You must log in to edit PetroWiki. Help with editing

Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. SPE disclaims any and all liability for your use of such content. More information

Oil density

Jump to navigation Jump to search

The physical property density is the ratio between mass and volume.

The density of crude oil can be determined from :

  1. Specific gravity of the crude oil
  2. Solution gas gravity
  3. Solution gas-oil ratio
  4. Oil formation volume factor (FVF). [1]

Under any condition, density will be defined by


Stated more rigorously with PVT properties, this relationship becomes


This is valid for all pressure and temperature conditions for which the pressure-volume-temperature (PVT) properties are determined. As expressed, this equation provides density with the units of lbm/ft3.


Bo = oil FVF, bbl/STB
γo = oil specific gravity
γg = gas specific gravity, air=1
Rs = solution GOR, scf/STB
Vo = volume of crude oil, L3
Vg = volume of gas, L3
Wg = weight of dissolved gas, m
Wo = weight of crude oil, m


  1. Brill, J.P. and Beggs, H.D. 1984. Two-Phase Flow in Pipes, third edition. Tulsa, Oklahoma: University of Tulsa.

Noteworthy papers in OnePetro

Use this section to list papers in OnePetro that a reader who wants to learn more should definitely read

External links

Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro

See also

Produced water density

Oil formation volume factor

Gas formation volume factor and density