Solution GOR -- Vasquez & Beggs
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Rs = C1*Gamma_g*p**C2*exp(C3*Gamma_API/(T+460))
Rs = solution GOR, scf/STB, [20,2070]
p = pressure, psia [50,5250]
Gamma_g = gas gravity (air=1.0), [0.56,1.18]
Tr = reservoir temperature, F, [70,295] and
Gamma_API = stock-tank oil gravity, API [16,58].
C1, C2 and C3 are constants, depending on API.
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