某单井输气用修复油管开裂失效分析  

Cracking Failure Analysis of Repaired Oil Pipeline in a Gas Well

作　　者：田鸣 崔永兴[1] 黄倩 赛亚尔·库西马克 王瑞雪[1] TIAN Ming;CUI Yongxing;HUANG Qian;KOXMAK Sayyara;WANG Ruixue(Tarim Oilfield Company,Petrochina,Xinjiang Korla 841000,China)

机构地区：[1]中国石油天然气股份有限公司塔里木油田分公司,新疆库尔勒841000

出　　处：《装备环境工程》2025年第1期178-185,共8页Equipment Environmental Engineering

摘　　要：目的分析西部油田某油井至转油站的修复油管线开裂失效的原因。方法利用宏观检查、理化检验和断口分析方法,对宏观形貌、化学成分、金相组织、拉伸性能、维氏硬度、断口微观形貌及元素能谱进行检测分析。结果该开裂修复油管化学成分、拉伸性能符合API 5CT对P110材质要求,冲击性能、金相组织未见异常,其连接的螺纹未上紧至指定位置,环向焊接后在焊缝热影响区焊趾处形成了硬度高达476HV10的马氏体组织。结论P110修复油管碳当量高,可焊性差,环焊后在焊趾处形成了马氏体组织,导致其热影响区出现冷裂纹,在应力作用下扩展造成开裂失效。The work aims to analyze the cracking failure of the repaired oil pipeline from an oil well to a transfer station in the Western oilfield.The macroscopic inspection,physical and chemical inspection and fracture analysis were used to analyze the macro-morphology,chemical composition,metallographic structure,tensile properties,Vickers hardness,micro-morphology of fracture and energy spectrum of elements.The chemical composition and tensile properties of the repaired oil pipeline met the requirements of API 5CT for P110 steel,and no abnormality was found in impact properties and metallographic structure,but the threads were not tightened up to the specified position,and after girth welding,martensite structure with hardness as high as 476HV10 was formed at the toe of weld heat-affected zone.P110 repaired oil pipeline has high carbon equivalent and poor weldability,so martensite structure is formed at the weld toe after girth welding,which leads to cold cracks in its heat-affected zone,causing expansion under stress and resulting in cracking failure.

关 键 词：油井 输气管线 修复油管 开裂 环焊缝 理化检验 失效分析 

分 类 号：TG172[金属学及工艺—金属表面处理]