Abstract

Reduction of hydrocarbon reserves and optimum production is one of major concerns about future of petroleum industry. In the recent years, several enhanced oil recovery methods have been introduced, tested and modified. With increasing methods of improving oil recovery and production techniques, it will be necessary to perform further studies and research to check their feasibility and displacement efficiency. The aim of this research is to study the effect of slug size variation of injection on the displacement efficiency in different scenarios of water alternating CO₂ injection method in a hypothetical reservoir by performing numerical simulations. The results indicate that varying slug size method can yield better performance than fixed water alternating gas ratio, both in terms of recovery factor as well as CO₂ storage. This can open a new look for calculating optimum water alternating gas ratios.

Keywords:

CO2 Injection, enhanced oil recovery , reservoir simulation, sequestration , water alternating gas , water slug size,

References

1. Asghari, K., M. Dong, J. Shire, T.J. Coleridge, J. Nagrampa and J. Grassick, 2007. Development of a correl ation between performance of CO2 flooding and the past performance of waterflooding in weyburn oil field. SPE Prod. Oper., 22(2): 260-264.
   CrossRef    
2. Beecher, C.E. and I.P. Parkhurst, 1926. Effect of dissolved gas upon the viscosity and surface tension of crude oil. T. AIME, 1(26): 51-69.
   CrossRef    
3. Chen, S., H. Li and D. Yang, 2010. Optimization of production performance in a CO2 flooding reservoir under uncertainty. J. Can. Petrol. Technol., 49(2): 71-78.
   CrossRef    
4. Christensen, J.R., E.H. Stenby and A. Skauge, 2001. Review of WAG field experience. SPE Reserv. Eval. Eng., 4(2): 97-106.
   CrossRef    
5. Flaaten, A., Q.P. Nguyen, G.A. Pope and J. Zhang, 2009. A systematic laboratory approach to low-cost, high-performance chemical flooding. SPE Reserv. Eval. Eng., 12(5): 713-723.
   CrossRef    
6. Holm, L.W. and V.A. Josendal, 1974. Mechanisms of oil displacement by carbon dioxide. SPE J. Petrol. Technol., 26(12): 1427-1438.
   CrossRef    
7. Jha, K.N., 1986. A laboratory study of heavy oil recovery with carbon dioxide. J. Can. Petrol. Technol., 25(2).
   CrossRef    
8. Klins, M.A., 1984. Carbon Dioxide Flooding: Basic Mechanisms and Project Design. D. Reidel Publishing Co., Boston.
   
9. Miller, J.S. and R.A. Jones, 1981. A laboratory study to determine physical characteristics of heavy oil after CO2 saturation. Proceeding of SPE/DOE Enhanced Oil Recovery Symposium. Tulsa, Oklahoma.
   CrossRef    
10. Mungan, N., 1981. Carbon dioxide flooding-fundamentals. J. Can. Petrol. Technol., 20(1).
    CrossRef    
11. Righi, E.F. and M.R. Pascual, 2007. Water-alternating-gas pilot in the largest oil field in argentina: Chihuido de la Sierra Negra, Neuquen Basin. Proceeding of Latin American and Caribbean Petroleum Engineering Conference. Buenos Aires, Argentina.
    CrossRef    
12. Rojas, G.A. and S.M. Farouq Ali, 1988. Dynamics of subcritical CO2/brine floods for heavy-oil recovery. SPE Reservoir Eng., 3(1): 35-44.
    CrossRef    
13. Sanchez, N.L., 1999. Management of Water Alternating Gas (WAG) injection projects. Proceeding of Latin American and Caribbean Petroleum Engineering Conference. Caracas, Venezuela.
    CrossRef    
14. Shi, W., J.R. Corwith, A.J. Bouchard, R.L. Bone and E.W. Reinbold, 2008. Kuparuk MWAG project after 20 years. Proceeding of SPE/DOE Symposium on Improved Oil Recovery. Tulsa, Oklahoma, USA.
    CrossRef    
15. Simon, R., A. Rosman and E. Zana, 1978. Phase-behavior properties of CO2-reservoir oil systems. Soc. Petrol. Eng. J., 18(1): 20-26.
    CrossRef    
16. Stoll, M., H. Al-Shureqi, J. Finol, S.A. Al-Harthy, S.N. Oyemade, A.D. Kruijf, J.N.M.V. Wunnik, F. Arkesteijn, R. Bouwmeester and M.J. Faber, 2010. Alkaline-surfactant-polymer flood: From the laboratory to the field. Proceeding of SPE EOR Conference at Oil and Gas West Asia. Muscat, Oman.
    CrossRef    
17. Thomas, S., S.M.F. Ali, J.R. Scoular and B. Verkoczy, 2001. Chemical methods for heavy oil recovery. J. Can. Petrol. Technol., 40(3).
    CrossRef    

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The authors have no competing interests.

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