Capillary Trapping Of Supercritical CO2 In
Porous Media At The Pore Scale
Author(s)
T. Suekane, T. Izumi & K. Okada
Abstract
Carbon dioxide capture and storage in geological formations is recognized as a
promising method for decoupling fossil fuel use and carbon emissions. Carbon
dioxide injected into geological formations is expected to be trapped by several
mechanisms against buoyancy. In this paper, we focused on capillary rapping.
Trapped bubbles in packed beds of glass beads were visualized by means of
micro-focused X-ray CT at pore scale for supercritical CO2 and water systems at
reservoir condition and for nitrogen and water systems at laboratory room
condition. When the diameter of glass beads is the same, distribution of volume
of trapped bubbles is similar for each condition. At the pressure of 8.5MPa and
the temperature of 45ºC, which corresponds to just above a critical point, the
morphology of the interface between the supercritical CO2 and water suggests
that CO2 is non-wetting to glass beads. Residual gas saturation increases with a
decrease in a diameter of glass beads, because the capillary pressure is higher
with respect to buoyancy. Residual gas saturation can be expressed as a function
of the reverse Bond number for each condition. Distribution of trapped bubble
volume is identical with each other for each condition at same diameter of glass
beads. The large trapped bubbles contribute to the residual gas saturation.
Keywords: capillary trapping, residual gas saturation, supercritical CO2,
micro-focused X-ray CT, carbon dioxide capture and storage.
Keywords
capillary trapping, residual gas saturation, supercritical CO2,
micro-focused X-ray CT, carbon dioxide capture and storage
Related Book
Other papers in this volume
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