井中磁梯度法在探测深埋铁磁性管道中的技术应用

Technology Application of Borehole Magnetic Gradient Method on Deeply Buried Ferromagnetic Pipeline Detection

常规物探方法很难对深埋铁磁性管道的平面位置和埋深进行精准探测。通过工程实例,运用井中磁梯度法和钻孔触探验证,探测出跨河并行管道的平面位置和埋深。研究表明,距管道不同位置的磁测曲线会随着距离的变化呈现出不同特征,充分验证了井中磁梯度法探测深埋铁磁性管道的有效性和准确性,但需结合其他探测手段才能提高探测效率。分析探讨了不同管径管道在相同探测位置的磁异常反应特征和仪器本身的磁异常影响范围,为今后快速、精确探测不同管径的深埋铁磁性管道提供借鉴。

It is difficult to accurately detect the plane position and buried depth of deeply buried ferromagnetic pipelines by conventional geophysical methods.The plane position and buried depth of the parallel pipelines across the river are detected by borehole magnetic gradient method and borehole penetration.The results showed that the magnetic curves at different positions from the pipeline presented different characteristics with the change in distance,which verified the effectiveness and accuracy of the borehole magnetic gradient method in detecting deeply buried ferromagnetic pipelines.However,other detection methods are needed to improve the detection efficiency.The magnetic anomaly response of pipelines with different diameters in the same detection position and the magnetic anomaly range of the instrument are analyzed,which provides reference for the rapid and accurate detection of ferromagnetic pipelines with different diameters.