Coal seam permeability improvement method by electric field excited ionic liquid propellant in-situ fracturing

By using an electric field-excited ionic liquid propellant in-situ fracturing method, a multi-point synergistic three-dimensional fracture network is formed in the coal seam, which solves the problems of limited energy range and low fracture network complexity in existing technologies. This achieves efficient coal seam permeability enhancement and is suitable for the stimulation of deep and low-permeability coal seams.

CN122129234APending Publication Date: 2026-06-02ZHONGBEI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHONGBEI UNIV
Filing Date
2026-03-31
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing hydraulic fracturing and high-energy propellant fracturing technologies have limitations in coalbed methane development, including limited energy application range, low fracture network complexity, high water consumption, high cost, and poor adaptability, making it difficult to achieve large-area coal seam permeability enhancement.

Method used

The in-situ fracturing method using electric field-excited ionic liquid propellant involves arranging power supply and measurement electrodes in the coal seam and using DC and high-frequency alternating electric fields to drive the ionic liquid propellant to distribute and pyrolyze within the coal seam, forming a multi-point synergistic three-dimensional fracture network, thereby achieving large-scale and efficient coal seam permeability enhancement.

Benefits of technology

It forms a high-density three-dimensional fracture network, which significantly improves the permeability of coal seams and solves the problems of limited energy application range and low fracture network complexity in existing technologies. It is suitable for the stimulation of deep and low-permeability coal seams and reduces costs and energy consumption.

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Abstract

This invention provides a method for enhancing coal seam permeability through in-situ fracturing using an electric field-excited ionic liquid propellant. The method involves constructing an injection well and a monitoring well in the target area, and installing power supply electrodes A and B, and test electrodes A and B, respectively. Ionic liquid propellant is injected into the injection well. A DC electric field is applied to drive the ionic liquid propellant towards the monitoring well, filling the microfractures in the coal seam. The inter-well impedance is monitored in real time, and the rate of change of inter-well impedance is used to determine whether the ionic liquid propellant has reached a predetermined distribution state. A high-frequency alternating electric field is switched to cause dielectric loss and temperature rise in the polar molecules within the fractures. When the local temperature reaches the pyrolysis threshold, the ionic liquid propellant undergoes multi-point synergistic pyrolysis, releasing high-pressure gas. This high-pressure gas synergistically expands the fracture network from multiple points, forming a complex three-dimensional fracture flow network. After fracturing, coalbed methane extraction is performed. This method is convenient to implement, has low implementation cost, provides ideal permeability enhancement, and has high permeability enhancement efficiency, effectively improving the permeability of the coal seam.
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