Regular ArticleDiffusion of Water at Low Saturation Levels into Sandstone Rock Plugs Measured by Broad Line Magnetic Resonance Profiling
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2012, Progress in Nuclear Magnetic Resonance SpectroscopyCitation Excerpt :Many porous materials can adsorb various vapors and gases. Adsorption of water vapor by the sandstone rock cores of various compositions, porosities and permeabilities at saturation levels below the vapor percolation threshold has been studied using GE with an oscillating gradient [228,258]. The results were modeled based on parallel transport of water in the vapor phase and water adsorbed on the pore walls, with a dynamic local equilibrium between the two phases.
NMR spectroscopy in environmental research: From molecular interactions to global processes
2011, Progress in Nuclear Magnetic Resonance SpectroscopyCitation Excerpt :Williams and coworkers used MRI to investigate fluid viscosity and rock core plug permeability in Lochaline sandstone [601]. In 1996, McDonald and coworkers used broad line magnetic resonance imaging to profile water ingress into a series of sandstone rock plugs at saturation levels below the vapor percolation threshold [602]. The ability to visualize water and oil in rock plugs is of substantial importance in the modeling of diffusion processes within rock and the subsequent development of enhanced oil recovery techniques from reservoir fields.
A quantitative NMR imaging study of mass transport in porous solids during drying
2000, Chemical Engineering ScienceCitation Excerpt :A monograph of Crank (1956) is a very popular reference which provides solutions as well as useful recipes. However, in many cases, including the drying processes in natural and synthetic porous solids, the effective diffusivity is likely to be dependent on the concentration of the diffusing substance (Pel, Ketelaars, Adan & van Well, 1993; Ketelaars, Pel, Coumans & Kerkhof, 1995; McDonald, Pritchard & Roberts, 1996; Pel, Brocken & Kopinga, 1996). Numerical solution of the diffusion equation can be employed in such cases, which makes this straightforward approach time consuming.
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1999, Experimental Methods in the Physical Sciences