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Home My WebLink About2023 Colville River Unit March 27, 2024 Alaska Oil and Gas Conservation Commission 333 West 7th Avenue, Suite 100 Anchorage, AK 99501 Attention: Commissioner Brett Huber RE: • 2023 Annual Reservoir Surveillance Report, Colville River Unit, Alpine Oil Pool • 2023 Reservoir Review Reports, Colville River Unit, Nanuq and Qannik Oil Pools • Form 10-412 for Alpine, Nanuq, and Qannik Oil Pools • Form 10-413 for Alpine, Nanuq, and Qannik Oil Pools • Form 10-428 for Alpine, Nanuq, and Qannik Oil Pools • 2023 Safety Valve System Test Results, Colville River Unit • 2023 Daily Production Allocation Factors Dear Commissioner Huber, ConocoPhillips Alaska, Inc., as operator and sole working interest owner of the Colville River Unit, submits the 2023 annual surveillance reports and forms in accordance with their respective conservation orders (CO), as follows: • Alpine Oil Pool CO 443D, Rule 8 • Nanuq Oil Pool CO 562, Rules 7(f) and 10 • Qannik Oil Pool CO 605A, Rules 6(f) and 9 Sincerely, Ian Ramshaw Manager Western North Slope Asset Development Ian Ramshaw WNS Asset Development Manager ConocoPhillips Alaska, Inc. PO Box 100360 Anchorage, Alaska 99510-0360 Phone: (907) 263-4464 2023 Annual Reservoir Surveillance Report, Colville River Unit: Alpine Oil Pool 2023 Reservoir Review Reports, Colville River Unit: Nanuq and Qannik Oil Pools Form 10-412 for Alpine, Nanuq, and Qannik Oil Pools Form 10-413 for Alpine, Nanuq, and Qannik Oil Pools Form 10-428 for Alpine, Nanuq, and Qannik Oil Pools Safety Valve System Testing Results for 2023 Daily Production Allocation Factors for 2023 March 27, 2024 2023 CRU Reservoir Surveillance Report Table of Contents Alpine Oil Pool Annual Reservoir Surveillance Report ...................................................................................... 1 Nanuq Oil Pool Annual Reservoir Review .............................................................................................................. 4 Qannik Oil Pool Annual Reservoir Review ............................................................................................................. 6 Attachment 1: Colville River Unit Map .................................................................................................................... 8 Attachment 2: Reservoir Pressures at Datum – Alpine Oil Pool .................................................................... 9 Attachment 2: Reservoir Pressures at Datum – Nanuq Oil Pool ................................................................ 10 Attachment 2: Reservoir Pressures at Datum – Qannik Oil Pool ................................................................ 11 Attachment 3: 10-412 Pressure Survey Results – Alpine Oil Pool ............................................................. 12 Attachment 3: 10-412 Pressure Survey Results – Nanuq Oil Pool............................................................. 16 Attachment 3: 10-412 Pressure Survey Results – Qannik Oil Pool ............................................................ 17 Attachment 4: 10-413 Report of Injection Project – Alpine Oil Pool ........................................................ 18 Attachment 4: 10-413 Report of Injection Project – Nanuq Oil Pool ....................................................... 19 Attachment 4: 10-413 Report of Injection Project – Qannik Oil Pool ...................................................... 20 Attachment 5: 10-428 Annual Reservoir Properties Report ......................................................................... 21 Attachment 6: Safety Valve System Test Results .............................................................................................. 22 Attachment 7: CRU Daily Production Allocation Factors 2023 ................................................................... 24 2023 CRU Reservoir Surveillance Report 1 Alpine Oil Pool Annual Reservoir Surveillance Report ConocoPhillips Alaska, Inc., (CPAI) as Operator and sole working interest owner of the Colville River Unit (CRU), submits this Alpine Oil Pool Annual Reservoir Surveillance Report as required for the Alpine Oil Pool Conservation Order 443D, Rule 8. The Alpine Oil Pool includes the Alpine, Nanuq Kuparuk, Fiord Kuparuk, Fiord Nechelik, and Fiord West Kuparuk Participating Areas (PAs). Attachment 1 illustrates the current Colville River Unit boundary, participating areas, and surface facility pad locations. A: Progress of Recovery Projects, Alpine Status Update A total of 200 active development wells have been drilled in the Alpine Oil Pool as of January 1, 2024: 154 in the Alpine PA (80 producers, 74 injectors), 13 in the Nanuq Kuparuk PA (6 producers, 7 injectors), 6 in the Fiord Kuparuk PA (3 producers, 3 injectors), 2 in Fiord West Kuparuk PA (1 injector and 1 producer), and 23 in the Fiord Nechelik PA (13 producers, 10 injectors). Two disposal wells were previously completed in an undefined pool in the Sadlerochit Group sediments below the Alpine Oil Pool, and a third disposal well was completed in November 2022. Reservoir management of the Alpine Oil Pool in 2024 will aim to maximize oil rate by: (1) targeting a pattern level injection/withdrawal ratio of one, (2) managing water alternating gas (WAG) injection to maximize recovery, (3) updating and ranking workover and peripheral development opportunities for optimum drilling rig utilization, and (4) identifying well stimulation candidates. WAG in this document refers to a water-alternating-gas flood using either a miscible or sub-miscible enriched gas. These activities are expected to partially offset existing field decline. The following is a summary of the Alpine Oil Pool status as of January 1, 2024. Alpine Oil Pool 2023 Metrics Daily Average Rate Cumulative Volume Oil Production 30.8 MBOPD 662.7 MMSTB Gas Production 74.8 MMSCFD 750.3 BSCF Water Production 47.4 MBWPD 287.5 MMSTB Gas Injection 99.5 MMSCFD 674.6 BSCF Water Injection 69.8 MBWPD 976.1 MMSTB 2023 CRU Reservoir Surveillance Report 2 B: Voidage Balance Alpine Oil Pool 2023 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 1.04 1.16 February 1.04 1.15 March 1.04 1.01 April 1.04 1.10 May 1.04 1.23 June 1.04 1.10 July 1.04 0.90 August 1.04 1.06 September 1.04 1.11 October 1.04 0.96 November 1.04 0.89 December 1.03 0.66 C: Analysis of Reservoir Pressure Surveys and Special Monitoring Surveys A reservoir pressure survey map is presented in Attachment 2. The 10-412 report of reservoir pressures is Attachment 3. The Alpine pool reservoirs are continuously managed to maintain pattern pressures required for stable production and optimum EOR performance. Eighty-two static pressure surveys were performed on Alpine pool wells in 2023. Downhole pressure gauges are installed in 15 Alpine pool production wells. The gauges provide information about flood response and demonstrate reservoir pressure during shut-in events. Reservoir pressures are also estimated from simulation models and from inflow performance analyses. Both approaches are calibrated with reservoir pressure measurements collected from static surveys. D: Results and Analysis of Production and Injection Log Surveys, Temperature, Tracer Surveys, Observation Well Surveys None of these surveys were performed for the Alpine Oil Pool in 2023. E: Future Development Plans Future development for 2024 in the Alpine Oil Pool may include additional wells at CD2, CD4, or CD5 depending on rig usage/optimization. 2023 CRU Reservoir Surveillance Report 3 Development plans continue to support a WAG flood primarily via line-drive horizontal well patterns and a small number of slant wells. Excellent voidage replacement continues, with the current voidage replacement ratio above 1.0. Additional rotary drilling and CTD targets will be further matured to compete for rig time and planning work will be carried out accordingly. F: Results of Safety Valve System Testing Results from safety valve system tests performed in 2023 are listed in Attachment 6. 2023 CRU Reservoir Surveillance Report 4 Nanuq Oil Pool Annual Reservoir Review ConocoPhillips Alaska, Inc., (CPAI) as Operator and sole working interest owner of the Colville River Unit (CRU), submits this Nanuq Oil Pool Annual Reservoir Review as required for the Nanuq Oil Pool Conservation Order 562, Rules 7(f) and 10. The Nanuq Oil Pool includes the Nanuq Nanuq Participating Area. A: Nanuq Oil Pool Reservoir Pressures at Datum Map Please see Attachment 2 for the 2023 reservoir pressures at datum map. B: Summary and Analysis of Reservoir Pressure Surveys Please see Attachment 3 for the 10-412 report of reservoir pressures. C: Estimates of Reservoir Pressure Reservoir pressure is estimated to be 2,750 psi at the datum of 6,150’ TVDSS. D: Results and Analysis of Production and Injection, Temperature, Tracer Surveys, Observation Well Surveys, and Special Monitoring Surveys None of these surveys were performed for the Nanuq Oil Pool in 2023. E: Estimates of Annual Production and Reservoir Voidage Balance The tables below summarize average daily injection and production rates, cumulative fluid volumes, and voidage balance as of January 1, 2024. Nanuq Oil Pool allocated production was based on 147 well tests in 2023. See Attachment 7 for a graph of the 2023 CRU allocation factors. Nanuq Oil Pool 2023 Metrics Daily Average Rate Cumulative Volume Oil Production 0.8 MBOPD 6.4 MMSTB Gas Production 1.9 MMSCFD 11.1 BSCF Water Production 0.0 MBWPD 0.5 MMSTB Gas Injection 1.5 MMSCFD 2.8 BSCF Water Injection 1.0 MBWPD 12.8 MMSTB 2023 CRU Reservoir Surveillance Report 5 Nanuq Oil Pool 2023 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 1.05 0.56 February 1.04 0.63 March 1.04 0.85 April 1.04 0.80 May 1.04 0.70 June 1.04 0.54 July 1.04 0.86 August 1.04 1.41 September 1.04 1.72 October 1.04 1.31 November 1.04 0.94 December 1.04 1.04 In 2023, enriched gas was injected into three injectors (CD4-214, CD4-291, CD4-289). F: Progress of Plans and Tests to Expand the Productive Limits of the Pool The Nanuq Oil Pool has been developed primarily from CD4 and includes nine wells in the Nanuq Nanuq PA (5 producers, 4 injectors). Additional rotary drilling and CTD targets will be further matured to compete for rig time and planning work will be carried out accordingly. G: Results of Safety Valve System Testing Results from safety valve system tests performed in 2023 are listed in Attachment 6. 2023 CRU Reservoir Surveillance Report 6 Qannik Oil Pool Annual Reservoir Review ConocoPhillips Alaska, Inc., (CPAI) as Operator and sole working interest owner of the Colville River Unit (CRU), submits this Qannik Oil Pool Annual Reservoir Review as required for the Qannik Oil Pool Conservation Order 605A, Rules 6(f) and 9. The Qannik Oil Pool includes the Qannik and Narwhal Participating Areas (PAs). A: Qannik Oil Pool Reservoir Pressure at Datum Map and Summary and Analysis of Reservoir Pressure Surveys Please see Attachment 2 for the 2023 reservoir pressures at datum map. Please see Attachment 3 for the report of reservoir pressures. B: Results and Analysis of Production and Injection Log Surveys, Tracer Surveys, Observation Well Surveys and Special Monitoring A production log survey was performed in Qannik producer CD4-499 to better understand the primary gas production zones along the horizontal wellbore. C: Reservoir Voidage Balance and Cumulative Status The tables below summarizes average daily injection and production rates, cumulative fluid volumes, and voidage balance as of January 1, 2024. Voidage replacement in the Qannik PA reservoir relies on water injection and gas cap expansion from the flanks. Data includes Narwhal PA production and injection. Narwhal PA activity specific to injectors is also reported in the ERIO6 Narwhal Pilot Injection Progress Report. Qannik Oil Pool 2023 Metrics Daily Average Rate Cumulative Volume Oil Production 2.6 MBOPD 10.6 MMSTB Gas Production 2.6 MMSCFD 8.8 BSCF Water Production 0.3 MBWPD 0.9 MMSTB Gas Injection 0.0 MMSCFD 0.0 BSCF Water Injection 1.6 MBWPD 12.9 MMSTB 2023 CRU Reservoir Surveillance Report 7 Qannik Oil Pool 2023 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 0.74 0.78 February 0.74 0.61 March 0.74 0.73 April 0.74 0.50 May 0.73 0.34 June 0.73 0.36 July 0.73 0.20 August 0.72 0.00 September 0.71 0.00 October 0.71 0.21 November 0.70 0.01 December 0.70 0.31 D: Review of Production Allocation Factors and Issues Well test and allocation review show a total of 226 well tests were used to allocate production from the Qannik Oil Pool in 2023. See Attachment 7 for a graph of the 2023 CRU allocation factors. E: Progress of Enhanced Recovery Projects The Qannik PA has been developed from ten wells (7 producers and 3 injectors). The ongoing recovery scheme involves waterflood from inboard injection wells supplemented with a natural gas cap expansion drive from the east. Waterflood response has been observed in the Qannik zone, and flood surveillance is ongoing as pressure maintenance and enhanced recovery continue. The Qannik PA was expanded in 2021 to include the CD4-499, which is a step out from existing development at CD2. Additional rotary and CTD sidetrack targets may be considered as rig optimization/utilization dictates. The Narwhal PA current development consists of four producers and four injectors, with potential rotary targets in 2024 or 2025. F. Reservoir Management Summary Cumulative water injection equates to approximately 5% of the hydrocarbon pore volume of the developed portion of the reservoir. As would be expected for an immature flood, water production remains low at roughly 8% of total liquid production. 2023 CRU Reservoir Surveillance Report 8 Attachment 1: Colville River Unit Map 2023 CRU Reservoir Surveillance Report 9 Attachment 2: Reservoir Pressures at Datum – Alpine Oil Pool 2023 CRU Reservoir Surveillance Report 10 Attachment 2: Reservoir Pressures at Datum – Nanuq Oil Pool 2023 CRU Reservoir Surveillance Report 11 Attachment 2: Reservoir Pressures at Datum – Qannik Oil Pool 2023 CRU Reservoir Surveillance Report 12 Attachment 3: 10-412 Pressure Survey Results – Alpine Oil Pool Mar-26-2024 2023 CRU Reservoir Surveillance Report 13 Attachment 3: 10-412 Pressure Survey Results – Alpine Oil Pool (Continued) Mar-26-2024 2023 CRU Reservoir Surveillance Report 14 Attachment 3: 10-412 Pressure Survey Results – Alpine Oil Pool (Continued) Mar-26-2024 2023 CRU Reservoir Surveillance Report 15 Attachment 3: 10-412 Pressure Survey Results – Alpine Oil Pool (Continued) Mar-26-2024 2023 CRU Reservoir Surveillance Report 16 Attachment 3: 10-412 Pressure Survey Results – Nanuq Oil Pool Mar-26-2024 2023 CRU Reservoir Surveillance Report 17 Attachment 3: 10-412 Pressure Survey Results – Qannik Oil Pool Mar-26-2024 2023 CRU Reservoir Surveillance Report 18 Attachment 4: 10-413 Report of Injection Project – Alpine Oil Pool Mar-26-2024 2023 CRU Reservoir Surveillance Report 19 Attachment 4: 10-413 Report of Injection Project – Nanuq Oil Pool Mar-26-2024 2023 CRU Reservoir Surveillance Report 20 Attachment 4: 10-413 Report of Injection Project – Qannik Oil Pool Mar-26-2024 2023 CRU Reservoir Surveillance Report 21 Attachment 5: 10-428 Annual Reservoir Properties Report Mar-26-2024 2023 CRU Reservoir Surveillance Report 22 Attachment 6: Safety Valve System Test Results 2023 CRU Reservoir Surveillance Report 23 Attachment 6: Safety Valve System Test Results (continued) 2023 CRU Reservoir Surveillance Report 24 Attachment 7: CRU Daily Production Allocation Factors 2023