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Experiments and modeling of volumetric properties and phase behavior for condensate gas under ultra - high - pressure conditions / Chang-Yu Sun in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6916-6925 Titre : Experiments and modeling of volumetric properties and phase behavior for condensate gas under ultra - high - pressure conditions Type de document : texte imprimé Auteurs : Chang-Yu Sun, Auteur ; Huang Liu, Auteur ; Ke-Le Yan, Auteur Année de publication : 2012 Article en page(s) : pp. 6916-6925 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Modeling Résumé : Four reservoir samples under ultra-high-pressure and high-temperature conditions were collected from condensate gas fields in China. Constant-composition expansion tests were performed to determine the phase behavior and volumetric properties of reservoir fluid using an ultra-high-pressure fluid PVT test system. The compressibility factor and dew-point pressure were obtained at four temperatures for four samples. The range of pressure was from 22.03 to 118.89 MPa. For the samples studied, the experimental results showed that the dew-point pressure decreased with increasing temperature and the compressibility factors increased with increasing pressure but decreased with increasing temperature at a given high reduced pressure. A thermodynamic model based on an equation of state was developed to describe the volumetric properties and phase behavior of the condensate gas under ultra-high-pressure conditions. The calculated results are in good accordance with the experimental data, which is important for the development of condensate gas reservoirs in ultra-high-pressure environments. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900245 [article] Experiments and modeling of volumetric properties and phase behavior for condensate gas under ultra - high - pressure conditions [texte imprimé] / Chang-Yu Sun, Auteur ; Huang Liu, Auteur ; Ke-Le Yan, Auteur . - 2012 . - pp. 6916-6925. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6916-6925 Mots-clés : Modeling Résumé : Four reservoir samples under ultra-high-pressure and high-temperature conditions were collected from condensate gas fields in China. Constant-composition expansion tests were performed to determine the phase behavior and volumetric properties of reservoir fluid using an ultra-high-pressure fluid PVT test system. The compressibility factor and dew-point pressure were obtained at four temperatures for four samples. The range of pressure was from 22.03 to 118.89 MPa. For the samples studied, the experimental results showed that the dew-point pressure decreased with increasing temperature and the compressibility factors increased with increasing pressure but decreased with increasing temperature at a given high reduced pressure. A thermodynamic model based on an equation of state was developed to describe the volumetric properties and phase behavior of the condensate gas under ultra-high-pressure conditions. The calculated results are in good accordance with the experimental data, which is important for the development of condensate gas reservoirs in ultra-high-pressure environments. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900245

Thermodynamics model of predicting gas hydrate in porous media based on reaction−adsorption two-step formation mechanism / Li-Tao Chen in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3936–3943 Titre : Thermodynamics model of predicting gas hydrate in porous media based on reaction−adsorption two-step formation mechanism Type de document : texte imprimé Auteurs : Li-Tao Chen, Auteur ; Chang-Yu Sun, Auteur ; Guang-Jin Chen, Auteur Année de publication : 2010 Article en page(s) : pp. 3936–3943 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Thermodynamics  Predicting  Gas  Hydrate  Porous  Adsorption Résumé : A thermodynamics model is improved to predict the hydrate−water−gas equilibria in micropores based on the reaction−adsorption two-step formation mechanism by considering the effect of capillarity. The interfacial tension values between hydrate and water for different gas species are determined by the Gibbs−Thomson relationship or generalized as a linear function of temperatures. The hydrate phase equilibrium conditions for carbon dioxide, methane, ethane, propane, and (6.7% methane + 2.1% ethane + 91.2% propane) gas mixtures in porous media with different pore diameters predicted by the thermodynamics model developed in this work are equivalent to or superior to those of the traditional van der Waals−Platteeuw type models if the interfacial tension values are fixed. The absolute average deviations for all porous media systems can be decreased to 5.08% after a linear relation of interfacial tension and temperatures are introduced. It was found that the interfacial tension values between hydrate and water are in the magnitude order of propane, ethane, carbon dioxide, and methane, which is related to hydrate structure type and the occupancy of linked cavities for different gas species. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901878p [article] Thermodynamics model of predicting gas hydrate in porous media based on reaction−adsorption two-step formation mechanism [texte imprimé] / Li-Tao Chen, Auteur ; Chang-Yu Sun, Auteur ; Guang-Jin Chen, Auteur . - 2010 . - pp. 3936–3943. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3936–3943 Mots-clés : Thermodynamics  Predicting  Gas  Hydrate  Porous  Adsorption Résumé : A thermodynamics model is improved to predict the hydrate−water−gas equilibria in micropores based on the reaction−adsorption two-step formation mechanism by considering the effect of capillarity. The interfacial tension values between hydrate and water for different gas species are determined by the Gibbs−Thomson relationship or generalized as a linear function of temperatures. The hydrate phase equilibrium conditions for carbon dioxide, methane, ethane, propane, and (6.7% methane + 2.1% ethane + 91.2% propane) gas mixtures in porous media with different pore diameters predicted by the thermodynamics model developed in this work are equivalent to or superior to those of the traditional van der Waals−Platteeuw type models if the interfacial tension values are fixed. The absolute average deviations for all porous media systems can be decreased to 5.08% after a linear relation of interfacial tension and temperatures are introduced. It was found that the interfacial tension values between hydrate and water are in the magnitude order of propane, ethane, carbon dioxide, and methane, which is related to hydrate structure type and the occupancy of linked cavities for different gas species. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901878p