Petrochina Company Limited

Xiaojia Xue

Jin Liu

Kai Lin Li

Jiang Wu

Lijun Mu

Zhenfeng Zhao

Gang Guo

Zhongxing Li

Huabo Fan

Xiaoqun Zhou

Cheng Xian

Kuangsheng Zhang

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.

Surfactant that changes the wettability of tight sandstone and its preparation method and application

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Beijing, China

Xiaojia Xue