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Home My WebLink About2020 Colville River UnitSteve Thatcher Asset Manager Western North Slope DevelopmentConocoPhillips ConocoPhillips Alaska,Inc. PO Box 100360 Anchorage,Alaska 99510-0360 Phone:(907)263-4464 April 1,2021 Alaska Oil and Gas Conservation Commission 333 West 7th Avenue,Suite 100 Anchorage,AK 99501 Attention:Commissioner Jeremy Price RE: 2020 Annual Reservoir Surveillance Report,Colville River Unit ,Alpine Oil Pool 2020 Reservoir Review Reports,Colville River Unit,Nanuq,Fiord and Qannik Oil Pools Form 10-412 for Alpine,Nanuq,Fiord and Qannik Oil Pools Form 10-413 for Alpine,Nanuq,Fiord and Qannik Oil Pools Form 10-428 for Alpine,Nanuq,Fiord,and Qannik Oil Pools 2020 Safety Valve System Test Results,Colville River Unit 2020 Daily Production Allocation Factors Dear Commissioner Price, ConocoPhillips Alaska Inc.,as operator and sole working interest owner of the Colville River Unit,submits the 2020 annual surveillance reports and forms in accordance with their respective conservation orders (CO),as follows: •Alpine Oil Pool CO 443C,Rule 8 •Nanuq Oil Pool CO 562,Rules 7 (f)and 10 •Fiord Oil Pool CO 569,Rules 6(f)and 9 •Qannik Oil Pool CO 605,Rules 6(f)and 9 Alpine Oil Pool and Fiord Oil Pool are reported separately for 2020 but starting in 2021 will be combined to reflect the new Alpine Pool area,amended CO 443D effective February 3,2021, that combined them into one pool. Inquiries regarding this report may be directed to Mr.Sam Johnstone (Sam.Johnstone@conocophillips.com.263-4617)at this office. Sincerely, Steve Thatcher Asset Manager Western North Slope Development 2020 Annual Reservoir Surveillance Report, Colville River Unit: Alpine Oil Pool 2020 Reservoir Review Reports, Colville River Unit: Nanuq, Fiord and Qannik Oil Pools Form 10-412 for Alpine, Nanuq, Fiord and Qannik Oil Pools Form 10-413 for Alpine, Nanuq, Fiord and Qannik Oil Pools Form 10-428 for Alpine, Nanuq, Fiord, and Qannik Oil Pools Safety Valve System Testing Results for 2020 Daily Production Allocation Factors for 2020 April 1, 2021 2019 CRU Reservoir Surveillance Report Table of Contents Alpine Oil Pool Annual Reservoir Surveillance Report ……………………...……. 1 Nanuq Oil Pool Annual Reservoir Review …………….………………...….............. 2 Fiord Oil Pool Annual Reservoir Review ………………………………..……........... 4 Qannik Oil Pool Annual Reservoir Review …………………………………….......... 5 Attachment 1: Colville River Unit Map …………………………………….…..…...... 8 Attachment 2: Reservoir Pressure Maps at Datum ………...........................….… 9 Attachment 3: 10-412 Pressure Survey Results by Pool ……………….…..…… 13 Attachment 4: 10-413 Report of Injection Project by Pool …………….……...… 19 Attachment 5: 10-428 Annual Reservoir Properties Report………….…….….… 23 Attachment 6: Safety Valve System Test Results …………….…...…..…………. 24 Attachment 7: Daily Production Allocation Factors …………….…...…..………. 30 2020 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 443C, Rule 8. The Alpine Oil Pool includes the Alpine Participating Area and the Nanuq Kuparuk Participating Area (PA). 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 170 development wells have been drilled in the Alpine Oil Pool as of January 1, 2021: 157 in the Alpine zone (83 producers, 72 injectors) and thirteen in the Nanuq Kuparuk zone (6 producers, 7 injectors). Two disposal wells are completed in an undefined pool in the Sadlerochit Group sediments below the Alpine Oil Pool. Reservoir management of the Alpine Oil Pool in 2021 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 gas-alternating-water 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, 2021. Alpine Oil Pool 2020 Metrics Daily Average Rate Cumulative Volume Oil Production 38.0 MBOPD 511.2 MMSTB Gas Production 50.5 MMSCFD 600.7 BSCF Water Production 28.3 MBWPD 188.4 MMSTB Gas Injection 31.3 MMSCFD 497.0 BSCF Water Injection 88.0 MBWPD 763.4 MMSTB 2020 CRU Reservoir Surveillance Report 2 B: Voidage Balance Alpine Oil Pool 2020 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 1.02 0.98 February 1.02 0.97 March 1.02 1.03 April 1.02 1.12 May 1.02 1.28 June 1.02 1.55 July 1.02 1.02 August 1.02 1.03 September 1.02 0.99 October 1.02 1.07 November 1.02 1.03 December 1.02 1.06 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 zone is continuously managed to maintain pattern pressures at the level required for stable production and optimum EOR performance. Twenty-eight static pressure surveys were performed on Alpine pool wells in 2020. Downhole pressure gauges are installed in twenty-five 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 the Alpine full field simulation model 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 2021 includes: • 3 Alpine Oil Pool rotary wells at CD5 • Additional wells at CD1, CD2, CD4, or CD5 depending on rig usage/optimization 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 2020 reservoir pressure map. B: Summary and Analysis of Reservoir Pressure Surveys Please see Attachment 3 for the 10-412 report of reservoir pressures. 2020 CRU Reservoir Surveillance Report 3 C: Estimates of Reservoir Pressure Reservoir pressure is estimated to be 2,560 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 2019. 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, 2021. Nanuq Oil Pool allocated production was based on 149 well tests in 2020. See Attachment 7 for a graph of the 2020 CRU allocation factors. Nanuq Oil Pool 2020 Metrics Daily Average Rate Cumulative Volume Oil Production 0.9 MBOPD 5.6 MMSTB Gas Production 1.9 MMSCFD 8.8 BSCF Water Production .02 MBWPD 0.5 MMSTB Gas Injection 1.0 MMSCFD 2.0 BSCF Water Injection 1.8 MBWPD 11.1 MMSTB Nanuq Oil Pool 2020 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 1.07 0.96 February 1.06 0.70 March 1.06 0.96 April 1.06 1.08 May 1.07 1.51 June 1.07 15.58 July 1.07 0.89 August 1.07 1.23 September 1.07 1.01 October 1.07 1.21 November 1.07 0.96 December 1.07 0.81 In 2020, enriched gas was injected into two injectors (CD4-291 and 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 PA (5 producers, 4 injectors). In 2020, CTD sidetracks were drilled from CD4-214 and CD4-215 to extend development to the North. 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 2020 are listed in Attachment 6. 2020 CRU Reservoir Surveillance Report 4 Fiord Oil Pool Annual Reservoir Review ConocoPhillips Alaska, Inc., (CPAI) as Operator and sole working interest owner of the Colville River Unit (CRU), submits this Fiord Oil Pool Annual Reservoir Review as required for the Fiord Oil Pool Conservation Order 569, Rules 6(f) and 9. The Fiord Oil Pool includes the Fiord Nechelik Participating Area and the Fiord Kuparuk Participating Area. A: Fiord Oil Pool Reservoir Pressure Map Please see Attachment 2 for the 2020 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 Average reservoir pressure in the Fiord Oil Pool is 3,500 psi at the datum of 6,850’ subsea. D: Results and Analysis of Production and Injection Log Surveys, Temperature, Tracer Surveys, Observation Well Surveys and Special Monitoring Functional downhole pressure gauges are installed in three Fiord production wells. The gauges provide information about flood response and demonstrate reservoir pressure during shut-in events. 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, 2021. Fiord Oil Pool allocated production was based on 615 well tests in 2020. See Attachment 7 for a graph of the 2020 CRU allocation factors. Fiord Oil Pool 2020 Metrics Daily Average Rate Cumulative Volume Oil Production 4.9 MBOPD 75.0 MMSTB Gas Production 9.3 MMSCFD 76.3 BSCF Water Production 10.0 MBWPD 48.2 MMSTB Gas Injection 15.9 MMSCFD 81.6 BSCF Water Injection 16.1 MBWPD 126.5 MMSTB 2020 CRU Reservoir Surveillance Report 5 Fiord Oil Pool 2020 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 1.07 1.58 February 1.07 1.42 March 1.07 0.98 April 1.07 0.91 May 1.07 1.34 June 1.07 2.16 July 1.07 1.12 August 1.07 1,01 September 1.07 0.86 October 1.07 1.39 November 1.07 1.41 December 1.07 1.45 F: Progress of Plans and Tests to Expand the Productive Limits of the Pool There are currently twenty-three active wells drilled in the Fiord Nechelik PA (13 producers, 10 injectors). The Fiord Kuparuk PA currently has six wells in it (3 producers, 3 injectors). The Fiord Pool plan of development includes four potential wells to be drilled in the 2021 - 2022 timeframe. These four wells include three horizontal wells (CD2-310 injector, CD2-361 producer, CD2-360 injector) and one slant pilot well (Titan). Development plans within both Fiord zones continues to be an MWAG flood primarily via line- drive horizontal well patterns and a few slant wells in the Fiord Kuparuk. Excellent voidage replacement continues in the Fiord zones, with the current voidage replacement ratio above unity. G: Results of Safety Valve System Testing Results from safety valve system tests performed in 2020 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 2020 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 1550 psi at the datum of subsea. 2020 CRU Reservoir Surveillance Report 6 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 2020. 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, 2021. Voidage replacement in the Qannik reservoir relies on water injection and gas cap expansion from the flanks. Voidage replacement was lower in 2020 due to one of the three injectors being shut-in for several months to manage pressure for Fiord West Kuparuk drilling; this injector (CD2-404) is planned to come back online in 2022. Qannik Oil Pool 2020 Metrics Daily Average Rate Cumulative Volume Oil Production 1.8 MBOPD 8.4 MMSTB Gas Production 3.2 MMSCFD 6.6 BSCF Water Production 0.2 MBWPD 0.7 MMSTB Gas Injection 0.0 MMSCFD 0.0 BSCF Water Injection 1.7 MBWPD 11.0 MMSTB Qannik Oil Pool 2020 Voidage Balance Month Cumulative Injection / Withdrawal Ratio RVB/RVB Injection / Withdrawal Rate RVB/RVB January 0.83 0.36 February 0.83 0.44 March 0.83 0.46 April 0.82 0.29 May 0.82 0.51 June 0.82 1.07 July 0.82 0.58 August 0.81 0.29 September 0.80 0.19 October 0.79 0.35 November 0.79 0.34 December 0.78 0.22 F: Review of Production Allocation Factors and Issues Well test and allocation review show a total of 257 well tests were used to allocate production from the Qannik Oil Pool in 2020. See Attachment 7 for a graph of the 2020 CRU allocation factors. G: Progress of Enhanced Recovery Projects The Qannik Oil Pool has been developed at CD2 from nine wells (6 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. A horizontal producer, CD4-499, was drilled in 2020 and represents a step-out from the 2020 CRU Reservoir Surveillance Report 7 existing development at CD2, away from existing well control. This well will help better characterize the eastern and southern portion of the reservoir. This well is currently under tract operations but will be included with the PA as part of the PA expansion occurring in 2021. Additional rotary and CTD sidetrack targets may be considered as rig optimization/utilization dictates. An updated development plan has been prepared to add laterals to existing producer and injector wells to reduce inter-well spacing, and hence increase throughput and accelerate production. In 2018, four CTD laterals were successfully drilled in the CD2-463 producer. Early production uplift has been in line with pre-drill estimates, thus the down-spacing plan will be further implemented pending rig availability and portfolio considerations. H. Reservoir Management Summary Cumulative water injection equates to approximately 15% 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. 2020 CRU Reservoir Surveillance Report 8 Attachment 1: Colville River Unit Map 2020 CRU Reservoir Surveillance Report 9 Attachment 2: Reservoir Pressures at Datum Alpine Oil Pool 2020 CRU Reservoir Surveillance Report 10 Attachment 2: Reservoir Pressures at Datum Nanuq Oil Pool 2020 CRU Reservoir Surveillance Report 11 Attachment 2: Reservoir Pressures at Datum Fiord Oil Pool 2020 CRU Reservoir Surveillance Report 12 Attachment 2: Reservoir Pressures at Datum Qannik Oil Pool 2020 CRU Reservoir Surveillance Report 13 Attachment 3: 10-412 Pressure Survey Results by Pool - ALPINE 2020 CRU Reservoir Surveillance Report 14 Attachment 3: 10-412 Pressure Survey Results by Pool - ALPINE 2020 CRU Reservoir Surveillance Report 15 Attachment 3: 10-412 Pressure Survey Results by Pool – NANUQ 2020 CRU Reservoir Surveillance Report 16 Attachment 3: 10-412 Pressure Survey Results by Pool – FIORD 2020 CRU Reservoir Surveillance Report 17 Attachment 3: 10-412 Pressure Survey Results by Pool – FIORD 2020 CRU Reservoir Surveillance Report 18 Attachment 3: 10-412 Pressure Survey Results by Pool – QANNIK 2020 CRU Reservoir Surveillance Report 19 Attachment 4: 10-413 Report of Injection Project by Pool - ALPINE 2020 CRU Reservoir Surveillance Report 20 Attachment 4: 10-413 Report of Injection Project by Pool - NANUQ 2020 CRU Reservoir Surveillance Report 21 Attachment 4: 10-413 Report of Injection Project by Pool - FIORD 2020 CRU Reservoir Surveillance Report 22 Attachment 4: 10-413 Report of Injection Project by Pool - QANNIK 2020 CRU Reservoir Surveillance Report 23 Attachment 5: Annual Reservoir Properties 2020 CRU Reservoir Surveillance Report 24 Attachment 6: Safety Valve System Test Results 2020 CRU Reservoir Surveillance Report 25 2020 CRU Reservoir Surveillance Report 26 2020 CRU Reservoir Surveillance Report 27 2020 CRU Reservoir Surveillance Report 28 2020 CRU Reservoir Surveillance Report 29 2020 CRU Reservoir Surveillance Report 30 Attachment 7: Colville River Unit Daily Production Allocation Factors - 2020