Coal seam water injection range monitoring and optimizing method based on acoustic emission array monitoring technology

By setting up an acoustic emission array on coal rock samples and combining CT scanning to reconstruct the structure, monitoring and optimizing the coal seam water injection range, the problem of difficulty in monitoring the coal seam hydraulic fracturing transmission range in the existing technology is solved, and a more accurate coal seam water transmission range is achieved Monitor and optimize.

CN119394858AActive Publication Date: 2025-02-07NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Application Number
CN202411975046.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-02-07
Estimated Expiration
2044-12-31

AI Technical Summary

Technical Problem

The prior art is difficult to monitor the transmission range of coal seam hydraulic fracturing under real three-axis stress conditions, and the acoustic emission technology has insufficient qualitative analysis when monitoring changes in coal rock density.

Method used

The coal seam water injection range monitoring and optimization method is adopted based on acoustic emission array monitoring technology. By setting up acoustic emission array, collecting data, correcting control points, generating three-dimensional envelope images, and comparing them with the pore and crack structures reconstructed by CT scans to verify The accuracy of the algorithm.

Benefits of technology

Continuous monitoring and optimization of the coal seam hydraulic fracturing transmission range is achieved, the accuracy of envelope results is improved, and the actual measurement results are more realistically approached.

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Abstract

A coal seam water injection range monitoring and optimizing method based on an acoustic emission array monitoring technology comprises the steps that an acoustic emission array is arranged on a coal rock pattern, a monitoring path network is established, and then data are collected based on the monitoring path network; confirming characteristic signal data of the water transmitted to the monitoring path; enveloping a water delivery contour line based on the characteristic signal data; the control points are corrected and adjusted through a water conveying correction control point algorithm and a fracture structure correction control point algorithm in sequence; performing envelope processing again based on the corrected control points to generate a three-dimensional envelope image of the water injection coal sample water transmission position; and the accuracy of the algorithm is verified by comparing with pore and crack structures reconstructed by computed tomography. According to the method, collected control points are corrected according to the complex fracture structure of the coal rock; the accuracy of an envelope result is improved; the crack correction algorithm is more accurate and more truly close to an actual measurement result, and the accuracy of an envelope result is improved.
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Citation Information

Patent Citations

  • Water protection mining "acoustic emission-infrared radiation" experimental system with seepage device

    CN110221036A

  • Water injection coal sample wetting range monitoring experiment method based on ultrasonic transducer array

    CN118746621A