DSC and rheometry investigations of crude oils

Thermal characteristics and rheological behaviour of eight crude oils cover ed a wide range of fluid composition and properties were studied by differe ntial scanning calorimeter (DSC) and viscometry. Wax appearance temperature s (WAT) of crude oils were determined by DSC and viscometry. Good agreement is obtained between the results. The dynamic viscosity in the Newtonian te mperature range of the crude oils (above 30 degrees C) generally obeyed a s imple first-order Arrhenius type of temperature dependence. Activation ener gies of flow in the non-Newtonian range are not uniquely defined.