TY - JOUR
T1 - Impacts of CO2 injection speed on two-phase flow and physical parameters in porous sandstone
AU - Kitamura, Keigo
AU - Honda, Hiroyuki
AU - Nishizawa, Osamu
AU - Mitani, Yasuhiro
N1 - Funding Information:
This study was supported by JSPS KAKENHI Grant Number JP17H01291, JP25289331. We also acknowledge the support of WPI-I2CNER of Kyushu University, sponsored by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT). We would like to thank Shinnosuke Takaki and Mitsunori Imasato of Kyushu university for their dedicated laboratory works. KK is also grateful to Takeshi Tsuji and Tatsunori Ikeda of WPI-I2CNER of Kyushu University for fruitful discussion and the guidance of wave data processing.
Funding Information:
This study was supported by JSPS KAKENHI Grant Number JP17H01291 , JP25289331 . We also acknowledge the support of WPI-I2CNER of Kyushu University, sponsored by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) . We would like to thank Shinnosuke Takaki and Mitsunori Imasato of Kyushu university for their dedicated laboratory works. KK is also grateful to Takeshi Tsuji and Tatsunori Ikeda of WPI-I2CNER of Kyushu University for fruitful discussion and the guidance of wave data processing.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/5
Y1 - 2021/5
N2 - We conducted a comprehensive experimental study on the effect of the CO2 injection rate (flow rate: represented by the macroscopic capillary number, Nc) on CO2 saturation (SCO2) and the CO2 distribution in porous, brine-saturated Berea sandstone. We measured two independent geophysical parameters, P-wave velocity (Vp) and electrical resistivity (ρ*), to monitor the two-phase flow. Vp showed clear dependency on SCO2 in the transition zone between the capillary limit (CL) and the viscous limit (VL), but not near the CL. The Vp−SCO2 relationship showed that the characteristic size of connected CO2 volumes decreased with increasing Nc, whereas resistivity increased continuously with increasing SCO2. Therefore, resistivity is sensitive to SCO2 under flow conditions between the CL and VL. The ρ*–SCO2 relationship showed that CO2 penetration increased with increasing Nc. These results indicate that we can use Vp and ρ* to monitor CO2 flow in pore spaces because the injected CO2 forms pathways and replaces brine under a wide range of Nc values.
AB - We conducted a comprehensive experimental study on the effect of the CO2 injection rate (flow rate: represented by the macroscopic capillary number, Nc) on CO2 saturation (SCO2) and the CO2 distribution in porous, brine-saturated Berea sandstone. We measured two independent geophysical parameters, P-wave velocity (Vp) and electrical resistivity (ρ*), to monitor the two-phase flow. Vp showed clear dependency on SCO2 in the transition zone between the capillary limit (CL) and the viscous limit (VL), but not near the CL. The Vp−SCO2 relationship showed that the characteristic size of connected CO2 volumes decreased with increasing Nc, whereas resistivity increased continuously with increasing SCO2. Therefore, resistivity is sensitive to SCO2 under flow conditions between the CL and VL. The ρ*–SCO2 relationship showed that CO2 penetration increased with increasing Nc. These results indicate that we can use Vp and ρ* to monitor CO2 flow in pore spaces because the injected CO2 forms pathways and replaces brine under a wide range of Nc values.
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U2 - 10.1016/j.ijggc.2020.103228
DO - 10.1016/j.ijggc.2020.103228
M3 - Article
AN - SCOPUS:85100436948
SN - 1750-5836
VL - 107
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
M1 - 103228
ER -