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公开(公告)号：US10544353B2
公开(公告)日：2020-01-28
申请号：US15956617
申请日：2018-04-18
Applicant: PetroChina Company Limited
Inventor： Gang Guo , Zhongxing Li , Lijun Mu , Zhenfeng Zhao , Kuangsheng Zhang , Xiaojia Xue , Jiang Wu , Kai Li , Huabo Fan , Jin Liu , Xiaoqun Zhou , Cheng Xian
Abstract: 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.
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2.发明申请公开(公告)号：US20190031945A1
公开(公告)日：2019-01-31
申请号：US15956617
申请日：2018-04-18
Applicant: PetroChina Company Limited
Inventor： Gang Guo , Zhongxing Li , Lijun Mu , Zhenfeng Zhao , Kuangsheng Zhang , Xiaojia Xue , Jiang Wu , Kai Li , Huabo Fan , Jin Liu , Xiaoqun Zhou , Cheng Xian
Abstract: 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.
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