Spool, drilling
18 July 2017
Spud in
18 July 2017


1) to move the drill stem up and down in the hole over a short distance without rotation. Careless execution of this operations creates pressure surges that can cause a formation to break down, resulting in lost circulation.

2) to force a wireline tool or tubing down the hole by using a reciprocating motion.

3) to begin drilling a well (i.e., to spud in).