A jarring tool used to dislodge a stuck tubular string or bottom hole assembly within an underground wellbore. A funnel element is placed underground either within, or as part of, a tubular string. A deformable ball may be seated within the funnel element to block fluid from passing within the tubular string. Hydraulic pressure may build within the tubular string until it exceeds the pressure the ball can withstand. This will cause the ball to deform and be expelled through the funnel element. With no ball to block its flow, fluid will be rapidly released through the funnel element. The rapid release of fluid will cause a powerful jarring or jolting to the tubular string or bottom hole assembly. Deformed balls may be captured in a cartridge chamber installed within the drill string and sized to create turbulent fluid flow within the drill string.

A jarring tool used to dislodge a stuck tubular string or bottom hole assembly within an underground wellbore. A funnel element is placed underground either within, or as part of, a tubular string. A deformable ball may be seated within the funnel element to block fluid from passing within the tubular string. Hydraulic pressure may build within the tubular string until it exceeds the pressure the ball can withstand. This will cause the ball to deform and be expelled through the funnel element. With no ball to block its flow, fluid will be rapidly released through the funnel element. The rapid release of fluid will cause a powerful jarring or jolting to the tubular string or bottom hole assembly. Deformed balls may be captured in a cartridge chamber installed within the drill string and sized to create turbulent fluid flow within the drill string.

A fishing jar includes an outer housing, a mandrel positioned at least partially within the outer housing and having a fish end, an anvil coupled to or integral with the mandrel, a hammer coupled to or integral with the outer housing, and a triggering mechanism partitioning a first chamber and a second chamber, the first and second chambers separated axially apart and in fluid communication via the triggering mechanism. The triggering mechanism is configured to permit hydraulic fluid to flow from the first chamber to the second chamber at a first rate in response to pressing the outer housing to move toward the fish end of the mandrel during a downstroke of the outer housing, until the outer housing reaches a trigger position, and then permit the hydraulic fluid to flow from the first chamber to the second chamber at a second rate until the hammer impacts the anvil.

A jarring tool includes a spring and a hydraulic piston cylinder arrangement for controlling the release of a mandrel to initiate a jarring force. The tool includes an adjustment mechanism for adjusting the minimum amount of an upward pulling force required to release the mandrel. The adjustment mechanism includes an axially adjustable trigger sleeve that cooperates with a dog clutch surrounding the mandrel.

A jarring tool includes a spring and a hydraulic piston cylinder arrangement for controlling the release of a mandrel to initiate a jarring force. The tool includes an adjustment mechanism for adjusting the minimum amount of an upward pulling force required to release the mandrel. The adjustment mechanism includes an axially adjustable trigger sleeve that cooperates with a dog clutch surrounding the mandrel.

A mechanical service tool that may include one or more anchors, a cutter, a communication and control system, and one or more sensors, as well as methods for operating the mechanical service tool, are provided. The one or more anchors may extend radially from the mechanical service tool and the cutter may move relative to the mechanical service tool. The cutter may include a drilling bit. The communication and control system may obtain remote commands that control the cutter, the one or more anchors, or both. The one or more sensors may detect operational conditions of the mechanical service tool and may be operatively coupled to the communication and control system.

A modular boost system can be added to a jack to enable greater lift capacity of the jack. One example can involve a jack that is positionable at a well surface for moving a tubing string through a wellbore in a subterranean formation. The jack can include a frame and an adjustable plate that is alternately (i) attachable at a stationary location in the frame for fixing the adjustable plate at the stationary location or (ii) detachable from the stationary location in the frame to enable the adjustable plate to vertically move within the frame. A boost cylinder can be removably coupled to the adjustable plate and a base for selectively supplying an additional lift capability to the jack.

A system includes a deployment device and an adjustable mill. The deployment device has a box end with internal threads. The adjustable mill has a tubular body, a cylinder, and a lock ring. The tubular body has a lateral end and a pin end. The pin end has external threads, the lateral end is partially enveloped by cutters, and the lateral end comprises an inner wall defining an orifice. The cylinder is movably disposed within the orifice. The cylinder is partially enveloped by the cutters. The lock ring is disposed circumferentially around the cylinder. The lock ring interacts with a lock ring seat machined into the inner wall of the lateral end to place the adjustable mill in a mode. The internal threads of the adjustable mill and the external threads of the deployment device interact to form a connection between the adjustable mill and the deployment device.

A system includes a deployment device and an adjustable mill. The deployment device has a box end with internal threads. The adjustable mill has a tubular body, a cylinder, and a lock ring. The tubular body has a lateral end and a pin end. The pin end has external threads, the lateral end is partially enveloped by cutters, and the lateral end comprises an inner wall defining an orifice. The cylinder is movably disposed within the orifice. The cylinder is partially enveloped by the cutters. The lock ring is disposed circumferentially around the cylinder. The lock ring interacts with a lock ring seat machined into the inner wall of the lateral end to place the adjustable mill in a mode. The internal threads of the adjustable mill and the external threads of the deployment device interact to form a connection between the adjustable mill and the deployment device.

A jarring tool used to dislodge a stuck tubular string or bottom hole assembly within an underground wellbore. Tubular strings with which the tool may be used may be formed from drill pipe, jointed pipe, or coiled tubing. A funnel element is placed underground either within, or as part of, a tubular string. A deformable ball may be seated within the funnel element to block fluid from passing within the tubular string. Hydraulic pressure may build within the tubular string until it exceeds the pressure the ball can withstand. This will cause the ball to deform and be expelled through the funnel element. With no ball to block its flow, fluid will be rapidly released through the funnel element. The rapid release of fluid will cause a powerful jarring or jolting to the tubular string or bottom hole assembly.