Magnetic Resonance Studies of supercritical fluids in porous media

1335534 PI：Codd磁共振(MR)技术将用于研究纯超临界流体(C2F6和CO2)以及盐水和超临界CO2两相混合物在毛细管和多孔介质中的流动和扩散特性。这项研究将从相对简单的毛细管内流动转向更复杂的流动，包括指进不稳定性和多孔介质中盐水-超临界二氧化碳混合物的浮力驱动流动。结果将被用来确定这些系统中临界点附近的行为，并建立理论的有效性。目前正在提议将超临界状态下的二氧化碳储存在地球构造(多孔介质)中，作为减少大气中二氧化碳的手段。碳封存要求二氧化碳在超临界状态下与地下卤水接触储存。超临界流体也被用作工业过程中的绿色溶剂，如脱咖啡因和提高石油采收率。本研究的结果将有助于评估风险，设计更安全的碳封存和使用超临界流体的工业流程。

1335534 PI: CoddMagnetic Resonance (MR) techniques will be used to study flows and diffusion characteristics of both pure supercritical fluids (C2F6 and CO2) and a two-phase mixture of brine and supercritical CO2 in capillaries and in porous media. The study will proceed from relatively simple flows in capillaries to more complex ones, involving fingering instability and buoyancy-driven flows of brine-supercritical CO2 mixtures in porous media. Results will be used to determine behavior near critical points in these systems and to establish the validity of a theory. Storage of CO2 in a supercritical state in earth formations (porous media) is currently being proposed as means to reduce CO2 in the atmosphere. Carbon sequestration requires the storage of CO2 in its supercritical state in contact with subsurface brines. Supercritical fluids are also used as green solvents in industrial processes such as decaffeination and enhanced oil recovery. The results of the present study will be useful in assessing the risks and in designing safer carbon sequestration and industrial processes that use supercritical fluids.