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Home My WebLink About2011 Eider Oil PoolEmeka Emembolu Head of Base Management BP Exploration Alaska March 31, 2012 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 Phone: (907) 564-5366 Fax: (907) 564-4440 Email emeka.emembolu@bp com Web: www.bp.com RE: Duck Island Unit, Eider Oil Pool Annual Reservoir Surveillance Report Dear Mrs. 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 through December 31, 2011. 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. Should you have any questions please contact Katrina Cooper (564-4212) or Jamie Weinburger (564-5368). Sincerely, 6;Y Emeka Emer-obolu cc: Kevin Banks, DNR R. L. Skillern, BP Eider File Annual Reservoir Surveillance Report Duck Island Unit Eider Oil Pool January 2011 through December 2011 March, 2011 Table of Contents A. Progress of Enhanced Recovery Project implementation and Reservoir Management summary B. Voidage Balance by Month of Produced Fluids and Injected Fluids and cumulative status C. Analysis of reservoir pressure surveys within the pool D. Results and Analysis of Production and Injection Log surveys, tracer surveys and observation well surveys E. Review of pool production allocation factors and issues over the prior year F. Future Development Plans 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/E101 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%). Since this well test, the well has been shut-in due to uncompetitive water cut. There were 0 days of production from the Ivishak formation for the time period of January 2011 through December 2011. Cumulative production through December 2011 was 2.75 mmstb oil, 26.52 bscf gas, and 5.52 mmstb water. There was no injection into the Ivishak formation for the time period of January 2011 through December 2011. Cumulative injection through December 2011 was 4.33 mmstb water. All produced fluids have been processed through the Endicott facility as stipulated under conditions within the Endicott Facility Sharing Agreement. Produced gas, other than that used for fuel, has been re -injected into the Endicott reservoir gas cap. 3 75 E m 0 LL ar m 0 LL 0 0 m 0 4) 0) m '0 .5 m 't ---------- -- - - – -------------- — - - ------- - - - ------------ ------ ----- ------ ... . ..... .......... . ......... ........ .. 00 't C) Analysis of reservoir pressure surveys within the pool One pressure survey was completed in March 2011 in 2-56A/El01. Pressure data since startup are graphically represented in the next figure that is a plot of pressure versus time. These data indicate pressures have not changed significantly in the past year - 5 Extrapolated Pressure at -9700 TVDss Datum, Well Date psia Data Source SBHP 2-56A/E101 3/27/11 4453 Pressure data since startup are graphically represented in the next figure that is a plot of pressure versus time. These data indicate pressures have not changed significantly in the past year - 5 W —C cn C: :3 iTj 0 t(D o CD 0 Of cz CD 0 C� C) CD CD C:) CD 0 CD C) C) CD 0 0 LO C) V) C) U') C) C� to LO IRr It m cn cv Lunjea ss 4141.4 OOL'6 112 ainssaJd 0 Ice 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 2011 on wells in the Eider Pool 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. F) Future Development Plans Annual pressure testing will continue. 7