Simulation Study of a Laboratory-Scale Experiment for Flow Behavior of Supercritical CO2 in Porous Media

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The quantitative estimation for the amount of storage and leakage of injected CO2 under the environment of underground is necessary for risk assessment of carbon dioxide capture and storage (CCS) . In addition, permeability characteristics of supercritical CO2 and water in porous media are very important parameter in order to predict migration of injected CO2 dependent on time and space. In this study, using sand column, we conducted experimental study on flow behavior of supercritical CO2 and water in porous media. Grain size and temperature were changed as an experimental parameter. Using experimental data for flow behavior such as discharge rate of fluids, differential pressure between inlet and outlet of sand column, we conducted a numerical simulation for this laboratory-scale experiment in order to clarify permeability characteristics of supercritical CO2 in porous media. As relative permeability model for simulation, the extended Corey model that Nkrg and Nkrw as indexes were introduced into the original one was used. By changing the values of Nkrg and Nkrw, history matching of flow behavior and pressure change during both of CO2 and water injection processes was carried out and the shapes of relative permeability curves that allowed us to reproduce CO2-water multi-phase flow behavior were optimized. Comparison of the optimized relative permeability curves in the process of CO2 injection indicated that 1) water mobility was relatively high compared with that of CO2 when grain size was large and 2) relative permeability to CO2 became higher under the condition below critical point of CO2. In addition, we interpreted transport phenomena of CO2 after shutoff of CO2 injection on the basis of relative permeability curves obtained for water injection process. As a result, it was found that 1) liquid CO2 easily migrated into geological formation in the cases of small grain size and low temperature and 2) dissolved CO2 migration due to groundwater flow contributed to the change of CO2 distribution under the condition of high water saturation.

Simulation Study of a Laboratory-Scale Experiment for Flow Behavior of Supercritical CO<SUB>2</SUB> in Porous Media

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