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 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 Specifc Gravity (ɣg) Weighted average of the separated gas specific gravities from each separator
More Details

0.781

SG

 Solution Gas Specific Gravity (ɣg)
Temperature

677.67

°R

Stock Tank Oil Specific Gravity (ɣo) More Details

44.2

deg API

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

200

psi

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

519.67

°R

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

500

SCF/STB

CALCULATE

Results

CorrelationCalculated ValueWarningsRemarks
1-Standing2884.54psiCalifornia crude oils and natural gases- Pb range is 130 to 7000 Psia
2-Glaso3027.32psiNorth Sea crude oil- Pb range is 1800 to 7130 Psia
3-Marhoun3307.08psiMiddle Eastern crude oil systems- Pb range is 130 to 3573 Psia
4-Petrosky and Farshad3287.05psiGulf of Mexico crude oil system- Pb range is 1500 to 6500 Psia
5-Velarde et al2927.04psiPb range is 70 to 6700 Psia
6-Valko2912.79psiWorldwide- Pb range is 82 to 6700 Psia
7-Vasquez and Beggs3059.84psiPb range is 15 to 6055 Psia
8-Hanafy et al2367.1psiEgyptian crude oils- Pb range is 36 to 5000 Psia