Gas Drainage Techniques and Methane Management in Coal Mining
Summary
Effective gas drainage and methane management are central to safe and sustainable coal mining. Methane accumulation in underground workings presents a dual challenge: ensuring miner safety by preventing explosive atmospheres and mitigating greenhouse gas emissions. Pre-drainage approaches employ directional drilling of boreholes into coal seams ahead of excavation, extracting gas under controlled conditions. Techniques include in-seam and cross-seam boreholes, hydraulic fracturing to enhance permeability, and secondary sealing to restore borehole integrity under changing stress regimes. Numerical and inversion models now allow dynamic assessment of gas pressure and content, informing drill spacing and extraction schedules. Sealing technologies—ranging from cement mortars to expandable polymer composites and high-water-content slurries—are optimised to prevent air ingress, maintain negative pressure differentials and maximise gas concentration. Collected methane is either vented through surface facilities or captured for power generation and industrial use, reducing reliance on fossil fuels and lowering the carbon footprint of mining operations. Continuous monitoring, including pressure measurement and microseismic techniques, supports adaptive management of gas outbursts, ensuring operational resilience in deep and complex coal seams worldwide.
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Gas Drainage Techniques and Methane Management in Coal Mining publication trend
The graph below shows the total number of articles in gas drainage techniques and methane management in coal mining across all publications each year (not limited to Nature Index journals).
Technical terms
Gas drainage borehole: A drilled hole designed to extract methane from coal seams before or during mining.
Inversion model: A computational method that derives subsurface gas pressure or content from measured gas emission rates and field data.
Sealing depth: The length of borehole section filled with grout or other material to prevent air leakage and maintain negative pressure.
Negative pressure: A suction force applied to a borehole that draws gas from the coal seam into the drainage system.
Plastic zone: The region of coal surrounding an excavation or borehole where irreversible deformation has occurred under stress.
References
- Study and application of a continuous inversion model of coal seam gas pressure in front area of heading face. International Journal of Coal Science & Technology (2023).
- Study on the influence mechanism of air leakage on gas extraction in extraction boreholes. Energy Exploration & Exploitation (2022).
- Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage. International Journal of Coal Science & Technology (2021).
- Dynamic Secondary Borehole‐Sealing Method for Gas Drainage Boreholes along the Coal Seam. Geofluids (2018).
- Sealing Behavior and Flow Mechanism of Expandable Material Slurry with High Water Content for Sealing Gas Drainage Boreholes. Geofluids (2018).
- Preparation and Sealing Performance of a New Coal Dust Polymer Composite Sealing Material. Advances in Materials Science and Engineering (2018).
- Fracture propagation induced by hydraulic fracturing using microseismic monitoring technology: Field test in CBM wells in Zhengzhuang region, Southern Qinshui Basin, China. Frontiers in Earth Science (2023).
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