Tool for washing over, cutting and retrieving a portion of a pipe within a well bore

摘要

There is disclosed a tool for washing over, cutting and retrieving a portion of a pipe or "fish" stuck within a well bore. The tool includes flipper dogs which may move downwardly over a coupling on the pipe, and then raised into gripping engagement with the pipe beneath the coupling, and knives which are forced inwardly into gripping engagement with the pipe in response to an upward strain on the pipe string following engagement of the flipper dogs with the pipe, whereby the pipe may be cut upon rotation of the pipe string.