2020 Fiscal Year Annual Research Report
二酸化炭素地下貯留における貯留メカニズムの学術基盤構築
| Project/Area Number |
20J14975
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
PATMONOAJI Anindityo 東京工業大学, 工学院, 特別研究員(DC2)
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| Project Period (FY) |
2020-04-24 – 2022-03-31
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| Keywords | multiphaseflow / porous media / fluid displacement / capillary trapping / dissolution / carbon sequestration |
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| Outline of Annual Research Achievements |
Throughout this year, we focus on the investigation under room pressure and temperature.
The characteristics of fluid displacement structure was investigated under different fluid pairs viscosity and velocity, which is based on non-dimensional number of capillary number (Ca) and viscosity ratio (M). We successfully make the first displacement pattern diagram based on 3D observation of fluid displacement in porous media. The results of this investigations were summarized and published in two international journals in early and mid-2020.
The capillary trapping characteristics inside porous media were investigated under different porous media and fluid displacement characteristics. We formulated two morphological model of trapped phase clusters under various porous media characteristics. This affects the interfacial area of the trapped phase that is used for dissolution mass transfer process. The results of this investigations were summarized and published in two international journals in late-2018 and late-2020.
The dissolution mass transfer was investigated by varying the porous media characteristics, fluid flow, and trapped phase properties. Throughout this investigation, we observed the phenomenon of dissolution fingering and developed a model of mass transfer coefficient based on non-dimensional model of Sherwood number (Sh), Reynolds number (Re), and Schmidt number (Sc). The results of this investigations were summarized and published in two international journals in late-2017 and early-2021 and a chapter of a book.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The research is progressing properly. We have finished most of the experiments for the condition of room pressure and temperature. We have investigated the characteristics of porous media, fluid displacement, capillary trapping, and eventually dissolution mass transfer by using the X-ray microcomputed tomography in Suekane Laboratory. In addition, we also started using the method of micromodel observation with optical camera for more detail observation. For now, we are preparing the next project to investigate strategies to improve the amount of trapping based on our results in those characterization. We are also trying to broaden our project by implementing machine learning for the characterization.
Most of the analysis and findings have been published as academicals papers in various international journals and also as a book chapter. However, due to the current pandemic condition, collaboration with other institutions cannot be performed easily because of the restriction. In addition, many overseas and domestic conferences were cancelled. In the incoming years, we will put more effort to deliver our findings to the communities.
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| Strategy for Future Research Activity |
In this financial year, we will focus more on numerical simulation to validate the theory that we develop in previous experimental works. For the numerical simulation, we will mainly used Lattice-Boltzmann method and pore network simulation.
We are preparing the next project to investigate strategies to improve the amount of trapping based on our results in those characterization. Mainly, we will try to improve the capillary trapping and increase the dissolution mass transfer.
We are also trying to broaden our project by implementing machine learning for the characterization of porous media properties,such as permeability, and also the fluid displacement process. We are planning to use the combination convolutional neural networks from the raw digital image of the porous media and the pore-throat networks extracted by using our watershed method.
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