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:
Aug. 01, 2017
Filed:
Dec. 15, 2015
China Petroleum & Chemical Corporation, Beijing, CN;
Fushun Research Institute of Petroleum and Petrochemicals, Sinopec Corp., Fushun, Liaoning, CN;
Chao Yang, Liaoning, CN;
Zhizhi Zhang, Liaoning, CN;
Xiaolei Sun, Liaoning, CN;
Jiao Lu, Liaoning, CN;
Zequn Yin, Liaoning, CN;
Quanjie Liu, Liaoning, CN;
CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing, CN;
FUSHUN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC CORP., Fushun, Liaoning, CN;
Abstract
Disclosed are an associated copolymer, a method for preparation of a polymer and a polymer prepared with the method, a use of the associated copolymer and/or the polymer in drilling fluids, and a drilling fluid containing the associated copolymer and/or the polymer. The associated copolymer comprises acrylamide structural units, zwitter-ionic structural units, and cationic polyamine structural units at a specific proportion, and the cationic polyamine structural units have specific kinematic viscosity and cationic degree; thus, when the associated copolymer is used as a viscosity improver for drilling fluids, the obtained drilling fluid not only has favorable apparent viscosity after it is aged at a high temperature, but also has high dynamic shear force, and is resistant to high temperature up to 200° C. or above, resistant to NaCl up to saturated concentration, and resistant to CaClup to 20 wt % concentration.