Calfee Halter & Griswold LLP
Calcium-resistant zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing polymer as dispersant
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.
China University of Petroleum (Beijing)
C C C C C
C09K C08F C08F C08F C08F
inventional additional inventional inventional inventional
Li Xianbin Lili Haiyang Wuquan Jingen Tengfei Xiaoqing Guancheng Xuwu Jingping Yinbo
Zhao Huang Yang Liu Li Deng Dong Li Jiang Luo Liu He