Behavior of CO2/water flow in porous media for CO2geological storage.
A clear understanding of two-phase fluid flow properties in porous media is of importance to CO2geological storage. The study visually measured the immiscible and miscible displacement of water by CO2using MRI (magnetic resonance imaging), and investigated the factor influencing the displacement process in porous media which were filled with quartz glass beads. For immiscible displacement at slow flow rates, the MR signal intensity of images increased because of CO2dissolution; before the dissolution phenomenon became inconspicuous at flow rate of 0.8mLmin-1. For miscible displacement, the MR signal intensity decreased gradually independent of flow rates, because supercritical CO2and water became miscible in the beginning of CO2injection. CO2channeling or fingering phenomena were more obviously observed with lower permeable porous media. Capillary force decreases with increasing particle size, which would increase permeability and allow CO2and water to invade into small pore spaces more easily. The study also showed CO2flow patterns were dominated by dimensionless capillary number, changing from capillary finger to stable flow. The relative permeability curve was calculated using Brooks-Corey model, while the results showed the relative permeability of CO2slightly decreases with the increase of capillary number.
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China; Research Institute of Innovative Technology for the Earth, Kizugawa City, Kyoto 619-0292, Japan.
Lanlan
L
Jiang
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China.
Minghao
M
Yu
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China. Electronic address: liuyu@dlut.edu.cn.
Yu
Y
Liu
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China.
Mingjun
M
Yang
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China.
Yi
Y
Zhang
Research Institute of Innovative Technology for the Earth, Kizugawa City, Kyoto 619-0292, Japan.
Ziqiu
Z
Xue
Department of Energy Sciences, Tokyo Institute Technology, Nagatsuta, Yokohama 226-8502, Japan.
Tetsuya
T
Suekane
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China. Electronic address: songyc@dlut.edu.cn.
Yongchen
Y
Song
D002245:Carbon Dioxide / Q000737:chemistry*; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods*; D057446:Hydrodynamics; D008279:Magnetic Resonance Imaging / Q000379:methods*; D016062:Porosity; D012212:Rheology / Q000295:instrumentation* / Q000379:methods; D014867:Water / Q000737:chemistry*
D014867:Water; D002245:Carbon Dioxide
CO(2) geological storage; Capillary number; MRI; Relative permeability; Residual water saturation