Visual Analysis of Two‐Phase Flow Displacement Processes in Porous Media

Frey, Steffen; Scheller, Stefan; Karadimitriou, Nikolaos; Lee, Dongwon; Reina, Guido; Steeb, Holger; Ertl, Thomas

doi:10.1111/cgf.14432

Cited by 5 publications

(3 citation statements)

References 60 publications

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“…Various quantitative descriptions of multiphase flow through permeable media are of academic interest. Quantities related to dynamics, (e.g., capillary pressure, contact angle, curvature, velocity) and quantities regarding flow state (e.g., transient state duration, volume of displacement) are all subject to quantitative analysis that serves various purposes [8,11]. Instead of using the complete video, computation may be performed within a much smaller spatiotemporal window that encloses a phenomenon of interest, providing speed and accuracy boosts to algorithms such as those used in particle image velocimetry (PIV), e.g., [34].…”

Section: Quantitative Analysismentioning

confidence: 99%

“…This work is motivated by geological applications such as hydrocarbon recovery from subsurface formations [4,5] and geological storage of greenhouse gases [6,7]. Void spaces in subsurface formations often have complicated geometries and are formally described as a transport network consisting of spacious intersections (pores) of narrow bridges (throats) [8]. Accurate characterization of fluid dynamics at the same spatial scale as pores and throats is required to understand multiphase flow through complex networks.…”

Section: Introductionmentioning

confidence: 99%

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Examination of Haines Jump in Microfluidic Experiments via Evolution Graphs and Interface Tracking

Sun

Aryana

2022

Fluids

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This work examines a type of rapid pore-filling event in multiphase flow through permeable media that is better known as Haines Jump. While existing microfluidic experiments on Haines Jump mostly seek to maintain quasi-steady states through very low bulk flow rates over long periods of time, this work explores the combined use of a highly structured microscale transport network, high-speed fluorescent microscopy, displacement front segmentation algorithms, and a tracking algorithm to build evolution graphs that track displacement fronts as they evolve through high-speed video recording. The resulting evolution graph allows the segmentation of a high-speed recording in both space and time, potentially facilitating topology-cognitive computation on the transport network. Occurrences of Haines Jump are identified in the microfluidic displacement experiments and their significance in bulk flow rates is qualitatively analyzed. The bulk flow rate has little effect on the significance of Haines Jump during merging and splitting, but large bulk flow rates may obscure small bursts at the narrowest part of the throat.

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Section: Quantitative Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Examination of Haines Jump in Microfluidic Experiments via Evolution Graphs and Interface Tracking

Sun

Aryana

2022

Fluids

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“…This instability of invasion fronts is caused primarily by the meniscus capillary force at the fluid–fluid interface and the nonlocal viscous force . The capillary force causes slow displacement conditions dictated exclusively by the geometry of the pore structure, while the viscous force induced by friction slows down the boundary flow . This competition is considerably affected by pore geometry, ,, wettability, − gravity, , roughness, and disorder. − Regardless of these influencing factors, Lenormand et al proposed a classic immiscible displacement phase diagram on the M –Ca plane through numerical simulations and microfluidic experiments, attributing the invasion morphology to three domains: viscous fingering (VF), capillary fingering (CF), and stable displacement (SD).…”

Section: Introductionmentioning

confidence: 99%

Effects of Capillary and Viscous Forces on Two-Phase Fluid Displacement in the Microfluidic Model

Chen,

Liu,

Wang

et al. 2023

Energy Fuels

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Immiscible fluid−fluid displacement in porous media is an important phenomenon that impacts the field of underground energy and environmental engineering, such as enhanced oil/gas recovery, geological CO 2 sequestration, and transport and remediation of groundwater pollutants. In enhanced oil recovery, the occurrence of the fingering instability of the two-phase flow interface causes a significant reduction in the oil recovery factor for waterflooding. In geological CO 2 sequestration, the efficiency of CO 2 capillary/residual trapping is limited by the noncompact displacement pattern, presenting only part of brine displaced by scCO 2 . Although extensive studies have investigated viscous and capillary fingering in porous media, how viscous and capillary forces affect the crossover is not well understood. Quantifying and characterizing the transition of immiscible fluid−fluid displacement patterns are therefore important. In this article, comprehensive investigation of capillary number and viscosity ratio effects on displacement patterns and efficiency was established by a series of displacement microfluidic experiments in a homogeneous pore network. Three pairs of nonwetting−wetting immiscible fluids with viscosity ratios M ranging from 1/1000 to 1000 were used to perform the displacement experiments. The drainage experiments of water displacing silicone oil were conducted under five flow rate conditions with capillary number log 10 Ca ranging from −7.19 to −3.45, while the imbibition experiments of silicone oil displacing water displayed at four flow rates with log 10 Ca varying from −7.25 to −2.52. The relationship between displacement efficiency S inv and fractal dimension D f as a function of M and Ca was established to quantitatively determine the transition of displacement patterns (capillary fingering, viscous fingering, stable displacement, and ordered dendritic). The results indicated that D f increased with S inv under unfavorable conditions (M < 1) and decreased as S inv for M > 1, and lower invading fluid saturations were observed in the crossover zone between capillary fingering and viscous fingering for M = 1/20 and 1/200. Based on the pore-scale analysis of pore-filling events and microscopic observation, the theoretical model of the transitions for invasion modes were proposed to determine the critical capillary corresponding to viscosity ratio and contact angle. This study extends the classic log 10 M−log 10 Ca phase diagram and quantifies the dynamic effects of capillary force and viscous force on the immiscible fluid−fluid displacement process.

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Visualization and characterization of capillary-to-viscous transition in fluid-induced granular deformation

Ke,

Dai,

Kwok

et al. 2024

Physics of Fluids

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Comprehending pattern transitions during immiscible two-phase flow through granular materials is of paramount scientific and practical importance, as flow conditions are susceptible to variability along transport pathways in natural and engineering systems. The localized fluid displacement frequently mobilizes the hosting grains and triggers diverse morphological deformation. The interplay between such hydrodynamic and mechanical forces renders the deformation transitions inherently complex and hard to predict. Here, we integrate laboratory experiments with numerical simulations to probe the morphodynamics of fluid-driven granular deformation at the fundamental pore scale. Upon systematically varying capillary–viscous flows, we unveil three deformation patterns and propose a new dimensionless number incorporating the overlooked inertial and size effects to capture their transitions from slender channels to circular cavities to ramified fingers. We consistently observe lower residual saturation in the cavity regime attributed to the balanced capillary–viscous forces in this transition zone. Notably, our numerical model accurately mirrors the experimental observations and sheds light on the physics underlying the nucleation of characteristic crossover cavitation based on the microscale quantities of trivial energy leftover and uniform flow resistance.

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Visual Analysis of Two‐Phase Flow Displacement Processes in Porous Media

Cited by 5 publications

References 60 publications

Examination of Haines Jump in Microfluidic Experiments via Evolution Graphs and Interface Tracking

Examination of Haines Jump in Microfluidic Experiments via Evolution Graphs and Interface Tracking

Effects of Capillary and Viscous Forces on Two-Phase Fluid Displacement in the Microfluidic Model

Visualization and characterization of capillary-to-viscous transition in fluid-induced granular deformation

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