On Capillary Slowdown of Viscous Fingering in Immiscible Displacement in Porous Media

Daripa, Prabir; Paşa, Gelu

doi:10.1007/s11242-008-9211-2

Cited by 17 publications

(17 citation statements)

References 17 publications

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“…As discussed in Yortsos and Hickernell (1989), Daripa and Pasa (2008) and Babchin et al (2008), capillarity stabilizes only perturbations on short length scales. On larger length scales that are relevant for the field, the displacement could actually still be unstable.…”

Section: Introductionmentioning

confidence: 89%

“…While in a Hele-Shaw cell, at any given location, either one or the other liquid phase is present but phases do not co-exist, in the continuum description of multiphase flow in a porous medium the two phases co-exist at the same location in space (Yortsos and Hickernell, 1989;Daripa and Pasa, 2008) which is parameterized via the saturation of the wetting phase S w . As a consequence, in two-phase flow in porous media, capillarity manifests not only an effective interfacial tension between microscopic fluid-fluid interfaces, but p c / = 0 also causes a dispersion of the Buckley-Leverett shock front ("capillary dispersion", Jerauld et al, 1984) as sketched in Fig.…”

Section: Influence Of Capillarity On the Stabilitymentioning

confidence: 99%

“…Capillary pressure, however, is known to stabilize immiscible displacement (Hagoort, 1974;Parlange and Hill, 1976), in particular the shorter wavelengths, i.e. on a short length scale (Yortsos and Hickernell, 1989;Daripa and Pasa, 2008;Babchin et al, 2008). First the shock-front mobility ratio is used as a criterion to assess whether in the absence of capillarity an experimental condition would be stable or unstable.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stability of CO2–brine immiscible displacement

Berg

Ott

2012

International Journal of Greenhouse Gas Control

134

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a b s t r a c tThe viscous stability of the primary drainage process is of major interest for the injection of carbon dioxide (CO 2 ) in saline aquifers, since it determines the spread of the CO 2 plume in the target aquifer and consequently the initial utilization of the pore space for CO 2 storage. In order to analyze the stability of the displacement process, the relative permeability saturation functions must be known; these are usually derived by experiments under conditions representative for the field. It is therefore very important to characterize the flood front stability, not only on the field scale but also on the experimental scale, in order to judge the validity of the experimental results as a precondition for reliable field simulations.Here we investigate the onset of viscous fingering, thereby studying under what conditions CO 2 -brine displacement remains stable. We discuss the role of relative permeability and the stabilizing effect of capillary pressure at different length scales by means of numerical simulations. The results allow us to assess different definitions of the mobility ratio and establish criteria for judging the stability of the displacement process. We further show that in cases where gravitational forces are important, the gravity tongue dominates the fingering pattern, and unstable situations can occur where stability would be predicted, by considering viscous and capillary forces only.In the literature various criteria for the onset of instability have been proposed, but these are inconsistent or inconclusive. Our intention is to bring order into this discussion. In the present study we validate or refute stability criteria by numerical modeling and show that the shock-front mobility ratio correctly describes the onset of fingering. The application of our findings is not limited to CO 2 -brine displacement. The criteria for stability can be applied to most two-phase flow problems in reservoir engineering in general ranging from water flooding to low interfacial tension surfactant flooding.

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Section: Introductionmentioning

confidence: 89%

Section: Influence Of Capillarity On the Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability of CO2–brine immiscible displacement

Berg

Ott

2012

International Journal of Greenhouse Gas Control

134

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“…These two dimensionless numbers govern three dominant regions with distinct displacement patterns and efficiencies ( Figure 1): capillary fingering, viscous fingering, and stable displacement [54][55][56]. [52,53].…”

Section: Multiphase Fluids Flow In Porous Mediamentioning

confidence: 99%

Engineering Behavior and Characteristics of Water-Soluble Polymers: Implication on Soil Remediation and Enhanced Oil Recovery

Cao

Bate

et al. 2016

Sustainability

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Biopolymers have shown a great effect in enhanced oil recovery because of the improvement of water-flood performance by mobility control, as well as having been considered for oil contaminated-soil remediation thanks to their mobility control and water-flood performance. This study focused on the wettability analysis of biopolymers such as chitosan (85% deacetylated power), PEO (polyethylene oxide), Xanthan (xanthan gum), SA (Alginic Acid Sodium Salt), and PAA (polyacrylic acid), including the measurements of contact angles, interfacial tension, and viscosity. Furthermore, a micromodel study was conducted to explore pore-scale displacement phenomena during biopolymer injection into the pores. The contact angles of biopolymer solutions are higher on silica surfaces submerged in decane than at atmospheric conditions. While interfacial tensions of the biopolymer solutions have a relatively small range of 25 to 39 mN/m, the viscosities of biopolymer solutions have a wide range, 0.002 to 0.4 Pa¨s, that dramatically affect both the capillary number and viscosity number. Both contact angles and interfacial tension have effects on the capillary entry pressure that increases along with an applied effective stress by overburden pressure in sediments. Additionally, a high injection rate of biopolymer solutions into the pores illustrates a high level of displacement ratio. Thus, oil-contaminated soil remediation and enhanced oil recovery should be operated in cost-efficient ways considering the injection rates and capillary entry pressure.

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“…To reduce soil contamination, several soil remediation techniques that include excavation, soil vapour extraction, bioremediation, surfactant-enhanced remediation, and steam injection have been developed [26][27][28][29][30]. Soil excavation benefits from technical efficiency but is costly and limited for landfill sites [27].…”

Section: Biopolymer In Soil Remediation and Enhanced Oil Recoverymentioning

confidence: 99%

Characterization of Polyethylene Oxide and Sodium Alginate for Oil Contaminated-Sand Remediation

Jung

2017

Sustainability

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Abstract:Biopolymers have been employed in many soil applications, such as oil-contaminated soil remediation, due to their environmentally friendly characteristics. This study focused on changes in the wettability and viscosity of polyethylene oxide (PEO) and sodium alginate (SA), according to the variation in concentration and their impact on oil-contaminated soil remediation using biopolymer-decane displacement tests. The contact angle and interfacial tension vary with concentration by adding biopolymer to water; however both parameters yield relatively constant values within the range of 2-10 g/L for the concentration of PEO and SA. In this study, their influence on fluid invasion patterns is insignificant compared to viscosity and flow rate. Viscosity increases with the concentration of PEO and SA, within the range of 0-10 g/L, which causes the biopolymer-decane displacement ratio to increase with concentration. Biopolymer-decane displacement increases with injected fluid velocity. At low flow rates, the effect of the biopolymer concentration on the displacement ratio is prominent. However the effect decreases with an increase in flow rate. Thus both biopolymer concentration and injection velocity should be considered to achieve the economic efficiency of soil remediation. The experimental results for the distribution of soils with different grain sizes indicate that the displacement ratio increases with the uniformity of the coefficient of soils.

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On Capillary Slowdown of Viscous Fingering in Immiscible Displacement in Porous Media

Cited by 17 publications

References 17 publications

Stability of CO2–brine immiscible displacement

Stability of CO2–brine immiscible displacement

Engineering Behavior and Characteristics of Water-Soluble Polymers: Implication on Soil Remediation and Enhanced Oil Recovery

Characterization of Polyethylene Oxide and Sodium Alginate for Oil Contaminated-Sand Remediation

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