N80钢在含H_(2)S和CO_(2)的环空保护液中的腐蚀行为  

Corrosion Behavior of N80 Steel in Annular Protection Fluid Containing H_(2)S and CO_(2)

作　　者：南源 黄锦圳 陈汇凯 马双政 陈小娟 闭锦叶 鲁国强 刘洒文 赵彩玲 汪建明 张泽佳 NAN Yuan;HUANG Jinzhen;CHEN Huikai;MA Shuangzheng;CHEN Xiaojuan;BI Jinye;LU Guoqiang;LIU Sawen;ZHAO Cailing;WANG Jianming;ZHANG Zejia(Engineering Technology Branch,CNOOC Energy Development Co.,Ltd.,Zhanjiang 524507,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang),Zhanjiang 524002,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,湛江524507 [2]南方海洋科学与工程广东省实验室(湛江),湛江524002

出　　处：《腐蚀与防护》2024年第12期17-23,共7页Corrosion & Protection

基　　金：南方海洋科学与工程广东省实验室(湛江)林君院士工作站人才引进科研项目(ZJW-2020-08-08)。

摘　　要：采用高温高压动态评价系统,研究了南海某油田N80管道钢在含H_(2)S和CO_(2)的环空保护液中的腐蚀行为,采用扫描电镜(SEM)、能谱仪(EDS)、拉曼光谱仪、X射线衍射仪(XRD)等方法,分析了其腐蚀机理。结果表明:在该环境中,N80钢的腐蚀产物以Fe CO_(3)、Fe S为主,腐蚀速率随着腐蚀时间的延长而逐渐降低;早期腐蚀进程受到H_(2)S和CO_(2)共同控制,腐蚀产物粗糙不致密且存在大量凹槽和裂纹,腐蚀后期以CO_(2)控制为主,腐蚀产物层逐渐致密,产物颗粒尺寸增大,可对腐蚀性物质产生一定的阻隔作用。在CO_(2)腐蚀防护过程中,应严格控制H_(2)S等杂质气体的含量,延缓腐蚀发展。The corrosion behavior of N80 pipeline steel in annulus protection fluid containing H_(2)S and CO_(2)in an oilfield of South China Sea was studied by high temperature and high pressure dynamic evaluation system.The corrosion mechanism was analyzed by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),Raman spectrometer and X-ray diffractometer(XRD).The results showed that in this environment,the corrosion products of N80 steel were mainly FeCO_(3)and FeS,and the corrosion rate gradually decreased with the increase of corrosion time.The early corrosion process was controlled by H_(2)S and CO_(2).The corrosion products were rough and not dense,and there were a large number of grooves and cracks.In the later stage of corrosion,the corrosion process were mainly controlled by CO_(2).The corrosion product layer was gradually dense,and the particle size of the product increased,which could produce a certain barrier effect on the corrosive substances.In the process of CO_(2)corrosion protection,the content of impurity gases such as H_(2)S should be strictly controlled to delay the development of corrosion.

关 键 词：环空保护液 CO_(2)腐蚀 H_(2)S腐蚀 腐蚀机理 

分 类 号：TG174.4[金属学及工艺—金属表面处理]