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Reserves and Recovery Calculators

Use 13 reserves and recovery petroleum engineering calculators with formulas, inputs, outputs, units, and source references.

Reserves and Recovery calculators 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

Np(t)=qiDi(1−e−Dit)N_p(t)=\frac{q_i}{D_i}\left(1-e^{-D_i t}\right)
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Reservoir EngineeringReserves and Recovery

Arps Exponential Decline Rate

q(t)=qie−Ditq(t)=q_i e^{-D_i t}
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Reservoir EngineeringReserves and Recovery

Arps Harmonic Decline Cumulative Production

Np(t)=qiDiln⁡(1+Dit)N_p(t)=\frac{q_i}{D_i}\ln(1+D_it)
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Reservoir EngineeringReserves and Recovery

Arps Harmonic Decline Rate

q(t)=qi1+Ditq(t)=\frac{q_i}{1+D_it}
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Reservoir EngineeringReserves and Recovery

Arps Hyperbolic Decline Cumulative Production

Np(t)=qi(1−b)Di[1−(1+bDit)1−1/b]N_p(t)=\frac{q_i}{(1-b)D_i}\left[1-(1+bD_it)^{1-1/b}\right]
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Reservoir EngineeringReserves and Recovery

Arps Hyperbolic Decline Rate

q(t)=qi(1+bDit)1/bq(t)=\frac{q_i}{(1+bD_it)^{1/b}}
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Reservoir EngineeringReserves and Recovery

Condensate Production Rate from Gas Rate and Yield

qc=qgYc1000q_c=\frac{q_gY_c}{1000}
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Reservoir EngineeringReserves and Recovery

Exponential Decline Time to Economic Limit

tecon=1Diln⁡(qiqecon)t_{econ}=\frac{1}{D_i}\ln\left(\frac{q_i}{q_{econ}}\right)
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Reservoir EngineeringReserves and Recovery

Gas-Condensate Liquid Content from Producing GOR

Yc=106GORpY_c=\frac{10^6}{GOR_p}
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Reservoir EngineeringReserves and Recovery

NGL Production Rate from Gas Rate and Yield

qNGL=qgYNGL1000q_{NGL}=\frac{q_gY_{NGL}}{1000}
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Reservoir EngineeringReserves and Recovery

Oil Lost During Gas-Cap Migration

O=7758AhϕSorgBoaO=7758Ah\phi\frac{S_{org}}{B_{oa}}
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Reservoir EngineeringReserves and Recovery

Oil Recovery Factor from Cumulative Production

RF=NpNRF = \frac{N_p}{N}
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Reservoir EngineeringReserves and Recovery

Recoverable Condensate from Cumulative Gas and Yield

Nc=GpYcN_c=G_pY_c
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