The Illinois and Appalachian Basins contain many mature and economically marginal waterfloods. These fields produce at high water-oil ratios that have proportional fluid handling costs. Approximately 60% of the oil resource remains in the reservoir rock at these conditions. The Alkaline-Surfactant-Polymer, ASP, technology has been field demonstrated to recover 15% OOIP to 30% OOIP of this residual oil by minimizing capillary forces which trap oil, improving areal and vertical contact efficiency, and mobility ratio. Mechanisms of ASP flooding are discussed and field performance is compared with micellar technologies that were tested in the Illinois Basin.

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