Drilling Cost per Foot
Drilling Cost per Foot formula |
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\( D_c = B_c + R_c \; ( R_t + R ) \;/\; F \) (Drilling Cost per Foot) \( B_c = D_c - R_c \; ( R_t + R ) \;/\; F \) \( R_c = ( D_c - B_c ) \; F \;/\; R_t + R \) \( R_t = [\;( D_c - B_c ) \; F \;/\; R_c\;] - R \) \( R = [\;( D_c - B_c ) \; F \;/\; R_c\;] - R_t \) \( F = R_c \; ( R_t + R ) \;/\; D_c - B_c \) |
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| Symbol | English | Metric |
| \( D_c \) = drilling cost per foot | \(cost\) | - |
| \( B_c \) = bit cost | \(cost\) | - |
| \( R_c \) = rig cost | \(cost\;/\;hr\) | - |
| \( R_t \) = rotating time | \(hrs\) | - |
| \( R \) = round trip time (for depth) | \(hrs\) | - |
| \( F \) = footage per bit | \(ft\) | - |
Tags: Drilling