Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir
The low-permeability reservoirs have abundant reserves and broad development prospects, and the supplementary energy methods have gradually become a hot research topic. In addition, the technology of enhanced oil recovery through supercritical CO 2 injection is becoming increasingly mature; however,...
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ftdoajarticles:oai:doaj.org/article:0172914666a44092bcb81e2769d45d93 2023-11-12T04:15:47+01:00 Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir Guohui Qu Xuebin Tian Yikun Liu Bowen Li Xiunan Li 2023-09-01T00:00:00Z https://doi.org/10.3390/en16196813 https://doaj.org/article/0172914666a44092bcb81e2769d45d93 EN eng MDPI AG https://www.mdpi.com/1996-1073/16/19/6813 https://doaj.org/toc/1996-1073 doi:10.3390/en16196813 1996-1073 https://doaj.org/article/0172914666a44092bcb81e2769d45d93 Energies, Vol 16, Iss 6813, p 6813 (2023) low-permeability supercritical CO 2 huff-n-puff permeability porosity wettability viscosity Technology T article 2023 ftdoajarticles https://doi.org/10.3390/en16196813 2023-10-15T00:35:40Z The low-permeability reservoirs have abundant reserves and broad development prospects, and the supplementary energy methods have gradually become a hot research topic. In addition, the technology of enhanced oil recovery through supercritical CO 2 injection is becoming increasingly mature; however, the changes in reservoir properties at the microscopic level still need further investigation. In this study, natural rock cores from low-permeability reservoirs were used to simulate reservoir conditions and conduct supercritical CO 2 injection experiments for energy supplementation. The study aimed to investigate the changes in reservoir microstructure, minerals, and crude oil properties before and after the experiments. The research results indicate that after supercritical CO 2 injection into the reservoir, it dissolves in the formation water to form carbonic acid. Under the effect of dissolution, the porosity of the low-permeability reservoir increases by 1.06–5.68%, and permeability can be improved by 40–60%. The rock becomes more water-wet and less oil-wet. The content of calcite and feldspar in the rock minerals decreases due to the dissolution of carbonic acid, resulting in a reduction in plagioclase and calcite. After the CO 2 injection, the light components (C 8 –C 10 ) in the crude oil in the rock cores decreased by approximately 14.6%, while the heavy components (C 16 –C 39 ) increased by 6.99%. The viscosity of the crude oil decreases, and its flowability is further enhanced. Article in Journal/Newspaper Carbonic acid Directory of Open Access Journals: DOAJ Articles Energies 16 19 6813 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
low-permeability supercritical CO 2 huff-n-puff permeability porosity wettability viscosity Technology T |
spellingShingle |
low-permeability supercritical CO 2 huff-n-puff permeability porosity wettability viscosity Technology T Guohui Qu Xuebin Tian Yikun Liu Bowen Li Xiunan Li Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir |
topic_facet |
low-permeability supercritical CO 2 huff-n-puff permeability porosity wettability viscosity Technology T |
description |
The low-permeability reservoirs have abundant reserves and broad development prospects, and the supplementary energy methods have gradually become a hot research topic. In addition, the technology of enhanced oil recovery through supercritical CO 2 injection is becoming increasingly mature; however, the changes in reservoir properties at the microscopic level still need further investigation. In this study, natural rock cores from low-permeability reservoirs were used to simulate reservoir conditions and conduct supercritical CO 2 injection experiments for energy supplementation. The study aimed to investigate the changes in reservoir microstructure, minerals, and crude oil properties before and after the experiments. The research results indicate that after supercritical CO 2 injection into the reservoir, it dissolves in the formation water to form carbonic acid. Under the effect of dissolution, the porosity of the low-permeability reservoir increases by 1.06–5.68%, and permeability can be improved by 40–60%. The rock becomes more water-wet and less oil-wet. The content of calcite and feldspar in the rock minerals decreases due to the dissolution of carbonic acid, resulting in a reduction in plagioclase and calcite. After the CO 2 injection, the light components (C 8 –C 10 ) in the crude oil in the rock cores decreased by approximately 14.6%, while the heavy components (C 16 –C 39 ) increased by 6.99%. The viscosity of the crude oil decreases, and its flowability is further enhanced. |
format |
Article in Journal/Newspaper |
author |
Guohui Qu Xuebin Tian Yikun Liu Bowen Li Xiunan Li |
author_facet |
Guohui Qu Xuebin Tian Yikun Liu Bowen Li Xiunan Li |
author_sort |
Guohui Qu |
title |
Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir |
title_short |
Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir |
title_full |
Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir |
title_fullStr |
Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir |
title_full_unstemmed |
Effects of Changes in Physical Properties of Porous Media and Fluid under Supercritical CO 2 Huff-n-Puff in Low-Permeability Reservoir |
title_sort |
effects of changes in physical properties of porous media and fluid under supercritical co 2 huff-n-puff in low-permeability reservoir |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/en16196813 https://doaj.org/article/0172914666a44092bcb81e2769d45d93 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Energies, Vol 16, Iss 6813, p 6813 (2023) |
op_relation |
https://www.mdpi.com/1996-1073/16/19/6813 https://doaj.org/toc/1996-1073 doi:10.3390/en16196813 1996-1073 https://doaj.org/article/0172914666a44092bcb81e2769d45d93 |
op_doi |
https://doi.org/10.3390/en16196813 |
container_title |
Energies |
container_volume |
16 |
container_issue |
19 |
container_start_page |
6813 |
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1782333054798266368 |