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.