Array type transient electromagnetic sleeve damage detection instrument and method

CN120908289APending Publication Date: 2025-11-07XI'AN PETROLEUM UNIVERSITY
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Patent Information

Application Number
CN202511137603.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-14
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve high-resolution, precise spatial positioning and quantification in casing damage detection, particularly in their inability to distinguish fine defects such as microcracks and pitting, thus failing to meet the refined requirements of modern wellbore integrity management.

Method used

An array-type transient electromagnetic method was adopted, and a downhole detection instrument combining transient electromagnetic method and array-type sensor was designed. An array-type probe that surrounds the well wall in 360° was designed. Multiple independent small-radius coils were closely attached to the well wall, and full coverage detection was achieved through a detection array with equal angular spacing. The combination of small loop coil structure and coaxial design of transmitting and receiving coils improved the signal-to-noise ratio and detection accuracy.

Benefits of technology

It enables high-resolution measurement of casing damage, accurately locates the damage position, improves the comprehensiveness of detection and positioning accuracy, and meets the high-level safety assurance requirements of modern wellbore integrity management.

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Abstract

The invention discloses an array type transient electromagnetic sleeve damage detection instrument and method. The instrument comprises a supporting module; the supporting module comprises a first metal rod and a second metal rod, the upper end and the lower end of the first metal rod are symmetrically arranged, and the lower end of the first metal rod is connected with an electric control module. An array type electromagnetic detection module is arranged between the upper end of the second metal rod and the motor and used for being close to the well wall to transmit and receive signals and transmitting the received signals to an electric control module 3 for data processing, and the damage condition of the casing pipe of the oil and gas well is judged. Coil system parameters are optimized by establishing a borehole-casing-cement sheath-stratum four-layer wellbore model; quantitatively analyzing the influence of the distance between the instrument system and the well wall on a response signal; comparing induced electromotive force characteristics under the current with different waveforms and amplitudes; parameters such as casing conductivity, casing magnetic conductivity and cement sheath conductivity are obtained, and casing damage is identified; according to the invention, the casing damage three-dimensional positioning capability and the microdefect identification sensitivity are obviously improved.
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Citation Information

Patent Citations

  • An array transient electromagnetic method multi-layer pipe string damage detection system and method

    CN106596715B

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  • Metal pipeline flaw detection method

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