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Home My WebLink About2023 Northstar 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, 2024 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 OIL POOL, STATE OF ALASKA, 2023 ANNUAL RESERVOIR REVIEW Dear Commissioner Huber: In accordance with Conservation Order No. 458A, Hilcorp Alaska, LLC (“Hilcorp”), as Operator, hereby submits for your review the following Annual Reservoir Review for the Northstar Field. This is the Annual Reservoir Review and corresponds to events during the 2023 calendar year. Note that the Northstar Field has been on production since November 2001. A. Progress of Enhanced Recovery Project and Reservoir Management Summary During 2023, 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 and injection statistics are summarized in Table 1. Average daily oil production from the Northstar Oil Pool was 4232 bopd and average daily gas injection was 395 mmscfpd. The reservoir voidage balance values reported do not include oil production or gas injection from outside the Northstar Oil Pool. The outside pool production includes satellite well NS-34A and Kuparuk zone production. Kuparuk gas injection is also excluded. During 2023, gas injection was calculated to be 7554 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 from surveys obtained in 2023 was 5124 psia. Hilcorp became the official Operator of the Northstar Field effective November 18, 2014. Page 2 As of 12/31/2023 Full year (1) As of Dec-23 (2) Producers 15 11 Injectors 5 4 2023 Cumulative Start- Up through 12/31/23 1,544,718 181,813,374 152,312,157 3,200,765,710 3,780,989 92,646,977 5,449,787 105,042,036 144,275,917 3,549,617,883 105,662 2,414,515 98,108 2,412,852 -7,554 -1,663 4,232 417,294 10,359 14,931 395,276 5,124 psiaAverage of surveys obtained in 2023 Water, BWPD Injection Water, BWPD Gas, MCFPD AVERAGE RESERVOIR PRESSURE DAILY AVERAGE RATE DATA 2023 Production Oil, BOPD Gas, MCF/D Gas (MCF) Balance (excludes satellite well NS-34A and Kup Production/Injection ) Cum Production (MRB) Cum Injection (MRB) Over/Under (MRB) Oil (BBL) Gas (MCF) Water (BBL) Injection Water (BBL) into NS10 & NS32 Disposal Well (1) Well count data reflects ONLY those wells which contributed to production/injection during the respective year (2) Active wells as of December 2023 PRODUCTION/INJECTION STATISTICS Production Table 1: NORTHSTAR FIELD 2023 OVERVIEW STATISTICAL SUMMARY WELL STATISTICS NOTES: Page 3 B. Voidage Balance by Month of Produced Fluid and Injected Fluids – 2023 C. Summary and Analysis of reservoir pressure surveys within the pool Static bottom hole pressures collected in 2023 are summarized below. D. Results and Analysis of Production and Injection log surveys, tracer surveys, observation well surveys and any other special monitoring No new Ivishak production profiles were obtained in 2023. E. Review of pool production allocation factors and issues over the prior year 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-2023 176 9,403 173 9,753 9,753 2,318,606 8,890 8,890 2,323,634 -863 -863 5,028 Feb-2023 156 8,491 153 8,800 18,552 2,327,405 7,971 16,861 2,331,605 -828 -1,691 4,200 Mar-2023 168 9,180 169 9,517 28,069 2,336,922 8,593 25,454 2,340,198 -924 -2,615 3,276 Apr-2023 160 9,159 175 9,494 37,563 2,346,416 8,584 34,038 2,348,782 -910 -3,525 2,366 May-2023 156 8,886 161 9,203 46,766 2,355,619 7,901 41,939 2,356,683 -1,301 -4,827 1,064 Jun-2023 140 8,489 176 8,805 55,570 2,364,423 7,623 49,562 2,364,306 -1,182 -6,008 -117 Jul-2023 143 8,611 205 8,959 64,529 2,373,382 7,689 57,251 2,371,995 -1,270 -7,279 -1,388 Aug-2023 123 6,227 151 6,501 71,030 2,379,883 6,037 63,288 2,378,032 -464 -7,743 -1,852 Sep-2023 131 7,882 167 8,179 79,210 2,388,063 7,778 71,066 2,385,810 -401 -8,144 -2,253 Oct-2023 133 8,157 167 8,457 87,667 2,396,520 8,903 79,969 2,394,713 445 -7,698 -1,807 Nov-2023 130 8,285 178 8,593 96,260 2,405,113 8,705 88,674 2,403,418 112 -7,586 -1,695 Dec-2023 142 9,103 156 9,402 105,662 2,414,515 9,434 98,108 2,412,852 32 -7,554 -1,663 2023 Totals 1,758 101,873 2,032 105,662 98,108 -7,554 Produced Fluids Injected Fluids Net Injection (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 7/15/2023 2448 SBHP 254 11000 5159 11100 0.09 5169 NS-19 50029231220000 O 590100 Ivishak 10954-11069 7/16/2023 3840 SBHP 252 10900 5049 11100 0.08 5065 NS-20 50029231180000 O 590100 Ivishak 10958-11040 7/18/2023 3816 SBHP 250 10983 5150 11100 0.09 5162 NS-09 50029230520000 O 590100 Ivishak 10932-11030 8/21/2023 120 SBHP 251 11056 5092 11100 0.08 5097 NS-15 50029230730000 O 590150 Kuparuk 8940-8994 7/15/2023 1680 SBHP 190 9000 3098 9000 - 3098 NS-23 50029231460000 O 590150 Kuparuk 8953 - 9009 4/26/2023 - SBHP 201 9000 2937 9000 0.33 2937 NS-11 50029233030000 O 590100 Ivishak 10988 - 11058 8/22/2023 144 SBHP 256 11000 5096 11100 0.07 5103 NS-12 50029230910000 O 590100 Ivishak 10996 - 11057 8/22/2023 144 SBHP 252 11000 5089 11100 0.10 5099 NS-24 50029231110000 O 590100 Ivishak 10826 - 11047 8/24/2023 76368 SBHP 251 11020 5166 11100 0.10 5174 NS-20 50029231180000 O 590150 Kuparuk 9012 - 9059 11/22/2023 - SBHP 196 9000 3385 9000 0.17 3385 NS-24 50029231110000 O 590100 Sag 10717 - 10757 7/18/2023 75480 SBHP 250 10900 5304 11100 0.47 5397 STATE OF ALASKA ALASKA OIL AND GAS CONSERVATION COMMISSION RESERVOIR PRESSURE REPORT 1. Operator: 2. Address: Printed Name Title Date Reservoir Engineer March 27, 2024Gavin 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 Theoretical production is calculated for each Northstar producing well on a daily basis. 2023 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 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). Page 5 F. & G. Future Development Plans & Review of Annual Plan of Operations and Development In 2023, Hilcorp continued to maintained unit production through optimization opportunities. The field study of the Northstar Unit continued. Well histories, production and injection data, material balance calculations, geological, and geophysical work were studied and updated as necessary. Projects completed during the 2023 calendar year:  NS-23 (Ivishak) – recomplete to the Kuparuk reservoir as a producer  NS-20 (Ivishak) - recomplete to the Kuparuk reservoir as a producer  NS-16A (Ivishak) - recomplete to the Kuparuk reservoir as a producer  NS-25 (Ivishak) – reperf  NS-24 (Ivishak) – remediate integrity issue and return to service as Ivishak gas injector (in progress)  NS-05 (Ivishak) – add perf Projects planned for the 2024 calendar year: In 2024, Hilcorp will pursue increased unit production through additional well intervention projects, any necessary infrastructure and facility repairs, and other optimization opportunities as they arise. No drilling activities are planned at Northstar within the 2024 calendar year. Hilcorp will continue update the full field study of the Northstar Unit. This may include re-mapping productive horizons, updating well histories, reviewing production and injection data, material balance calculations, and reviewing results of any recent well intervention projects. Sincerely, Gavin Dittman Reservoir Engineer - Northstar