A Nonlinear Viscoelastic Model for the Yielding of Gelled Waxy Crude Oil
Sun, Mengran (China University of Petroleum-Beijing)
Wang, Zhihui (China Huanqiu Contracting and Engineering Co.)
Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física)

Fecha:	2021
Resumen:	We explore some rheological aspects of the yielding of gelled waxy crude oil on the basis of a fractal model for the structural description of the waxy gel and Marrucci's model for the time evolution of the stress with mixed elastic and viscous effects. With some parameters of the model directly obtained from classic rheometry, and others by fitting the parameters to the experimental data of one shear-rate condition, the flow curves for another shear-rate condition are predicted. Both theoretical curves-the fitting and the predicted ones-share the basic features of the experimental ones. Comparison with results of Maxwell model shows that Marrucci's model used here leads to much better results, as it incorporates nonlinear viscoelasticity of waxy crude gels in the stress evolution equation. The strain dependence of the elastic modulus also plays a relevant role on the prediction of the model, suggesting a double-network contribution for very small strain values. Due to the inertia of rheometric device, the actual shear rate is often found to depart from the setting one, and modification of shear rate history can be necessary in model validation.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Nonlinear viscoelasticity ; Rheological model ; Waxy crude oil ; Yielding ; Fractal gels
Publicado en:	Energies, Vol. 14, Issue 3 (February 2021) , art. 536, ISSN 1996-1073

DOI: 10.3390/en14030536

25 p, 1.7 MB

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