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. 07, 2014
Filed:
Sep. 23, 2011
Xiaohua Yang, Beijing, CN;
Lin Wang, Beijing, CN;
Jiafen LI, Beijing, CN;
Xiaolin Qian, Beijing, CN;
Xianguang Wang, Beijing, CN;
Sheng LI, Beijing, CN;
Liwei Ren, Beijing, CN;
Changming Su, Beijing, CN;
Zhifa Wang, Beijing, CN;
Guichuan Liu, Beijing, CN;
Bingzhong Shi, Beijing, CN;
Xiaohua Yang, Beijing, CN;
Lin Wang, Beijing, CN;
Jiafen Li, Beijing, CN;
Xiaolin Qian, Beijing, CN;
Xianguang Wang, Beijing, CN;
Sheng Li, Beijing, CN;
Liwei Ren, Beijing, CN;
Changming Su, Beijing, CN;
Zhifa Wang, Beijing, CN;
Guichuan Liu, Beijing, CN;
Bingzhong Shi, Beijing, CN;
China Petroleum & Chemical Corporation, Beijing, CN;
Sinopec Research Institute of Petroleum Engineering, Beijing, CN;
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.