The URL can be used to link to this page

Home My WebLink AboutAIO 026 CINDEX AREA INJECTION ORDER NO. 26C Prudhoe Bay Unit 1. April 18, 2023 Hilcorp application for expansion of PBU, Schrader Bluff Oil Pool (confidential exhibits held in secure storage) 2. April 20, 2023 Notice of Hearing; affidavit of publication, email Distribution 3. December 15, 2025 Hilcorp Request for produced water injection with a high set packer (AIO 26C.001) STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION 333 West 7th Avenue Anchorage Alaska 99501 Re: THE APPLICATION OF HILCORP NORTH SLOPE, LLC for an order expanding the area in which injection is authorized in the Schrader Bluff Oil Pool, Prudhoe Bay Field, North Slope, Alaska ) ) ) ) ) ) ) ) Docket Number: AIO-23-007 Area Injection Order 26C Prudhoe Bay Field Schrader Bluff Oil Pool Orion Development Area August 30, 2023 IT APPEARING THAT: 1. By letter dated April 18, 2023, Hilcorp North Slope, LLC (Hilcorp) requested the Alaska Oil and Gas Conservation (AOGCC) grant an expansion to the affected area of Area Injection Order No. 26B (AIO 26B), which governs injection operations for the Orion Development Area of the Schrader Bluff Oil Pool (OA-SBOP) within the Prudhoe Bay Unit (PBU). 2. Pursuant to 20 AAC 25.540, the Alaska Oil and Gas Conservation Commission (AOGCC) scheduled a public hearing for June 13, 2023. On April 20, 2023, the AOGCC published notice of that hearing on the State of Alaska’s Online Public Notice website and on the AOGCC’s website, electronically transmitted the notice to all persons on the AOGCC’s email distribution list and mailed printed copies of the notice to all persons on the AOGCC’s mailing distribution list. On April 23, 2023, the notice was also published in the Anchorage Daily News. 3. No protest to the application or request for hearing was received. 4. Because Hilcorp provided sufficient information upon which to make an informed decision, the request can be resolved without a hearing. 5. The tentatively scheduled hearing was vacated. 6. By letter dated August 8, 2023, Hilcorp requested an amendment to their initial request to exclude a quarter section (40 acres) that is already in the Polaris Oil Pool which includes the same strata as the OA-SBOP. FINDINGS: 1. AIO 26, issued January 5, 2004, approved water injection for enhanced recovery purposes within the OA-SBOP and set forth rules for conducting injection operations. 2. AIO 26A, issued May 1, 2006, superseded AIO 26 and approved injection of enriched hydrocarbon gas for enhanced recovery purposes. 3. AIO 26B, issued May 4, 2010, amended April 15, 2014, and corrected February 3, 2021, expanded the affected area. 4. Hilcorp proposes to expand the affected area of AIO 26B to match the proposed expansion of the OA-SBOP: extending the western boundary to the border between the Prudhoe Bay Unit (PBU) and Kuparuk River Unit (KRU) and to the east to reflect the current interpretation of the limits of the pool. The current affected area and the proposed expanded OA-SBOP are shown in Figure 1. Area Injection Order 26C August 30, 2023 Page 2 Figure 1. Existing and Proposed Affected Areas for Enhanced Oil Recovery Injection in the Orion Development Area of the Schrader Bluff Oil Pool within the PBU. (Source: Hilcorp North Slope, LLC.) 5. Hilcorp has expanded the L Pad drill site in the PBU and has identified and drilled targets in the Schrader Bluff Formation (Schrader Bluff) to the west of the current limits of the OA-SBOP. 6. Wells targeting the deeper Borealis Oil Pool penetrated the Schrader Bluff and show oil is present in the proposed, expanded area. These wells include PBU L-100 (API No. 50-029-22858-01-00) and PBU L-112 (API No. 50-029-23129-00-00). Exploratory well PBU NWE 01-01 (API No. 50-029-22858-00-00) also shows oil is present in the Schrader Bluff at this locality. These three wells were drilled to the west of L Pad. Borealis development well PBU L-121 well (API No. 50-029-23138- 00-00), which was drilled to the south of L Pad, also shows oil is present in the Schrader Bluff. 7. Hilcorp has drilled wells targeting the Schrader Bluff east of V Pad and north of Z Pad in the PBU that show the Schrader Bluff would be productive outside the existing OA-SBOP boundaries. These wells include PBU V-227A (API No. 50-029-23417- 01-00) and PBU W-241 (API No. 50-029-23741-00-00). 8. On July 10, 2023, the AOGCC approved a gas-oil ratio limitation waiver for PBU L- 253 (API No. 50-029-23758-00-00) and PBU L-254 (API No. 50-029-23752-00-00), which were drilled to the Schrader Bluff to the west of the existing OA-SBOP boundary and confirm that the OA-SBOP extends beyond its current defined limits to the west. 9. The PBU in this portion of the field is bordered to the west by the KRU and to the Area Injection Order 26C August 30, 2023 Page 3 north by the Milne Point Unit (MPU). 10. The Schrader Bluff extends across a large area of the North Slope and is productive in the PBU, KRU (where it is called the West Sak Oil Pool), MPU, and Nikiatchuq Unit (NU). All four of these units are operated by different companies. PBU is operated by Hilcorp North Slope, LLC, MPU is operated by Hilcorp Alaska, LLC (which is owned by the same parent company as Hilcorp North Slope, LLC), KRU is operated by ConocoPhillips Alaska Inc., and NU is operated by ENI Us Operating Co. Inc. There are similarities and differences in the way these four companies develop Schrader Bluff reservoirs. 11. There are multiple sands in the Schrader Bluff, not all of which are productive across all four units where the Schrader Bluff is produced. 12. 20 AAC 25.055(a)(1) prohibits oil wells from being completed within 500 feet of a property boundary where ownership is not the same on both sides of the line without an order from the AOGCC. CONCLUSION: 1. Drilling activity in the PBU has clearly demonstrated that the Schrader Bluff is productive beyond the current affected area specified by AIO 26B, and thus the affected area should be expanded. 2. The Schrader Bluff hydrocarbon accumulation extends across PBU, KRU, MPU, and NU and comprises a single oil pool per AOGCC statutes. 3. Each unit from which the Schrader Bluff is produced has a different operator. 4. Area Injection Orders, as described in 20 AAC 25.460(a)(3), are limited by to a single operator and thus the affected area must be constrained to the unit boundary. 5. Correlative rights of owners and landowners of offset acreage are protected by a 500-foot set-back requirement from a property line where landowners and owners are not the same. However, this may not ensure the maximum ultimate recovery due to potential waste of resources along these property lines. Under certain circumstances, a waiver to permit a well to be drilled within 500’ of a property line may allow for an increase in ultimate recovery while simultaneously protecting correlative rights. 6. Rules 9 and 10 repeat the regulations in 20 AAC 25 and should be eliminated. 7. Rule 11 of AIO 26B was superseded by 20 AAC 25.566(d). NOW, THEREFORE, IT IS ORDERED: This Area Injection Order supersedes AIO 26, AIO 26A, AIO 26B and all associated administrative approvals except AIO 26B.004, AIO 26B.005, AIO 26B.006, AIO 26B.007, and AIO 26B.008 which remain in effect. Underground injection of fluids for enhanced recovery is permitted subject to the conditions, limitations, and requirements established in the rules set out below, in Conservation Order 505C, and in statewide requirements contained in 20 AAC 25. The affected area of this order is: Area Injection Order 26C August 30, 2023 Page 4 Umiat Meridian Township Range, UM Lease Sections T12N-R10E ADL 025637 13 and 24 T12N-R11E ADL390067 14: S/2 S/2, 23: ALL, 24: SW/4 and SW/4 of NW/4 ADL 047446 17, 18, 19, and 20 ADL 047447 16 S/2, NW/4, and S/2 NE/4, 21, and 22 ADL 028238 25 SW/4, 26, 35, and 36 ADL 028239 27, 28, 33, and 34 ADL 047449 29, 30, and 32 T11N-R11E ADL 028240 1, 2, 11, and 12 ADL 028241 3, 4, 9, and 10 ADL 028244 15 ADL 028245 13, 14, and 24 E/2 of NE/4 T11N-R12E ADL 047450 5 SW/4, 6 S/2, 7, and 8 ADL 028263 16 SW/4 and S/2 of NW/4, and 21 SW/4, W/2 of SE/4, S/2 of NW/4, and NW/4 of NW/4 ADL 028262 17, 18, 19 N/2, SE/4, and N/2 SW/4, and 20 ADL 047452 28 W/2 and W/2 of E/2 ADL 047453 29 N/2 and N/2 of SE/4 Rule 1. Authorized Injection Strata for Enhanced Recovery (Edited for clarity this order) Fluids appropriate for enhanced oil recovery may be injected for purposes of pressure maintenance and enhanced recovery within the OA-SBOP into strata that are common to, and correlate with, the interval between measured depths of 4,549 feet and 5,106 feet in the PBU V-201 well and between the measured depths of 4,174 feet and 4,800 feet in Milne Point Unit A-1 well. Rule 2 Fluid Injection Wells (Source AIO 26) The underground injection of fluids must be through a well that has been permitted for drilling as a service well for injection in conformance with 20 AAC 25.005, or through a well approved for conversion to a service well for injection in conformance with 20 AAC 25.280 and 20 AAC 25.412 (e). Rule 3: Authorized Fluids for Enhanced Recovery (Source AIO 26B.002) Fluids authorized for injection are: a) Produced water and gas from Prudhoe Bay Unit processing facilities; b) Enriched hydrocarbon gas; c) Non-hazardous water and water-based fluids – (specifically seawater, source water, freshwater, domestic wastewater, equipment washwater, Area Injection Order 26C August 30, 2023 Page 5 sump fluids, hydrotest fluids, firewater, and water with trace chemicals, and other water based fluids with a pH greater than 2 and less than 12.5 and flashpoint greater than 140 degrees F); d) Fluids introduced to production facilities for the purpose of oil production, plant operations, plant/piping integrity or well maintenance that become entrained in the produced water stream after oil, gas, and water separation in the facility. Specifically: i. Freeze protection fluids; ii. Fluids in mixtures of oil sent for hydrocarbon recycle; iii. Corrosion/scale inhibitor fluids; iv. Anti-foams/emulsion breakers; v. Glycols vi. Radioactive tracer survey fluids e) Non-hazardous glycols and glycol mixtures; f) Fluids that are used for their intended purpose within the oil production process. Specifically: i. Scavengers; ii. Biocides g) Fluids to monitor or enhance reservoir performance. Specifically: i. Tracer survey fluids; ii. Well stimulation fluids; iii. Reservoir profile modification fluids. In addition, administrative approval AIO 26A.001, which specified additional authorized fluids, is hereby repealed. Rule 4. Monitoring the Tubing-Casing Annulus Pressure Variations (Source AIO 26A) The tubing and casing annuli pressures of each injection well must be monitored at least daily, except if prevented by extreme weather conditions, emergency situations, or similar unavoidable circumstances. Monitoring results shall be documented and made available for AOGCC inspection. Rule 5. Demonstration of Tubing-Casing Annulus Mechanical Integrity (Source AIO 26A) The mechanical integrity of an injection well must be demonstrated before injection begins, and before returning a well to service following a workover affecting mechanical integrity. AOGCC-witnessed mechanical integrity test must be performed after injection is commenced for the first time in a well, to be scheduled when injection conditions (temperature, pressure, rate, etc.) have stabilized. Subsequent tests must be performed at least once every four years thereafter. The AOGCC must be notified at least 24 hours in advance to enable a representative to witness mechanical integrity tests. Unless an alternate means is approved by the AOGCC, mechanical integrity must be demonstrated by a tubing/casing annulus pressure test using a surface pressure of 1,500 psi or 0.25 psi/ft multiplied by the vertical depth of the packer, whichever is greater, that shows Area Injection Order 26C August 30, 2023 Page 6 stabilizing pressure and does not change more than 10 percent during a 30-minute period. Results of mechanical integrity tests must be readily available for AOGCC inspection. Rule 6: Multiple Completion of Injection Wells (Source AIO 26A.002) a. Injectors may be completed to allow for injection in multiple pools within the same wellbore so long as mechanical isolation between pools is demonstrated and approved by the AOGCC. b. Prior to initiation of commingled injection, the AOGCC must approve methods for allocation of injection to the separate pools. c. Results of logs or surveys used for determining the allocation of injected fluids between pools, if applicable, must be supplied in the annual reservoir surveillance report. d. An approved injection order is required prior to commencement of injection in each pool. Rule 7: Well Integrity Failure and Confinement (Source AIO26A) Whenever any pressure communication, leakage or lack of injection zone isolation is indicated by injection rate, operating pressure observation, test, survey, log, or other evidence, the operator shall notify the AOGCC by the next business day and submit a plan of corrective action on a Form 10-403 for AOGCC approval. The operator shall immediately shut in the well if continued operation would be unsafe or would threaten contamination of freshwater, or if so directed by the AOGCC. A monthly report of daily tubing and casing annuli pressures and injection rates must be provided to the AOGCC for all injection wells indicating well integrity failure or lack of injection zone isolation. Rule 8: Notification of Improper Class II Injection (Source AIO 26) Injection of fluids other than those listed in Rule 3 without prior authorization is considered improper Class II injection. Upon discovery of such an event, the operator must immediately notify the AOGCC, provide details of the operation, and propose actions to prevent recurrence. Additionally, notification requirements of any other State or Federal agency remain the operator’s responsibility. Rule 9: Plugging and Abandonment of Fluid Injection Wells (Removed this order) Rule 10: Other conditions (Removed this order) Rule 11: Administrative Actions (Superseded by 20 AAC 25.566(d)) Area Injection Order 26C August 30, 2023 Page 7 DONE at Anchorage, Alaska, dated August 30, 2023. Brett W. Huber, Sr. Jessie L. Chmielowski Gregory C. Wilson Chair, Commissioner Commissioner Commissioner RECONSIDERATION AND APPEAL NOTICE As provided in AS 31.05.080(a), within 20 days after written notice of the entry of this order or decision, or such further time as the AOGCC grants for good cause shown, a person affected by it may file with the AOGCC an application for reconsideration of the matter determined by it. If the notice was mailed, then the period of time shall be 23 days. An application for reconsideration must set out the respect in which the order or decision is believed to be erroneous. The AOGCC shall grant or refuse the application for reconsideration in whole or in part within 10 days after it is filed. Failure to act on it within 10-days is a denial of reconsideration. If the AOGCC denies reconsideration, upon denial, this order or decision and the denial of reconsideration are FINAL and may be appealed to superior court. The appeal MUST be filed within 33 days after the date on which the AOGCC mails, OR 30 days if the AOGCC otherwise distributes, the order or decision denying reconsideration, UNLESS the denial is by inaction, in which case the appeal MUST be filed within 40 days after the date on which the application for reconsideration was filed. If the AOGCC grants an application for reconsideration, this order or decision does not become final. Rather, the order or decision on reconsideration will be the FINAL order or decision of the AOGCC, and it may be appealed to superior court. That appeal MUST be filed within 33 days after the date on which the AOGCC mails, OR 30 days if the AOGCC otherwise distributes, the order or decision on reconsideration. As provided in AS 31.05.080(b), “[t]he questions reviewed on appeal are limited to the questions presented to the AOGCC by the application for reconsideration.” In computing a period of time above, the date of the event or default after which the designated period begins to run is not included in the period; the last day of the period is included, unless it falls on a weekend or state holiday, in which event the period runs until 5:00 p.m. on the next day that does not fall on a weekend or state holiday. Brett W. Huber, Sr. Digitally signed by Brett W. Huber, Sr. Date: 2023.08.30 13:22:18 -08'00' Jessie L. Chmielowski Digitally signed by Jessie L. Chmielowski Date: 2023.08.30 13:33:17 -08'00' Gregory Wilson Digitally signed by Gregory Wilson Date: 2023.08.30 14:24:42 -08'00' Alaska Oil and Gas Conservation Commission 333 West Seventh Avenue Anchorage, Alaska 99501-3572 Main: 907.279.1433 Fax: 907.276.7542 www.aogcc.alaska.gov ADMINISTRATIVE APPROVAL AREA INJECTION ORDER 26C.001 Mr. Torin Roschinger PBW Operations Manager Hilcorp North Slope, LLC 3800 Centerpoint Drive, Suite 1400 Anchorage, AK 99503 Re: Docket Number: AIO-25-034 Request for Administrative Approval to Area Injection Order 26C: Water Injection Prudhoe Bay Unit L-291 (PTD 2240020), Orion Development Area, Schrader Bluff Oil Pool Dear Mr. Roschinger: By emailed letter dated December 15, 2025, Hilcorp North Slope, LLC (Hilcorp) requested administrative approval to continue water only injection with a high-set packer that reduces the monitorable inner annulus (IA). The packer design doesn’t meet the requirement of 20 AAC 25.412(b) that “an injector be equipped with tubing and a packer… the packer must be placed within 200 feet measured depth above the top of the perforations…”. The well, currently, has no known pressure communication integrity issues. In accordance with 20AAC 25.556(d), the Alaska Oil and Gas Conservation Commission (AOGCC) hereby GRANTS, subject to conditions, Hilcorp’s request for administrative approval to continue water only injection in the subject well. The completion of L-291 left the injection packer set at 13,096 ft measured depth (MD) which is 140 ft MD above the Schrader Bluff Oil Pool, and 308 ft above the shallowest open sliding sleeve/perforation of 13,404 ft MD. The high set packer effectively prevents tubing integrity verification by IA monitoring to the Schrader Bluff, so there is potentially an increased risk of fluids undetectably being injected outside of the approved injection zone. Hilcorp proposes additional testing and monitoring including a waterflow log to assure in zone injection and confinement of the injected fluids. On December 11, 2025, Hilcorp performed diagnostics including a passing non state-witnessed mechanical integrity test of the inner annulus (MITIA). This indicates that L-291 exhibits at least two competent barriers to the release of well pressure. Hilcorp maintains live transmitters on the inner and outer annulus and alarm and remote shut down functions in the Supervisory Control and Data Acquisition (SCADA) system that create layers of protection from an over-pressure event. AOGCC believes Hilcorp can safely manage AIO 26C.001 December 22, 2025 Page 2 of 3 injection operations with periodic pressure bleeds by maintaining the inner annulus to a pressure not to exceed 2,100 psi and the outer annulus not to exceed 1,000 psi. Accordingly, the AOGCC believes that the well’s condition does not compromise overall well integrity so as to threaten human safety or the environment. AOGCC’s approval to continue water only injection in PBU L-291 is conditioned upon the following: 1) Hilcorp shall record wellhead pressures and injection rate daily; 2) Hilcorp shall submit to the AOGCC a monthly report of well pressures, injection rates, and pressure bleeds for all annuli. Bleeds to be flagged on the report; 3) Hilcorp shall perform a MITof the inner annulus every two years to the greater of the maximum anticipated header injection pressure or 0.25 x packer TVD, but not less than 1,500 psi; 4) Hilcorp shall perform an initial waterflow log and subsequent log every two years with stations from 13,000-13,352 ft MD; 5) Hilcorp shall limit the well’s inner annulus operating pressure to 2,100 psi. Audible control room alarms shall be set at or below these limits; 6) Hilcorp shall limit the well’s outer annulus operating pressure to 1,000 psi. Audible control room alarms shall be set at or below these limits; 7) Hilcorp shall monitor the inner and outer annulus pressures in real time with its SCADA system; 8) Hilcorp shall immediately shut in the well and notify the AOGCC if there is any change in the well's mechanical condition; 9) After well shut in due to a change in the well's mechanical condition, AOGCC approval shall be required to restart injection; and 10) The next required MITIA is to be after the well is placed on injection and injection conditions (temperature, pressure, rate etc.) have stabilized. AOGCC must be provided the opportunity to witness the MIT for a test to establish a new test due date. DONE at Anchorage, Alaska and dated December 22, 2025. Jessie L. Chmielowski Gregory C. Wilson Commissioner Commissioner Gregory C Wilson Digitally signed by Gregory C Wilson Date: 2025.12.22 08:28:10 -09'00' Jessie L. Chmielowski Digitally signed by Jessie L. Chmielowski Date: 2025.12.22 08:37:57 -09'00' AIO 26C.001 December 22, 2025 Page 3 of 3 RECONSIDERATION AND APPEAL NOTICE As provided in AS 31.05.080(a), within 20 days after written notice of the entry of this order or decision, or such further time as the AOGCC grants for good cause shown, a person affected by it may file with the AOGCC an application for reconsideration of the matter determined by it. If the notice was mailed, then the period of time shall be 23 days. An application for reconsideration must set out the respect in which the order or decision is believed to be erroneous. The AOGCC shall grant or refuse the application for reconsideration in whole or in part within 10 days after it is filed. Failure to act on it within 10 days is a denial of reconsideration. If the AOGCC denies reconsideration, upon denial, this order or decision and the denial of reconsideration are FINAL and may be appealed to superior court. The appeal MUST be filed within 33 days after the date on which the AOGCC mails, OR 30 days if the AOGCC otherwise distributes, the order or decision denying reconsideration, UNLESS the denial is by inaction, in which case the appeal MUST be filed within 40 days after the date on which the application for reconsideration was filed. If the AOGCC grants an application for reconsideration, this order or decision does not become final. Rather, the order or decision on reconsideration will be the FINAL order or decision of the AOGCC, and it may be appealed to superior court. That appeal MUST be filed within 33 days after the date on which the AOGCC mails, OR 30 days if the AOGCC otherwise distributes, the order or decision on reconsideration. In computing a period of time above, the date of the event or default after which the designated period begins to run is not included in the period; the last day of the period is included, unless it falls on a weekend or state holiday, in which event the period runs until 5:00 p.m. on the next day that does not fall on a weekend or state holiday. From:Coldiron, Samantha J (OGC) To:AOGCC_Public_Notices Subject:[AOGCC_Public_Notices] Area Injection Order 26C.001 (Hilcorp) Date:Monday, December 22, 2025 10:21:25 AM Attachments:AIO26C.001.pdf Docket Number: AIO-25-034 Request for Administrative Approval to Area Injection Order 26C: Water Injection Prudhoe Bay Unit L-291 (PTD 2240020), Orion Development Area, Schrader Bluff Oil Pool Samantha Coldiron AOGCC Special Assistant Alaska Oil and Gas Conservation Commission 333 West 7th Avenue Anchorage, AK 99501 (907) 793-1223 __________________________________ List Name: AOGCC_Public_Notices@list.state.ak.us You subscribed as: samantha.coldiron@alaska.gov Unsubscribe at: https://list.state.ak.us/mailman/options/aogcc_public_notices/samantha.coldiron%40alaska.go v 3 Hilcorp North Slope, LLC Torin Roschinger, PBW Operations Manager 3800 Centerpoint Dr, Suite 1400 Anchorage, Alaska 99503 12/15/2025 Commissioners – Jessie Chmielowski, Greg Wilson Alaska Oil and Gas Conservation Commission 333 West 7th Avenue Anchorage, Alaska 99501 Subject: Prudhoe Bay Unit, Orion Oil Pool well L-291 (PTD #224002). Request for produced water injection with a high-set packer. Dear Commissioner Chmielowski and Commissioner Wilson, Hilcorp North Slope, LLC requests approval to allow for produced water injection (PWI) into Orion well L-291 with a high-set packer, limiting the monitorable well inner annulus. L-291 (PTD# 224002) was recently drilled as an Orion PWI well, completed on 12/11/2025. While running the 7” intermediate string, the planned casing shoe depth of 13645’ MD was not reached due to drilling issues and the casing was set high at 13352’ MD. This proceeded to cause spacing problems to meet both the requirements of 20 AAC 25.030(d)(6) and 20 AAC 25.412(b) in the final completion. To meet the requirements of 20 AAC 25.030(d)(6), the injection liner top was set at 13155’ MD, giving 197’ MD of liner overlap. This resulted in the injection packer setting depth not meeting the L-291 PTD COA, requiring the packer to be set within the Schrader Bluff oil pool. The injection packer was instead set at 13096’ MD, which is 140’ MD above the top of the Schrader Bluff oil pool. This injection packer set depth also does not meet the requirements of 20 AAC 25.412(b), with the top sliding sleeve located at 13404’ MD, creating a reduced monitorable annulus. The 7” casing cement job on 11/27/2025 went to plan with the plug bumped and floats holding at the end of the job. On 11/30/2025, the 7” casing passed a pressure test to 3592 psi prior to drilling out the shoe and then a FIT test on the 7” casing shoe was performed at 12.18 ppg EMW. An RCBL was logged on 12/9/2025 and showed the 7” TOC at 10130’ MD. A rig MIT-IA passed to 3624 psi on 12/11/2025, after the injection packer was set, proving competent primary and secondary well barriers. Hilcorp plans to monitor injection isolation to the Schrader Bluff oil pool by conducting 2- year WFL stations across the 7” casing interval from the 7” shoe at 13352’ MD to above the injection packer at 13096’ MD. Hilcorp North Slope, LLC has determined that well L-291 is safe to operate in its current condition and requests approval for PWI based on the following: x Passing pressure tests of the primary and secondary barriers. x IA and OA pressures will be monitored with wireless pressure gauges. x Verification of continued injection isolation to the approved interval with 2-year WFL and MIT-IA. Proposed Operating and Monitoring Plan: 1. Hilcorp shall record wellhead pressures and injection rate daily; 2. Hilcorp shall submit to the AOGCC a monthly report of well pressures, injection rates, and pressure bleeds for all annuli. Bleeds to be flagged on the report; 3. Hilcorp shall perform a MIT-IA every two years to the greater of the maximum anticipated injection pressure or 0.25 x packer TVD, but not less than 1,500 psi; 4. Hilcorp shall perform an initial waterflow log and a subsequent log every two years with stations from 13000-13352’ MD; By Samantha Coldiron at 4:17 pm, Dec 16, 2025 5. Hilcorp shall limit the well’s inner annulus operating pressure to 2,100 psi. Audible control room alarms shall be set at or below these limits; 6. Hilcorp shall limit the well’s outer annulus operating pressure to 1,000 psi. Audible control room alarms shall be set at or below these limits; 7. Hilcorp shall monitor the inner and outer annulus pressures in real time with its SCADA system; 8. Hilcorp shall immediately shut in the well and notify the AOGCC if there is any change in the well's mechanical condition; 9. After well shut in due to a change in the well's mechanical condition, AOGCC approval shall be required to restart injection. If you have any questions, please call me at 406-570-9630 or Oliver Sternicki at 907-564-4891. Sincerely, Torin Roschinger PBW Operations Manager Attachments: Wellbore Schematic L-291 Schrader Bluff Formation Top Log Digitally signed by Torin Roschinger (4662) DN: cn=Torin Roschinger (4662) Date: 2025.12.16 05:18:54 - 09'00' Torin Roschinger (4662) Wellbore Schematic L-291 Schrader Bluff Formation Top Log 2 Notice of Public Hearing STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION RE: Docket Numbers: AIO 23-007 and CO 23-006 By application dated April 18, 2023, Hilcorp North Slope, LLC (Hilcorp) requests that the Alaska Oil and Gas Conservation Commission (AOGCC) expand the map extend of the Schrader Bluff Oil Pool (SBOP) in the Prudhoe Bay Unit. Conservation Order No. 505B defines the SBOP and prescribes rules for its development. Area Injection Order No. 26B prescribes rules for the injection of fluids into the SBOP for the purpose of enhanced oil recovery. Hilcorp proposes to amend these orders to expand the map extent of the SBOP to include acreage that recent drilling appears to confirm should be part of the pool to allow the new acreage to be developed under the same rules as the existing SBOP. This notice does not contain all the information filed by Hilcorp. To obtain more information, contact the AOGCC’s Special Assistant, Samantha Carlisle, at (907) 793-1223 or samantha.carlisle@alaska.gov. A public hearing on the matter has been tentatively scheduled for June 13, 2023, at 10:00 a.m. The hearing, which may be changed to full virtual, if necessary, will be held in the AOGCC hearing room located at 333 West 7th Avenue, Anchorage, AK 99501. The audio call-in information is (907) 202-7104 Conference ID: 431 265 009#. Anyone who wishes to participate remotely using MS Teams video conference should contact Ms. Carlisle at least two business days before the scheduled public hearing to request an invitation for the MS Teams. To request that the tentatively scheduled hearing be held, a written request must be filed with the AOGCC no later than 4:30 p.m. on May 10, 2023. If a request for a hearing is not timely filed, the AOGCC may issue an order without a hearing. To learn if the AOGCC will hold the hearing, call (907) 793-1223 after May 11, 2023. In addition, written comments regarding this application may be submitted to the AOGCC, at 333 west 7th Avenue, Anchorage, AK 99501 or samantha.carlisle@alaska.gov. Comments must be received no later than 4:30 p.m. on June 2, 2023, except that, if a hearing is held, comments must be received no later than the conclusion of the June 13, 2023, hearing. If, because of a disability, special accommodations may be needed to comment or attend the hearing, contact Samantha Carlisle, at (907) 793-1223, no later than June 8, 2023. Brett W. Huber, Sr. Chair, Commissioner Brett W. Huber, Sr. Digitally signed by Brett W. Huber, Sr. Date: 2023.04.20 14:36:50 -08'00' From:Carlisle, Samantha J (OGC) To:AOGCC_Public_Notices Subject:[AOGCC_Public_Notices] AIO-23-007 and CO-23-006 public hearing notice expansion of SBOP in PBU Date:Thursday, April 20, 2023 3:13:51 PM Attachments:AIO-23-007 and CO-23-006 public hearing notice expansion of SBOP in PBU.pdf By application dated April 18, 2023, Hilcorp North Slope, LLC (Hilcorp) requests that the Alaska Oil and Gas Conservation Commission (AOGCC) expand the map extend of the Schrader Bluff Oil Pool (SBOP) in the Prudhoe Bay Unit. Samantha Carlisle Special Assistant Alaska Oil and Gas Conservation Commission 333 West 7th Avenue Anchorage, AK 99501 (907) 793-1223 __________________________________ List Name: AOGCC_Public_Notices@list.state.ak.us You subscribed as: samantha.carlisle@alaska.gov Unsubscribe at: https://list.state.ak.us/mailman/options/aogcc_public_notices/samantha.carlisle%40alaska.gov Bernie Karl K&K Recycling Inc. P.O. Box 58055 Fairbanks, AK 99711 Adam Garrigus being first duly sworn on oath deposes and says that she is a representative of the Anchorage Daily News, a daily newspaper. That said newspaper has been approved by the Third Judicial Court, Anchorage, Alaska, and it now and has been published in the English language continually as a daily newspaper in Anchorage, Alaska, and it is now and during all said time was printed in an office maintained at the aforesaid place of publication of said news- paper. That the annexed is a copy of an adver- tisement as it was published in regular issues (and not in supplemental form) of said news- paper on AFFIDAVIT OF PUBLICATION ______________________________________ Notary Public in and for The State of Alaska. Third Division Anchorage, Alaska MY COMMISSION EXPIRES ______________________________________ 04/23/2023 and that such newspaper was regularly distrib- uted to its subscribers during all of said period. That the full amount of the fee charged for the foregoing publication is not in excess of the rate charged private individuals. Signed________________________________ Subscribed and sworn to before me this 24th day of April 2023. Account #: 100869 ST OF AK/AK OIL AND GAS CONSERVATION COMMISSION333 W. 7TH AVE STE 100, ANCHORAGE, AK 99501 Order #: W0037672 Cost: $305.8 Notice of Public HearingSTATE OF ALASKAALASKA OIL AND GAS CONSERVATION COMMISSION RE: Docket Numbers: AIO 23-007 and CO 23-006 By application dated April 18, 2023, Hilcorp North Slope, LLC (Hilcorp) requests that the Alaska Oil and Gas Conservation Commission (AOGCC) expand the map extend of the Schrader Bluff Oil Pool (SBOP) in the Prudhoe Bay Unit. Conservation Order No. 505B defines the SBOP and prescribes rules for its development. Area Injection Order No. 26B prescribes rules for the injection of fluids into the SBOP for the purpose of enhanced oil recovery. Hilcorp proposes to amend these orders to expand the map extent of the SBOP to include acreage that recent drilling appears to confirm should be part of the pool to allow the new acreage to be developed under the same rules as the existing SBOP. This notice does not contain all the information filed by Hilcorp. To obtain more information, contact the AOGCC’s Special Assistant, Samantha Carlisle, at (907) 793-1223 or samantha.carlisle@alaska.gov. A public hearing on the matter has been tentatively scheduled for June 13, 2023, at 10:00 a.m. The hearing, which may be changed to full virtual, if necessary, will be held in the AOGCC hearing room located at 333 West 7th Avenue, Anchorage, AK 99501. The audio call-in information is (907) 202-7104 Conference ID: 431 265 009#. Anyone who wishes to participate remotely using MS Teams video conference should contact Ms. Carlisle at least two business days before the scheduled public hearing to request an invitation for the MS Teams. To request that the tentatively scheduled hearing be held, a written request must be filed with the AOGCC no later than 4:30 p.m. on May 10, 2023. If a request for a hearing is not timely filed, the AOGCC may issue an order without a hearing. To learn if the AOGCC will hold the hearing, call (907) 793-1223 after May 11, 2023. In addition, written comments regarding this application may be submitted to the AOGCC, at 333 west 7th Avenue, Anchorage, AK 99501 or samantha.carlisle@alaska.gov. Comments must be received no later than 4:30 p.m. on June 2, 2023, except that, if a hearing is held, comments must be received no later than the conclusion of the June 13, 2023, hearing. If, because of a disability, special accommodations may be needed to comment or attend the hearing, contact Samantha Carlisle, at (907) 793-1223, no later than June 8, 2023. Brett W. Huber, Sr. Chair, Commissioner Pub: Apr. 23, 2023 STATE OF ALASKA THIRD JUDICIAL DISTRICT 2024-07-14 Document Ref: F5LNB-ETRGJ-ZONFW-RMHSZ Page 8 of 39 1 North Slope, LLC Kyndall Carey Land Tech 3800 Centerpoint Drive Suite 1400 Anchorage, AK 99503 Phone: 907/777-8386 Fax: 907/777-8301 kyndall.carey@hilcorp.com April 18, 2023 Brett Huber, Sr., Chair Alaska Oil and Gas Conservation Commission 333 West 7th Avenue Anchorage, AK 99501 RE: Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool Dear Chair Huber: Hilcorp North Slope, LLC (“Hilcorp North Slope”), as the operator of the Prudhoe Bay Unit (“PBU”), requests Alaska Oil and Gas Conservation Commission (“AOGCC”) approval to expand the Prudhoe Bay Schrader Bluff Oil Pool (“PBSBOP”) under Conservation Order (“CO”) 505B, and Area Injection Order (“AIO”) 26B. Hilcorp North Slope submits that the requested expansions will not promote waste, cause damage, or jeopardize correlative rights. These changes are proposed based on sound engineering and geoscience principles and will not result in fluid movement outside of the authorized injection zones. Enclosed in this application is supporting information. If you need additional information, please contact Kevin Eastham at 907/777-8316. Sincerely, Kyndall Carey Land Tech Hilcorp North Slope, LLC cc: ConocoPhillips Alaska, Inc. ExxonMobil Alaska Production Inc. Chevron U.S.A. Inc. By Samantha Carlisle at 1:56 pm, Apr 18, 2023 Digitally signed by Kyndall Carey (3936) DN: cn=Kyndall Carey (3936), ou=Users Date: 2023.04.18 13:36:27 -08'00' Kyndall Carey (3936) Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 2 Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool Outline 1. Introduction 2. Prudhoe Bay Schrader Bluff Oil Pool CO and AIO History 3. Proposed Prudhoe Bay Schrader Bluff Oil Pool Affected Area Expansion 4. Development Drilling Plans List of Figures 1. Schrader Bluff Pool Type Log 2. Location Map. Proposed Expansion of CO 505B 3. Location Map. Proposed Expansion of AIO 26B 4. Figure 4a and 4b: a. Confidential: Schrader Bluff OBd Sand, Depth Structure Map b. Schrader Bluff OBd Sand Map with proposed well locations 5. Confidential: Well Log Cross Section A-A’ 6. Confidential: Seismic Cross Section B-B’ Confidentiality Request 1. Figure 4a is an interpreted depth structure map of the Schrader Bluff OBd sand over the western portion of Prudhoe Bay unit. Hilcorp North Slope requests this be held confidential because it is interpreted data. 2. Figure 5 is a well log cross section including petrophysical interpretation of log data. Hilcorp North Slope requests this be held confidential because it is interpreted data. 3. Figure 6 is a seismic cross section running from NE to SW across the area. Hilcorp North Slope requests this be held confidential because it is interpreted data. 1. Introduction Hilcorp North Slope, LLC, as the operator of the Prudhoe Bay Unit, requests Alaska Oil and Gas Conservation Commission approval to expand the Prudhoe Bay Schrader Bluff Oil Pool (“PBSBOP”) under Conservation Order (“CO”) 505B, and Area Injection Order (“AIO”) 26B. This proposed expansion area extends the western boundary of the PBSBOP to match the Prudhoe Bay Unit boundary with the Kuparuk River Unit. The proposed expansion area also includes a small area north of Prudhoe Bay Unit (PBU) Z-Pad to reflect recent drilling results (portions of Sections 5, 6, and 8 in T11N R12E). Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 3 2. Prudhoe Bay Schrader Bluff Oil Pool CO and AIO History CO 505B, issued May 2010, supersedes, and replaces CO 505 (dated January 2004) and CO 505A (dated April 2006) only insofar as CO 505B concerns the Schrader Bluff Oil Pool. The Schrader Bluff Oil Pool includes the accumulation of hydrocarbons common to and correlating with the interval between the measured depths of 4,549 feet and 5,106 feet in the PBU V-201 well (Figure 1). Underground injection of fluids as described in BP Exploration Alaska Inc.’s applications for Area Injection Orders AIO 26 and AIO 26A are permitted, subject to the conditions, limitations and requirements established in AIO 26B, dated February 2021, for the Schrader Bluff Oil Pool. Conservation Order History x CO 505B.001: In January 2016, the Commission authorized the Prudhoe Bay Unit (PBU) operator’s request to waive monthly production allocation reporting requirements for the Schrader Bluff Oil Pool and several others. x CO 505B.002: In May 2019, the Commission authorized an amendment to Rules 4 and 5 to conform the Schrader Bluff Oil Pool rules for consistency with the well testing requirements and pressure survey requirements in the PBU to improve efficiency of field management for the operator and compliance oversight of the Commission. x CO 505B.003: In October 2020, the Commission repealed and replaced Rule 11 amending normal operating limits for inner annulus pressure. x CO 505B.004: In September 2021, the Commission repealed and replaced Rule 1 amending well spacing requirements. Area Injection Order History x AIO 26B.001: In September 2012, the Commission modified the original order by repealing and replacing Rule 3 Authorized Fluids for EOR and pressure maintenance. x AIO 26B.002: In June 2013, the Commission modified 26B.001 by repealing and replacing Rule 3 Authorized Fluids for EOR and pressure maintenance. x AIO 26B.003: In August 2020, the Commission authorized the injection of polymers in well L-213 (PTD 206-053) at the PBU operator’s request, subject to conditions in the order. x AIO 26B.004: In January 2021, the Commission granted the PBU operator’s request to continue water injection in well L-221 (PTD 2080310), subject to conditions in the order. x Corrected AIO 26B: In February 2021, the Commission issued an errata notice. The notice notes that AIO 26A.002 eliminated the word “water” from Rule 6 of AIO 26A, however, when AIO 26B was issued, the word water was only removed from the title of the rule and not from the body of the rule itself. The Commission issued a corrected AIO 26B on February 3, 2021. Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 4 x AIO 26B.005: In June 2021, the Commission granted Hilcorp North Slope’s request to continue WAG injection in well V-218 (PTD 2070400), subject to conditions in the order. x AIO 26B.006: In May 2022, the Commission granted Hilcorp North Slope’s request to continue WAG injection in well V-221 (PTD 2050130), subject to conditions in the order. x AIO 26B.007: In August 2022, the Commission granted Hilcorp North Slope’s request to continue WAG injection in well V-213A (PTD 2220010), subject to conditions in the order. AIO 26B.0007 was originally issued on May 23, 2022 and was amended by the August 18, 2023 version. x AIO 26B.008: In January 2023, the Commission granted Hilcorp North Slope’s request to continue WAG injection in well Z-223 (PTD 2220800), subject to conditions in the order. Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 5 Figure 1. Prudhoe Bay Schrader Bluff Oil Pool Type Log, V-201. Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 6 3. Proposed Prudhoe Bay Schrader Bluff Oil Pool Affected Area Expansion Hilcorp North Slope proposes the area subject to the conservation order for the PBSBOP (CO 505B), and corresponding area injection order (AIO 26B) be expanded, so that these orders apply to the following: Prudhoe Bay Schrader Bluff Oil Pool Proposed Affected Area T12N-R10E ADL 25637 Sec 13, 24 T12N-R11E ADL 28238 Sec 25 (SW/4), 26, 35, 36 ADL 28239 Sec 27, 28, 33, 34 ADL 47446 Sec 17, 18, 19, 20 ADL 47447 Sec 16 (S/2, NW/4, S/2NE/4), 21, 22 ADL 47449 Sec 29, 30, 32 ADL 390067 Sec 14 (S/2S/2), 23, 24 (SW/4, SW/4NW/4) T11N-R11E ADL 28240 Sec 1, 2, 11, 12 ADL 28241 Sec 3, 4, 9, 10 ADL 28244 Sec 15 ADL 28245 Sec 13, 14, 24 (E/2NE/4) T11N-R12E ADL 28262 Sec 17, 18, 19 (N/2, SE/4, N/2SW/4), 20 ADL 28263 Sec 16 (SW/4, S/2NW/4), 21 (W/2, W/2SE/4) ADL 47450 Sec 5 (SW/4), 6 (S/2), 7, 8 ADL 47452 Sec 28 (W/2, W/2E/2) ADL 47453 Sec 29 (N/2, N/2SE/4) Figure 2 is a map showing the proposed changes to CO 505B Prudhoe Bay Schrader Bluff Oil Pool Affected Area. Figure 3 is a map showing the proposed changes to AIO 26B Prudhoe Bay Schrader Bluff Oil Pool Affected Area. Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 7 Figure 2. Location Map. Proposed expansion of CO 505B Prudhoe Bay Schrader Bluff Oil Pool Affected Area. Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 8 Figure 3. Location Map. Proposed expansion of AIO 26B Prudhoe Bay Schrader Bluff Oil Pool Affected Area. Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 9 4. Development Drilling Plans The expansion of the PBSBOP will mainly include extending the oil pool to the west to match the Prudhoe Bay unit boundary with Kuparuk River Unit. This expansion would allow for development of the Schrader Bluff reservoirs from the recently expanded L-Pad. Figures 4a and 4b contains a series of dashed blue and green lines that represent drilling opportunities in the proposed area of PBSBOP expansion. Dashed green lines represent proposed horizontal producers and dashed blue lines represent proposed horizontal injectors. Drilling opportunities due west of L-Pad include OBc and OBd sand targets based on oil shows seen in L-112, L-100, and NWE1-01 (see Figure 5). Figure 6 shows the seismic data in this area. Drilling opportunities south of L-Pad likewise will target the OBc and OBd sands based on oil shows observed in L-121. Future opportunities in shallower Schrader Bluff sands (OA through OBb sands) will be evaluated while drilling OBc and OBd sand targets in the proposed expansion areas. Minor expansion to the PBSBOP is also proposed due east of V- Pad and due north of Z-Pad (Figure 4b). Drilling opportunities in these areas follows up oil identified outside the current defined pool by successful delineation seen in V-227A (drilled in 2022) and W-241 (drilled in 2023). An expanded PBSBOP in these areas would allow us to target unswept oil with future injectors in all Schrader Bluff sands. Application for Expansion of the Prudhoe Bay Schrader Bluff Oil Pool April 18, 2023 11 Figure 4b. Schrader Bluff OBd Sand Map with proposed well locations.