Effects of pressure and wettability on residual phase saturation in sandstone rock

Lackner, Alf Sebastian; Torsæter, Ole

doi:10.1016/j.petrol.2006.03.013

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…[] similarly found that residual oil saturation decreased from 30% when the core was strongly water wet or oil wet to about 20% when the system was neutrally wet (contact angle α ≈ 90°) in reservoir rock, although their experimental data had considerable scatter. In another study, Lackner and Tordaeter [] found higher residual gas saturation for intermediate‐wet cores than water‐wet ones. In Martys ' simulations, the pore space characteristics, e.g., the structure and size distribution in simulations 4 and 6, as well as in simulations 5 and 7, were identical.…”

Section: Resultsmentioning

confidence: 99%

Gas and solute diffusion in partially saturated porous media: Percolation theory and Effective Medium Approximation compared with lattice Boltzmann simulations

et al. 2015

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Understanding and accurate prediction of gas or liquid phase (solute) diffusion are essential to accurate prediction of contaminant transport in partially saturated porous media. In this study, we propose analytical equations, using concepts from percolation theory and the Effective Medium Approximation (EMA) to model the saturation dependence of both gas and solute diffusion in porous media. The predictions of our theoretical approach agree well with the results of nine lattice Boltzmann simulations. We find that the universal quadratic scaling predicted by percolation theory, combined with the universal linear scaling predicted by the EMA, describes diffusion in porous media with both relatively broad and extremely narrow pore size distributions.

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Section: Resultsmentioning

confidence: 99%

Gas and solute diffusion in partially saturated porous media: Percolation theory and Effective Medium Approximation compared with lattice Boltzmann simulations

et al. 2015

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show abstract

“…[] reported that the residual oil saturation decreased from 30%, when the core was strongly water wet or oil wet, to about 20% when the system was neutrally wet (contact angle α ≈ 90°) in reservoir rock, although their experimental data had considerable scatter. Lackner and Tordaeter [] reported higher residual gas saturation for intermediate‐wet cores than water wet ones. By analyzing the results computed by lattice‐Boltzmann simulations, Ghanbarian et al .…”

Section: Resultsmentioning

confidence: 99%

Modeling relative permeability of water in soil: Application of effective‐medium approximation and percolation theory

Ghanbarian

Sahimi

Daigle

2016

Water Resources Research

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Accurate prediction of the relative permeability to water under partially saturated condition has broad applications and has been studied intensively since the 1940s by petroleum, chemical, and civil engineers, as well as hydrologists and soil scientists. Many models have been developed for this purpose, ranging from those that represent the pore space as a bundle of capillary tubes, to those that utilize complex networks of interconnected pore bodies and pore throats with various cross‐section shapes. In this paper, we propose an approach based on the effective‐medium approximation (EMA) and percolation theory in order to predict the water relative permeability. The approach is general and applicable to any type of porous media. We use the method to compute the water relative permeability in porous media whose pore‐size distribution follows a power law. The EMA is invoked to predict the relative permeability from the fully saturated pore space to some intermediate water saturation that represents a crossover from the EMA to what we refer to as the “critical region.” In the critical region below the crossover water saturation Swx, but still above the critical water saturation Swc (the residual saturation or the percolation threshold of the water phase), the universal power law predicted by percolation theory is used to compute the relative permeability. To evaluate the accuracy of the approach, data for 21 sets of undisturbed laboratory samples were selected from the UNSODA database. For 14 cases, the predicted relative permeabilities are in good agreement with the data. For the remaining seven samples, however, the theory underestimates the relative permeabilities. Some plausible sources of the discrepancy are discussed.

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“…There is a broad variety of relevant application areas such as the enhanced oil recovery (Lackner and Torsaeter, 2006), the CO 2 storage in deep saline aquifers and depleted oil reservoirs (Berg and Ott, 2012), the soil contamination and reconstitution (Gao et al, 2013), the performance of proton exchange membranes in fuel cells (Wang et al, 2010). Sophisticated experimental setups have been developed to measure the steady-state relative permeability curves of porous media (Bentsen and Manai, 1991;Ayub and Bentsen, 2001), and analyze the interfacial viscous coupling effects (Ayub and Bentsen, 2004).…”

Section: Introductionmentioning

confidence: 99%

Steady-state two-phase relative permeability functions of porous media: A revisit

Tsakiroglou

Aggelopoulos

Terzi

et al. 2015

International Journal of Multiphase Flow

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Effects of pressure and wettability on residual phase saturation in sandstone rock

Cited by 8 publications

References 3 publications

Gas and solute diffusion in partially saturated porous media: Percolation theory and Effective Medium Approximation compared with lattice Boltzmann simulations

Gas and solute diffusion in partially saturated porous media: Percolation theory and Effective Medium Approximation compared with lattice Boltzmann simulations

Modeling relative permeability of water in soil: Application of effective‐medium approximation and percolation theory

Steady-state two-phase relative permeability functions of porous media: A revisit

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