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)

Output(s)

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

Formula(s)

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

Reference(s)

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