Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir
The success of viscoelastic-surfactant (VES) acid in heterogeneous carbonate reservoirs depends on the wormholes propagation and diverting performance of acid. However, with the continuous propagation of wormholes in the high-permeability zone, the highly viscous spent acid enters the low-permeabili...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Energy Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484722011969 |
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| author | Dawei Zhu Yunjin Wang Mingyue Cui Fujian Zhou Ying Zhang Chong Liang Honglan Zou Fei Yao |
| author_facet | Dawei Zhu Yunjin Wang Mingyue Cui Fujian Zhou Ying Zhang Chong Liang Honglan Zou Fei Yao |
| author_sort | Dawei Zhu |
| collection | DOAJ |
| description | The success of viscoelastic-surfactant (VES) acid in heterogeneous carbonate reservoirs depends on the wormholes propagation and diverting performance of acid. However, with the continuous propagation of wormholes in the high-permeability zone, the highly viscous spent acid enters the low-permeability zone under the pressure difference, thus affecting the wormholes propagation and diverting performance of acid in the low-permeability zone, which has been neglected in recent studies. Therefore, in this paper, the rheological model of acid is modified by considering the velocity of VES acid viscosity increase, and a two-scale continuous model was established. Based on this model, the diverting process is described, and reservoir connectivity, permeability contrast, and velocity of acid viscosity increase are used to investigate the influence of spent acid on wormholes propagation and diverting performance of acid in the low-permeability zone. The results show that the formation of wormholes in the high-permeability zone makes a pressure difference between the high-permeability zone and the low-permeability zone. The high viscous spent acid flows from the high permeability layer to the low permeability layer under the pressure difference, thus inhibiting the wormholes propagation and diverting performance of acid in the low-permeability zone of heterogeneous carbonate reservoirs. The influence degree of spent acid is 30.6% when the permeability contrast is 3, and the influence degree decreases with the enhancement of heterogeneity. At permeability contrasts greater than 10, there is almost no effect. The velocity of acid viscosity increase affects the diverting performance of acid, and the faster the viscosity increase, the farther the highly viscous zone formed in a short time, the better its diverting performance. In the VES acid system commonly used in carbonate acidizing, the maximum difference of diverting performance is 4.25 times. The parallel coreflood experiments overestimate the diverting performance of VES acid by about 20%. When selecting the diverting technology for acidizing treatment, the diverting acid system with higher diverting performance in the laboratory experiments or diverting technology with stronger diverting performance can be appropriately selected. In addition, the velocity of spent VES acid viscosity increase is a significant parameter affecting the acid diverting performance. In the low calcite content reservoir or dolomite reservoir, the spent acid viscosity increases relatively slowly due to the slower reaction rate, which will reduce the diverting performance in the reservoir. |
| first_indexed | 2024-04-10T09:10:27Z |
| format | Article |
| id | doaj.art-ec17f07972c34d4e95b143c7295764a4 |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-04-10T09:10:27Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-ec17f07972c34d4e95b143c7295764a42023-02-21T05:12:08ZengElsevierEnergy Reports2352-48472022-11-01883218332Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoirDawei Zhu0Yunjin Wang1Mingyue Cui2Fujian Zhou3Ying Zhang4Chong Liang5Honglan Zou6Fei Yao7Research Institute of Petroleum Exploration & Development, PetroChina, China; Corresponding author at: Research Institute of Petroleum Exploration & Development, PetroChina, China.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China; MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China; Corresponding author at: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China.Research Institute of Petroleum Exploration & Development, PetroChina, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China; MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China; MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, ChinaThe success of viscoelastic-surfactant (VES) acid in heterogeneous carbonate reservoirs depends on the wormholes propagation and diverting performance of acid. However, with the continuous propagation of wormholes in the high-permeability zone, the highly viscous spent acid enters the low-permeability zone under the pressure difference, thus affecting the wormholes propagation and diverting performance of acid in the low-permeability zone, which has been neglected in recent studies. Therefore, in this paper, the rheological model of acid is modified by considering the velocity of VES acid viscosity increase, and a two-scale continuous model was established. Based on this model, the diverting process is described, and reservoir connectivity, permeability contrast, and velocity of acid viscosity increase are used to investigate the influence of spent acid on wormholes propagation and diverting performance of acid in the low-permeability zone. The results show that the formation of wormholes in the high-permeability zone makes a pressure difference between the high-permeability zone and the low-permeability zone. The high viscous spent acid flows from the high permeability layer to the low permeability layer under the pressure difference, thus inhibiting the wormholes propagation and diverting performance of acid in the low-permeability zone of heterogeneous carbonate reservoirs. The influence degree of spent acid is 30.6% when the permeability contrast is 3, and the influence degree decreases with the enhancement of heterogeneity. At permeability contrasts greater than 10, there is almost no effect. The velocity of acid viscosity increase affects the diverting performance of acid, and the faster the viscosity increase, the farther the highly viscous zone formed in a short time, the better its diverting performance. In the VES acid system commonly used in carbonate acidizing, the maximum difference of diverting performance is 4.25 times. The parallel coreflood experiments overestimate the diverting performance of VES acid by about 20%. When selecting the diverting technology for acidizing treatment, the diverting acid system with higher diverting performance in the laboratory experiments or diverting technology with stronger diverting performance can be appropriately selected. In addition, the velocity of spent VES acid viscosity increase is a significant parameter affecting the acid diverting performance. In the low calcite content reservoir or dolomite reservoir, the spent acid viscosity increases relatively slowly due to the slower reaction rate, which will reduce the diverting performance in the reservoir.http://www.sciencedirect.com/science/article/pii/S2352484722011969Heterogeneous carbonate reservoirWormholes propagationDiverting performanceSpent VES acidSimulation |
| spellingShingle | Dawei Zhu Yunjin Wang Mingyue Cui Fujian Zhou Ying Zhang Chong Liang Honglan Zou Fei Yao Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir Energy Reports Heterogeneous carbonate reservoir Wormholes propagation Diverting performance Spent VES acid Simulation |
| title | Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir |
| title_full | Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir |
| title_fullStr | Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir |
| title_full_unstemmed | Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir |
| title_short | Effects of spent viscoelastic-surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir |
| title_sort | effects of spent viscoelastic surfactant acid flow on wormholes propagation and diverting performance in heterogeneous carbonate reservoir |
| topic | Heterogeneous carbonate reservoir Wormholes propagation Diverting performance Spent VES acid Simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2352484722011969 |
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