Mature Waterfloods Renew Oil Production by Alkaline-Surfactant-Polymer Flooding

摘要

The Illinois and Appalachian Basins contain many mature andeconomically marginal waterfloods. These fields produce athigh water-oil ratios that have proportional fluid handlingcosts. Approximately 60% of the oil resource remains in thereservoir rock at these conditions. The Alkaline-Surfactant-Polymer, ASP, technology has been field demonstrated torecover 15% OOIP to 30% OOIP of this residual oil byminimizing capillary forces which trap oil, improving arealand vertical contact efficiency, and mobility ratio.Mechanisms of ASP flooding are discussed and fieldperformance is compared with micellar technologies that weretested in the Illinois Basin.