油管聚乙烯内衬在高温高压H_(2)S环境中的适用性  

Applicability of Polyethylene Liner of Oil Pipe in High Temperature and High Pressure H_(2)S Environment

作　　者：陈伟[1,2] 肖雯雯[1,2] 许艳艳[1,2] CHEN Wei;XIAO Wenwen;XU Yanyan(Sinopec Northwest Company of China Petroleum and Chemical Corporation,Urumqi 830011,China;Sinopec Key Laboratory of Enhanced Oil Recovery for Fractured Vuggy Reservoirs,Urumqi 830011,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,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

出　　处：《腐蚀与防护》2022年第3期62-67,共6页Corrosion & Protection

摘　　要：模拟塔河油田现场工况对油管用聚乙烯内衬材料进行了不同温度的室内腐蚀试验,考察了聚乙烯在高温高压H_(2)S环境中的性能变化,并通过现场试验进行了验证。结果表明:聚乙烯内衬可以应用在井下温度不超过80℃的工况,超过80℃则会出现严重的开裂失效问题,主要原因为高温和氧分子的存在,造成聚乙烯材料的热氧化老化,聚乙烯分子在热的作用下发生裂解、交联和脱氢碳化,造成龟裂、粉化或收缩变形失效。Indoor corrosion tests simulating the field working conditions of Tahe Oilfield were carried out on polyethylene liner materials for oil pipe at different temperatures to investigate the performance changes of polyethylene in a high temperature high pressure H_(2)S environment,which were verified by field tests.The results show that polyethylene liner could be used in downhole working conditions below 80℃,and serious cracking failure occurred when the temperature was above 80℃.The main reason for cracking failure was the thermal oxidation aging of polyethylene because of high temperature and oxygen molecule.Polyethylene molecules underwent cracking,crosslinking and dehydrogenation and carbonization under the action of heat,resulting in cracking,pulverization or shrinkage deformation failure.

关 键 词：聚乙烯内衬 油管 高温高压 

分 类 号：TG174[金属学及工艺—金属表面处理]