A carbon dioxide (CO2) injection project has been underway at the Dollarhide Devonian Unit since May 1985. Through August 1987, 5.8% hydrocarbon pore volume (HCPV) of single slug CO2 had been injected into the Unit's Phase I CO2 area with very little breakthrough at producers. Dollarhide's total lack of premature breakthrough is unique among West Texas CO2 floods and is indicative of unusually high CO2 sweep efficiency. Through pattern realignment and injection of a 30% HCPV of CO2, the project is expected to recover 19% original oil in place (OOΙΡ), or 26.3 MMSTB.

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