Multi-dimensional monitoring feedback pulse wave-extraction solvent synergic coal seam permeability enhancement method

By employing a multi-dimensional monitoring and feedback-based pulse wave-extraction solvent synergistic method, combined with high-pressure pulse waves and stepwise pressurization of the solvent, the problem of micropore and macro fracture propagation in low-permeability coal seams has been solved, achieving safe and efficient coal seam permeability enhancement and gas extraction.

CN122129225APending Publication Date: 2026-06-02TAIYUAN UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIYUAN UNIVERSITY OF TECHNOLOGY
Filing Date
2026-03-26
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies are insufficient to simultaneously and effectively expand micropores and macro fractures in low-permeability coal seams. Traditional permeability enhancement methods are inefficient and pose risks of corrosion to downhole equipment and environmental pollution.

Method used

A multi-dimensional monitoring and feedback pulse wave-extraction solvent synergistic method is adopted. By arranging pulse wave holes in a cross pattern and injecting extraction solvent, combined with high-pressure pulse waves and step-by-step pressurization of solvent, the permeation process is monitored and controlled in real time, forming a macroscopic fracture network and a microscopic dissolution effect.

Benefits of technology

It significantly improves the permeability of coal seams and the efficiency of gas extraction, reduces the risk of corrosion and pollution, and achieves safe and efficient coal seam permeability enhancement and gas control.

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Abstract

This invention discloses a multi-dimensional monitoring and feedback-based pulse wave-extraction solvent synergistic method for enhancing coal seam permeability, relating to the field of coalbed methane extraction and gas control technology. By alternately injecting and maintaining pressure with extraction solvent and discharging high-voltage pulse waves into the coal seam borehole, the high polarizability and permeability of the extraction solvent are utilized to extract organic matter from the coal, expanding the pore network. Applying high-voltage pulse waves generates plasma shock waves to synergistically expand fractures, significantly improving coal seam permeability. To achieve this method, an integrated pipeline combining injection channels, hydraulically driven electrodes, and borehole sealing functions is used, coupled with a system capable of step-by-step pressurization and multi-dimensional monitoring and feedback, enabling precise process control. This method significantly expands the coal seam fracture network, improves permeability, and uses environmentally friendly solvents to reduce equipment corrosion and environmental pollution risks, ensuring efficient and safe gas extraction. It overcomes the problems of strong corrosiveness and low efficiency of traditional acidizing solutions, and is particularly suitable for gas extraction from low-permeability coal seams.
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