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Experimental Investigation of Enhanced Oil Recovery Using N2 Alternating CO2 Gas Injection

Rezaei, Morteza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41133 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Vossoughi, Manoochehr; Shadizadeh, Reza; Kharrat, Riaz; Ghazanfari, Mohammad
  7. Abstract:
  8. Gas injection is a well-known enhanced recovery method which can improve recovery using two different displacement processes, miscible and immiscible. Typical non-hydrocarbon gases which have been utilized in these processes are carbon-dioxide and nitrogen. These gases are usually injected separately and have been rarely utilized together as a tertiary recovery process.
    In this paper, we have focused on sequential carbon-dioxide and nitrogen gas injection as a novel EOR method. The periodic injections of carbon-dioxide and nitrogen have been repeated for six injection pore volumes. Sensitivity analysis of injection pressure, injection volume and injection rate have been also investigated in coreflood experiments. The results have revealed that miscible carbon-dioxide injection has the highest recovery percentage, when nitrogen is only injected as an immiscible gas rather than near miscible or immiscible carbon-dioxide. It has been also shown that increasing miscible carbon-dioxide to nitrogen ratio will results in ultimate recovery percentage increase. It can also be achieved that decreasing gas rates will lead us to reach a higher ultimate recovery value. This novel method has also been compared with typical EOR methods namely water, miscible WAG, miscible and immiscible carbon-dioxide, and immiscible nitrogen injection using a commercial compositional simulator
  9. Keywords:
  10. Enhanced Oil Recovery ; Carbon Dioxide ; Nitrogen ; Miscible Injection ; Immiscible Injection

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