There is provided a rotating split tubing hanger, including: a mandrel having a bore therein and a mandrel exterior surface, the mandrel attachable to a tubing string; a housing sleeve mountable on the exterior surface of the mandrel, the mandrel being rotatable relative to the housing sleeve, and the housing sleeve comprising a housing sleeve exterior surface; and an outer sleeve removably mountable on the housing sleeve exterior surface, the outer sleeve comprising an outer sleeve exterior support surface engageable with a tubing head.

A drill string steering system includes a motor and a rotary valve body disposed in a tool body. The motor includes a motor shaft coupled to the motor and extending within a central bore of the tool body. The motor shaft has a downhole engagement portion that includes a first splined surface. The rotary valve body includes a disk-shaped component and a valve shaft coupled to the disk-shaped component and extending uphole of the disk-shaped component. The valve shaft includes a second splined surface engageable with the first splined surface for rotation of the motor shaft to be imparted to the rotary valve body.

The invention discloses an induced drilling method for inertial constraint implicated motion, which is characterized by comprising a motion step of separating weight on bit and torque. The induced drilling method of inertial constraint implicating motion comprises the following steps: step 1, model selection of induced drilling; step 2, potential energy storage of induced drilling, wherein step 2 includes: I, uniform cutting induced drilling under a steady condition; II, distribution of induced drilling shock wave propagation under a transient condition; III, potential energy release of torsion spring in induced drilling under the transient condition; IV, constrained buffer for induced drilling under transient conditions; and V, potential energy compensation for induced drilling under transient conditions. The invention also discloses an inertia constraint induced drilling device accompanying the PDC bit.

A ground drilling device comprising a housing, a lengthwise movable drilling head tip arranged in the housing, and a bearing for supporting the drilling head tip in the housing during its lengthwise movement.

The present disclosure is directed to improved downhole motor designs. In one illustrative embodiment, primary and secondary thrust bearings that are maintained in position by other structural components of the motor without compressive loading of the entire bearing assembly are positioned inside the motor housing for protection from cuttings and debris in the drilling fluid. In some illustrative embodiments, a drive train that features at least one multi-part sectional flex joint may allow for a shortened flex shaft while sufficiently converting eccentric forces from the power source to rotation of the mandrel.

An assembly including a seal adapter having a bearing retainer and a bearing, wherein the bearing retainer is cylindrical and has a bearing retainer inside surface and a bearing retainer outside surface, and wherein the bearing retainer comprises a cavity along the bearing retainer inside surface, and wherein the bearing is cylindrical, wherein the bearing has a bearing outside surface, a bearing inside surface, a bearing front surface and a bearing back surface, and wherein, when assembled, the bearing is at least partially within the cavity, such that the bearing outside surface and the bearing back surface are in contact with the bearing retainer inside surface.

A bearing assembly for a downhole mud motor has a transitional radial support in the form of a transitionally tapered bearing mandrel. The new radial support includes a generally cylindrical bearing housing having an upper end facing upstream in the direction of the drill string and a lower end, an outer cylindrical surface and an inner cylindrical surface, and wherein a portion of the inner cylindrical surface surrounds and contains a plurality of axial bearings. The bearing mandrel underlies the bearing housing and has an outer surface which defines a lower bearing region. The lower bearing region including a series of stepped outer diameter regions that also define a transitional reduction in cross-section area for the lower bearing region of the mandrel which, in turn, allows the bearing mandrel to have a progressive reduction in bending strength and to become a more active element in bending strength of the mud motor, instead of relying primarily upon the bearing housing.

An apparatus for use in a drill string configured for use in a subterranean formation includes a drive shaft coupled to a drill bit, the drill bit configured to continuously rotate and penetrate within the subterranean formation, a drill string housing that houses the drive shaft, the drive shaft continuously rotating within the drill string housing relative to the drill string housing, and a bearing assembly configured bear the drive shaft within the drill string housing, the bearing assembly comprising a first bearing surface having a first curvature.

A drill string rotation controller includes an anti-torque balance module, a TC bearing retaining ring, an upper TC bearing, an upper thrust ball bearing, an upper Haval ring, a middle seal retaining ring, an upper mandrel, an upper shell, a rotary control cylinder, an upper spring, a spline shell, a spline sleeve, a spline mandrel, a lower shell, a spring push sleeve, a lower spring, a floating piston, a lower mandrel, a bulkhead, a lower thrust ball bearing, a lower Haval ring, a lower TC bearing, a conversion joint, an anti-drop joint, a lower joint, and a control pin. The rotary control cylinder causes the spline sleeve to switch the transmission relationship between the spline mandrel and shell. Therefore, the drill string rotation controller controls the conversion between the composite drilling mode and the directional drilling mode.

Embodiments disclosed herein are directed to bearing assemblies, related bearing apparatuses, and related methods. An example of a bearing assembly disclosed herein may include a support structure having a first end and a second end. The bearing assembly also includes a superhard bearing element secured to the first end of the support structure. The superhard bearing element includes a superhard sealing surface that may be configured to contact a sealing surface of an opposing bearing element, a base surface contacting the support structure and opposing the superhard sealing surface, and at least one lateral surface extending between the superhard sealing surface and the base surface. The support structure and the superhard bearing element may both include at least one conduit extending therethrough through which a fluid may flow.