Department of Administration

Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
Administration >  AOGCC >  Statistical Reports >  Annual Pool Statistics - 2004 >  Endicott Unit, Ivishak Oil Pool
AOGCC Pool Statistics
Endicott Unit, Ivishak Oil Pool
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Operator: BP Exploration (Alaska) INC.

Discovery Well: Sohio
  Sag Delta 34633 No. 4
  Permit #177-015
  API No. 50-029-20245-00-00
  Sec. 35, T12N, R16E, UM

Depth: 12,855’ MD / 10,895' TVD

March 13, 1978
Status: Producing
Location: Central Arctic Slope Area Location Map Unit Location Map DNR Unit Map
Orders: Complete List
The Ivishak Oil Pool of the Endicott Field (“EIOP”) lies beneath the Beaufort Sea and within the Duck Island Unit, about 8 miles east of Prudhoe Bay Unit (“PBU“). The Sag Delta No. 9 exploratory discovered this pool in 1982 well. This pool is the accumulation of hydrocarbons that is common to, and correlates with, Sag Delta No. 9 between the measured depths of 12,069’ and 12,314’. The EIOP has been developed from the Main Production artificial island that is located approximately 4 miles offshore in 2 to 14 feet of water. The pool has been producing continuously since July 1989. During the peak production years from November 1990 and November 1991, EIOP production ranged from 12,308 to 5,005 barrels of oil per day (“BOPD”), and averaged about 7,270 BOPD. Between December 1991 and June 1993, production dropped to an average of 2,650 BOPD. Since July 1993, production has slowly declined. During 2004, the EIOP averaged 83 BOPD from two production wells.

The pool encompasses reservoirs assigned to the Triassic-aged Ivishak Formation, which is a member of the Sadlerochit Group. This formation was deposited in a marine shoreface environment. The pool is bounded to the south by a major fault and there appears to be numerous smaller faults within the accumulations. The pool encompasses an area of approximately 380 acres, and it appears to be separate from other, nearby accumulations based on pressure measurements and oil gravity. The base of the Ivishak oil column appears to be planar, and is underlain by a tar mat, which separates the oil from the underlying aquifer. No gas cap has been observed. Oil gravity averages 25° API within the pool. The temperature is 212°F at 10,000 feet true vertical depth. Original oil in place is estimated to be approximately 14 million stock tank barrels (STB).
Structure Map Strat Column Type Log
Orig. Oil in Place: 14 MMSTB (Conservation Order 275)
Production: Prod Chart Prod Report Prod Data

  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 7,947,905
111,483 6,507,571 31,244,673
2001 Total 141,785 947 93,232 2,512,499
2002 Total 144,879 953 95,579 2,562,549
2003 Total 91,649
604 64,026 1,865,081
2004 Total 30,247 150 19,827 729,358
2003 Daily Rate 251 2 175 5,110
2004 Daily Rate 83 .41 54 1998
Change (%) -67% -80% -69% -61%
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