(Solved): Calculate the maximum flow rate (optimum flow rate) that gives a laminar flow between drill pipe an ...

Calculate the maximum flow rate (optimum flow rate) that gives a laminar flow between drill pipe and hole during drilling the below section given the below information: Section depth \( =7500 \mathrm{ft} \) Section size \( =12 \frac{1}{4} \) " Mud: \( \mathrm{MW}=11.6 \mathrm{ppg} \) \( \mathrm{PV}=11 \mathrm{cp} \) \( \mathrm{YP}=13 \mathrm{lb} / 100 \mathrm{ft} 2 \) Drill string: \( \begin{array}{l}\mathrm{DP}=4 ", 15.7 \mathrm{lb} / \mathrm{ft}, \text { grade } \mathrm{x}, \text { Premium class } \\ \mathrm{DC}=6 ", 90 \mathrm{lb} / \mathrm{ft}\end{array} P_{\mathrm{C}}=13820 \mathrm{psi} \)