某海上油田混输海管腐蚀原因分析及防腐措施研究

Analysis of Corrosion and Control of Mixed Transport Pipeline in an Offshore Oil Field

选用某海上油田已运行7 a的外输海底海管,通过分析防腐工艺、运行工况、现场挂片、内检测数据、清管垢样和细菌检测结果,开展腐蚀原因分析。结果表明,腐蚀主因是垢下微生物腐蚀,FeCO_(3)沉积为SRB等细菌的滋生提供了环境,微生物腐蚀及流体中的H_(2)S导致金属发生腐蚀。本文结合这条海管的情况给出防腐措施建议,为此类型海管的腐蚀防护提供借鉴。

An external transmission sea pipe served in an offshore oilfield for 7 years is selected for cause analysis of corrosion by means of analyzing the anticorrosion process,operating conditions,on-site hanging sample morphology,internal inspection data,clean pipe scale samples and bacterial detection results.The results show that the main cause of corrosion is microbial corrosion under the scale,and FeCO_(3) deposition provides an environment for the breeding of bacteria such as SRB,wherein microbial corrosion and H_(2)S in the fluid lead to corrosion of the metal.This article proposes anticorrosion measures based on the situation of the submarine pipeline,which provides reference guide for the corrosion protection of the similar submarine pipelines in other sea areas.