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Dynamic fluid connectivity during steady-state multiphase flow in a sandstone

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Title: Dynamic fluid connectivity during steady-state multiphase flow in a sandstone
Authors: Reynolds, CA
Menke, H
Andrew, M
Blunt, MJ
Krevor, S
Item Type: Journal Article
Abstract: The current conceptual picture of steady-state multiphase Darcy flow in porous media is that the fluid phases organize into separate flow pathways with stable interfaces. Here we demonstrate a previously unobserved type of steady-state flow behavior, which we term “dynamic connectivity,” using fast pore-scale X-ray imaging. We image the flow of N2 and brine through a permeable sandstone at subsurface reservoir conditions, and low capillary numbers, and at constant fluid saturation. At any instant, the network of pores filled with the nonwetting phase is not necessarily connected. Flow occurs along pathways that periodically reconnect, like cars controlled by traffic lights. This behavior is consistent with an energy balance, where some of the energy of the injected fluids is sporadically converted to create new interfaces.
Issue Date: 17-Jul-2017
Date of Acceptance: 21-Jun-2017
URI: http://hdl.handle.net/10044/1/53126
DOI: https://dx.doi.org/10.1073/pnas.1702834114
ISSN: 0027-8424
Publisher: National Academy of Sciences
Start Page: 8187
End Page: 8192
Journal / Book Title: Proceedings of the National Academy of Sciences of the United States of America
Volume: 114
Issue: 31
Copyright Statement: © 2017 National Academy of Sciences. All Rights Reserved.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Qatar Shell Research and Technology Center QSTP LLC
Qatar Petroleum
Funder's Grant Number: ERI 023708/EP/K000446/1
490000724
N/A
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
steady state
pore-scale imaging
immiscible two-phase flow
dynamic connectivity
geologic CO2 storage
POROUS-MEDIA
CARBON-DIOXIDE
2-PHASE FLOW
MICRO-CT
WATER
NITROGEN
IMAGE
METHANE
SYSTEMS
FORCES
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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