| (1) | B_g(p,T) = \frac{\rho_g^{\circ}}{\rho_g} = \frac{V_g}{V_g^{\circ}} |
where
\rho_g^{\circ} | fluid density at surface conditions | V_m^{\circ} | molar volume at surface conditions |
\rho_g | fluid density at reservoir conditions | V_m | molar volume at reservoir conditions |
It can be expressed through the Z-factor as:
| (2) | B_g(p,T) = Z(p, T) \cdot \frac{T}{p} \cdot \frac{p_{\rm ref}}{T_{\rm ref}} |
where
p_{\rm ref} | reference pressure |
T_{\rm ref} | reference temperature |
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Fluid (PVT) Analysis / Dynamic fluid properties