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Fluid Properties Calculators

Use 34 fluid properties petroleum engineering calculators with formulas, inputs, outputs, units, and source references.

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

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Phase Behavior and ThermodynamicsFluid Properties

Absolute Viscosity for Saybolt Viscosimeter Measurements

μ=vρ\mu=v\rho
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Phase Behavior and ThermodynamicsFluid Properties

Absolute Viscosity for Ubbelohde Viscosimeter Measurements

μ=Cut\mu=C_ut
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Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Dead-Oil Gas-Oil Interfacial Tension

σod=σ68+(T−68)(σ100−σ68)100−68\sigma_{od}=\sigma_{68}+\frac{(T-68)(\sigma_{100}-\sigma_{68})}{100-68}
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Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Gas-Water Interfacial Tension at 280 F

σ280=53−0.1048P0.637\sigma_{280}=53-0.1048P^{0.637}
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Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Gas-Water Interfacial Tension at 74 F

σ74=75−1.108P0.349\sigma_{74}=75-1.108P^{0.349}
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Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Gas-Water Interfacial Tension by Temperature

σw=σ74+(T−74)(σ280−σ74)280−74\sigma_w=\sigma_{74}+\frac{(T-74)(\sigma_{280}-\sigma_{74})}{280-74}
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Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Live-Oil Gas-Oil Interfacial Tension

σo=σod(1−0.024P0.45)\sigma_o=\sigma_{od}\left(1-0.024P^{0.45}\right)
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Phase Behavior and ThermodynamicsFluid Properties

Beggs-Robinson Dead Oil Viscosity Correlation

μod=10x−1\mu_{od}=10^x-1
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Phase Behavior and ThermodynamicsFluid Properties

Beggs-Robinson Live Oil Viscosity Correlation

μo=AμodB\mu_o=A\mu_{od}^{B}
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Phase Behavior and ThermodynamicsFluid Properties

Egbogah Dead Oil Viscosity Below Bubble Point

μod=10101.8653−0.025086API−0.5644log⁡10T\mu_{od}=10^{10^{1.8653-0.025086API-0.5644\log_{10}T}}
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Phase Behavior and ThermodynamicsFluid Properties

Einstein Effective Viscosity for Dilute Suspensions

μeff=μ0(1+2.5ϕ)\mu_{eff}=\mu_0(1+2.5\phi)
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Phase Behavior and ThermodynamicsFluid Properties

Formation Water Density at Reservoir Conditions

ρwR=ρwSCBw\rho_{wR}=\frac{\rho_{wSC}}{B_w}
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Phase Behavior and ThermodynamicsFluid Properties

Formation Water Density at Standard Conditions

ρwSC=Cmg/L25000+62.428\rho_{wSC}=\frac{C_{mg/L}}{25000}+62.428
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Phase Behavior and ThermodynamicsFluid Properties

Formation Water Salinity from Density

Cmg/L=25000(SGw−1)62.428C_{mg/L}=25000(SG_w-1)62.428
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Phase Behavior and ThermodynamicsFluid Properties

Formation Water Specific Gravity from Density

SGw=ρw62.428SG_w=\frac{\rho_w}{62.428}
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Phase Behavior and ThermodynamicsFluid Properties

Kinematic Viscosity for Saybolt Viscosimeter Measurements

v=0.220to−180tov=0.220t_o-\frac{180}{t_o}
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Phase Behavior and ThermodynamicsFluid Properties

Kinematic Viscosity from Dynamic Viscosity and Density

ν=μρ\nu=\frac{\mu}{\rho}
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Phase Behavior and ThermodynamicsFluid Properties

Live Oil Density from Formation Volume Factor

ρo=ρo,st+0.0136RsγgBo\rho_o=\frac{\rho_{o,st}+0.0136R_s\gamma_g}{B_o}
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Phase Behavior and ThermodynamicsFluid Properties

Logarithmic Crude Oil Viscosity from API Gravity

log⁡μo=a−0.035API\log\mu_o=a-0.035API
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Phase Behavior and ThermodynamicsFluid Properties

McCain Brine Gas-Solubility Salinity Correction

Fs=10−0.0840655ST−0.285854F_s=10^{-0.0840655ST^{-0.285854}}
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Phase Behavior and ThermodynamicsFluid Properties

McCain Brine Solution Gas-Water Ratio

Rsw=RswpFsR_{sw}=R_{swp}F_s
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Phase Behavior and ThermodynamicsFluid Properties

McCain Pure-Water Solution Gas-Water Ratio

Rswp=A+BP+CP2R_{swp}=A+BP+CP^2
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Phase Behavior and ThermodynamicsFluid Properties

McCain Saturated Water Compressibility with Gas Liberation

cwsat=cwunder+BgBw(∂Rsw∂P)Tc_{wsat}=c_{wunder}+\frac{B_g}{B_w}\left(\frac{\partial R_{sw}}{\partial P}\right)_T
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Phase Behavior and ThermodynamicsFluid Properties

McCain Solution Gas-Water Pressure Derivative

(∂Rsw∂P)T=Fs(B+2CP)\left(\frac{\partial R_{sw}}{\partial P}\right)_T=F_s(B+2CP)
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Phase Behavior and ThermodynamicsFluid Properties

McCain Water Viscosity at Atmospheric Pressure

μw1=ATB\mu_{w1}=AT^B
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Phase Behavior and ThermodynamicsFluid Properties

McCain Water Viscosity at Reservoir Pressure

μw=μw1(0.9994+4.0295×10−5p+3.1062×10−9p2)\mu_w=\mu_{w1}\left(0.9994+4.0295\times10^{-5}p+3.1062\times10^{-9}p^2\right)
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Phase Behavior and ThermodynamicsFluid Properties

Newtonian Shear Stress from Viscosity

τ=μdudy\tau=\mu\frac{du}{dy}
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Phase Behavior and ThermodynamicsFluid Properties

Osif Water Isothermal Compressibility

cw=17.033P+0.5415Cmg/L−537T+403300c_w=\frac{1}{7.033P+0.5415C_{mg/L}-537T+403300}
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Phase Behavior and ThermodynamicsFluid Properties

Standard Discharge Time for Saybolt Viscosimeter Measurements

ts=to[1+0.000064(To−Ts)]t_s=t_o\left[1+0.000064(T_o-T_s)\right]
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Phase Behavior and ThermodynamicsFluid Properties

Standing Dead Oil Viscosity Correlation

μod=(0.32+1.8×107API4.53)(360t+200)a\mu_{od}=\left(0.32+\frac{1.8\times10^7}{API^{4.53}}\right)\left(\frac{360}{t+200}\right)^a
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Phase Behavior and ThermodynamicsFluid Properties

Standing Live Oil Density Correlation

ρo=62.4γo+0.0136Rsγg0.972+0.000147(Rsγg/γo+1.25t)1.175\rho_o=\frac{62.4\gamma_o+0.0136R_s\gamma_g}{0.972+0.000147\left(R_s\sqrt{\gamma_g/\gamma_o}+1.25t\right)^{1.175}}
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Phase Behavior and ThermodynamicsFluid Properties

Stock-Tank Oil Density from API Gravity

ρo,st=ρw141.5API+131.5\rho_{o,st}=\rho_w\frac{141.5}{API+131.5}
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Phase Behavior and ThermodynamicsFluid Properties

Vasquez-Beggs Oil Viscosity Above Bubble Point

μo=μob(ppb)m\mu_o=\mu_{ob}\left(\frac{p}{p_b}\right)^m
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Phase Behavior and ThermodynamicsFluid Properties

Viscosibility

cv=1μdμdPc_v = \frac{1}{\mu}\frac{d\mu}{dP}
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