Time to reach the semi-steady state for a gas well in a circular or square drainage area (2)
Input(s)
\(\mu_{g i}\): Initial Gas Viscosity \((\mathrm{cP})\)
\(\emptyset\): Porosity (fraction)
A: Drainage Area \(\left(\mathrm{ft}^{2}\right)\)
\(\mathrm{k}\): Effective Gas Permeability \((\mathrm{mD})\)
\(c_{t i}\): Initial Total Compressibility \((1 / \mathrm{psi})\)
Output(s)
\(t_{p s s}\): Time (h)
Formula(s)
\[
t_{p s s}=\frac{15.8 \phi * \mu_{g i} * c_{t i} * A}{k}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3, Page: 194.