Alaska Department of Administration

Alaska Oil and Gas Conservation Commission

AOGCC Pool Statistics

Milne Point, Schrader Blff Oil Pool


Operator
HILCORP ALASKA LLC
Discovery Well
STANDARD OIL CO OF CALIFORNIA
KAVEARAK PT 32-25
Permit No.169-051
API No. 50-029-20028-00-00
Sec. 25, T13, R10E, UM
Depth: 9799' MD / 9799' TVD
October 24, 1969
Map Image Unavailable

Summary

The Schrader Bluff Oil Pool at Milne Point was discovered in 1969 by the Socal Kavearak Pt. 32-25 well. The pool was initially delineated and then developed by Conoco, Inc. through drilling programs that began in 1989.1 Regular production began during March 1991, peaked at an average rate of 3,700 barrels of oil per day (“BOPD”) in October 1991, and declined to an average of about 2,850 bopd (about 15% of MPU production) by mid-1993.2

In early 1994, BP became operator of the Milne Point Unit (“MPU”) and began an aggressive development program. By June 1996, development drilling at E-Pad and additional wells at H- and J-Pads caused production to increase steadily until it reached 12,000 bopd in April 2002. During September 2002, BP’s extensive S-Pad development began production, and Schrader Bluff production immediately jumped to 20,000 bopd. Production from the pool peaked at 23,922 BOPD in October 2003, and for the first six months of 2011, it averaged about 8,262 BOPD, or about 35% of current MPU production. For the first six months of 2016, the pool has averaged 6,946 BOPD and 14,327 barrels of water per day (67% water cut) from 35 to 38 production wells.

At present, more than 300 wells and well bores have been drilled to or through the pool, and 103 have produced from it. The Schrader Bluff Oil Pool is developed on 10-acre spacing.3

Production

Geology

The Schrader Bluff Oil Pool (“SBOP”) was originally defined in the Milne Point Unit (“MPU”) A-1 well. However, a more typical and representative section for the pool lies between 4,100 and 4,726 feet measured depth in MPU G-1. The pool occurs within the Schrader Bluff Formation, which was deposited during the Late Cretaceous Period (Maastrichitian).

At Milne Point, the Schrader Bluff is divided into two stratigraphic intervals designated, from oldest to youngest, the "O-sands" and the "N-sands.” The O-sands consist of very fine to fine-grained sandstone interbedded with siltstone and mudstone that were deposited under shallow marine conditions in the distal portion of a delta system. The overlying N-Sands were deposited within a muddy marine shelf system. Mudstone and siltstone dominate the lower portion of this interval, but the sediments coarsen upward, becoming fine- to medium-grained sandstone that dominates the upper part of the N-Sand interval.

The SBOP structure is a homocline that dips 1 to 2 degrees to the east-northeast, and lies between 3,400 and 5,200 feet true vertical feet below sea level. NW and NE-trending faults compartmentalize the pool. Reservoir intervals average 28% porosity and 171 millidarcies permeability.4 The temperature of the reservoir is about 80 degrees F.5


Last Revised
29 Aug 2016 sfdavies

1Alaska Oil and Gas Conservation Commission, 2010, Well Information Database
2Alaska Oil and Gas Conservation Commission, 2016, Production Database
3Alaska Oil and Gas Conservation Commission, 2002, Conservation Order No. 477, Milne Point Field - Milne Point Unit, Schrader Bluff Oil Pool
4Alaska Oil and Gas Conservation Commission, 2002, Conservation Order No. 477, Milne Point Field - Milne Point Unit, Schrader Bluff Oil Pool
5Alaska Oil and Gas Conservation Commission, 2002, Conservation Order No. 477, Milne Point Field - Milne Point Unit, Schrader Bluff Oil Pool