海上油田某注水井油管短节腐蚀穿孔原因分析  

Cause analysis of corrosion and perforation of tubing pup joint in water injection well at offshore oil field

作　　者：冯电稳 李阳 安静 杨中娜 王骅钟 倪剑 FENG Dianwen;LI Yang;AN Jing;YANG Zhongna;WANG Huazhong;NI Jian(CNOOC(Tianjin)Pipeline Engineering Technology Co.,Ltd.,Tianjin 300452,China;Tianjin Beihai Oil Human Resource Consulting Service Co.,Ltd.,Tianjin 300452,China;CNOOC Energy Technology&Services Limited Key Laboratory of Safety Guarantee Technology for Subsea Pipeline,Tianjin 300452,China;Tianjin Key Laboratory of Subsea Pipeline,Tianjin 300452,China)

机构地区：[1]中海油(天津)管道工程技术有限公司,天津300452 [2]天津北海油人力资源咨询服务有限公司,天津300452 [3]海油发展海底管道安全服役保障技术重点实验室,天津300452 [4]天津市海底管道重点实验室,天津300452

出　　处：《石油化工腐蚀与防护》2024年第4期52-58,共7页Corrosion & Protection In Petrochemical Industry

摘　　要：海上油田某注水井油管短节发生了腐蚀穿孔。通过宏观形貌观察、化学成分分析、硬度测试分析、金相组织分析、腐蚀产物微观形貌观察和成分分析、有限元分析等方法对失效油管短节腐蚀原因进行研究。结果表明,该油管材质符合标准要求,该油管短节内壁发生了CO_(2)腐蚀;由于油管结构规格的变化,该3.5英寸(8.89 cm)腐蚀穿孔油管短节处于4.5英寸(11.43 cm)变扣短节的下端,穿孔管柱内流体流速增大且产生湍流,所以导致油管短节冲刷腐蚀;CO_(2)腐蚀和冲刷腐蚀共同作用是造成油管短节发生穿孔的根本原因。Corrosion and perforation occurred at the tubing pup joint of a water injection well in an offshore oil field.The corrosion causes were studied by means of macroscopic morphology observation,chemical composition analysis,hardness test,metallographic structure examination,microstructure observation and composition analysis of corrosion products,as well as finite element analysis.The results indicated that the material of tubing met the standard requirements;CO_(2)corrosion occurred on the inner wall of the tubing pup joint.Due to the change in the structure of tubing,3.5″corroded pup joint was located at the lower end of 4.5″tubing joint,causing an increase in fluid flow velocity and turbulence in the perforated pipe,which led to erosion and corrosion of the pup joint.The combined effect of CO_(2)corrosion and erosion corrosion was the fundamental reason for the perforation of tubing pup joint.

关 键 词：油管短节 CO_(2)腐蚀 冲刷腐蚀 仿真模拟 失效分析 

分 类 号：TE985[石油与天然气工程—石油机械设备]