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.