Crude Oil – mineral oil composed by a mixture of hydrocarbons of natural origin, with variable density and viscosity.
Heavy Crude Oil – type of crude oil that exists in zones such as the Orinoco (Venezuela), the banks of Athabasca (Alberta/Canada) and the banks of Olenik (Siberia/Russia).
They have the following characteristics:
- Density close to or even higher than the water
- High viscosity, can be almost solid at environment temperature
- Can not be produced, carried and refined by the conventional methods
- Generally they have high content of sulphur and some metals such as the nickel and the vanadium
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