Slope of Semilog plot for bottom-hole flowing pressure vs time for drawdown test

Input(s)

$Q_{o}$: Oil Flow Rate (STB/day)

$\mu_{o}$: Oil Viscosity $(\mathrm{cP})$

$B_{o}$: Oil Formation Volume Factor (bbl/STB)

$\mathrm{k}$: Permeability $(\mathrm{mD})$

$\mathrm{h}$: Thickness $(\mathrm{ft})$

Output(s)

$\mathrm{m}$: Slope (psi/cycle)

Formula(s)

$$ m=\frac{162.6 * Q_{o} * \mu_{o} * B_{o}}{k * h} $$

Reference(s)

Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 45 .