Annular Capacity

on . Posted in Drilling Engineering

annular capacity and annular volume 1Annular capacity, abbreviated as AC, also called annular volume, is used to determining the volume of drilling fluids that can be held in the annular space between the drill string (casing) and the wellbore.

 

Annular Capacity formula 

\( AC \;=\;  ( D_h^2 - D_{pod}^2 ) \;/\; 1029.4 \)     (\(bbl\;/\;ft\))

\( AC \;=\;  ( D_h^2 - D_{pod}^2 ) \;/\; 24.51 \)     (\(gal\;/\;ft\))

\( AC \;=\;  ( D_h^2 - D_{pod}^2 ) \;/\; 1,273,240 \)     (\(m^3\;/\;m\))

\( AC \;=\;  ( D_h^2 - D_{pod}^2 ) \;/\; 1,273.24 \)     (\(l\;/\;m\))

Symbol English Metric
\( AC \) = Annular Capacity - -
\( D_h \) = Drill Hole Size \(in\) -
\( D_{pod} \) = Casing / Drill Pipe OD \(in\) -

   

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Tags: Drilling Annular