Geochemical Investigation of CO 2 Injection in Oil and Gas Reservoirs of Middle East to Estimate the Formation Damage and Related Oil Recovery

Ilyas Khurshid and Imran Afgan
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Ilyas Khurshid: Department of Mechanical Engineering, College of Engineering, Khalifa University, Abu Dhabi P.O. Box 12277, United Arab Emirates
Imran Afgan: Department of Mechanical Engineering, College of Engineering, Khalifa University, Abu Dhabi P.O. Box 12277, United Arab Emirates

Energies, 2021, vol. 14, issue 22, 1-16

Abstract: The injection performance of carbon dioxide (CO 2 ) for oil recovery depends upon its injection capability and the actual injection rate. The CO 2 –rock–water interaction could cause severe formation damage by plugging the reservoir pores and reducing the permeability of the reservoir. In this study, a simulator was developed to model the reactivity of injected CO 2 at various reservoir depths, under different temperature and pressure conditions. Through the estimation of location and magnitude of the chemical reactions, the simulator is able to predict the effects of change in the reservoir porosity, permeability (due to the formation/dissolution) and transport/deposition of dissoluted particles. The paper also presents the effect of asphaltene on the shift of relative permeability curve and the related oil recovery. Finally, the effect of CO 2 injection rate is analyzed to demonstrate the effect of CO 2 miscibility on oil recovery from a reservoir. The developed model is validated against the experimental data. The predicted results show that the reservoir temperature, its depth, concentration of asphaltene and rock properties have a significant effect on formation/dissolution and precipitation during CO 2 injection. Results showed that deep oil and gas reservoirs are good candidates for CO 2 sequestration compared to shallow reservoirs, due to increased temperatures that reduce the dissolution rate and lower the solid precipitation. However, asphaltene deposition reduced the oil recovery by 10%. Moreover, the sensitivity analysis of CO 2 injection rates was performed to identify the effect of CO 2 injection rate on reduced permeability in deep and high-temperature formations. It was found that increased CO 2 injection rates and pressures enable us to reach miscibility pressure. Once this pressure is reached, there are less benefits of injecting CO 2 at a higher rate for better pressure maintenance and no further diminution of residual oil.

Keywords: CO 2 sequestration; geochemical reactions; formation damage; oil recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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