Rock Creek Oil Field CO2, Pilot Tests, Roane County, West Virginia

Abstract

This paper reports on the design and operation of two CO/sub 2/ EOR tests conducted in the Rock Creek field in Roane County, WV. The history, fluid properties, and geology of the Rock Creek field are presented first. The test area is then addressed more specifically with an evaluation of the cores and the geophysical logs of the injection, production, and observation wells. Finally, the injection history and the production response are documented. The first test was conducted in two 10-acre (4-ha), normal five-spot patterns, with 13,000 scf CO/sub 2//STB oil (2315 st m/sup 3//stock-tank m/sup 3/) injected. This test effort recovered 13,078 STB (2079 stock-tank m/sup 3/) of oil (3% of the original oil in place (OOIP)) but was terminated after 3 years before all oil capable of being mobilized was recovered. About 15% of an HCPV was injected. The first test was followed by a second, smaller test that, given the same amount of CO/sub 2/ to be purchased, would result in an increase in HCPV's of CO/sub 2/ injected and a greater potential for oil recovery. The second test was conducted in a 1.55-acre (0.63-ha), normal four-spot pattern contained within the original test pattern. This test lastedmore » 2 years, with 9,000 scf CO/sub 2//STB oil (1603 std m/sup 3//stock-tank m/sup 3/) injected. Recovery from this test was 3,821 STB (607 stock-tank m/sup 3/) of oil (11% of the OOIP). About 48% of an HCPV was injected. It appears that CO/sub 2/ miscible flooding is technically successful in Appalachian reservoirs.« less