TIANHE OVERSHOT is a external tools ,similar to Bowen type ,size from 89mm ~340mm OD .

The releasing and circulating overshot is the special external fishing tool used for fishing drill collar ,drill pipe,tubing and other fishes in drilling and work over operation. It is designed according to the sizes of drill collar,drill pipes .couplings and other oil well tubes . When fish is gripped but can not be released , the releasing overshot is used to release the fish and lift it up to the ground.

RELEASEING & CIRCULATING OVERSHOT