Method for detecting vertical section of ultra-deep underground pipeline

Abstract

The invention discloses a method for detecting a vertical section of an ultra-deep underground pipeline. The method comprises the following steps: S1, setting a positioning line; S2, determining a central profile; S3, placing a detection instrument; S4, collecting signals; and S5, performing recording and calculating. The detection precision of the vertical profile method is irrelevant to the buried depth of the pipeline, and is only relevant to the horizontal distance between a drill hole and the pipeline. The problem that the detection of an ultra-deep pipeline (the buried depth exceeds 10m)cannot be completed by a conventional detection means or the detection precision cannot meet the requirement can be solved, the precision of ultra-deep pipeline detection is improved, and the detection error is reduced.

Description

technical field [0001] The invention belongs to the technical field of pipeline detection, and in particular relates to a detection method for a vertical section of an ultra-deep underground pipeline. Background technique [0002] Pipeline detection is a common method for detecting the depth of pipelines. Its basic principle is as follows: There are obvious differences in conductivity, magnetic permeability and dielectric constant between various metal pipes or cables and the surrounding media. Such pipes are infinitely long. There is a current-carrying conductor, and an infinitely long current-carrying conductor has a magnetic field in its surrounding space, and this magnetic field can be detected within a certain space range, so if the underground pipeline can carry current and idealize it as an infinitely long-carrying conductor In the detection work, an alternating field source is applied to the metal pipe or cable through the transmitting device, and an induced current ...

AI Technical Summary

Problems solved by technology

[0003] The detection of conventional pipelines is generally effective when the buried depth of the pipeline is less than 5 meters. If the buried depth of the target pipeline is greater than 5 meters or even deeper to 20-30 meters, then the electromagnetic signal captured on the ground is quite flat and weak, which cannot be detected. Rely on conventional methods to determine the plane position and buried depth of ultra-deep pipelines. At this time, the horizontal section observation method must be used for detection. The so-called horizontal section observation method is to set a section line perpendicular to the direction of the target pipeline on a flat ground , the magnetic field signal data is collected step by step, and then the inversion analysis software is used to calculate and analyze the collected data, so as to infer the position and buried depth of the target pipeline. The theoretical basis of the horizontal section observation method is still a single infinitely long wire current conductor, so The target pipeline is buried too deep, and the absolute error of positioning and depth determination is relatively large, which often cannot meet the requirements