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:
Feb. 14, 2023
Filed:
Mar. 16, 2022
China University of Petroleum (Beijing), Beijing, CN;
Yinbo He, Beijing, CN;
Guancheng Jiang, Beijing, CN;
Lili Yang, Beijing, CN;
Tengfei Dong, Beijing, CN;
Bin Tan, Beijing, CN;
Rongchao Cheng, Beijing, CN;
He Shi, Beijing, CN;
Jianguo Zhang, Beijing, CN;
Tie Geng, Beijing, CN;
Jiansheng Luo, Beijing, CN;
Dongmin Jia, Beijing, CN;
Kai Wang, Beijing, CN;
Chunlin Xie, Beijing, CN;
Wuquan Li, Beijing, CN;
Xiaoqing Li, Beijing, CN;
China University of Petroleum (Beijing), Beijing, CN;
Abstract
The invention relates to the technical field of oil and gas drilling, and discloses an amphiphilic block polymer ultralow-permeability agent and an intelligent temporary plugging type water-based drilling fluid. The ultralow-permeability agent contains a structural unit provided by styryl hydrophobic monomer, maleic anhydride and acrylamide; the drilling fluid contains two or more of water, sodium bentonite, Pac-Lv, the ultralow-permeability agent, calcium carbonate, one-way plugging agent, white asphalt and barite which are stored in a mixed manner or independently stored. When the amphiphilic block polymer provided by the invention is used as the ultralow-permeability agent of the intelligent temporary plugging type water-based drilling fluid, the self-adaptive characteristic is realized; according to the amphiphilic block polymer, temporary plugging layer gaps formed in pore and throats by plugging materials in drilling fluid can be fully filled under the condition that the sizes and the distribution of the pore and throats of reservoirs are not required to be clear, so that the permeability of temporary plugging layer is greatly reduced, ultralow-permeability is realized, and the amphiphilic block polymer is weak in tackifying effect, has gel-improving effect and can improve the rheological property of the drilling fluid.