Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its Application
For low-permeability reservoirs, water-flooding development is usually adopted, which leads to induced fractures near the wellbore, increasing reservoir heterogeneity, and making water-flooding development more complex. This paper focuses on low-permeability reservoirs, considering the characteristi...
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2024-11-01
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| author | Jianxiong Li Kai Wang Sheng Su Kejun Huang Haoran Feng Ziyi Jin Cong Peng Jinbao Liu Pin Jia |
| author_facet | Jianxiong Li Kai Wang Sheng Su Kejun Huang Haoran Feng Ziyi Jin Cong Peng Jinbao Liu Pin Jia |
| author_sort | Jianxiong Li |
| collection | DOAJ |
| description | For low-permeability reservoirs, water-flooding development is usually adopted, which leads to induced fractures near the wellbore, increasing reservoir heterogeneity, and making water-flooding development more complex. This paper focuses on low-permeability reservoirs, considering the characteristics of induced fractures and elliptic-flow composite, and the well-test model for injection wells is established. The mathematical model in Laplace space is obtained through dimensionless transformation and Laplace transformation. Subsequently, the Mathieu function is introduced to obtain the bottom hole pressure, and the pressure response curve is drawn. The six flow stages of the curve are defined, and the sensitivity of parameters such as half-length of induced fractures, range of lateral-swept area, permeability in unswept area, and outer boundary distance at constant pressure are analyzed. The results show that the half-length of the fracture mainly affects the linear flow of the fracture, the range of the lateral wave-affected area mainly affects the radial flow of the swept area, the permeability of the unswept area mainly affects the radial flow of the unswept area, and the outer boundary distance at constant pressure mainly affects the boundary flow. Based on the production performance of a certain injection well in J Oilfield, a series of key parameters are obtained through analytical solution model inversion, including the induced-fracture half-length of 10.32 m, the lateral-swept range of elliptic partition flow of 128.95 m, the permeability of the swept area of 6.87 mD, and the mobility ratio of 119.92, which show the superiority of the analytical solution model. |
| format | Article |
| id | doaj-art-ead89b6eda3b497f9ff067f821646812 |
| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-ead89b6eda3b497f9ff067f8216468122025-08-20T01:53:45ZengMDPI AGEnergies1996-10732024-11-011722566310.3390/en17225663Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its ApplicationJianxiong Li0Kai Wang1Sheng Su2Kejun Huang3Haoran Feng4Ziyi Jin5Cong Peng6Jinbao Liu7Pin Jia8The 4th Oil Production Plant of Changqing Oilfield Branch of CNPC, Yinchuan 750005, ChinaThe 4th Oil Production Plant of Changqing Oilfield Branch of CNPC, Yinchuan 750005, ChinaThe 4th Oil Production Plant of Changqing Oilfield Branch of CNPC, Yinchuan 750005, ChinaThe 4th Oil Production Plant of Changqing Oilfield Branch of CNPC, Yinchuan 750005, ChinaCollege of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaPetroChina Southwest Oil and Gas Field Company, Sichuan Shale Gas Exploration and Development Co., Ltd., Chengdu 610057, ChinaCollege of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaCollege of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaCollege of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaFor low-permeability reservoirs, water-flooding development is usually adopted, which leads to induced fractures near the wellbore, increasing reservoir heterogeneity, and making water-flooding development more complex. This paper focuses on low-permeability reservoirs, considering the characteristics of induced fractures and elliptic-flow composite, and the well-test model for injection wells is established. The mathematical model in Laplace space is obtained through dimensionless transformation and Laplace transformation. Subsequently, the Mathieu function is introduced to obtain the bottom hole pressure, and the pressure response curve is drawn. The six flow stages of the curve are defined, and the sensitivity of parameters such as half-length of induced fractures, range of lateral-swept area, permeability in unswept area, and outer boundary distance at constant pressure are analyzed. The results show that the half-length of the fracture mainly affects the linear flow of the fracture, the range of the lateral wave-affected area mainly affects the radial flow of the swept area, the permeability of the unswept area mainly affects the radial flow of the unswept area, and the outer boundary distance at constant pressure mainly affects the boundary flow. Based on the production performance of a certain injection well in J Oilfield, a series of key parameters are obtained through analytical solution model inversion, including the induced-fracture half-length of 10.32 m, the lateral-swept range of elliptic partition flow of 128.95 m, the permeability of the swept area of 6.87 mD, and the mobility ratio of 119.92, which show the superiority of the analytical solution model.https://www.mdpi.com/1996-1073/17/22/5663low-permeability reservoirinduced fractureelliptic-flow compositewell-test model |
| spellingShingle | Jianxiong Li Kai Wang Sheng Su Kejun Huang Haoran Feng Ziyi Jin Cong Peng Jinbao Liu Pin Jia Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its Application Energies low-permeability reservoir induced fracture elliptic-flow composite well-test model |
| title | Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its Application |
| title_full | Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its Application |
| title_fullStr | Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its Application |
| title_full_unstemmed | Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its Application |
| title_short | Well-Test Interpretation Model of Water-Injection Well in a Low-Permeability Reservoir and Its Application |
| title_sort | well test interpretation model of water injection well in a low permeability reservoir and its application |
| topic | low-permeability reservoir induced fracture elliptic-flow composite well-test model |
| url | https://www.mdpi.com/1996-1073/17/22/5663 |
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