Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs

Table 7

Stress sensitivity of fractured tight sandstone gas reservoir in the study area.

Core	Core number	Permeability (10^-3 μm^2)			Damage rate of permeability (%)
		2.5 MPa	20 MPa	2.5 MPa
Matrix core	111	0.0249	0.0096	0.0115	25.84
	129	0.0106	0.0036	0.0083	21.80
Fracture core	115	27.4762	1.4855	3.6195	86.83
	119	12.3547	0.5964	1.1564	90.64