Drilling String Displacement

Drilling string displacement, abbreviated as DSD, is when either pulling out of a hole or trip in a hole for any kind of pipes such as drill pipe, casing or tubing, you should know how much fluid to displace the volume of the drillstring.

 

Drilling String Displacement Formula
\( DS_d \;=\;  \dfrac{ ( D_{pod}^2 - D_{pid}^2 ) \cdot l  }{ 1029.4 }\)     (English) \( DS_d \;=\;  \dfrac{  ( D_{pod}^2 - D_{pid}^2 ) \cdot l }{ 1273.24 }\)     (Metric)
Symbol	English	Metric
\( DS_d \) = Drillstring Displacement	\( bbl \)	\( l \)
\( D_{pod} \) = Casing / Drill Pipe OD	\(in\)	\( mm \)
\( D_{pid} \) = Casing / Drill Pipe ID	\(in\)	\( mm \)
\( l \) = Length of Drill Hole	\(ft\)	\( m \)