压差激活密封剂的制备、密封性能及机理研究  

A Differential Pressure Activated Sealant: Preparation, Sealing Performance and Working Mechanisms

作　　者：幸雪松[1] 许林 冯桓榰 刘书杰[1] 许明标[3] 陈侃 XING Xuesong;XU Lin;FENG Huanzhi;LIU Shujie;XU Mingbiao;CHEN Kan(Beijing Research Center of CNOOC(China)Co.,Ltd,Beijing 100028;College of Petrochemical and Energetic Engineering,Zhejiang Ocean University,Zhoushan,Zhejiang 316022;Hubei Collaborative Innovation Center for Unconventional Oil and Gas,Yangtze University,Wuhan,Hubei 430100;Jingzhou Jiahua Tech.Ltd.,Jingzhou,Hubei 434000)

机构地区：[1]中海石油(中国)有限公司北京研究中心,北京100028 [2]浙江海洋大学石化与能源学院,浙江舟山316022 [3]长江大学石油工程学院,武汉430100 [4]荆州嘉华科技有限公司,湖北荆州433100

出　　处：《钻井液与完井液》2019年第6期789-794,共6页Drilling Fluid & Completion Fluid

基　　金：“中海油井完整性技术体系研究(二期)—海上气井完整性检测与封堵技术研究”(YXKY-2017-ZY-09);浙江省教育厅一般科研项目“新型压差激活密封剂的微缺陷自适应修复行为研究”(Y201840431);舟山市科技计划项目“海洋油气井密封损伤的压力控释靶向修复技术研发”(2019C21006)

摘　　要：压差激活密封剂是一种具有自适应密封、施工简单、费用低等特点的新型密封体系,对于油气井管柱完整性的快速修复具有重要意义。笔者以羧基丁腈胶乳(XNBRL)、MgCl2、OP-10、VIS-B为原料,设计四因素四水平正交实验,考察了胶乳浓度、激活剂浓度、剪切速率、停搅时间对压差激活剂固相颗粒生长及微结构的影响,评价了压差激活剂的动态密封性能,分析了压差激活密封机理。结果表明,压差激活密封剂固相颗粒形貌规则,具有层级体型结构,粒径小于400μm;粒径生长影响顺序为:停搅时间>胶乳浓度>激活剂浓度>剪切速率;制备密封剂可在50℃、7.5 MPa压差下对0.5 mm×0.8 mm×10 mm微缺陷成功实施封堵;根据微粒形貌、分子聚集态结构及其射流场剪切形变行为,提出了密封流体在微缺陷压差作用下的液固转化力学-化学耦合构效模型,初步揭示了压差激活密封剂的自适应修复机理。Differential pressure activated sealant is a kind of sealant with self-adaptive sealing capacity.The application of this sealant is both easy and cost effective.It can be used to fast repair the integrity of oil and gas well strings.Four-factor four-level orthogonal experiment has been performed in laboratory with raw materials such as carboxylated butadiene-acrylonitrile latex(XNBRL),MgCl2,OP-10,VIS-B,to study the effects of the concentration of the latex,concentration of the activator,agitating time and rest time on the growth of the differential pressure activator particles and the microstructure of the activator.The dynamic sealing performance of the activator was evaluated and the differential pressure activated sealing mechanisms were analyzed.It was found that the morphology of the differential pressure activated sealant particles is regular,having a tiered spatial structure.The particle size of the sealant is less than 400μm.Factors affecting the growth of the particles are in the following order:rest time>concentration of the latex>concentration of the activator>shearing rate.The sealant prepared can successfully seal a microfracture of 0.5 mm×0.8 mm×10 mm at 50℃and 7.5 MPa.Based on the morphology of the particles,the molecular aggregation structure and the shear deformation behavior of the aggregated molecules,a physical-chemical coupling structure-activity model has been presented to describe the liquid-solid conversion behavior of sealing fluids under the differential pressure from microfractures.The model preliminarily reveals the selfadaptive reparation mechanisms of the differential pressure activated sealants.

关 键 词：压差激活密封剂 正交实验 微观分析 动态密封测试 自适应修复 

分 类 号：TE257.6[石油与天然气工程—油气井工程]