A system includes an overshot body, an engagement mechanism, a cutter body, a disk assembly, and a motor. The overshot body has an overshot conduit. The overshot conduit is configured to receive the external circumferential surface of the tubular body. The engagement mechanism is disposed within the overshot conduit, connected to the overshot body, and configured to engage with the external circumferential surface of the tubular body. The cutter body is connected to the overshot body and is configured to enter the tubular conduit. The disk assembly is rotatably connected to the cutter body. The motor is located within an orifice of the cutter body and is configured to rotate the disk assembly.

A method includes drilling a first bore into a formation to a first depth, the bore having a bore wall and a first diameter that is sufficient to receive a casing pipe. A casing pipe is driven into the drill bore, the casing pipe having a binder on an exterior surface of the casing pipe that is configured to secure the casing pipe to the bore wall, the casing pipe being secured to an anchoring nut at a proximal end. The anchoring nut includes a gripping feature. An anchoring clamp of a drill rig is engaged with the gripping feature of the anchoring nut to thereby anchor the drill rig to the formation. The anchoring clamp includes a plurality of jaws that are movable toward and away from a central axis.

A method includes drilling a first bore into a formation to a first depth, the bore having a bore wall and a first diameter that is sufficient to receive a casing pipe. A casing pipe is driven into the drill bore, the casing pipe having a binder on an exterior surface of the casing pipe that is configured to secure the casing pipe to the bore wall, the casing pipe being secured to an anchoring nut at a proximal end. The anchoring nut includes a gripping feature. An anchoring clamp of a drill rig is engaged with the gripping feature of the anchoring nut to thereby anchor the drill rig to the formation. The anchoring clamp includes a plurality of jaws that are movable toward and away from a central axis.

A jarring device for a coiled tubing of an oil well-bore is disclosed. A sliding assembly of the jarring device which is slideable within a barrel assembly includes a mandrel and a knocker. The barrel assembly comprises a fluid chamber. The fluid chamber includes an upper chamber, a restricted segment and a lower chamber. Further, a braking assembly is attached to the sliding assembly. The braking assembly includes a ring valve made of an alloy belonging to Aluminum-Bronze family of copper alloys, and which is capable of expanding when exposed to pressure. When the braking assembly is moved into restricted segment, and the fluid within the fluid chamber is compressed, flow of fluid through the restricted segment gets blocked due to expansion of the ring. When the braking assembly exits the restricted chamber, a sudden drop in pressure causes the knocker and/or the mandrel to strike the barrel assembly and generate a powerful jarring impact and shock wave.

A jarring device for a coiled tubing of an oil well-bore is disclosed. A sliding assembly of the jarring device which is slideable within a barrel assembly includes a mandrel and a knocker. The barrel assembly comprises a fluid chamber. The fluid chamber includes an upper chamber, a restricted segment and a lower chamber. Further, a braking assembly is attached to the sliding assembly. The braking assembly includes a ring valve made of an alloy belonging to Aluminum-Bronze family of copper alloys, and which is capable of expanding when exposed to pressure. When the braking assembly is moved into restricted segment, and the fluid within the fluid chamber is compressed, flow of fluid through the restricted segment gets blocked due to expansion of the ring. When the braking assembly exits the restricted chamber, a sudden drop in pressure causes the knocker and/or the mandrel to strike the barrel assembly and generate a powerful jarring impact and shock wave.

A releasable locking mechanism 20 for use in a downhole well 10 is provided. The releasable locking mechanism 20 is suitable for use in a cable termination assembly 11. The cable termination assembly 11 is coupled to a downhole apparatus 12 and is configured for coupling a cable line 13 thereto. The releasable locking mechanism 20 includes an extension tube 21 adapted to be coupled to the cable line 13, and a base assembly 23 adapted to be coupled to the cable termination assembly 11. The extension tube 21 and the base assembly 23 are adapted to releasably engage each other in such a manner that when a tensile load in the cable line 13 exceeds a predefined threshold value, the extension tube 21 and the base assembly 23 are disengaged.

A releasable locking mechanism 20 for use in a downhole well 10 is provided. The releasable locking mechanism 20 is suitable for use in a cable termination assembly 11. The cable termination assembly 11 is coupled to a downhole apparatus 12 and is configured for coupling a cable line 13 thereto. The releasable locking mechanism 20 includes an extension tube 21 adapted to be coupled to the cable line 13, and a base assembly 23 adapted to be coupled to the cable termination assembly 11. The extension tube 21 and the base assembly 23 are adapted to releasably engage each other in such a manner that when a tensile load in the cable line 13 exceeds a predefined threshold value, the extension tube 21 and the base assembly 23 are disengaged.

A collet device with an adjustable snap value can have a tubular body and beams. The tubular body can have a main body, an inner member in an inner area of the main body, and an outer member in an area external to the main body. The inner member and the outer member can each be axially moveable relative to the main body. The beams can be axially coupled to the main body, and a portion of the beams may extend axially from the tubular body. A length of the portion of the beams that extend axially from the tubular body can be adjustable by moving the inner member or the outer member for changing a snap value of the collet. The snap value corresponding to a magnitude of force exertable by the beams in a direction of a mating body that can be positioned radially adjacent to the beams.

A collet device with an adjustable snap value can have a tubular body and beams. The tubular body can have a main body, an inner member in an inner area of the main body, and an outer member in an area external to the main body. The inner member and the outer member can each be axially moveable relative to the main body. The beams can be axially coupled to the main body, and a portion of the beams may extend axially from the tubular body. A length of the portion of the beams that extend axially from the tubular body can be adjustable by moving the inner member or the outer member for changing a snap value of the collet. The snap value corresponding to a magnitude of force exertable by the beams in a direction of a mating body that can be positioned radially adjacent to the beams.

A washover tool including an inner housing and an outer housing forming an enclosed annulus. The washover tool includes a rod member coupled to the outer housing, the rod member configured to supply a fluid to the annulus. The washover tool includes a front face plate having a plurality of openings in fluid communication with the annulus. The annulus of the washover tool is configured to receive a fluid through the rod member and configured to eject the fluid through the plurality of openings of the front face plate to washover a pipe embedded in a ground.