Bubble Point Pressure (Pb)

The bubble point pressure (Pb) of a hydrocarbon system is defined as the highest pressure at which a first bubble of gas is liberated from the oil.

The bubble point pressure is mainly a strong function of gas solubility (Rs), gas gravity (γg), oil gravity (API), and temperature (T).

Reference: Reservoir Engineering Handbook, Tarek Ahmed

Correlations

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

Input Parameters

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

scf/STB

Oil Gas Solubility (Rs)
Solution Gas Specifc Gravity (ɣg) Weighted average of the separated gas specific gravities from each separator
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SG

Solution Gas Specific Gravity (ɣg)
Temperature

°R

Stock Tank Oil Specific Gravity (ɣo) More Details

deg API

Saturated Oil Density (ρo,s)
Separator Pressure Actual separator pressure (first stage separator pressure at two stage separation)
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psi

Separator Temperature Actual separator temperature (first stage separator temperature at two stage separation)
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°R

First Stage Flash GOR GOR of 1st separator in two stage separation

scf/STB

CALCULATE

Results

CorrelationCalculated ValueWarningsRemarks
1-StandingpsiCalifornia crude oils and natural gases- Pb range is 130 to 7000 Psia
2-GlasopsiNorth Sea crude oil- Pb range is 1800 to 7130 Psia
3-MarhounpsiMiddle Eastern crude oil systems- Pb range is 130 to 3573 Psia
4-Petrosky and FarshadpsiGulf of Mexico crude oil system- Pb range is 1500 to 6500 Psia
5-Velarde et alpsiPb range is 70 to 6700 Psia
6-ValkopsiWorldwide- Pb range is 82 to 6700 Psia
7-Vasquez and BeggspsiPb range is 15 to 6055 Psia
8-Hanafy et alpsiEgyptian crude oils- Pb range is 36 to 5000 Psia