool within the Ivishak Formation that is closer than 500 feet to a quarter-section line. . Notice of opportunity for public hearing was published in the Anchorage Daily News on July 17, 1997. 3. No protests to the application were received. FINDINGS. . The BP Niakuk 41 ST well as proposed will be a deviated hole drilled from a surface location 1474' from the south line (FSL) and 717' from the east line of Section 36. T12N, R15E. Umiat Meridian (UM)and the proposed bottomhole location is 1121' FSL and 179' from the west line of Section 22. T12N, R16E, 2. Offset owner ARCO Alaska. Inc. has been duly notified 3. An exception to 20 AAC 25.055(a)(1) is necessary to allow- drilling of this well. CONCLUSION: Granting a spacing exception to allow drilling of the BP Niakuk 41 ST exploration well as R proposed will not result in waste nor jeopardize correlative rights. L~ ,,....: , : -i997 0il & Gas Cons. Oommiss" Anchorage Conservation Order No."~ ... 8 August 4. 1997 Page 2 NOW, THEREFORE, IT IS ORDERED: BP Exploration (Alaska), Inc.'s application for exception to 20 AAC 25.055 for the purpose of drilling the Niakuk 41 ST exploration well is approved as proposed. DONE at Anchorage, Alaska and dated August 4, 1997. Alaska O~ervation comm-'~ssion Robert N ~lstenson, P E Comm~ssloner Alaska Oil and Gas Conservation Commission AS 31.05.080 provides that within 20 days after receipt of written notice of the entry, of an order, a'person affected bx' it may file with the Commission an application tbr rehearing. A request for rehearing must be received by 4:30 PM on the 23rd day lbllowing the date of the order, or next working day ifa holiday or weekend, to be timely filed. The Commission shall grant or refuse the application in whole or in part within 10 davs. The Commission can refuse an application by not acting on it within the 10-day period. An affected person has 30 davs from the date the Commission refuses the application or mails (or otherwise distributes) an order upon rehearing, both being the final order of the Commission. to appeal the decision to Superior Court. Where a request lbr rehearing is denied bv nonaction of the Commission. the 30-day period for appeal to Superior Court runs from the date on which the request is deemed denied (i.e.. 10th day after the application for rehearing was filed). BP EXPLORATION BP Exploration (Alaska) Inc. 900 East Benson Boulevard RO. Box 196612 Anchorage, Alaska 99519-6612 (907) 561-5111 August 12, 1997 David Johnston, Commissioner Alaska Oil and Gas Conservation Commission 3001 Porcupine Drive Anchorage, Alaska 99501-3192 Letter of Non-Objection for NK-41A Dear Commissioner Johnston: BP Exploration (Alaska), Inc. ("BPX") as an affected owner per 20 AAC 25.050 (h) does not object to drilling the proposed deviated well NK-41A through BPX Lease ADL-34635 to a bottomhole location in Section 22 of BPX and ARCO's Lease ADL-312827. Pursuant to 20 ACC 25.050(d)(2) this letter of non- objection is provided so you may issue the drilling permit without a 15-day notice period. Sincerely, ,FROM: ,, GPI,11::I I:INCHORI:II~E FI:IX NO.: ,~d:iCO ~ld~ml~ Inc. ~ P~st Office 1~3X 100360 Anchorago, Alaska 99510-0360 Telephone 907 276 1215 2554894 August 13, 1997 Mr. David W. Johnston, Chairman Alaska O[I and Gas Conservation Commission 3001 Porcupine Drive Anchorage, Alaska 99501-3192 via fax and mall Re: Letter of Non. Objection for Well NK-41A Dear Mr. Johnston: As an affected property owner, ARCO Alaska, Inc. has no objection to the directional drilling NK.41A, a sidetrack of NK-41, from .the 9-5/8" casing point of NK-41 to the Kuparuk and Sag River / Ivishak targets on BPX and ARCO Lease ADL-312827. Sincerely, J. W. Groth CC; J. A. Leone (ARCO) I. Springett (BPXA) STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION 3001 Porcupine Drive Anchorage Alaska 99501-3192 Re' THE APPLICATION OF BP ) EXPLORATION (ALASKA) ) INC. for an order granting an exception ) to spacing requirements of Title ) 20 AAC 25.055 to provide for the ) drilling of the BP Niakuk 41ST ) exploration oil well. ) ) Conservation Order No. 398 BP Exploration (Alaska), Inc. Niakuk 41ST exploration oil well August 4, 1997 IT APPEARING THAT: BP Exploration (Alaska), Inc. submitted an application dated July 1, 1997 requesting exception to 20 AAC 25.055(a)(1) to allow drilling the BP Niakuk 41 ST exploration oil well to a location in an undefined Pool within the Ivishak Formation that is closer than 500 feet to a quarter-section line. Notice of opportunity.' for public hearing was published in the Anchorage Daily News on July 17, 1997. 3. No protests to the application were received. FINDINGS: The BP Niakuk 41 ST well as proposed will be a deviated hole drilled from a surface location 1474' from the south line (FSL) and 717' from the east line of Section 36. T12N, R15E, Umiat Meridian (UM) and the proposed bottomhole location is 1121' FSL and 179' from the west line of Section 22. T12N. R16E, UM. ~ 2. Offset owner ARCO Alaska. Inc. has been duly notified o An exception to 20 AAC 25.055(a)(1) is necessary, to allow drilling of this well. CONCLUSION: Granting a spacing exception to allow drilling of the BP Niakuk 41ST exploration well as proposed will not result in waste nor jeopardize correlative rights. ~ALASKA~ .eare,d rvlces rilling BP Exploration / Arco Alaska Date: To: From: Subject: August 13, 1997 Alaska Oil & Gas Conservation Commission Kathy Campoamor Technical Assistant NK-41ST, should be NK-41A NK-41 ST was named incorrectly when we submitted the spacing exception request and conservation order, Please reflect your records to show that the correct well name should be: NK-41A, I apologize for any inconvenience this may have caused. Thank you for your assistance and patience in this matter. /klc AUG 1 4 1997 DATE INVOICE / CREDIT MEMO DESCRIPTION GROSS DISCOUNT NET ~. ?~.._'7 ?: THE ATTACHEO CHECK IS IN PAYMENT FOR rTEMS DESCRIBED ABOVE. · WELL PERMIT CHECKLIST COMPANY /'~,~2 WELL NAME/¢.~,,~ --- (-~//,~ AREA' PROGRAM: exp [] dev ~;~'redrll/~i![serv [] wellbore seg [] ann. disposal para req © 4;~ UNIT# ~ ,~, ON/OFF SHORE ,,'5,'l) / -- ADMINISTRATION ENGINEERING APPR DATE . 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. ¢, REMARKS , ., < ,/ 4 Permit fee attached ....................... (~ N -~ ~ ~' ,-~ ~ ~/,,"" ~,~ /',5' ~/'/~,.¢',~,~.,, .~_,.?z.,/,.,,..~ ~_____~ Lease number appropriate ................... N Unique well name and nu mb er .................. ~. N,~ _~ ~;~?~).2..,~/,~, ~.4 ¢~,,J'~ ~_ ~__~)_// Fo //~___ /~'~¢' '~ ~ Z.-4.~.('" Well located in a defined pool .................. Y f / ~' / - Well located proper distance from drilling unit boundary .... -',, ' . o/ /.:,, '- . './' - ' / Well located proper distance from other wells .......... ~N Sufficient acreage available in drilling unit ............ N - ~ / '/ -- -- /Z ' If deviated, is wellbore plat included ............... (~NN .,~.-~__ O_~_,?4zl,~/ /Z~,..,/ fff__~/ ~_.z¢ O,,f'~...~y~,. ~ ~ --~ ~' Operator only affected party ................... Operator has appropriate bond in force ............. ~_y..~,~; ., ' ~ ' /~ ' Permit can be issued without conservation order ........ Y~>~T~'7~'r~_~~) ~:~,,~ff~,..¢ ~/~0__ J~'e.~]/~6'~'/ /O_.~F'n::>~Fm /ch Permit can be issued without administrative approval ...... N .... ,' / ' ~ ....... '-",?'. ~.. - Can permit be approved before 15-day wait ........... ~Y N ~__~. Conductor string provided ................... Y N j.,~ _z¢¢ '.~ ' ' Surface casing protects all known USDWs ........... ~}N :~.C~.~.~//'/ g~ P~,.~_~.~ ~,~.~ 4~_O_,____Z_./~/.~_,,~_..../~_ ~:~,// ~:::~"~ CMTvol adequate to circulate on conductor& surf csg ..... i/!/~DL....~'.?.~.2 74~..~.~ ~ fo2~ ~>~ D,.~t- .~-- ' CMT vol adequate to tie-in long string to surf csg ........ CMT will cover all known productive horizons .......... Y N Casing designs adequate for C, T, 13 & permafrost ....... ,..Y. JY~N ......... Adequate tankage or reserve pit ................. If a re-drill, has a 10-403 for abandonment been approved... Y N Adequate wellbore separation proposed ............. If diverter required, does it meet regulations .......... Y N Drilling fluid program schematic & equip list adequate ..... I1NiN BOPEs, do they meet regulation ................ Y N BOPE press rating appropriate; test to __e'-d:x_c,~'~_ psig. Choke manifold complies w/APl RP-53 (May 84) ........ Work will occur without operation shutdown ........... Is presence of H2S gas probable ................. GEOLOGY DATE,) 30. Permit can be issued w/o hydrogen sulfide measures ..... ~N ~ Y N ./~.//6/~ 31. Data presented on potential overpressure zones ....... ., 32. Seismic analysis of shallow gas zones ............. 33. Seabed condition survey (if off-shore) ............. 34. Contact name/phone for weeklyproqress reports / //Y N [expioratory only] ...... / Y N GEOL.,~Y: ENGINEERING: COMMISSION: JDH -,,-- RNC~ Comments/Instructions: HOW/Ijt - A:\FORMS\cheklist rev 07/97
