Calcium-resistant zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing polymer as dispersant

US11034876B1 · kind B1 · utility

Assignee

• China University of Petroleum—Beijing · CN

Inventors

• Yinbo He · Beijing, CN
• Guancheng Jiang · Beijing, CN
• Tengfei Dong · Beijing, CN
• Lili Yang · Pasadena, US
• Wuquan Li · Beijing, CN
• Haiyang Liu · Norman, US
• Xiaoqing Li · Newark, US
• Xuwu Luo · Karamay, CN
• Li Zhao · Beijing, CN
• Xianbin Huang · Qingdao, CN
• Jingping Liu · Beijing, CN
• Jingen Deng · Chengdu, CN

Key dates

• Filing date: Jan 20, 2021
• Grant date: Jun 15, 2021
• Expiry date: Jan 20, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2800/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention discloses a calcium-resistant zwitterionic polymer, a preparation method and an application thereof, and a water-based drilling fluid containing the polymer as a dispersing agent, wherein the polymer contains a structural unit A, a structural unit B and a structural unit C, and the structural unit A is at least one selected from the group consisting of structural units with a structure shown in a formula (11), a structure shown in a formula (12) and a structure shown in a formula (13); the structural unit B is a structural unit with a structure shown in a formula (2); the structural unit C is at least one selected from the group consisting of structural units having a structure represented by formula (31) and a structure represented by formula (32); the weight-average molecular weight of the polymer is 350,000 to 600,000.