漏电导致阴极保护绝缘接头内腐蚀失效的有限元分析

FEM Analysis of Inner Corrosion Failure Induced by Current Leakage for Cathode Protection Insulating Joint

对漏电导致阴极保护绝缘接头内腐蚀失效问题,建立了绝缘接头有限元计算模型,开展了绝缘接头漏电电流密度大小与分布数值计算,并讨论了管道绝缘接头两侧电位差,输送介质电阻率和绝缘接头内涂层缺陷对绝缘接头漏电电流密度大小与分布的影响规律.模拟计算结果与油田现场失效绝缘接头内腐蚀现象一致,并给出了相应的防护建议.

Numerical simulation of the magnitude and distribution of the leakage current density by finite element analysis（FEM） was used to analyze internal corrosion failure induced by current leakage for cathode protection insulating joint.Effects of the potential difference on both sides of insulating joint,transmission medium resistivity and inner coat defects of insulating joint on the magnitude and distribution of the leakage current density were discussed.The FEM results agreed well with the insulating joint corrosion phenomena in the oilfield working place.