Research Article
Effects of Borehole Arrangement on Methane Migration and Implications for High Efficiency Extraction in Intact and Tectonic Combined Coal Seams
Table 1
Constant parameters used in the simulation model.
| | Parameters | Value |
| | Porosity of coal, | 0.06 | | Density of intact coal sublayers, | 1449 kg/m3 | | Langmuir volume constant of intact coal sublayers, | 14.665 cm3/g | | Langmuir pressure constant of intact coal sublayers, | 1.115 MPa | | Young’s modulus of intact coal sublayers, | 3380 MPa | | Poisson’s ratio of intact coal sublayers, | 0.33 | | Density of tectonic coal, | 1407 kg/m3 | | Langmuir volume constant of tectonic coal, | 9.41 cm3/g | | Langmuir pressure constant of tectonic coal, | 0.861 MPa | | Young’s modulus of tectonic coal, | 1500 MPa | | Poisson’s ratio of tectonic coal, | 0.31 | | Extraction pressure, | 88 kPa | | Initial gas pressure, | 2 MPa | | Gas density at standard conditions, | 0.707 kg/m3 | | Molar mass of gas, | 16 g/mol | | Universal gas constant, | 8.314 J/(molK) | | Thermodynamic temperature, | 293 K | | Dynamic viscosity of gas, | | | Module of pore bulk, | 307 MPa | | Maximum sorption-induced volume strain, | 0.025 |
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