FVF stands for formation volume factor. It is the amount of oil at reservoir condition that can produce 1 unit volume of oil in stock tank or surface conditions. Mathematically,
FVF = Reservoir Volume of Oil / Stock Tank Volume of Oil.
In barrels, the unit is RB/STB ( Reservoir Barrels / Stock Tank Barrels)
It is often denoted by Bo.
Amount of Solution Gas, temperature, crude oil gravity, and gas gravity etc influence the value of FVF.
Amount of Solution Gas, temperature, crude oil gravity, and gas gravity etc influence the value of FVF.
As oil comes out from the underground reservoir to the surface, the dissolved gas comes out the overall oil volume shrinks. Therefore, the value of Bo is always more than 1. Typical values range from 1.1 to 2.0 RB/STB.
For a given temperature, above bubble point pressure (Pb), FVF remains nearly constant as the dissolves gas remains constant. A slight decrease at higher pressure is caused due to decrease in in-situ oil volume as a result of oil comprehensibility.
On the other hand, below bubble point pressure (Pb), FVF decrease with pressure, as more dissolved gas is already out of the system, there is lesser amount of shrinkage of oil moving out from the reservoir to the surface.
For a given temperature, above bubble point pressure (Pb), FVF remains nearly constant as the dissolves gas remains constant. A slight decrease at higher pressure is caused due to decrease in in-situ oil volume as a result of oil comprehensibility.
On the other hand, below bubble point pressure (Pb), FVF decrease with pressure, as more dissolved gas is already out of the system, there is lesser amount of shrinkage of oil moving out from the reservoir to the surface.
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