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Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
Administration >  AOGCC >  Statistical Reports >  Annual Pool Statistics - 2004 >  Prudhoe Bay Unit, Niakuk Oil Pool
AOGCC Pool Statistics
Prudhoe Bay Unit, Niakuk Oil Pool
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Operator: BP Exploration (Alaska) Inc.

Discovery Well: Sohio
  Niakuk No. 5
  Permit #185-027
  API No. 50-029-21290-00-00
  Sec. 30, T12N, R16E, UM

Depth: 11,507 MD / 10,643' TVD

April 18, 1985
Status: Producing
Location: Central Arctic Slope Area Location Map Unit Location Map DNR Unit Map
Orders: Complete List
Summary:
The Niakuk oil pool is defined as the accumulation of oil and gas in the Kuparuk River Formation ("Kuparuk") that correlates with the interval between 12,318 feet and 12,942 feet measured depth (9351 feet and 9842 feet true vertical depth subsea).  Regular production began from the pool in April 1994, and peaked at 37,172 barrels of oil per day in September 1996.  Since 2000, Niakuk oil production has declined at an average rate of about 15% per year.  During December 2004, Niakuk averaged 7,239 barrels of oil per day, 36,565 barrels of water per day, and 6,861 MCF of gas per day.

Geology:
Lateral heterogeneity and abrupt facies change characterize the Kuparuk in the Niakuk area.  The Niakuk reservoir contains two elongated, oil-bearing segments that do not appear to be in hydraulic communication.  Normal faults bound the two segments on the north and south, and numerous moderate-displacement normal faults cut the reservoir.  The western segment ("Segment 1") contains approximately 545 acres.  The eastern segment ("Segment 2") contains approximately 1,310 acres.  Porosity in Segment 1 varies from 15.2% to 24.4%, permeability varies from 6 to 1,250 millidarcies, and oil saturation ranges from 66% to 75%.   In Segment 2, porosity ranges from 19.5% to 23.0%, permeability varies from 1 to 3,008 millidarcies, and oil saturation ranges from 67% to 79%.  Oil gravity measures 24.0 degrees API.  A gas-oil-contact has not been identified in the Niakuk wells. Estimated original oil in place ("OOIP") for the Niakuk reservoir is 137.4 MMSTB (56.1 MMSTB in Segment 1 and 81.3 MMSTB in Segment 2) and original gas in place ("OGIP") is 90.9 BSCF. 

Structure Map Strat Column
Orig. Oil in Place: 137.4 MMSTB (CO 329)
Orig. Gas in Place: 90.9 BSCF (CO 329)
Production: Prod Chart Prod Report Prod Data

  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 80,267,630
955,457 67,440,715 57,219,279
2001 Total 6,912,585 108,561 5,835,838 4,551,434
2002 Total 5,813,941 54,534 4,287,368 8,399,021
2003 Total 4,599,262 38,534 3,385,803 10,461,065
2004 Total 3,803,343 122 3,021,718 12,258,973
2003 Daily Rate 12,601 106 9,276 28,660
2004 Daily Rate 10,420 122 8,279 33,586
Change (%) -17% 15% -11% 17%

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