L80钢的H_(2)S腐蚀行为及H_(2)S缓蚀剂的性能  

H_(2)S Corrosion Behavior of L80 Steel and Performance of H2S Corrosion Inhibitor

作　　者：肖洒[1] 孙玉豹[1] 王少华[1] 姬辉[1] 刘亚琼 蔡俊 XIAO Sa;SUN Yubao;WANG Shaohua;JI Hui;LIU Yaqiong;CAI Jun(China Oilfield Services Limited,CNOOC,Tianjin 300459,China)

机构地区：[1]中海油田服务股份有限公司,天津300459

出　　处：《腐蚀与防护》2023年第1期30-35,共6页Corrosion & Protection

摘　　要：通过高温高压动态反应釜研究了温度、H_(2)S分压、流速对L80钢H_(2)S腐蚀行为的影响,对腐蚀产物进行SEM和EDS元素分析,优选了耐高温的H_(2)S缓蚀剂LH-11,并对其缓蚀性能进行研究。结果表明:L80钢的H_(2)S腐蚀速率在80℃达到最大值,在140℃达到最小值;L80钢的腐蚀速率随H_(2)S分压的升高而增大,随流速的增大逐渐增大,腐蚀产物主要为硫铁化合物,结构疏松不规则,且有孔隙。缓蚀剂LH-11对L80钢的缓蚀率可达到87.05%,耐温180℃;添加缓蚀剂后,L80钢的腐蚀速率可降至0.1 mm/a以内,该缓蚀剂适用于不同H_(2)S分压和不同流速条件,可对热采管柱起到较好的保护作用。The effects of temperature,H_(2)S partial pressure and flow rate on the H_(2)S corrosion behavior of L80 steel were studied by using a high temperature and high pressure dynamic autoclave,and the corrosion products were analyzed by SEM and EDS.The high temperature resistant H_(2)S corrosion inhibitor LH-11 was selected to study its corrosion inhibition performance.The results showed that the H_(2)S corrosion rate of L80 steel reached the maximum at 80℃and the minimum at 140℃;the corrosion rate of L80 steel increased with the increase of H_(2)S partial pressure,and gradually increased with the increase of flow rate.The corrosion products were mainly sulphur-iron compounds with loose and irregular structure and pores.The corrosion inhibition rate of the corrosion inhibitor LH-11 to the steel could reach 87.05%,and the temperature resistance was 180℃.After adding the corrosion inhibitor,the corrosion rate of the steel could be reduced to less than 0.1 mm/a.The corrosion inhibitor was suitable for different H_(2)S partial pressure and different flow rate conditions,and could play a good role in protecting the thermal recovery string.

关 键 词：硫化氢腐蚀 稠油开采 缓蚀剂 微观形貌 腐蚀与防护 

分 类 号：TG174[金属学及工艺—金属表面处理]