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Main Logo
  • Home
  • Solutions
  • Contact Us
  • Resources
    • PVT Correlations
      • Oil Density
      • Bubble point pressure
      • Solution Gas Oil Ratio
      • Oil formation volume factor at bubblepoint
      • Total formation volume factor below bubblepoint
      • Undersaturated isothermal oil
      • Isobaric Instantaneous Thermal Expansion Coefficient
      • Isothermal oil compressibility below bubblepoint
      • Oil viscosity at bubblepoint pressure
      • Oil viscosity above bubblepoint pressure
      • Oil viscosity below bubblepoint
      • Dead oil viscosity
    • PVT Publications
    • PVT Presentations
  • January 17, 2024
  • by Restec

  1. Oil formation volume factor at bubblepoint pressure
  2. Oil formation volume factor at bubblepoint pressure is the volume at reservoir conditions occupied by one stock tank barrel of oil plus its solution gas. Three methods for estimating bubblepoint oil FVF are presented.

    1. Standing (1947)
    2. B ob = a 1 + a 2 [ R s ( γ g / γ o ) a 3 + a 4 T ] a 5 CoefficientOriginal a 1 0.9759 a 2 0.00012 a 3 0.5 a 4 1.25 a 5 1.2



    3. Vasquez & Beggs (1980)
    4. B ob =1+ a 1 R s + a 2 ( T−60 ) ( γ API / γ g )+ a 3 R s ( T−60 ) ( γ API / γ g ) CoefficientOriginal For γ API ≤30 : a 1 0.4677 x 10 −3 a 2 17.51 x 10 −6 a 3 −18.11 x 10 −9 For γ API >30 : a 1 0.467 x 10 −3 a 2 11.00 x 10 −6 a 3 1.337 x 10 −9



    5. Al-Marhoun (1992)
    6. B ob =1+ a 1   R s + a 2   R s ( γ g / γ o )  +  a 3   R s  ( T−60 ) ( 1− γ o )+  a 4 ( T−60 ) CoefficientOriginal a 1 0.177342 x 10 −3 a 2 0.220163 x 10 −3 a 3 4.292580 x 10 −6 a 4 0.528707 x 10 −3



      Above bubblepoint pressure, increased pressure will compress the liquid and reduce its volume.

      For the case of P > Pb, the oil FVF is calculated from

      B o = B ob e c ¯ o (P b −P)

      Correlation for calculating average oil compressibility Co at various conditions is presented later.

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