Disengageable downhole tool

摘要

A disengageable downhole tool ( 10 ) for use in the oil and gas industry. The tool can be decoupled from a work string to allow further tools to be operated from the work string on being run deeper into a well. The tool is then picked-up by the work string on retrieval from the well. In one embodiment a milling tool ( 28, 32 ) is described having a hex-drive system for operation of the tool from the work string with coupling and decoupling being achieved via shear pins ( 40 ) and a mating ledge and shoulder.