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Journal of Chemical and Petroleum Engineering
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Volume Volume 53 (2019)
Issue Issue 1
June 2019, Page 1-135
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Zoeir, A., Reyhani, M., Simjoo, M. (2019). To Depict Oil Extraction Efficiency from Gas Invaded Zone: Simulation Study. Journal of Chemical and Petroleum Engineering, 53(1), 11-24. doi: 10.22059/jchpe.2019.264737.1246
Ahmed Zoeir; Mahshid Reyhani; Mohammad Simjoo. "To Depict Oil Extraction Efficiency from Gas Invaded Zone: Simulation Study". Journal of Chemical and Petroleum Engineering, 53, 1, 2019, 11-24. doi: 10.22059/jchpe.2019.264737.1246
Zoeir, A., Reyhani, M., Simjoo, M. (2019). 'To Depict Oil Extraction Efficiency from Gas Invaded Zone: Simulation Study', Journal of Chemical and Petroleum Engineering, 53(1), pp. 11-24. doi: 10.22059/jchpe.2019.264737.1246
Zoeir, A., Reyhani, M., Simjoo, M. To Depict Oil Extraction Efficiency from Gas Invaded Zone: Simulation Study. Journal of Chemical and Petroleum Engineering, 2019; 53(1): 11-24. doi: 10.22059/jchpe.2019.264737.1246

To Depict Oil Extraction Efficiency from Gas Invaded Zone: Simulation Study

Article 2, Volume 53, Issue 1, June 2019, Page 11-24  XML PDF (493.57 K)
Document Type: Research Paper
DOI: 10.22059/jchpe.2019.264737.1246
Authors
Ahmed Zoeir email ; Mahshid Reyhani; Mohammad Simjoo
Faculty of Petroleum and Natural Gas Engineering, Sahand University of Technology, Tabriz, Iran
Abstract
Future exploitation scheme of an oil reservoir in each cycle within its production life depends on the profitability of the current extraction scenario compared with predicted recoveries that acquire with applying other available methods. In fractured reservoirs appropriate time to pass from the gas injection process into chemical enhanced oil recovery (EOR) firmly depends on the oil extraction efficiency within the gas invaded zone. Several variables including fluid characteristic, fracture network and matrix units properties, etc., impact gas-oil gravity drainage (GOGD) performance within the gas invaded zone. In this work, CMG GEM and ECLIPSE 300 were used to simulate GOGD mechanism in several 2D cross-sectional models to investigate effects of the matrix height, matrix rock type, fracture network transmissibility, and miscibility conditions on the oil extraction rate, change of average pressure and producing gas-oil ratio (GOR). Results showed that in small heights of the matrix units especially at compacted rock types, GOGD was weak that caused a rapid decrease in oil production rates and early increase in producing GOR. Results also showed that wherever the matrix porosity and permeability values were high, recovery was accelerated and GOR remained constant for longer exploitation times. Furthermore, using high-pressure lean gas injection for miscible GOGD gives higher extraction efficiencies rather than applying rich or enriched gas.
Keywords
Fractured Reservoir; Gas Invaded Zone; Miscible GOGD; CMG GEM; ECLIPSE 300
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