Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 46, Issue 20, Pages 11146-11154Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL083401
Keywords
CO2-geosequestration; oil reservoir; pore-scale flow; residual trapping; three-phase flow; x-ray microtomography
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Funding
- Australian Federal Government
- Royal Society [UF160443]
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CO2 geosequestration in oil reservoirs is an economically attractive solution as it can be combined with enhanced oil recovery (CO2-EOR). However, the effectiveness of the associated three-phase displacement processes has not been tested at the micrometer pore scale, which determines the overall reservoir-scale fluid dynamics and thus CO2-EOR project success. We thus imaged such displacement processes in situ in 3-D with X-ray microcomputed tomography at high resolution at reservoir conditions and found that oil extraction was enhanced substantially, while a significant residual CO2 saturation (13.5%) could be achieved in oil-wet rock. Statistics of the residual CO2 and oil clusters are also provided; they are similar to what is found in analogue two-phase systems although some details are different, and displacement processes are significantly more complex.
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