Abstract
AbstractThe surfactant solution not only has the ability to reduce the interfacial tension between the oil-displacing agent and the crude oil, but also has the performance of emulsification and oil-displacing. The use of surfactant flooding in high water-cut oil fields to further improve oil recovery is a relatively common method of tertiary oil recovery at present. Core flooding experiments show that after water flooding in low-viscosity sandstone reservoirs, the oil-increasing and precipitation effects of integral surfactant flooding are not significant. After low-speed water flooding, the lower the surfactant interfacial tension, the higher the oil displacement efficiency. After high-speed water flooding, the surfactant interfacial tension has no significant effect on the improvement of oil displacement efficiency. Therefore, after high-speed water flooding in low-viscosity sandstone reservoirs, the potential for enhancing oil recovery through surfactant flooding is very limited.KeywordsLow-viscosity sandstone reservoirsHigh water cutHigh-speed water floodingSurfactant floodingDisplacement efficiency
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