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Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
Administration >  AOGCC >  Statistical Reports >  Current Oil & Gas Pools Statistics >  Milne Point Unit, Ugnu Oil Pool
AOGCC Pool Statistics
Milne Point Unit, Ugnu Undefined Oil Pool
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Operator: BP Exploration (Alaska) Inc. Index Map
Discovery Well: Standard Oil of California 
  Kavearak Pt #32-25
  Permit #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: Shut-in
Location: Central Arctic Slope Area Location Map Pool Location Map DNR Unit Map
References: List of Orders Summary - Annotated Reference List  
Summary:

The Ugnu Undefined Oil Pool is located in the northern portion of the Kuparuk River Unit (KRU) and the southwestern portion of the Milne Point Unit ("MPU"). Within the MPU, these oil-bearing sands were first encountered in 1969 by Standard Oil of California’s Kavearak Point 32-25 exploratory well (MPU K. Pt. 32-25). This undefined pool comprises an accumulation of oil trapped within the lower portion of the informally named Ugnu sands that were deposited during the latest Cretaceous (Maastrichtian) to earliest Tertiary (Paleocene). These sands correlate with the interval from 4,015’ and 4,255’ measured depth (-3,978’ to -4,218’ below sea level) in MPU K. Pt. 32-25.

During November 2003, the Alaska Oil and Gas Conservation Commission (AOGCC) approved Amendment No. 1 to Area Injection Order No. 10B (AIO 10B.01), allowing BP Exploration (Alaska), Inc. to conduct a three-year pilot injection project within the Ugnu sands in the S-Pad development area within the southern MPU. This project was intended to test concepts and feasibility of recovery processes not yet proven effective in the Ugnu Formation. Oil production from the pool was subsequently reported for a single well (MPU S-22) between November 2003 and September 2004, and production peaked at an average rate of 152 barrels of oil per day (BOPD) during March 2004. The pool was then shut-in. Regular production resumed from April to August 2011 through well MPU S-41A, and production peaked at an average rate of 459 BOPD in July 2011, with a 4% water cut and a gas-oil ratio of about 175. The pool returned to shut-in status in September 2011. As of November 2011, AOGCC’s projection and injection database indicates that there are no dedicated injection wells completed within the MPU Ugnu Undefined Oil Pool, and there are no reports of regular water injection into the pool.

Geology:

Within the MPU, the lower Ugnu consists of fine- to coarse-grained sand layers that range up to 55 vertical feet in thickness and are interbedded with siltstone and mudstone. These sand layers are locally termed the M-series sands (MC, MB, and MA, in ascending order). The Cretaceous-Tertiary boundary lies within the lower Ugnu sands: the upper portion of the lower Ugnu correlates to the base of the Sagwon member of the Sagavanirktok Formation (Paleocene-aged), and the lower portion of the lower Ugnu correlates to the Prince Creek Formation (Maastrichtian-aged). The lower Ugnu conformably overlays the underlying N-series sands, which are assigned to the Schrader Bluff Formation. The N-series sands, in turn, overlay the West Sak Sands (locally termed the O-series sands) that are also assigned to the Schrader Bluff Formation. The lower Ugnu is believed to have been deposited in delta plain and fluvial environments.

The structure of the Ugnu sands is a monocline that dips gently (1°to 2°) toward the northeast. The top of the structure lies between -2,000’ and -4,000’ below sea level. Viscous oil has accumulated discontinuously in the lower Ugnu sands across the northeastern KRU and the southwestern MPU. Faulting and facies changes are believed to be the trapping mechanisms within these reservoirs. Lower Ugnu oil ranges in API gravity from 8°to 12°, in viscosity from 10,000 to 100,000 centipoise, and in gas-oil ratio from about 60 to 175. The reservoir temperature ranges from 65 to 75° F.

  Strat Column Representative Log
Production: Prod Chart    

  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 51,218 0 10,290 1,950
2005 Total
0 0 0 0
2006 Total
0 0 0 0
2007 Total
0 0 0 0
2008 Total
511 0 0 0
2009 Total
0 0 0 0
2010 Total
0 0 0 0
2011 Total
33,961 0 6,920 1,950
2007 Rate (b/d)
0 0 0 0
2008 Rate (b/d)
1 0 0 0
2009 Rate (b/d)
0 0 0 0
2010 Rate (b/d)
0 0 0 0
2011 Rate (b/d) 91 0 19 5
2008 Change (%)
100 0 0 0
2009 Change %)
-100 0 0 0
2010 Change %)
0 0 0 0
2011 Change (%)
100 0 100 100

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