Tubular Buoyed Weight with Different Internal and Annular Fluids Formula
Tubular Buoyed Weight with Different Internal and Annular Fluids calculates buoyed weight with different internal and annular fluids for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (W_air, ID, FW_tbg, OD, FW_ann) are known and the assumptions behind the cited well control relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, W_buoyed_diff equals 18.217824 lb/ft.
19.5
2.441
8.6
2.875
10
Inputs
W_air
lb/ftPipe Weight in Air
ID
inPipe Inside Diameter
FW_tbg
ppgFluid Weight Inside Tubing
OD
inPipe Outside Diameter
FW_ann
ppgAnnulus Fluid Weight
Outputs
W_buoyed_diff
Buoyed Weight with Different Internal and Annular Fluids
W_air
Pipe Weight in Air
ID
Pipe Inside Diameter
FW_tbg
Fluid Weight Inside Tubing
OD
Pipe Outside Diameter
FW_ann
Annulus Fluid Weight
Source and review
reviewedIADC WellSharp Formula Sheet, field units, well completion/workover formula sheet.
Source