Plug length to set a balanced cement plug
Input(s)
\(\mathrm{N}_{\mathrm{s}}\): Number of Sacks of Cement to be Used (stroke)
AC: Annular Capacity \(\left(\mathrm{ft}^{3} / \mathrm{ft}\right)\)
\(\mathrm{P}_{\mathrm{c}}\): Pipe or Tubing Capacity \(\left(\mathrm{ft}^{3} / \mathrm{ft}\right)\)
E: Original+extra Volume Req in Percentage (fraction) \(\mathrm{Y}_{\mathrm{s}}\) :Yield of Slurry \(\left(\mathrm{ft}^{3} /\right.\) stroke \()\)
Output(s)
\(\mathrm{L}_{\mathrm{p}}\): Length of Plug (stroke)
Formula(s)
\[
\mathrm{L}_{\mathrm{p}}=\frac{\mathrm{N}_{\mathrm{s}} * \mathrm{Y}_{\mathrm{s}}}{\mathrm{AC} * \mathrm{E}+\mathrm{P}_{\mathrm{c}}}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 61.