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Mechanism of surfactant flooding in low-permeability oiltields
GAO Feng1,SONG Zhao-zheng2
(1. College of Petroleum Engineering in China University of Petroleum, Beijing 102249,China;2. State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Beijing 102249, China)
Abstract:
Based on the theories of decreasing threshold pressure and combined wilh experiments of the effect of surfactant solution on relative permeability, the mechanisms of decreasing pressure and increasing injection rate by surfactant were researched. The results show that the surfactant solution can reduce oil-water interfacial tension, increase oil flow capacity, change wettability of rock surface from oil-wet to water-wet, decrease capillary resistance of water drive, increase water-phase permeability and decrease injection pressure. The oil displacement effect is preferable when the r lution is 0. 2%,injection rate is 0. 5Fp( is pore volume),and the water cut is lower than 70%.
Key words:  low-permeability oilfields  ment mechanism threshold pressure  surfactant  injection f  interfacial toil displace-