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Carbon Dioxide Injection for Enhanced Gas Recovery (EGR) and CO2 Sequestration in Natural Gas Reservoirs -Study and Optimization of Effective Parameters

Zangeneh, Hossein | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43635 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed; Soltanieh, Mohammad; Salahshour, Karim
  7. Abstract:
  8. Since the beginning of industrial age the concentration of the greenhouse gases in the atmosphere has increased significantly. This is due to using fossil fuels (oil, gas and coal) exceedingly, leading to higher average temperature of earth and many environmental problems. The critical solution of controlling greenhouse gas emission is replacing other energy resources (for example; solar energy, wind energy and nuclear energy), while considering energy infrastructures shows this is a far solution. An early way for decreasing emission of greenhouse gases in atmosphere is injection of CO2 in geological formations. Moreover, in reservoir and environmental engineering, CO2 injection has been considered as a method of enhancing hydrocarbon recovery for a long time. This process can increase reservoir recovery factor and prevent emission of high amount of carbon dioxide in the atmosphere. While using CO2 for enhancing recovery of oil reservoirs has been subject of several studies in the past decades, it hasn’t been fully studied in the gas reservoirs, mainly because of high recovery factor of gas reservoirs and mixing of the reservoir gas and CO2.In this research effective parameters of Enhanced Gas Recovery/Carbon Capture and Storage (EGR/CCS) has been studied using Design of Experiment (DOE) method and has been optimized by Genetic Algorithm (GA). Finally, the effect of diffusion of CO2 in base gas and carbon dioxide dissolution in reservoir connate water has been studied. This study shows that in addition to the production of residual reservoir gas, injecting CO2 in the gas reservoirs at optimized conditions results in the storage of considerable amount of CO2, and therefore, preventing it from being emitted in the atmosphere. Therefore, as the gas reservoir recovery and revenues of Clean Development Mechanism (CDM) increase, the process of EGR/CCS becomes economically and environmentally profitable.
  9. Keywords:
  10. Carbon Dioxide ; Storage ; Gas Reservoirs ; Enhanced Gas Recovery

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