Volatilized oil gas Ratio (Rv) for oil material balance ecuations?

[Chichostyle]

Hello there, friend. I have a concern about your use of the Rv parameter in calculating material balance parameters for oil reservoirs. It's rare to see Rv included in a PVT report, probably because most are tailored to oil reservoirs. I'm skeptical that using Rv will yield accurate results, but perhaps you have insights that I'm unaware of. I would appreciate an explanation of why this approach was chosen.

im refering to this part
# calculate F, Bto, and Btg F = (Np * ((Bo - (Rs * Bg)) / (1 - (Rv * Rs)))) + ((Gp - Gi) * ((Bg - (Rv * Bo)) / (1 - (Rv * Rs)))) Btg = ((Bg * (1 - (Rs * Rvi))) + (Bo * (Rvi - Rv))) / (1 - (Rv * Rs)) # in RB/STB Bto = ((Bo * (1 - (Rv * Rsi))) + (Bg * (Rsi - Rs))) / (1 - (Rv * Rs)) # in RB/scf

this expression exactly (1 - (Rv * Rs)), i have never use it

While there are several modifications in methods like the Havlena and Odeh method or the straight line method,
like this (metrics units)

Straight line

Havlena an Odeh

using Rv in oil reservoir calculations is new to me, as it's typically associated with gas PVT data.

or maybe rv its not "Volatilized Oil-Gas Ratio" ?