What is Casing spear ？

The fishing spear is an internal fishing tool. It can salvage drill pipes, tubing, milling pipes, liners, packers, water distributors, co-products, and other falling objects with internal holes.It can also be used with other tools (such as jars, inverted devices) for falling objects that are stuck. Fishing spears can be divided into inverted and non-inverted types according to their uses; they can be divided into retractable and non-retractable types according to their use characteristics; according to the structure of the salvage element, they can be divided into threaded butt-buckled and slip-on types