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Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
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AOGCC Pool Statistics
Milne Point Unit, Sag River Oil Pool
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Operator: BP Exploration (Alaska) Inc.
Index map
Discovery Well: Standard Oil of California 
  Kavearak Pt No. 32-25
  Permit No. 169-051
  API No. 50-029-20028-00-00
  Sec. 25, T13N, R10E, UM

Depth: 9,799’ MD / 9,799' TVD

August 6, 1969

Status: Producing
Location: Central Arctic Slope Area Location Map   DNR Unit Map
Orders: List of Orders Summary - Annotated References  
Summary:

The Sag River Oil Pool was discovered in 1965 by Standard Oil Company of California’s Kavearak Point 32-25 exploratory well. The pool was first successfully tested in 1980 by Conoco Inc.’s MPU A-01 well, which yielded a twelve-hour stock tank average rate of 440 barrels of oil per day (BOPD). Oil gravity in the Sag River is about 39 degrees API. The pool is defined as the accumulation of hydrocarbons common to, and correlating, with the interval between the measured depths of 8,810' and 8,884' in the MPU A-01 well. It is developed on 40- acre spacing.

Regular production from the pool began in 1995. Five wells, C-23, E-13A, F-33, F-33A and K-33, have produced from the pool, and one well, F-73A, has been used as a water-alternating-gas and water injector. Between 2002 and mid-2009, F-33A was the only active producer. Water-alternating-gas injection began in F-73A during July 2002 in support of the F-33A producer, but injection was halted in May 2004. In June 2007, BP began regular water injection into F-73A. During October 2009, C-23 was re-activated as a producer, causing average oil production to jump quickly from 272 BOPD in September 2009 to 1069 BOPD in November 2009. For the first 9 months of 2011, production from the pool averaged 306 BOPD with 68% water cut.

Geology:

The Sag River consists of late Triassic to early Jurassic-aged, thin marine shelf sediments. At Milne Point, the Sag River is divided into four laterally extensive zones that are named, from deepest to shallowest, A through D. Zone D is non-reservoir siltstone and shale at the top of the Sag River; and its average gross thickness is about 21 feet. Zone C is the uppermost sandstone interval, which is generally of poor reservoir quality with porosity to 17%, permeability to 2.9 millidarcies, and an average gross thickness of 10 feet. Zone B is the primary reservoir interval, with porosity to 21%, permeability to 23 millidarcies, and an average gross thickness of 30 feet. Zone A is the basal sandstone unit, which is composed almost entirely of non-reservoir sandstone, with porosity to 18%, permeability to 1.2 millidarcies, and an average gross thickness of about 16 feet. Zone A unconformably overlies the Shublik Formation.

At Milne Point, the moderate to good porosity and poor permeability observed in zones A through C are the result of bioturbation and diagenesis. The trapping mechanism observed in the pool is predominately structural, consisting of three-way anticlinal closures sealed against the downthrown side of faults, with throws generally greater than 50 feet. Within the MPU development area, an orthogonal fault pattern segments the oil accumulation into three known equilibration regions, with known oil-water contacts at 9,150', 9,050', and 8,950' true vertical depth subsea.

  Strat Column Type Log
  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 2,384,9974 0 2,441,964 2,298,710
2005 Total
88,079 0 125,076 144,326
2006 Total
102,449 0 107,331 96,927
2007 Total
69,276 0 55,942 13,096
2008 Total
66,390 0 45,912 75,954
2009 Total
141,100 0 86,796 85,482
2010 Total
226,249 0 288,565 153,154
2011 Total
102,421 0 136,494 315,680
2007 Rate (b/d)
190 0 153 36
2008 Rate (b/d)
182 0 126 208
2009 Rate (b/d)
387 0 238 234
2010 Rate (b/d)
620 0 791 420
2011 Rate (b/d) 281 0 374 865
2008 Change (%)
-4 0 -18 478
2009 Change (%)
113 0 28 13
2010 Change (%)
60 0 232 79
2011 Change (%)
-55 0 -53 106

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