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

US10544353B2 · kind B2 · utility

Assignee

• PetroChina Company Limited · CN

Inventors

• Gang Guo · Bositenghu, CN
• Zhongxing Li · Tangxia, CN
• Lijun Mu · Beijing, CN
• Zhenfeng Zhao · Beijing, CN
• Kuangsheng Zhang · Beijing, CN
• Xiaojia Xue · Beijing, CN
• Jiang Wu · Longbeilingcun, CN
• Kai Li · Princeton, US
• Huabo Fan · Beijing, CN
• Jin Liu · Beijing, CN
• Xiaoqun Zhou · Singapore, SG
• Cheng Xian · Beijing, CN

Key dates

• Filing date: Apr 18, 2018
• Grant date: Jan 28, 2020
• Expiry date: Apr 18, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2208/30
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.