Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability Reservoirs
Under the influence of the sedimentation process, the phenomenon of intraformational non-homogeneity is widely observed in low-permeability reservoirs. In the development process of water and gas replacement (WAG), the transport law of water and gas and the distribution of residual oil are seriously...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/17/22/5608 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850216663891312640 |
|---|---|
| author | Mingxi Liu Kaoping Song Longxin Wang Hong Fu Tianhao Wang |
| author_facet | Mingxi Liu Kaoping Song Longxin Wang Hong Fu Tianhao Wang |
| author_sort | Mingxi Liu |
| collection | DOAJ |
| description | Under the influence of the sedimentation process, the phenomenon of intraformational non-homogeneity is widely observed in low-permeability reservoirs. In the development process of water and gas replacement (WAG), the transport law of water and gas and the distribution of residual oil are seriously affected by the non-homogeneity of reservoir properties. In this paper, a study on two types of reservoirs with certain lengths and thicknesses is carried out, and a reasonable development method is proposed according to the characteristics of each reservoir. Firstly, through indoor physical simulation experiments combined with low-field nuclear magnetic resonance scanning (NMR), this study investigates the influence of injection rate and core length on the double-layer low-permeability inhomogeneous core replacement and pore throat mobilization characteristics. Then, a two-layer inhomogeneous low-permeability microscopic model is designed to investigate the model’s replacement and pore throat mobilization characteristics under the combined influence of rhythmites, gravity, the injection rate, etc. Finally, based on the results of the core replacement and numerical simulation, a more reasonable development method is proposed for each type of reservoir. The results show that for inhomogeneous cores of a certain length, the WAG process can significantly increase the injection pressure and effectively seal the high-permeability layer through the Jamin effect to improve the degree of recovery. Moreover, for positive and reverse rhythm reservoirs of a certain thickness, the injection rate can be reduced according to the physical properties of the reservoir, and the gravity overburden phenomenon of the gas is used to achieve the effective development of the upper layers. The effect of the development of a positive rhythm reservoir therefore improved significantly. These findings provide data support for improving the development effectiveness of CO<sub>2</sub> in low-permeability inhomogeneous reservoirs and emphasize the importance of the influence of multiple factors, such as injection flow rate, gravity, and rhythm, in CO<sub>2</sub> replacement. |
| format | Article |
| id | doaj-art-758dec96b59e4ffca232403fedd71c40 |
| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-758dec96b59e4ffca232403fedd71c402025-08-20T02:08:15ZengMDPI AGEnergies1996-10732024-11-011722560810.3390/en17225608Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability ReservoirsMingxi Liu0Kaoping Song1Longxin Wang2Hong Fu3Tianhao Wang4Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, ChinaUnconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, ChinaUnconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, ChinaUnconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, ChinaUnconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, ChinaUnder the influence of the sedimentation process, the phenomenon of intraformational non-homogeneity is widely observed in low-permeability reservoirs. In the development process of water and gas replacement (WAG), the transport law of water and gas and the distribution of residual oil are seriously affected by the non-homogeneity of reservoir properties. In this paper, a study on two types of reservoirs with certain lengths and thicknesses is carried out, and a reasonable development method is proposed according to the characteristics of each reservoir. Firstly, through indoor physical simulation experiments combined with low-field nuclear magnetic resonance scanning (NMR), this study investigates the influence of injection rate and core length on the double-layer low-permeability inhomogeneous core replacement and pore throat mobilization characteristics. Then, a two-layer inhomogeneous low-permeability microscopic model is designed to investigate the model’s replacement and pore throat mobilization characteristics under the combined influence of rhythmites, gravity, the injection rate, etc. Finally, based on the results of the core replacement and numerical simulation, a more reasonable development method is proposed for each type of reservoir. The results show that for inhomogeneous cores of a certain length, the WAG process can significantly increase the injection pressure and effectively seal the high-permeability layer through the Jamin effect to improve the degree of recovery. Moreover, for positive and reverse rhythm reservoirs of a certain thickness, the injection rate can be reduced according to the physical properties of the reservoir, and the gravity overburden phenomenon of the gas is used to achieve the effective development of the upper layers. The effect of the development of a positive rhythm reservoir therefore improved significantly. These findings provide data support for improving the development effectiveness of CO<sub>2</sub> in low-permeability inhomogeneous reservoirs and emphasize the importance of the influence of multiple factors, such as injection flow rate, gravity, and rhythm, in CO<sub>2</sub> replacement.https://www.mdpi.com/1996-1073/17/22/5608low-permeability reservoirintraformational inhomogeneoussupercritical CO<sub>2</sub> replacementrhythmsWAGinjection flow rate |
| spellingShingle | Mingxi Liu Kaoping Song Longxin Wang Hong Fu Tianhao Wang Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability Reservoirs Energies low-permeability reservoir intraformational inhomogeneous supercritical CO<sub>2</sub> replacement rhythms WAG injection flow rate |
| title | Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability Reservoirs |
| title_full | Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability Reservoirs |
| title_fullStr | Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability Reservoirs |
| title_full_unstemmed | Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability Reservoirs |
| title_short | Characteristics of Supercritical CO<sub>2</sub> Non-Mixed Phase Replacement in Intraformational Inhomogeneous Low-Permeability Reservoirs |
| title_sort | characteristics of supercritical co sub 2 sub non mixed phase replacement in intraformational inhomogeneous low permeability reservoirs |
| topic | low-permeability reservoir intraformational inhomogeneous supercritical CO<sub>2</sub> replacement rhythms WAG injection flow rate |
| url | https://www.mdpi.com/1996-1073/17/22/5608 |
| work_keys_str_mv | AT mingxiliu characteristicsofsupercriticalcosub2subnonmixedphasereplacementinintraformationalinhomogeneouslowpermeabilityreservoirs AT kaopingsong characteristicsofsupercriticalcosub2subnonmixedphasereplacementinintraformationalinhomogeneouslowpermeabilityreservoirs AT longxinwang characteristicsofsupercriticalcosub2subnonmixedphasereplacementinintraformationalinhomogeneouslowpermeabilityreservoirs AT hongfu characteristicsofsupercriticalcosub2subnonmixedphasereplacementinintraformationalinhomogeneouslowpermeabilityreservoirs AT tianhaowang characteristicsofsupercriticalcosub2subnonmixedphasereplacementinintraformationalinhomogeneouslowpermeabilityreservoirs |