Research Article
Study on Permeability Improvement Technology by Injecting Air into the Gas Drainage Borehole in Low-Permeability Coal Seam
Table 1
Parameters for coal and gas in need.
| Parameter | Value |
| Density of coal body, | 1.38 × 103 kg·m−3 | Porosity of coal body, | 0.0320 | Permeability of coal body, | 1.35 × 10−17 m2 | Density of CH4 in the standard condition, | 0.717 kg·m−3 | Dynamic viscosity coefficient of CH4, | 1.03 × 10−5 Pa·s | Ultimate adsorption capacity of CH4 | | In coal seam adsorption alone, | 0.03832 m3·kg−1 | Adsorption equilibrium constant of CH4, | 0.51 MPa−1 | Density of N2 in standard condition, | 1.25 kg·m−3 | Dynamic viscosity coefficient of N2, | 1.69 × 10−5 Pa·s | Ultimate adsorption capacity of N2 | | In coal seam adsorption alone, | 0.01658 m3·kg−1 | Adsorption equilibrium constant of N2, | 0.46 MPa−1 | Pressure of gas in standard condition, | 0.101325 MPa |
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