Carbon dioxide gas permeability of coal core samples and estimation of fracture aperture width

摘要: Abstract The structure of cleats, or natural fractures in coal seams, is an important factor affecting gas permeability. Coal seam permeabilities have been classified into fracture and matrix flows. However, seams are generally not regular usually discontinuous. In addition, it difficult to definitively distinguish the permeabilities, measure widths other necessary properties for permeability estimation. Typically has determined by using Darcy equation incompressible fluid flow homogeneous porous media, even if through different characteristics with respect effective stress, which given confined stress minus pressure. this study, measurements were carried out a new procedure methodology estimate width core samples. This measurement method improvement on conventional measuring methods. research, was identified that can be estimated from rates limited small area pipe attachment end surface core. Finally, linear composed presented.