Tubing/Casing Capacity Calculator
Calculate pipe capacity and annular volume for wellbore calculations
Input Parameters
Enter pipe dimensions or select from common sizes
Common Applications
- Kill sheet preparation
- Displacement calculations
- Cementing volume estimation
- Kick volume calculations
- Spacer/pill volume planning
Results
Enter values and click Calculate to see results
Common Tubing Sizes
| Size (OD) | Weight (lb/ft) | ID (in) | Capacity (bbl/ft) |
|---|---|---|---|
| 2-3/8" | 4.70 | 1.995 | 0.00387 |
| 2-7/8" | 6.50 | 2.441 | 0.00579 |
| 3-1/2" | 9.30 | 2.992 | 0.00870 |
| 4" | 11.00 | 3.476 | 0.01174 |
| 4-1/2" | 12.75 | 3.958 | 0.01522 |
Formula Reference
Pipe Capacity Formula
Capacity (bbl/ft) = ID^2 / 1029.4
Where:
ID = Inner diameter in inches
1029.4 = Conversion constant
Alternative forms:
Capacity (gal/ft) = ID^2 / 24.51
Capacity (L/m) = ID^2 * 0.5067 (ID in inches)
Annular Capacity Formula
Annular Capacity (bbl/ft) = (OD^2 - ID^2) / 1029.4
Where:
OD = Outer diameter (hole or casing ID) in inches
ID = Inner pipe outer diameter in inches
Cross-sectional Area
Area (sq in) = PI * ID^2 / 4
For annulus:
Area (sq in) = PI * (OD^2 - ID^2) / 4
Common Conversion Factors
1 bbl = 42 US gallons
1 bbl = 5.615 cubic feet
1 bbl = 0.159 cubic meters
1 ft = 0.3048 meters