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Home My WebLink About2023 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, 2024 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, 2023 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 2023 calendar year. The Endicott Field has been on production since October 1987. A. Progress of Enhanced Recovery Project and Reservoir Management Summary During 2023, no new wells were drilled in the Duck Island Unit. Therefore the locations of all the wells in the Duck Island Unit have remained unchanged. Production and injection statistics are summarized in Table 1. Average daily oil production from the Endicott Oil Pool was 5110 bopd and average daily gas injection was 315 mmscfpd. During 2023, injected fluid was calculated to be 9493 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 2023 was 3800 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 12/31/2023 Full year (1) As of Dec-23 (2) Producers 51 41 Injectors 28 27 2023 Cumulative Start- Up through 12/31/23 1,865,161 487,670,577 126,859,574 4,172,990,965 81,446,264 2,323,260,447 81,748,246 2,254,672,030 114,794,962 3,604,359,180 169,680,650 5,580,256,890 160,187,644 4,717,530,658 -9,493,007 -862,726,233 5,110 347,560 223,140 223,968 314,507 3,800 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 Cum Production (MRB) Cum Injection (MRB) Over/Under (MRB) Oil (BBL) Gas (MCF) Water (BBL) Injection 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 2023 PRODUCTION/INJECTION STATISTICS Production Table 1: ENDICOTT 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 The following key wells in the Endicott Pool were proposed 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 Static bottomhole pressures collected in 2023 are summarized and submitted 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-2023 222,614 7,656,069 7,079,712 14,958,395 14,958,395 5,425,534,635 7,047,581 7,102,375 14,149,956 14,149,956 4,571,492,970 -808,439 -808,439 -854,041,665 Feb-2023 197,804 6,591,479 6,461,205 13,250,488 28,208,884 5,438,785,124 6,032,134 6,480,683 12,512,817 26,662,773 4,584,005,787 -737,671 -1,546,111 -854,779,337 Mar-2023 203,511 6,452,733 7,031,357 13,687,601 41,896,484 5,452,472,724 5,880,690 7,037,011 12,917,701 39,580,474 4,596,923,488 -769,900 -2,316,010 -855,549,236 Apr-2023 205,398 7,328,036 7,180,793 14,714,227 56,610,711 5,467,186,951 6,721,290 7,193,011 13,914,301 53,494,775 4,610,837,789 -799,926 -3,115,936 -856,349,162 May-2023 208,601 7,446,028 7,398,826 15,053,455 71,664,167 5,482,240,407 6,824,123 7,415,263 14,239,386 67,734,161 4,625,077,175 -814,069 -3,930,005 -857,163,231 Jun-2023 201,795 6,905,966 6,879,919 13,987,679 85,651,846 5,496,228,086 6,315,705 6,896,114 13,211,819 80,945,980 4,638,288,994 -775,860 -4,705,865 -857,939,091 Jul-2023 233,519 6,863,490 6,740,149 13,837,158 99,489,004 5,510,065,244 6,276,839 6,766,405 13,043,244 93,989,224 4,651,332,238 -793,914 -5,499,780 -858,733,006 Aug-2023 229,108 7,217,161 6,806,872 14,253,141 113,742,145 5,524,318,385 6,609,099 6,780,661 13,389,760 107,378,984 4,664,721,998 -863,381 -6,363,161 -859,596,387 Sep-2023 204,101 7,000,728 6,492,986 13,697,815 127,439,960 5,538,016,200 6,406,699 6,514,745 12,921,444 120,300,428 4,677,643,442 -776,371 -7,139,532 -860,372,758 Oct-2023 196,084 7,133,792 6,367,044 13,696,920 141,136,880 5,551,713,120 6,518,792 6,387,381 12,906,173 133,206,601 4,690,549,615 -790,747 -7,930,279 -861,163,505 Nov-2023 208,176 7,592,374 6,412,086 14,212,635 155,349,515 5,565,925,755 6,944,079 6,558,408 13,502,487 146,709,088 4,704,052,102 -710,148 -8,640,427 -861,873,653 Dec-2023 209,123 7,526,698 6,595,315 14,331,135 169,680,650 5,580,256,890 6,862,366 6,616,189 13,478,555 160,187,644 4,717,530,658 -852,580 -9,493,007 -862,726,233 Produced Fluids Injected Fluids (Injection - Production) 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 2-04 5008420001 O 220100 K1, K2A, K2M, K3A 9703 - 9709, 9933 - 9942, 10019 - 10043, 10059 - 10177 3/31/2023 120 SBHP 186 9,145 3,744 10,000 0.24 3,949 2-28B 5008420031 O 220100 K2B 9999 - 10003 3/30/2023 96 SBHP 199 9,440 3,539 10,000 0.42 3,774 3-25B 5008420055 O 220100 K2A, S3A 9767 - 9783, 10058 - 10063, 10127 - 10136, 10154 - 10166 3/29/2023 72 SBHP 208 10,000 3,576 10,000 0.37 3,756 2-56A 5008420076 O 220165 Sag River 11/30/2023 1,368 SBHP 187 9,500 1,303 9,700 0.31 1,365 5-03 5008420110 WI 220150 Ivishak 9915 - 9953, 9960 - 9967, 10020 - 10028, 10035 - 10061 11/30/2023 384 SBHP 78 10,000 5,601 10,000 0.35 5,601 2-38 5008420052 O 220150 Ivishak 9933 - 9957, 9982 - 9986, 9989 - 10068 11/20/2023 168 SBHP 208 10,000 4,132 10,000 0.39 4,132 2-36 5008420047 O 220100 K3A 10029 - 10038 3/31/2023 120 SBHP 187 8,785 3,255 10,000 0.44 3,794 3-31 5008420075 O 220100 K1, K2A, K2B 9789 - 9899, 9813 - 9826, 9854 - 9862 , 9866 - 9878, 10074 - 10094, 10105 - 10125, 10132 - 10138, 10179 - 10195 3/30/2023 96 SBHP 214 9,945 3,709 1,000 0.35 3,728 Endicott Field/Endicott Oil Pool -10000 .88 3. Unit or Lease Name: 4. Field and Pool: 5. Datum Reference: March 25, 2024 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 4 The following key wells in the Endicott Pool will have static bottomhole pressure measurements captured in 2024; 2023 Key Well Program 2-62 S3A, F1, F3 2-38 Ivishak 1-19 K2B 2-56A Sag River - Eider 1-33B K2A 2-18 S3A, F1 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. Two cased hole pulsed neutron logs were acquired in 2023, in producers 1-27 and 2-20. Gas was observed as deep as 10147’ TVDss in 1-27, reaching the base of the upper K2A. A more pronounced GOC was observed at 10058’ TVDss at the base of the K2B. 2-20 showed a prominent GOC at 9726’ TVDss above the F6 interval, with additional gas saturated intervals observed as deep as 9905’ TVDss, corresponding to the F4 interval. 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 2024, 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 2-04 on 06/11/2023 which showed the bulk of the hydrocarbons coming from the K2M interval. G. Future Development Plans & Review of Annual Plan of Operations and Development In 2023, 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 2023 calendar year:  3-47 (WINJ) – Endicott Oil Pool - Schmoo B Gone treatment of tubing  3-49 (WINJ) – Endicott Oil Pool - Schmoo B Gone treatment of tubing  2-04 (Prod) – Endicott Oil Pool - Water Shut off  2-34 (WINJ) – Endicott Oil Pool - K2A Add Perforation  1-01 (Prod) – Endicott Oil Pool - Plug and Perf Flow Under eval  1-01 (Prod) – Endicott Oil Pool - RWO Tubing Swap Page 5  1-27 (Prod) – Endicott Oil Pool - PNL and Add Perforation (multiple intervals)  2-16 (Prod) – Endicott Oil Pool - F2 Add Perforation  2-06 (GINJ) – Endicott Oil Pool - reperf perfs  1-69 (WINJ) – Endicott Oil Pool - Add perforation  1-29 (Prod) – Endicott Oil Pool - Add perforation  4-10 (Prod) – Endicott Oil Pool - Fishing and Plug Mill  2-68 (Prod) – Endicott Oil Pool - Pull and reset patch for well integrity 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. Slickline, e-line, coiled tubing, and other rigless interventions and planned throughout the year. Workover operations may be planned for 2024 execution. Two drill wells are planned at Endicott within the 2024 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