In order to implement a CO2 flood in the North Dollarhide (Devonian) Unit (NDU), detailed reservoir characterization and engineering studies were prepared using 3-D seismic, classical geology and reservoir engineering, and a fieldwide reservoir simulation. Routine and special core analyses, PVT analyses, and well tests taken during recent development aided in the reservoir and fluid characterizations. A black oil reservoir model matched available production and pressure history of the reservoir, and forecasted future production under water injection and CO2 injection using mixing rules developed with the aid of a 1/4 5-spot compositional model. History matching presented a special challenge since Devonian and uphole Clearfork production was commingled between late 1970 and 1990, and therefore actual Devonian production and pressures were not implicitly known.

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