An improved temperature-viscosity correlation for crude oil systems

Egbogah, E.O. and Ng, J.T., 1990. An improved temperature viscosity correlation for crude oil systems. J. Pet. Sci. Erg., 4: 197-200. In the application of Beggs and Robinson dead-oil viscosity temperature empirical correlation to several hundred dead-oil systems, we have found a consistently significant deviation between measured and calculated viscosity values. This paper presents a modified Beggs and Robinson empirical viscosity correlation. The proposed new correlation has be en verified using a data base of about four hundred oil analysis reports (oil systems), and it shows a significantly better correlation, with a standard deviation and average error of at least 12% and 55%, respectively, better than the existing correlation of Beggs and Robinson. We have also expanded the applicability of this correlation further by the inclusion of pour point temperature in the empirical equations. The new correlation also appears to apply to a wide range of oil specific gravities and pour point temperatures.