Mechanical specific energy
Input(s)
WOB: Weight on Bit (lbf)
\(\mathrm{A}_{\mathrm{b}}\): Area of Bit (in. \({ }^{2}\) )
\(\mathrm{N}\): Rotational Speed of Bit (in./m)
\(\mathrm{T}\): Torque of Bit (lbf in.)
ROP: Rate of Penetration (m/in.)
Output(s)
MSE: Mechanical Specific Energy (lbf/in. \({ }^{2}\) )
Formula(s)
\[
\mathrm{MSE}=\left(\frac{\mathrm{WOB}}{\mathrm{A}_{\mathrm{b}}}\right)+\left(\frac{120 * \pi * \mathrm{~N} * \mathrm{~T}}{\mathrm{~A}_{\mathrm{b}} * \mathrm{ROP}}\right)
\]
Reference(s)
Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 414.