H114 多孔質内において毛管力でトラップされた超臨界CO_2気泡のポアスケール可視化(OS11 温暖化対策とCO_2削減技術)

概要

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Carbon dioxide capture and storage in geological formations (CCS) is recognized as a promising method for decoupling fossil fuel use carbon emissions. We focused on capillary trapping, because capillary trapping is considered a high long-term stability. Trapped bubbles in packed beds of glass beads have been visualized by means of X-ray CT at pore scale for supercritical CO_2 at reservoir condition (pressure: 8.5MPa, temperature: 45℃) and for nitrogen at laboratory room condition. When the diameter of glass beads is same, distribution of volume of trapped bubbles is similar for each condition. The morphology of the interface between the supercritical CO_2 and water suggests that CO_2 is non-wetting to glass beads. Residual gas saturation increases with a decrease in the diameter of glass beads. Residual gas saturation can be expressed as a function of the reverse Bond number for each condition. With decrease in glass beads diameter, residual gas saturation increases, and trapped bubble volume is shifts to be large compared with glass beads volume.
2011-06-22