Solution GOR -- Standing
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Rs = Gamma_g * (p/18/10**yg)**1.204
Rs = solution GOR, scf/STB, [20,1425]
p = pressure of interest, psia [130,7000]
y_g = mole fraction gas, =0.00091*Tr - 0.0125*Gamma_API,
Gamma_g = gas gravity (air=1.0), [0.59,0.95]
Tr = temperature of interest, F, [100,258] and
Gamma_API = stock-tank oil gravity, API [16.5,63.8].
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