Automatic method for estimation of in situ effective contact angle from X-ray micro tomography images of two-phase flow in porous media

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Title: Automatic method for estimation of in situ effective contact angle from X-ray micro tomography images of two-phase flow in porous media
Authors: Scanziani, A
Singh, K
Blunt, MJ
Guadagnini, A
Item Type: Journal Article
Abstract: Multiphase flow in porous media is strongly influenced by the wettability of the system, which affects the arrangement of the interfaces of different phases residing in the pores. We present a method for estimating the effective contact angle, which quantifies the wettability and controls the local capillary pressure within the complex pore space of natural rock samples, based on the physical constraint of constant curvature of the interface between two fluids. This algorithm is able to extract a large number of measurements from a single rock core, resulting in a characteristic distribution of effective in situ contact angle for the system, that is modelled as a truncated Gaussian probability density distribution. The method is first validated on synthetic images, where the exact angle is known analytically; then the results obtained from measurements within the pore space of rock samples imaged at a resolution of a few microns are compared to direct manual assessment. Finally the method is applied to X-ray micro computed tomography (micro-CT) scans of two Ketton cores after waterflooding, that display water-wet and mixed-wet behaviour. The resulting distribution of in situ contact angles is characterized in terms of a mixture of truncated Gaussian densities.
Issue Date: 8-Feb-2017
Date of Acceptance: 6-Feb-2017
URI: http://hdl.handle.net/10044/1/48194
DOI: https://dx.doi.org/10.1016/j.jcis.2017.02.005
ISSN: 1095-7103
Publisher: Elsevier
Start Page: 51
End Page: 59
Journal / Book Title: Journal of Colloid and Interface Science
Volume: 496
Copyright Statement: © 2017 Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Sponsor/Funder: Abu Dhabi Company for Onshore Petroleum Operations (ADCO)
Funder's Grant Number: 16312.01
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Chemistry
Contact angle
Multiphase flow
Porous media
Wettability
Micro-CT imaging
CARBON GEO-SEQUESTRATION
MEMBRANE FUEL-CELLS
CAPILLARY-PRESSURE
INTERFACIAL-TENSION
CO2 SEQUESTRATION
RESERVOIR ROCKS
CT IMAGES
OIL-WET
WETTABILITY
WATER
Chemical Physics
03 Chemical Sciences
09 Engineering
02 Physical Sciences
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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