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The Impact of Sub-Resolution Porosity on Numerical Simulations of Multiphase Flow
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In this article, the impact of sub-resolution porosity (SRP) on multiphase flow in porous rocks was investigated, and it was shown that SRP can function as a persistent connector preventing the formation of isolated wetting fluid domains during drainage, thus dramatically increasing relative permeabilities to both fluids at low saturations.Abstract:
Sub-resolution porosity (SRP) is an ubiquitous, yet often ignored, feature in Digital Rock Physics. It embodies the trade-off between image resolution and field-of-view, and it is a direct result of choosing an imaging resolution that is larger than the smallest pores in a heterogeneous rock sample. In this study, we investigate the impacts of SRP on multiphase flow in porous rocks. To do so, we use our newly developed Multiphase Micro-Continuum model to perform first-of-a-kind direct numerical simulations of two-phase flow in porous samples containing SRP. We show that SRP properties (porosity, permeability, wettability) can impact predicted absolute permeabilities, fluid breakthrough times, residual saturations, and relative permeabilities by factors of up to 2, 1.5, 3, and 20, respectively. In particular, our results reveal that SRP can function as a persistent connector preventing the formation of isolated wetting fluid domains during drainage, thus dramatically increasing relative permeabilities to both fluids at low saturations. Overall, our study confirms previous evidence that the influence of SRP cannot be disregarded without incurring significant errors in numerical predictions or experimental analyses of multiphase flow in heterogeneous porous media.read more
Citations
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Book ChapterDOI
Simulation of Two-Phase Flow in Models with Micro-porous Material
TL;DR: In this article , the authors presented an original numerical algorithm to simulate coupled two-phase fluid flow in domains containing open pores and microporous material using the time-dependent Navier-Stokes-Brinkman equation.
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Pore-Scale Evaluation of Physicochemical Interactions by Engineered Water Injections
TL;DR: In this paper , the authors evaluated the previously suggested mechanisms, namely wettability alteration and emulsification, against high-resolution micro-CT coreflood observations in a limestone sample, and integrated the effects of above-mentioned mechanisms into a volume-of-fluid simulation by using geochemical modelling and experimental measurements.
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Improved micro-continuum approach for capillary-dominated multiphase flow with reduced spurious velocity
TL;DR: In this paper , a hybrid interpolation scheme is proposed to improve the computational accuracy of the interface curvature and reduce the spurious velocity around the gas-liquid interface by 1-2 orders of magnitude.
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