Abstract: 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.

Abstract: There are disclosed a method and apparatus for severing a tubular member at a desired level beneath the ocean floor or other underwater surface from which the tubular member extends. The apparatus includes an assembly which is disposable about the tubular member at the underwater surface, and which includes means by which fluid may be jetted for scouring the underwater surface about the tubular member in order that the assembly may move downwardly under its own weight. The tubular member is severed by means of a shaped charge carried by the assembly and adapted to be detonated when lowered with the assembly to the desired level.

Abstract: There is disclosed a tool comprising a body having an opening which may be moved over a nut threaded onto a bolt and a surface on the opening to support the flat side of the nut, a bore in the body connected at one end with the opening opposite the supporting surface, and a rod having a cutting edge longitudinally reciprocal within the bore toward and away from the nut in the opening. The rod is so reciprocated by an operating system which includes a piston on the rod reciprocable within a cylinder on the body connecting with the other end of the bore.