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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