Experimental Investigation on Propagation Behavior of Hydraulic Fractures in Coal Seam during Refracturing

Table 1

Petrophysical properties of the testing coal.

Parameter	Value
Porosity (%)	8.44
Permeability (10^-3 mD)	1.91
Poisson’s ratio perpendicular to BP	0.417
Poisson’s ratio parallel to BP	0.407
Young’s modulus perpendicular to BP (GPa)	6.03
Young’s modulus parallel to BP (GPa)	5.65
Tensile strength perpendicular to BP (MPa)	2.71
Tensile strength parallel to BP (MPa)	2.34
Compressive strength perpendicular to BP (MPa)	93.78
Compressive strength parallel to BP (MPa)	79.98