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:
Sep. 15, 2020
Filed:
Sep. 12, 2018
China Petroleum & Chemical Corporation, Beijing, CN;
Sinopec Research Institute of Petroleum Engineering, Beijing, CN;
Yongxue Lin, Beijing, CN;
Xiaohua Yang, Beijing, CN;
Lin Wang, Beijing, CN;
Jian He, Beijing, CN;
Junbin Jin, Beijing, CN;
Fan Yang, Beijing, CN;
Haibo Wang, Beijing, CN;
CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing, CN;
SINOPEC RESEARCH INSTITUTE OF PETROLEUM ENGINEERING, Bejing, CN;
Abstract
A random copolymer, a preparation method of the random copolymer, a drilling fluid containing the random copolymer. The random copolymer contains structural unit (A) represented by formula (1), structural unit (B) represented by formula (2), structural unit (C) represented by formula (3), and structural unit (D) represented by formula (4) or (5): wherein X is halogen. When the random copolymer is used as a filter loss reducer in a high-calcium drilling fluid, the filter loss of the high-calcium drilling fluid can be reduced.