Drilling ton miles - Round trip ton miles
Input(s)
\(\mathrm{W}_{\mathrm{p}}\): Buoyed Weight of Drill Pipe \((\mathrm{lb} / \mathrm{ft})\)
D: Depth of Hole (ft)
\(\mathrm{L}_{\mathrm{p}}\): Length of One Stand of Drill Pipe (ft)
\(\mathrm{W}_{\mathrm{b}}\): Weight of Travelling Block (lb)
Wdc: Weight of Drill Collar Per Feet (lb/ft)
Wdp: Drill Pipe Weight Per Feet (lb/ft)
L: Drill Collar Length \((\mathrm{ft})\)
BF: Buoyancy Factor (dimensionless)
Output(s)
\(\mathrm{W}_{\mathrm{c}}\): Buoyed Weight of Drill Collars-buoyed Weight of Drill Pipe (lb)
\(\mathrm{RT}_{\mathrm{TM}}\): Round Trip Ton Miles (ton miles)
Formula(s)
\[
\begin{gathered}
\mathrm{W}_{\mathrm{c}}=\mathrm{L} * \mathrm{BF} *(\mathrm{Wdc}-\mathrm{Wdp}) \\
\mathrm{RT}_{\mathrm{TM}}=\frac{\mathrm{W}_{\mathrm{p}} * \mathrm{D} *\left(\mathrm{~L}_{\mathrm{p}}+\mathrm{D}\right)+(2 * \mathrm{D}) *\left(2 * \mathrm{~W}_{\mathrm{b}}+\mathrm{W}_{\mathrm{c}}\right)}{5280 * 2000}
\end{gathered}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 44.