Coiled-tubing workover:A workover performed with a continuous steel tube, normally 3/4 inch to 1 inch outside diameter, which is run into the well in one piece inside the normal tubing.
Lengths of the tubing up to 16,000 feet are stored on the surface on a reel in a manner similar to that used for wireline.
The unit is rigged up over the wellhead.
The tubing is injected through a control head that seals off the tubing and makes a pressure-tight connection.
A unique feature of the unit is that it allows continuous circulation while it is being lowered into the hole.