海底管道封存重启后的腐蚀

Corrosion of the Sealed Submarine Pipeline after Restarting

为全面了解使用高含井水封存的X65钢制管道重启后的腐蚀状况,通过现场检测封存液中的溶解氧、总铁、CO_(2)、H_(2)S以及细菌(SRB、TGB、FB)含量,对封存前后的参数进行对比和分析。结果表明,海管重启后与封存时溶解氧含量无显著差别,海管重启后的总铁(含量)略高于封存前,H_(2)S、CO_(2)含量与封存前含量相比有所下降,海管整体腐蚀轻微。C海管收球后的SRB量为1000个/mL,TGB量为1000个/mL,FB量为1000个/mL,说明海管在静态的高含水井水中封存后出现了菌落的繁殖。建议对封存后的海管进行清管和杀菌处理。

In order to comprehensively understand the corrosion status of X65 steel pipelines sealed with high content well water after restart,the parameters before and after sealing were compared and analyzed by on-site detection of dissolved oxygen,total iron,CO_(2)content and H_(2)S concentration in the sealing solution,as well as bacteria(SRB,TGB,FB).The results show that there was no significant different in dissolved oxygen content after restarting the subsea pipeline compared to the storage of the pipeline,and dissolved oxygen corrosion was mild.The total iron content after the restart of the subsea pipeline was slightly higher than that before storage,with slight corrosion.The concentration of H_(2)S and CO_(2)after the restart of the subsea pipeline had decreased compared to that before storage.The SRB,TGB,and FB content of 1000/mL,1000/mL,and 1000/mL after receiving the ball from the C subsea pipeline indicate that bacterial colonies had proliferated after being sealed in static high water containing wells.The overall corrosion of the subsea pipeline was slight.It is recommended to clean and disinfect the sealed subsea pipeline.