Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirs
CO2 flooding is an economical and efficient enhanced oil recovery technology, however, it is difficult for conventional short core experiments to provide accurate parameters for the later on-site optimization scheme. In this paper, on the basis of long core flooding experiments and applying NMR tech...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/22/e3sconf_isesce2023_01027.pdf |
| _version_ | 1797829422807515136 |
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| author | Tian Feng Li Tiantai |
| author_facet | Tian Feng Li Tiantai |
| author_sort | Tian Feng |
| collection | DOAJ |
| description | CO2 flooding is an economical and efficient enhanced oil recovery technology, however, it is difficult for conventional short core experiments to provide accurate parameters for the later on-site optimization scheme. In this paper, on the basis of long core flooding experiments and applying NMR technology, we quantitatively evaluated the recovery efficiency and remaining oil distribution characteristics by CO2 in low-permeability sandstone reservoirs from a microscopic perspective, and explored the potential of CO2 flooding in low-permeability sandstone reservoirs. Results showed that with the CO2 injection pressure increase, the recovery efficiency of the long core increased and the ultimate recovery was 65.3%. Recovery efficiency of short cores at the inlet, middle and outlet decreases successively, but the change range was not large, and all of them are around the recovery efficiency of long core. In addition, at low injection pressure, almost all CO2 went into the larger pores to replace oil. As increased pressure, the oil started to be produced from the smaller pores, but at 22 MPa, the recovery efficiency in larger pores (76.88%-83.38%) was still higher than that of smaller pores (68.73%-72.74%). Which provided a guide for optimizing the CO2 enhanced oil recovery method in the field. |
| first_indexed | 2024-04-09T13:20:04Z |
| format | Article |
| id | doaj.art-95ba3c58946a460da6a417093e5742b4 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-04-09T13:20:04Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-95ba3c58946a460da6a417093e5742b42023-05-11T09:09:12ZengEDP SciencesE3S Web of Conferences2267-12422023-01-013850102710.1051/e3sconf/202338501027e3sconf_isesce2023_01027Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirsTian Feng0Li Tiantai1School of Petroleum Engineering, Xi’an Shiyou UniversitySchool of Petroleum Engineering, Xi’an Shiyou UniversityCO2 flooding is an economical and efficient enhanced oil recovery technology, however, it is difficult for conventional short core experiments to provide accurate parameters for the later on-site optimization scheme. In this paper, on the basis of long core flooding experiments and applying NMR technology, we quantitatively evaluated the recovery efficiency and remaining oil distribution characteristics by CO2 in low-permeability sandstone reservoirs from a microscopic perspective, and explored the potential of CO2 flooding in low-permeability sandstone reservoirs. Results showed that with the CO2 injection pressure increase, the recovery efficiency of the long core increased and the ultimate recovery was 65.3%. Recovery efficiency of short cores at the inlet, middle and outlet decreases successively, but the change range was not large, and all of them are around the recovery efficiency of long core. In addition, at low injection pressure, almost all CO2 went into the larger pores to replace oil. As increased pressure, the oil started to be produced from the smaller pores, but at 22 MPa, the recovery efficiency in larger pores (76.88%-83.38%) was still higher than that of smaller pores (68.73%-72.74%). Which provided a guide for optimizing the CO2 enhanced oil recovery method in the field.https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/22/e3sconf_isesce2023_01027.pdf |
| spellingShingle | Tian Feng Li Tiantai Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirs E3S Web of Conferences |
| title | Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirs |
| title_full | Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirs |
| title_fullStr | Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirs |
| title_full_unstemmed | Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirs |
| title_short | Recovery efficiency and characteristics of long core by CO2 flooding in low permeability sandstone reservoirs |
| title_sort | recovery efficiency and characteristics of long core by co2 flooding in low permeability sandstone reservoirs |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/22/e3sconf_isesce2023_01027.pdf |
| work_keys_str_mv | AT tianfeng recoveryefficiencyandcharacteristicsoflongcorebyco2floodinginlowpermeabilitysandstonereservoirs AT litiantai recoveryefficiencyandcharacteristicsoflongcorebyco2floodinginlowpermeabilitysandstonereservoirs |