塔河油田集输管线20#钢在CO2/H2S环境中的腐蚀行为  

The Corrosion Behavior of 20# Steel in Tahe Oilfield Gathering and Transportation Pipeline CO2/H2S Environment

作　　者：张志宏 许艳艳 葛鹏莉 陈晓华 ZHANG Zhihong;XU Yanyan;GE Pengli;CHEN Xiaohua(Northwest Oil Field Branch Company Petroleum Engineering Technology Research Institute,Urumqi,830011)

机构地区：[1]中石化西北油田分公司石油工程技术研究院

出　　处：《工业安全与环保》2020年第1期32-36,共5页Industrial Safety and Environmental Protection

摘　　要：为充分了解20#钢在塔河油田集输管线工况环境中的腐蚀行为,采用高温高压釜研究CO2/H2S分压比、温度和pH值对20#钢在CO2/H2S环境中的腐蚀规律的影响,并利用扫描电镜(SEM)分析腐蚀产物形貌特征。结果表明:CO2分压不变时,随着H2S分压的增加,20#钢的腐蚀速率先增大后减小,H2S分压为0.01 MPa时的腐蚀速率达到最大0.435 mm/a;随着温度的升高,20#钢的腐蚀速率逐渐增大,在100℃时腐蚀速率高达2.280 mm/a;CO2控制下20#钢的腐蚀速率随着pH值的增大而减小;H2S控制下20#钢的腐蚀速率随着pH值的增大而增大。In order to fully understand the corrosion behavior of 20#steel in the gathering and transportation pipeline environment of Tahe oilfield,a high-temperature and high-pressure autoclave was used to study the influence of partial pressure ratio of CO 2/H 2S,temperature and pH value on the corrosion law of 20#steel in the environment of CO 2/H 2S,and scanning electron microscope(SEM)was used to analyze the appearance characteristics of the corrosion products.The results show that,when the partial pressure of CO 2 remains unchanged,with the increase of H 2S partial pressure,the corrosion rate of 20#steel first increases and then decreases.When the partial pressure of H 2S is 0.01 MPa,the corrosion rate reaches the maximum of 0.435 mm/a.With the increase of temperature,the corrosion rate of 20#steel increases gradually,up to 2.280 mm/a at 100℃.Under the control of CO 2,the corrosion rate of 20#steel decreases with the increase of pH value.Under the control of H 2S,the corrosion rate of 20#steel increases with the increase of pH value.

关 键 词：塔河油田 20#钢 CO2 /H2S 腐蚀行为 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]