Annular Volume Calculator

Calculate annular volume between casing/tubing or drill pipe and open hole

Wellbore Sections

Define each section of the annulus from surface to bottom

1
Common Presets

Volume Results

Enter section dimensions and click Calculate

Common Applications

  • Cement volume calculations
  • Displacement volumes for cementing
  • Kill sheet calculations
  • Circulation time estimates
  • Spacer volume planning

Formula Reference

Annular Volume

Annular Volume (bbl) = (OD^2 - ID^2) / 1029.4 x Length Where: OD = Outer pipe ID or hole diameter (inches) ID = Inner pipe OD (inches) Length = Section length (feet) 1029.4 = Conversion constant for bbl/ft

Annular Capacity Factor

Capacity (bbl/ft) = (OD^2 - ID^2) / 1029.4 Capacity (gal/ft) = (OD^2 - ID^2) / 24.51 Capacity (ft3/ft) = (OD^2 - ID^2) / 183.35

Linear Displacement (ft/bbl)

ft/bbl = 1029.4 / (OD^2 - ID^2)

Alternative Formula (using areas)

V = PI/4 x (D_outer^2 - D_inner^2) x L Convert to bbl: V_bbl = V_in3 / 9702