80S钢在低含硫气井产出液中电化学耐蚀行为研究  

Study on Electrochemical Corrosion Resistance Behavior of 80S Steel in Produced Fluids of Low-sulfur Gas Well

作　　者：杨添麒 董晨曦 王丹丹 王少奇 杨开利 YANG Tian-qi;DONG Chen-xi;WANG Dan-dan;WANG Shao-qi;YANG Kai-li(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an Shaanxi 710065,China;No.2 Gas Production Factory of Yanchang Petroleum Group Yanchang Gas Field Company,Yulin Shaanxi 718500,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [2]陕西延长石油(集团)有限责任公司延长气田采气二厂,陕西榆林7185001

出　　处：《当代化工》2022年第4期805-809,814,共6页Contemporary Chemical Industry

基　　金：陕西延长石油(集团)有限责任公司项目,延安气田969井区含硫气井井筒及管线腐蚀监测方案研究(项目编号:ycsy2020ky-B-09);国家科技重大专项,大型油气田及煤层气开发(项目编号:2018ZX05059-004)。

摘　　要：研究了80S钢在低含硫气井产出液中的电化学耐蚀行为,利用动电位极化、电化学阻抗谱等方法研究了温度、含硫量对80S钢的腐蚀影响。结果表明:80S钢随温度升高其腐蚀电流密度(Icorr)先增大而后有所减小,电荷传递电阻(Rt)呈现了先大幅减小后稍有增大的趋势;随介质硫含量增大其腐蚀电流密度增大,电荷传递电阻相比在基础介质中的Rt值大幅减小,表明加入的含硫物加速了阴极反应的活化过程,增大了80S钢的腐蚀性。The corrosion resistance behavior of 80S steel was studied in the produced fluids of the low-sulfur gas well.The influence of temperature and sulfur content on 80S steel was conducted by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) methods. The results showed that the corrosion current density(Icorr) of 80S steel increased firstly and then decreased with increasing temperature, while the charge transfer resistance(Rt)decreased and then increased slightly. With increasing of sulfur content in the experimental medium, the corrosion current density increased and the charge transfer resistance decreased significantly compared with the Rt value in the basic medium. It indicated that the addition of sulfur compounds accelerated the activation process of cathode reaction and increased the corrosion of 80S steel.

关 键 词：80S钢 低含硫 CO_(2)/H2S腐蚀 极化曲线 交流阻抗 

分 类 号：TE983[石油与天然气工程—石油机械设备]