The success of a CO2 flood largely depends on the quality of its injection wells. The wells must confine injection to the desired pay intervals and withstand the corrosive nature of CO2 for the life of the flood. These are difficult goals to achieve considering the primary candidates for CO2 flooding are mature waterfloods where the wells may have been in service for forty years or more. Casing and cementing practices of the past were often inadequate for a long waterflood life, and are certainly unacceptable for a long term tertiary recovery project.

This paper describes innovative techniques employed in the MCA Unit, located in southeast New Mexico, for converting old waterflood injection wells into state-of-the-art CO2 injection wells. The solutions developed for the MCA CO2 Project have considerable application to other CO2 projects and can be profitably employed to improve waterflood recovery as well.

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