# 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.

## Related

### Cost per foot of coring

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