Results 211 to 220 of about 124,745 (257)

A new formulation of apparent permeability for gas transport in shale

Journal of Natural Gas Science and Engineering, 2015
Abstract Recently, a few apparent permeability formulations have been proposed for gas transport in tight formations aiming of correcting flow deviation caused by slip flow and Knudsen diffusion. However, the effect of surface diffusion has always been neglected. Surface diffusion happens when gas molecules adsorb on the solid surface.
Detang Lu, Daolun Li
exaly   +2 more sources

Gas migration in the reservoirs of ultra-low porosity and permeability based on an improved apparent permeability model

Journal of Petroleum Science and Engineering, 2020
Abstract An apparent permeability model considering the solid-fluid coupling is established to analyze the gas transport in the reservoirs of ultra-low porosity and permeability. In the new model, multiple flow mechanisms including viscous flow, the dynamic effects induced by gas molecules collision with the pore walls and surface diffusion are taken
Xi-Qiao Feng, Zhihao Gong, Bin Gu
exaly   +2 more sources

Apparent gas permeability in an organic-rich shale reservoir

Fuel, 2016
Abstract Accurate models of gas transport in shale gas reservoirs must consider complex gas transport mechanisms and phase behavior in nanopores, as well as different pore types. The gas transport mechanisms in shale gas reservoirs include viscous flow, Knudsen diffusion, surface diffusion, adsorption and desorption. In this study, a unified model of
Jianlin Zhao, , Hai Sun
exaly   +2 more sources

A general approach to the apparent permeability index

Journal of Pharmacokinetics and Pharmacodynamics, 2008
The apparent permeability index is widely used as part of a general screening process to study drug absorption, and is routinely obtained from in vitro or ex vivo experiments. A classical example, widely used in the pharmaceutical industry, is the in vitro Caco-2 cell culture model.
Palumbo P, Picchini U, Beck B, van Gelder J, Delbar N, De Gaetano A   +5 more
openaire   +5 more sources

Nonempirical Apparent Permeability of Shale

SPE Reservoir Evaluation & Engineering, 2014
Summary Physics of fluid flow in shale reservoirs cannot be predicted from standard flow or mass-transfer models because of the presence of nanopores, ranging in size from one to hundreds of nanometers, in shales. Conventional continuum-flow equations, such as Darcy's law, greatly underestimate the fluid-flow rate when applied to ...
H. Singh, F. Javadpour, A. Ettehadtavakkol, H. Darabi   +3 more
openaire   +1 more source

Apparent Liquid Permeability in Shale

Unconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013, 2013
Copyright 2013, Unconventional Resources Technology Conference (URTeC) This paper was prepared for presentation at the Unconventional Resources Technology Conference held in Denver, Colorado, USA, 12-14 August 2013. The URTeC Technical Program Committee accepted this presentation on the basis of information contained in an abstract submitted by the ...
Francis Appiah, Farzam Javadpour, Rouzbeh Ghanbarnezhad Moghanloo   +2 more
openaire   +1 more source

True and Apparent Oxygen Permeabilities of Contact Lenses

Optometry and Vision Science, 1992
ABSTRACT We studied the passage of oxygen through some commercially available contact lenses. Oxygen diffusion coefficients were determined by the time‐lag method and a 201T Redher permeometer was used to measure the oxygen permeability and transmissibility by the polarographic method.
V, Compañ, J, Garrido, J A, Manzanares, J, Andrés, J S, Esteve, M L, López   +5 more
openaire   +2 more sources

Calculation of the permeability and apparent permeability of three-dimensional porous media

Transport in Porous Media, 2009
In this study, creeping and inertial incompressible fluid flows through three-dimensional porous media are considered, and an analytical–numerical approach is employed to calculate the associated permeability and apparent permeability. The multiscale homogenization method for periodic structures is applied to the Stokes and Navier–Stokes equations ...
Rodrigo P. A. Rocha, Manuel E. Cruz
openaire   +1 more source

Influence of Passive Permeability on Apparent P-glycoprotein Kinetics

Pharmaceutical Research, 2000
The objectives of this work were to evaluate the importance of moderate passive permeability on apparent P-glycoprotein (P-gp) kinetics, and demonstrate that inspection of basolateral to apical and apical to basolateral (BL-AP/AP-BL) permeability ratios may result in a compound being overlooked as a P-gp substrate and inhibitor of another drug's ...
K A, Lentz, J W, Polli, S A, Wring, J E, Humphreys, J E, Polli   +4 more
openaire   +2 more sources

A Novel Apparent Permeability Model in Shale Gas Reservoirs

Offshore Technology Conference Asia, 2022
Abstract A novel apparent permeability model of shale gas is derived considering the stress dependence, the thickness of adsorbed layer, slip flow, Knudsen diffusion and surface diffusion. The thickness of the adsorbed layer is derived according to the porosity occupied by the adsorbed phase in the capillary model.
Lang He, Bin Yang, Jing Liu, Xinyue Na, Yang Ge   +4 more
openaire   +1 more source