新疆克深2气田双金属复合管失效原因  

Failure cause of bi-metal composite pipe of Xinjiang No.2 Keshen Gasfield

作　　者：许爱华[1] 张靖[1] 院振刚[1] 邹应勇[1] 崔兰德[1] 舒丹[1] 

机构地区：[1]中国石油塔里木油田公司,新疆库尔勒841000

出　　处：《油气储运》2014年第9期1024-1028,共5页Oil & Gas Storage and Transportation

基　　金：中国石油天然气集团公司产能建设项目"克深2气田地面建设工程";油勘字2012-117

摘　　要：新疆克深2气田双金属复合管应用中出现了焊口开裂、延迟裂纹、打压刺漏和投产后刺漏等问题,造成很大经济损失。对复合管失效的各种原因进行深入调查,并进行实验室测试和理论分析,认为焊缝Ni、Cr元素稀释造成填充层盖面层硬度超高,韧性变差,止裂能力变弱等为本次复合管焊接失效的直接原因,部分跨河入地弹性敷设段,在冬季施工后管道收缩使焊口高硬度区承受较大弯曲应力导致复合管失效。根据调查分析结果,提出了新的焊接工艺,解决了复合管失效问题,并对复合管设计、生产制造、焊接工艺、现场施工提出了建议。The bi-metal composite pipe used at Xinjiang No.2 Keshen Gasfield, exhibited cracking of welded joints, delayed crack, pressure washout, post-commissioning washout and other problems during service, causing significant economic losses. A thorough investigation into the various causes of the composite pipe failure was conducted, and laboratory experiments as well as theoretical analyses were carried out. It is considered that the direct cause of this instance of composite pipe welding failure was the dilution of the elements Ni and Cr in the weld seams, which led to excessive hardness of the cap in the filling layer, a deterioration of ductility, and a weakening of its capacity to prevent cracking. After winter construction, some of the pipe sections with elastic laying in river crossing experienced contraction, which led to areas of increased hardness on the welded joints experiencing greater bending stress, thus causing composite pipe failure. Based on the analysis results, the authors suggest a new welding technique to solve the problem of composite pipe failure, and put forward suggestions regarding composite pipe design and manufacture, welding techniques, and on-site construction. （5 Figures, 4 Tables, 6 References）

关 键 词：双金属复合管 裂纹 失效 工艺评定 

分 类 号：TE832[石油与天然气工程—油气储运工程]