A Nonlinear Viscoelastic Model for the Yielding of Gelled Waxy Crude Oil

Mengran Sun, David Jou and Zhihui Wang
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Mengran Sun: National Engineering Laboratory for Pipeline Safety, Beijing 102249, China
David Jou: Department of Physics, Autonomous University of Barcelona, 08193 Barcelona, Spain
Zhihui Wang: Science and Technology Information Department, China Huanqiu Contracting and Engineering Co., Ltd., Beijing 100081, China

Energies, 2021, vol. 14, issue 3, 1-25

Abstract: 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.

Keywords: nonlinear viscoelasticity; rheological model; waxy crude oil; yielding; fractal gels (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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