Microtomography and Pore-Scale Modeling of Two-Phase Fluid Distribution |
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Authors: | Dmitriy Silin Liviu Tomutsa Sally M Benson Tad W Patzek |
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Institution: | (1) Department of Chemical Engineering, McGill University, Montreal, QC, Canada;(2) Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada |
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Abstract: | Synchrotron-based X-ray microtomography (micro CT) at the Advanced Light Source (ALS) line 8.3.2 at the Lawrence Berkeley
National Laboratory produces three-dimensional micron-scale-resolution digital images of the pore space of the reservoir rock
along with the spacial distribution of the fluids. Pore-scale visualization of carbon dioxide flooding experiments performed
at a reservoir pressure demonstrates that the injected gas fills some pores and pore clusters, and entirely bypasses the others.
Using 3D digital images of the pore space as input data, the method of maximal inscribed spheres (MIS) predicts two-phase
fluid distribution in capillary equilibrium. Verification against the tomography images shows a good agreement between the
computed fluid distribution in the pores and the experimental data. The model-predicted capillary pressure curves and tomography-based
porosimetry distributions compared favorably with the mercury injection data. Thus, micro CT in combination with modeling
based on the MIS is a viable approach to study the pore-scale mechanisms of CO2 injection into an aquifer, as well as more general multi-phase flows. |
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