Downhole tool releasing mechanism

摘要

A downhole tool releasing mechanism which includes a collet 814) for releasably engaging a mandrel (41) of a downhole tool. A retaining band (30) is circumferentially disposed about the fingers (16) of the collet (14) for maintaining engagement of the collet and the mandrel prior to application of a predetermined axially directed force on the releasing mechanism (10). Upon application of such a force the collet fingers (16) expand, breaking the shear band (30), the mandrel (41) is released and the downhole tool is disengaged.