Maximum length of drillpipe for a specific bottomhole assembly
Input(s)
T: Tensile Strength of Pipe (lb)
f: Safety Factor (unitless)
MOP: Margin of Overpull (unitless)
\(\mathrm{W}_{\mathrm{b}}\): Weight of Bha in Air \((\mathrm{lb} / \mathrm{ft})\)
\(\mathrm{W}_{\mathrm{d}}\): Weight of Drill Pipe in Air (lb/ft)
BF: Buoyancy Factor (unitless)
Output(s)
\(\mathrm{L}_{\mathrm{m}}\): Maximum Length \((\mathrm{ft})\)
Formula(s)
\[
\mathrm{L}_{\mathrm{m}}=\frac{\left((\mathrm{T} * \mathrm{f})-\mathrm{MOP}-\mathrm{W}_{\mathrm{b}}\right) * \mathrm{BF}}{\mathrm{W}_{\mathrm{d}}}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 43.