Abstract
Measurements on acoustic velocities and densities of a set of super-criticalhydrocarbon fluids were taken at temperature up to 100 °C and pressure up to 70MPa. The results showed that the velocities and densities of these hydrocarbonfluids above bubble points depend almost linearly on temperature and pressure.Dissolved gases can greatly change these fluid properties. Isothermal compressionalwave velocity was introduced to correlate acoustic velocity data withPVT data through the heatcapacity ratio γ.No obvious effects of gas on the relation of the acousticand isothermal velocities was found, and the ratio γ forthe super-critical hydrocarbon systems studied ranged between 1.1 and 1.4.
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