A measure of relative fluid density
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c_f = \frac{1}{\rho_f} \frac{\partial \rho_f}{\partial p} |
This can be redefined in terms of fluid volume
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c_f = -\frac{1}{V_f} \frac{\partial V_f}{\partial p} |
| Symbol | Dimension | SI units | Oil metric units | Oil field units | ||||
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| M-1 L1 T2 | Pa-1 | kPa-1 | psi-1 |
The multi-phase compressibility is a simple sum of its components.