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