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Reza Veisi, Mohsen | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39990 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Ghotbi, Siroos; Ayatollahi, Shahabedin
Abstract:
In water drive or waterflooded reservoirs, a significant amount of oil is remained in the reservoir as the residual oil. A process known as gas assisted gravity drainage, in its tertiary mode, has been applied in a number of conventional reservoirs to recover this residual oil. Gravity drainage is the main mechanism of oil recovery in the gas assisted gravity drainage enhanced oil recovery process. Previous investigations has shown that gravity force, spreading coefficient, three phase capillary pressure and reservoir wettability have significant effect on oil recovered via this process. The feasibility of using such a process in a naturally fractured reservoir is investigated in this work by conducting a series of experiments in a fractured model composed of artificial porous media. Effect of gas injection on increasing oil recovery beyond that of waterflood process, the role of fractures in oil recovery, and effects of wettability on oil recovery are investigated in this work. The differences between mechanisms of oil recovery in fractured and nonfractured models are also investigated in this work.
Keywords:
Enhanced Oil Recovery ; Fractured Reservoirs ; Water Flooding ; Gas Injection ; Gravity Drainage Mechanism

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