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Pore-Scale Simulations of CO 2 /Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions

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  • Qingsong Ma

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Zhanpeng Zheng

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Jiarui Fan

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Jingdong Jia

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Jingjing Bi

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Pei Hu

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Qilin Wang

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Mengxin Li

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Wei Wei

    (Department of Alternative Energy, Research Institute of Petroleum Exploration & Development, PetroChina, Langfang 065007, China)

  • Dayong Wang

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

Abstract

Miscible and near-miscible flooding are used to improve the performance of carbon-dioxide-enhanced oil recovery in heterogeneous porous media. However, knowledge of the effects of heterogeneous pore structure on CO 2 /oil flow behavior under these two flooding conditions is insufficient. In this study, we construct pore-scale CO 2 /oil flooding models for various flooding methods and comparatively analyze CO 2 /oil flow behavior and oil recovery efficiency in heterogeneous porous media. The simulation results indicate that compared to immiscible flooding, near-miscible flooding can increase the CO 2 sweep area to some extent, but it is still inefficient to displace oil in small pore throats. For miscible flooding, although CO 2 still preferentially displaces oil through big throats, it may subsequently invade small pore throats. In order to substantially increase oil recovery efficiency, miscible flooding is the priority choice; however, the increase of CO 2 diffusivity has little effect on oil recovery enhancement. For immiscible and near-miscible flooding, CO 2 injection velocity needs to be optimized. High CO 2 injection velocity can speed up the oil recovery process while maintaining equivalent oil recovery efficiency for immiscible flooding, and low CO 2 injection velocity may be beneficial to further enhancing oil recovery efficiency under near-miscible conditions.

Suggested Citation

  • Qingsong Ma & Zhanpeng Zheng & Jiarui Fan & Jingdong Jia & Jingjing Bi & Pei Hu & Qilin Wang & Mengxin Li & Wei Wei & Dayong Wang, 2021. "Pore-Scale Simulations of CO 2 /Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions," Energies, MDPI, vol. 14(3), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:533-:d:484075
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    References listed on IDEAS

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    1. Ting Chen & Zhengming Yang & Yutian Luo & Wei Lin & Jiaxiang Xu & Yunhong Ding & Jialiang Niu, 2018. "Evaluation of Displacement Effects of Different Injection Media in Tight Oil Sandstone by Online Nuclear Magnetic Resonance," Energies, MDPI, vol. 11(10), pages 1-16, October.
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    1. Dmitrii Pereponov & Michael Tarkhov & Desmond Batsa Dorhjie & Alexander Rykov & Ivan Filippov & Elena Zenova & Vladislav Krutko & Alexey Cheremisin & Evgeny Shilov, 2023. "Microfluidic Studies on Minimum Miscibility Pressure for n-Decane and CO 2," Energies, MDPI, vol. 16(13), pages 1-21, June.

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