天然气集输倾斜管道腐蚀行为及缓蚀剂分布研究  

Corrosion Behavior and Distribution of Corrosion Inhibitors in Inclined Section for Natural Gas Gathering and Transportation Pipelines

作　　者：侯晓犇 刘宁 扈俊颖 HOU Xiaoben;LIU Ning;HU Junying(Southwest Oil and Gas Branch of China Petroleum and Chemical Corporation,Deyang 610041,China;School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,China;PipeChina Hunan Branch,Changsha 410016,China)

机构地区：[1]中国石油化工股份有限公司西南油气分公司采气三厂,德阳610041 [2]西南石油大学石油与天然气工程学院,成都610500 [3]国家石油天然气管网集团有限公司湖南分公司,长沙410016

出　　处：《中国腐蚀与防护学报》2025年第3期780-786,共7页Journal of Chinese Society For Corrosion and Protection

摘　　要：通过实验+CFD模拟研究了倾角为30°的天然气集输管道在气液两相流下的腐蚀行为及连续加注型缓蚀剂的分布规律和缓蚀效率。结果表明:当气相流速为3 m/s、携液量为7.5%时在倾角30°的管道中弯管段和倾斜段气液两相流转变为段塞流,使其成为腐蚀的主要区域,与现场集输管道腐蚀刺漏部位吻合。电化学测试与Fluent模拟结果均表明缓蚀剂在管道顶部和底部的浓度分布沿管道轴向均呈现先上升后降低的趋势,管道底部浓度高于相应部位的顶部浓度;管道底部倾斜段的腐蚀速率最大,表明缓蚀剂在倾斜管段处的覆盖度最小。The corrosion behavior of a pipeline with an inclination of 30°in gas-liquid two-phase flow,the distribution and the inhibition efficiency of corrosion inhibitors were studied by experiment and CFD simulation.The results indicate that in case of the gas phase flow rate of 3 m/s while carrying 7.5vol.%liquid,the gas-liquid two-phase flow in the bent and inclined sections transforms into slug flow,thereby,where become the main areas subjected to corrosion,which is consistent with the detected locations of pipeline leakage at the gas field site.Results of electrochemical test and the fluent simulation indicate that the concentration distribution of corrosion inhibitors at the top and bottom of the pipeline shows a trend of first increasing and then decreasing along the pipeline axis,the concentration at the bottom of the pipeline is higher than the corresponding concentration at the top of the corresponding part.The corrosion rate of the electrode in the inclined section is the highest,indicating the minimum coverage of the corrosion inhibitor at the inclined section.

关 键 词：倾斜管道 气液两相流 连续加注型缓蚀剂 CFD模拟 

分 类 号：TE257[石油与天然气工程—油气井工程]