Maximum weight of a Bit Formula |
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\( WOB \;=\; \dfrac{ L_c \cdot W_c \cdot BF \cdot cos(\alpha) }{ SF }\) (Maximum Weight of a Bit) \( L_c \;=\; \dfrac{ WOB \cdot SF }{ W_c \cdot BF \cdot cos(\alpha) }\) \( W_c \;=\; \dfrac{ WOB \cdot SF }{ L_c \cdot BF \cdot cos(\alpha) }\) \( BF \;=\; \dfrac{ WOB \cdot SF }{ L_c \cdot W_c \cdot cos(\alpha) }\) \( cos(\alpha) \;=\; \dfrac{ WOB \cdot SF }{ L_c \cdot W_c \cdot BF }\) \( SF \;=\; \dfrac{ L_c \cdot W_c \cdot BF \cdot cos(\alpha) }{ WOB }\) |
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| Symbol | English | Metric |
| \( WOB \) = Maximum Weight of a Bit | \(lbf\) | - |
| \( L_c \) = Length of Drill Collar | \(ft\) | - |
| \( W_c \) = Weigth of Drill Collar | \(lbf\) | - |
| \( BF \) = Bouyancy Factor | \(dimensionless\) | - |
| \( \alpha \) (Greek symbol alpha) = Wellbore Inclination | \(rad\) | - |
| \( FS \) = Safety Factor | \(dimensionless\) | - |
