Flow period duration (hydraulically fractured wells)
Input(s)
\(\emptyset\): Porosity (fraction)
\(c_{t}\): Total Compressibility \((1 / \mathrm{psi})\)
\(\mu\): Viscosity (cP)
\(L_{f}\): Fracture Length \((\mathrm{ft})\)
\(t_{L f D}\): Time of End of Linear or Start Pseudo Radial Flow from Plot (dimensionless)
k: Permeability \((\mathrm{mD})\)
Output(s)
t: Duration of Flow Periods (h)
Formula(s)
\[
t=\frac{\phi * \mu * c_{t} *\left(L_{f}^{2}\right) * t_{L f D}}{0.0002637 * k}
\]
Reference(s)
Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of Petroleum Engineers, Page: 115.