Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAbout2022 Endicott Oil Pool
Hilcorp 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, 2023
Brett Huber Sr, 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,
2022 ANNUAL RESERVOIR REVIEW
Dear Commissioner Huber:
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 2022 calendar year. The Endicott Field
has been on production since October 1987.
A. Progress of Enhanced Recovery Project and Reservoir Management Summary
During 2022, 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 6,022 bopd and average daily gas injection was 312 mmscfpd.
During 2022, injected fluid was calculated to be 9,255 thousand-reservoir barrels (MRB) less than reservoir voidage.
At year end, the reservoir overall cumulative voidage replacement ratio was 0.84. The average reservoir pressure
varies between zones. The average of surveys run in 2022 was 4,187 psia.
Hilcorp became the official operator of the Endicott Field effective November 18, 2014. 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 continuing to evaluate options to reduce H2S production rates in
producers.
Page 2
As of 12/31/2022 Full year (1) As of Dec-22 (2)
Producers 59 44
Injectors 28 27
2022
Cumulative Start-
Up through
12/31/22
2,198,055 485,805,416
125,151,236 4,046,131,391
77,637,919 2,241,814,183
77,915,366 2,172,923,784
113,875,042 3,489,564,218
164,981,863 5,410,576,240
155,726,182 4,557,343,014
-9,255,681 -853,233,226
6,022
342,880
212,706
213,467
311,986
4,187 psia
NOTES:
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 31 2022
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 2022
Production
Oil, BOPD
Average of surveys obtained in 2022
Water, BWPD
Injection
Water, BWPD
Gas, MCFPD
AVERAGE RESERVOIR PRESSURE
Page 3
B. Voidage Balance by Month of Produced Fluid and Injected Fluids – 2022
C. Summary and Analysis of reservoir pressure surveys within the pool
The following key wells in the Endicott Pool were proposed in 2022:
2022 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
Static bottomhole pressures collected in 2022 are summarized and submitted quarterly on the form 10-412 form
below.
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-2022 222,562 7,669,218 7,440,657 15,332,437 15,332,437 5,261,187,238 7,060,850 7,440,817 14,501,667 14,501,667 4,416,118,499 -830,771 -830,771 -845,068,740
Feb-2022 195,149 6,869,867 6,449,155 13,514,171 28,846,609 5,274,701,410 6,329,685 6,447,313 12,776,998 27,278,664 4,428,895,496 -737,174 -1,567,944 -845,805,914
Mar-2022 219,240 7,859,467 7,532,003 15,610,710 44,457,319 5,290,312,120 7,236,349 7,544,236 14,780,585 42,059,250 4,443,676,081 -830,125 -2,398,069 -846,636,039
Apr-2022 221,545 7,651,476 7,028,340 14,901,361 59,358,680 5,305,213,481 7,048,986 7,033,905 14,082,891 56,142,140 4,457,758,972 -818,470 -3,216,539 -847,454,509
May-2022 233,512 7,492,343 6,940,578 14,666,433 74,025,113 5,319,879,914 6,956,132 6,962,051 13,918,183 70,060,323 4,471,677,155 -748,250 -3,964,789 -848,202,758
Jun-2022 175,518 5,970,009 5,607,150 11,752,676 85,777,789 5,331,632,590 5,461,092 5,652,616 11,113,708 81,174,032 4,482,790,863 -638,968 -4,603,757 -848,841,727
Jul-2022 153,085 4,771,702 4,357,130 9,281,916 95,059,705 5,340,914,506 4,366,074 4,390,520 8,756,594 89,930,626 4,491,547,458 -525,322 -5,129,079 -849,367,049
Aug-2022 235,862 7,137,129 6,104,662 13,477,652 108,537,358 5,354,392,159 6,546,740 6,140,918 12,687,658 102,618,284 4,504,235,115 -789,995 -5,919,074 -850,157,043
Sep-2022 198,531 6,435,478 5,456,746 12,090,755 120,628,112 5,366,482,913 5,913,913 5,513,670 11,427,583 114,045,867 4,515,662,698 -663,172 -6,582,246 -850,820,215
Oct-2022 238,447 7,535,810 6,740,256 14,514,513 135,142,626 5,380,997,427 6,915,545 6,771,997 13,687,542 127,733,408 4,529,350,240 -826,972 -7,409,217 -851,647,187
Nov-2022 229,271 7,525,195 6,873,623 14,628,089 149,770,715 5,395,625,516 6,952,996 6,891,186 13,844,182 141,577,591 4,543,194,423 -783,907 -8,193,124 -852,431,093
Dec-2022 223,816 7,619,289 7,107,619 14,950,724 164,721,439 5,410,576,240 7,022,454 7,126,137 14,148,591 155,726,182 4,557,343,014 -802,133 -8,995,257 -853,233,226
Produced Fluids Injected Fluids (Injection - Production)
Page 4
The following key wells in the Endicott Pool will have static bottomhole pressure measurements captured in 2023;
2023 Key Well Program
2-04 K1, K2M, S3A 1-11 Ivishak
2-28B K2B 2-56A Sag River - Eider
3-25B K2A, S3A
3-31 K1, K2A, K2B
Endicott Oil Pool Datum: -10,000 ssTVD
Eider Oil Pool Datum: -9,700 ssTVD
D. Summary and Analysis of Gas-Oil Contact or Gas Monitoring Surveillance Plan.
No gas monitoring logs were obtained in 2022. 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 2023, we will run at least one cased hole pulsed neutron log. The log 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
A production profile was obtained on producer 3-25B on 11/24/2022 showing the following production splits.
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
1-45 50029219910000 O 220100 K3B 9776' - 10,071'6/11/2022 7,896 SBHP 207 10,000 4,865 10,000 0.43 4,865
2-62 50029216480000 O 220100 K3C 9707' - 10140'6/16/2022 336 SBHP 205 10,000 4,069 10,000 0.04 4,069
1-25 50029217220100 O 220100 K1, K2A 9959 - 10029'6/22/2022 2,424 SBHP 181 7,800 3,738 10,000 0.06 3,870
2-60 50029223750000 O 220100 K3C 10015' - 10094'6/20/2022 192 SBHP 204 10,000 4,450 10,000 0.43 4,450
4-50 50029219400000 O 220100 K3A 9980' - 9998'6/21/2022 336 SBHP 213 10,000 4,582 10,000 0.43 4,582
1-47A 50029216250100 O 220100 K2A 10087' - 10203'6/20/2022 456 SBHP 181 9,000 3,738 10,000 0.10 3,834
4-14 50029218630100 O 220100 K3C 9957' - 10018'6/25/2022 72 SBHP 214 10,000 5,285 10,000 0.43 5,285
1-35 50029216720000 O 220100 K3A 9872' - 9924 6/26/2022 960 SBHP 205 10,000 3,495 10,000 0.43 3,495
3-11 50029218480000 O 220100 K2B, K3A 9777 - 9847'7/3/2022 216 SBHP 181 9,877 3,940 10,000 0.11 3,954
1-65 50029226270100 O 220100 K2B 9755' - 9998'6/26/2022 72 SBHP 198 10,000 3,843 10,000 0.44 3,843
1-21 50029220050000 WI 220100 K1, K2A 9918' - 10075'7/20/2022 34,224 SBHP 206 10,000 3,809 10,000 0.42 3,809
Endicott Field/Endicott Oil Pool -10000 .88
3. Unit or Lease Name: 4. Field and Pool: 5. Datum Reference:
March 28, 2023
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
Comments:
Gavin Dittman
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 knowledge.
Signature
Printed Name
Title
Date
Reservior Engineer
Page 5
G. Future Development Plans & Review of Annual Plan of Operations and Development
In 2022, Hilcorp increased unit production through well intervention projects and other optimization
opportunities. The ongoing field studies of the Duck Island Unit will identify additional well intervention and
production enhancement opportunities.
Projects completed during the 2022 calendar year:
4-32 (Prod) – Endicott Oil Pool – gas lift redesign
4-48 (WINJ) – Endicott Oil Pool – return to injection
3-25B (Prod) – Endicott Oil Pool – S3A3 addperf
2-62 (Prod) – Endicott Oil Pool – pulled plug, opening F1 and S3A4
3-07 (Prod) – Endicott Oil Pool – F1 addperf
2-44 (Prod) – Endicott Oil Pool – return to production
3-17B (Prod) – Endicott Oil Pool - RWO
1-45 (Prod) – Endicott Oil Pool – FV addperf
4-02 (Prod) – Endicott Oil Pool – FIV & FV addperf
3-11 (Prod) – Endicott Oil Pool – Water shutoff
3-21 (Prod) – Endicott Oil Pool -Water shutoff
3-11 (Prod) – Endicott Oil Pool - RWO
2-04 (Prod) – Endicott Oil Pool – S2A1 addperf
3-11 (Prod) – Endicott Oil Pool – surface twin
Projects planned for the 2023 calendar year:
In 2023, 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 2023 execution. No drilling activities are currently planned at Endicott within the 2022 calendar year.
Hilcorp will continue to progress the Duck Island Unit field studies. 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,
Gavin Dittman
Reservoir Engineer - Endicott
