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.