Shut-in time for pressure build-up test (Dietz method)
Input(s)
\(\emptyset\): Porosity (fraction)
A: Drainage Area \(\left(\mathrm{ft}^{2}\right)\)
\(C_{A}\): Shape Factor (dimensionless)
\(\mu\): Viscosity \((\mathrm{cP})\)
\(c_{t}\): Total Compressibility \((1 / \mathrm{psi})\)
k: Permeability \((\mathrm{mD})\)
Output(s)
\(t_{s}\): Shut-in Time (h)
Formula(s)
\[
t_{s}=\frac{\phi * \mu * c_{t} * A}{0.0002637 * C_{A} * k}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 63.