Documents disponibles écrits par cet auteur

Rheology of foamed cement / R. M. Ahmed in Cement and concrete research, Vol. 39 N° 4 (Avril 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 4 (Avril 2009) . - pp. 353–361 Titre : Rheology of foamed cement Type de document : texte imprimé Auteurs : R. M. Ahmed, Auteur Année de publication : 2009 Article en page(s) : pp. 353–361 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Rheology  ;  Characterization  ;  Transport  properties  ;  Foam  cement  ;  Oil  well  cement Résumé : Foams are being used in a number of petroleum industry applications that exploit their high viscosity and low density. Foamed cement slurries can have superior displacement properties relative to non-foamed cement slurries. This article presents results of an experimental study of foamed cement rheology. Viscosity curves of foamed cements were obtained using a flow-through rotational viscometer. Foamed cements with different foam qualities were generated under different pressures using a foam generator/viscometer apparatus. The foam qualities during the tests ranged from 0% to 30%, and the shear rate varied between 5 s− 1 and 600 s− 1. Experimental results indicate that: i) unlike conventional aqueous foams, low-quality cement foams have a lower viscosity than the base fluid; ii) as the cement foam quality (gas volumetric fraction) increases from 10% to 30%, the viscosity also increases; and iii) the viscosity of low-quality cement foam slightly increases after depressurization or expansion. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608002226 [article] Rheology of foamed cement [texte imprimé] / R. M. Ahmed, Auteur . - 2009 . - pp. 353–361. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 4 (Avril 2009) . - pp. 353–361 Mots-clés : Rheology  ;  Characterization  ;  Transport  properties  ;  Foam  cement  ;  Oil  well  cement Résumé : Foams are being used in a number of petroleum industry applications that exploit their high viscosity and low density. Foamed cement slurries can have superior displacement properties relative to non-foamed cement slurries. This article presents results of an experimental study of foamed cement rheology. Viscosity curves of foamed cements were obtained using a flow-through rotational viscometer. Foamed cements with different foam qualities were generated under different pressures using a foam generator/viscometer apparatus. The foam qualities during the tests ranged from 0% to 30%, and the shear rate varied between 5 s− 1 and 600 s− 1. Experimental results indicate that: i) unlike conventional aqueous foams, low-quality cement foams have a lower viscosity than the base fluid; ii) as the cement foam quality (gas volumetric fraction) increases from 10% to 30%, the viscosity also increases; and iii) the viscosity of low-quality cement foam slightly increases after depressurization or expansion. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884608002226