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.