US 11,787,990 B2
Bionic and dual-phobic high-performance water-based drilling fluid
Guancheng Jiang, Beijing (CN); Jinsheng Sun, Beijing (CN); Yinbo He, Beijing (CN); Xin Zhang, Beijing (CN); Chunyao Peng, Beijing (CN); Tengfei Dong, Beijing (CN); Bin Tan, Beijing (CN); Tie Geng, Beijing (CN); Lili Yang, Beijing (CN); Xiaohu Luo, Beijing (CN); Xuwu Luo, Karamay (CN); Xing Liang, Beijing (CN); Changwei Chen, Beijing (CN); Xiaobo Liu, Beijing (CN); Rongchao Cheng, Beijing (CN); Jiansheng Luo, Beijing (CN); Jianguo Zhang, Beijing (CN); Yong Wang, Beijing (CN); Daqi Fu, Beijing (CN); Qifa Ran, Chengdu (CN); Li Zhao, Karamay (CN); Kaixiao Cui, Beijing (CN); and Xiaoxiao Ni, Beijing (CN)
Assigned to China University of Petroleum (Beijing), Beijing (CN); CNPC Chuanqing Drilling Engineering Company Limited, Sichuan (CN); and CNPC Engineering Technology R&D Company Limited, Beijing (CN)
Filed by China University of Petroleum (Beijing), Beijing (CN); CNPC Chuanqing Drilling Engineering Company Limited, Chengdu (CN); and CNPC ENGINEERING TECHNOLOGY R&D COMPANY LIMITED, Beijing (CN)
Filed on Dec. 30, 2022, as Appl. No. 18/148,939.
Application 18/148,939 is a continuation of application No. PCT/CN2021/114849, filed on Aug. 26, 2021.
Claims priority of application No. 202010874082.8 (CN), filed on Aug. 26, 2020.
Prior Publication US 2023/0133053 A1, May 4, 2023
Int. Cl. C09K 8/16 (2006.01); C09K 8/24 (2006.01); C09K 8/20 (2006.01)
CPC C09K 8/24 (2013.01) [C09K 8/16 (2013.01); C09K 8/206 (2013.01); C09K 2208/10 (2013.01); C09K 2208/12 (2013.01); C09K 2208/34 (2013.01)] 19 Claims
 
1. A bionic and dual-phobic drilling fluid, wherein the drilling fluid comprising a bionic wall-fixing agent, a bionic lubricant, a super dual-phobic agent, a scrap-carrying agent and a bionic shale inhibitor;
the bionic wall-fixing agent is an acrylamide polymer containing a structural unit shown in a formula (1-a), a structural unit shown in a formula (2-a), a structural unit shown in a formula (3-a) and a structural unit shown in a formula (4-a), wherein the molar ratio of the structural unit shown in the formula (1-a), the structural unit shown in the formula (2-a), the structural unit shown in the formula (3-a) and the structural unit shown in the formula (4-a) is 1:(1.05-3):(0.5-0.95):(0.2-0.9);

OG Complex Work Unit Chemistry
wherein R1-R7, R10-R12 and R13-R15 are each independently selected from H and C1-C6 alkyl; R8-R9 and R16 are selected from alkyl groups of C1-C8; M is selected from H or alkali metal elements; L1 and L2 are each independently selected from the group consisting of C0-C6 alkylene;
the bionic lubricant is a block polymer, and the block polymer comprises a block A containing a carboxylic ester structural unit and a benzene-containing structural unit, and a block B containing an acrylamide structural unit connected with the block A; the benzene-containing structural unit is a structural unit shown in a formula (1-b); the carboxylic ester structural unit is one or more of structural units shown in formulas (2-b) and (3-b); the acrylamide structural unit is a structural unit shown in a formula (4-b);

OG Complex Work Unit Chemistry
wherein R1′-R2′, R4′-R6′, R8′-R10′ and R12′-R14′ are each independently selected from H and C1-C6 alkyl; L1′ is selected from C0-C6 alkylene; R7′ and R11′ are selected from C1-C8 alkyl; R15′ is selected from H, C1-C8 alkyl, -L2′-SOOM′, L2′ is selected from alkylene of C1-C6, and M′ is H or alkali metal element; R3′ is selected from H, C1-C6 alkyl, phenyl or phenyl-substituted alkyl of C1-C6;
the super dual-phobic agent is a modified carbon nanotube with a modifying group on the surface, wherein the modifying group comprises a modifying group provided by a silane coupling agent containing unsaturated carbon-carbon double bonds, perfluorosulfonyl halide represented by a formula R1SO2X and siloxane represented by a formula R3Si(OR2)3; wherein R1 is perfluoro-substituted alkyl of C4-C12, X represents halogen; R3 is selected from alkyl of C1-C6 and alkoxy of C1-C6, R2 is selected from alkyl of C1-C6;
the scrap-carrying agent is an Al2O3/SiO2 composite material, and the composite material comprises solid particles containing Al2O3 and SiO2, and a polyacrylamide polymer modified on the surfaces of the solid particles; wherein the polyacrylamide polymer contains structural units shown in a formula (1-c) and a formula (2-c):

OG Complex Work Unit Chemistry
wherein, R1″-R6″ are each independently selected from H or C1-C6 alkyl; L″ is selected from C0-C6 alkylene; R7″ is selected from C6-C20 alkyl substituted by halogen;
the bionic shale inhibitor is modified chitosan, and the modified chitosan is connected with a modifying group with a structure shown in a formula (1-d); formula (1-d): —CH2—CH(OH)CH2-polyamine structure; and the polyamine structure is provided by polyamine compounds.