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Densities for Ternary System of CaCl 2 –H 2 O–CO 2 at Elevated P-T: An Experimental and Modeling Approach

Author

Listed:
  • Alireza Bastami

    (Institute of Petroleum Engineering, University of Tehran, Tehran 14155, Iran)

  • Peyman Pourafshary

    (Department of Petroleum Engineering, School of Mining and Geosciences, Nazarbayev University, Astana 010000, Kazakhstan)

  • Ali Shafiei

    (Department of Petroleum Engineering, School of Mining and Geosciences, Nazarbayev University, Astana 010000, Kazakhstan)

Abstract

Very few thermodynamic models exist for estimation of density alteration due to solution of CO 2 in a pure H 2 O and CaCl 2 –H 2 O system. All of these models require density of CaCl 2 solution to estimate density of CaCl 2 –H 2 O–CO 2 system. Similarly, models presented to calculate CaCl 2 solution density need pure H 2 O density in advance. The main approach to model density of CaCl 2 –H 2 O–CO 2 system is based on estimation of density alteration of CaCl 2 –H 2 O system due to the solution of CO 2 mole fraction. Hence, to estimate CO 2 –CaCl 2 –H 2 O system density, density of CaCl 2 solution is necessary, and to estimate density of CaCl 2 –H 2 O system, density of pure H 2 O is required in advance. Firstly in this paper, density of 0, 1.91, and 4.85 mol/kg CaCl 2 solutions saturated with CO 2 at 328.15 to 375.15 °K and 68.9 to 206.8 Bar were measured through laboratory experiments. Then, a new model is developed to estimate the density of CaCl 2 solutions containing CO 2 based on the experiments conducted in this study. The average and maximum absolute deviations of the new model from the experimental data are 0.0047 and 0.0177, respectively. Hence, the new model combined with other existing models to separately calculate density of the CaCl 2 solution can be used to accurately predict density of the CaCl 2 –H 2 O–CO 2 system in a wide range of P-T applicable for subsurface reservoirs.

Suggested Citation

  • Alireza Bastami & Peyman Pourafshary & Ali Shafiei, 2018. "Densities for Ternary System of CaCl 2 –H 2 O–CO 2 at Elevated P-T: An Experimental and Modeling Approach," Energies, MDPI, vol. 11(10), pages 1-19, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2840-:d:177171
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    References listed on IDEAS

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    1. Ghomian, Yousef & Pope, Gary A. & Sepehrnoori, Kamy, 2008. "Reservoir simulation of CO2 sequestration pilot in Frio brine formation, USA Gulf Coast," Energy, Elsevier, vol. 33(7), pages 1055-1067.
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