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A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
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Anisotropic Flow-Solid Coupling Model for Gas Extraction from Cis-Layer Boreholes and Its Application.

Jiajia Liu1,2,3,4, Mengqi Shen1, Xuchao Huang2

  • 1School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo454003, Henan, China.

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Summary
This summary is machine-generated.

Coal anisotropy significantly enhances gas pressure drop in cis-borehole extraction, leading to faster gas removal. Understanding these anisotropic effects is crucial for optimizing coal mine gas extraction efficiency and safety.

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Area of Science:

  • * Mining Engineering
  • * Geomechanics
  • * Fluid Dynamics

Background:

  • * Coal seams exhibit structural anisotropy, influencing fluid flow.
  • * Effective gas extraction is vital for mine safety and productivity.
  • * Previous models often simplified coal permeability, neglecting anisotropy.

Purpose of the Study:

  • * To investigate the impact of coal body anisotropy on gas extraction.
  • * To establish a permeability model considering structural anisotropy.
  • * To analyze gas pressure changes in relation to extraction parameters.

Main Methods:

  • * Development of an anisotropy permeability model for coal.
  • * Implementation of a flow-solid coupling model.
  • * Utilization of COMSOL numerical simulation software.
  • * Analysis of gas pressure variations in different stratigraphic directions.

Main Results:

  • * Gas pressure decreases more rapidly when coal anisotropy is considered.
  • * Extraction time, negative pressure, and borehole diameter show functional relationships with effective extraction radius.
  • * Gas pressure decline is faster in parallel stratigraphic directions than in vertical ones.
  • * A 30% redundancy factor aids in determining safe gas pressure drop parameters.

Conclusions:

  • * Coal anisotropy is a critical factor in cis-borehole gas extraction efficiency.
  • * The established models provide insights into gas migration and pressure dynamics.
  • * Incorporating anisotropy and redundancy factors enhances extraction planning and safety.