Miscibility at elevated pressures

Physicsil Chemial Properties of Reservoir Systems at Elevated Pressures 

The physical properties that affect the high-pressure processes are changed due to two reasons (i) mechanical effect of high pressure, and (ii) increased mutual solubilities of the two adjacent phases at high pressure. The physical properties (such as density, viscosity, and interfacial tension) have an impact on the multiphase flow, phase separation, and process efficiency. Diffusivity and wetting characteristics are related to the properties mentioned, and thus also subject to alterations. Equipment available for experimental determination of physicochemical quantities at elevated pressures are also described in Chapter 14. 

The densities of the adjacent fluid phases at elevated pressures may vary considerably compared to atmospheric conditions due to the mechanical compressibility and 

PVT Absolute volume Crude oil Experimental error considerable 

Vibrating tube Resonance frequency Oil with dissolved gas Calibration required 

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