Salt-tolerant polymer microsphere plugging agent and preparation method thereof

US11629282B2 · kind B2 · utility

Assignee

• SHAANXI UNIVERSITY OF SCIENCE AND TECHNOLOGY · CN

Inventors

• Xiaojuan Lai · Xi'an, CN
• Guiru Liu · Xi'an, CN
• Lei Wang · Shanghai, CN
• Jinhao Gao · Xi'an, CN
• Xiaohu Liu · Shanghai, CN
• Zhiqiang Dang · Xi'an, CN
• Chu Mi · Xi'an, CN
• Jun Yin · Sichuan, CN

Key dates

• Filing date: Aug 12, 2021
• Grant date: Apr 18, 2023
• Expiry date: Aug 12, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/508
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A salt-tolerant polymer microsphere plugging agent and a preparation method thereof, the agent being made of white oil, fumed silica, acrylamide monomer, acrylic acid, sorbitan fatty acid ester, N,N′-methylene bisacrylamide, ammonium persulfate, sodium bisulfite, hydrophilic surfactant and water. The present general inventive concept synthesizes salt-tolerant polymer microspheres with ultra-low interfacial tension by adopting inverse phase emulsion polymerization. The prepared polymer microsphere plugging agent is a new type of polymer microspheres with ultra-low interfacial tension, such that the tension can reach 4.3×10−3 mN/m, and the salt tolerance can reach 50000 mg/L salinity, which improves the problem of low interfacial tension and poor salt tolerance in existing polymer microspheres.