Critical velocity for change in flow regime

Input(s)

PV: Plastic Viscosity (cP)

YP: Yield Stress or Yield Point $\left(\mathrm{lb} / 100 \mathrm{ft}^{2}\right)$

$\rho_{\mathrm{m}}$: Mud Density (ppg)

$\mathrm{D}_{\mathrm{i}}$: inside Diameter of Pipe (in.)

Output(s)

$\mathrm{V}_{\mathrm{c}}$: Critical Velocity $(\mathrm{ft} / \mathrm{s})$

Formula(s)

Reference(s)

Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 220.