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.