Drilling Cost per Foot
Drilling Cost per Foot Formula |
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\( D_c \;=\; \dfrac{ B_c + R_c \cdot ( R_t + R ) }{ F } \) (Drilling Cost per Foot) \( B_c \;=\; \dfrac{ D_c - R_c \cdot ( R_t + R ) }{ F }\) \( R_c \;=\; \dfrac{ ( D_c - B_c ) \; F }{ R_t + R }\) \( R_t \;=\; \dfrac{ ( D_c - B_c ) \cdot F }{ R_c } - R \) \( R \;=\; \dfrac{ ( D_c - B_c ) \cdot F }{ R_c } - R_t \) \( F \;=\; \dfrac{ R_c \cdot ( R_t + R ) }{ D_c - B_c } \) |
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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