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Collaborating Authors
Results
Sizing Gelant Treatment for Conformance Control in Hydraulically-Fractured Horizontal Wells
Liang, Bin (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University) | Jiang, Hanqiao (China University of Petroleum, Beijing) | Li, Junjian (China University of Petroleum, Beijing) | Li, Min (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University) | Lan, Yuzheng (University of Texas at Austin) | Seright, Randall (New Mexico Petroleum Recovery Research Center)
Abstract Horizontal wells are subject to water breakthrough problems caused by natural or hydraulic fracture connections. Treatment with gelant normally is an effective choice. However, at present, no methods can provide quantitative guidance for designing gelant treatment in fractured horizontal wells. In this paper, we proposed a fracture-conductivity-based analytical model to guide sizing gelant treatment in hydraulically fractured horizontal wells. It includes the evaluation of fracture number intersected with the horizontal well, calculation of gelant leakoff distance according to the desired water productivity reduction, and the method to determine optimal gelant volume. The principle for controlling gelant injection and the method for forecasting water shutoff performance are also included. The successful application is based on two requirements: (1) gelant can penetrate a short distance from fracture surface into adjacent matrices; and (2) gelant or gel can reduce permeability to water more than to hydrocarbon. Finally, we summarize a 9-step procedure for sizing gelant treatment in fractured horizontal wells. This work provides quantitative guidance for water shutoff treatment using cross-linked polymer gels that create disproportionate permeability reduction.
- 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)
- (23 more...)
Injection of Nitrogen Foam for Improved Oil Recovery in Viscous Oil Reservoirs Offshore Bohai Bay China
Liu, Y. M. (China University of Petroleum) | Zhang, L.. (China University of Petroleum) | Ren, S. R. (China University of Petroleum) | Ren, B.. (University of Texas at Austin) | Wang, S. T. (Sinopec Shengli Oilfield Co.) | Xu, G. R. (COSL Production Optimization Division)
Abstract Foam injection is a proven technique for improved oil recovery in both light and heavy oil reservoirs, especially for those with high heterogeneity, in which foam can improve the displacement and sweeping efficiency effectively. In this study, the feasibility of nitrogen foam injection for IOR from viscous oil reservoirs are investigated via laboratory experiments and field pilot analysis. The targeted oilfield is located offshore Bohai Bay (China), featured with high oil viscosity (up to 924 mPa.s) and severe heterogeneity of pay-zones. Water flooding has been applied in the oilfield, but the recovery factor is less than 20% and high water cut (over 85%) has been observed. Nitrogen foam injection was proposed in order to solve the problems and improve oil recovery. In this study, laboratory evaluation of nitrogen foam was conducted via foam testing and sandpack flooding. The results indicate that polymer enhanced foaming agents can greatly increase foam's performance. High blocking capability and displacement efficiency were observed in enhanced foam flooding experiments, indicating that nitrogen foam injection can mitigate the problems of heterogeneity and increase oil recovery in low permeability zones. A field pilot with 2 injectors and 13 producers involved has been conducted to verify the feasibility of the foam technique. The wellhead injection pressure was effectively increased after foam injection, and nearly all producers exhibited good response with incremental oil recovery and the average water cut dropped by 6.3% over 8 months of the field operation. The field pilot demonstrates the effectiveness of the nitrogen foam injection technique as an effective IOR method for the targeted oilfield and other similar oil reservoirs.
- North America > United States (1.00)
- Asia > China (1.00)
- Europe > United Kingdom > North Sea > Central North Sea (0.66)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (1.00)
- Geology > Petroleum Play Type > Unconventional Play > Heavy Oil Play (0.70)
- Asia > China > Shandong > North China Basin > Shengli Field (0.99)
- Asia > China > Jilin > Yanji Basin > Jilin Field (0.99)
- Asia > China > Henan > North China Basin > Zhongyuan Field (0.99)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Conformance improvement (1.00)
- (2 more...)