Abstract: An apparatus and method for creating axial movement of an inner sliding sleeve member on a tool in a downhole environment. The apparatus has keys which mate in a profile on the inner sliding sleeve member, the keys being held in a carrier on a sleeve around an inner mandrel. The inner mandrel includes stops and a lip which can be slid over the keys to retract them for release from the inner sliding sleeve member. By picking up and shifting down the mandrel relative to the sleeve, the apparatus is cycled to jar up, jar down and release. An exercise tool to release a stuck flow tube of a subsurface safety valve is described.

Abstract: Method and apparatus for creating a fluid communication line in a downhole environment between an annular chamber and a throughbore of a tool. The tubular wall therebetween is provided with circumferentially arranged recesses extending into the wall to provide selected thin-walled sections for perforation by a communication tool. The communication tool has two oppositely arranged punch heads, one aligned with a recess and the other between neighbouring recesses giving an orientationless configuration in operation. An embodiment for creating a fluid communication line through a tubing retrievable safety valve for operation of a wireline retrievable safety valve located therein is described.

Abstract: A packer for anchoring and sealing to a tubular in a well, the packer including a packer element, an anchoring arrangement, a setting mechanism and a release mechanism. The release mechanism holds a thin-walled section of tubing in the packer in tension using a biasing mechanism. On severing the tubing, the bias releases an engagement mechanism which allows the anchor arrangement and the packing element to move relative to the body and thereby unset the packer. An embodiment of a dual bore packer is described. A method of well isolation is described, with an assembly including the dual bore packer. The primary bore forms the short string and a secondary bore forms the long string. By severing the short string the integrity of the long string is maintained to pull lower devices on the long string and the short string does not require tension below the packer to release.