Cost per foot of coring

Input(s)

$\mathrm{C}_{\mathrm{b}}$: Core Bit Cost $(\$)$

C: Rig Cost (\$)

$\mathrm{T}_{\mathrm{d}}$: Total Coring Time (h)

$\mathrm{T}_{\mathrm{t}}$: Trip Time (h)

$\mathrm{T}_{\mathrm{r}}$: Core Recovery Time (h)

F: Footage Cored (ft)

$\mathrm{R}_{\mathrm{c}}$: Core Recovery Percentage (fraction)

Output(s)

C: Cost per Foot of Coring $(\$ / f t)$

Formula(s)

$$ \mathrm{C}=\frac{\mathrm{C}_{\mathrm{b}}+\mathrm{C}_{\mathrm{r}} *\left(\mathrm{~T}_{\mathrm{d}}+\mathrm{T}_{\mathrm{t}}+\mathrm{T}_{\mathrm{r}}\right)}{\mathrm{F} * \mathrm{R}_{\mathrm{c}}} $$

Reference(s)

Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 469.