Dimensionless buildup pressure for field calculations

Input(s)

$P_{i}$: Initial Reservoir Pressure (psi)

$P_{w s}$: Shut in Pressure (psi)

$m$: Slope of Semi-Log Graph $\left(\mathrm{kg} / \mathrm{cm}^{2}\right) / \log$ cycle for Liquid

Output(s)

$P_{D s}$: Dimensionless Pressure (dimensionless)

Formula(s)

$$ P_{D s}=\frac{\left(P_{i}-P_{w s}\right)}{0.87 m} $$

Reference(s)

Ramey Jr, H. J. (1981). Reservoir Engineering Assessment of Geothermal Systems. Department of Petroleum Engineering, Stanford University, Page: (5.8).