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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
Colville River Unit, Nanuq-Kuparuk Oil Pool (Terminated)
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Operator: ConocoPhillips Alaska, Inc. Index Map
Discovery Well: ARCO Alaska Inc.
  Nanuk No. 1
  Permit #196-057
  API No. 50-103-20238-00-00
  Sec. 19, T11N, R05E UM

Depth: 7,630’ MD / 7,630' TVD

March 24, 1996

Status: Terminated - Incorporated into Alpine Oil Pool
Location: Central Arctic Slope Area Location Map Pool Location Map DNR Unit Map
References: List of Orders Summary - Annotated Reference List  
Summary:

This pool has been terminated, and is presented for historical purposes only. Conservation Order 443B, issued March 26, 2009, terminated the Nanuq-Kuparuk Oil Pool and incorporated the reservoir into the Alpine Oil Pool. Drilling and development operations demonstrated that the Nanuq-Kuparuk reservoir and the underlying Alpine reservoir are in pressure communication throughout the central and southern Colville River Unit. According to AS 31.05.170(12), these two reservoirs must be classified as a single oil pool because they are in pressure communication. All affected production and injection records have been re-assigned to the expanded Alpine Oil Pool.

 

The Nanuq-Kuparuk Oil Pool was discovered in 1996 by the Nanuk No.1 exploratory well, and confirmed by the Nanuk No.2 exploration well during 2000. Three additional wells, Nanuq No.3, Nanuq No. 5 and CRU CDI-229, delineated the accumulation. Regular production began in November 2006, and reached an average daily oil production rate of 19,400 barrels during December 2006. Additional wells were brought online during 2007 and 2008, and during September 2008, pool production peaked at an average rate of 26,290 barrels of oil per day. In December 2008, daily production from the pool averaged 22,949 barrels of oil, 31.1 million cubic feet of gas, and 61 barrels of water.

Prior to its termination, the Nanuq-Kuparuk Oil Pool was defined as the accumulation of hydrocarbons common to, and correlating with, the interval between the measured depths of 7,956 feet and 7,972 feet in the Nanuk No.2 well.

 


Geology:

The Nanuq-Kuparuk reservoir lies within the Early Cretaceous-aged Kuparuk River Formation. The reservoir is a thin, transgressive, shallow marine sandstone that lies atop the Lower Cretaceous Unconformity ("LCU"), which is a regional erosional surface. It consists of fine- to medium-grained, quartz-rich sandstone that contains varying amounts of glauconite, and ranges from 5 to 15 feet thick. Net pay averages 6 feet, porosity averages 18 percent, and permeability averages 100 millidarcies. The original reservoir pressure measured 3,240 psia.

 

Geochemical analysis indicates oil from the Nanuq-Kuparuk reservoir is closely related to oil from the overlying Nanuq reservoir, which lies about 700 true vertical feet shallower. Production and RFT samples indicate the crude oil gravity is 40 to 41 degrees API. Oil viscosity is estimated to be 0.5 centipoise, and the solution GOR is estimated at 990 SCF/STB. No gas or water contacts have been identified within this proposed oil pool.

 

The Nanuq-Kuparuk reservoir is overlain by mudstone and shale assigned to the Kuparuk D interval, Kalubik Shale, HRZ, and basal Torok, in ascending order. The reservoir is underlain by silty shale assigned to the Jurassic-aged Miluveach Formation.

 

The Nanuq-Kuparuk Oil Pool lies atop the LCU. Within the development area, the LCU forms a homocline that dips gently to the west-southwest at 30 to 120 feet per mile. A single, small fault has been mapped in the northern portion of the pool, but is not expected to affect recovery.

 

  Strat Column Type Log
Production: Prod Chart    
  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 14,601,865 0 12,104,231 6,988
2005 Total 0 0 0 0
2006 Total 661,119 0 471,077 0
2007 Total 6,078,919 0 4,358,159 1,312
2008 Total 7,848,597 0 7,286,721 5,676
2009 Total 0 0 0 0
2010 Total 0 0 0 0
2011 Total
0 0 0 0
2007 Daily Rate 16,655 0 11,940 4
2008 Daily Rate 21,503 0 19,964 16
2009 Daily Rate 0 0 0 0
2010 Daily Rate 0 0 0 0
Change 2007-08 (%) 29% 0 67% 300%
Change 2008-09 (%) 0 0 0 0
Change 2009-10 (%) 0 0 0 0
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