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Experimental and Modeling Study of Gas/WAG Injection at Near Miscible Condition in One of Iranian Oil Reservoirs

Shahrokhi, Omid | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42547 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Massihi, Mohsen
  7. Abstract:
  8. Most of the Iranian oil reservoirs are reaching end of their natural production life, hence they are suitable candidates for EOR common processes like gas injection and WAG injection. Studies have shown that gas and WAG injection can be applied for optimal oil production. Past studies have been mainly on gas and WAG injection in immiscible or fully miscible conditions and there is a limited amount of data available on performance of these methods in near miscible conditions. Miscible injection is not feasible in old Iranian oil reservoirs due to their depleted pressure. Moreover injection in lower pressures is attractive from both economical and operational standpoints since this reduces the costs of gas purchase and compression. In this project nitrogen was used for immiscible WAG injection in Berea sandstone and carbon dioxide for near miscible gas and WAG injection in sandstone samples from one of Iranian oil reservoirs. The effect of different parameters such as WAG ratio and injection rate on oil recovery was studied. In immiscible conditions results showed an optimal WAG ratio of two but in near miscible conditions the ratio of one showed superior results than other ratios and also continuous gas injection. Better mass transfer between CO2 and oil phase in near miscible conditions made the lowest injection rate (0.3ml/min) the proper one but in immiscible conditions higher rates showed better performance. Other part of this project involved preparation and tuning of a PVT model for the oil according to experimental data. This model was used in a reservoir simulation process. This simulation model was applied for studying the effect of slug size, ratio of water injection rate to that of gas and also the effect the first fluid injected in each cycle
  9. Keywords:
  10. Water Alternative Gas (WAG)Injection ; Carbon Dioxide ; Compositional Simulation ; Experimental Data ; Near Miscible Condition

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