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) within well Niakuk No. 6.1
Regular production from the pool began in April 1994, and peaked at 37,172 barrels of oil per day in September 1996. During December 2004, Niakuk averaged 7,239 barrels of oil per day. By December 2009, the pool averaged 4,640 barrels of oil per day. For the first six months of 2011, production from the pool has averaged 3,240 barrels of oil per day from 10 wells at an average water cut of 89 percent. For the first six months of 2016, the pool averaged 1,257 BOPD from 9 wells at an average water cut of 94 percent.2
Two drill sites contribute production from this pool: Niakuk (about 96 percent of production) and Lisburne L5 (about 4% of production).
Lateral heterogeneity and abrupt facies change characterize the Kuparuk in this 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%. Reservoir temperature is 181° F, oil gravity measures 24.0 degrees API, and the estimated bubble point pressure is 3,835 psia. A gas-oil-contact has not been identified in the Niakuk wells.3
11 Aug 2016 sfdavies
1Alaska Oil and Gas Conservation Commission, 1994, Conservation Order No. 329, Prudhoe Bay Field, Niakuk Oil Pool↩ 2Alaska Oil and Gas Conservation Commission, 2016, Well and Production Information Database↩ 3Alaska Oil and Gas Conservation Commission, 1994, Conservation Order No. 329, Prudhoe Bay Field, Niakuk Oil Pool↩