Abstract: A rotary bit for oil and gas well drilling has cutting elements set in a hard facing material which in turn is supported by a sintered steel section between the hard facing and the steel base of the bit.

Abstract: A rotary drill bit, particularly for deep-well drilling, comprising a body (1) having a gauge region, a cutting surface which is defined by projecting cutting members (4) supported at the outer periphery of the body on supporting members and nozzle passages (6 ) through which flushing liquid can flow, and in which at least some of the nozzle passages (6) comprise an outlet region which is directed towards the cutting members and which gives the jets of flushing liquid (10') emerging therefrom an alignment with at least one component facing in the direction of the drillings flowing off along the outer face of the body.

Abstract: In a core drilling apparatus wherein a core bit is driven by a hydraulically actuated Moineau type motor, control valve means are provided whereby drilling fluid can be directed through the core sleeve to remove debris from its interior, and, subsequently diverted outside of the core sleeve when drilling begins. Alternative constructions are shown whereby the flushing of the core sleeve can be accomplished with the motor drive in an inactive mode or in an operating mode.

Abstract: A cutting member for rotary drill bits consists of a carrier member with a supporting face which consists of two component supporting faces adjoining one another in wedge-shape forming a front edge, and applied to each of the two component supporting faces is a supporting member together with a cutting layer which occupies the whole area. The cutting member which is wedge-shaped in its contours develops high drilling performances particularly in comparatively soft ground formations and is considerably cheaper than known wedge-shaped cutting members and renders possible an extensive variability in the formation of the supporting members together with the cutting layers and their arrangement on the carrier member.

Abstract: In a Moineau type fluid motor one of the relatively rotatable elements is made of a deformable material, and axial movement of tapered surfaces within the element, caused by variation in the fluid pressure, causes adjustment of the sealing force in the motor in accordance with the fluid pressure level.

Abstract: Generator for production of electrical energy to supply consumers located inside a bore hole, in particular, consumers for detection, transmission and remote control, where the generator is located in a flushing space inside of a drill string through which flushing liquid flows, which includes a stator and a rotor having a radial slot arranged coaxially to the stator and whose rotor is coupled to a motor which is energized by the flushing liquid, characterized by the fact that the stator contains a generator armature and the rotor contains an exciter equipped with a permanent magnet, that said slot between stator and rotor is connected with said flushing space, where a connecting path is directed counter-current to or at an acute angle to the flushing current on the intake side in the region of a branch-off from said flushing space, and that the rotor is supported by means of unsealed, erosion and abrasion-resistant radial and axial bearings.

Abstract: A rotary boring bit for boreholes comprises a body provided on its outer periphery with cutting members (6) consisting of a cutting portion (8) and a supporting portion (7), each cutting member being formed as a segment of a sintered body (1) having a core (3) of cutting material encased by a shell (2).

Abstract: A cutting element for processing of rock, in particular, but also metal, comprising a support member of cemented carbide or the like hard material and a cutting member made of polycrystalline diamond or like superhard cutting material, said members together forming the cutting element, the cutting element being formed by a cutout of a blank comprising a core zone of the cutting material and an outer zone of the hard material surrounding said core zone in the form of a shell, at least at the periphery thereof. The cutting element typically forms a wedge-shaped section of the blank.

Abstract: Tool for drilling bore holes and earth formations in which a bit body matrix, including tungsten carbide, has a plurality of carriers secured thereto, to each of which a cutting element is secured by soldering, after the body matrix has been produced, to avoid subjecting the diamond material embodied in the cutting element to the high temperatures required to produce the matrix body, which would have deleterious effects on the diamond. Each carrier has great rigidity and is provided with a plane surface confronted by the plane back surface of the cutting element to provide a desired narrow solder gap between the cutting element and carrier of uniform width, into which the solder is deposited to adhere the cutting element and carrier together, with the load being transmitted directly from the cutter element to the rigid carrier.

Abstract: A progressing cavity fluid motor for driving a drill bit for deep drilling tools is described. Such a motor is mounted on a drill string and is powered by a fluid such as drilling mud. The pump includes a housing, a stator with female helical threads within the housing and a rotor with male helical threads mounted inside of the stator. The drill bit is connected to the rotor. In the present invention the rotor has a threaded surface which is formed of an elastically deformable sleeve supported by a carrier shaft. The sleeve is mounted on the carrier shaft in such a manner as to prevent rotation between the two so that the sleeve drives the shaft by positive engagement between these two elements. Means are arranged for introducing a pressure inside of the elastically deformable sleeve for expanding the sleeve radially outwardly.

Abstract: A shock absorber assembly has an outer body connectible at one end in a well drill string and an inner body connectible at one end in the well drilling string, with the bodies telescopically coengaged. Between the bodies is an annular space, filled with hydraulic fluid and containing a pressure equalizing annular piston. Stacked sets of dished-spring washers are disposed in coengaged frictional relation to form parallel-acting columns in the annular space between the two bodies. The equalizing piston is exposed to the pressure of drilling fluid inside the inner body, in one form, and outside the outer body, in another form. Another equalizing piston defines between the bodies a fluid filled chamber containing torque transmitting means for causing the bodies to rotate as a unit during drilling operations while allowing telescopic extension and retraction of the bodies. Telescoping of the bodies causes fluid transfer through restricted passages to dampen the telescopic motion.

Abstract: An apparatus for making-up and breaking a threaded connection between threaded tubular members, including a turnable chuck and a non-turnable chuck, each of which can be releasably clamped around its companion threaded tubular member, rotation of the turnable chuck in one direction making up the threaded connection, whereas rotation of the turnable chuck in the opposite direction breaking the threaded connection.

Abstract: Stabilizer apparatus for a rotary drill string, or other running string, including a body structure forming part of the rotary drill string and a stabilizer positioned on an end portion of the body structure, the stabilizer comprising a stabilizer sleeve having a conical interior surface shrink-fitted onto a mating external conical surface of the body structure by fluid pressure actuated or hydraulic means, permitting a safe, strong interconnection between the stabilizer and the drill string body structure. The stabilizer can be readily removed when necessary and replaced with another stabilizer similarly shrink-fitted onto the drill string body structure. The lower end of the stabilizer is internally upset and is received in an annular groove in the body structure, or under the lower end of the body structure, providing a large contact area between the stabilizer and a device threaded on the body structure which engages the lower end of the stabilizer.

Abstract: A tool joint for well drilling pipe includes a body having a wear protector including a split ring disposed in an annular groove in the tool joint body, the ring segments being welded together and to the groove portion of the body. Hardmetal elements secured in the outer periphery of the ring are irregularly distributed, with the distribution or density of the hardmetal elements being greatest adjacent to the end of the tool joint body and progressively less inwardly from the end of the tool joint body.

Abstract: Sleeve apparatus for mounting on a cylindrical periphery of a drill string, or other running string, including an inner sleeve having cylindrical interior and a conical exterior disposable at any selected location along a drill string member, an outer sleeve being mounted on the inner sleeve and having an inner conical surface companion to the outer conical surface of the inner sleeve, the outer sleeve being shrink-fitted on the inner sleeve, and the latter on the cylindrical periphery of the drill string member by fluid pressure actuated hydraulic means, permitting a safe, strong interconnection between the outer sleeve, inner sleeve and the drill string member, the inner and outer sleeves being readily removable, when necessary, for relocation on the drill string or for replacement by another inner and outer sleeve combination similarly shrink-fitted onto the drill string. The outer sleeve, positioned on the drill string, may be a stabilizer sleeve, a wear protection sleeve, a reamer, and the like.