Compressibility of the fluid with density
\rho and molar volume
V_m as a function of temperature
T and pressure
p:
(1) | c(T,p) = \frac{1}{\rho} \left( \frac{\partial \rho}{\partial p} \right)_T = - \frac{1}{V_m} \left( \frac{\partial V_m}{\partial p} \right)_T |
There is no universal full-range analytical model for Fluid Compressibility but there is a good number of approximations which can be effectively used in engineering practice.
Approximations
Incompressible fluid | Compressible fluid | ||||||||
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Slightly compressible fluid | Strongly Compressible Fluid | ||||||||
Real Gas | Ideal Gas | ||||||||
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| ... |
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| ... |
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| ... |
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where
A number of full-range mathematical models of Fluid Compressibility can be found in Fluid Compressibility @model.
The multi-phase fluid compressibility is a linear sum of compressibilities of its phases (see multi-phase fluid compressibility @ model).
Fluid Compressibility of popular petroleum fluids at SPE Standard Conditions (STP):
Fluid | Typical Range, GPa-1 |
---|---|
Natural Gas | 10,000 |
Gas Condensate | 100 |
Oil | 1 – 10 |
Water | 0.44 – 0.51 GPa-1 |
See also
Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Statics
[Compressibility] [ Z-factor ]
[Multi-phase compressibility @model] [ Fluid Compressibility @model ]
[ Incompressible fluid ] [ Slightly Compressible Fluid ] [ Strongly Compressible Fluid ] [ Ideal Gas ]