某海底管道失效原因

Failure Reason of a Subsea Pipeline

某海底管道在投产3a后发生了腐蚀穿孔,通过检测数据分析、腐蚀速率模拟计算、实物管段检测分析、内腐蚀模拟试验及缓蚀剂有效性分析等方法对其失效原因进行了分析。结果表明,投产后CO2和H2S含量增高,缓蚀剂未达到预期效果,产生严重的CO2局部腐蚀,这是造成海底管道腐蚀穿孔失效的主要原因。针对类似的失效情况,提出了海底管道安全运行的应对措施。

A subsea pipeline leaked only after going into operation for three years.The leak reasons were analyzed by means of inspection data analysis,corrosion rate simulation calculation,testing of failed pipe,internal corrosion simulation experiment and corrosion inhibitor effectiveness analysis.The results showed that CO2 and H2S contents were increased in oil after starting production,the effect of corrosion inhibitors was undesirable,thus serious CO2 localized corrosion occured,which was the main reason causing the corrosion failure of the subsea pipeline.Some practical measurements for safe operation of similar subsea pipelines were put forward.