抗超高温水基钻井液用聚合物降滤失剂的研制  

Development of A Polymer Filter Loss Reducer for Ultra-High Temperature Water Base Drilling Fluids

作　　者：高伟 李银婷[1,2] 余福春 李双贵 毛惠 GAO Wei;LI Yinting;YU Fuchun;LI Shuanggui;MAO Hui(Petroleum Engineering Technology Research Institute,Sinopec Northwest Oilfield Company,Urumqi,Xinjiang 830011;Key Laboratory of Enhanced Recovery for Fracture-Cave Oil Reservoir,Sinopec,Urumqi,Xinjiang 830011;Tarim Branch of Petroleum Engineering Co.,Ltd.,Sinopec Shengli Oilfield Company,Korla,Xinjiang 841000;College of Energy Resources,Chengdu University of Technology,Chengdu,Sichuan 610059)

机构地区：[1]中国石油化工股份有限公司西北油田分公司工程技术研究院,乌鲁木齐830011 [2]中国石油化工集团公司碳酸盐岩缝洞型油藏提高采收率重点实验室,乌鲁木齐830011 [3]中石化胜利石油工程有限公司塔里木分公司,新疆库尔勒841000 [4]成都理工大学能源学院,成都610059

出　　处：《钻井液与完井液》2021年第2期146-151,157,共7页Drilling Fluid & Completion Fluid

基　　金：中国石化重点科技项目群“顺北特深层断裂破碎带区块安全成井关键技术”(PE19004);中国石化重点科技项目“顺北一区5号断裂带提质提速钻完井技术研究”(P20002)。

摘　　要：以丙烯酰胺、2-丙烯酰胺-2-甲基丙磺酸和甲基丙烯酸二甲氨基乙酯为聚合反应单体,以偶氮二异丁脒盐酸盐为引发剂,通过自由基聚合反应,室内研制出了一种新型水基钻井液用抗超高温聚合物降滤失剂CLG-240。借助红外光谱分析、凝胶色谱分析和热重分析,分别表征了降滤失剂CLG-240的分子结构,确定了合成产物的相对分子质量和热稳定性。综合评价了CLG-240在钻井液中的基本性能。结果表明,降滤失剂CLG-240的数均分子量约为6.461×10^(5),重均分子量约为7.345×10^(5);在室温~315℃范围内该聚合物的热失重总量约为26.5%,表明其自身便具有良好的抗温、耐温特性。室内研究表明,无论是在淡水实验浆还是在盐水实验浆中,降滤失剂CLG-240均具有较好的降滤失特性,同时还具有较好的泥页岩抑制特性;其在钻井液体系中具有良好的耐超高温性能,在低密度钻井液中的抗温能力达248℃,而在高密度钻井液中的抗温能力达220℃。A new polymer filter loss reducer CLG-240 was developed for use in water base drilling fluids in ultra-high temperature operations.CLG-240 was synthesized with acrylamide,2-acrylamide-2-methyl propane sulfonic acid and dimethylaminoethyl methacrylate as the monomers,and 2,2’-azobis[2-methylpropionamidine]dihydrochloride as the initiator through free radical polymerization.Using IR spectroscopy,gel chromatography analysis and thermogravimetric analysis,the molecular structure of CLG-240 was characterized and the relative molecular weight and thermal stability of the synthesized product determined.Comprehensive evaluation of the performance of CLG-240 in water base drilling fluids showed that CLG-240 has a number-average molecular weight of 6.461×10^(5),weight-average molecular weight of 7.345×10^(5).Total thermal loss of weight between room temperature and 315℃ is 26.5%,demonstrating that CLG-240 has good high temperature resistance and tolerance.Furthermore,CLG-240 showed good filtration control performance both in freshwater base drilling fluids and saltwater base drilling fluids,as well as good shale inhibitive capacity.Laboratory study showed that CLG-240 is resistant to ultra-high temperatures in drilling fluids;in low density drilling fluids,CLG-240 functions normally at temperature up to 248℃,while in high density drilling fluids,this temperature is 220℃.

关 键 词：水基钻井液 降滤失剂 聚合物 超高温 超深井 热稳定性 

分 类 号：TE254.4[石油与天然气工程—油气井工程]