Development and performance evaluation of a high temperature resistant, internal rigid, and external flexible plugging agent for water-based drilling fluids

作     者：Zhe Xu Jinsheng Sun Li Li Kaihe Lv Jingping Liu Zhiwen Dai Xianfa Zhang Zonglun Wang 

作者机构：School of Petroleum EngineeringChina University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company LimitedChangping10206China Oil&Gas Technology Research Institute of Changqing Oilfield CompanyXi'an710000China 

出 版 物：《Petroleum》 (油气（英文）)

年 卷 期：2023年第9卷第1期

页      面：33-40页

核心收录：

学科分类：0820[工学-石油与天然气工程] 082001[工学-油气井工程] 08[工学] 

基　　金：Natural Science Foundation of China(Grants 51904328) 

主　　题：Internal rigidity External flexibility Plugging agent Filter loss reduction Plugging performance 

摘      要：During the drilling process for oil and gas production,a larger number of drilling fluids invade the formation,causing severe formation damage and wellbore collapsing,which seriously hinders the efficient production of deep oil and *** several plugging agents have been developed for efficient fracture sealing in recent years,the development of high-performance plugging agents with self-adaptive ability and high-temperature resistance remain a ***,we report the synthesis of an internal rigid and external flexible plugging agent PANS by reversed-phase emulsion polymerization with nano-silica as the rigid core and poly(acrylamide-co-N-vinylpyrrolidone)as a flexible *** plugging agent has a median particle size of 10.5μm and can self-adapt to seal the microfractures and fractures in the formation,leading to an effective reduction in the filtration loss of bentonite water-based drilling fluid under both low temperature and low pressure(LTLP)and high temperature and high pressure(HTHP)*** addition,compared with the neat nano-silica(500 nm),the sealing efficiency of PANS toward 100–120 mesh sand bed was increased by 71.4%after hot rolling at 180°C.