深井硫化氢腐蚀规律试验研究

Experiment study on H2S corrosion laws in deep wells

李兆敏 王登庆 张志宏 张星 董斌

LI Zhaomin WANG Dengqing ZHANG Zhihong ZHANG Xing DONG Bin

中国石油大学石油工程学院，山东东营257061 中国石化胜利油田有限公司采油工艺研究院，山东东营257000 中国石化西北分公司工程技术研究院，新疆乌鲁木齐830011

College of Petroleum Engineering in China University of Petroleum, Dongying 257061, China Shengli Oil Production Research Institute, Dongying 257000, China Research Institute of Engineering Technolgy, Sinope Northwest Company, Urumuqi 830011, China

油气田开发过程中，油气藏中常常存在二氧化碳、硫化氢等腐蚀性气体，严重影响着油气田的正常生产。应用油田试井钢丝进行现场试验，通过能谱分析、电镜扫描、金相等方法对腐蚀形貌特征进行研究，结果表明不同井段腐蚀规律与特征存在较大差异，腐蚀产物、形貌以及腐蚀速率的大小各不相同，电化学腐蚀随着温度与压力的增加而增加，井口腐蚀以点蚀特征为主，井下腐蚀以应力腐蚀开裂为主。试验结果为油气井腐蚀防护提供指导。

During the process of development, there are always exist carbon dioxide, hydrogen sulfide and other corrosive gases in oil and gas reservoirs, severely affecting the normal production in oil and gas fields. Testing wire to conduct a field trial, the corrosion characteristics of well steel wires are analyzed based on the spectrum analysis, the electron microscope scanning, and the metallographic analysis. Results show that corrosion laws and characteristics vary a lot in different well depth. The corrosion products and appearance as well as the corrosion rate are not the same. The electrochemistry corrosion intensifies as the temperature and pressure increase. Pitting corrosion dominates the well head corrosion, while stress corrosion dominates the downhole corrosion. The experiment results can be a good reference for corrosion prevention of oil and gas wells.