Trapping and hysteresis in two‐phase flow in porous media: A pore‐network study

Niasar, Vahid; Doster, Florian; Armstrong, Ryan T.; Wildenschild, D.; Celia, Michael A.

doi:10.1002/wrcr.20313

Cited by 82 publications

(37 citation statements)

References 31 publications

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“…Similarly, air compression and consequences on flow were simplified. Twophase flow mechanisms may be more complex with disconnected water or air phases (Joekar-Niasar et al, 2013;Marinas et al, 2009). A more detailed description of air dissolution into water along with a proper description of twophase flow accounting for the air and water connectivity may be required.…”

Section: Resultsmentioning

confidence: 99%

Water infiltration in an aquifer recharge basin affected by temperature and air entrapment

Loizeau

Rossier

Gaudet

et al. 2017

Journal of Hydrology and Hydromechanics

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Artificial basins are used to recharge groundwater and protect water pumping fields. In these basins, infiltration rates are monitored to detect any decrease in water infiltration in relation with clogging. However, miss-estimations of infiltration rate may result from neglecting the effects of water temperature change and air-entrapment. This study aims to investigate the effect of temperature and air entrapment on water infiltration at the basin scale by conducting successive infiltration cycles in an experimental basin of 11869 m 2 in a pumping field at Crepieux-Charmy (Lyon, France). A first experiment, conducted in summer 2011, showed a strong increase in infiltration rate; which was linked to a potential increase in ground water temperature or a potential dissolution of air entrapped at the beginning of the infiltration. A second experiment was conducted in summer, to inject cold water instead of warm water, and also revealed an increase in infiltration rate. This increase was linked to air dissolution in the soil. A final experiment was conducted in spring with no temperature contrast and no entrapped air (soil initially water-saturated), revealing a constant infiltration rate. Modeling and analysis of experiments revealed that air entrapment and cold water temperature in the soil could substantially reduce infiltration rate over the first infiltration cycles, with respective effects of similar magnitude. Clearly, both water temperature change and air entrapment must be considered for an accurate assessment of the infiltration rate in basins.

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Section: Resultsmentioning

confidence: 99%

Water infiltration in an aquifer recharge basin affected by temperature and air entrapment

Loizeau

Rossier

Gaudet

et al. 2017

Journal of Hydrology and Hydromechanics

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“…The relationship between the initial and residual non-wetting saturations is known as the IR (for initialresidual) curve and and a number of empirical models have been developed around this concept. Reviews included in Pentland et al (2010) and Joekar-Niasar et al (2013) discuss the models developed by Land (1968), Lenhard and Parker (1987), Ma and Youngren (1994), Jerauld (1997), Kleppe et al (1997) and Spiteri et al (2008). In short these models take different functional forms and have either one or two degrees of freedom with which to match observed data.…”

Section: The Initial-residual Characteristic Curvementioning

confidence: 99%

Capillary trapping for geologic carbon dioxide storage – From pore scale physics to field scale implications

Krevor

Blunt

Benson

et al. 2015

International Journal of Greenhouse Gas Control

406

250

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a b s t r a c tA significant amount of theoretical, numerical and observational work has been published focused on various aspects of capillary trapping in CO 2 storage since the IPCC Special Report on Carbon Dioxide Capture and Storage (2005). This research has placed capillary trapping in a central role in nearly every aspect of the geologic storage of CO 2 . Capillary, or residual, trapping -where CO 2 is rendered immobile in the pore space as disconnected ganglia, surrounded by brine in a storage aquifer -is controlled by fluid and interfacial physics at the size scale of rock pores. These processes have been observed at the pore scale in situ using X-ray microtomography at reservoir conditions. A large database of conventional centimetre core scale observations for flow modelling are now available for a range of rock types and reservoir conditions. These along with the pore scale observations confirm that trapped saturations will be at least 10% and more typically 30% of the pore volume of the rock, stable against subsequent displacement by brine and characteristic of water-wet systems. Capillary trapping is pervasive over the extent of a migrating CO 2 plume and both theoretical and numerical investigations have demonstrated the first order impacts of capillary trapping on plume migration, immobilisation and CO 2 storage security. Engineering strategies to maximise capillary trapping have been proposed that make use of injection schemes that maximise sweep or enhance imbibition. National assessments of CO 2 storage capacity now incorporate modelling of residual trapping where it can account for up to 95% of the storage resource. Field scale observations of capillary trapping have confirmed the formation and stability of residually trapped CO 2 at masses up to 10,000 tons and over time scales of years. Significant outstanding uncertainties include the impact of heterogeneity on capillary immobilisation and capillary trapping in mixed-wet systems. Overall capillary trapping is well constrained by laboratory and field scale observations, effectively modelled in theoretical and numerical models and significantly enhances storage integrity, both increasing storage capacity and limiting the rate and extent of plume migration.

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“…The practical relevance of these phase ordering processes lies in the fact that they may control the initial distribution of fluids within the pore space as well as phase 084302-13 connectivity. Phase connectivity is directly linked to phase mobility [97], while fluid-fluid interfacial areas control mass and heat transfer and equilibrium capillary pressures [98].…”

Section: Spinodal Decomposition Of a Van Der Waals Fluid In A Poromentioning

confidence: 99%

Pore-scale modeling of phase change in porous media

Cueto‐Felgueroso

Juanes

2018

Phys. Rev. Fluids

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The combination of high-resolution visualization techniques and pore-scale flow modeling is a powerful tool used to understand multiphase flow mechanisms in porous media and their impact on reservoir-scale processes. One of the main open challenges in pore-scale modeling is the direct simulation of flows involving multicomponent mixtures with complex phase behavior. Reservoir fluid mixtures are often described through cubic equations of state, which makes diffuse-interface, or phase-field, theories particularly appealing as a modeling framework. What is still unclear is whether equation-of-state-driven diffuse-interface models can adequately describe processes where surface tension and wetting phenomena play important roles. Here we present a diffuse-interface model of single-component two-phase flow (a van der Waals fluid) in a porous medium under different wetting conditions. We propose a simplified Darcy-Korteweg model that is appropriate to describe flow in a Hele-Shaw cell or a micromodel, with a gap-averaged velocity. We study the ability of the diffuse-interface model to capture capillary pressure and the dynamics of vaporization-condensation fronts and show that the model reproduces pressure fluctuations that emerge from abrupt interface displacements (Haines jumps) and from the breakup of wetting films.

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Trapping and hysteresis in two‐phase flow in porous media: A pore‐network study

Cited by 82 publications

References 31 publications

Water infiltration in an aquifer recharge basin affected by temperature and air entrapment

Water infiltration in an aquifer recharge basin affected by temperature and air entrapment

Capillary trapping for geologic carbon dioxide storage – From pore scale physics to field scale implications

Pore-scale modeling of phase change in porous media

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