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Home My WebLink About2000 Tabasco Oil PoolpupsPHILLIPS Alaska, A Subsidiary of PHILLIPS PETROLEUM COMPANY John C. Braden Supervisor Greater Kuparuk Area Development ATO - 1276 Phone 263-4536 March 29, 2001 IJIs. Julie Heusser, Commissioner Alaska Oil and Gas Conservation Commission 333 West 71h Ave. Suite #100 Anchorage, Alaska 99501-3539 Re: 2000 Tabasco Oil Pool Annual Reservoir Surveillance Report Dear Ms. Heusser: In compliance with Rule 11, Conservation Order No. 435, Phillips Alaska, Inc., operator of the Kuparuk River Field, is hereby submitting the annual report on the Tabasco Oil Pool. This report documents the required information pertinent to the field development and enhanced recovery operations from January through December 2000. The following is an outline of the information provided: a. A summary of the enhanced recovery project (Attachment 1). b. Voidage balance, by month, for produced and injected fluids (Attachment 2, Attachment 3). c. Analysis of reservoir pressure surveys taken in 2000 (Attachment 4). d. Results of production surveys, and any special surveys, taken on the Tabasco Oil Pool in 2000 (Attachment 5). e. Results of well allocation and test evaluation for Rule 7, and any other special monitoring (Attachment 6). f. Future development plans (Attachment 7). If you have any questions concerning this data, please contact Jim Ennis at (907) 265-1544. Sincerely, John C. Braden GKA Development Supervisor bcc: Central Files ATO - 320 Jim Ennis ATO - 1208 Ron Marquez NSK - 69 Balog & Doman NSK - 69 Attachment 1 Kuparuk River Unit Tabasco Oil Pool 2000 Annual Reservoir Surveillance Report Summary of the Enhanced Recovery Project Tabasco produced 1910 MSTB of crude, 203 MMSCF of formation gas, and 4408 MB of water during 2000. Water injection was 5545 MB over the same period. Cumulative oil, gas, and water production and water injection through year end 2000 were 4315 MSTBO, 620 MMSCF, 5804 MBW, and 8322 MBWI, respectively. The cumulative injection/withdrawal ratio was 0.8 on a reservoir barrel basis through year end 2000. Reservoir pressure declined from approximately 1220 psi to 1100 psi during 2000. Two new producers were completed with openhole gravel packs and electric submersible pumps were installed for artificial lift. Resulting production from the new wells is significantly poorer than anticipated. A workover of injector 2T- 210 was unsuccessful at repairing mechanical problems which continue to prevent water injection. Year end 2000 Tabasco well count (all at Kuparuk River Unit Drill Site 2T) was: Producers: 7 completed 7 on line Injectors: 2 completed 1 on line Water production increased to a year end water:oil ratio of 3.1 bbl water per STBO. Water breakthrough occurred at all 7 producers. Production and injection logs, coupled with the structural positions and water breakthrough histories of the producers, suggest that the water production mechanism is dominated by gravity -induced slumping. Attachment 2 Tabasco Oil Pool 2000 Annual Reservoir Surveillance Report Produced Fluid Volumes OIL GAS WATER CUM OIL CUM GAS CUM WATER MO YR STB MSCF BBL STB MSCF BBL 1 2000 218596 21663 213955 2623041 438238 1609442 2 2000 177861 18857 288396 2800902 457095 1897838 3 2000 167362 16954 278430 2968264 474049 2176268 4 2000 176325 17125 367238 3144589 491174 2543506 5 2000 167387 16393 412309 3311976 507567 2955815 6 2000 156973 17791 385476 3468949 525358 3341291 7 2000 155250 17715 403917 3624199 543073 3745208 8 2000 136003 15511 391067 3760202 558584 4136275 9 2000 125005 14133 404654 3885207 572717 4540929 10 2000 147469 16503 409172 4032676 589220 4950101 11 2000 141645 15353 414915 4174321 604573 5365016 12 2000 140691 15329 438678 4315012 619902 5803694 2000 TOTAL 1910567 203327 4408207 Attachment 3 Tabasco Oil Pool 2000 Annual Reservoir Surveillance Report Injected Fluid Volumes WATER GAS NGLS CUM WATER CUM GAS CUM NGLS MO YR STB MSCF MSCF STB MSCF MSCF 1 2000 392436 0 0 3170115 0 0 2 2000 413716 0 0 3583831 0 0 3 2000 529421 0 0 4113252 0 0 4 2000 550341 0 0 4663593 0 0 5 2000 511120 0 0 5174713 0 0 6 2000 466871 0 0 5641584 0 0 7 2000 476327 0 0 6117911 0 0 8 2000 447992 0 0 6565903 0 0 9 2000 432215 0 0 6998118 0 0 10 2000 448669 0 0 7446787 0 0 11 2000 447578 0 0 7894365 0 0 12 2000 428168 0 0 8322533 0 0 2000 TOTAL 5544854 0 0 Attachment 4 Kuparuk River Unit Tabasco Oil Pool 2000 Annual Reservoir Surveillance Report Reservoir Pressure Surveys Rule 8 Form 10-412 follows �^f) (D E N c2 t2 02 r C) O m a i � m H O U a 6 C9 o _ c � B � a U o c a J O O U O c m 6 � J � U) '6 all0000 o m U UD q 0 p u) M O a .0 m o 00 00 Y U 2 m r3 O m C m a T= OO O 0 00 00 c c Q M E a 2 m O d v M Q 6 Z l x M 1� n O N 0 000 o m m 5 c m N r Q w N oO O a` n O N N to N _ i n E lz go m� 7 OU 75 } Q Cl) Cl) c^'7 V 'C 2 o a � Y � NM O 0 0) 0 O m Z c D :Q m 3 a i N a O C (o N o) Lo O) M O V C m m C E O a = O n m ° a 0 0 0 0 0 W m mcflvr<or O O O O O m N m m n C c%) co c0 O Q p � 0 0 0 0 0 Y U (� m 6 `o § O O O O O O B m 0 0 0 0�} 0�+0 Q N � � CO � Cl)M m Q� z N N N N N co Cl) co M Cl) O O O O O m > L y O O O O O Un Un Lo u) Ln O m 2 a O U C E D Y O� f- z Q a O p m p t U m E 0^ O7 T m Q E- 2 z 0 0 � N N N N N m Cm E O C Attachment 5 Kuparuk River Unit Tabasco Oil Pool 2000 Annual Reservoir Surveillance Report Production Logs and Special Surveys Well Date Type Comments None N/A None No logs or production surveys were run during the calendar year 2000, Attachment 6 Kuparuk River Unit Tabasco Oil Pool 2000 Annual Reservoir Surveillance Report Wells Allocation and Test Evaluation Summary A minimum of two well tests per month were taken on production wells. Fluid samples were obtained on a regular basis, and water cut corrections were applied to well tests as required based on the subsequent lab analysis. Generally, very good agreement was observed between the phase dynamics and the shakeout analysis. Production volumes were tracked through the Setcim production monitoring system. Tabasco production was applied an allocation factor of 1.0 for 2000. Attachment 7 Kuparuk River Unit Tabasco Oil Pool 2000 Annual Reservoir Surveillance Report Future Development Plans Tabasco Drill Site 2T development plans for 2001 and beyond were created to take advantage of the gravity -induced water slumping. Horizontal producers are planned near the top of the interval to provide vertical standoff from the water. The design phase for a horizontal producer was begun in 1999. Studies of horizontal hole stability, drill -in and completion fluids, and completion equipment are in progress. It is expected that the first horizontal producer will be drilled in early 2002. Current plans include drilling a total of three horizontal producers. Injection plans call for increasing injection to accomplish a cumulative net zero voidage and restore original reservoir pressure. Another workover to mitigate mechanical problems at injector 2T-210, which prevent water injection, is being considered. Two new vertical injectors or a structurally low horizontal injector are planned to support the additional offtake from planned future producers. However, conversion(s) of an existing producer(s) to water injection is also being considered as an alternative to new injectors. The feasibility of polymer flooding was studied in 2000 and laboratory tests are ongoing to confirm viability. A full -field reservoir model is currently being built to optimize potential water and/or polymer injection schemes. Screening evaluations indicate that Tabasco development beyond Drill Site 2T is most prospective at Kuparuk River Unit Drill Sites 3H and 3G. Tabasco geologic and engineering studies in 1999 identified Drill Site 3H appraisal well locations which may be drilled as early as fourth quarter 2002.