A novel responsive stabilizing Janus nanosilica as a nanoplugging agent in water-based drilling fluids for exploiting hostile shale environments  

作　　者：Alain Pierre Tchameni Lv-Yan Zhuo Lesly Dasilva Wandji Djouonkep Robert Dery Nagre Lu-Xin Chen Lin Zhao Chao Ma Bin-Qiang Xie 

机构地区：[1]College of Petroleum Engineering,Yangtze University,Wuhan,430100,Hubei,China [2]Key Laboratory of Drilling and Production Engineering for Oil and Gas,Hubei,China [3]Lost Circulation Control Laboratory,National Engineering Laboratory for Petroleum Drilling Engineering,Yangtze University,Wuhan,430100,Hubei,China [4]College of Petroleum Engineering,Shandong Institute of Petroleum and Chemical Technology,Dongying,257061,Shandong,China [5]Petroleum Engineer Research Institute of Petrochina Dagang Oilfield,Tianjin,300280,China [6]Department of Chemical Engineering,Kumasi Technical University,P.O.Box 854,Kumasi,Ghana

出　　处：《Petroleum Science》2024年第2期1190-1210,共21页石油科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.52150410427);the Key Support Program for Foreign Experts of the Ministry of Science and Technology of the People's Republic of China(No.wgxz2022057);funding for post-doctoral work by the Department of Human Resources and Social Security of Hubei Province。

摘　　要：Thermo-responsive nanocomposites have recently emerged as potential nanoplugging agents for shale stabilization in high-temperature water-based drilling fluids(WBDFs). However, their inhibitory properties have not been very effective in high-temperature drilling operations. Thermo-responsive Janus nanocomposites are expected to strongly interact with clay particles from the inward hemisphere of nanomaterials, which drive the establishment of a tighter hydrophobic membrane over the shale surface at the outward hemisphere under geothermal conditions for shale stabilization. This work combines the synergistic benefits of thermo-responsive and zwitterionic nanomaterials to synchronously enhance the chemical inhibitions and plugging performances in shale under harsh conditions. A novel thermoresponsive Janus nanosilica(TRJS) exhibiting zwitterionic character was synthesized, characterized,and assessed as shale stabilizer for WBDFs at high temperatures. Compared to pristine nanosilica(Si NP)and symmetrical thermo-responsive nanosilica(TRS), TRJS exhibited anti-polyelectrolyte behaviour, in which electrolyte ions screened the electrostatic attraction between the charged particles, potentially stabilizing nanomaterial in hostile shaly environments(i.e., up to saturated brine or API brine). Macroscopically, TRJS exhibited higher chemical inhibition than Si NP and TRS in brine, prompting a better capability to control pressure penetration. TRJS adsorbed onto the clay surface via chemisorption and hydrogen bonding, and the interactions became substantial in brine, according to the results of electrophoretic mobility, surface wettability, and X-ray diffraction. Thus, contributing to the firm trapping of TRJS into the nanopore structure of the shale, triggering the formation of a tight hydrophobic membrane over the shale surface from the outward hemisphere. The addition of TRJS into WBDF had no deleterious effect on fluid properties after hot-treatment at 190℃, implying that TRJS could find potential use as a shale stabiliz

关 键 词：Janus nanosilica Thermo-responsive copolymer Anti-polyelectrolyte effect Shale stabilizer Inhibition Plugging Drilling fluid 

分 类 号：TE254.4[石油与天然气工程—油气井工程]