压差激活密封剂的制备与应用  

Preparation and Application of Pressure Activated Sealant

作　　者：蒋孟晨 许林 程现华 李冬 黄美兰 高君 闻扬 王佳明 JIANG Mengchen;XU Lin;CHENG Xianhua;LI Dong;HUANG Meilan;GAO Jun;WEN Yang;WANG Jiaming(School of Petrochemical Engineering and Environment,Zhejiang Ocean University,Zhoushan,Zhejiang 316022,P R of China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing,102249,P R of China;CNPC Logging,Xinjiang Branch,Karamay,Xinjiang 834000,P R of China;CNOOC(China)Company,Ltd,Shanghai Branch,Shanghai 315000,P R of China;School of Chemistry and Chemical Engineering,Queen’s University Belfast,Belfast,BT95AG,United Kingdom)

机构地区：[1]浙江海洋大学石油化工与环境学院,浙江舟山316022 [2]中国石油大学(北京)石油工程学院,北京102249 [3]中国石油测井公司新疆分公司,新疆克拉玛依834000 [4]中海石油(中国)有限公司上海分公司,上海315000 [5]贝尔法斯特女王大学化学化工学院,贝尔法斯特BT95AG,英国

出　　处：《油田化学》2021年第2期216-222,共7页Oilfield Chemistry

基　　金：浙江省基础工艺研究项目“海洋油气开发微泄漏压差激活密封剂及其自适应修复机理研究”(项目编号LGG20E040002);浙江省教育厅一般项目“新型压差激活密封剂的微缺陷自适应修复行为研究”(项目编号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”(项目编号2019C21006);浙江海洋大学创新计划项目“油气管线自适应堵漏剂及作用机理”(项目编号XJ2018082)。

摘　　要：为满足油气井密封损伤快速、经济、安全修复的要求,以羧基丁腈胶乳、黄原胶、MgCl2和烷基酚聚氧乙烯醚为原料制备了一种新型压差激活密封剂,通过激光粒度分析仪和超景深三维显微系统分析了密封剂的微观形貌,通过自制的动态堵漏评价设备考察了密封剂的动态堵漏性能,分析了该密封流体的压差激活封堵机理,并在海上G2气田进行了现场应用。结果表明,制备的压差激活密封剂是一种多分散相体系,分散相为复合液滴,胶粒呈规则球状,平均粒径为261.5μm;在15 MPa内可对丝扣、裂缝等不同微泄漏形成良好封堵,封堵性随温度升高而增强。构建的力学-化学耦合新模型表明,复合液滴在漏点压差流场内去水化激活中心粒子,活性粒子聚结填充泄漏孔隙,实现自适应封堵。该压差激活密封剂在海上环空带压井进行了泄漏修复应用,效果良好。图10参28。In order to meet the rapid,economical,and safe requirments of seal repair in oil and gas wells,a unique pressure activated sealant(PAS)was prepared with carboxylated acrylonitrile butadiene rubber latex(XNBRL),xanthan gum,MgCl2 and alkylphenol ethoxylates.Morphology characterization of sealant particulate was implemented by laser particle size analyzer and microscopic system with super depth of field.The sealing property was studied using a specially designed dynamic sealing detector,the mechanism of pressure activated seal was analyzed,and the field trial was conducted in G2 offshore gas well.The results showed that the prepared PAS was a kind of polydisperse fluid,wherein the solid particles were regular complex droplets with an average size of 261.5μm.PAS could effectively plug the leaks,e.g.thread and crack under 15 MPa differential pressure,and the sealing capability reinforced with the increase of temperature.The newly developed mechano-chemical coupling model revealed that the complex droplets could be activated by dehydrition effect caused by the differential pressure of leakages,followed by aggregation and fill of active particulates in leak geometry that led to the self-adaptive sealing property.Field trial was further carried out to validate PAS’s application of tubing leak repair in a certain offshore gas well with a sustained casing pressure.

关 键 词：压差激活密封剂 多分散相流体 微结构 自适应封堵 力学-化学耦合模型 泄漏修复 

分 类 号：TE258[石油与天然气工程—油气井工程]