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Experimental Investigation of the Effect of Pressure and Gas Composition on the Interfacial Behavior of Gas/Oil System under High Pressure High Temperature Conditions

Meghrazi, Emad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55211 (06)
  4. University: Sharif University of Technolog
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fatemi, Mobeen; Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. Gas injection process is one of the main methods to increase the hydrocarbon reservoirs. Minimum Miscibility pressure is a key parameter that controls the efficiency of the gas injection process. It depends on the temperature, the composition of the injected gas and the composition of the reservoir fluids. In this study, the interfacial tension of the live oil-gas system of one of the reservoirs of southwestern Iran was obtained by analyzing the Pendant drop method at 225 ° F and different pressures, and then by using the Vanishing Interfacial Tension method, the Minimum Miscibility Pressure has been computed .In this study, pure and base gases such as nitrogen, methane and injection gas of reservoir have been used to increase production efficiency, also to improve the miscibility, methane gas with different percentages of normal hexane (nC6 20%,10%) carbon dioxide (CO2 5%) and a combination of carbon dioxide and normal hexane (CO2 20%,nC6 10%,) as well as the injection gas of reservoir with different percentages of NGL(10%,15%, 25%,15%) ,LPG (5%,10%) is enriched and used as an injection fluid to live oil samples. In the Vanishing Interfacial Tension method, by plotting an interfacial tension diagram at each pressure and extrapolating it to the value of zero interfacial tension, the minimum miscibility pressure for that system is calculated. According to the results of the laboratory method, it was observed that with increasing pressure and also the amount of enrichment of injection gas, the amount of interfacial tension of the live oil-gas system has decreased and in some cases even miscibility has been reached. In order to validate the methods for calculating the minimum mixing pressure in industrial software, the output value of these soft wares has been compared with laboratory values.The simulation results indicate that the multiple mixing cell method has a higher accuracy in calculating the minimum mixing pressure. Existing correlations have been used to estimate the minimum miscibility pressure of the live oil gas system. Among these relationships, the relationships of Pedrood, Firoozabadi (corrected) and Kuo (corrected) show closer results to the values of the minimum miscibility pressure obtained by the laboratory method.
  9. Keywords:
  10. Enhanced Oil Recovery ; Gas Injection ; Minimum Miscibility Pressure (MMP) ; Interfacial Tension ; Vanishing Interfacial Tension Method ; High Pressure High Temperature (HPHT)

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