Cost per foot during drilling
Input(s)
\(\mathrm{C}_{\mathrm{b}}\): Bit Cost \((\$)\)
\(\mathrm{C}_{\mathrm{to}}\): Tool Cost \((\$)\)
\(\mathrm{C}_{\mathrm{m}}\): Mud Cost \((\$)\)
\(\mathrm{T}_{\mathrm{d}}\): Drilling Time (h)
\(\mathrm{T}_{\mathrm{t}}\): Trip Time (h)
\(\mathrm{T}_{\mathrm{c}}\): Connection Time and Extras (h)
\(\mathrm{C}_{\mathrm{r}}\): Rig Rate \((\$ / \mathrm{h})\)
\(\mathrm{C}_{\mathrm{s}}\): Support Rate \((\$ / \mathrm{h})\)
C \(_{\mathrm{t}}\): Tool Rental Rate \((\$ / \mathrm{h})\)
F: Footage (ft/h)
\(\mathrm{T}_{\mathrm{d}}\): Drilling Time (h)
Output(s)
\(\mathrm{C}_{\mathrm{d}}\): Cost of Drilling Per Foot \((\$ / \mathrm{h})\)
Formula(s)
\[
\mathrm{C}_{\mathrm{d}}=\frac{\mathrm{C}_{\mathrm{b}}+\mathrm{C}_{\mathrm{to}}+\mathrm{C}_{\mathrm{m}}+\left(\mathrm{T}_{\mathrm{d}}+\mathrm{T}_{\mathrm{t}}+\mathrm{T}_{\mathrm{c}}\right) *\left(\mathrm{C}_{\mathrm{r}}+\mathrm{C}_{\mathrm{s}}+\mathrm{C}_{\mathrm{t}}\right)}{\mathrm{F} * \mathrm{~T}_{\mathrm{d}}}
\]
Reference(s)
Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 468.