Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions
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<sub>2</sub>/oil flow behavior under these two flooding conditions is insu...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-01-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/14/3/533 |
| _version_ | 1827599249250975744 |
|---|---|
| author | Qingsong Ma Zhanpeng Zheng Jiarui Fan Jingdong Jia Jingjing Bi Pei Hu Qilin Wang Mengxin Li Wei Wei Dayong Wang |
| author_facet | Qingsong Ma Zhanpeng Zheng Jiarui Fan Jingdong Jia Jingjing Bi Pei Hu Qilin Wang Mengxin Li Wei Wei Dayong Wang |
| author_sort | Qingsong Ma |
| collection | DOAJ |
| description | 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<sub>2</sub>/oil flow behavior under these two flooding conditions is insufficient. In this study, we construct pore-scale CO<sub>2</sub>/oil flooding models for various flooding methods and comparatively analyze CO<sub>2</sub>/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<sub>2</sub> sweep area to some extent, but it is still inefficient to displace oil in small pore throats. For miscible flooding, although CO<sub>2</sub> 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<sub>2</sub> diffusivity has little effect on oil recovery enhancement. For immiscible and near-miscible flooding, CO<sub>2</sub> injection velocity needs to be optimized. High CO<sub>2</sub> injection velocity can speed up the oil recovery process while maintaining equivalent oil recovery efficiency for immiscible flooding, and low CO<sub>2</sub> injection velocity may be beneficial to further enhancing oil recovery efficiency under near-miscible conditions. |
| first_indexed | 2024-03-09T04:09:11Z |
| format | Article |
| id | doaj.art-e907d3586ff84baabd192d4c6fca8bd7 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T04:09:11Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-e907d3586ff84baabd192d4c6fca8bd72023-12-03T14:03:08ZengMDPI AGEnergies1996-10732021-01-0114353310.3390/en14030533Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various ConditionsQingsong Ma0Zhanpeng Zheng1Jiarui Fan2Jingdong Jia3Jingjing Bi4Pei Hu5Qilin Wang6Mengxin Li7Wei Wei8Dayong Wang9Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaDepartment of Alternative Energy, Research Institute of Petroleum Exploration & Development, PetroChina, Langfang 065007, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, ChinaMiscible 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<sub>2</sub>/oil flow behavior under these two flooding conditions is insufficient. In this study, we construct pore-scale CO<sub>2</sub>/oil flooding models for various flooding methods and comparatively analyze CO<sub>2</sub>/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<sub>2</sub> sweep area to some extent, but it is still inefficient to displace oil in small pore throats. For miscible flooding, although CO<sub>2</sub> 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<sub>2</sub> diffusivity has little effect on oil recovery enhancement. For immiscible and near-miscible flooding, CO<sub>2</sub> injection velocity needs to be optimized. High CO<sub>2</sub> injection velocity can speed up the oil recovery process while maintaining equivalent oil recovery efficiency for immiscible flooding, and low CO<sub>2</sub> injection velocity may be beneficial to further enhancing oil recovery efficiency under near-miscible conditions.https://www.mdpi.com/1996-1073/14/3/533CO<sub>2</sub>-EORpore-scale simulationheterogeneous porous mediaimmiscible floodingmiscible flooding |
| spellingShingle | Qingsong Ma Zhanpeng Zheng Jiarui Fan Jingdong Jia Jingjing Bi Pei Hu Qilin Wang Mengxin Li Wei Wei Dayong Wang Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions Energies CO<sub>2</sub>-EOR pore-scale simulation heterogeneous porous media immiscible flooding miscible flooding |
| title | Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions |
| title_full | Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions |
| title_fullStr | Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions |
| title_full_unstemmed | Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions |
| title_short | Pore-Scale Simulations of CO<sub>2</sub>/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions |
| title_sort | pore scale simulations of co sub 2 sub oil flow behavior in heterogeneous porous media under various conditions |
| topic | CO<sub>2</sub>-EOR pore-scale simulation heterogeneous porous media immiscible flooding miscible flooding |
| url | https://www.mdpi.com/1996-1073/14/3/533 |
| work_keys_str_mv | AT qingsongma porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT zhanpengzheng porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT jiaruifan porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT jingdongjia porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT jingjingbi porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT peihu porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT qilinwang porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT mengxinli porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT weiwei porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions AT dayongwang porescalesimulationsofcosub2suboilflowbehaviorinheterogeneousporousmediaundervariousconditions |