Oil and gas pipeline defect three-dimensional imaging method and system based on magnetic flux leakage detection

By using data processing and magnetic charge models based on magnetic flux leakage detection, the problems of insufficient signal stability and poor imaging effect in traditional oil and gas pipeline detection systems have been solved, enabling accurate identification and quantification of pipeline defects and improving the accuracy and reliability of detection.

CN121029048APending Publication Date: 2025-11-28四川文理学院
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Patent Information

Application Number
CN202511127046.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-13
Publication Date
2025-11-28

AI Technical Summary

Technical Problem

Traditional oil and gas pipeline inspection systems suffer from insufficient signal stability, poor imaging of complex defects, and difficulty in fully reflecting the true state of defects, leading to assessment bias.

Method used

By reading leakage magnetic field detection data, preprocessing is performed to calculate physical coordinates, setting high and low thresholds to identify abnormal signal areas, merging adjacent or overlapping areas to form independent defects, using a magnetic charge model to predict the magnetic field and normalize it, and receiving defect parameters input by the user to perform three-dimensional inversion quantification of defect features.

Benefits of technology

It enables accurate identification and quantification of defects in oil and gas pipelines, provides intuitive 3D views and thermal maps, improves the accuracy and completeness of detection, and provides a reliable basis for pipeline maintenance.

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Abstract

According to the oil and gas pipeline defect three-dimensional imaging method and system based on magnetic flux leakage detection, original data are converted into magnetic field intensity units with physical significance, physical coordinates are calculated, meanwhile, an automatic defect detection and merging algorithm is adopted, abnormal areas can be accurately recognized, and independent defect marks can be formed. In the detection process, through an overall three-dimensional view, a defect thermodynamic diagram and three-dimensional imaging of a specific defect area, the position, form and magnetic field signal characteristics of the defect can be visually displayed, the defect size can be further quantified in combination with a defect three-dimensional inversion function, and a reliable basis is provided for accurate evaluation and maintenance of oil and gas pipeline defects.
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