某油田注水井油管腐蚀失效分析  

Failure Analysis of Tubing Corrosion in Water Injection Well

作　　者：张帅 杨阳 金磊 王海锋 杨中娜 罗懿 Zhang Shuai;YANG Yang;JIN Lei;WANG Haifeng;YANG Zhongna;LUO Yi(CNOOC Energy Development Co.,Ltd.,Engineering Technology Branch,Tianjin 300452,China;CNOOC(Tianjin)Pipeline Engineering Technology Co.,Ltd.,Tianjin 300452,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,天津300452 [2]中海油(天津)管道工程技术有限公司,天津300452

出　　处：《石油化工腐蚀与防护》2020年第3期58-61,共4页Corrosion & Protection In Petrochemical Industry

摘　　要：采用宏观分析、材质成分分析、金相组织分析、腐蚀产物分析和细菌检测分析等方法对某注水井油管的腐蚀穿孔原因进行了失效分析。分析结果表明:在长时间使用后,油管材质中存在的非金属夹杂物造成材料的早期破坏;该井水质易结CaCO 3垢,在材料性能薄弱处首先发生垢下腐蚀,环境中的硫酸盐还原菌和O 2的存在进一步促进了垢下腐蚀,最终导致油管腐蚀穿孔。Failure analysis of tubing perforation in water injection well was performed by means of macroscopic analysis,material composition analysis,metallographic structure analysis,corrosion product analysis and bacteria detection.The study shows that the early damage of material came from non-metallic inclusions in tube after long-term usage;under-deposit corrosion easily occurred at the place with poor material performance since CaCO 3 deposited in well water;the existence of sulfate reducing bacteria and O 2 in the environment further promoted corrosion until pipeline leakage.

关 键 词：注水井油管 腐蚀穿孔 垢下腐蚀 失效分析 

分 类 号：TE983[石油与天然气工程—石油机械设备]