Oil Formation Volume Factor

Definition - What does Oil Formation Volume Factor mean?

Oil Formation Volume Factor (FVF) is the volume of dissolved gas and crude oil at reservoir pressure and temperature divided by the volume of oil at standard conditions or stock tank surface conditions. It is denoted by the notation “Bo” and the purpose of calculating Oil Formation Volume Factor is to convert the flow rate of the oil stored in surface conditions or stock tanks to that of reservoir conditions.

Petropedia explains Oil Formation Volume Factor

Oil Formation Volume Factor is always greater than 1.0 bbl/STB and ranges from 1.0 bbl/STB to 3.0 bbl/STB. The reason of the Oil Formation Volume Factor being more than 1.0 bbl/STB is that the oil in hydrocarbon formations many a times contains dissolved natural gas and the gas comes out first from the wellbore when the hydrocarbon solution is brought to lower pressures at the surface of the earth.

FVF is equivalent to 3.0 bbl/STB and corresponds to highly volatile oils.

Oil Formation Volume Factor, Bo = Volume of oil at reservoir / Volume of oil at stock tanks or the surface

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