Nonisothermal models to determine the rheological constants of different Kuwaiti crude oils

Abstract EN

The rheological characteristics of four Kuwaiti crude oil samples collected from four different collection points, namely, MG 23T, MG 29T, MG 34T, and MG 108T, were investigated.

The investigations were conducted in the temperature range of 298-313 K using the Bingham, Ostwald-de Waele, Herschel-Bulkley, Casson, and modified Casson models.

The experimental data of the shear stress were modeled as a function of the shear rate and temperature.

Statistical estimations were used to determine the most accurate model and nonisothermal empirical relations.

The Ostwald-de Waele and Herschel-Bulkley models yielded the most accurate predictions for MG 23T, MG 29T, MG 108T, and MG 34T, respectively.

It is noted that all the crude oils follow shear thinning behavior.

Arrhenius-Eyring equation has been used to estimate the activation energy and the preexponential factor of these crude oils at a shear rate of 10.3 s¹.