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Experimental Study on Coal Gas Desorption Characteristics at Different Pressures at the Initial Stage of Borehole Drilling

  • 0State Key Laboratory for Safe Mining of Deep Coal and Environment Protection, Anhui University of Science and Technology, Huainan 232001, China.
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July 14, 2025

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July 14, 2025

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Summary

This summary is machine-generated.

Laboratory experiments reveal that increased coal seam gas pressure leads to higher borehole gas emissions. Initial gas emission follows an exponential decay model, with velocity stabilizing over time, especially at higher pressures.

Area Of Science

  • Mining Engineering
  • Geotechnical Engineering
  • Coal Science

Background

  • On-site experiments for underground coal mine borehole gas emissions face significant constraints.
  • Existing laboratory systems often lack realistic borehole and drill bit parameters, affecting gas emission characteristic studies.
  • Coal and gas outburst risk is directly influenced by coal seam gas pressure.

Purpose Of The Study

  • To develop a physical simulation experimental system for coal borehole drilling that mimics field conditions.
  • To investigate the characteristics of gas emissions from boreholes under varying coal seam gas pressures.
  • To provide a reliable experimental basis for studying gas emissions in coal mining operations.

Main Methods

  • Developed a novel physical simulation experimental system with parameters approximating actual coal mining boreholes and drill bits.
  • Conducted experiments on gas emissions from boreholes under controlled, varied adsorption pressure conditions.
  • Analyzed gas emission volume, initial emission model, and emission velocity stabilization times.

Main Results

  • Gas emission volume from boreholes increases proportionally with adsorption equilibrium pressure.
  • The initial gas emission pattern was accurately modeled using an exponential decay function.
  • Gas emission velocity initially increased before reaching a stable state, with longer stabilization times observed at higher pressures.

Conclusions

  • The developed experimental system accurately simulates field conditions for studying borehole gas emissions.
  • Higher coal seam gas pressures result in greater gas emissions and influence emission dynamics.
  • The findings provide crucial data for understanding and mitigating coal and gas outburst risks.