Geofluids / 2020 / Article / Tab 1

Review Article

A Fully Coupled Hydromechanical Model for CO2 Sequestration in Coal Seam: the Roles of Multiphase Flow and Gas Dynamic Diffusion on Fluid Transfer and Coal Behavior

Table 1

Parameters implemented in the simulator.

Valuable (parameter)ValueUnits

(initial CO2 diffusion coefficient)m2/s
(attenuation coefficient)-
(temperature)293K
(density of coal)1650kg/m3
(Langmuir volume constant)0.045m3/kg
(Langmuir pressure constant)0.6MPa
(average distance between coal fractures)0.005m
(water residual saturation)0.2-
(gas residual saturation)0.1-
(the coefficient in Eq. (11))0.65-
(initial Young’s modulus of coal)4GPa
(Poisson’s ratio of coal with no overpressure)0.285-
(Langmuir strain constant)0.03-
(initial fracture porosity)0.03-
(initial permeability)m/s
(porosity of coal matrix)0.01-
(initial water saturation)0.6-
(CO2 injection rate)m2/s
(water injection rate)m2/s

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