Gas drive index in gas reservoirs
Input(s)
\(G\): Gas Initially in Place \((\mathrm{SCF})\)
\(G_{p}\): Cumulative Gas Production (SCF)
\(B_{g i}\): Initial Gas Formation Volume Factor \(\left(\mathrm{ft}^{3} / \mathrm{SCF}\right)\)
\(B_{g}\): Gas Formation Volume Factor \(\left(\mathrm{ft}^{3} / \mathrm{SCF}\right)\)
Output(s)
GDI: Gas (dimensionless)
Formula(s)
\[
G D I=\left(\frac{G}{G_{p}}\right) *\left(1-\frac{B_{g i}}{B_{g}}\right)
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3, Page: 211 .