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Reserves and Recovery Equations

Browse 13 reserves and recovery petroleum engineering equations with formulas, inputs, outputs, units, and sources.

Reserves and Recovery equations group related upstream petroleum engineering formulas by workflow so engineers can find the right calculation faster.

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Reservoir EngineeringReserves and Recovery

Arps Exponential Decline Cumulative Production

N_p(t)=\frac{q_i}{D_i}\left(1-e^{-D_i t}\right)

Reservoir EngineeringReserves and Recovery

Arps Exponential Decline Rate

q(t)=q_i e^{-D_i t}

Reservoir EngineeringReserves and Recovery

Arps Harmonic Decline Cumulative Production

N_p(t)=\frac{q_i}{D_i}\ln(1+D_it)

Reservoir EngineeringReserves and Recovery

Arps Harmonic Decline Rate

q(t)=\frac{q_i}{1+D_it}

Reservoir EngineeringReserves and Recovery

Arps Hyperbolic Decline Cumulative Production

N_p(t)=\frac{q_i}{(1-b)D_i}\left[1-(1+bD_it)^{1-1/b}\right]

Reservoir EngineeringReserves and Recovery

Arps Hyperbolic Decline Rate

q(t)=\frac{q_i}{(1+bD_it)^{1/b}}

Reservoir EngineeringReserves and Recovery

Condensate Production Rate from Gas Rate and Yield

q_c=\frac{q_gY_c}{1000}

Reservoir EngineeringReserves and Recovery

Exponential Decline Time to Economic Limit

t_{econ}=\frac{1}{D_i}\ln\left(\frac{q_i}{q_{econ}}\right)

Reservoir EngineeringReserves and Recovery

Gas-Condensate Liquid Content from Producing GOR

Y_c=\frac{10^6}{GOR_p}

Reservoir EngineeringReserves and Recovery

NGL Production Rate from Gas Rate and Yield

q_{NGL}=\frac{q_gY_{NGL}}{1000}

Reservoir EngineeringReserves and Recovery

Oil Lost During Gas-Cap Migration

O=7758Ah\phi\frac{S_{org}}{B_{oa}}

Reservoir EngineeringReserves and Recovery

Oil Recovery Factor from Cumulative Production

RF = \frac{N_p}{N}

Reservoir EngineeringReserves and Recovery

Recoverable Condensate from Cumulative Gas and Yield

N_c=G_pY_c