Total compressibility

Input(s)

$c_{g}$: Compressibility of gas (1/psi)

$c_{o}$: Compressibility of oil (1/psi)

$c_{w}$: Compressibility of water (1/psi)

$c_{f}$: Compressibility of formation (1/psi)

$S_{g}$: Saturation of gas (fraction)

$S_{o}$: Saturation of oil (fraction)

$S_{w}$: Saturation of water (fraction)

Output(s)

$c_{t}$: Total Compressibility (1/psi)

Formula(s)

$$ c_{t}=c_{g} * S_{g}+c_{o} * S_{o}+c_{w} * S_{w}+c_{f} $$

Reference(s)

Petrowiki.org.