Prediction of Production Performance of Refractured Shale Gas Well considering Coupled Multiscale Gas Flow and Geomechanics

Table 1

Reservoir and fracture parameters used in this simulation.

Parameters	Values	Units	Parameters	Values	Units
Number of initial fracturing stage	16	—	Cluster number	3	—
Length of horizontal well	1600	m	Cluster spacing	30	m
Well radius	0.1	m	Fracture permeability in stimulated area	0. 01	mD
Bottom-hole flowing pressure	3	MPa	Hydraulic fracture conductivity	0.2	D·cm
Initial reservoir pressure	21	MPa	Hydraulic fracture half-length	100	m
Reservoir temperature	80	°C	Bandwidth of SRV per cluster	6	m
Number of refractured fractures	32	—	Stress sensitivity coefficient	0.01	MPa^-1
Shape factor of kerogen system	32	1/m^2	Porous medium tortuosity	5	—
Fracture spacing in SRV	1	m	Reservoir height	40	m
Natural fracture porosity	0.001	—	Langmuir volume		m^3/kg
Total matrix porosity	0.05	—	Langmuir pressure	5	MPa
The portion of the kerogen pore volume in total matrix pore volume	0.25	—	Shale density	2600	kg/m^3
Initial pore radius in inorganic matrix	10	nm	Gas molecular mass	0.016	kg/mol
Initial pore radius in kerogen	2	nm	Surface diffusion coefficient		m^2/s
Overburden stress	40	MPa	Material constant	0.04	—
Poisson’s ratio	0.2	—	Horizontal minimum principal stress	37	MPa
Horizontal maximum principal stress	41	MPa	Elastic modulus	25	GPa
Langmuir volume strain	0.001	—	Net pressure of open fracture	3.5	MPa