A vibratory casing recovery bottom hole assembly and a method of recovering casing in a wellbore. The vibratory casing recovery bottom hole assembly includes a casing spear, a flow modifier and a dynamic amplification tool. The flow modifier produces cyclic variations in fluid pressure through the assembly at a first frequency and the bottom hole assembly is configured to have a natural or resonant frequency when vibrated to be near or at the first frequency. The dynamic amplification tool induces vibration in the bottom hole assembly while ensuring the dynamic amplification factor of the system is greater than one so as to transmit maximum vibration to the casing at the casing spear. Embodiments of dynamic amplification tools are described.

A vibratory casing recovery bottom hole assembly and a method of recovering casing in a wellbore. The vibratory casing recovery bottom hole assembly includes a casing spear, a flow modifier and a dynamic amplification tool. The flow modifier produces cyclic variations in fluid pressure through the assembly at a first frequency and the bottom hole assembly is configured to have a natural or resonant frequency when vibrated to be near or at the first frequency. The dynamic amplification tool induces vibration in the bottom hole assembly while ensuring the dynamic amplification factor of the system is greater than one so as to transmit maximum vibration to the casing at the casing spear. Embodiments of dynamic amplification tools are described.

A wellbore assembly including a cable disposed within a wellbore and a fishing jar assembly coupled to the cable. The fishing jar assembly includes a housing assembly, a mandrel assembly, a fishing assembly, and an actuator. The housing assembly has an inwardly projecting shoulder defining an anvil surface and a hydraulic fluid chamber housing hydraulic fluid. The mandrel is movable along a central axis of the housing assembly and has an outwardly projecting shoulder that defines a hammering surface to strike the anvil surface. The mandrel assembly defines a piston disposed within the hydraulic fluid chamber. The fishing assembly engages a component stuck within the wellbore. The actuator moves the piston of the mandrel assembly along the longitudinal axis to pressurize the hydraulic fluid until the hydraulic fluid bleeds past a fluid port allowing the mandrel assembly to trip to strike the anvil surface with the hammering surface.

A wellbore assembly including a cable disposed within a wellbore and a fishing jar assembly coupled to the cable. The fishing jar assembly includes a housing assembly, a mandrel assembly, a fishing assembly, and an actuator. The housing assembly has an inwardly projecting shoulder defining an anvil surface and a hydraulic fluid chamber housing hydraulic fluid. The mandrel is movable along a central axis of the housing assembly and has an outwardly projecting shoulder that defines a hammering surface to strike the anvil surface. The mandrel assembly defines a piston disposed within the hydraulic fluid chamber. The fishing assembly engages a component stuck within the wellbore. The actuator moves the piston of the mandrel assembly along the longitudinal axis to pressurize the hydraulic fluid until the hydraulic fluid bleeds past a fluid port allowing the mandrel assembly to trip to strike the anvil surface with the hammering surface.

A bottomhole assembly for performing a sidetracking operation in a casing of a wellbore. A fluid intensifier is configured to receive fluid and configured to increase a pressure of the fluid. A fluid jetting nozzle is associated with a body of the bottomhole assembly. A fluid jetting nozzle is fluidly coupled to the fluid intensifier and is configured to receive pressurized fluid from the fluid intensifier. A fluid jetting nozzle is configured to cut a window into the casing via the pressurized fluid. A side arm is movable between a closed position wherein the side arm is retracted and a guiding position wherein the side arm is extended. The side arm is configured to contact the casing in the guiding position to guide the body within the casing. A hook is configured to couple to the cut window and remove the cut window from the casing.

A release mechanism for a jarring tool is formed by a plurality of segmented release lugs. Each lug includes a plurality of axial spaced projections on an inner surface and a plurality of grooves on an outer surface. The projections have either different widths or are separated by varying distances and releasably engage corresponding grooves in a mandrel located within a housing of the tool. The release lugs are positioned between a trigger sleeve and the mandrel.

A wellbore assembly including a cable disposed within a wellbore and a fishing jar assembly coupled to the cable. The fishing jar assembly includes a housing assembly, a mandrel assembly, a fishing assembly, and an actuator. The housing assembly has an inwardly projecting shoulder defining an anvil surface and a hydraulic fluid chamber housing hydraulic fluid. The mandrel is movable along a central axis of the housing assembly and has an outwardly projecting shoulder that defines a hammering surface to strike the anvil surface. The mandrel assembly defines a piston disposed within the hydraulic fluid chamber. The fishing assembly engages a component stuck within the wellbore. The actuator moves the piston of the mandrel assembly along the longitudinal axis to pressurize the hydraulic fluid until the hydraulic fluid bleeds past a fluid port allowing the mandrel assembly to trip to strike the anvil surface with the hammering surface.

A wellbore assembly including a cable disposed within a wellbore and a fishing jar assembly coupled to the cable. The fishing jar assembly includes a housing assembly, a mandrel assembly, a fishing assembly, and an actuator. The housing assembly has an inwardly projecting shoulder defining an anvil surface and a hydraulic fluid chamber housing hydraulic fluid. The mandrel is movable along a central axis of the housing assembly and has an outwardly projecting shoulder that defines a hammering surface to strike the anvil surface. The mandrel assembly defines a piston disposed within the hydraulic fluid chamber. The fishing assembly engages a component stuck within the wellbore. The actuator moves the piston of the mandrel assembly along the longitudinal axis to pressurize the hydraulic fluid until the hydraulic fluid bleeds past a fluid port allowing the mandrel assembly to trip to strike the anvil surface with the hammering surface.

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 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.