Water two-phase formation volume factor

Input(s)

$B_{w}$: Water Formation Volume Factor (one phase) (rb/STB)

$B_{g}$: Gas Formation Volume Factor (MSCF/STB)

$R_{s}$: Gas Oil ratio (rb/MSCF)

$R_{i}$: Initial Gas Oil Ratio (rb/MSCF)

Output(s)

$B_{t}$: Water Formation Factor $(\mathrm{rb} / \mathrm{STB})$

Formula(s)

$$ B_{t}=B_{w}+B_{g} *\left(R_{s}-R_{i}\right) $$

Reference(s)

Ahmed, T., McKinney, P.D. Advanced reservoir Engineering, Gulf Publishing House, Burlington, MA, 2015.