The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 2020
Filed:
Apr. 18, 2018
Petrochina Company Limited, Beijing, CN;
Gang Guo, Beijing, CN;
Zhongxing Li, Beijing, CN;
Lijun Mu, Beijing, CN;
Zhenfeng Zhao, Beijing, CN;
Kuangsheng Zhang, Beijing, CN;
Xiaojia Xue, Beijing, CN;
Jiang Wu, Beijing, CN;
Kai Li, Beijing, CN;
Huabo Fan, Beijing, CN;
Jin Liu, Beijing, CN;
Xiaoqun Zhou, Beijing, CN;
Cheng Xian, Beijing, CN;
PetroChina Company Ltd., , CN;
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.