采用数值模拟技术研究了套管内管道阴极保护的影响因素对套管内管道电位以及管地电位的影响.结果表明:套管涂层质量和管道涂层质量对管道电位都有较大影响,涂层质量越好,管道电位就越负,阳极使用寿命就越长;套管内安装牺牲阳极对套管内管道阴极保护有积极作用,避免了该特殊管段达不到阴极保护的效果;套管内电解质的电导率对管道电位有一定的影响,电导率越大,管道电位就越负;在套管段,涂层质量的好坏、内部是否安装阳极、电解质电导率的变化都对管地电位影响较小,无法根据管地电位判断管道是否达到阴极保护的标准或了解其内部的腐蚀环境.
The effects of influence factors of cathodic protection in casing on pipe potential and pipe-to-soil potential were studied using numerical simulation.The results show that the coating quality of casing and pipe had a great influence on pipe potential.The better the coating quality was,the more negative the pipe potential was,and the longer the anode service life was.The sacrificial anode installed in the inside of casing had positive effect on the cathodic protection of the pipe in casing.In addition,the electric conductivity of the electrolyte in casing had a certain effect on the pipe potential,and pipe potential shifted negatively with the increase of electrical conductivity.In the casing section,whatever the coating quality was,whether the anode was stalled in casing and whether the electrolyte conductivity change had few effects on the pipe-to-soil potential.It cannot be determined whether the pipe potential reaches the cathodic protection standard or how the internal corrosion environment is,according to pipe-to-soil potential.
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