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Fluid Properties Equations

Browse 34 fluid properties petroleum engineering equations with formulas, inputs, outputs, units, and sources.

Fluid Properties equations 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

\mu=v\rho

Phase Behavior and ThermodynamicsFluid Properties

Absolute Viscosity for Ubbelohde Viscosimeter Measurements

\mu=C_ut

Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Dead-Oil Gas-Oil Interfacial Tension

\sigma_{od}=\sigma_{68}+\frac{(T-68)(\sigma_{100}-\sigma_{68})}{100-68}

Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Gas-Water Interfacial Tension at 280 F

\sigma_{280}=53-0.1048P^{0.637}

Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Gas-Water Interfacial Tension at 74 F

\sigma_{74}=75-1.108P^{0.349}

Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Gas-Water Interfacial Tension by Temperature

\sigma_w=\sigma_{74}+\frac{(T-74)(\sigma_{280}-\sigma_{74})}{280-74}

Phase Behavior and ThermodynamicsFluid Properties

Baker-Swerdloff Live-Oil Gas-Oil Interfacial Tension

\sigma_o=\sigma_{od}\left(1-0.024P^{0.45}\right)

Phase Behavior and ThermodynamicsFluid Properties

Beggs-Robinson Dead Oil Viscosity Correlation

\mu_{od}=10^x-1

Phase Behavior and ThermodynamicsFluid Properties

Beggs-Robinson Live Oil Viscosity Correlation

\mu_o=A\mu_{od}^{B}

Phase Behavior and ThermodynamicsFluid Properties

Egbogah Dead Oil Viscosity Below Bubble Point

\mu_{od}=10^{10^{1.8653-0.025086API-0.5644\log_{10}T}}

Phase Behavior and ThermodynamicsFluid Properties

Einstein Effective Viscosity for Dilute Suspensions

\mu_{eff}=\mu_0(1+2.5\phi)

Phase Behavior and ThermodynamicsFluid Properties

Formation Water Density at Reservoir Conditions

\rho_{wR}=\frac{\rho_{wSC}}{B_w}

Phase Behavior and ThermodynamicsFluid Properties

Formation Water Density at Standard Conditions

\rho_{wSC}=\frac{C_{mg/L}}{25000}+62.428

Phase Behavior and ThermodynamicsFluid Properties

Formation Water Salinity from Density

C_{mg/L}=25000(SG_w-1)62.428

Phase Behavior and ThermodynamicsFluid Properties

Formation Water Specific Gravity from Density

SG_w=\frac{\rho_w}{62.428}

Phase Behavior and ThermodynamicsFluid Properties

Kinematic Viscosity for Saybolt Viscosimeter Measurements

v=0.220t_o-\frac{180}{t_o}

Phase Behavior and ThermodynamicsFluid Properties

Kinematic Viscosity from Dynamic Viscosity and Density

\nu=\frac{\mu}{\rho}

Phase Behavior and ThermodynamicsFluid Properties

Live Oil Density from Formation Volume Factor

\rho_o=\frac{\rho_{o,st}+0.0136R_s\gamma_g}{B_o}

Phase Behavior and ThermodynamicsFluid Properties

Logarithmic Crude Oil Viscosity from API Gravity

\log\mu_o=a-0.035API

Phase Behavior and ThermodynamicsFluid Properties

McCain Brine Gas-Solubility Salinity Correction

F_s=10^{-0.0840655ST^{-0.285854}}

Phase Behavior and ThermodynamicsFluid Properties

McCain Brine Solution Gas-Water Ratio

R_{sw}=R_{swp}F_s

Phase Behavior and ThermodynamicsFluid Properties

McCain Pure-Water Solution Gas-Water Ratio

R_{swp}=A+BP+CP^2

Phase Behavior and ThermodynamicsFluid Properties

McCain Saturated Water Compressibility with Gas Liberation

c_{wsat}=c_{wunder}+\frac{B_g}{B_w}\left(\frac{\partial R_{sw}}{\partial P}\right)_T

Phase Behavior and ThermodynamicsFluid Properties

McCain Solution Gas-Water Pressure Derivative

\left(\frac{\partial R_{sw}}{\partial P}\right)_T=F_s(B+2CP)

Phase Behavior and ThermodynamicsFluid Properties

McCain Water Viscosity at Atmospheric Pressure

\mu_{w1}=AT^B

Phase Behavior and ThermodynamicsFluid Properties

McCain Water Viscosity at Reservoir Pressure

\mu_w=\mu_{w1}\left(0.9994+4.0295\times10^{-5}p+3.1062\times10^{-9}p^2\right)

Phase Behavior and ThermodynamicsFluid Properties

Newtonian Shear Stress from Viscosity

\tau=\mu\frac{du}{dy}

Phase Behavior and ThermodynamicsFluid Properties

Osif Water Isothermal Compressibility

c_w=\frac{1}{7.033P+0.5415C_{mg/L}-537T+403300}

Phase Behavior and ThermodynamicsFluid Properties

Standard Discharge Time for Saybolt Viscosimeter Measurements

t_s=t_o\left[1+0.000064(T_o-T_s)\right]

Phase Behavior and ThermodynamicsFluid Properties

Standing Dead Oil Viscosity Correlation

\mu_{od}=\left(0.32+\frac{1.8\times10^7}{API^{4.53}}\right)\left(\frac{360}{t+200}\right)^a

Phase Behavior and ThermodynamicsFluid Properties

Standing Live Oil Density Correlation

\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}}

Phase Behavior and ThermodynamicsFluid Properties

Stock-Tank Oil Density from API Gravity

\rho_{o,st}=\rho_w\frac{141.5}{API+131.5}

Phase Behavior and ThermodynamicsFluid Properties

Vasquez-Beggs Oil Viscosity Above Bubble Point

\mu_o=\mu_{ob}\left(\frac{p}{p_b}\right)^m

Phase Behavior and ThermodynamicsFluid Properties

Viscosibility

c_v = \frac{1}{\mu}\frac{d\mu}{dP}