Gas/Oil Interfacial Tension
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Gas/Oil IFT (after Baker and Swerdloff).
Sigma_o = Fc * Sigma_T
Sigma_o = surface tension, dyne/cm
Fc = 1.0 - 0.025*P**0.45
p= pressure of interest,psia
Sigma_T = Sigma68 - (T-68)*(Sigma68 - Sigma100)/32,
Sigma68 = IFT at 68 F, = 39 - 0.2571*Gamma_API,
Sigma100 = IFT at 100 F, = 37.5 - 0.2571*Gamma_API,
Gamma_API = gravity of stock tank oil, API
T = temperature of interest, deg F
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