China University of Petroleum

Cnpc Engineering Technology R&d Company Limited

Cnpc Chuanqing Drilling Engineering Company Limited

Jiansheng Luo

Guancheng Jiang

Yinbo He

Lili Yang

Tengfei Dong

Bin Tan

Rongchao Cheng

Jianguo Zhang

Tie Geng

Xin Zhang

Kai Wang

Yong Wang

Li Li Zhao

Jinsheng Sun

Xiaobo Liu

Chunyao Peng

Xuwu Luo

Kaixiao Cui

Xiaoxiao Ni

Xing Liang

He Shi

Xiaohu Luo

Wuquan Li

Xiaoqing Li

Chunlin Xie

Daqi Fu

Dongmin Jia

Changwei Chen

Qifa Ran

The present invention relates to the field of petroleum industry phase oilfield chemistry, and specifically relates to a bionic and dual-phobic drilling fluid. The drilling fluid contains a bionic wall-fixing agent, a bionic lubricant, a super dual-phobic agent, a scrap-carrying agent and a bionic shale inhibitor. The present invention uses the theory of bionics and the theory of a downhole rock surface being double phobic as a basis. By means of using the bionic wall-fixing agent, the bionic lubricant, the super dual-phobic agent, the scrap-carrying agent and the bionic shale inhibitor, which have special properties of imitating animals and plants in nature, and using a series of bionic treatment agents, a set of bionic and dual-phobic drilling fluid systems, which corresponds to an unconventional, complex oil and gas well, is formed.

Bionic and dual-phobic high-performance water-based drilling fluid

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.

Amphiphilic block polymer ultralow-permeability agent and intelligent temporary plugging type water-based drilling fluid

Growing community of inventors

Beijing, China

Jiansheng Luo