天然气集输管道积液对有机胺缓蚀性能的影响

采用室内动态循环多相流高温高压釜模拟气田集输管线的服役环境,在流速5m/s,有无积液存在条件下进行腐蚀试验、电化学试验和接触角测量,研究了积液对于有机胺缓蚀剂缓蚀性能的影响。结果表明:积液的存在使管材的腐蚀速率增大,相对降低了有机胺缓蚀剂的缓蚀率,且加大了试样发生点蚀的概率。建议合理设计各设施的位置、管线的走向和适当的监测,尽量减少管道的落差,从而减少管道中的积液的形成,同时使用具有一定抗冲刷能力的缓蚀剂。

Influences of Fluid in Gathering Pipeline of Natural Gas on Corrosion Inhibition of Organic Amine

In order to study the influences of fluid in natural gas gathering pipeline on corrosion inhibition of organic amine,a corrosion test was simulated in home-made dynamic multiphase flow autoclave with flow rate of 5m/s in the conditions of fluid and no fluid in gathering pipe.Besides,electrochemical methods and contact angle measurements were also used to analyze the corrosion behavior.The results show that at the presence of fluid in gathering pipe,the corrosion rate of pipe materials increased greatly,the inhibition efficiency of organic amine decreased and the probability of pitting corrosion on the sample surface increased.Rational design of the location of each facility,pipeline direction and proper monitoring were recommended to minimize the gap between the pipes,thus reducing the formation of fluid in pipes.And inhibitor with anti-erosion effect should be used.