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:
Jun. 15, 2021
Filed:
Jan. 20, 2021
China University of Petroleum (Beijing), Beijing, CN;
Yinbo He, Beijing, CN;
Guancheng Jiang, Beijing, CN;
Tengfei Dong, Beijing, CN;
Lili Yang, Beijing, CN;
Wuquan Li, Beijing, CN;
Haiyang Liu, Beijing, CN;
Xiaoqing Li, Beijing, CN;
Xuwu Luo, Karamay, CN;
Li Zhao, Karamay, CN;
Xianbin Huang, Qingdao, CN;
Jingping Liu, Qingdao, CN;
Jingen Deng, Beijing, CN;
China University of Petroleum (Beijing), Beijing, CN;
Abstract
The invention discloses a calcium-resistant zwitterionic polymer, a preparation method and an application thereof, and a water-based drilling fluid containing the polymer as a dispersing agent, wherein the polymer contains a structural unit A, a structural unit B and a structural unit C, and the structural unit A is at least one selected from the group consisting of structural units with a structure shown in a formula (11), a structure shown in a formula (12) and a structure shown in a formula (13); the structural unit B is a structural unit with a structure shown in a formula (2); the structural unit C is at least one selected from the group consisting of structural units having a structure represented by formula (31) and a structure represented by formula (32); the weight-average molecular weight of the polymer is 350,000 to 600,000.