摘要
针对某油田注水管道腐蚀穿孔问题,采用宏观形貌分析、理化性能检测、腐蚀产物微观形貌及电化学分析等方法,试验分析了管道环焊缝腐蚀失效原因。失效管道环焊缝为内腐蚀穿孔,穿孔起始于根焊部位,并沿着焊缝与热影响区交界区域扩展,表面腐蚀产物主要为FeO(OH)。恒电位极化测试结果表明,根焊部位、焊缝以及热影响区交界区域优先溶解,在服役过程中根焊部位发生腐蚀后,沿着根焊与热影响区界面扩展,导致腐蚀穿孔。建议针对环焊缝管道进行补口处理,同时选择适用的抗氧缓蚀剂。
The failure cause of the water injection pipeline in an oil field was analyzed by means of macroscopic morphology analysis,physical and chemical properties analysis,microscopic morphology of corrosion products and electrochemical analysis.The perforation started at the root weld and expanded along the junction of the weld and the heat-affected zone.The surface corrosion product was mainly FeO(OH).The constant potential polarization test results show that the root weld,welding and heat-affected zone junction area is preferentially dissolved.The interface between welding and heat-affected zone expands,resulting in corrosion perforation.It is recommended to focus on the treatment of the girth welded pipes and choose the appropriate deoxidizing or corrosion inhibitors at the same time.
作者
朱凯峰
安静
ZHU Kaifeng;AN Jing(Dagang Oilfield Production Technology Research Institute,Petro China,Tianjin 300280,China;CNOOC(Tianjin)Pipeline Engineering Technology Co.Ltd.,Tianjin 300000,China)
出处
《石油管材与仪器》
2022年第4期75-79,共5页
Petroleum Tubular Goods & Instruments
关键词
注水管道
环焊缝
腐蚀穿孔
氧腐蚀
water injection pipeline
girth welds
corrosion perforation
oxygen corrosion
作者简介
第一作者:朱凯峰,男,1988年生,工程师,2013年毕业于中国石油大学(华东)石油与天然气工程专业,获硕士学位,现主要从事管道和站场完整性管理工作。E-mail:zhukfeng@petrochina.com.cn。
