Drilling Cost per Foot

on . Posted in Drilling Engineering

  

Drilling Cost per Foot formula

\( D_c = B_c + R_c \; ( R_t + R ) \;/\; F  \)     (Drilling Cost per Foot)

\( B_c = D_c - R_c \; ( R_t + R ) \;/\; F  \)

\( R_c = ( D_c - B_c ) \; F \;/\;  R_t + R  \)

\( R_t = [\;( D_c - B_c ) \; F \;/\;  R_c\;]  - R  \)

\( R = [\;( D_c - B_c ) \; F \;/\;  R_c\;]  - R_t  \)

\( F =  R_c \; ( R_t + R ) \;/\; D_c - B_c  \)

Symbol English Metric
\( D_c \) = drilling cost \(cost\) -
\( B_c \) = 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 \(ft\) -

  

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Tags: Drilling