Research Article
Two-Phase Flow Model for Numerical Investigation of Impact of Water Retention on Shale Gas Production
Table 1
Marcellus Shale property parameters [
66,
67].
(a) |
| | Reservoir parameter | Value | | Reservoir temperature (°C) | 79.4 | | Fracturing cluster spacing (m) | 92 | | Size of the simulation area (rectangle, m) | | | Fracture permeability in SRV (, m2) | | | Inorganic permeability in SRV (, m2) | | | Fracture porosity in SRV | 0.07 | | Inorganic porosity in SRV | 0.03 | | Shape factor in the inorganic matrix (m−2) | 15 | | Initial water saturation in SRV | 0.05 | | Irreducible water saturation | 0.06 | | Langmuir pressure constant (MPa) | 4 | | Bottom-hole water saturation | 0.1 | | General parameter | Value | | Gas density (kg/m3) | 0.714 | | Coefficient for relative permeability (m) | 0.5 | | Universal gas constant (J/(mol·K)) | 8.314 | | Compressibility of methane (Pa−1) | |
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(b) |
| | Reservoir parameter | Value | | Bottom-hole pressure (MPa) | 3.45 | | Initial gas pressure (MPa) | 32.6 | | Size of SRV (spheroid, m) | | | Fracture permeability in USRV (, m2) | | | Inorganic permeability in USRV (, m2) | | | Fracture porosity in USRV | 0.04 | | Inorganic porosity in USRV | 0.015 | | Surface diffusion coefficient () | | | Initial water saturation in USRV | 0.05 | | Irreducible water saturation | 0.04 | | Langmuir volume constant (m3/kg) | 0.003 | | Biot’s coefficient | 0.8 | | General parameter | Value | | Gas viscosity (Pa·s) | | | Coefficient for capillary pressure () | 2 | | Molar mass of methane (kg/mol) | 0.016 | | Compressibility of methane (Pa−1) | |
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