Pressure required to break circulation - Drill string
Input(s)
y: Gel Strength of drilling fluid \(\left(\mathrm{lb} / 100 \mathrm{ft}^{2}\right)\)
L: Length of Drill String (ft)
\(\mathrm{d}\): Inside diameter of drill pipe (in.)
Output(s)
\(P_{g s}\): Pressure to overcome mud's gel strength inside drill string (psi)
Formula(s)
\[
P_{g s}=\left(y * \frac{L}{300 * d}\right)
\]
Reference(s)
Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 79.