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Home My WebLink About2013 Eider Oil PoolZE Katrina Garner Manager, Base Management BP Exploration Alaska April 02, 2014 Cathy Foerster Commissioner and Chair Alaska Oil and Gas Conservation Commission 333 W. 7th Ave #100 Anchorage, Alaska, 99501-3539 BP Exploration (Alaska) Inc. 900 East Benson Boulevard P. O. Box 196612 Anchorage, Alaska 99519-6612 (907)561-5111 RE: Duck Island Unit, Eider Oil Pool Annual Reservoir Surveillance Report Dear Ms. Foerster: BP Exploration (Alaska) Inc., as operator of the Duck Island Unit, hereby submits the attached Annual Reservoir Surveillance Report in accordance with the requirements of Conservation Order 449. This report covers the period January 1, 2013 through December 31, 2013. The report is organized according to the outline provided in Rule 12 of the conservation order. A shut-in well list addressing 20 AAC 25.115 has been included in the Endicott Oil Pool Reservoir Surveillance Report submitted in a separate filing. BP reserves the right to alter the content of the analyses contained in this report at any time based upon the most recent surveillance information obtained. 101 Should you have any questions please contact Eko Apolianto (564-4569) or Tanner Gansert (564-5183). Sincerely, Katrina Garner cc: Kevin Banks, DNR R. L. Skillern, BP Eider File Annual Reservoir Surveillance Report Duck Island Unit Eider Oil Pool January 2013 through December 2013 Completed: March 2014 Table of Contents Page A. Progress of Enhanced Recovery Project Implementation and Reservoir Management Summary....................................................................................................................................3 B. Voidage Balance.....................................................................................................................4 C. Analysis of Reservoir Pressure Surveys Within the Pool.........................................................5 D. Results and Analysis of Production and Injection Log Surveys, Tracer Surveys and ObservationWell Surveys...........................................................................................................5 E. Review of Pool Production Allocation Factor and Issues Over the Prior Year..........................5 F. Future Development Plans......................................................................................................6 2 A) Progress of Enhanced Recovery Project Implementation and Reservoir Management Summary BPXA drilled two wells into the Eider reservoir: 2-56A/EI 01 ("Eider 1 ") and 2-30A/EI 02 ("Eider 2"). The Eider 2 well was shut in May 1999 at the end of the approved test period, and the Eider 1 well was shut in September 1999. BPXA converted the Eider 1 well to water injection in June 2000 after receiving the proper Endicott partner approval. Production from Eider 2 well recommenced in June 2000 with the start of water injection. Over the next couple of years, static bottomhole pressure (SBHP) measurements were obtained in both Eider wells to determine the extent of pressure support. With SBHP's rising in the Eider 1 well and falling in the Eider 2 well, there was a clear indication that the producer / injector pair were not in pressure communication with one another. BPXA converted the Eider 1 well back to production in July 2004 and subsequently perforated shallower sands in both wells. The Eider 2 well was sidetracked (2-30B/ME-01) in 2009 to the Minke target, a Sag River/Ivishak formation satellite prospect. Producer 2-56A/El01 was brought online once in 2009 to conduct a well test which indicated that the production characteristics of the well had not changed. (1 bopd, watercut — 100%). The well remained shut in until May 2013 when the Ivishak formation was isolated and the Sag River formation was perforated. Total production during 2013 was 34.5 mstb oil, 1.9 bscf gas, and 5.8 mstb water from the Sag River formation. These values also reflect cumulative Sag River production through December 2013. Cumulative Ivishak production through December 2013 was 2.75 mmstb oil, 26.52 bscf gas, and 5.52 mmstb water. There has been no injection into the Eider pool during 2013. Cumulative injection into the Eider Pool through December 2013 was 4.33 mmstb water, all of which was injected into the Ivishak formation. During 2013, all produced were processed through the Endicott facility as stipulated under conditions within the Endicott Facility Sharing Agreement. Produced gas, other than that used for fuel, was re -injected into the Endicott reservoir gas cap. There are no multiphase (Gen -2) meters installed in the Eider Oil Pool. 3 B) Voidage Balance The voidage balance by month of produced and injected fluids and the cumulative voidage of the Eider Pool is shown below in Figure 1. The figure reflects production from both the Ivishak and Sag River Formations. Figure 1: Eider Cumulative Voidage 4 C) Analysis of Reservoir Pressure Surveys within the Pool One pressure survey was completed in May 2013 in 2-56A/E101. Pressure data since startup are graphically represented in Figure 2, below. Region: Eider Zones: Ivishak, Sag River Pressure vs. Time 5500 U E 5000 — N 4500 41.000 ❑ - (3^S 3500 -- cu 3000 m � a- 2500 ❑ ❑M I ■ 2000 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 ■ 2-30A, Ivishak &2-56, Ivishak ❑ 2-56A, Ivishak 2-56A, Sag River BP Exploration, Endicott Figure 2: Eider Pressure Data D) Results and Analysis of Production and Injection Log surveys, tracer surveys and observation well surveys No production, injection logging or tracer surveys were performed during 2013 on wells in the Eider Pool i E) Review of pool production allocation factors and issues over the prior year The allocation factor for Eider well has been set at 1.0 when the wells are producing. 5 Extrapolated Pressure at -9700' TVDss Datum Well Date (psia) Data Source SBH P 2-56A/E101 5/19/2013 4185 Pressure data since startup are graphically represented in Figure 2, below. Region: Eider Zones: Ivishak, Sag River Pressure vs. Time 5500 U E 5000 — N 4500 41.000 ❑ - (3^S 3500 -- cu 3000 m � a- 2500 ❑ ❑M I ■ 2000 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 ■ 2-30A, Ivishak &2-56, Ivishak ❑ 2-56A, Ivishak 2-56A, Sag River BP Exploration, Endicott Figure 2: Eider Pressure Data D) Results and Analysis of Production and Injection Log surveys, tracer surveys and observation well surveys No production, injection logging or tracer surveys were performed during 2013 on wells in the Eider Pool i E) Review of pool production allocation factors and issues over the prior year The allocation factor for Eider well has been set at 1.0 when the wells are producing. 5 F) Future Development Plans Annual pressure testing and reservoir characterization work on the Eider pool will continue. Upon identification of any potential targets, BPXA will evaluate wellwork and sidetrack opportunities in order to increase recovery from the Eider PA. The potential to redeploy the remaining Eider well to targets outside the Eider Participating Area may also be considered. D