某气井弹簧管压力表泄漏原因分析  

Causes Analysis of Spring Tube Pressure Gauge Leakage in a Gas Well

作　　者：王帅 宁长春[3] 蒋丽维 张盈盈 丰劲松[3] 陈庆国 夏晓晖 林冠发 WANG Shuai;NING Changchun;JIANG Liwei;ZHANG Yingying;FENG Jinsong;CHEN Qingguo;XIA Xiaohui;LIN Guanfa(State Key Laboratory of Performance and Structural Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;College of Chemistry&Environmental Engineering,Yangtze University,Jingzhou,Hubei 434023,China;Tarim Oilfield Company of Petrochina,Korla,Xinjiang 841000,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;CNPC Engineering Technology Research Co.Ltd.,Tianjing 300451,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077 [2]长江大学化学与环境工程学院,湖北荆州434023 [3]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 [4]中国石油勘探开发研究院,北京100083 [5]中国石油集团工程技术研究有限公司,天津300451

出　　处：《石油管材与仪器》2023年第4期80-83,90,共5页Petroleum Tubular Goods & Instruments

摘　　要：为了确定某气井弹簧管压力表泄漏失效原因,用扫描电子显微镜X射线能谱(EDAX)、金相组织分析、着色渗透探伤法(PT)和体视显微镜(OM)对其宏观相貌、微观形貌、化学成分和金相组织等理化性能进行试验分析。结果表明,该弹簧管的材料是紫铜,其表面上的裂纹已穿透弹簧管管壁,属于沿晶开裂。该弹簧管失效的原因是在含有汞的天然气中,汞与紫铜发生的汞齐化以及金属的液化和脆化作用,使紫铜弹簧管的强度大幅度下降,在管线内压的作用下产生了裂纹,该裂纹在弹簧管的使用过程中逐渐扩展并穿透了其管壁,最后导致该弹簧管泄漏失效。In order to analyze the leakage failure cause of spring tube pressure gauge in a gas well pipeline,the physical and chemical characteristics such as macro morphology,micromorphology,chemical composition and metallographic structure were analyzed with scanning electron microscope X-ray energy dispersive spectroscopy(EDAX),metallographic analysis,dye penetrant testing(PT)and stereomicroscope.The results show that the material of spring tube is red copper,the cracks in its surface has penetrated the wall of the spring tube,which belongs to intergranular cracking.The cause of the failure of the spring tube is that in the natural gas containing mercury,mercury amalgamation with red copper,as well as the liquefaction and embrittlement of metals,greatly reduced the strength of the red copper spring tube.Cracks generated under the effect of the internal pressure of the pipeline.During the use of the spring pipe,the cracks gradually propergated and penetrated the pipe wall,and finally leaded to the leakage failure of the spring tube.

关 键 词：弹簧管压力表 失效分析 汞 金属液化脆化 单井管线 

分 类 号：TE973[石油与天然气工程—石油机械设备]