Library Subscription: Guest
Home Archives Thermal Letter Officers Future meetings Assembly for International Heat Transfer Conferences
International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

CO2 Trapping Phenomena in Porous Media of Geological Storage by Lattice Boltzmann Method

Suguru Uemura
Tokyo Institute of Technology, Department of Mechanical and Control Engineering, 2-12-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan

Atsuto Noda
Tokyo Institute of Technology, Department of Mechanical and Control Engineering, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Shohji Tsushima
Department of Mechanical Engineering, Osaka University, 2-1 Yamadaoka, Suita-shi, Osaka 565-0871, Japan

Shuichiro Hirai
Tokyo Institute of Technology, Department of Mechanical and Control Engineering, 2-12-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan

DOI: 10.1615/IHTC15.pmd.009359
pages 6927-6936


KEY WORDS: Porous media, Carbon emission mitigation, CO2 geological storage, porous media, two-phase flow, Lattice Boltzmann Method

Abstract

The geological storage of carbon dioxide (CO2) will be vital in achieving future reductions in CO2 emissions. Deep saline aquifers are major candidate sites for CO2 sequestration, because of their enormous storage potentials. However, buoyancy-driven migration of CO2 in an aquifer is still an important issue in the evaluation of storage sites and assessment of CO2 leakage risks and storage costs. Many studies have focused on imbibition or drainage phenomena; however, buoyancy-driven flow and dynamic behavior of CO2 on the micro-scale were not addressed, because real-time experimental observation was quite difficult. In this study, the buoyancy-driven CO2 migration process is studied with the lattice Boltzmann method, with the advantage of modeling two-phase flow in porous media. With the advantage of the LBM, the dynamic migration and trapping process of a CO2 droplet is studied microscopically, and droplet behaviors are evaluated by capillary pressure. CO2 size was mimicked by varying the gravitational coefficient. The migration process associated with snap-off is also discussed. Initially large volumes of CO2 migrate upward, accompanied by snap-off phenomena caused by small fluctuations of slice-averaged porosity. The buoyancy effect of the CO2 plume is divided by the snap-off, and CO2 bubbles are stably trapped in the porous media by the capillary effect. The CO2 trapping condition is addressed by defining Bond number Bo, and Bo', and the relation between pore throat structure and trappable CO2 height is explained.

Purchase $25.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page