孔中磁梯度法在超深金属管道探测中的应用

Application of Downhole Magnetic Gradient Method in Locating of Deeply Burred Metal Pipelines

近年来,随着城市建设速度的高速发展,管道的新建、改建、扩建日益频繁。一般地下管道埋深通常较浅,常规的探测方法就可以实现对其准确定位,但是对于超深金属管道探测一直是个难题,由于超深管道一般都是采用定向钻等施工的非开挖管道,施工过程往往无法准确的控制管道的走向及埋深,现有的物探手段难以准确的查明管道的平面位置与埋深,通过工程实例,通过多种方案对比,最终采用PCM+防腐检测仪进行初步定位,孔中磁梯度仪精确探测手段,解决了超深金属管道探测问题,并取得了良好效果。

In recent years, with the rapid development of city construction, pipelines have frequently been newly installed, relocated, and expanded. In general, embedment depth of the underground pipelines is usually relatively shallow, so the conventional methods can usually accurately locate them. However, locating the deeply buried metal pipes is a challenge since these deeply buried metal pipelines are often installed using the trenchless technologies such as microtunneling with large embedment depth up to 20 meters below the ground surface. Frequently, the embedment depth and orientation of the trenchless installed pipelines could not always accurately controlled. Therefore, the conventional geophysical shallow buried pipeline locating methods could not be effectively and accurately used in the deeply buried metal pipelines for their horizontal and vertical locations. Based on the comparison of several pipeline location methods, the downhole magnetic gradient method plus the corrosion detection apparatus was used in the locating of deeply buried metal pipes. The results were satisfactory.