某气田弹簧管压力表失效与汞腐蚀  

Failure of Spring Pressure Gage and Mercury Corrosion in Gas Field

作　　者：林冠发 王俊奇[2] 马金龙[2] 宋成立 丁晗[2] 李磊 

机构地区：[1]中国石油集团石油管工程技术研究院,西安710077 [2]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《装备环境工程》2017年第12期1-7,共7页Equipment Environmental Engineering

摘　　要：目的针对某气田井口压力表发生刺漏的情况,分析压力表弹簧管发生刺漏的原因。方法采用无损检测渗透法、金相显微镜、扫描电子显微镜及其能谱分析仪的方法或设备,检查其内部结构和弹簧管表面损伤情况,对损伤部位进行观察与分析。结果弹簧管上有一穿透性的裂纹,以沿晶方式扩展,并在断口的晶粒夹杂处和表面检测到少量的汞元素和CO_2腐蚀产物。结论确定该压力表弹簧管发生刺漏是其材质Monel合金中的合金元素Al和Cu与天然气中的汞形成汞齐而发生了汞腐蚀导致开裂的。Objective To analyze causes for leaking of spring tube of pressure gage based on leaking of pressure gage of certaingas field. Methods The inner structure and surface damage of spring tube were observed, and the damage regions were detectedwith permeating method of nondestructive testing, metallographic microscope, scanning electron microscope （SEM） and energydispersive spectrometer （EDS）. Results There was a penetrative crack extending along the crystal in the tube. The mercury elementand a bit of C 02 corrosion product were detected in the mixing region between and on the crystal grains. Conclusion The leaking ofspring tube in the pressure gage is resulted from the mercury corrosion that the A1 and Cu elements in the spring tube made fromMonel alloy formed amalgam with Hg in the gas and the cracking of the tube under the inner pressure action.

关 键 词：弹簧管压力表 刺漏 汞 腐蚀 气田 

分 类 号：TJ07[兵器科学与技术—兵器发射理论与技术] TG174[金属学及工艺—金属表面处理]