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Collaborating Authors
Results
Synergetic CO2 Huff-n-Puff for Edge-Water Fault-Block Reservoir: Experimental and Numerical Simulation
Hao, Hongda (China University of Petroleum) | Hou, Jirui (China University of Petroleum) | Zhao, Fenglan (China University of Petroleum) | Wang, Zhixing (China University of Petroleum) | Fu, Zhongfeng (China University of Petroleum) | Li, Wengfeng (China University of Petroleum) | Wang, Peng (China University of Petroleum) | Zhang, Meng (China University of Petroleum) | Lu, Guoyong (China University of Petroleum) | Zhou, Jian (China University of Petroleum)
Abstract As an effective method for resource utilization, CO2 huff-n-puff can be utilized to reduce CO2 emissions and enhance oil recovery in edge-water flock-block reservoir, which was implemented in Jidong Oil Field, China since 2008 with oil production of 6.5ร10 bbls by 2015. During operation period, synergetic effect was observed in adjacent wells with water cut drops and oil increments in a horizontal well group. Experimental and numerical simulations were conducted to investigate synergetic mechanisms of CO2 huff-n-puff. 3D physical models with a horizontal well group and edge-water-driving system were established in laboratory to simulate the edge-water fault-block reservoir. The formation mechanisms and influence factors of synergetic CO2 huff-n-puff were studied through laboratory experiments. Base reservoir model was also built to further discuss the synergetic types and injection allocations for CO2 huff-n-puff in horizontal well group. Synergetic CO2 huff-n-puff is a smart gas cycling strategy for the horizontal well group to balance the formation pressure and replace the interwell oil. Experimental and numerical results showed that after CO2 injected into low tectonic position of the reservoir, synergetic effect could be observed in high position well with water cut drops and oil increments. The mechanisms of synergetic effect can be recognized as formation energy supplement, gas sweeping, gravity segregation and CO2-assisted edge-water driving. The stratigraphic dip and heterogeneity are advantages for the formation of synergetic effect. The synergetic types of CO2 huff-n-puff can be summarized as single-well synergy and multi-well synergy. For single-well synergy, edge-water invasion can be effectively controlled by energy supplement after CO2 injected into relatively low position well. For multi-well synergy, better synergetic effect and remaining oil replacement can be achieved after gas injected through different positions of the well group. The development efficiency of synergetic CO2 huff-n-puff can be enlarged with 700t CO2 injected into low position well + 100t CO2 into high position well, and about 5767.9 bbls oil of the well group could be recovered with the soaking time of 50d.
- North America > United States > Texas (1.00)
- Asia > China (1.00)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (26 more...)
Performance Improvement of CO2-EOR By Production Control in a Heterogeneous 3D Model: Experimental and Numerical Simulation
Zhao, Fenglan (China University of Petroleum) | Hao, Hongda (China University of Petroleum) | Wang, Zhixing (China University of Petroleum) | Hou, Jirui (China University of Petroleum) | Fu, Zhongfeng (China University of Petroleum) | Li, Wenfeng (China University of Petroleum) | Wang, Peng (China University of Petroleum) | Zhang, Meng (China University of Petroleum) | Lu, Guoyong (China University of Petroleum) | Lv, Guangzhong (Institute of Exploration and Development, Shengli Oil Field, SINOPEC)
Abstract CO2-EOR is an effective technology for reducing CO2 emissions while enhancing oil recovery in ultra-low permeability reservoir, which has been performed in Shengli Oil Field, China since 2013 with cumulative CO2 injection of 12588 t by 2016. However, the area heterogeneity of reservoir resulted in serious gas channeling and poor production performance. Performance control methods including sweeping area regulation, differential pressure control and real-time producing regulation were proposed to enlarge sweeping area and improve CO2 utilization in areal heterogenous reservoir. 3D physical models of areal heterogeneity and five-spot pattern were utilized in the laboratory. Conventional CO2 flooding, sweeping area regulation, differential production pressure control and real-time producing regulation were conducted respectively in the 3D models, and the flooding efficiency was evaluated through oil recovery increments and changes of performance curves. Corescale numerical modeling was also built to study the profile improvements of CO2 flooding by the performance control methods. Experimental and numerical simulation results showed that CO2 was displaced unevenly in the areal heterogeneous reservoir, leaving plenty of oil remained in the relatively high and relatively low permeability area. The oil recovery of CO2 flooding in areal heterogenous reservoir can be doubled by performance control methods of sweeping area regulation, differential pressure control or real-time producing regulation. The remaining oil in relatively low permeability area can be effectively displaced by sweeping area regulation, while both larger sweeping area and better CO2 flooding profile can be achieved by differential pressure control and real-time producing regulation. Higher productivity of individual well can be obtained in the early and middle stage of CO2 flooding by differential pressure control, while similar oil & gas production performance and longer displacement period of CO2 injection can be achieved by real-time producing regulation. The performance improvement of CO2 flooding by performance control methods provided a feasible technical strategy for enhancing oil recovery of areal heterogeneous reservoir in the oil field under the condition of a lower oil price.
- North America > United States > Texas (0.28)
- Asia > China > Shandong Province (0.25)
- North America > United States > Louisiana (0.25)
- North America > Canada > Saskatchewan > Williston Basin > Weyburn Field > Mission Canyon Formation (0.99)
- North America > Canada > Saskatchewan > Williston Basin > Weyburn Field > Madison Formation (0.99)
- North America > Canada > Saskatchewan > Williston Basin > Weyburn Field > Forbisher Formation (0.99)
- (2 more...)