Precise electromagnetic calibration method for orientation of ultra-deep underground pipeline

Abstract

The invention discloses a precise electromagnetic calibration method for the orientation of an ultra-deep underground pipeline. According to the invention, a measuring sensor formed by a three-component orthogonal coil group, a built-in circuit board and a planar electronic compass are arranged in a probe made of a non-metal material, so that electromagnetic calibration of the direction of the ultra-deep underground pipeline relative to the probe is realized. Probes measured through the electromagnetic calibration method are connected through a cable, put down into an exploratory well drilled in advance and connected with a detection host on the ground through serial communication, and measurement parameter setting, process control and measurement result display are completed through the measurement host. In the detection process, the probe is lowered by self gravity, multiple groups of data are collected when approaching the pipeline, the data and probe azimuth data measured by the electronic compass are uploaded to the detection host, and the detection host calculates the position of the target pipeline relative to the exploratory well and displays the position. The method is used in cooperation with an ultra-deep pipeline burying depth measuring device, and can be widely applied to high-precision measurement occasions of ultra-deep underground pipelines and cable positions.

Description

【Technical field】 [0001] The invention relates to a horizontal distance and azimuth electromagnetic detection method of an ultra-deep underground pipeline. The utility model belongs to the application technical field of underground pipeline detection. It integrates sensor production, electromagnetic measurement methods, mathematical calculation methods, embedded systems and other technologies. 【Background technique】 [0002] The electromagnetic method of locating conventionally buried metal pipelines is a well-established technique. The technical principle is: apply a signal transmitter to apply an AC voltage of a certain frequency between the buried pipeline and the ground electrode, transmit the detection signal current to the pipeline to be detected, use the signal receiver to apply the peak / valley detection mode, The route and direction of the pipeline can be accurately positioned on the ground and its buried depth can be measured. The two vertically arranged horizont...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the current commercial magnetic gradient and electromagnetic measurement methods cannot effectively obtain the orientation information of the pipeline relative to the probe in the exploration well during the process of accurately measuring the buried depth of the pipeline

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