Copolymer and preparation method and application thereof

US8623791B2 · kind B2 · utility

Assignees

• CHINA PETROLEUM & CHEMICAL CORPORATION · CN
• SINOPEC RESEARCH INSTITUTE OF PETROLEUM ENGINEERING · CN

Inventors

• Xiaohua Yang · Shanghai, CN
• Lin Wang · Qingdao, CN
• Jiafen Li · Beijing, CN
• Xiaolin Qian · Tianjin, CN
• Xianguang Wang · Beijing, CN
• Sheng Li · Elmore, AU
• Liwei Ren · Beijing, CN
• Changming Su · Beijing, CN
• Zhifa Wang · Beijing, CN
• Guichuan Liu · Beijing, CN
• Bingzhong Shi · Beijing, CN

Key dates

• Filing date: Sep 23, 2011
• Grant date: Jan 7, 2014
• Expiry date: Sep 23, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A copolymer and preparation method and application thereof are disclosed. The copolymer is random copolymer obtained from monomers consisting of acrylamide, acrylic acid, alkenyl sulfonate, 2-acrylamido-dodecyl sulfonate, p-styrene sulfonate or isoprene sulfonate and so on. The copolymer of present invention can be used as fluid loss additive and has good fluid loss properties, which would not make the drilling fluid thicken at high temperature of 200° C. and high salt conditions of saturated brine. It has a medium-pressure fluid loss after aging and rolling for 16 h at high temperature of 200° C., as measured in accordance with the American Petroleum Institute Standard Test at room temperature, and has good properties of high temperature-resisting and salt-resisting.