Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAbout2022 Northstar-Kuparuk 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: NORTHSTAR UNIT, NORTHSTAR FIELD, NORTHSTAR KUPARUK OIL POOL, STATE OF ALASKA,
2022 ANNUAL RESERVOIR REVIEW
Dear Commissioner Huber:
In accordance with Conservation Order No. 739, Hilcorp Alaska, LLC (“Hilcorp”), as Operator, hereby submits for
your review the following Annual Reservoir Review for the Kuparuk Oil Pool in the Northstar Field.
This is the Annual Reservoir Review under Conservation Order No. 739 that corresponds to events during the 2022
calendar year. Note that the Northstar Field has been on production since November 2001, with the Kuparuk Oil
Pool beginning continuous production in November 2010.
A. Progress of Enhanced Recovery Project and Reservoir Management Summary
During 2022, no new wells were drilled or sidetracked in the Northstar Unit. Therefore the locations of all the wells
in the Northstar Unit have remained unchanged.
Production statistics are summarized in Table 1. Average daily oil production from the Kuparuk Oil Pool field was
2,009 bopd and average daily gas injection was 132 mmscfpd.
During 2022, the negative reservoir voidage was calculated at 1,853 thousand-reservoir barrels (MRB). Note that
lean gas re-injection began in wells NS-18 and NS-17 in January and October 2019 respectively. The average of
reservoir pressure for 2022 was 2,283 psia.
Page 2
As of 12/31/2022 Full year (1) As of Dec-22 (2)
Producers 4 4
Injectors 2 2
2022
Cumulative Start-
Up through
12/31/22
733,177 10,165,121
53,518,697 418,298,257
1,488,703 4,296,205
0 0
48,116,701 169,154,141
5,074,456 32,322,188
3,223,819 11,333,327
-1,850,637 -20,988,861
2,009
146,627
4,079
0
131,827
2,283 psia
(1) Well count data reflects ONLY those wells which contributed to production/injection during the respective year
Table 1: NORTHSTAR KUPARUK OIL POOL
2022 OVERVIEW STATISTICAL SUMMARY
WELL STATISTICS
NOTES:
Gas (MCF)
(2) Active wells as of December 2022
PRODUCTION/INJECTION STATISTICS
Production
Oil (BBL)
Gas (MCF)
Water (BBL)
Injection
Water (BBL)
Water, BWPD
Balance (excludes satellite well NS-34A and Ivishak Production )
Cum Production (MRB)
Cum Injection (MRB)
Over/Under (MRB)
DAILY AVERAGE RATE DATA 2022
Production
Oil, BOPD
Gas, MCF/D
Average of surveys obtained in 2022
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
Static bottom hole pressures collected in 2022 are summarized below. Please note this data includes Ivishak
reservoir pressure data.
The average Northstar Kuparuk A & C reservoir pressure for 2022 is 2,283 psig. These above pressures have been
included with the historical Kuparuk reservoir pressure data and are graphically represented in the next figure.
Month Oil, MRB
Free Gas,
MRB
Water,
MRB
Total
Voidage,
MRB
Year
Cum, MRB
Cum since
start-up,
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 0 315,283 125,868 441,151 441,151 27,686,054 186,531 186,531 8,296,039 -254,619 -254,619 -19,390,015
Feb-2022 0 258,192 115,033 373,225 814,375 28,059,279 167,702 354,233 8,463,741 -205,523 -460,142 -19,595,538
Mar-2022 0 315,132 122,433 437,565 1,251,941 28,496,844 236,058 590,292 8,699,800 -201,507 -661,649 -19,797,045
Apr-2022 0 339,937 123,893 463,830 1,715,770 28,960,674 251,527 841,818 8,951,326 -212,303 -873,952 -20,009,348
May-2022 0 315,579 127,230 442,809 2,158,579 29,403,483 258,361 1,100,179 9,209,687 -184,448 -1,058,400 -20,193,796
Jun-2022 0 285,849 121,886 407,735 2,566,315 29,811,218 259,497 1,359,676 9,469,184 -148,239 -1,206,639 -20,342,035
Jul-2022 0 292,682 128,106 420,788 2,987,103 30,232,006 263,985 1,623,661 9,733,169 -156,803 -1,363,442 -20,498,838
Aug-2022 0 235,817 105,745 341,562 3,328,664 30,573,568 251,038 1,874,699 9,984,207 -90,524 -1,453,966 -20,589,361
Sep-2022 0 308,730 129,063 437,792 3,766,457 31,011,361 332,858 2,207,557 10,317,065 -104,935 -1,558,900 -20,694,296
Oct-2022 0 321,554 134,635 456,190 4,222,646 31,467,550 345,135 2,552,691 10,662,199 -111,055 -1,669,955 -20,805,351
Nov-2022 0 305,912 129,822 435,734 4,658,381 31,903,284 340,624 2,893,316 11,002,824 -95,110 -1,765,065 -20,900,461
Dec-2022 0 291,086 127,817 418,904 5,077,284 32,322,188 330,503 3,223,819 11,333,327 -88,400 -1,853,465 -20,988,861
2022 Totals 0 3,585,753 1,491,532 5,077,284 3,223,819 -1,853,465
Produced Fluids Injected Fluids (Injection - Production)
6. Oil Gravity:
44 API/47 API
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)
NS-14A 50029230260100 O 590100 Ivishak 11091-11089 12/7/22 148 SBHP 255 11000 5357 11100 .31 5388
NS-06 50029230880000 O 590100 Ivishak 10901-11099 12/8/22 1568 SBHP 254 11000 5341 11100 .18 5359
NS-19 50029231220000 O 590100 Ivishak 10954-11069 12/8/22 32664 SBHP 255 10900 5357 11100 .31 5419
NS-20 50029231180000 O 590100 Ivishak 10958-11040 12/9/22 32040 SBHP 255 10900 5341 11100 .085 5358
NS-09 50029230520000 O 590100 Ivishak 10932-11030 12/11/22 80 SBHP 255 11000 5357 11100 0.34 5391
NS-16A 50029230960100 O 590100 Ivishak 11029-11091 12/11/22 85 SBHP 254 10300 5357 11100 0.2 5517
NS-34A 50029233010100 O 590100 Ivishak 11049-11091 12/12/22 85 SBHP 254 11100 5350 11100 0 5350
NS-23 50029231460000 GI 590100 Ivishak 11056-11321 12/12/22 71 Other 11100 .031 4596
NS-28 50029232480000 GI 590100 Ivishak 11108-11150 12/13/22 82 Other 11100 0.45 5404
NS-30 50029232930000 O 590100 Ivishak 10858-11021 12/15/22 97 SBHP 252 11000 5058 11100 0.27 5085
NS-15 50029230730000 O 590150 Kuparuk 8940-8994 12/15/22 93 SBHP 189 9000 2910 9000 0 2910
NS-13 50029230170000 O 590150 Kuparuk 8875-9000 8/11/22 165 SBHP 8492 2237 9000 .09 2283
NS-17 50029231130000 GI 590150 Kuparuk 8859-9079 12/9/22 96 Other 9000 0.45 3493
STATE OF ALASKA
ALASKA OIL AND GAS CONSERVATION COMMISSION
RESERVOIR PRESSURE REPORT
1. Operator: 2. Address:
Printed Name
Title
Date
Reservoir Engineer
March 23, 2023Gavin Dittman
Certified Digital
Signature
23. All tests reported herein were made in accordance w ith 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.
7. Gas Gravity:
Northstar Unit
Hilcorp Alaska, LLC 3800 Centerpoint Dr Suite 1400, Anchorage, AK 99503
Northstar Field/Northstar Oil Pool &
Hooligan (Kuparuk) Oil Pools -11,100' TVDss/-9000' TVDss 0.75
3. Unit or Lease Name: 4. Field and Pool: 5. Datum Reference:
Page 4
D. Results and Analysis of Production and Injection log surveys, tracer surveys, observation well
surveys and any other special monitoring
No new Kuparuk production profiles were obtained in 2022.
There was no other special monitoring for this reporting period.
E. Review of pool production allocation factors and issues over the prior year
Theoretical production is calculated for each Northstar producing well on a daily basis.
2022 Production Allocation Method
A well’s theoretical production is calculated using metered field volumes and hours on production as follows:
Gas Allocation
Gross Produced Gas = total return metered at test separator.
Net Produced Gas = Gross Produced Gas – Gaslift Gas.
Theoretical Produced Gas = all well tests Net Produced Gas prorated by the month.
(Proration calculation will include adjustments for shut in or downtime periods)
Field Gas Injection = metered prior to injection
Total Net Produced Gas = Field Gas Injection + Fuel Gas + Flare Gas + PPA Gas - Buy Gas
(Buy Gas = imported or Caribou Crossing acquired gas).
𝑇𝑜𝑡𝑎𝑙 𝑁𝑒𝑡 𝑃𝑟𝑜𝑑𝑢𝑐𝑒𝑑 𝐺𝑎𝑠
𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑃𝑟𝑜𝑑𝑢𝑐𝑒𝑑 𝐺𝑎𝑠= 𝐺𝑎𝑠 𝐴𝑙𝑙𝑜𝑐𝑎𝑡𝑖𝑜𝑛 𝐹𝑎𝑐𝑡𝑜𝑟
Gas Allocation Factor x Theoretical Produced Gas (individual well) = Allocated Gas (individual well).
Oil Allocation
Page 5
Actual Field Oil Production = oil volume metered by LACT (sold/delivered to Northstar crude oil pipeline)
(Adjusted for BS&W, temperature, and API gravity in accordance with API standards and BSEE regulations.)
Gross Produced Oil = total return metered at test separator.
Theoretical Well Oil Production = all well tests Gross Produced Oil prorated by the month.
(Proration calculation will include adjustments for shut in or downtime periods)
Theoretical Field Oil Production = Sum of Theoretical Well Oil Production
Field Natural Gas Liquid (NGL) Production = metered prior to commingling with oil
𝐴𝑐𝑡𝑢𝑎𝑙 𝐹𝑖𝑒𝑙𝑑 𝑂𝑖𝑙 𝑃𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑜𝑛+ 𝐹𝑖𝑒𝑙𝑑 𝑁𝐺𝐿 𝑃𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑜𝑛
𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝐹𝑖𝑒𝑙𝑑 𝑂𝑖𝑙 𝑃𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑜𝑛=𝑂𝑖𝑙 𝐴𝑙𝑙𝑜𝑐𝑎𝑡𝑖𝑜𝑛 𝐹𝑎𝑐𝑡𝑜𝑟
Oil Allocation Factor x Theoretical Well Oil Production = Allocated Oil Production (individual well).
Water Allocation
Actual Field Water Production = water volume metered prior to injection disposal
Net Field Water Production = Actual Field Water Production – Metered Grey Water
Gross Produced Water = total metered at test separator.
Theoretical Well Water Production = all well tests Gross Produced Water prorated by the month.
(Proration calculation will include adjustments for shut in or downtime periods)
Theoretical Field Water Production = Sum of Theoretical Well Water Production
𝑁𝑒𝑡 𝐹𝑖𝑒𝑙𝑑 𝑊𝑎𝑡𝑒𝑟 𝑃𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑜𝑛
𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝐹𝑖𝑒𝑙𝑑 𝑊𝑎𝑡𝑒𝑟 𝑃𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑜𝑛=𝑊𝑎𝑡𝑒𝑟 𝐴𝑙𝑙𝑜𝑐𝑎𝑡𝑖𝑜𝑛 𝐹𝑎𝑐𝑡𝑜𝑟
Water Allocation Factor x Theoretical Well Water Production = Allocated Water Production (individual well).
F. & G. Future Development Plans & Review of Annual Plan of Operations and Development
A full field study of the Northstar Kuparuk Reservoir will continue in 2023. Well histories, review of production
and injection data, material balance calculations, geological, and geophysical work will be reviewed.
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.
Two Kuparuk producer recompletes are planned in 2023, involving current Ivishak producer NS-16A and Ivishak
injector NS-23. To manage the additional Kuparuk offtake, existing Kuparuk producer NS-15 will be converted to
gas injection. Ivishak producer NS-14 will be converted to injection to replace gas injector NS-23 once it’s
converted to the Kuparuk. No drilling activities are planned at Northstar within the 2023 calendar year.
Hilcorp is continuing to update the reservoir model to analyze the economics and viability of PBU gas imports to
maintain pressure in the Kuparuk reservoir. Facility gas debottlenecking projects are currently being reviewed in
conjunction with the gas importation feasibility study.
Sincerely,
Gavin Dittman
Reservoir Engineer - Northstar
