Weaver Austin Villeneuve & Sampson LLP
Surfactant that changes the wettability of tight sandstone and its preparation method and application
A surfactant that changes the wettability of tight sandstone and its preparation method and application. By adding the aqueous phase solution into the oil phase solution, and under the action of the emulsifier, a uniformly dispersed phase is achieved. Then adding initiator, stirring and raising the temperature, reacting the reaction at the temperature to obtain a colorless and transparent liquid, i.e., high polymer. At room temperature, adding fluorocarbon surfactant and biosurfactant and stirring was continued for 4 hours to obtain a surfactant that changes the surface wettability of tight sandstone. The surfactant of the present invention can reduce the oil-water interfacial tension, transform the oil-wet surface into water-wet surface, which reduces the adhesion of oil droplets to rock surface and improves the flowability of crude oil in the original stratum, and improves the recovery of low-permeability reservoir.
PetroChina Company Ltd.
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inventional inventional additional inventional inventional inventional
Jin Kuangsheng Xiaoqun Jiang Huabo Lijun Gang Zhongxing Xiaojia Zhenfeng Kai Cheng
Liu Zhang Zhou Wu Fan Mu Guo Li Xue Zhao Li Xian