Breakover Point Between Stripping and Snubbing Formula
Breakover Point Between Stripping and Snubbing calculates drill string length required to reach breakover for well control workflows in drilling engineering.
How engineers use this formula
Use this formula when the listed inputs (D_p, P_wb, W_dc, L_dc, BF, W_dp) 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, L_ds equals 3,767.520362 ft.
6.25
2400
83
276
0.8092
19.5
Inputs
D_p
inPipe or Drill Collar Outside Diameter
P_wb
psiWellbore Pressure
W_dc
lb/ftDrill Collar Weight
L_dc
ftDrill Collar Length
BF
dimensionlessBuoyancy Factor
W_dp
lb/ftDrill Pipe Weight
Outputs
L_ds
Drill String Length Required to Reach Breakover
F
Force Created by Wellbore Pressure
W
Buoyed Weight of Drill Collars
W_adp
Additional Weight Required from Drill Pipe
L_bp
Drill Pipe Length Required to Reach Breakover
Source and review
reviewedLapeyrouse, N.J. Formulas and Calculations for Drilling, Production and Workover, 2nd Edition, Page 139.
Source