Research Article
A Two-Phase Flowback Model for Multiscale Diffusion and Flow in Fractured Shale Gas Reservoirs
Table 1
Model parameters for Barnett shales.
| Parameter | Unit | Value | Physical meanings |
| | | 0.15 | Residual saturation of gas | | | 0.6 | Residual saturation of water | | Pas | | Water viscosity | | | 2 | Pore size distribution index | | | 2 | Corey parameter for water | | | 2 | Corey parameter for gas | | MPa | 20.34 | Initial reservoir pressure | | m | 47.2 | Fracture half-length | | MPa | 3.45 | Well pressure | | mD | 0.7 | Initial permeability in fractured zone | | | 0.2 | Initial porosity in fractured zone | | mD | 50 | Permeability in hydraulic fracture | | | 0.25 | Porosity in hydraulic fracture | | | 0.03 | Initial porosity in microfracture of matrix | | | 0.01 | Initial porosity in matrix | | | 14 | Number of hydraulic fractures | | MPa | 2 | Entry capillary pressure | | | 0.3 | Poisson’s ratio of shale | | kg/m3 | 2300 | Shale density | | MPa | 6 | Langmuir pressure of gas in shale | | m3/kg | 0.03 | Langmuir sorption capacity of shale for gas | | | 0.9 | End-point relative permeability for water phase | | | 1 | End-point relative permeability for gas phase | T | K | 352 | Reservoir temperature | | m | | Aperture of microfracture in matrix | | m | | Diameter of pore in matrix | | m | 0.003 | Hydraulic fracture width |
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