2021 Fiscal Year Final Research Report
Development of Digital Rock Method to Elucidate the Behavior of CO2-Oil-Water System in Porous Media for Low Salinity EOR
Project/Area Number |
19K15100
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 22040:Hydroengineering-related
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Research Institution | Yamaguchi University |
Principal Investigator |
Jiang Fei 山口大学, 大学院創成科学研究科, 准教授 (60734358)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 多孔質媒体 / 多相流 / 石油増産 |
Outline of Final Research Achievements |
After the East Japan Earthquake, we still have to rely on the fossil energy resources. Recently, the low-salinity enhanced oil recovery (LS-EOR) method, which can reduce costs and increase oil recovery at the same time, has been attracting attention. Various theories have been proposed regarding the oil-recovery mechanism of the LS-EOR method, but the mechanism has not yet been fully elucidated. In this study, we developed a multi-physics model at pore scale and constructed a large-scale digital rock simulator to quantitatively evaluate the recovery enhancement of LS-EOR, taking into account the effects of reservoir rock pore structure geometry, fluid properties, and other factors. Based on the lattice Boltzmann method, an innovative fluid simulation method, a physico-chemical model of interfacial phenomena was integrated to clarify the mechanism of rock pore-scale oil-recovery enhancement.
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Free Research Field |
流体力学
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Academic Significance and Societal Importance of the Research Achievements |
本研究では大規模pore scaleシミュレーターを開発することで実験では時間的・コスト面から実現が困難あるいは不可能な条件下の異なる岩石種類における低濃度塩水攻法シナリオを容易に再現することができるようになった。この手法の確立によって、初めて岩石コアレベルの増産効率が評価でき、かつpore scale分解能をもつシミュレーターが完成できた。更に、計算結果の分析によって、低濃度塩水攻法のメカニズムの理解及び原油回収率の向上に影響を与える重要な要素がより明確になった。
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