A wellbore system includes an adapter configured to couple to a downhole component. The wellbore system also includes a retrieval tubular, having a bore extending therethrough. The wellbore system further includes a piston assembly coupled to the retrieval tubular, wherein the bore is in fluid communication with a cavity of the piston assembly. The wellbore system includes a stem configured to couple to a casing section, the casing section being supported by a hanger. The wellbore system also includes a sleeve forming at least a portion of the piston assembly, the sleeve configured to couple to the adapter such that, responsive to a force applied by the piston at the casing section, the sleeve applies an upward force to the adapter.

A method and apparatus provide for separating a fluid conveyance, such as coiled tubing, wherein the apparatus includes an anchor section and a carrier that, when united, create an explosive force, separating the fluid conveyance.

A setting tool includes a barrel piston that is configured to couple to a setting sleeve and defines a working surface and a vent port. An upper mandrel is disposed within the barrel piston and defines a power charge chamber that is configured to receive a power charge and includes an upper threaded portion, a lower internal thread, and a plurality of axial discharge ports disposed circumferentially around the lower internal thread. The plurality of axial discharge ports are in fluid communication at one end with the power charge chamber and at the other end with the working surface of the barrel piston. A lower mandrel has an upper end and a lower end, with the upper end in threaded engagement with the lower internal thread of the upper mandrel, and the lower end configured to couple to a frac plug. The power charge chamber includes an upper chamber and a lower chamber, with the lower chamber shaped to open to be in fluid communication with each of the plurality of axial discharge ports. The barrel piston is configured for axial displacement with respect to the upper mandrel to position the vent port in fluid communication with the power charge chamber.

A tie-back string and a method of coupling the tie-back string to a casing is disclosed. The tie-back string is disposed within the casing. The tie-back string includes an anchor and an actuator section. The actuator section including a sleeve that forms a first chamber and a setting piston that forms a second chamber. A pressure differential is created between the first chamber and the second chamber to move the setting piston to engage the anchor of the tie-back string.

An annular pressure activated downhole tool has a housing including an outer surface, an inner surface defining a passage, an annular projection projecting into the passage from the inner surface, and an opening. A mandrel extends into the passage. The mandrel has a first end and a second end. A power spring support is detachably connected to the second end of the mandrel in the passage. A power spring is arranged about the mandrel and extends between the power spring support and the annular projection. A trigger housing is arranged in one of the mandrel and the power spring support. A trigger arranged in the trigger housing selectively engages with the inner surface. The trigger is operable to disengage from the inner surface of the housing, releasing the power spring, and shifting the mandrel along the passage when exposed to a selected annular pressure.

A tie-back string and a method of coupling the tie-back string to a casing is disclosed. The tie-back string is disposed within the casing. The tie-back string includes an anchor and an actuator section. The actuator section including a sleeve that forms a first chamber and a setting piston that forms a second chamber. A pressure differential is created between the first chamber and the second chamber to move the setting piston to engage the anchor of the tie-back string.

A hydraulic thruster system for providing an axial force. In one embodiment, the system comprises a pump, a motor for driving the pump, and a hydraulic thruster comprising: a cylinder comprising a plurality of cylinder pistons; a shaft comprising a plurality of shaft pistons; a plurality of first pressure chambers; and a plurality of second pressure chambers, wherein the plurality of shaft pistons are positioned inside the cylinder, between the cylinder pistons to form the plurality of first and a second pressure chambers, wherein the shaft further comprises a first fluid passage connected to the pump and to the first pressure chambers, and a second fluid passage connected to the pump and to the second pressure chambers, and wherein the pump may pump fluid into the first pressure chambers and suction fluid from the second pressure chambers providing an axial force between the shaft and the cylinder.

A thru-tubing recover string (10) and method of moving a stuck object (14) in tubing in a well (16). A bottom hole assembly (22) is connected to a work string and includes a first (32) and a second tool (34), each tool configured to apply a force to the object in order to move the object (14), the first force being an impulse force, the second force being a static force, and the tools being operable independently so that an operator can apply either force in the event that application of one type of force on the object fails to move the object. Embodiments are described for the first tool (32) being a hammer tool or a jar and the second tool being a pulling tool such as a jack. The invention finds application in removing stuck objects such as plugs or actuating elements on tools such as sliding sleeves in production tubing.

A disposable setting tool includes a housing having a first end, a second end, and an intermediate portion having an outer surface and an inner surface defining a passage. A piston assembly is arranged in the passage. The piston assembly including a first piston portion and a second piston portion that extends axially outwardly of the second end of the housing. The first piston portion includes a first end portion, a second end portion, and an intermediate section having an outer surface portion and an inner surface portion that extends between the first end portion and the second end portion. The inner surface portion defines a pressure passage. An atmospheric chamber is defined between the inner surface of the housing and the outer surface portion of the piston assembly.

A single use setting tool and associated method for actuating a tool in a wellbore may include an inner piston having a piston proximal end, a piston distal end, and a piston annular wall that defines a piston cavity. The setting tool may include a gas-generating power charge positioned within the piston cavity. The power charge may extend along a longitudinal axis from a proximal end to a distal end and have at least two different widths along its length. The power charge may further include a tapered portion. The setting tool may further include a piston extension connected to the piston distal end. The inner piston may further include a shear element groove circumferentially extending in an outer surface of the inner piston, for receiving a shear element.