In accordance with presently disclosed embodiments, a system and method for rotationally orienting two wellbore tool components on a tool string relative to each other is provided. The system may include an alignment sub that is simple to operate and allows for quick adjustments to the relative orientations of downhole tool components. The disclosed alignment sub may include a first tubular component on one side and a second tubular component on the other side, and these tubular components are coupled together. The disclosed alignment sub utilizes an axially deformable and variable length sleeve attached to the first tubular component and adjacent to a tip of the second tubular component. The sleeve may provide an appropriate standoff distance between the opposing tubular components while enabling the components to be rotated relative to each other up to at least one full rotation about an axis of the alignment sub.

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.

Systems and methods for damping torsional oscillations of downhole systems are described. The systems include a damping system configured on the downhole system. The damping system includes a first element and a second element in frictional contact with the first element. The second element moves relative to the first element with a velocity that is a sum of a periodic velocity fluctuation having an amplitude and a mean velocity, wherein the mean velocity is lower than the amplitude of the periodic velocity fluctuation.

A device for transferring torque to a drill bit in a borehole having a borehole axis includes a support element configured to rotate in the borehole about the borehole axis, a torque transferring element configured to transfer torque from the support element to the drill bit and further configured to isolate torsional oscillations that are created at the drill bit from the support element, a blocking element configured to block rotation of the torque transferring element relative to the support element about the borehole axis in at least one direction, and a bearing element between the support element and the drill bit.

A dampener device is configured for incorporation into a downhole measurement tool in a drilling system, for absorbing axial, lateral and torsional shocks and vibrations to protect measurement instrumentation located above the device during drilling. The device includes: a main sleeve having a main cavity containing a main spring; an adapter connected to or formed monolithically relative to the main sleeve, the adapter configured for connection to a first tool component; a plunger configured to compress the main spring; a connector configured for connection to a second tool component, the connector attached to or formed monolithically relative to the plunger; a shaft extending between the adapter and the connector, the shaft provided with an anti-rotation structure; and one or more passages leading from the outside of the device into the main cavity. The passages are provided to allow drilling fluid to enter the main cavity to act as vibration dampening fluid.

A downhole assembly to mitigate high frequency torsional oscillation, in particular the high frequency torsional oscillation which can occur in a drilling operation for geothermal energy or for oil and gas. The downhole assembly has a rotary steerable tool and a high frequency torsional oscillation mitigation tool, the high frequency torsional oscillation mitigation tool having a one-way coupling, the high frequency torsional oscillation mitigation tool being located above the rotary steerable tool. Also relates to an oscillation mitigation tool suitable for use in a downhole assembly.

This invention relates to a torque control device for a downhole drilling assembly, the torque control device being adapted for connection to a drill bit. The torque control device includes an outer sleeve and an inner shaft, the outer sleeve being movable longitudinally relative to the inner shaft. The torque control device has a cylinder, a piston located within the cylinder, and a rotary valve to control the volume of the cylinder. The volume of the cylinder can be changed by way of the rotary valve whereby to adjust the weight on bit and thereby control the torque upon the drill bit.

A rotary glide system for a downhole tool includes a shaft having a plurality of helical grooves formed into an outer surface of the shaft, and a ball bearing sleeve configured to fit around the shaft. The ball bearing sleeve includes a plurality of helical grooves formed into an inner surface of the sleeve, a first slot that extends from a first end of the ball bearing sleeve and intersects a helical groove of the plurality of helical grooves, and a first ball stop comprising a first tab that extends into the first slot of the ball bearing sleeve.

Embodiments of a reciprocating tool, used to engage and clear obstructions in a wellbore, have a biasing spring located externally about an axially reciprocating and rotatable sleeve to act between the rotatable sleeve and the non-rotatable mandrel to bias the rotatable sleeve to an extended position. During a drill out operation, a non-rotatable sleeve, connected to the mandrel for telescoping over the mandrel and the rotatable sleeve during a downstroke of the mandrel, guides a drill string for drill-out of at least the mandrel and other internal components. Positioning the biasing spring external to the rotating sleeve and downhole of the non-rotating sleeve prevents engaging the spring with the drill string. The rotating sleeve provides an internal guide for the drill out string to further avoid engagement with the spring.

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.