Abstract

Summary The U.S. DOE Morgantown Energy Technology Center and the Pennzoil E&P Co. predicted the recovery and economic potential of a full-field, CO2 miscible EOR flood at the Rock Creek field, Roane County, WV. Data used in this evaluation were obtained from two miscible CO2 Rock Creek field tests: (1) a pilot test consisting of two contiguous normal five-spot patterns, each containing 10 acres [4 ha], and (2) a 1.55-acre [0.63-ha] normal four-spot minitest. Core data from the eight injection wells and three observation wells were used to determine reservoir input parameters, and fluid samples were analyzed to obtain fluid properties. A predictive model was used to calculate oil recovery and project economics. The model’s base-case run showed that an oil price of $39/bbl [$245/m3] was required to produce a 15% discounted cash flow rate of return (DCF ROR). A sensitivity study was then conducted on operating parameters [i.e., pattern size, water-alternating-gas (WAG) ratio, total HCPV of WAG injected, and injection rate] and economic parameters (e.g., oil price and CO2 cost) to determine their effect on project performance and project economics.

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