Topic
Permeability (earth sciences)
About: Permeability (earth sciences) is a research topic. Over the lifetime, 15424 publications have been published within this topic receiving 288535 citations.
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TL;DR: In this paper, the effect of temperature on oil shale pyrolysis and the creation of pore volume during thermal treatment was investigated using three-dimensional X-ray micro tomography (XMT).
229 citations
TL;DR: In this paper, the authors used a cut-and-random-rejoin-type model of the medium and showed that the porosity reduction for a given volume of biomass is greatest when the porous medium has uniform pore sizes.
Abstract: Growth of a biofilm in a porous medium reduces the total volume and the average size of the pores. The change in the pore size distributions is easily quantified when certain geometric assumptions are made. Existing models of permeability or of relative permeability can be manipulated to yield estimates of the resulting reduction in permeability as a function of biofilm thickness. The associated reductions in porosity and specific surface can be estimated as well. Based on a sphere model of the medium, the Kozeny-Carman permeability model predicts physically realistic results for this problem. Using a cut-and-random-rejoin-type model of the medium, the permeability model of Childs and Collis-George yields qualitatively reasonable results for this problem, as does a generalization of the relative permeability model of Mualem. Permeability models of Kozeny-Carman and of Millington and Quirk lead to unrealistic results for a cut-and-random-rejoin-type medium. The Childs and Collis-George and the Mualem models predict that the permeability reduction for a given volume of biomass is greatest when the porous medium has uniform pore sizes.
229 citations
TL;DR: In this paper, the relative liquid permeability of mixtures of a liquid and a gas through sands and similar porous media at low Reynolds numbers obeys Darcy's law, and the degree of liquid saturation seems to be a more useful unit of liquid percentage than any other.
Abstract: Unsaturated steady flow of mixtures of a liquid and a gas through sands and similar porous media at low Reynolds numbers obeys Darcy's law. The relative liquid permeability K is not constant, but a universal function of the degree of liquid saturation. An approximate theory gives its form, which is a cubic parabola. A similar expression is found for the gas permeability. Numerous experiments by Wyckoff ami Botset confirm the theory. This is in agreement with Gardner's hypothesis that K is a function of the concentration in water, and indirectly with Richards' hypothesis that it is a function of the capillary potential. The degree of liquid saturation seems to be a more useful unit of liquid percentage than any other.
227 citations
TL;DR: In this paper, the correlation between fracture permeability and effective stress is established for gas shales through theoretical derivation, which is able to match the permeability data for different gas Shales.
227 citations
TL;DR: In this paper, a unified mathematical theory for the viscous dissipation term in the governing Brinkman equation is derived, which has the correct asymptotic behaviour in both the fully Darcy and Newtonian fluid flow limits.
Abstract: In this paper a unified mathematical theory for the viscous dissipation term in the governing Brinkman equation is derived. This term has, unlike other models, the correct asymptotic behaviour in both the fully Darcy and Newtonian fluid flow limits.
226 citations