Pressure required to overcome gel strength of mud inside the drill string
Input(s)
y: Gel Strength of Drilling Fluid \(\left(\mathrm{lb} / 100 \mathrm{ft}^{2}\right)\)
d: Inside Diameter of Drill Pipe (in.)
L: Length of Drill String ( \(\mathrm{ft}\) )
Output(s)
\(\mathrm{P}_{\mathrm{m}}\): Pressure Required (psi)
Formula(s)
\[
\mathrm{P}_{\mathrm{m}}=\frac{\mathrm{y} * \mathrm{~L}}{300 * \mathrm{~d}}
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 79.