|Publisher||The International Society of Offshore and Polar Engineers||Language||English|
|Content Type||Conference Paper|
|Title||Multiphase Flow Behavior of Supercritical CO<sub>2</sub> In Sandy Sediments - Matching Analysis of Simulation And Experiment For Carbon Storage-|
|Authors||T. Komai, Y. Sakamoto, Research Institute for Geo-resources and Environment; A. Tanaka, National Institute of Advanced Industrial Science and Technology (AIST)|
|Source||The Twenty-second International Offshore and Polar Engineering Conference, June 17 - 22, 2012 , Rhodes, Greece|
|Copyright||2012. The International Society of Offshore and Polar Engineers|
|Keywords||Carbon dioxide; Geological storage; CCS; Supercritical, Multi-phase flow, Relative permeability.|
Multi-phase flow behavior consisting of supercritical CO2 and water in sandy sediments was experimentally examined to obtain relative permeability characteristics. In order to confirm the behavior, we have carried out a numerical simulation for laboratory-scale experiment, regarding permeability characteristics of supercritical CO2 in porous media. Experimental study and numerical analysis showed the characteristics of multiphase flow and the shapes of relative permeability curves have good agreement for these approaches. The results allow us to reproduce CO2-water flow multi-phase behavior in practical situation of geological structure. These data and parameters can be used for risk assessment of geological storage in various situations.
In this study, we conducted experimental study on multi-phase flow behavior consisting of supercritical CO2 and water in porous media. Grain size was changed as an experimental parameter in order to consider the effect on permeability characteristics. Using obtained experimental data, we conducted a numerical simulation for laboratoryscale experiment in order to clarify permeability characteristics of supercritical CO2 in porous media. Through numerical analysis, the shapes of relative permeability curves that allowed us to reproduce CO2-water flow multi-phase behavior were optimized. We also obtained a series behavior of supercritical CO2 and water multi-phase flow in porous media during both injection processes of CO2 and water through experimental work. As average sand grain diameter became larger, irreducible water saturation decreased gradually. Water saturation changed from 0.189 to 0.436 with grain diameter. Numerical simulation was carried out to clarify general behavior of multiphase flow of supercritical CO2 and water in porous media, considering the similar conditions of experiments. Through the simulation study, it was possible to quantitatively reproduce a series of behavior during CO2 injection by changing the shape of relative permeability curves. The comparison of relative permeability curves indicated that water mobility became adversely higher whereas gas mobility became relatively lower when average grain diameter was large.
|File Size||175 KB||5|