Comparison of correlations based on API gravity for predicting viscosity of crude oils

Comparison of Empirical Models to Predict Viscosity of Secondary Vacuum Gas Oils

“…In other words, the best prediction ability of the viscosity of the secondary VGOs from Table 1 exhibited the empirical model of Aboul-Seoud and Moharam [15]. One can see from the data in Table 5 that the empirical models of Sanchez-Minero et al [17], and Fang and Lei [14] were found not applicable for the secondary VGO viscosity prediction.…”

“…The empirical models are typically simpler and only require a few basic parameters such as mid-boiling point temperature and specific gravity of the oil, or alternatively a single viscosity measurement, in order to extrapolate the viscosity to a different temperature [20]. The input oil characterization data for the empirical methods predicting viscosity include density, average boiling point or T 50% or molecular weight [4,5,10,11,[13][14][15][16][17][18][20][21][22]. Al-Maamari et al [16] and Bahadori [18] introduced the correlating parameter, that is (Sa/(Ar + Re + As)) ratio (where Sa, Ar, Re, and As are the contents of saturates, aromatics, resins, and asphaltenes, respectively); multiplied by the API to account for the effect of oil composition on viscosity.…”

“…Al-Maamari et al [16] and Bahadori [18] introduced the correlating parameter, that is (Sa/(Ar + Re + As)) ratio (where Sa, Ar, Re, and As are the contents of saturates, aromatics, resins, and asphaltenes, respectively); multiplied by the API to account for the effect of oil composition on viscosity. Sánchez-Minero et al [17] account the effect of petroleum composition on its viscosity by the use of only API. As a whole, the higher the molecular weight (average boiling point or T 50% ) and the higher the density of the oil the higher the viscosity is.…”

“…The empirical models of Abbott [4], Twu [5], and Fang [14], which exhibited a satisfactory prediction of primary VGO viscosity were verified for their prediction ability for these 24 secondary VGOs. The models of Aboul-Seoud and Moharam [15], Sánchez-Minero et al [17], AlMulla and Albahri [20], and Kotzakoulakis and George [21] were also examined for their capability to correctly predict the viscosity of the 24 secondary VGOs. Analyzing the results of the comparison between measured and predicted viscosity by the seven tested models, a modification of the best model was proposed and a verification with another set of 10 secondary VGOs for the new model and the best published model was performed.…”

A numerical study on water wetting associated with the internal corrosion of oil pipelines

“…At a certain temperature, heaver oils are more viscous. (Sanchez-Minero et al, 2014). Hence, they are capable of sweeping more water from the bottom of pipe.…”