Abstract: A base powder mixture consisting of diamond material and solid support is inserted into the recess of a mold block for the manufacture of cutting elements for, in particular, deep drill bits, the mold block is then externally hermetically enclosed and hot isostatically pressed. The base powder mixture is, first of all, inserted directly into the recess, the mold block is then enclosed as a whole in a capsule and placed in a high pressure furnace in which pressure is applied to the mold block by a liquid or gaseous pressure medium and, finally, after cooling and lowering of the pressure, the capsule is removed and the finished cutting elements are taken out of the recess.

Abstract: The flow of drilling fluid across the face of a rotating bit can be improved by disposition of jet nozzles in the middle of pads defined on the rotating bit rather than in or directly communicating with water courses in the bit. Drilling fluid is therefore ejected by the nozzle and flows in a plurality of directions across the face of the pad with a maximal velocity. Drilling fluid arriving in the proximity of the nozzle and provided from other sources in the bit is thus entrained within the drilling fluid which is ejected from the nozzle. This serves then to suction drilling fluid from these other sources. In particular, in a rotating bit having a pilot bit and main reamer bit, drilling fluid supplied to the pilot bit is directed toward a pilot bit junk slot in the immediate proximity of a nozzle disposed in the middle of a reamer lobe. Drilling fluid flowing down the pilot bit junk slot is entrained within drilling fluid ejected by the reamer nozzle.

Abstract: A tool, provided in the form of an up-drill sub, is comprised of a cylindrical body having a plurality of lobes integrally formed therewith and radially extending therefrom. Each lobe in turn is provided with a plurality of diamond cutting elements on an upwardly inclined surface of the lobe. The lobes are separated by channels or junk slots. The diamond cutting elements are arranged and configured on the sloping surface of the lobe to provide a cutting or reaming action as the tool is rotated and drawn upwardly in the bore. Tungsten carbide inserts are also provided on the circumferential gage surfaces of the lobes to provide gage protection. The ends of the sub are provided with selected pin or box connections in combination as appropriate so that the up-drill sub can be used anywhere within the drill string. Therefore, the up-drill sub may be used near the bit as a near bit or elsewhere in the drill string, such as a crossover sub between the drill collar and drill pipe or above a stabilizer.

Abstract: An improved coring device that incorporates a nonrotatable inner barrel disposed within the outer driving structure of the drill string which is coupled to a coring bit. A woven metal mesh sleeve is circumferentially mounted outside the inner barrel and tucked around its lower end. The lower end of the mesh sleeve in the inner barrel is in turn connected to a stripper tube which is pulled upwardly during the coring operation. As the core is cut by the coring bit and enters the inner barrel, the woven metal mesh sleeve is disposed about the core and constricts about the core when pulled upwardly by the stripper tube. The opposing end of the woven metal mesh sleeve is connected to a weight which serves to compress the metal sleeve when outside the inner barrel, thereby increasing its diameter to prevent binding or jamming.

Abstract: An improved coring device that incorporates a nonrotatable inner barrel disposed within the outer driving structure of the drill string which is coupled to a coring bit. A woven metal mesh sleeve is circumferentially mounted outside the inner barrel and tucked around its lower end. The lower end of the mesh sleeve in the inner barrel is in turn connected to a stripper tube which is pulled upwardly during the coring operation. As the core is cut by the coring bit and enters the inner barrel, the woven metal mesh sleeve is disposed about the core and constricts about the core when pulled upwardly by the stripper tube. The opposing end of the woven metal mesh sleeve is connected to a weight which serves to compress the metal sleeve when outside the inner barrel, thereby increasing its diameter to prevent binding or jamming.

Abstract: A rotating bit, particularly a rotary bit, is provided with a plurality of teeth incorporating diamond cutting elements of a first and second type. Each type of tooth is particularly adapted to cut a particular type of rock formation. For example, the plurality of the first type of teeth are particularly designed to cut soft to medium-hard rock formations, and the plurality of the second type of teeth are particularly adapted to cut hard or abrasive rock formations. In one embodiment, the first type of teeth are set on the bit face to have a greater exposure from the bit face than the second type of teeth. In that case, the first type of teeth will engage the rock formation first. A second embodiment has the relative disposition of the first and second types of teeth as measured by their disposition from the axis of rotation on the bit reversed.

Abstract: A polycrystalline diamond cutting element in an earth boring bit is affixed to the bit face by an improved tooth. The tooth includes a prepad extending from the face of the mining bit contiguous to and substantially congruous with that portion of a polycrystalline diamond element also extending from the bit face. A trailing support is provided behind the polycrystalline diamond element and is similarly contiguous and substantially congruous therewith so that a generally singular geometrically shaped body is formed by the prepad, the polycrystalline diamond element and the trailing support. The prepad and trailing support are integrally formed from the matrix material of the rotary bit and are generally arcuate about a radius centered on the bit face. The polycrystalline diamond element is thus securely retained on the bit face while exposing a maximum extent of the polycrystalline diamond element sandwiched between the prepad and trailing support.

Abstract: An apparatus for the remote transmission of information from a borehole (1) to the surface of the earth is disposed in a drilling pipe string (4) of a drilling device. The drilling device further comprises a rotary drill bit (3) and a pump (5) which pumps the flushing liquid (6) downwards in the flow passage (11) of the drilling pipe string, through the rotary drill bit (3) and upwards in an annular space (7) surrounding the pipe string. The apparatus has devices for ascertaining information data (8), for converting the information data into electrical control signals (9) and for producing pressure pulses (10) in the downwardly directed flow of the flushing liquid (6). The devices are disposed in a chamber (13) which is bounded internally by the flow passage (11) and externally by an outer tube (12).

Abstract: Cutting elements, for example of polycrystalline sintered diamond, the cutting faces of which are set differently to the cutting direction, are disposed on a rotary drill bit. One group of cutting elements has its cutting faces substantially perpendicular to the cutting direction (straight set cutting elements) while other groups of cutting elements are at an acute angle to the cutting direction (obliquely set cutting elements).Because of their greater pressure per unit area, the obliquely set cutting elements penetrate more easily into plastic formations and can tear these up. The straight set cutting elements, which do not develop a great pressure per unit area, but work over a wider range, can better pare off the formation prepared by the obliquely set cutting elements.

Abstract: A device for the remote control of data out of a drill hole to the earth surface during the operation of a drilling device which comprises a drill bit, a drill string and a pump raising a flushing liquid into the surrounding annular space of the drill hole and downward into flow channels of the drill string, consisting of devices arranged in the drill string for the ascertaining of desired informational data for the conversion of the informational data into a series of electrical control signals for the producing of pressure pulses in the downward directed flow of the flushing liquid as a function of the control signals and for the production of the necessary electrical energy, characterized in such a way that the devices part of a coaxial support within the flow channels of the drill string form a structural unit and are arranged over each other; separated axial sections of the structural unit are grouped and that at least the topmost section of the structural unit is constructed as an independent component

Abstract: Adjustable torsional type latching means (5) for triggering a mechanical well jar tool comprises torsionally actuated gear racks (20,22) including acme threads or teeth which extend axially on opposite adjacent side portions of telescopic parts (1,2). The gear rack teeth which mesh in the latched position have incline tooth faces that can be disengaged by applying a strong axial force which torsionally stresses and rotates a torsion sleeve (16) portion of one telescoping part (1) and gear rack (20) thereon away from the other part (2) and gear rack (22). Upon release of the latching device (5) the telescopic parts (1,2) of the well jar and the kinetic energy stored therein are freed for a limited longitudinal jarring movement. The torsion sleeve portion (16) has an end portion connected to the other telescopic parts by a second slot-spline-gear (15) of relative short axial length, which serves as a torque support in the latched position and becomes deengaged during a jarring stroke.

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: 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 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: 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: A self powered downhole tool anchor device (10) preattached to a downhole tool (T) and unitarily supported by a drill string (DS) for a single trip into a well bore, actuated by forceful engagement with the bottom or plug (P) in the well bore and attachment to a well bore casing (C). The anchor device comprises an inner mandrel (20) and lower cone (34) containing a piston (30) and fluid (F) for axially displacing an outer mandrel and piston (44) connected thereto by shear screws (46). An upper cone (20) on the outer mandrel is connected by shear pins to a slip housing (50) containing radially expandable slips (38) keyed to the lower cone (34).

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: 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: A multi position safety valve retainable within an internal portion of a drill string casing (s) and responsive to the greater differential pressure in an internal fluid passage to displace a valve head (32) relative to a valve seat (VS) from its normal partially open position to either a wide open or a closed position. The valve head (32) is attached to a valve stem (30) that extends through a valve chamber and slideably mounted in opposite closed ends of a valve body and returnable to and maintained in the partially open position by opposing compression springs (34) (36) situated between opposite ends (22) of the valve body (VB) and one side of an intermediate abutment (30c) of the valve stem (30) and an intervening disc (38) on the opposite side thereof. The disc 38 is moveable into and out of seating engagement with an intermediate stop (20a) by one spring (34) and the intermediate abutment (30c) of the valve stem respectively.

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).