Research Article
Analytical Solutions for Gas-Water Two-Phase Flow in Multiseam Coalbed Methane Production
Table 4
Physical parameters of coal bed.
| Parameter | Value |
| Young’s modulus of coal (, GPa) | 2.735 | Poisson’s ratio of coal υ | 0.25 | Coal density (, kg/m3) | 1500 | Seam depth (, m) | 521.6 | Seam thickness (, m) | 5.8 | Porosity | 3.51% | Permeability (, mD) | 0.09 | Seam initial pressure (, MPa) | 6.99 | Water viscosity in the ground condition (, Pa·s) | | Gas viscosity under standard atmospheric pressure (, Pa·s) | | Gas density under standard atmospheric pressure (, kg/m3) | 0.425 | Water density under standard condition (, kg/m3) | 0.998 | Formation volume factor of gas | 0.00896 | Formation volume factor of water | 1.0 | The initial gas saturation | 0.73 | Water saturation | 0.27 | Solubility | 1.3 | Relative permeability of gas | 0.3466 | Relative permeability of water | 0.0284 | Seam radius (, m) | 300 |
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