The present work was carried out to investigate the effect of pore structure on non-Darcy gas flow to enable a better understanding of the relationship between the inertial coefficient and various rock properties. Measurements of porosity, permeability, inertial coefficient and capillary pressure were made on some 40 core samples, as well as visual observations under optical and scanning microscopes.

The results obtained using this integrated approach helped to explain the wide scatter observed in conventional inertial coefficient – permeability correlation plots. It is shown that the inertial effect is not only a function of porosity and permeability, but is also controlled by other factors such as aspect ratio, coordination number, heterogeneities, surface roughness etc.

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