Method and device for non-excavation detection of pipe body defects in buried pipelines

Abstract

A non-excavation detection method and device for buried pipeline body defects belong to the field of detection methods and devices of buried pipelines. The non-excavation detection method for buried pipeline body defects comprises: a detection device obtains, on the basis of a magnetic gradient tensor and a magnetic field vector value, a distance value between a pipe body defect point and a ground measurement point; and on the basis of the distance value between the pipe body defect point and the ground measurement point and the magnetic field vector value, the detection device obtains a pipe body defect magnetic moment, so as to quantitatively evaluate the level of the pipe body defect.

Description

technical field [0001] The invention relates to the field of detection methods and equipment for buried pipelines, in particular to a non-excavation detection method for pipe body defects of buried pipelines and a device for realizing the detection method. Background technique [0002] Pipeline transportation is the main transportation mode of oil and natural gas, and long-distance oil and gas pipelines on land are generally laid underground. Buried oil and gas pipelines are affected by soil and transmission medium corrosion, fatigue, natural disasters, illegal construction, drilling and theft during operation, and are prone to corrosion, deformation, cracking, leakage, combustion, explosion and other accidents. To ensure the safe operation of oil and gas pipelines , it is necessary to detect and discover pipeline defects in time and evaluate their impact on pipeline safety. The detection of buried oil and gas pipelines is divided into internal detection and external detect...

AI Technical Summary

Problems solved by technology

The detection of buried oil and gas pipelines is divided into internal detection and external detection: (1) internal detection is to place the detection instrument inside the pipeline and use the pressure of the pipeline to complete the detection. There are restrictions, the pipe needs to be pigged before the inspection, the inspection cost is high, and there is a risk of pipe blockage

(2) External detection is to place the detection instrument outside the pipeline. According to whether the instrument is in direct contact with the pipeline body, it is divided into excavation detection and non-excavation detection. Among them, the excavation detection is a destructive detection that requires excavation, stripping Removing the anti-corrosion (insulation) layer of the pipeline, testing, covering the pipeline, backfilling, etc., requires a large amount of work, takes a long time, and the reliability of the evaluation is related to the excavation of the pipe section

[0004] The above-mentioned magnetic method detection has the following defects: (1) The detection accuracy is related to the sensitivity of the magnetic sensor; (2) In addition to gradient processing and derivative conversion, more complete data processing methods are needed to suppress the geomagnetic field, pipeline magnetic field and other interfering magnetic fields , and highlight the defect magnetic field; (3) lack of effective data analysis methods, can not quantitatively analyze the tube defects; (4) downward continuation is an ill-posed problem, there is no rigorous and accurate theoretical calculation method, and the downward continuation has high-pass filtering characteristics, local noise and interference will be amplified, making the downward continuation calculation fail

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