Pore-scale investigation on stress-dependent characteristics of granular packs and the impact of pore deformation on fluid distribution

V. A. Torrealba, Z. T. Karpyn, H. Yoon, K. A. Klise, D. Crandall

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Understanding the effect of changing stress conditions on multiphase flow in porous media is of fundamental importance for many subsurface activities including enhanced oil recovery, water drawdown from aquifers, soil confinement, and geologic carbon storage. Geomechanical properties of complex porous systems are dynamically linked to flow conditions, but their feedback relationship is often oversimplified due to the difficulty of representing pore-scale stress deformation and multiphase flow characteristics in high fidelity. In this work, we performed pore-scale experiments of single- and multiphase flow through bead packs at different confining pressure conditions to elucidate compaction-dependent characteristics of granular packs and their impact on fluid flow. A series of drainage and imbibition cycles were conducted on a water-wet, soda-lime glass bead pack under varying confining stress conditions. Simultaneously, X-ray micro-CT was used to visualize and quantify the degree of deformation and fluid distribution corresponding with each stress condition and injection cycle. Micro-CT images were segmented using a gradient-based method to identify fluids (e.g., oil and water), and solid phase redistribution throughout the different experimental stages. Changes in porosity, tortuosity, and specific surface area were quantified as a function of applied confining pressure. Results demonstrate varying degrees of sensitivity of these properties to confining pressure, which suggests that caution must be taken when considering scalability of these properties for practical modeling purposes. Changes in capillary number with confining pressure are attributed to the increase in pore velocity as a result of pore contraction. However, this increase in pore velocity was found to have a marginal impact on average phase trapping at different confining pressures.

Original languageEnglish (US)
Pages (from-to)198-207
Number of pages10
JournalGeofluids
Volume16
Issue number1
DOIs
StatePublished - Feb 1 2016

Fingerprint

confining pressure
multiphase flow
fluid
tortuosity
imbibition
enhanced oil recovery
drawdown
water
carbon sequestration
contraction
lime
fluid flow
trapping
porous medium
compaction
surface area
glass
porosity
distribution
aquifer

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

@article{9170ebd956f240cc9efde7a0c25e52bd,
title = "Pore-scale investigation on stress-dependent characteristics of granular packs and the impact of pore deformation on fluid distribution",
abstract = "Understanding the effect of changing stress conditions on multiphase flow in porous media is of fundamental importance for many subsurface activities including enhanced oil recovery, water drawdown from aquifers, soil confinement, and geologic carbon storage. Geomechanical properties of complex porous systems are dynamically linked to flow conditions, but their feedback relationship is often oversimplified due to the difficulty of representing pore-scale stress deformation and multiphase flow characteristics in high fidelity. In this work, we performed pore-scale experiments of single- and multiphase flow through bead packs at different confining pressure conditions to elucidate compaction-dependent characteristics of granular packs and their impact on fluid flow. A series of drainage and imbibition cycles were conducted on a water-wet, soda-lime glass bead pack under varying confining stress conditions. Simultaneously, X-ray micro-CT was used to visualize and quantify the degree of deformation and fluid distribution corresponding with each stress condition and injection cycle. Micro-CT images were segmented using a gradient-based method to identify fluids (e.g., oil and water), and solid phase redistribution throughout the different experimental stages. Changes in porosity, tortuosity, and specific surface area were quantified as a function of applied confining pressure. Results demonstrate varying degrees of sensitivity of these properties to confining pressure, which suggests that caution must be taken when considering scalability of these properties for practical modeling purposes. Changes in capillary number with confining pressure are attributed to the increase in pore velocity as a result of pore contraction. However, this increase in pore velocity was found to have a marginal impact on average phase trapping at different confining pressures.",
author = "Torrealba, {V. A.} and Karpyn, {Z. T.} and H. Yoon and Klise, {K. A.} and D. Crandall",
year = "2016",
month = "2",
day = "1",
doi = "10.1111/gfl.12143",
language = "English (US)",
volume = "16",
pages = "198--207",
journal = "Geofluids",
issn = "1468-8115",
publisher = "Wiley-Blackwell",
number = "1",

}

Pore-scale investigation on stress-dependent characteristics of granular packs and the impact of pore deformation on fluid distribution. / Torrealba, V. A.; Karpyn, Z. T.; Yoon, H.; Klise, K. A.; Crandall, D.

In: Geofluids, Vol. 16, No. 1, 01.02.2016, p. 198-207.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Pore-scale investigation on stress-dependent characteristics of granular packs and the impact of pore deformation on fluid distribution

AU - Torrealba, V. A.

AU - Karpyn, Z. T.

AU - Yoon, H.

AU - Klise, K. A.

AU - Crandall, D.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - Understanding the effect of changing stress conditions on multiphase flow in porous media is of fundamental importance for many subsurface activities including enhanced oil recovery, water drawdown from aquifers, soil confinement, and geologic carbon storage. Geomechanical properties of complex porous systems are dynamically linked to flow conditions, but their feedback relationship is often oversimplified due to the difficulty of representing pore-scale stress deformation and multiphase flow characteristics in high fidelity. In this work, we performed pore-scale experiments of single- and multiphase flow through bead packs at different confining pressure conditions to elucidate compaction-dependent characteristics of granular packs and their impact on fluid flow. A series of drainage and imbibition cycles were conducted on a water-wet, soda-lime glass bead pack under varying confining stress conditions. Simultaneously, X-ray micro-CT was used to visualize and quantify the degree of deformation and fluid distribution corresponding with each stress condition and injection cycle. Micro-CT images were segmented using a gradient-based method to identify fluids (e.g., oil and water), and solid phase redistribution throughout the different experimental stages. Changes in porosity, tortuosity, and specific surface area were quantified as a function of applied confining pressure. Results demonstrate varying degrees of sensitivity of these properties to confining pressure, which suggests that caution must be taken when considering scalability of these properties for practical modeling purposes. Changes in capillary number with confining pressure are attributed to the increase in pore velocity as a result of pore contraction. However, this increase in pore velocity was found to have a marginal impact on average phase trapping at different confining pressures.

AB - Understanding the effect of changing stress conditions on multiphase flow in porous media is of fundamental importance for many subsurface activities including enhanced oil recovery, water drawdown from aquifers, soil confinement, and geologic carbon storage. Geomechanical properties of complex porous systems are dynamically linked to flow conditions, but their feedback relationship is often oversimplified due to the difficulty of representing pore-scale stress deformation and multiphase flow characteristics in high fidelity. In this work, we performed pore-scale experiments of single- and multiphase flow through bead packs at different confining pressure conditions to elucidate compaction-dependent characteristics of granular packs and their impact on fluid flow. A series of drainage and imbibition cycles were conducted on a water-wet, soda-lime glass bead pack under varying confining stress conditions. Simultaneously, X-ray micro-CT was used to visualize and quantify the degree of deformation and fluid distribution corresponding with each stress condition and injection cycle. Micro-CT images were segmented using a gradient-based method to identify fluids (e.g., oil and water), and solid phase redistribution throughout the different experimental stages. Changes in porosity, tortuosity, and specific surface area were quantified as a function of applied confining pressure. Results demonstrate varying degrees of sensitivity of these properties to confining pressure, which suggests that caution must be taken when considering scalability of these properties for practical modeling purposes. Changes in capillary number with confining pressure are attributed to the increase in pore velocity as a result of pore contraction. However, this increase in pore velocity was found to have a marginal impact on average phase trapping at different confining pressures.

UR - http://www.scopus.com/inward/record.url?scp=84958595473&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84958595473&partnerID=8YFLogxK

U2 - 10.1111/gfl.12143

DO - 10.1111/gfl.12143

M3 - Article

AN - SCOPUS:84958595473

VL - 16

SP - 198

EP - 207

JO - Geofluids

JF - Geofluids

SN - 1468-8115

IS - 1

ER -