Control drilling - Maximum drilling rate

Input(s)

q: Circulation Rate (gpm)

$\mathrm{D}_{\mathrm{h}}$: Hole Diameter (in.)

MW $_{\mathrm{o}}$: Mud Wt. out (ppg)

MW $_{\mathrm{i}}$: Mud Wt. in (ppg)

Output(s)

MDR: Maximum Drilling Rate (ft/h)

Formula(s)

$$ \mathrm{MDR}=67 *\left(\mathrm{MW}_{\mathrm{o}}-\mathrm{MW}_{\mathrm{i}}\right) * \frac{\mathrm{q}}{\left(\mathrm{D}_{\mathrm{h}}\right)^{2}} $$

Notes: The formula is valid when drilling in large diameter holes (14 3/4 in. and Larger).

Reference(s)

Lyons, W. C., Carter, T., and Lapeyrouse, N. J., 2012, Formulas and Calculations for Drilling, Production and Workover, Third Edition, Gulf Professional Publishing, Page: 24.