Shape factor - Earlougher

Input(s)

m: Slope of Transient Semi-log Straight Line (psi/log cycle)

$\mathrm{m}$ : Slope of Semi-steady State Cartesian Straight Line (psi/h)

$\mathrm{P}_{1 \mathrm{hr}}$ : Pressure at $t=1 \mathrm{~h}$ from Transient Semi-log Straight Line (psi)

$P_{f}$ : Pressure at $t=0$ from Pseudo-steady State Cartesian Straight Line (psi)

$\mathrm{C}_{\mathrm{A}}$ : Shape Factor (dimensionless)

\mathrm{C}_{\mathrm{A}}=5.456 *\left(\frac{\mathrm{m}}{\mathrm{m}^{\prime}}\right) * \exp \left(2.303 * \frac{\mathrm{P}_{1 \mathrm{hr}}-P \int}{\mathrm{m}^{\prime}}\right)

Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 47.