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Determination of antiscaling efficiency and dissolution capacity for calcium carbonate with ultrasonic irradiation / Xiaoli Li in Industrial & engineering chemistry research, Vol. 51 N° 27 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9266–9274 Titre : Determination of antiscaling efficiency and dissolution capacity for calcium carbonate with ultrasonic irradiation Type de document : texte imprimé Auteurs : Xiaoli Li, Auteur ; Jianguo Zhang, Auteur ; Daoyong Yang, Auteur Année de publication : 2012 Article en page(s) : pp. 9266–9274 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Calcium  carbonate  Ultrasonic  irradiation Résumé : A systematic technique has been developed to determine antiscaling efficiency and dissolution capacity for calcium carbonate in oilfield brines under various ultrasonic treating conditions. During the static experiments, effects of ultrasonic frequency, acoustic intensity, treating time, and water level on the antiscaling efficiency have been evaluated, while the underlying antiscaling mechanism is identified and determined. Physically, the formation of calcium carbonate is promoted as a result of the decreased molecular force and accelerated movement of salty ions under ultrasonic irradiation. Most of the formed scale is found to loosely suspend in the liquid, rather than tightly adhere to the solid surface. During the dynamic experiments, orthogonal tests have been designed to examine effects of interval time, treating time, and flow velocity on antiscaling efficiency. As for the dissolution experiment, dissolution capacity is measured to evaluate the effect of ultrasonic frequency on dissolution of the formed calcium carbonate. The antiscaling efficiency is found to achieve its maximum value of 81.1%, using the ultrasonic treatment with a frequency of 28 kHz, an acoustic intensity of 0.61 W/cm2, an interval time of 2 h, a treatment time of 15 min, and a flow velocity of 1.8 m/s. It is also found that dissolution capacity does not impose a dominant effect on scale prevention and that the highest dissolution capacity of 19.3% is obtained with an ultrasonic frequency of 28 kHz. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300575v [article] Determination of antiscaling efficiency and dissolution capacity for calcium carbonate with ultrasonic irradiation [texte imprimé] / Xiaoli Li, Auteur ; Jianguo Zhang, Auteur ; Daoyong Yang, Auteur . - 2012 . - pp. 9266–9274. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9266–9274 Mots-clés : Calcium  carbonate  Ultrasonic  irradiation Résumé : A systematic technique has been developed to determine antiscaling efficiency and dissolution capacity for calcium carbonate in oilfield brines under various ultrasonic treating conditions. During the static experiments, effects of ultrasonic frequency, acoustic intensity, treating time, and water level on the antiscaling efficiency have been evaluated, while the underlying antiscaling mechanism is identified and determined. Physically, the formation of calcium carbonate is promoted as a result of the decreased molecular force and accelerated movement of salty ions under ultrasonic irradiation. Most of the formed scale is found to loosely suspend in the liquid, rather than tightly adhere to the solid surface. During the dynamic experiments, orthogonal tests have been designed to examine effects of interval time, treating time, and flow velocity on antiscaling efficiency. As for the dissolution experiment, dissolution capacity is measured to evaluate the effect of ultrasonic frequency on dissolution of the formed calcium carbonate. The antiscaling efficiency is found to achieve its maximum value of 81.1%, using the ultrasonic treatment with a frequency of 28 kHz, an acoustic intensity of 0.61 W/cm2, an interval time of 2 h, a treatment time of 15 min, and a flow velocity of 1.8 m/s. It is also found that dissolution capacity does not impose a dominant effect on scale prevention and that the highest dissolution capacity of 19.3% is obtained with an ultrasonic frequency of 28 kHz. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300575v

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

Determination of water-in-oil emulsion viscosity in porous media / Mohamed Arhuoma in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7092–7102 Titre : Determination of water-in-oil emulsion viscosity in porous media Type de document : texte imprimé Auteurs : Mohamed Arhuoma, Auteur ; Mingzhe Dong, Auteur ; Daoyong Yang, Auteur Année de publication : 2009 Article en page(s) : pp. 7092–7102 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Water-in-oil  emulsions  Porous  media Résumé : Experiments have been conducted to determine the viscosities of water-in-oil (W/O) emulsions in porous media. W/O emulsions were first prepared for different volume fractions of the dispersed phase and then characterized for their properties and rheological parameters including flow index and consistency constant. All prepared W/O emulsions with volume fractions between 6.78% and 33.48% were found to behave as non-Newtonian shear-thinning fluids at fairly high viscosities. The viscosities of the emulsions were measured during emulsion flow in three types of sandpacks. A correlation of the viscosities of the W/O emulsions in porous media was developed by performing a regression on the experimentally measured data. The newly developed correlation was validated, and a sensitivity analysis was performed to examine the effects of tortuosity and emulsion quality. The emulsion quality has a dominant effect on the viscosity of the W/O emulsions and has been included in the correlation for the first time to achieve accurate predictions of the viscosities of W/O emulsions in porous media. The existing correlations for oil-in-water (O/W) emulsions provide underestimated predictions for the viscosities of W/O emulsions, whereas the droplet size distribution does not have a significant impact on the viscosity of the W/O emulsions tested in this study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801818n [article] Determination of water-in-oil emulsion viscosity in porous media [texte imprimé] / Mohamed Arhuoma, Auteur ; Mingzhe Dong, Auteur ; Daoyong Yang, Auteur . - 2009 . - pp. 7092–7102. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7092–7102 Mots-clés : Water-in-oil  emulsions  Porous  media Résumé : Experiments have been conducted to determine the viscosities of water-in-oil (W/O) emulsions in porous media. W/O emulsions were first prepared for different volume fractions of the dispersed phase and then characterized for their properties and rheological parameters including flow index and consistency constant. All prepared W/O emulsions with volume fractions between 6.78% and 33.48% were found to behave as non-Newtonian shear-thinning fluids at fairly high viscosities. The viscosities of the emulsions were measured during emulsion flow in three types of sandpacks. A correlation of the viscosities of the W/O emulsions in porous media was developed by performing a regression on the experimentally measured data. The newly developed correlation was validated, and a sensitivity analysis was performed to examine the effects of tortuosity and emulsion quality. The emulsion quality has a dominant effect on the viscosity of the W/O emulsions and has been included in the correlation for the first time to achieve accurate predictions of the viscosities of W/O emulsions in porous media. The existing correlations for oil-in-water (O/W) emulsions provide underestimated predictions for the viscosities of W/O emulsions, whereas the droplet size distribution does not have a significant impact on the viscosity of the W/O emulsions tested in this study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801818n