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Pore-scale observations of supercritical CO₂ drainage in Bentheimer sandstone by synchrotron x-ray imaging

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https://ir.library.oregonstate.edu/concern/articles/x920fz56n

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  • This work utilizes synchrotron-based x-ray computed microtomography (x-ray CMT) imaging to quantify the volume and topology of supercritical carbon dioxide (scCO₂) on a pore-scale basis throughout the primary drainage process of a 6 mm diameter Bentheimer sandstone core. Experiments were performed with brine and scCO₂ at 8.3 MPa (1200 psi) and 37.5°C. Capillary pressure–saturation curves for the scCO₂-brine system are presented and compared to the ambient air-brine system, and are shown to overlay one another when pressure is normalized by interfacial tension. Results are analyzed from images with a voxel resolution of 4.65 μm; image-based evidence demonstrates that scCO₂ invades the pore space in a capillary fingering regime at a mobility ratio M = 0.03 and capillary number Ca = 10[superscript −8.6] to an end-of-drainage brine saturation of 9%. We provide evidence of the applicability of previous two-dimensional micromodel studies and ambient condition experiments in predicting flow regimes occurring during scCO₂ injection.
  • Keywords: Carbon sequestration, Capillary fingering, Supercritical CO₂, Drainage, X-ray microtomography
  • Keywords: Carbon sequestration, Capillary fingering, Supercritical CO₂, Drainage, X-ray microtomography
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  • Herring, A. L., Andersson, L., Newell, D. L., Carey, J. W., & Wildenschild, D. (2014). Pore-scale observations of supercritical CO₂ drainage in Bentheimer sandstone by synchrotron x-ray imaging. International Journal of Greenhouse Gas Control, 25, 93-101. doi:10.1016/j.ijggc.2014.04.003
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  • 25
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  • We gratefully acknowledge the support of the U.S. Department of Energy through the LANL/LDRD Program (#20100025DR) for this work; as well as the Department of Energy’s Basic Energy Sciences, Geosciences Program via grant number DE-FG02-11ER16277. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. We acknowledge the support of GeoSoilEnviroCARS (Sector 13), which is supported by the National Science Foundation – Earth Sciences (EAR-1128799), and the Department of Energy, Geosciences (DE-FG02-94ER14466). L. Andersson wishes to acknowledge funding from the Swedish Science Council under grant number 2011-7025.
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