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Investigation the Optimum Condition for Gas Injection into the Oil Reservoirs by Measuring the Interfacial Tension

Roham, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46065 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Robert, Marc; Taghikhani, Vahid
  7. Abstract:
  8. Interfacial Tension (IFT) as a main parameter for gas flooding efficiency in oil reservoirs depends highly on pressure, temperature, and composition of the reservoir fluids. Therefore, it is important to measure this parameter at real reservoir condition for successful field development plan. In this study, an axisymmetric drop shape analysis (ADSA) has been utilized to measure the equilibrium IFTs in crude oil-flue gas systems at different temperatures and pressures. Moreover, minimum miscibility pressures (MMP) of crude oil/flue gas and crude oil/N2 systems at different temperature levels are determined by applying vanishing interfacial tension (VIT) technique. Then, the effect of oil composition on the crude oil/flue gas IFT behavior is investigated.Then consider to MMP data of crude oil-N2 and crude oil-CO2systems, effect of each component is investigated on the MMP of crude oil/flue gas system.Finally by PVTSim software the MMP simualation was calculated at the experiment temperatures. The following results obtained from this project. The IFT has decreasing trend with temperature in all pressures. The IFT decreases linearly in two distinct pressure ranges. Also, the MMP of crude oil/flue gas was found to decrease linearly with temperature. No obvious phenomenon for asphaltene precipitation in crude oil/flue gas system was observed. Moreover, the higher the molecular weight of heavier components of the crude oil is, the more the value of crude oil/N2 MMP. In addition, the MMP of crude oil/CO2 system is much lower than the MMP of crude oil/flue gas system. Also MMP of crude oil/flue gas system is lower than flue gas/N2 system
  9. Keywords:
  10. Enhanced Oil Recovery ; Gas Injection ; Interfacial Tension

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