A new fractional model applied to description of the viscoelastic creep behavior of two Brazilian oils and their w/o emulsions

The objective of this work was to investigate and model the viscoelastic creep behavior of two Brazilian crude oils: A (API 16.8) and B (API 24.6), with different contents of aromatics, resins and asphaltenes and their W/O emulsions with water contents between 0 to 55%. Stable emulsions were prepared using an Ultra-Turrax homogenizer and the viscoelastic flow data were obtained from an Anton Paar controlled voltage Rheometer with plate-plate geometry. For modeling purposes, the fractional model was able to describe the experimental data very well obtaining a mean correlation coefficient (R2) equal to 0.9956 and root mean squared errors (RMSE) of the order of 10-13 for oil A and its emulsions and 10-12 for oil B and its emulsions.

Automated summary

The objective of this study was to investigate and model the viscoelastic creep behavior of two Brazilian crude oils and their emulsions. The fractional model was able to accurately describe the experimental data.