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

Input(s)

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

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

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

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

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

Output(s)

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

Formula(s)

m=162.6QoμoBokhm=\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 .


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