Imaging of oil layers, curvature and contact angle in a mixed-wet and a water-wet carbonate rock
TLDR
In this paper, the authors investigated the effect of wettability of carbonate rocks on the morphologies of remaining oil after sequential oil and brine injection in a capillary-dominated flow regime at elevated pressure.Abstract:
We have investigated the effect of wettability of carbonate rocks on the morphologies of remaining oil after sequential oil and brine injection in a capillary-dominated flow regime at elevated pressure. The wettability of Ketton limestone was altered in situ using an oil phase doped with fatty acid which produced mixed-wet conditions (the contact angle where oil contacted the solid surface, measured directly from the images, θ=180°, while brine-filled regions remained water-wet), whereas the untreated rock (without doped oil) was weakly water-wet (θ=47 ± 9°). Using X-ray micro-tomography, we show that the brine displaces oil in larger pores during brine injection in the mixed-wet system, leaving oil layers in the pore corners or sandwiched between two brine interfaces. These oil layers, with an average thickness of 47 ± 17 µm, may provide a conductive flow path for slow oil drainage. In contrast, the oil fragments into isolated oil clusters/ganglia during brine injection under water-wet conditions. Although the remaining oil saturation in a water-wet system is about a factor of two larger than that obtained in the mixed-wet rock, the measured brine-oil interfacial area of the disconnected ganglia is a factor of three smaller than that of oil layers.read more
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Carbon capture and storage (CCS): the way forward
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Multiphase Flow in Permeable Media: A Pore-Scale Perspective
TL;DR: Multiphase Flow In Permeable Media Co Uk Martin J. Blunt and Je Santos Multiphaseporousmediapalabos Library.
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Multi-scale multi-dimensional microstructure imaging of oil shale pyrolysis using X-ray micro-tomography, automated ultra-high resolution SEM, MAPS Mineralogy and FIB-SEM
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Automatic measurement of contact angle in pore-space images
TL;DR: Singh et al. as discussed by the authors presented an approach to measure the in-situ contact angle between immiscible fluids, applied to segmented pore-scale X-ray images.
References
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