Comparison of gas, Klinkenberg, and liquid permeability of sandstone: Flow regime and pore size

Liquid permeability of sedimentary rocks is relevant in several contexts, but gas easier to measure, so liquid typically estimated from via empirical or semiempirical correction procedures. A frequently used and trusted procedure the well-known Klinkenberg correction, which based on pressure dependence permeability. However, gaseous flow-through experiments a series Fontainebleau, Castlegate, Bentheim, Obernkirchen sandstones, this study indicates that equivalent derived only compares with permeability, when flow adheres Darcy’s law. The lower upper limits Darcy are defined by Knudsen Reynolds numbers, respectively. Both numbers can be porosity pore-throat distribution, these properties, it possible assess for applicability correction. For studied non-Darcy indicated largest pores diameters above approximately 10 μm, causing an erroneous diffusion takes place smaller than 0.1 contribution overall small is, however, insignificant sandstones. modeled contributions each pore size using Kozeny’s equation surface relaxation times nuclear magnetic resonance data shows have no positive effect because existence throats; instead, they may negative turbulence.