Effects of Injection Pressure and Duration on Alternate High-Pressure Water-Gas Sequestration of Coalbed Methane

Table 1

Coal seam parameters.

Symbol	Parameter	Value	Unit
	Coal density	1250	Kg/m^3
	Initial porosity	0.03	1
	Initial permeability	3.8e-16	m^2
	Methane standard density	0.7	Kg/m^3
	Air density	1.293	Kg/m^3
	Water density	0.9814	Kg/m^3
	Methane viscosity	1.84e-5	Pa·s
	Air viscosity	1.79e-5	Pa·s
	Water viscosity	0.96e-3	Pa·s
	Injection pressure	15	MPa
	Boundary pressure	2	MPa
	Initial seam pressure	2	MPa
	Reference temperature	20	°C
	Initial water saturation	0.1	1
	Initial air saturation	0.05	1
	Initial methane volume fraction	0.85	1