Journal
ADVANCES IN WATER RESOURCES
Volume 107, Issue -, Pages 460-469Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2017.05.011
Keywords
Capillary pressure; Curvature; Multiphase flow; Interfaces; X-ray tomography
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Funding
- Australian Research Council [DP160104995]
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We investigate capillary pressure-saturation (P-C-S) relationships for drainage-imbibition experiments conducted with air (nonwetting phase) and brine (wetting phase) in Bentheimer sandstone cores. Three different flow rate conditions, ranging over three orders of magnitude, are investigated. X-ray microcomputed tomographic imaging is used to characterize the distribution and amount of fluids and their interfacial characteristics. Capillary pressure is measured via (1) bulk-phase pressure transducer measurements, and (2) image-based curvature measurements, calculated using a novel 3D curvature algorithm. We distinguish between connected (percolating) and disconnected air clusters: curvatures measured on the connected phase interfaces are used to validate the curvature algorithm and provide an indication of the equilibrium condition of the data; curvature and volume distributions of disconnected clusters provide insight to the snap-offprocesses occurring during drainage and imbibition under different flow rate conditions. (C) 2017 Elsevier Ltd. All rights reserved.
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