四川某页岩气管线环焊缝的失效原因
Failure Reason of Girth Welds in a Shale Gas Pipeline in Sichuan
陶诗平 1范宇 2张小涛 1朱文旭 1周长林 3文杰4
作者信息
- 1. 四川页岩气勘探开发有限责任公司,成都 610056
- 2. 西南油气田分公司工程技术研究院,成都 610017
- 3. 四川圣诺油气工程技术服务有限公司,广汉 618399
- 4. 成都劳恩普斯科技有限公司,成都 610023
- 折叠
摘要
四川某在役页岩气集气管线T接处发现多处焊缝裂纹.采用宏观形貌、微观组织、力学性能以及断口分析等方法对失效管件进行了系统分析,讨论了硫化物应力开裂、氢致延迟裂纹和应力腐蚀开裂的可能性并运用慢应变速率试验验证焊缝在含杀菌缓蚀剂环境中的应力腐蚀敏感性.结果显示:由于不同程度的焊接余高超标、焊瘤等缺陷和不等厚焊接,受腐蚀介质影响,该管线环焊缝开裂的主要原因是应力腐蚀,同时部分焊缝存在氢致延迟开裂现象.
Abstract
Multiple weld cracks were found at the T-joint of a shale gas gathering pipeline in service in Sichuan.A systematic analysis of failed pipe sections was conducted using methods such as macroscopy morphology,microstructure,mechanical properties,and fracture analysis.The possibilities of sulfide stress cracking,hydrogen induced delayed cracking,and stress corrosion cracking were discussed,and the stress corrosion sensitivity of welds in the environment with biocide and corrosion inhibitor was verified using slow strain rate testing.The results show that due to varying degrees of welding defects such as excessive welding height,weld nodules,and uneven thickness welding,the cracking of the pipeline circumferential weld was mainly caused by stress corrosion due to the influence of corrosive media.At the same time,some welds exhibited hydrogen induced delayed cracking.
关键词
页岩气/管线钢/环焊缝/失效分析/应力腐蚀开裂/氢致延迟开裂Key words
shale gas/pipeline steel/girth weld/failure analysis/stress corrosion cracking/hydrogen induced delayed cracking引用本文复制引用
出版年
2024
NETL
NSTL
万方数据