Depth of a washout - Method 2
Input(s)
\(\mathrm{N}_{\mathrm{s}}\): Number of Strokes Required (unitless)
\(\mathrm{P}_{\mathrm{o}}\): Pump Output per Stroke (bbl/stroke)
\(\mathrm{C}_{\mathrm{p}}\): Drillpipe Capacity \((\mathrm{bbl} / \mathrm{ft})\)
\(\mathrm{C}_{\mathrm{a}}\): Annular Capacity (bbl/ft)
Output(s)
\(D_{w}\): Depth of Washout ( \(f t\) )
Formula(s)
\[
\mathrm{D}_{\mathrm{w}}=\mathrm{N}_{\mathrm{s}} * \frac{\mathrm{P}_{\mathrm{o}}}{\mathrm{C}_{\mathrm{p}}+\mathrm{C}_{\mathrm{a}}}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition Gulf Professional, Publishing, Page: 70.