Long conveyance pipe defect positioning method and positioning system

Abstract

The invention relates to a positioning method and a positioning system for a long-distance pipeline defect. In the method for locating defects of long-distance pipelines according to the present invention, a series of butt girth welds are formed in the long-distance pipelines during installation, and wheel-type odometers are used for mileage measurement and positioning in long-distance pipelines. When the wheel-type mileage While the meter is advancing and measuring the mileage in the long-distance pipeline, the eddy current testing device is used to detect when the butt girth weld has passed. This information is analyzed simultaneously with the mileage data of the wheel odometer to determine the pipeline defect s position. The long-distance pipeline defect location system of the present invention includes a wheel odometer and an eddy current detection device; the eddy current detection device includes an eddy current coil and an eddy current detection processing module connected with the eddy current coil. The positioning method and system of the invention can avoid the increase of the accumulative distance error of the wheel odometer, improve the positioning accuracy, and fully meet the positioning requirements.

Description

technical field [0001] The invention relates to a pipeline internal detection method and device, in particular to a long-distance pipeline defect positioning method and positioning system. Background technique [0002] Long-distance oil and gas pipelines have been corroded after years of operation, affecting operation and even endangering the environment. Therefore, it is necessary to regularly detect the corrosion and deformation of the pipeline from the inside of the pipeline, and record the location, depth, area and other information of the corrosion. The technicians will evaluate the integrity based on the test results and determine whether it needs to be repaired or replaced. [0003] At present, the following methods are usually used at home and abroad to determine the corrosion location in long-distance pipelines: [0004] (1) Use the position information provided by the wheel odometer to determine the position of the corrosion in the direction of the pipeline axis. ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of this method is to solve the problem that only using the wheel-type odometer has a large error and the cost of using the combination of the magnetic device and the wheel-type odometer is expensive, and it is difficult to significantly improve the positioning accuracy. The positioning method and positioning system of long-distance pipeline defects with the precision and accuracy of defect positioning

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