Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

H (Human Geosciences) » H-SC Social Earth Sciences & Civil/Urban System Sciences

[H-SC05] CCUS (Carbon Dioxide Capture, Utilization, and Storage) for Climate Mitigation

Wed. May 23, 2018 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Masao Sorai(Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology), Ziqiu Xue(Research Institute of Innovative Tech for the Earth), Masaatsu Aichi(東京大学大学院新領域創成科学研究科)

[HSC05-P09] The research on the movement of CO2 solution in CO2 microbubble storage.

*Shinya Morikawa1 (1.University of Tokyo)

Keywords:Carbon dioxide Capture and Storage, Carbon dioxide Microbubble Storage, Fingering

It is important to keep CO2 underground from leaking out of the ground for Carbon dioxide Capture and Storage (CCS). Carbon dioxide Microbubble Storage, that injects CO2 microbubble water instead of supercritical CO2, is one of the ways of CCS and it does not require the existence of cap rock, because the higher density of CO2 dissolved water enables CO2 to go downward. Existing studies on CMS revealed an efficiency of CO2 microbubble to make the CO2 dissolved water CO2 transport in the underground by numerical analysis. However, there are few researches to examine the movement of CO2 solution by laboratory experiments, and then, we conducted experiments to know how CO2 dissolved water moves after injection into a water tank filled with grass beads and BTB solution.
Experimental procedures are as follows. Water tank (height: 30 cm, width: 50cm, thickness: 3cm) made of acrylic boards was used for experiments. The tank was filled with grass beads (1mm in diameter) and BTB solution. Permeability was measured by controlling the difference of hydraulic head between the left and right end of the tank and found to be 1.32*10^-2 m/s. We observed how CO2 dissolved water moves after CO2 microbubble water was injected. As a result, CO2 solution moved downward as time passed and the shape of CO2 solution showed fingering.
In the second experiment, we injected CO2 solution by controlling the horizontal groundwater flow rate. As a result, it was observed that CO2 moved downward while it moved leftward because of advection. In this experiment, whether fingering was observed or not was dependent on the rate of advection. In CCS, whether the fingering occurs or not possibly depends on the rate of groundwater flow and CO2 concentration and it has crucial effect on solubility trapping and mineral trapping. However, there have been few researches of numerical analysis that consider the fingering because of computational load. However, the result of our experiment suggests the importance of simulation including possible fingering processes.