2020
DOI: 10.1002/vzj2.20056
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Forward prediction of early‐time spontaneous imbibition of water in unsaturated rock fractures

Abstract: Spontaneous imbibition is a capillary-driven phenomenon in which a wetting fluid displaces a nonwetting fluid from voids without any increase in external pressure. This study compared forward predictions of early-time displacement of air by water within Mode I fractures in 14 low-porosity rock cores using a new fractal model with those based on an established parallel plate model. Spontaneous imbibition was measured using dynamic neutron radiography, along with independent determinations of equilibrium contact… Show more

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Cited by 6 publications
(2 citation statements)
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“…One benefit of the simplicity of the approach is that an apparatus could be built to accommodate larger samples relatively easily (i.e., only change in water mass is measured, rather than the sample total mass). It can be difficult to test representative fractures in small laboratory samples (Perfect et al., 2020), the ability of the method to test larger samples may allow testing on more representative fracture networks (although imbibition may only occur into small‐aperture fractures).…”
Section: Discussionmentioning
confidence: 99%
“…One benefit of the simplicity of the approach is that an apparatus could be built to accommodate larger samples relatively easily (i.e., only change in water mass is measured, rather than the sample total mass). It can be difficult to test representative fractures in small laboratory samples (Perfect et al., 2020), the ability of the method to test larger samples may allow testing on more representative fracture networks (although imbibition may only occur into small‐aperture fractures).…”
Section: Discussionmentioning
confidence: 99%
“…In Chen et al (1999), Hopmans' team combined parameter estimation with capillary pressure-saturation-permeability relationships. In this section, one of the existing fracture wetting process models (i.e., the parallel plate model) is compared by Perfect et al (2020) with their new fractal model, which accounts for fracture surface roughness. They validate their model calculations with experimental data obtained with dynamic neutron radiography, fracture surface fractal dimension, and equilibrium contact angle for 14 different rock types and samples.…”
Section: Core Ideasmentioning
confidence: 99%