N80钢在中高温H_(2)S环境中的腐蚀与缓蚀剂评价研究  

Corrosion and Inhibitor Evaluation of N80 Steel in Medium and High Temperature H_(2)S Environment

作　　者：孙玉豹[1] 王少华[1] 肖洒[1] 姬辉[1] SUN Yu-bao;WANG Shao-hua;XIAO Sa;JI Hui(China Oilfield Services Limited,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：《材料保护》2021年第10期41-43,57,共4页Materials Protection

摘　　要：海上热驱采油中发现伴生H_(2)S,给生产油管带来了腐蚀和安全隐患,为了分析其腐蚀特点,以对其进行腐蚀防护,采用高压釜失重法和扫描电镜,研究了中高温含H_(2)S油井采出水中N80钢的腐蚀行为,并探讨了流速和H_(2)S分压的影响,进而筛选评价了适用的H_(2)S缓蚀剂。结果表明:在含H_(2)S采出水中N80钢的腐蚀较为严重,80℃时的腐蚀速率最高;随着H_(2)S分压的升高和流速的增大,其腐蚀速率迅速增大。腐蚀后钢表面均存在黑色的硫铁化物,表面产物较疏松、不完整。不同缓蚀剂加入均可抑制腐蚀,其中缓蚀剂CI-S-11的效果最好,其缓蚀率超过85%,可用于现场油管保护。Associated H_(2)S was found in offshore thermal flooding oil production,which brought corrosion and safety hazards to production tubing.In order to analyze the corrosion characteristics and protect against corrosion,autoclave weightlessness method and scanning electron microscope were employed to analyze the corrosion behavior of N80 steel in the produced water of medium and high temperature H_(2)S-containing oil wells.Moreover,the effects of flow rate and H_(2)S partial pressure were discussed,and suitable H_(2)S corrosion inhibitors were screened and evaluated.Results showed that the corrosion of N80 steel in produced water containing H_(2)S was more serious,and the corrosion rate was the highest at 80℃;with the increase of H_(2)S partial pressure and flow rate,the corrosion rate increased rapidly.After corrosion,there were black ferrosulfides on the surface of the steel,and the surface products were loose and incomplete.All of different corrosion inhibitors added could inhibit corrosion.Among them,the corrosion inhibitor CI-S-11 possessed the optimal effect,and its corrosion inhibition rate exceeded 85%,which could be used for on-site tubing protection.

关 键 词：N80钢 中高温 硫化氢 腐蚀 缓蚀剂 

分 类 号：TG172[金属学及工艺—金属表面处理]