Study on Coupling Simulation of Corrosive Stress and Magnetization for Small Buried Ferromagnetic Pipeline
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摘要: 利用ANSYS有限元分析软件，对腐蚀管道模型在受内压及地磁场作用下的力-磁效应进行模拟，得出了管道模型在不同腐蚀间距及不同腐蚀深度下的应力分布和磁信号分布；同时利用管道弱磁检测仪对青海油田所辖管段的埋地小管道进行了检测，通过分析检测到的管道表面磁感应强度分量的梯度值dBX、dBY、dBZ的波形特征，确定了腐蚀缺陷位置，并将检测分析结果与模拟结果相比较，证明了两者有较好的一致性；结果表明利用管道磁信号的波形特征判断腐蚀缺陷的评价方法具有合理性，能够对埋地管道在非开挖状态下进行早期诊断，为弱磁检测技术提供理论依据。Abstract: The stress-magnetization effect of the pipeline under internal pressure and geomagnetic field is simulated via ANSYS, and the model for stress distribution and magnetic signal distribution of pipeline under different corrosion spacing and different corrosion depths were obtained. At the same time, the small buried pipeline of the pipe section under the jurisdiction of Qinghai Oilfield was tested with the weak magnetic detector of pipeline. The location of the corrosion defect was determined by analyzing the waveform characteristics of the gradient values of the magnetic induction components of the pipeline surface dBX, dBY and dBZ. Comparing the test results with the simulated, it is proved that the two results have a good consistency. The results show that it is reasonable to use the waveform characteristics of the magnetic signal of the pipeline to judge the corrosion defects. It can early diagnose the buried pipelines under trenchless conditions, and provide theoretical basis for the weak magnetic detection technology.
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表 1 开挖验证坑检测情况
开挖编号 里程 金属状况等级 腐蚀深度 TK01 K1+470 m 3 19.8% TK02 K1+663 m 2 23.5% TK03 K2+287 m 2 26.6% TK04 K2+751 m 3 13.7% TK05 K2+800 m 3 18.4% TK06 K3+267 m 2 21.5% TK07 K3+384 m 3 12.1% TK08 K3+429 m 3 5.7% TK09 K3+441 m 2 25.9% TK10 K3+489 m 3 9.7% TK11 K6+386 m 3 11.51% TK12 K7+244 m 2 28.9% TK13 K8+321 m 3 15.7% TK14 K10+45 m 3 19..0% TK15 K10+305.5 m 1 47.5% 
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表 2 K7+244 m管段超声测厚数据
距离/m 各时钟方向上的管道壁厚/mm 1 2 3 4 5 6 7 8 9 10 11 12 0 5.85 5.9 5.8 5.9 5.8 5.8 5.85 5.75 5.9 5.85 5.8 5.7 0.13 - - 4.7 - - - - - - - - - 0.16 - - 4.55 - - - - - - - - - 0.2 - - 4.65 - - - - - - - - - 0.35 - - 4.6 - - - - - - - - - 0.478 - - 4.55 - - - - - - - - - 0.5 5.85 5.95 5.85 5.75 5.85 5.95 6.05 5.95 5.9 5.85 6 5.95 0.758 - - 4.8 - - - - - - - - - 1 5.9 5.85 5.8 5.8 5.75 5.75 5.85 5.85 5.9 5.85 5.9 5.9 1.5 5.75 5.7 5.7 5.65 5.7 5.85 5.95 5.9 5.8 5.8 5.85 5.75
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