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PVT and Rock-Fluid Properties Calculators

Use 12 pvt and rock-fluid properties petroleum engineering calculators with formulas, inputs, outputs, units, and source references.

PVT and Rock-Fluid Properties calculators group related upstream petroleum engineering formulas by workflow so engineers can find the right calculation faster.

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Reservoir EngineeringPVT and Rock-Fluid Properties

API Gravity

API=141.5SGo−131.5API = \frac{141.5}{SG_o} - 131.5
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Reservoir EngineeringPVT and Rock-Fluid Properties

Capillary Number

Nc=μw⋅V⋅0.304886400⋅σowN_c = \frac{\mu_w \cdot V \cdot 0.3048}{86400 \cdot \sigma_{ow}}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Capillary Pressure

Pc=2⋅σ⋅cos⁡(θ)rP_c = \frac{2 \cdot \sigma \cdot \cos(\theta)}{r}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Characteristic Time for Linear Diffusion in Reservoirs

τ=Cu(Φ⋅βf+βr)⋅μ⋅l2k\tau = C_u \frac{(\Phi \cdot \beta_f + \beta_r) \cdot \mu \cdot l^2}{k}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Compressibility Drive in Gas Reservoirs

CI=G⋅EfBg⋅GpCI = \frac{G \cdot E_f}{B_g \cdot G_p}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Cumulative Effective Compressibility – Fetkovich

ce=Swi⋅cw+M⋅(cf+cw)+cf1−Swic_e = \frac{S_{wi} \cdot c_w + M \cdot (c_f + c_w) + c_f}{1 - S_{wi}}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Cumulative Oil Production – Undersaturated Oil Reservoirs

Np=N⋅ce⋅(BoiBo)⋅ΔPNp = N \cdot c_e \cdot \left( \frac{B_{oi}}{B_o} \right) \cdot \Delta P
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Reservoir EngineeringPVT and Rock-Fluid Properties

Effective Compressibility in Undersaturated Oil Reservoirs – Hawkins

ce=Soi⋅co+Swi⋅cw+cf1−Swic_e = \frac{S_{oi} \cdot c_o + S_{wi} \cdot c_w + c_f}{1 - S_{wi}}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Fraction of the Total Solution Gas Retained in the Reservoir as Free Gas

αg=1−(Np⋅RpN⋅Rsi−(N−Np)⋅Rs)\alpha_g = 1 - \left( \frac{N_p \cdot R_p}{N \cdot R_{si} - (N - N_p) \cdot R_s} \right)
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Reservoir EngineeringPVT and Rock-Fluid Properties

Free Gas in Place

Gf=7758⋅A⋅h⋅ϕ⋅(1−Swi)⋅EgiG_f = 7758 \cdot A \cdot h \cdot \phi \cdot (1 - S_{wi}) \cdot E_{gi}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Oil Saturation Below Bubble Point During Depletion

So=(1−Swi)(1−NpN)BoBoiS_o=(1-S_{wi})\left(1-\frac{N_p}{N}\right)\frac{B_o}{B_{oi}}
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Reservoir EngineeringPVT and Rock-Fluid Properties

Total Compressibility from Phase Saturations

ct=cgSg+coSo+cwSw+cfc_t=c_gS_g+c_oS_o+c_wS_w+c_f
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