The Combined Effect of the Viscosity Ratio and the Wettability during Forced Imbibition through Nonplanar Porous Media

Τζίμας, Γεώργιος; Matsuura, T.; Avraam, D.G.; Brugghen, W. van der; Constantinides, George N.; Payatakes, A. C.

doi:10.1006/jcis.1996.4658

Cited by 32 publications

(31 citation statements)

References 14 publications

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“…[24,126] for percolation approaches). The main exception to this rule is the possibility of a "dynamic" transition between welldefined interfaces and fingering instabilities in spontaneous imbibition due to the slowing down of the interface [120,328]. A second possibility is the role of prewetting layers, whose presence may again render an interfacial description meaningless [201,202,203], since the essential dynamics are ruled by the prewetting.…”

Section: Pore Geometry and Inertiamentioning

confidence: 99%

“…This is particularly so at early times, due to the dissipation-induced changes [270]. The fast movement of menisci, coming from microscopic geometric considerations, coupled to the viscosity of the fluids involved, leads to dissipation at the front (viscous stresses) and should persist in all regimes and at all times in sponta- neous imbibition [328,329]. Some progress in accommodating dynamical phenomena can be made by modifying directly the contact angle in Washburn-like effective equations [117], see Fig. 14.…”

Section: Fig 13mentioning

confidence: 99%

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Imbibition in disordered media

Alava

Dubé

Rost

2004

Advances in Physics

289

340

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The physics of liquids in porous media gives rise to many interesting phenomena, including imbibition where a viscous fluid displaces a less viscous one. Here we discuss the theoretical and experimental progress made in recent years in this field. The emphasis is on an interfacial description, akin to the focus of a statistical physics approach. Coarse-grained equations of motion have been recently presented in the literature. These contain terms that take into account the pertinent features of imbibition: non-locality and the quenched noise that arises from the random environment, fluctuations of the fluid flow and capillary forces. The theoretical progress has highlighted the presence of intrinsic length-scales that invalidate scale invariance often assumed to be present in kinetic roughening processes such as that of a two-phase boundary in liquid penetration. Another important fact is that the macroscopic fluid flow, the kinetic roughening properties, and the effective noise in the problem are all coupled. Many possible deviations from simple scaling behaviour exist, and we outline the experimental evidence. Finally, prospects for further work, both theoretical and experimental, are discussed.

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Section: Pore Geometry and Inertiamentioning

confidence: 99%

Section: Fig 13mentioning

confidence: 99%

Imbibition in disordered media

Alava

Dubé

Rost

2004

Advances in Physics

289

340

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“…Increasing CA is also accompanied with less trapped oil, and a decrease in the residual oil saturation S or (Tzimas et al 1997;Constantinides and Payatakes 2000). Table 1 gives the S or for the different capillary numbers.…”

Section: Saturation Profilesmentioning

confidence: 94%

“…Experiments on micromodels by Lenormand et al (1983), Bernadiner (1998), Tzimas et al (1997), Kovscek et al (2007), Li and Wardlaw (1986) show that snap-off in imbibition is an important mechanism for disconnection and trapping of nonwetting fluid at low capillary numbers. The mechanism behind snap-off in imbibition is understood as due to fluctuations in the capillary pressure around a constriction.…”

Section: Snap-offmentioning

confidence: 97%

A Dynamic Network Model for Two-Phase Flow in Porous Media

Tørå

Øren²,

Hansen

2011

Transp Porous Med

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We present a dynamic model of immiscible two-phase flow in a network representation of a porous medium. The model is based on the governing equations describing two-phase flow in porous media, and can handle both drainage, imbibition, and steady-state displacement. Dynamic wetting layers in corners of the pore space are incorporated, with focus on modeling resistivity measurements on saturated rocks at different capillary numbers. The flow simulations are performed on a realistic network of a sandpack which is perfectly water-wet. Our numerical results show saturation profiles for imbibition in agreement with experiments. For free spontaneous imbibition we find that the imbibition rate follows the Washburn relation, i.e., the water saturation increases proportionally to the square root of time. We also reproduce rate effects in the resistivity index for drainage and imbibition.

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“…The latter are described as oil Ganglion Dynamics (GD) and Drop Traffic Flow (DTF), modes that have been systematically observed during flow within model pore networks (Avraam and Payatakes, 1995;Tzimas et al, 1997;Tallakstad et al, 2009;Krummel et al, 2013;Datta et al, 2014;Armstrong et al, 2016). Apart from laboratory studies, virtual studies, implementing dynamic pore network simulations Payatakes, 1996 andAlGharbi and Blunt, 2005;Nguyen et al, 2006), or lattice Boltzmann methods (Pan et al, 2004;Ghassemi and Pak, 2011;Ramstad et al, 2012;Armstrong et al, 2016), have also addressed disconnected-oil flow modes.…”

Section: Introductionmentioning

confidence: 99%

Oil Fragmentation, Interfacial Surface Transport and Flow Structure Maps for Two-Phase Flow in Model Pore Networks. Predictions Based on Extensive, DeProF Model Simulations

Valavanides

2018

Oil & Gas Science and Technology - Rev. IFP Energies nouvel

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-In general, macroscopic two-phase flows in porous media form mixtures of connectedand disconnected-oil flows. The latter are classified as oil ganglion dynamics and drop traffic flow, depending on the characteristic size of the constituent fluidic elements of the non-wetting phase, namely, ganglia and droplets. These flow modes have been systematically observed during flow within model pore networks as well as real porous media. Depending on the flow conditions and on the physicochemical, size and network configuration of the system (fluids and porous medium), these flow modes occupy different volume fractions of the pore network. Extensive simulations implementing the DeProF mechanistic model for steady-state, one-dimensional, immiscible twophase flow in typical 3D model pore networks have been carried out to derive maps describing the dependence of the flow structure on capillary number, Ca, and flow rate ratio, r. The model is based on the concept of decomposition into prototype flows. Implementation of the DeProF algorithm, predicts key bulk and interfacial physical quantities, fully describing the interstitial flow structure: ganglion size and ganglion velocity distributions, fractions of mobilized/stranded oil, specific surface area of oil/water interfaces, velocity and volume fractions of mobilized and stranded interfaces, oil fragmentation, etc. The simulations span 5 orders of magnitude in Ca and r. Systems with various viscosity ratios and intermediate wettability have been examined. Flow of the nonwetting phase in disconnected form is significant and in certain cases of flow conditions the dominant flow mode. Systematic flow structure mutations with changing flow conditions have been identified. Some of them surface-up on the macroscopic scale and can be measured e.g. the reduced pressure gradient. Other remain in latency within the interstitial flow structure e.g. the volume fractions of À or fractional flows of oil through À connected-disconnected flows. Deeper within the disconnected-oil flow, the mutations between ganglion dynamics and drop traffic flow prevail. Mutations shift and/or become pronounced with viscosity disparity. They are more evident over variables describing the interstitial transport properties of process than variables describing volume fractions. This characteristic behavior is attributed to the interstitial balance between capillarity and bulk viscosity. Mean mobilization probability of i-class ganglia S 2.3 IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvellesNumber density of i-class ganglia S (15)Number of pore unit cells occupied by each i-class ganglion P

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The Combined Effect of the Viscosity Ratio and the Wettability during Forced Imbibition through Nonplanar Porous Media

Cited by 32 publications

References 14 publications

Imbibition in disordered media

Imbibition in disordered media

A Dynamic Network Model for Two-Phase Flow in Porous Media

Oil Fragmentation, Interfacial Surface Transport and Flow Structure Maps for Two-Phase Flow in Model Pore Networks. Predictions Based on Extensive, DeProF Model Simulations

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