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