... approach the PVT correlations are applied to predict the crude oil properties. Fundamentally, there are two approaches for crude oil viscosity predictions. The first approach uses oilfield data, such as reservoir temperature, produced oil API gravity, solution gas-oil ratio, to predict the oil viscosity...

..., and core analysis results are collected, showing that in-situ viscosity predictions are possible in the laboratory. NMR spectra measured in the laboratory are compared to NMR logging tool spectra, in order to determine if results obtained using bench top instruments can be extrapolated to logging tool data...

.... This paper presents tuning procedures to improve the model results for different viscosity ranges, and extends the NMR model viscosity predictions to in situ heavy oil in unconsolidated sands. The results of this work show that the NMR oil peak can be de-convoluted from the in situ signals of the oil...