Coal seam mining method based on directional drilling hydraulic fracturing pressure relief and gas extraction

By using directional drilling hydraulic fracturing and negative pressure ventilation technology, the problems of rock bursts and gas accumulation in deep coal seam mining have been solved, improving mining efficiency and safety, and realizing efficient utilization of gas and environmentally friendly power generation.

CN120575866BActive Publication Date: 2026-05-26CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Filing Date
2025-06-18
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Deep coal seams are prone to rock bursts and gas accumulation during mining. Existing technologies are unable to effectively reduce drilling operations, improve borehole utilization and ventilation efficiency, resulting in reduced production efficiency and increased safety hazards.

Method used

Directional drilling is used for hydraulic fracturing and gas extraction. Combined with negative pressure ventilation technology, horizontal and vertical sections are constructed in the coal seam through directional drilling to achieve full-area decompression and pre-extraction. The surface negative pressure ventilation system is used to reduce ventilation interference and improve ventilation quality.

Benefits of technology

It improved coal seam mining efficiency, reduced operating costs, enhanced worker safety, reduced the health impact of gas and coal dust on workers, and enabled the environmentally friendly power generation utilization of gas.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention belongs to the field of coal mine rockburst and gas control, specifically involving a coal seam mining method based on directional drilling and hydraulic fracturing for depressurization and gas extraction. The method includes tunneling and hauling uphill, while simultaneously conducting depressurization and pre-gas extraction of the entire first mining face area through directional drilling from the surface. Then, negative pressure ventilation is implemented through the directional drilling on the surface. After the hauling and uphill tunneling is completed, the first mining face can be started immediately, with simultaneous return air tunneling. This significantly improves the timing and efficiency of starting the first mining face, allowing for faster recovery and cost reduction. Furthermore, during negative pressure ventilation at the surface using directional drilling, the gas and coal dust generated at the tunneling face flow with the airflow through the directional drilling to the surface, minimizing health impacts on workers at the tunneling face and greatly improving the safety of the working environment.
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