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Home My WebLink About2022 Colville River Unit April 1, 2023 Alaska Oil and Gas Conservation Commission 333 West 7th Avenue, Suite 100 Anchorage, AK 99501 Attention: Commissioner Brett Huber RE: • 2022 Annual Reservoir Surveillance Report, Colville River Unit, Alpine Oil Pool • 2022 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 • 2022 Safety Valve System Test Results, Colville River Unit • 2022 Daily Production Allocation Factors Dear Commissioner Huber, ConocoPhillips Alaska Inc., as operator and sole working interest owner of the Colville River Unit, submits the 2022 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 605, 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 2022 Annual Reservoir Surveillance Report, Colville River Unit: Alpine Oil Pool 2022 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 2022 Daily Production Allocation Factors for 2022 April 1, 2023 2022 CRU Reservoir Surveillance Report Table of Contents Alpine Oil Pool Annual Reservoir Surveillance Report ……………………...……. 1 Nanuq Oil Pool Annual Reservoir Review …………….………………...….............. 3 Qannik Oil Pool Annual Reservoir Review …………………………………….......... 4 Attachment 1: Colville River Unit Map …………………………………….…..…...... 6 Attachment 2: Reservoir Pressure Maps at Datum ………...........................….… 7 Attachment 3: 10-412 Pressure Survey Results by Pool ……………….…..…… 10 Attachment 4: 10-413 Report of Injection Project by Pool …………….……...… 15 Attachment 5: 10-428 Annual Reservoir Properties Report………….…….….… 18 Attachment 6: Safety Valve System Test Results …………….…...…..…………. 19 Attachment 7: Daily Production Allocation Factors …………….…...…..………. 23 2022 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 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, 2023: 153 in the Alpine zone (80 producers, 73 injectors), 13 in the Nanuq Kuparuk zone (6 producers, 7 injectors), 6 in the Fiord Kuparuk zone (3 producers, 3 injectors), 1 injector in Fiord West Kuparuk, and 23 in the Fiord Nechelik zone (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 Nov. 2022. Reservoir management of the Alpine Oil Pool in 2023 will attempt to maximize oil rate by: (1) targeting a pattern level injection/withdrawal ratio of one, (2) managing miscible water alternating gas (MWAG) injection to maximize recovery, (3) updating and ranking workover and peripheral development opportunities for optimum drilling rig utilization, and (4) identifying well stimulation candidates. MWAG in this document refers to a water-alternating-gas flood using either a miscible gas 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, 2023. Alpine Oil Pool 2022 Metrics Daily Average Rate Cumulative Volume Oil Production 30.3 MBOPD 611.4 MMSTB Gas Production 66.3 MMSCFD 723.7 BSCF Water Production 37.2 MBWPD 270.5 MMSTB Gas Injection 120.1 MMSCFD 641.4 BSCF Water Injection 64.3 MBWPD 953.7 MMSTB 2022 CRU Reservoir Surveillance Report 2 B: Voidage Balance Alpine Oil Pool 2022 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 1.03 1.03 February 1.03 1.06 March 1.03 1.15 April 1.03 1.33 May 1.03 1.47 June 1.03 1.50 July 1.03 1.41 August 1.04 1.47 September 1.04 1.34 October 1.04 1.33 November 1.04 1.18 December 1.04 1.10 C: Results and Analysis of Production and Injection Log Surveys, Temperature, Tracer Surveys, Observation Well Surveys and Special Monitoring 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 at the level required for stable production and optimum EOR performance. Twenty-four static pressure surveys were performed on Alpine pool wells in 2022. Downhole pressure gauges are installed in 17 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 as well as from inflow performance analyses. Both approaches are calibrated with actual reservoir pressure measurements collected from static surveys. D: Future Development Plans Planned development for 2023 includes: • Additional wells at CD2, CD4, or CD5 depending on rig usage/optimization E: Progress of Plans and Tests to Expand the Productive Limits of the Pool We are currently drilling the second well in the Fiord West Kuparuk PA with potential to spud an additional horizontal well in 2023. Development plans continue to be an MWAG flood primarily via line-drive horizontal well patterns and a few slant wells. Excellent voidage replacement continues, with the current voidage replacement ratio above unity. F: Results of Safety Valve System Testing Results from safety valve system tests performed in 2022 are listed in Attachment 6. 2022 CRU Reservoir Surveillance Report 3 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. A: Nanuq Oil Pool Reservoir Pressure Map Please see Attachment 2 for the 2022 reservoir pressure 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 2,821 psi at the datum of 6,150’ subsea. D: Results and Analysis of Production and Injection Log Surveys, Temperature, Tracer Surveys, Observation Well Surveys and Special Monitoring None of these surveys were performed for the Nanuq zone in 2022. 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, 2023. Nanuq Oil Pool allocated production was based on 138 well tests in 2022. See Attachment 7 for a graph of the 2022 CRU allocation factors. Nanuq Oil Pool 2022 Metrics Daily Average Rate Cumulative Volume Oil Production 0.8 MBOPD 6.2 MMSTB Gas Production 2.4 MMSCFD 10.4 BSCF Water Production 0.0 MBWPD 0.5 MMSTB Gas Injection 0.3 MMSCFD 2.3 BSCF Water Injection 2.1 MBWPD 12.5 MMSTB Nanuq Oil Pool 2022 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 1.06 1.31 February 1.07 1.92 March 1.07 1.81 April 1.07 0.89 May 1.07 0.68 June 1.06 0.50 July 1.06 0.93 August 1.06 0.94 September 1.06 0.61 October 1.06 0.43 November 1.05 0.39 December 1.05 0.50 In 2022, enriched gas was injected into two injectors (CD4-214 and CD4-289). 2022 CRU Reservoir Surveillance Report 4 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 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 2022 are listed in Attachment 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 605, Rules 6(f) and 9. A: Qannik Oil Pool Reservoir Pressure Map Please see Attachment 2 for the 2022 reservoir pressure map. B: Summary and Analysis of Reservoir Pressure Surveys Please see Attachment 3 for the report of reservoir pressures. C: Estimates of Reservoir Pressure Average reservoir pressure in the Qannik Oil Pool is 1400 psi at the datum of 4000’ TVDSS. D: Results and Analysis of Production and Injection Log Surveys, Temperature, Tracer Surveys, Observation Well Surveys and Special Monitoring None of these surveys were performed for the Qannik zone in 2022. E: Reservoir Voidage Balance and Cumulative Status The tables below summarize average daily injection and production rates, cumulative fluid volumes, and voidage balance as of January 1, 2023. Voidage replacement in the Qannik reservoir relies on water injection and gas cap expansion from the flanks. Data includes Narwhal production and injection. Narwhal activity specific to injectors is also reported in the ERIO6 Narwhal Pilot Injection Progress Report. Qannik Oil Pool 2022 Metrics Daily Average Rate Cumulative Volume Oil Production 1.7 MBOPD 9.6 MMSTB Gas Production 1.9 MMSCFD 7.9 BSCF Water Production 0.1 MBWPD 0.9 MMSTB Gas Injection 0.0 MMSCFD 0.0 BSCF Water Injection 2.2 MBWPD 12.3 MMSTB 2022 CRU Reservoir Surveillance Report 5 Qannik Oil Pool 2022 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 0.75 1.63 February 0.75 1.02 March 0.75 0.56 April 0.75 0.00 May 0.75 0.00 June 0.75 1.50 July 0.75 1.05 August 0.75 0.30 September 0.75 0.53 October 0.74 0.53 November 0.74 0.54 December 0.74 0.38 F: Review of Production Allocation Factors and Issues Well test and allocation review show a total of 192 well tests were used to allocate production from the Qannik Oil Pool in 2022. See Attachment 7 for a graph of the 2022 CRU allocation factors. G: Progress of Enhanced Recovery Projects The Qannik Oil Pool consists of the Qannik and Narwhal PA’s. 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 improved 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 one producer and two injectors, with potential rotary targets in 2023 or 2024. H. 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 such an immature flood, water production remains low at roughly 8% of total liquid production for CD2 wells. 2022 CRU Reservoir Surveillance Report 6 Attachment 1: Colville River Unit Map 2022 CRU Reservoir Surveillance Report 7 Attachment 2: Reservoir Pressures at Datum – Alpine Oil Pool 2022 CRU Reservoir Surveillance Report 8 Attachment 2: Reservoir Pressures at Datum – Nanuq Oil Pool 2022 CRU Reservoir Surveillance Report 9 Attachment 2: Reservoir Pressures at Datum – Qannik Oil Pool 2022 CRU Reservoir Surveillance Report 10 Attachment 3: 10-412 Pressure Survey Results – Alpine Oil Pool 2022 CRU Reservoir Surveillance Report 11 Attachment 3: 10-412 Pressure Survey Results – Alpine Oil Pool (Continued) 2022 CRU Reservoir Surveillance Report 12 Attachment 3: 10-412 Pressure Survey Results – Nanuq Oil Pool 2022 CRU Reservoir Surveillance Report 13 Attachment 3: 10-412 Pressure Survey Results – Qannik Oil Pool 2022 CRU Reservoir Surveillance Report 14 Attachment 3: 10-412 Pressure Survey Results – Qannik Oil Pool (Continued) 2022 CRU Reservoir Surveillance Report 15 Attachment 4: 10-413 Report of Injection Project – Alpine Oil Pool 2022 CRU Reservoir Surveillance Report 16 Attachment 4: 10-413 Report of Injection Project – Nanuq Oil Pool 2022 CRU Reservoir Surveillance Report 17 Attachment 4: 10-413 Report of Injection Project – Qannik Oil Pool 2022 CRU Reservoir Surveillance Report 18 Attachment 5: 10-428 Annual Reservoir Properties Report 2022 CRU Reservoir Surveillance Report 19 Attachment 6: Safety Valve System Test Results 2022 CRU Reservoir Surveillance Report 20 Attachment 6: Safety Valve System Test Results (continued) 2022 CRU Reservoir Surveillance Report 21 Attachment 6: Safety Valve System Test Results (continued) 2022 CRU Reservoir Surveillance Report 22 Attachment 6: Safety Valve System Test Results (continued) 2022 CRU Reservoir Surveillance Report 23 Attachment 7: CRU Daily Production Allocation Factors 2022