Effect of the Angle between Hydraulic Fracture and Natural Fracture on Shale Gas Seepage

Table 1

Basic parameters of shale reservoir and shale gas [29] and [30]

Parameter	Value	Unit
Reservoir temperature	333.15	K
Length of reservoir	400	m
Width of reservoir	480	m
Natural fracture width	0.002	m
Hydraulic fracture width	0.005	m
Matrix permeability	5.622 × 10^−3	mD
Natural fracture permeability	1.5 × 10^9	mD
Hydraulic fracture permeability	2.5 × 10^9	mD
Matrix compressibility	3 × 10^−4	MPa^−1
Natural fracture compressibility	2.5 × 10^−4	MPa^−1
Hydraulic fracture compressibility	4 × 10^−4	MPa^−1
Matrix porosity	2	%
Natural fracture porosity	0.4	%
Hydraulic fracture porosity	0.4	%
Initial reservoir pressure	30	MPa
Half-length of hydraulic fracture	200	m
Half gas flow rate	3000	m^3/d
Reservoir thickness	38	m
Gas density on ground	0.717	kg/m^3
Gas density underground	176.794	kg/m^3
Langmuir volume	2	m^3/t
Molecular weight of methane	16	g/mol
Gas constant	8.34	J/(K·mol)
Langmuir pressure	10	MPa
Shape factor	0.76	m^−2
Deviation coefficient of methane	0.89	/
Viscosity of methane	0.0004P + 0.0119	mPa·s