ConocoPhillips and Anadarko Petroleum Corp. said today that they have successfully appraised the 2001 Spark discovery in the National Petroleum Reserve-Alaska on Alaskaís North Slope.
The companies drilled two appraisal wells in the Spark accumulation, the Carbon No. 1 and the Spark No. 4.
The Carbon No. 1 appraisal well, about five miles northwest of the Spark No. 1A discovery well, encountered an Upper Jurassic reservoir, the companies said. An unstimulated well test flowed at a maximum rate of 24 million cubic feet per day of gas and 1,250 barrels per day of condensate. The condensate fluid gravity was 59 degrees API, and the flowing tubing pressure was measured at 905 psi.
The Spark No. 4 well was drilled about three miles northeast of Carbon No. 1 and penetrated a similar hydrocarbon-bearing reservoir interval, but was not tested, the companies said.
The Spark accumulation is adjacent to the 2001 Lookout discovery, which was successfully appraised in 2002. The Lookout No. 2 appraisal well tested at a rate of 4,000 bpd of oil and 8 million cubic feet per day of natural gas after fracture stimulation. The oil and gas also were produced from an Upper Jurassic reservoir interval. The oil had an API gravity of 40 degrees, and a flowing tubing pressure of 1,025 psi.
The companies said technical and commercial evaluation of the Lookout (CD-6) and Spark (CD-7) discoveries is already under way as part of the Alpine satellites environmental impact statement. Spark and Lookout are 15 and 24 miles, respectively, southwest of the Alpine oil field.
Ownership in these discoveries and the Alpine oil field are: ConocoPhillips (operator) 78 percent and Anadarko 22 percent.
Editorís note: see full story in Sept. 19 issue of Petroleum News.