Saturated Oil Formation Volume Factor (Bo,s)

The oil formation volume factor (Bo) is defined as the ratio of the volume of oil (plus the gas in solution) at the prevailing reservoir temperature and pressure to the volume of oil at standard conditions.

Bo is always greater than or equal to unity. It should be noted that all the correlations could be used for any pressure equal to or below the bubble-point pressure.

Reference: Reservoir Engineering Handbook, Tarek Ahmed

Correlations

  • 1-Standing
  • 2-Glaso
  • 3-Marhoun
  • 4-Petrosky and Farshad
  • 5-Vasquez and Beggs
  • 6-Hanafy et al
  • 7-Material Balance

Input Parameters

NameInput Value - UnitConverted ValueValidityLink to Calculation Page
Solution Gas/Oil Ratio (Rs) Solution GOR at bubble point pressure (scf/STB)
More Details

943

SCF/STB

 Oil Gas Solubility (Rs)
Solution Gas Specific Gravity (ɣg) More Details

0.781

SG

 Solution Gas Specific Gravity (ɣg)
Temperature

677.67

°R

Stock Tank Oil Specific Gravity (ɣo)

44.2

deg API

Separator Pressure Actual separator pressure (two stage separation)
More Details

200

psi

Separator Temperature Actual separator temperature (two stage separation)
More Details

519.67

°R

First Stage Flash GOR

500

SCF/STB

Oil Density @ (P,T) Density of oil at the specified pressure and temperature
More Details

45.171

deg API

Saturated Oil Density (ρo,s)- Saturated Oil Density (ρo,s)

CALCULATE

Results

CorrelationCalculated ValueWarningsRemarks
1-Standing1.5709bbl/STBCalifornia crude oils and natural gases- Bo range is 1.024 to 2.15 bbl/STB
2-Glaso1.5415bbl/STBNorth Sea crude oil- Bo range is 1.032 to 2.588 bbl/STB
3-Marhoun1.5541bbl/STBMiddle Eastern crude oil systems- Bo range is 1.032 to 1.997 bbl/STB
4-Petrosky and Farshad1.5835bbl/STBGulf of Mexico crude oil system- Bo range is 1.1178 to 1.6229 bbl/STB
5-Vasquez and Beggs1.5458bbl/STBBo range is 1.022 to 2.747 bbl/STB
6-Hanafy et al1.4927bbl/STBEgyptian crude oils- Bo range is 1.032 to 4.35 bbl/STB
7-Material Balance1.3343bbl/STB