Non-Darcy Flow in Hydraulic Flushing Hole Enlargement-Enhanced Gas Drainage: Does It Really Matter?

Figure 3

Non-Darcy flow coefficients for different reservoir rocks and coal permeability evolution during progressive deformation [7, 12].

(a) Non-Darcy flow coefficients for different reservoir rocks after Friedel and Voigt [12]

(b) Deviatoric stress and permeability versus axial strain after Wang et al. [7]