Abstract: A downhole plug and a method of releasing a portion of the plug. The plug has a run-in configuration, a deployed configuration, and a released configuration. The plug includes a mandrel, a bull nose, and a cone and an expandable slip. The expandable slip has an external gripping surface. The plug includes an inner and outer sleeve, where the outer sleeve is concentric around the inner sleeve and the inner sleeve is concentric with the mandrel. The inner sleeve is slidable about but releasingly coupled to the mandrel. The inner sleeve is slidable about the outer sleeve but releasingly coupled to the outer sleeve in both the run-in configuration and in the deployed configuration. The inner sleeve is coupled with the mandrel in the run-in configuration and in the deployed configuration, but uncoupled and slidable about the mandrel in the released configuration.

Abstract: An apparatus for deploying and activating a downhole tool activated by an explosive charge such as a drill pipe cutter or hole puncher. The apparatus includes a sealing member with an external wedge-shaped profile that forms a metal-to-metal partial seal with a profile at the top end of a pipe joint in a drill pipe string. The apparatus includes an impact force absorbing device that maintains a firing rod in a non-actuated position during impact of the apparatus. The apparatus includes a differential pressure piston that actuates at a pre-determined well bore pressure to release the firing rod to activate the downhole tool.

Abstract: An apparatus for deploying and activating a downhole tool activated by an explosive charge such as a drill pipe cutter or hole puncher. The apparatus includes a sealing member with an external wedge-shaped profile that forms a metal-to-metal partial seal with a profile at the top end of a pipe joint in a drill pipe string. The apparatus includes an impact force absorbing device that maintains a firing rod in a non-actuated position during impact of the apparatus. The apparatus includes a differential pressure piston that actuates at a pre-determined well bore pressure to release the firing rod to activate the downhole tool.

Abstract: A subterranean well tool which is manipulatable by a control mandrel between run-in and set positions within a wellbore having casing includes an assembly which provides a selectively operable lock to prevent premature activation of the assembly from the run-in position towards the set position until a predeterminable compressive load is carried through the well tool by the control mandrel to manipulate the assembly from a first initial position to an intermediate position and thereafter to a final extended position.