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.