摘要
为了确定某集气管道环焊缝开裂失效的原因,对失效样品进行了宏观形貌分析、理化性能试验、焊缝性能试验、断口微观形貌及能谱分析。结果表明,失效样品材料的理化性能均符合GB/T 9711—2017、SY/T 5257—2012和SY/T 4103—2006标准的要求;环焊缝部位存在长度为175 mm的裂纹,裂纹从环焊缝的内表面扩展至环焊缝的外表面,环焊缝开裂断口呈现脆性断裂特征,腐蚀产物中存在大量的S元素。管道服役时在内压作用下管道环焊缝部位存在轴向拉应力,因而在湿硫化氢与拉应力和焊接缺陷的综合作用下使管道的环焊缝部位发生了应力腐蚀开裂。
In order to determine the cause of cracking failure of a gas gathering pipeline girth weld,macroscopic morphology analysis,physical and chemical performance test,weld performance test,fracture microscopic morphology and energy spectrum analysis were carried out on the failed samples.The results show that the physical and chemical properties of the failed samples meet the requirements of GB/T 9711—2017,SY/T 5257—2012 and SY/T 4103—2006 standards.There is a crack with a length of 175 mm in the area of the girh weld,and the crack extends from the inner surface of the girth weld to the outer surface.The cracking fracture shows the characteristics of brittle fracture,and a large amount of S element exists in the corrosion product.When the pipeline was in service,there was axial tensile stress on the girth weld under the internal pressure,and thus stress corrosion cracking occurred under the combined effect of wet hydrogen sulfide,tensile stress and welding defects.
作者
王登海
邱鹏
卢鹏飞
胡涛
李彦鹏
冯文昊
吕乃欣
付安庆
刘君林
WANG Denghai;QIU Peng;LU Pengfei;HU Tao;LI Yanpeng;FENG Wenhao;LYU Naixin;FU Anqing;LIU Junlin(PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710018,China;Changqing Engineering Design Co.,Ltd.,Xi′an,Shaanxi 710018,China;State Key Laboratory of Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Shaanxi Jiuzhou Petroleum Engineering Technology Service Co.,Ltd.,Xi′an,Shaanxi 710075,China;Drilling and Production Technology Research Institute of Qinghai Oilfield,Dunhuang,Gansu 736202,China)
出处
《石油管材与仪器》
2023年第6期71-76,共6页
Petroleum Tubular Goods & Instruments
基金
青海省科技成果转化项目“柴达木盆地高温高压及含硫储层试油工艺技术研究”(编号:2021-SF-162)。
关键词
环焊缝
脆性断裂
硫化物
应力腐蚀开裂
集气管道
girth weld
brittle fracture
sulphides
stress corrosion cracking
gas gathering pipeline
作者简介
第一作者:王登海,男,1969年生,正高级工程师,1994年毕业于西南石油大学化工工艺专业,获硕士学位,现主要从事油气田地面工程规划设计工作。E-mail:Wdhl_cq@petrochina.com.cn。
