Maximum weight on bit
Input(s)
\(\mathrm{L}_{\mathrm{d}}\): Length of Drill Collar \((\mathrm{ft})\)
\(\mathrm{W}_{\mathrm{d}}\): Unit Wight of Collar \((\mathrm{lbf} / \mathrm{ft})\)
SF: Safety Factor (dimensionless)
BF: Buoyancy Factor (dimensionless)
\(\alpha\): Wellbore Inclination (degree)
Output(s)
WOB: Maximum Weight on Bit (lbf)
Formula(s)
\[
\mathrm{WOB}=\frac{\mathrm{L}_{\mathrm{d}} * \mathrm{~W}_{\mathrm{d}} * \mathrm{BF} * \cos (\alpha)}{\mathrm{SF}}
\]
Reference(s)
Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 380.