Abstract
Abstract Horizontal wells were seen as a potential way to improve CO2 flood economics by increasing injection rate and improving areal sweep. The effect of horizontal injection wells on vertical sweep in a layered reservoir needed to be determined. Texaco planned to drill two horizontal CO2 injection wells as a pilot. Nearby observation wells would be used to monitor flow in the reservoir. More wells were planned as a result of a decision to not operate a CO2 flood in a densely populated area. Seven wells in the city of Sundown were plugged and abandoned. Three horizontal producers and one horizontal injector were drilled directionally from locations outside town to replace the plugged wells. This paper summarizes the planning, implementation, and post-drill analysis of these six wells. The seventh and eighth wells have recently been drilled and are mentioned briefly.
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