Abstract

This report summarizes data produced as part of a U.S. Department of Energy (DOE) project to evaluate methods for improving waterflood response in the Upper Cretaceous D sandstone of the Denver basin. Historically poor performance of waterflooding in this widespread reservoir has meant total recoveries averaging less than 20% of original oil in place (OOIP), with considerable variation in local sweep efficiency. Detailed reservoir characterization of the D sandstone in the Sooner unit, integrating well-log, core, seismic, and engineering data, resulted in an updated reservoir model that included delineation of multiple reservoir compartments. This model was used as a basis for a field redevelopment plan whose initial stage involved realigning existing injectors/producers and drilling several infill locations to increase sweep efficiency on a compartment-by-compartment basis. Results of implementation included a 100% increase in daily unit production, an increase in proven reserves of 696,000 bbl oil equivalent to more than 10% of OOIP. On the basis of these results, ultimate recovery from the unit, with implementation of selective infill drilling, is projected at 32.6% OOIP. Success of the project suggests that similar programs might yield significant economic benefits in other D sandstone fields.

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