Maximum Weight of a Bit

on . Posted in Drilling Engineering

    

 Maximum weight of a Bit formula

\( WOB \;=\;  L_c \; W_c \; BF \; cos(\alpha) \;/\; SF  \)     (Maximum Weight of a Bit)

\( L_c \;=\;  WOB \; SF \;/\; W_c \; BF \; cos(\alpha)  \)

\( W_c \;=\;  WOB \; SF \;/\; L_c \; BF \; cos(\alpha)  \)

\( BF \;=\;  WOB \; SF \;/\; L_c \; W_c \; cos(\alpha)  \)

\( cos(\alpha) \;=\;  WOB \; SF \;/\; L_c \; W_c \; BF  \)

\( SF \;=\;  L_c \; W_c \; BF \; cos(\alpha) \;/\; WOB  \)

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 \(dimensionless\) -

 

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Tags: Drilling Drilling Bit