Oil/water displacement in microfluidic packed beds under weakly water-wetting conditions

competition between precursor film flow and piston-like displacement

Yukie Tanino (Corresponding Author), Xanat Zacarias Hernandez, Magali Christensen

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Abstract

Optical microscopy was used to measure depth-averaged oil distribution in a quasi-monolayer of crushed marble packed in a microfluidic channel as it was displaced by water. By calibrating the transmitted light intensity to oil thickness, we account for depth variation in the fluid distribution. Experiments reveal that oil saturation at water breakthrough decreases with increasing Darcy velocity, UwUw , between capillary numbers Ca=μwUw/σ=9×10−7Ca=μwUw/σ=9×10−7 and 9×10−69×10−6 , where μwμw is the dynamic viscosity of water and σσ is the oil/water interfacial tension, under the conditions considered presently. In contrast, end-point (long-time) remaining oil saturation depends only weakly on UwUw . This transient dependence on velocity is attributed to the competition between precursor film flow, which controls early time invasion dynamics but is inefficient at displacing oil, and piston-like displacement, which controls ultimate oil recovery. These results demonstrate that microfluidic experiments using translucent grains and fluids are a convenient tool for quantitative investigation of sub-resolution liquid/liquid displacement in porous media.
Original languageEnglish
Article number35
JournalExperiments in Fluids
Volume59
Early online date24 Jan 2018
DOIs
Publication statusPublished - Feb 2018

Fingerprint

Packed beds
pistons
Microfluidics
Pistons
wetting
Wetting
beds
Oils
oils
Water
water
saturation
oil recovery
Displacement control
fluids
Marble
calibrating
liquids
Fluids
Calcium Carbonate

Keywords

  • film flow
  • pore-scale imaging
  • multiphase flow
  • porous media
  • imbibition
  • fingering
  • roughness

Cite this

@article{86b78219ca56427db3535fc40a73ac4e,
title = "Oil/water displacement in microfluidic packed beds under weakly water-wetting conditions: competition between precursor film flow and piston-like displacement",
abstract = "Optical microscopy was used to measure depth-averaged oil distribution in a quasi-monolayer of crushed marble packed in a microfluidic channel as it was displaced by water. By calibrating the transmitted light intensity to oil thickness, we account for depth variation in the fluid distribution. Experiments reveal that oil saturation at water breakthrough decreases with increasing Darcy velocity, UwUw , between capillary numbers Ca=μwUw/σ=9×10−7Ca=μwUw/σ=9×10−7 and 9×10−69×10−6 , where μwμw is the dynamic viscosity of water and σσ is the oil/water interfacial tension, under the conditions considered presently. In contrast, end-point (long-time) remaining oil saturation depends only weakly on UwUw . This transient dependence on velocity is attributed to the competition between precursor film flow, which controls early time invasion dynamics but is inefficient at displacing oil, and piston-like displacement, which controls ultimate oil recovery. These results demonstrate that microfluidic experiments using translucent grains and fluids are a convenient tool for quantitative investigation of sub-resolution liquid/liquid displacement in porous media.",
keywords = "film flow, pore-scale imaging , multiphase flow , porous media, imbibition, fingering, roughness",
author = "Yukie Tanino and {Zacarias Hernandez}, Xanat and Magali Christensen",
note = "This paper contains work supported by the Royal Society Research Grant RG140009. XZH was supported by the Mexican National Council for Science and Technology, Mexico. The authors gratefully acknowledge Stephen A. Bowden for the absorption spectra (Fig. 3), Bernard Kombe for measuring the permeability of the packed beds and for his contribution to one of the microfluidic experiments, Munasuonyu Walter for the SEM image of crushed marble (Fig. 1) originally published in Bowden et al. 2016, Luca Romanello for providing unpublished viscosity and density measurements from his MSc thesis (Romanello, 2015), Aleksei Gunkin for his insights on post-processing, Paul Hallet for allowing MC access to their tensiometer, and Corex (UK) Ltd. for allowing Luca Romanello and MC access to their viscometer. We thank the three anonymous reviewers for their detailed comments. Open Access via Springer Compact Agreement.",
year = "2018",
month = "2",
doi = "10.1007/s00348-018-2490-7",
language = "English",
volume = "59",
journal = "Experiments in Fluids",
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TY - JOUR

T1 - Oil/water displacement in microfluidic packed beds under weakly water-wetting conditions

T2 - competition between precursor film flow and piston-like displacement

AU - Tanino, Yukie

AU - Zacarias Hernandez, Xanat

AU - Christensen, Magali

N1 - This paper contains work supported by the Royal Society Research Grant RG140009. XZH was supported by the Mexican National Council for Science and Technology, Mexico. The authors gratefully acknowledge Stephen A. Bowden for the absorption spectra (Fig. 3), Bernard Kombe for measuring the permeability of the packed beds and for his contribution to one of the microfluidic experiments, Munasuonyu Walter for the SEM image of crushed marble (Fig. 1) originally published in Bowden et al. 2016, Luca Romanello for providing unpublished viscosity and density measurements from his MSc thesis (Romanello, 2015), Aleksei Gunkin for his insights on post-processing, Paul Hallet for allowing MC access to their tensiometer, and Corex (UK) Ltd. for allowing Luca Romanello and MC access to their viscometer. We thank the three anonymous reviewers for their detailed comments. Open Access via Springer Compact Agreement.

PY - 2018/2

Y1 - 2018/2

N2 - Optical microscopy was used to measure depth-averaged oil distribution in a quasi-monolayer of crushed marble packed in a microfluidic channel as it was displaced by water. By calibrating the transmitted light intensity to oil thickness, we account for depth variation in the fluid distribution. Experiments reveal that oil saturation at water breakthrough decreases with increasing Darcy velocity, UwUw , between capillary numbers Ca=μwUw/σ=9×10−7Ca=μwUw/σ=9×10−7 and 9×10−69×10−6 , where μwμw is the dynamic viscosity of water and σσ is the oil/water interfacial tension, under the conditions considered presently. In contrast, end-point (long-time) remaining oil saturation depends only weakly on UwUw . This transient dependence on velocity is attributed to the competition between precursor film flow, which controls early time invasion dynamics but is inefficient at displacing oil, and piston-like displacement, which controls ultimate oil recovery. These results demonstrate that microfluidic experiments using translucent grains and fluids are a convenient tool for quantitative investigation of sub-resolution liquid/liquid displacement in porous media.

AB - Optical microscopy was used to measure depth-averaged oil distribution in a quasi-monolayer of crushed marble packed in a microfluidic channel as it was displaced by water. By calibrating the transmitted light intensity to oil thickness, we account for depth variation in the fluid distribution. Experiments reveal that oil saturation at water breakthrough decreases with increasing Darcy velocity, UwUw , between capillary numbers Ca=μwUw/σ=9×10−7Ca=μwUw/σ=9×10−7 and 9×10−69×10−6 , where μwμw is the dynamic viscosity of water and σσ is the oil/water interfacial tension, under the conditions considered presently. In contrast, end-point (long-time) remaining oil saturation depends only weakly on UwUw . This transient dependence on velocity is attributed to the competition between precursor film flow, which controls early time invasion dynamics but is inefficient at displacing oil, and piston-like displacement, which controls ultimate oil recovery. These results demonstrate that microfluidic experiments using translucent grains and fluids are a convenient tool for quantitative investigation of sub-resolution liquid/liquid displacement in porous media.

KW - film flow

KW - pore-scale imaging

KW - multiphase flow

KW - porous media

KW - imbibition

KW - fingering

KW - roughness

U2 - 10.1007/s00348-018-2490-7

DO - 10.1007/s00348-018-2490-7

M3 - Article

VL - 59

JO - Experiments in Fluids

JF - Experiments in Fluids

SN - 0723-4864

M1 - 35

ER -