Bottomhole assembly length required for a desired weight on bit
Input(s)
\(\mathrm{W}_{\mathrm{b}}\): Desired Weight to be used while Drilling (lb)
f: Safety Factor (fraction)
\(\mathrm{W}_{\mathrm{d}}\): Drill Collar Weight \((\mathrm{lb} / \mathrm{ft})\)
BF: Buoyancy Factor (unitless)
Output(s)
L: Length of Bottomhole Assembly (ft)
Formula(s)
\[
\mathrm{L}=\frac{\mathrm{W}_{\mathrm{b}} * \mathrm{f}}{\mathrm{W}_{\mathrm{d}} * \mathrm{BF}}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 42.