PO.PVT.Co.UnSat.ByVasquezBeggs(Rsb, SG_gas, API, T_degF, P)

Calculates oil compressibility using Vasquez and Beggs (1980) correlation, P > Pb, [1/psi].

PO.PVT.Co.Sat.ByVillenaLanzi(P, Pb, T_degF, Rsb, API)

Calculates oil compressibility using Villena-Lanzi (1985) correlation, P <= Pb, [1/psi].

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