The device is designed for borehole reaming during casing—casing reamer shoes mounted in the conductor guide hole of a string or liner. The casing reamer shoe has a sub connected via a sleeve with a spiral mandrel having at least one screw groove, and a mandrel with a drill shoe located at one end thereof, and a pipe with at least one pin at the other end. The mandrel is mounted movably on the spiral mandrel inside a case being rigidly connected to the sub. The pin is arranged in the groove. The cross section of the screw groove has a shape of a trapezoid expanding in the direction of the longitudinal axis of the shoe. The pin has a stepped cylindrical shape with a conical transition. The device increases reliability and lifetime of the casing reamer shoe due to the shape of the grooves and pins.

The device is designed for borehole reaming during casing—casing reamer shoes mounted in the conductor guide hole of a string or liner. The casing reamer shoe has a sub connected via a sleeve with a spiral mandrel having at least one screw groove, and a mandrel with a drill shoe located at one end thereof, and a pipe with at least one pin at the other end. The mandrel is mounted movably on the spiral mandrel inside a case being rigidly connected to the sub. The pin is arranged in the groove. The cross section of the screw groove has a shape of a trapezoid expanding in the direction of the longitudinal axis of the shoe. The pin has a stepped cylindrical shape with a conical transition. The device increases reliability and lifetime of the casing reamer shoe due to the shape of the grooves and pins.

A vibration damping device for use with downhole electronics may comprise: a device housing mechanically coupled to the downhole electronics and defining a receptacle; and an inertia element movably supported in the receptacle; wherein the volume of the receptacle is greater than the volume of the inertia element so as to define an interstitial volume therebetween and wherein the interstitial volume is occupied by a fluid or an elastomer. A method for tuning a downhole torsional damping device to match a desired downhole electronics may comprise a) calculating a set of natural frequencies and mode shapes for the downhole electronics, b) selecting a desired frequency from the calculated natural frequencies, c) tuning the damping device characteristics to match the selected frequency, d) using the mode shapes to place the damping device. The mode shapes may include antinodes and step d) includes positioning a damping device at an antinode.

A self-retracting coiled cable having a variable length along a center line can include an outer insulator sleeve having a longitudinal axis. The self-retracting coiled cable can also include a spring material extending along the longitudinal axis of the outer insulator sleeve. The spring material can hold the outer insulator sleeve in a helical shape around the center line. The spring material can also allow the self-retracting coiled cable to expand upon an application of an axial force to an end of the self-retracting coiled cable, thereby increasing a length of the self-retracting coiled cable, and to retract upon a removal of the axial force from the end of the self-retracting coiled cable, thereby reducing the length of the self-retracting coiled cable. The self-retracting coiled cable can further include multiple wires extending along the longitudinal axis of the outer insulator sleeve and disposed symmetrically around the spring material.

A system for facilitating the transmission of rotational torque through a tool when the tool is in tension but allowing free rotation without torque transmission when the tool is in compression and stroked partially or fully closed.

Various connection devices and assemblies, such as telescoping riser joints, can include at least one of the present connection devices. Some of the present connection devices, for example, include a housing having a bore therethrough; a locking ring rotatably movable relative to the housing between a first position and a second position; and an engagement member laterally moveable relative to the bore of the housing between a retracted position and an extended position. In some such connection devices, the locking ring is configured such that movement from the first position to the second position causes the engagement member to move from the retracted position to the extended position.

A well tool device may include a first subsection and a second subsection connected to each other. The first subsection comprises a first connector having an outwardly facing first connection interface and the second subsection comprises a second connector having an inwardly facing second connection interface, where the second connector is provided radially outside of the first connector. The first connection interface is facing towards the second connection interface. The first connection interface comprises a first recess provided in the first connector. The second connection interface comprises a second recess provided in the second connector. The first and second recesses together are forming a bolt compartment. The well tool device further comprises a locking bolt provided in the bolt compartment formed by the first and second recesses in order to connect the first and second subsections to each other. The bolt compartment formed by the first and second recesses has an opening in the outer surface of the second connector.

A dampener device configured for incorporation into a downhole tool in a drilling system for absorbing axial, lateral and torsional shocks and vibrations to protect instrumentation during a drilling process includes a main sleeve having a main cavity containing a main spring and a first elastomeric ribbon interleaved between coils of the main spring. An adapter is connected to or formed monolithically relative to the main sleeve. The adapter is configured for connection to a first tool component. A plunger is configured to compress the main spring and a connector is configured for connection to a second tool component. The connector is attached to or formed monolithically relative to the plunger. A shaft extends between the adapter and the connector. The shaft is provided with an anti-rotation structure.

A downhole tool has a main body that is cylindrical and includes a top coupling that couples to a drill string. A second body that is cylindrical is positioned at least partially within the main body. The second body has a bottom coupling that couples to a drill bit. Springs are positioned within the downhole tool and transmit an axial force to the drill bit. A first set of grooves is formed on an interior of the main body, and a second set of grooves is formed on an exterior of the second body. Balls travel within the first and second sets of grooves. At least some of the balls simultaneously engage the main body and the second body.

The invention provides a swivel tool for use in a wellbore. The tool comprises a tool body and a mandrel which is axially moveable relative to the tool body. The tool also comprises a lock member moveable between a first condition in which the mandrel is rotatably movable relative to tool body and a second condition in which the mandrel and a tool body are rotationally coupled. The lock member is configured to move between the first condition and second condition in response to a mechanical axial force and rotational force on the mandrel.