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Experimental Investigation on the Effect of Porous Media Wettability on Trapping and Hysteresis in Water/Oil Two Phase Flow System

Firoozi, Mehdi | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52634 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fatemi, Mobeen; Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. Wettability of reservoir rock is one of the effective parameters in determining the mechanisms of production and consequently the amount of residual oil inside the porous media. In addition, the salinity of injected water is important factor in the recovery of reservoir oil in waterflooding.On the other hand, the role of the hysteresis on the residual oil saturation as well as the flow functions such as relative permeability curves is very important. In this project, the effects of reservoir wettability and injected water salinity on the hysteresis and residual oil saturation in two-phase water-oil flow systems are studied. Core-scale experiments were carried out using sandpacks and were studied by recording the required data, relative permeability diagrams in different states. Observations showed that by changing the initial wettability of the core from water-wet to mixed-wet, the amount of oil recovery and residual saturation decreased. The hysteresis on water relative permeability also increases and decreases in the oil phase. At constant wettability and with decreasing salinity, the oil recovery decreases and residual oil saturation increase. The hysteresis on water relative permeability also decreased and increased for the oil phase with decreasing salinity in the water-wet sample. But in the mixed-wet sample, a slight upward trend for the water phase and a slightly decreasing trend for the oil phase is observed. The type of hysteresis effect for two mixed-wet cores is observed near the Killough model and in two water-wet samples observed very close to the Land model and the Carlson model
  9. Keywords:
  10. Wettability ; Trapping ; Hysteresis ; Relative Permeability ; Salinity ; Residual Saturation

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