Stripping/snubbing calculations - Breakover point between stripping and snubbing
Input(s)
: Pipe or collar OD (in.)
P: Wellbore Pressure (psi)
: Weight of Drill Collar (lb/ft)
L: Drill Collar Length (ft)
BF: Buoyancy Factor (dimensionless)
: Drill Pipe Weight
Output(s)
F: Force created by wellbore pressure on Drill collar or pipe (lb)
W: Weight of Drill Collar (lb)
: Additional weight required from Drill Pipe (lb)
: Length of Drill Pipe required to reach over breakover point (ft)
: Length of Drill string req to reach breakover point (ft)
Formula(s)
Reference(s)
Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 139.