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Laboratory Investigation of Rock Wettability and Interfacial Tension Effects on Relative Permeability, a Quantitative Study

Yassin, Mahmoud Reza | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45034 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Taghikhani, Vahid; Ayatollahi, Shahab; Rostami, Behzad
  7. Abstract:
  8. About 20% of total oil in the world is reserved in fractured reservoirs and there is also more than 60% of remained oil in the world in these reservoirs. But increasing recovery factor and production from this type of reservoirs was not very successful. After water flooding process most of the oil remains in the reservoir. The amount of remained oil is much more specially in fractured reservoirs. Surfactant flooding in one of the well-known enhanced oil recovery methods for reduction of interfacial tension between fluids to decrease capillary forces that cause less oil trapping and higher oil recovery. But a comprehensive and accurate understanding of the mechanism of this process and effects of different factors such as type, concentration, adsorption, temperature, wettability alteration ability, phase behavior and salinity of surfactant solution is still investigated by researchers. The efficiency of this enhanced oil recovery method is a function of phase behavior and salinity of the surfactant solution. On the other hand phase behavior directly affects the two phase oil and water relative permeability. In the first part of this research an advanced instrument in institute of petroleum engineering was utilized to record water saturation profile in water flooding. After calculating saturation profile versus time we used MATLAB software for history matching experimental and simulation data in order to obtain relative permeability. Calculated relative permeability by this method is able to predict experimental oil production and pressure drop with suitable accuracy. At the end of this part we investigate shortcomings of this apparatus for solutions consisting surfactant.
    In the second part of this research the effect of microemulsion type on surfactant flooding in porous media is investigated. At first we carry out salinity scan for cationic surfactant C16-TAB and then the effect of Winsor type (I), (III) and (II) on oil recovery factor, differential pressure, relative permeability and relative permeability ratio will be studied. To do a comprehensive study we used homogenous and similar sandstone and carbonate rocks and finally the effect of wettability alteration and dynamic surfactant adsorption was investigated. The results of oil recovery factor showed that Winsor type (I) and (III) are more efficient than Winsor type (II). In addition lower pressure drop in Winsor type (I) makes it more appropriate than Winsor type (III) from mobility ratio point of view
  9. Keywords:
  10. Phase Behavior ; Flamingo ; X Ray Diffraction ; Water Saturation ; Surfactant Flooding ; Microemulsion ; Relative Permeability ; Enhanced Oil Recovery

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