摘要
针对长距离油气管道冲蚀腐蚀问题,以某油田公司腐蚀严重的埋地管道为研究对象,对长距离油气管道腐蚀问题进行分析。研究结果表明,阴极保护电位和输送原油温度均是影响埋地管道腐蚀效率的主要因素,且温度过高和施加电位过负均能加速油气管道的腐蚀;对于防腐层破损的管道,阴极保护电流屏蔽是引起埋地管道腐蚀的主要因素。腐蚀规律为与破损位置的距离越大,其阴极保护屏蔽效应越大;温度越高,屏蔽效应越小。在防腐层破损部位施加阴极保护,远端无法达到保护电位,金属表面环境条件更加严苛,腐蚀速率更高。最后,通过在保温层内部直接安装牺牲阳极和与固体缓蚀剂联合防腐可有效提升埋地管道的防腐效率。
Aiming at the erosion corrosion problem of long-distance oil and gas pipelines,the corrosion problem of long-distance oil and gas pipelines is analyzed by taking the buried pipelines with serious corrosion in an oilfield company as the research object.The research results show that the cathodic protection potential and the tempera⁃ture of crude oil are the main factors affecting the corrosion efficiency of buried pipelines,and too high temperature and too negative applied potential can accelerate the corrosion of oil and gas pipelines.For pipelines with damaged coating,cathodic protection current shielding is the main factor causing corrosion of buried pipelines.The corro⁃sion law is that the greater the distance from the damaged position,the greater the cathodic protection shielding ef⁃fect;the higher the temperature,the smaller the shielding effect.Cathodic protection is applied to the damaged part of the anticorrosive coating,and the distal end cannot reach the protection potential.The environmental condi⁃tions on the metal surface are more stringent and the corrosion rate is higher.Finally,the anticorrosion efficiency of buried pipelines can be effectively improved by directly installing sacrificial anodes inside the insulation layer and combining anticorrosion with solid corrosion inhibitors.
作者
冯佳鑫
FENG Jiaxin(East China Design Institute,Pipe China Engineering Technology Innovation Co.,Ltd.,Xuzhou 221008,Jiangsu China)
出处
《粘接》
2025年第10期148-151,共4页
Adhesion
关键词
油气管道腐蚀
阴极保护
阴极屏蔽
防腐层破损
屏蔽效应
corrosion of oil and gas pipelines
cathodic protection
cathodic shielding
damage to the anti-corro-sion layer
shielding effect
