摘要
某采气井在生产运行三年多时,单井支线与集气干线连接的三通发生了爆管事故,对事故原因进行分析。结果表明,三通爆管是由管壁腐蚀减薄导致管体无法承压引起的,而管壁腐蚀是由CO2腐蚀、高速流体冲刷、局部紊流冲蚀及电偶效应共同作用的结果,其中局部紊流和电偶效应是造成管壁腐蚀减薄穿孔直至爆管的主要原因。为控制电偶腐蚀的发生,应避免电位不同的两种金属或合金的接触。
After 3years production running of a gas recovery well,a blast accident of the tee tube connecting the single well branch and gas collecting main happened.The causes were studied.The results showed that the blast accident was caused by pipe wall corrosion thinning resulting in overpressure of the pipe body.The corrosion of the pipe resulted from CO2 corrosion,high velocity erosion,local turbulent erosion and bimetallic effect.Local turbulent erosion and bimetallic effect were the main causes of the pipe wall corrosion thinning and bursting.In order to control the occurrence of bimetallic corrosion,the contact of two kinds of metal or alloy with different potentials should be avotd.
出处
《腐蚀与防护》
CAS
北大核心
2014年第10期1056-1059,1064,共5页
Corrosion & Protection
关键词
凝析气田
集输管线
腐蚀
紊流
电偶效应
gas condensate field
collecting pipeline
corrosion
turbulent flow
bimetallic effect
