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Polymer flood gains expansive popularity as a promising EOR method in various oilfields worldwide. How- ever, there are still substantial amount of resources underground after polymer application. To further enhance oil recov- ery, secondary chemicals are sometimes utilized to sweep the remaining hydrocarbons to maintain the consistent devel- opment of oilfields. In this paper, a series of experiments are established and conducted to explore the feasibility of sur- factant/polymer flooding applied to a polymer flooded reservoir, and also the influence of polymer retention in porous media to enhance the oil recovery performance of subsequent chemical drive. The data of the experiments suggest that surfactant/polymer flooding owns a very good potential as a subsequent EOR technique, and that polymer retention in pores helps block underground water channels, improving greatly the sweeping efficiency of secondary chemical flood.

Study on the Impact of Polymer Retention in Porous Media on Further Surfactant-Polymer Flood