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Novel equation for the prediction of rheological parameters of drilling fluids in an annulus / M. Nasiri in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3374–3385 Titre : Novel equation for the prediction of rheological parameters of drilling fluids in an annulus Type de document : texte imprimé Auteurs : M. Nasiri, Auteur ; S. N. Ashrafizadeh, Auteur Année de publication : 2010 Article en page(s) : pp. 3374–3385 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Novel  Equation  Prediction  Rheological  Drilling  Fluids  Annulus Résumé : Several well-known correlations such as the Bingham-plastic, power-law, and Herschel−Bulkley models have been used so far to determine the rheological parameters of drilling fluids. For some particular fluids, however, even a three-parameter model such as Herschel−Bulkley does not exhibit appropriate behavior. On the other hand, determination of the rheological parameters by numerical methods such as nonlinear regression may provide meaningless values, i.e. negative yield stresses. This is particularly notable in determination of yield stress, which identifies the capacity of the drilling fluid to carry the cuttings. In this work, a new equation has been developed which is capable of determining the rheological parameters and, more particularly, the yield stress of drilling fluids. It is demonstrated that the developed correlation improves the prediction of the rheological parameters of the fluids by including a logarithmic term. The velocity profiles and pressure drop values obtained for several drilling fluids in an annulus geometry exhibit the suitability of this novel equation in comparison with the previously mentioned equations. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009233 [article] Novel equation for the prediction of rheological parameters of drilling fluids in an annulus [texte imprimé] / M. Nasiri, Auteur ; S. N. Ashrafizadeh, Auteur . - 2010 . - pp. 3374–3385. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3374–3385 Mots-clés : Novel  Equation  Prediction  Rheological  Drilling  Fluids  Annulus Résumé : Several well-known correlations such as the Bingham-plastic, power-law, and Herschel−Bulkley models have been used so far to determine the rheological parameters of drilling fluids. For some particular fluids, however, even a three-parameter model such as Herschel−Bulkley does not exhibit appropriate behavior. On the other hand, determination of the rheological parameters by numerical methods such as nonlinear regression may provide meaningless values, i.e. negative yield stresses. This is particularly notable in determination of yield stress, which identifies the capacity of the drilling fluid to carry the cuttings. In this work, a new equation has been developed which is capable of determining the rheological parameters and, more particularly, the yield stress of drilling fluids. It is demonstrated that the developed correlation improves the prediction of the rheological parameters of the fluids by including a logarithmic term. The velocity profiles and pressure drop values obtained for several drilling fluids in an annulus geometry exhibit the suitability of this novel equation in comparison with the previously mentioned equations. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009233