CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs
Shale oil resources are abundant, but reservoirs exhibit strong heterogeneity with extremely low porosity and permeability, and their development is challenging. Carbon dioxide (CO 2 ) injection technology is crucial for efficient shale oil development. When CO 2 is dissolved in reservoir formation...
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ftdoajarticles:oai:doaj.org/article:76d398dd372e41c882a3bdfc006d8927 2024-02-27T08:39:37+00:00 CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs Sheng Cao Qian Sang Guozhong Zhao Yubo Lan Dapeng Dong Qingzhen Wang 2024-01-01T00:00:00Z https://doi.org/10.3390/en17020477 https://doaj.org/article/76d398dd372e41c882a3bdfc006d8927 EN eng MDPI AG https://www.mdpi.com/1996-1073/17/2/477 https://doaj.org/toc/1996-1073 doi:10.3390/en17020477 1996-1073 https://doaj.org/article/76d398dd372e41c882a3bdfc006d8927 Energies, Vol 17, Iss 2, p 477 (2024) shale formation CO 2 flooding CO 2 –water–rock reaction blocking action dissolution reaction Technology T article 2024 ftdoajarticles https://doi.org/10.3390/en17020477 2024-01-28T01:43:03Z Shale oil resources are abundant, but reservoirs exhibit strong heterogeneity with extremely low porosity and permeability, and their development is challenging. Carbon dioxide (CO 2 ) injection technology is crucial for efficient shale oil development. When CO 2 is dissolved in reservoir formation water, it undergoes a series of physical and chemical reactions with various rock minerals present in the reservoir. These reactions not only modify the reservoir environment but also lead to precipitation that impacts the development of the oil reservoir. In this paper, the effects of water–rock interaction on core porosity and permeability during CO 2 displacement are investigated by combining static and dynamic tests. The results reveal that the injection of CO 2 into the core leads to reactions between CO 2 and rock minerals upon dissolution in formation water. These reactions result in the formation of new minerals and the obstruction of clastic particles, thereby reducing core permeability. However, the generation of fine fractures through carbonic acid corrosion yields an increase in core permeability. The CO 2 –water–rock reaction is significantly influenced by the PV number, pressure, and temperature. As the injected PV number increases, the degree of pore throat plugging gradually increases. As the pressure increases, the volume of larger pore spaces gradually decreases, resulting in an increase in the degree of pore blockage. However, when the pressure exceeds 20 MPa, the degree of carbonic acid dissolution will be enhanced, resulting in the formation of small cracks and an increase in the volume of small pores. As the temperature reaches the critical point, the degree of blockage of macropores gradually increases, and the blockage of small pores also occurs, which eventually leads to a decrease in core porosity. Article in Journal/Newspaper Carbonic acid Directory of Open Access Journals: DOAJ Articles Energies 17 2 477 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
shale formation CO 2 flooding CO 2 –water–rock reaction blocking action dissolution reaction Technology T |
spellingShingle |
shale formation CO 2 flooding CO 2 –water–rock reaction blocking action dissolution reaction Technology T Sheng Cao Qian Sang Guozhong Zhao Yubo Lan Dapeng Dong Qingzhen Wang CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs |
topic_facet |
shale formation CO 2 flooding CO 2 –water–rock reaction blocking action dissolution reaction Technology T |
description |
Shale oil resources are abundant, but reservoirs exhibit strong heterogeneity with extremely low porosity and permeability, and their development is challenging. Carbon dioxide (CO 2 ) injection technology is crucial for efficient shale oil development. When CO 2 is dissolved in reservoir formation water, it undergoes a series of physical and chemical reactions with various rock minerals present in the reservoir. These reactions not only modify the reservoir environment but also lead to precipitation that impacts the development of the oil reservoir. In this paper, the effects of water–rock interaction on core porosity and permeability during CO 2 displacement are investigated by combining static and dynamic tests. The results reveal that the injection of CO 2 into the core leads to reactions between CO 2 and rock minerals upon dissolution in formation water. These reactions result in the formation of new minerals and the obstruction of clastic particles, thereby reducing core permeability. However, the generation of fine fractures through carbonic acid corrosion yields an increase in core permeability. The CO 2 –water–rock reaction is significantly influenced by the PV number, pressure, and temperature. As the injected PV number increases, the degree of pore throat plugging gradually increases. As the pressure increases, the volume of larger pore spaces gradually decreases, resulting in an increase in the degree of pore blockage. However, when the pressure exceeds 20 MPa, the degree of carbonic acid dissolution will be enhanced, resulting in the formation of small cracks and an increase in the volume of small pores. As the temperature reaches the critical point, the degree of blockage of macropores gradually increases, and the blockage of small pores also occurs, which eventually leads to a decrease in core porosity. |
format |
Article in Journal/Newspaper |
author |
Sheng Cao Qian Sang Guozhong Zhao Yubo Lan Dapeng Dong Qingzhen Wang |
author_facet |
Sheng Cao Qian Sang Guozhong Zhao Yubo Lan Dapeng Dong Qingzhen Wang |
author_sort |
Sheng Cao |
title |
CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs |
title_short |
CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs |
title_full |
CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs |
title_fullStr |
CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs |
title_full_unstemmed |
CO 2 –Water–Rock Interaction and Its Influence on the Physical Properties of Continental Shale Oil Reservoirs |
title_sort |
co 2 –water–rock interaction and its influence on the physical properties of continental shale oil reservoirs |
publisher |
MDPI AG |
publishDate |
2024 |
url |
https://doi.org/10.3390/en17020477 https://doaj.org/article/76d398dd372e41c882a3bdfc006d8927 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Energies, Vol 17, Iss 2, p 477 (2024) |
op_relation |
https://www.mdpi.com/1996-1073/17/2/477 https://doaj.org/toc/1996-1073 doi:10.3390/en17020477 1996-1073 https://doaj.org/article/76d398dd372e41c882a3bdfc006d8927 |
op_doi |
https://doi.org/10.3390/en17020477 |
container_title |
Energies |
container_volume |
17 |
container_issue |
2 |
container_start_page |
477 |
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1792046668954206208 |