Type DLT-T Releasable Reversing Overshot, a new type of fishing tool, has many
advantages owned by various overshot, box tap and the like. Its distinguishing features
are as follows: to unscrew and recover the stuck fish; To release the fish down hole if
necessary; to circulate the washing fluid as one of the accessories for reversing tools. It is
widely used in well servicing.
Structure and Application
Consisting of top sub, spring, bowl, retaining seat, slip, control key, seal ring, seal seat,
guide and so on. The upper end of top sub is connected with other tools and drill tool. The
lower end of top sub is connected with bowl equipped with spring in the interior. There
are three control keys uniformly distributed in the inner wall of the upper end of bowl. the
control keys are used to control the position of retaining seat. Three keys are inserted
separately in three grooves in the tapered interior section of lower end in bowl where three
keys are used to transmit torque. The tapered interior section produces a pinch force