Capillary Trapping Of Supercritical CO2 InPorous Media At The Pore Scale
Capillary Trapping Of Supercritical CO2 InPorous Media At The Pore Scale
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DOI：
10.2495/mpf110261
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
T. Suekane;T. Izumi;Katsuhiro Okada
中科院分区：
文献类型：
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作者：
T. Suekane;T. Izumi;Katsuhiro Okada
在地质构造中捕获和储存二氧化碳被认为是一种将化石燃料使用和碳排放脱钩的有前途的方法。注入地质构造中的二氧化碳预计会被几种对抗浮力的机制捕获。在本文中，我们重点关注毛细管振打。对于储层条件下的超临界二氧化碳和水系统以及实验室条件下的氮气和水系统，通过微聚焦 X 射线 CT 在孔隙尺度上观察玻璃珠填充床中截留的气泡。当玻璃珠的直径相同时，每种条件下截留气泡的体积分布相似。在 8.5MPa 的压力和 45oC 的温度（对应于刚好高于临界点）下，超临界 CO2 和水之间的界面形态表明 CO2 对玻璃珠不润湿。残余气体饱和度随着玻璃珠直径的减小而增加，因为毛细管压力相对于浮力更高。残余气体饱和度可以表示为每个条件的反键数的函数。在玻璃珠直径相同的情况下，截留气泡体积的分布彼此相同。大的截留气泡有助于残余气体饱和度。
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.