Abstract
Polymer flood gains expansive popularity as a promising EOR method in various oilfields worldwide. However, there are still substantial amount of resources underground after polymer application. To further enhance oil recovery, secondary chemicals are sometimes utilized to sweep the remaining hydrocarbons to maintain the consistent development of oilfields. In this paper, a series of experiments are established and conducted to explore the feasibility of surfactant/ 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.
Highlights
Polymer flood can effectively enhance oil recovery by improving sweeping and flooding efficiency, making it a promising and widely-applied EOR method both at home and abroad
It originally derives from alkalisurfactant-polymer flooding technique (ASP) and excludes the existence of alkali, without derogating too much the comprehensive EOR advances of the combination drive [3]
Polymer flood served as a strong EOR technique can produce remarkable amount of oil
Summary
Polymer flood can effectively enhance oil recovery by improving sweeping and flooding efficiency, making it a promising and widely-applied EOR method both at home and abroad. In another set of experiment, we separately injected surfactant solution with concentration 0.1%, 0.2%, 0.3%, 0.4% under the conditions of different residual polymer after polymer flooding, and analyze its dynamic adsorption and retention law under the existence of residual polymer. Surfactant/polymer flooding technique is applied to each model until water cut reaches 98% for further enhanced oil recovery process.
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