Drilling EngineeringWell Control
Closed-Ended Pipe Buoyed Weight with No Fluid Inside Formula
Closed-Ended Pipe Buoyed Weight with No Fluid Inside calculates buoyed weight of closed-ended pipe for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (W_air, OD, FW) 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_closed equals 16.126276 lb/ft.
W_airlb/ft
19.5
ODin
2.875
FWppg
10
Inputs
W_air
lb/ftPipe Weight in Air
OD
inPipe Outside Diameter
FW
ppgExternal Fluid Weight
Outputs
W_buoyed_closed
lb/ft
Buoyed Weight of Closed-Ended Pipe
W_air
lb/ft
Pipe Weight in Air
OD
in
Pipe Outside Diameter
FW
ppg
External Fluid Weight
Source and review
reviewedIADC WellSharp Formula Sheet, field units, well completion/workover formula sheet.
Source