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Determination of CO2 minimum miscibility pressure from measured and predicted equilibrium interfacial tensions / Morteza Nobakht ; Samane Moghadam ; Yongan Gu in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8918–8925 Titre : Determination of CO2 minimum miscibility pressure from measured and predicted equilibrium interfacial tensions Type de document : texte imprimé Auteurs : Morteza Nobakht, Auteur ; Samane Moghadam, Auteur ; Yongan Gu, Auteur Année de publication : 2008 Article en page(s) : p. 8918–8925 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : CO2  Minimum Résumé : Accurate determination of the minimum miscibility pressure (MMP) of a crude oil−CO2 system at the actual reservoir temperature is required in order to determine whether CO2 flooding is immiscible or miscible under the actual reservoir pressure. The objective of this study is to determine the MMPs of a crude oil−CO2 system from its measured and predicted equilibrium interfacial tension (IFT) versus equilibrium pressure data at a constant temperature. In the experiment, first, the CO2 solubilities in the crude oil are measured under four different equilibrium pressures. Second, the equilibrium IFTs of the crude oil−CO2 system are measured at 12 different equilibrium pressures and a constant temperature of T = 27 °C by applying the axisymmetric drop shape analysis (ADSA) technique for the pendant drop case. The detailed experimental results show that the CO2 solubility in the crude oil is increased almost linearly with the equilibrium pressure. It is also found that the measured crude oil−CO2 equilibrium IFT is reduced almost linearly with the equilibrium pressure as long as it is lower than a threshold pressure. The measured equilibrium IFT versus equilibrium pressure data are used to determine the MMP of the crude oil−CO2 system by applying the so-called vanishing interfacial tension (VIT) technique. In addition, the equilibrium IFT versus equilibrium pressure data of the crude oil−CO2 system are predicted by using the parachor model and linear gradient theory (LGT) model, respectively. The predicted equilibrium IFT data from each model are also used to determine the MMP of the same crude oil−CO2 system. Comparison of the MMPs determined from the two equilibrium IFT prediction models and that determined from the measured equilibrium IFTs shows that the LGT model is suitable for determining the MMP of the crude oil−CO2 system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800358g [article] Determination of CO2 minimum miscibility pressure from measured and predicted equilibrium interfacial tensions [texte imprimé] / Morteza Nobakht, Auteur ; Samane Moghadam, Auteur ; Yongan Gu, Auteur . - 2008 . - p. 8918–8925. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8918–8925 Mots-clés : CO2  Minimum Résumé : Accurate determination of the minimum miscibility pressure (MMP) of a crude oil−CO2 system at the actual reservoir temperature is required in order to determine whether CO2 flooding is immiscible or miscible under the actual reservoir pressure. The objective of this study is to determine the MMPs of a crude oil−CO2 system from its measured and predicted equilibrium interfacial tension (IFT) versus equilibrium pressure data at a constant temperature. In the experiment, first, the CO2 solubilities in the crude oil are measured under four different equilibrium pressures. Second, the equilibrium IFTs of the crude oil−CO2 system are measured at 12 different equilibrium pressures and a constant temperature of T = 27 °C by applying the axisymmetric drop shape analysis (ADSA) technique for the pendant drop case. The detailed experimental results show that the CO2 solubility in the crude oil is increased almost linearly with the equilibrium pressure. It is also found that the measured crude oil−CO2 equilibrium IFT is reduced almost linearly with the equilibrium pressure as long as it is lower than a threshold pressure. The measured equilibrium IFT versus equilibrium pressure data are used to determine the MMP of the crude oil−CO2 system by applying the so-called vanishing interfacial tension (VIT) technique. In addition, the equilibrium IFT versus equilibrium pressure data of the crude oil−CO2 system are predicted by using the parachor model and linear gradient theory (LGT) model, respectively. The predicted equilibrium IFT data from each model are also used to determine the MMP of the same crude oil−CO2 system. Comparison of the MMPs determined from the two equilibrium IFT prediction models and that determined from the measured equilibrium IFTs shows that the LGT model is suitable for determining the MMP of the crude oil−CO2 system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800358g

Determination of diffusion coefficients and interface mass-transfer coefficients of the crude oil-CO2 system by analysis of the dynamic and equilibrium interfacial tensions / Daoyong Yang in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5447–5455 Titre : Determination of diffusion coefficients and interface mass-transfer coefficients of the crude oil-CO2 system by analysis of the dynamic and equilibrium interfacial tensions Type de document : texte imprimé Auteurs : Daoyong Yang, Auteur ; Yongan Gu, Auteur Année de publication : 2008 Article en page(s) : p. 5447–5455 Note générale : Bibliogr. p. 5454-5455 Langues : Anglais (eng) Mots-clés : Diffusion  coefficients;  Mass-transfer  coefficients;  Crude  oil−CO2  system Résumé : In this paper, a newly developed dynamic interfacial tension method has been applied to simultaneously determine the diffusion coefficients and interface mass-transfer coefficients of the crude oil−CO2 system at high pressures and a constant temperature. Experimentally, the dynamic and equilibrium interfacial tensions of the crude oil−CO2 system are measured by using the axisymmetric drop shape analysis (ADSA) technique for the pendant drop case. Theoretically, a mathematical model is formulated to obtain the time-dependent CO2 concentration distribution inside the pendant oil drop. Then, in terms of a predetermined calibration curve of the measured equilibrium interfacial tension versus the calculated equilibrium CO2 concentration in the crude oil, the dynamic interfacial tension at any time is calculated. Subsequently, an objective function is constructed to express the overall discrepancy between the numerically calculated and the experimentally measured dynamic interfacial tensions at different times. The CO2 diffusion coefficient and the mass-transfer Biot number are used as adjustable parameters and thus determined once the global minimum objective function is achieved. The diffusion coefficient, the mass-transfer Biot number, and the interface mass-transfer coefficient of CO2 mass transfer in a medium crude oil sample at P = 0.1−5.0 MPa and T = 27 °C are found to be 0.47−2.49 × 10−9 m2/s, 2.3−6.8, 0.88−8.41 × 10-5 m/s, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800053d [article] Determination of diffusion coefficients and interface mass-transfer coefficients of the crude oil-CO2 system by analysis of the dynamic and equilibrium interfacial tensions [texte imprimé] / Daoyong Yang, Auteur ; Yongan Gu, Auteur . - 2008 . - p. 5447–5455. Bibliogr. p. 5454-5455 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5447–5455 Mots-clés : Diffusion  coefficients;  Mass-transfer  coefficients;  Crude  oil−CO2  system Résumé : In this paper, a newly developed dynamic interfacial tension method has been applied to simultaneously determine the diffusion coefficients and interface mass-transfer coefficients of the crude oil−CO2 system at high pressures and a constant temperature. Experimentally, the dynamic and equilibrium interfacial tensions of the crude oil−CO2 system are measured by using the axisymmetric drop shape analysis (ADSA) technique for the pendant drop case. Theoretically, a mathematical model is formulated to obtain the time-dependent CO2 concentration distribution inside the pendant oil drop. Then, in terms of a predetermined calibration curve of the measured equilibrium interfacial tension versus the calculated equilibrium CO2 concentration in the crude oil, the dynamic interfacial tension at any time is calculated. Subsequently, an objective function is constructed to express the overall discrepancy between the numerically calculated and the experimentally measured dynamic interfacial tensions at different times. The CO2 diffusion coefficient and the mass-transfer Biot number are used as adjustable parameters and thus determined once the global minimum objective function is achieved. The diffusion coefficient, the mass-transfer Biot number, and the interface mass-transfer coefficient of CO2 mass transfer in a medium crude oil sample at P = 0.1−5.0 MPa and T = 27 °C are found to be 0.47−2.49 × 10−9 m2/s, 2.3−6.8, 0.88−8.41 × 10-5 m/s, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800053d