A Cyclic Surfactant-Based Imbibition/Solution Gas Drive Process for Low-Permeability, Fractured Reservoirs

1993 ◽  
Author(s):  
R.W. Flumerfelt ◽  
Xiaoyu Li ◽  
J.C. Cox ◽  
Wen-Fu Hsu
Keyword(s):  
Fractured Reservoirs ◽  
Low Permeability ◽  
Solution Gas Drive ◽  
Gas Drive ◽  
Solution Gas

Predicting Effective Permeability to Oil in Sandstone and Carbonate Reservoirs From Well-Logging Data

2011 ◽  
Vol 14 (06) ◽  
pp. 750-762 ◽  
Author(s):  
Nicolas Legrand ◽  
Joop de Kok ◽  
Pascale Neff ◽  
Torsten Clemens
Keyword(s):  
Effective Permeability ◽  
Oil And Gas ◽  
Material Balance ◽  
Total Porosity ◽  
Low Permeability ◽  
Moderate Increase ◽  
Slow Increase ◽  
Solution Gas Drive ◽  
Gas Drive ◽  
Solution Gas

Summary The fractured basement field in Yemen described in this paper is characterized by two types of fracturing: background fractures with a very low effective permeability of less than 0.001 md and fracture corridors with an effective permeability of up to several millidarcies. Except for some dissolution porosity related to fracture corridors, no significant matrix porosity is encountered (total porosity is only 1.15%). Approximately one-half of the oil in place is contained in the fracture corridors and one-half in the background fractures. Production from this field commenced in 2007. It is currently produced by depletion. Compositional grading has been observed in the 3,120-ft oil column. Despite the fact that the oil is close to bubblepoint pressure at the top of the reservoir, a moderate increase in gas/oil ratio (GOR) has been seen. Detailed studies using material balance and discrete-fracture-network (DFN) models revealed that the reason for the slow increase in GOR is the low permeability of the background fractures. The low permeability leads to viscous forces being dominant over gravity forces and, hence, limited gravity segregation of gas and oil. Because of the relatively small viscosity difference between the gas and the oil in this field(µo/µg = 6.5), the gas mobility is not much higher than the oil mobility at low gas saturations. Hence, oil and gas are produced effectively from the background fractures into the fracture corridors and the reservoir pressure is not depleting as fast as in reservoirs with higher viscosity difference between gas and oil. This results in a more effective solution-gas-drive recovery mechanism than that expected for a conventional reservoir. A number of reservoir-management strategies have been investigated. The results indicate that the low permeability of the fracture corridors and very low permeability of the background fractures lead to low recovery factors of 14% for gas injection. However, the efficiency of solution-gas drive is higher than in conventional reservoirs.

A Study of Heavy Oil Solution Gas Drive for Hamaca Field: Depletion Studies and Interpretations

2004 ◽  
Author(s):  
Cengiz Satik ◽  
Carlon Robertson ◽  
Bayram Kalpakci ◽  
Deepak Gupta
Keyword(s):  
Heavy Oil ◽  
Solution Gas Drive ◽  
Gas Drive ◽  
Solution Gas

Analysis Of A Macroscopic Nucleation Model For Simulation Of The Solution Gas Drive In Heavy Oils

2005 ◽  
Author(s):  
Stephane Zaleski ◽  
Fabienne Franco ◽  
Mehdi Chraibi ◽  
Patrick Tardy
Keyword(s):  
Heavy Oils ◽  
Nucleation Model ◽  
Solution Gas Drive ◽  
Gas Drive ◽  
Solution Gas
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