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:
Jul. 25, 2018
China University of Geosciences, Beijing, Beijing, CN;
Zhihua Luo, Beijing, CN;
Xuesong Xing, Beijing, CN;
Peizhi Yu, Beijing, CN;
Yu Wang, Beijing, CN;
Bairu Xia, Beijing, CN;
Ziming Wang, Beijing, CN;
China University of Geosciences, Beijing, Beijing, CN;
Abstract
A star-shaped polyacrylamide copolymer and a preparation method thereof are provided, as well as a drilling fluid containing the star-shaped polyacrylamide copolymer. Only the star-shaped polyacrylamide copolymer is added into the drilling fluid; under a high-temperature environment, the filtration volume of the drilling fluid can be reduced, the high-temperature rheological property of the drilling fluid is improved, and the pressure loss of a circulation system of the drilling fluid is reduced.