Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAbout2021 Endicott Oil PoolHilcorp Alaska, LLC
Post Office Box 244027
Anchorage, AK 99524-4027
3800 Centerpoint Drive
Suite 1400
Anchorage, AK 99503
Phone: 907/777-8486
Joleen.oshiro@hilcorp.com
April 1st, 2022
Jeremy Price, Chair
Alaska Oil & Gas Conservation Commission
333 W. 7th Avenue, Suite 100
Anchorage, Alaska 99501-3539
RE: DUCK ISLAND UNIT, ENDICOTT FIELD, ENDICOTT OIL POOL, STATE OF ALASKA,
2010 ANNUAL RESERVOIR REVIEW
Dear Commissioner Price:
In accordance with Conservation Order No. 462, Hilcorp Alaska, LLC (“Hilcorp”), as Operator, hereby submits for
your review the following Annual Reservoir Review for the Endicott Field.
This is the Annual Reservoir Review and corresponds to events during the 2021 calendar year. The Endicott Field
has been on production since October 1987.
A.Progress of Enhanced Recovery Project and Reservoir Management Summary
During 2021, no new wells were drilled in the Duck Island Unit. Therefore the locations of all the wells in the
Northstar Unit have remained unchanged.
Production and injection statistics are summarized in Table 1. Average daily oil production from the Endicott Oil
Pool was 5,838 bopd and average daily gas injection was 324 mmscfpd.
During 2021, injected fluid was calculated to be 9,564 thousand-reservoir barrels (MRB) less than reservoir voidage.
At year end, the reservoir overall cumulative voidage replacement ratio was 0.93. The average reservoir pressure
varies between zones. The average of surveys run in 2021 was 4,179 psia.
Hilcorp became the official operator of the Endicott Field effective November 18, 2014. As a result, the historic
reservoir simulation model developed by the previous operator will no longer will be utilized in the enhanced
recovery or reservoir management. Hilcorp will continue to identify and improve waterflood pattern efficiency by
allocating existing water injection volumes and adding perforations in active injection wells. Hilcorp is currently
reviewing debottlenecking projects at Endicott to boost gas and water handling capacities. The field is planning on
implementing an expanded biocide treatment to reduce H2S rates in the producers. The focus for future
development will be more focused on the Sag Delta North area, followed by the Kekiktuk 1 (“K1”) interval.
Page 2
B.Voidage Balance by Month of Produced Fluid and Injected Fluids – 2021
As of 12/31/2021 Full year (1)As of Dec-21 (2)
Producers 58 58
Injectors 26 26
2021
Cumulative Start-
Up through
12/31/21
2,130,948 483,798,112
130,346,196 3,921,655,965
82,923,526 2,002,234,661
83,301,000 2,347,462,407
118,391,002 3,494,080,178
173,761,374 4,899,439,933
164,197,572 4,523,424,907
-9,563,802 -376,015,026
5,838
357,113
227,188
228,222
324,359
4,179 psia
NOTES:
Table 1: ENDICOTT FIELD 2021 OVERVIEW STATISTICAL SUMMARY
WELL STATISTICS
Water (BBL)
(1) Well count data reflects ONLY those wells which contributed to production/injection during the respective year
(2) Active wells as of December 2021
PRODUCTION/INJECTION STATISTICS
Production
Oil (BBL)
Gas (MCF)
Water (BBL)
Injection
Gas, MCF/D
Gas (MCF)
Balance
Cum Production (MRB)
Cum Injection (MRB)
Over/Under (MRB)
DAILY AVERAGE RATE DATA 2021
Production
Oil, BOPD
Average of surveys obtained in 2021
Water, BWPD
Injection
Water, BWPD
Gas, MCFPD
AVERAGE RESERVOIR PRESSURE
Page 3
C.Summary and Analysis of reservoir pressure surveys within the pool
The following key wells in the Endicott Pool were proposed in 2021:
2020 Key Well Program
1-09A K2A, K2B 2-70 K3B, K3C 4-14A K3B, K3C
1-17A K3A 3-01 K2A 4-18 K3C
1-25A K1 3-23A K2B 1-11 SDN - Ivishak
2-14 K3A, K2B 4-38 K2A, K2B 2-56A Sag River - Eider
Endicott Oil Pool & Ivishak Datum: -10,000 ssTVD
Eider Oil Pool Datum: -9,700 ssTVD
Static bottomhole pressures collected in 2021 are summarized and submitted quarterly on the form 10-412 form
below.
The following key wells in the Endicott Pool will have static bottomhole pressure measurements captured in 2021;
2021 Key Well Program
1-09A K2A, K2B 2-64 K3C 4-42 K3C
1-17A K3A 2-70 K3B, K3C 1-11 Ivishak
2-14 K3A 3-47 K3B, K3C 2-56A Sag River - Eider
2-22 K3A, K3B, K3C 4-38 K2A, K2B
Endicott Oil Pool Datum: -10,000 ssTVD
Eider Oil Pool Datum: -9,700 ssTVD
Month Oil, RB Free Gas, RB
Water,
MRB
Total
Voidage,
MRB
Year
Cum, MRB
Cum since
start-up, MRB
Formation
Gas, MRB
Water,
MRB
Total
Injection,
MRB
Year
Cum, MRB
Cum since
start-up, MRB
Net
Injection,
MRB
Year
Cum, MRB
Cum since
start-up,
MRB
Jan-2021 224,712 6,916,424 6,048,171 13,189,307 13,189,307 4,911,757,093 6,346,769 6,068,646 12,415,415 12,415,415 4,568,340,475 -773,893 -773,893 -343,416,618
Feb-2021 230,822 6,716,002 6,844,528 13,791,352 26,980,659 4,925,548,445 6,160,503 6,862,383 13,022,886 25,438,300 4,581,363,361 -768,466 -1,542,359 -344,185,084
Mar-2021 252,482 7,793,111 7,664,901 15,710,494 42,691,153 4,941,258,939 7,147,281 7,681,649 14,828,930 40,267,231 4,596,192,291 -881,564 -2,423,923 -345,066,648
Apr-2021 245,252 7,660,681 7,364,560 15,270,494 57,961,647 4,956,529,433 7,042,537 7,387,248 14,429,785 54,697,016 4,610,622,076 -840,708 -3,264,631 -345,907,357
May-2021 249,658 7,637,183 7,310,893 15,197,734 73,159,381 4,971,727,167 7,015,814 7,337,569 14,353,383 69,050,399 4,624,975,459 -844,351 -4,108,982 -346,751,708
Jun-2021 246,764 7,458,743 7,278,046 14,983,553 88,142,934 4,986,710,720 6,846,311 7,314,464 14,160,775 83,211,174 4,639,136,234 -822,778 -4,931,760 -347,574,486
Jul-2021 214,067 6,911,306 6,561,022 13,686,395 101,829,329 5,000,397,115 6,347,690 6,618,091 12,965,781 96,176,955 4,652,102,015 -720,614 -5,652,374 -348,295,100
Aug-2021 181,577 6,309,245 5,628,478 12,119,300 113,948,629 5,012,516,415 5,804,594 5,699,539 11,504,133 107,681,088 4,663,606,148 -615,167 -6,267,541 -348,910,267
Sep-2021 249,990 7,461,478 7,353,546 15,065,014 129,013,643 5,027,581,429 6,872,784 7,421,145 14,293,929 121,975,017 4,677,900,077 -771,086 -7,038,627 -349,681,352
Oct-2021 267,216 7,708,206 7,542,394 15,517,816 144,531,459 5,043,099,245 7,103,630 7,587,271 14,690,901 136,665,918 4,692,590,978 -826,915 -7,865,541 -350,508,267
Nov-2021 253,356 7,639,494 6,677,396 14,570,246 159,101,705 5,057,669,491 7,048,753 6,686,865 13,735,618 150,401,535 4,706,326,595 -834,628 -8,700,169 -351,342,895
Dec-2021 263,014 7,747,064 6,649,591 14,659,669 173,761,374 5,072,329,160 7,159,906 6,636,130 13,796,036 164,197,572 4,720,122,632 -863,633 -9,563,802 -352,206,528
2,878,911 87,958,937 82,923,526 173,761,374 80,896,572 83,301,000 164,197,572 -9,563,802
Produced Fluids Injected Fluids (Injection - Production)
Page 4
D.Summary and Analysis of Gas-Oil Contact or Gas Monitoring Surveillance Plan.
The following table summarizes the results of the logs run in 2021 for gas monitoring.
A field wide current GOC is not likely to be identified as the Kekiktuk sands have several subzones that are
vertically separated and have different permeability. In addition, faulting in the reservoir may lead to hydraulic
isolation or partial pressure communication within a sub zone.
E.The Following Year Gas-Oil Contact or Gas Monitoring Surveillance Plan.
In 2021, we will run at least one cased hole pulsed neutron logs. The logs will be used to monitor GOC and any
potential remaining oil zones following additional rig intervention/workover. Additional candidates may be
identified and logged to continue GOC surveillance of the Endicott Oil Pool.
F.Results and Analysis of Production and Injection log surveys, tracer surveys, observation well surveys and
any other special monitoring
No production profiles were run in the 2021 calendar year.
6. Oil Gravity:
22
8. Well Name and
Number:
9. API Number
50XXXXXXXXXXXX
NO DASHES
10. Type
See
Instructions
11. AOGCC
Pool Code
12. Zone 13. Perforated
Intervals Top -
Bottom TVDSS
14. Final Test
Date
15. Shut-In
Time, Hours
16. Press.
Surv. Type
(see
instructions
for codes)
17. B.H.
Temp.
18. Depth
Tool TVDSS
19. Final
Observed
Pressure at
Tool Depth
20. Datum
TVDSS (input)
21. Pressure
Gradient, psi/ft.
22. Pressure at
Datum (cal)psig
1-09A 500292174301 GI 220100 K2A*, K2B* 10,052'-10,167'7/26/2021 43,859 SBHP 209 10,000 3,860 10,000 0.08 3,860
1-11 500292210700 WI 220150 Ivishak 10,028'-10,114'7/30/2021 96,960 SBHP 195 10,000 3,642 10,000 0.46 3,642
1-17A 500292210000 O 220100 K3A*, K2B* 10,054'-10,240'7/27/2021 3,657 SBHP 211 10,000 3,657 10,000 0.34 3,657
2-14 500292163900 O 220100 K3A*, K2B*,
K2A*9,982'-10,213'7/27/2021 5,388 SBHP 201 10,000 3,828 10,000 0.15 3,828
2-56A 500292286301 O 220165 Sag River 9,434' - 9,506'7/30/2021 1,728 SBHP 189 9,500 1,438 9,700 0.10 1,455
2-22 500292193100 WI 220100 K3C*, K3B*,
K3A*9,865' - 10,333'8/18/2021 96 SBHP 176 10,000 3,790 10,000 0.11 3,790
2-64 500292205500 WI 220100 K3C*, K3B* 10,179-10,356 8/2/2021 120 SBHP 180 10,000 4,515 10,000 0.48 4,515
2-70 500292189900 WI 220100 K3C*, K3B*,
K3A*9,988'-10,321'7/28/2021 133,368 SBHP 196 10,000 4,083 10,000 0.46 4,083
3-47 500292156900 WI 220100 K3C*, K3B*,
K3A*9967' - 10,306'8/2/2021 30,600 SBHP 200 10,000 4,977 10,000 0.46 4,977
4-42 50029217310000 WI 220100 K3C*, K3B*,
K3A*10,007' - 10,284'8/3/2021 156 SBHP 200 9,542 4,845 10,000 0.44 5,047
4-38 500292248200 O 220100 K2A*9,913' - 9,935'8/1/2021 16,008 SBHP 213 9,800 3,832 10,000 0.10 3,852
Comments: *Kekiktuk
Joleen Oshiro
23. All tests reported herein were made in accordance with the applicable rules, regulations and instructions of the Alaska Oil and Gas Conservation Commission.
I hereby certify that the foregoing is true and correct to the best of my know ledge.
Signature
Printed Name
Title
Date
Operations Engineer
March 2, 2022
STATE OF ALASKA
ALASKA OIL AND GAS CONSERVATION COMMISSION
RESERVOIR PRESSURE REPORT
1. Operator:2. Address:
Hilcorp Alaska, LLC 3800 Centerpoint Dr Suite 1400, Anchorage AK 99503
7. Gas Gravity:
Duck Island Unit/Endicott Endicott Field/Endicott Oil Pool -10000 .88
3. Unit or Lease Name:4. Field and Pool:5. Datum Reference:
END 2021 GOC Monitoring Program
3-31 MPI Gas Saturation Log CCL/GR/Press/Temp/Sigma 12/13/2021
Data was inconclusive due to gas present
in the well during logging. Unable to hold
back the gas from flowing in the well.
Well was logged in fluid
Log Results NotesWell Location Log Type Log Description Date
Page 5
G. Future Development Plans & Review of Annual Plan of Operations and Development
In 2021, Hilcorp increased unit production through well intervention projects and other optimization
opportunities. The ongoing field study of the Duck Island Unit ongoing updates with additional well intervention
results. The re-mapping of horizons, analyzing production and injection data, and geophysical work is ongoing.
Some additional wellwork was initiated due to data provided by surveillance activities, summarized below.
Projects completed during the 2021 calendar year:
·SDI 3-25B (Prod) - Endicott Oil Pool – Kekiktuk K2A (Non-rig) – Perf Add (March 2021)
·MPI 2-60 (Prod) - Endicott Oil Pool – Kekiktuk K3A (Non-rig) – SC Excavation/Repair (May 2021)
·MPI 1-39A (Prod) - Endicott Oil Pool – Kekiktuk S3A3 (Non-rig) – Perf Add (June 2021)
·MPI 2-14 (Prod) - Endicott Oil Pool – Kekiktuk S3A3 (Non-rig) – Perf Add (August 2021)
·MPI 1-29 (Prod) - Endicott Oil Pool – Kekiktuk S3A3, K2A (Non-rig) – Add Perforations (Sept 2021)
·SDI 3-03 (Prod) - Endicott Oil Pool – Kekiktuk K2A (Non-rig) – RTP (Sept 2021)
·SDI 4-38 (Prod) - Endicott Oil Pool – Kekiktuk K2A (Non-rig) – Add Perforations (Sept 2021)
·MPI 1-65 (Prod) – Endicott Oil Pool – Kekiktuk S3A3 (Non-rig) – Add Perforations (Oct 2021)
·MPI 2-04 (Prod) – Endicott Oil Pool – Kekiktuk S3A3 (Non-rig) – Add Perforations (Oct 2021)
·MPI 2-28B (Prod) – Endicott Oil Pool – Kekiktuk K2A (Non-rig) – Water Shut Off (Oct 2021)
·SDI 3-21 (Prod) – Endicott Oil Pool – Kekiktuk K2A, K2B (Non-rig) – Water Shut Off (Oct 2021)
·SDI 4-10 (Prod) – Endicott Oil Pool – Kekiktuk S3A3 (Non-rig) – Add Perforations (Oct 2021)
·MPI 1-29 (Prod) - Endicott Oil Pool – Kekiktuk S3A3, K2A (Non-rig) – Water Shut Off (Oct 2021)
·SDI 3-29 (Prod) – Endicott Oil Pool – Kekiktuk K2A, K2B (Non-rig) – Water Shut Off (Oct 2021)
Projects planned for the 2022 calendar year:
In 2022, Hilcorp will pursue increased unit production through additional well intervention projects, any necessary
infrastructure and facility repairs, and other optimization opportunities as they arise.Slickline, e-line, coiled
tubing, and other rigless interventions and planned throughout the year. Workover operations may be planned
for 2022 execution.
No drilling activities are planned at Endicott within the 2021 calendar year.
·Add Perfs in existing production wells
o Add perf in bypassed pay in Endicott Oil Pool.
o Identify additional oil pay with gas saturation logging
·Perform WSO/GSO
o Identify excessive water or gas production with PPROF/RST logging
o Perform water/gas shut off using wireline/coil.
·Perform water/gas flood maintenance work
o Run several static BHP surveys or IPROF logs to identify unhealthy water flood patterns
·MPI & SDI – possible opportunities such as RWO(s), return long-term-shut-in-wells to service, downhole
integrity mitigations, producer-to-injector conversion(s), and injector-to-producer conversion(s) will be
evaluated and possibly executed.
·Facility Work:
o Replace two 4” turbine LACT meters with one 2” and one 3” Coriolis meter
o Upgrade SDI Low Flow test separator
o Island reinforcement
o Propane seal oil demister install
Page 6
o Inter Island Water line Pig Launcher replacement
o Two week turn around:
§TEG plate exchanger clean-out
§Main B turbine overhaul
§Vessel inspections (multiple)
§Pipe repairs
§Equipment maintenance and inspection
§Valve replacement and repair
Hilcorp will continue to progress the field study of the Duck Island Unit. This may include re-mapping potentially
productive horizons, updating well histories, reviewing all production and injection data, material balance
calculations, and reviewing results of recent well intervention projects.
Sincerely,
Anthony McConkey
Reservoir Engineer - Endicott
