A New Unified Model for Predicting non-Newtonian Viscosity of Waxy Crudes
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Taylor & Francis Production
Viscosity determination in the non-Newtonian regime has always been a major problem in the oil industry. This is due to its dependence on the wax precipitated shear and thermal history of the crude oil. The present shear rate dependent viscosity model was developed by applying the theory of suspension rheology. This model is characterized by its capacity to predict viscosities of crude oils with different shear and thermal history and those containing petroleum-based diluents. Once viscosities at two temperatures above the wax appearance temperature (WAT) and apparent viscosity in the non Newtonian regime are known, viscosities or apparent viscosities at any temperature above the gel point can be determined by using the model together with the concentration of precipitated wax at the specified temperature. Verification of the model by using two Nigerian crudes with different shear and thermal histories and two crudes obtained from the literature shows that the model predicts viscosities with an average absolute deviation of 4.9%.
aggregates, dispersed phase, gelation, suspension, Newtonian regimes
Adeyanju, O.A. and Oyekunle, L.O’: (2012).:”A New Unified Model for Predicting non-Newtonian Viscosity of Waxy Crudes” Petroleum Science and Technology, 30:9, 904-914. Publisher: Taylor & Francis Production.