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| Number | Title | Issue Date |
| 7308940 | Flexible wellbore broach A method and apparatus for milling and/or broaching within a wellbore. A flexible broach runs into the wellbore and is located adjacent a portion of the wellbore to be broached. The broach reciprocates axially within the wellbore and removes at least part of the por... | 12/18/2007 |
| 7186182 | Drive line for down hole mud motor A drive line for a down hole mud motor has a plurality of elongate keys extending radially from an exterior surface of a central shaft for the purpose of transmitting torque. A plurality of circumferentially spaced axial keyways are provided in an interior surface o... | 03/06/2007 |
| 7182158 | Drilling device comprising a rotational drive In a drilling device with a drive unit for rotation and advance the rod assembly has a plurality of pipe sections interconnected by means of plug-type connections torque proof in both directions. A tension rod protrudes through the interior of the rod assembling. Th... | 02/27/2007 |
| 7165609 | Apparatus for handling tubular goods An apparatus for handling tubular goods which includes an elongate tubular body having a peripheral sidewall and opposed ends. The peripheral sidewall has a plurality of axial slots arranged circumferentially around the tubular body parallel to an axis of the tubula... | 01/23/2007 |
| 6997811 | Sealed flexible motor coupling A hermetic seal functions as a closure between opposite ends of the coupling by combining a metal sleeve and an elastomer sleeve extension. The metal sleeve is sealingly attached to the outer surface of one end of the coupling and the elastomer sleeve, sealingly att... | 02/14/2006 |
| 6949025 | Downhole motor universal joint assembly A downhole motor universal joint assembly includes a female coupler which receives a male end of a drive shaft. The female coupler has a retainer that prevents separation of the male end and the female coupler. The retainer has a rearward extending skirt with flow p... | 09/27/2005 |
| 6917176 | Gas main robotic inspection system The present invention provides a long-range, untethered, live, in-pipe inspection system that includes a self-propelled train having a plurality of modules; joint members for interconnecting adjacent modules, data collection components, and wireless communication co... | 07/12/2005 |
| 6915865 | Locking swivel apparatus with a supplemental internal locking mechanism A locking swivel apparatus is provided. The locking swivel includes an upper body portion having a counter bore about a cylindrical axis, a mandrel receivable in the counter bore, and a lower cap member threadably engaged with the upper body portion. The apparatus f... | 07/12/2005 |
| 6843332 | Three dimensional steerable system and method for steering bit to drill borehole A steering assembly includes upper and lower tubular housings connected by a universal joint. An angle cam is disposed on the end of the lower housing and projects into the upper housing. A plurality of wedge members extend axially from the upper housing and into en... | 01/18/2005 |
| 6598687 | Three dimensional steerable system A steering assembly includes upper and lower tubular housings connected by a universal joint. An angle cam is disposed on the end of the lower housing and projects into the upper housing. A plurality of wedge members extend axially from the upper housing ... | 07/29/2003 |
| 6378630 | Locking swivel device A locking swivel device is provided for connection with a proximal end of a drill string and for conducting a drilling fluid to the drill string. The device is comprised of a housing and a mandrel rotatably supported within the housing such that an annula... | 04/30/2002 |
| 6302797 | Flexible drill pipe In the invention a flexible drill pipe comprising a plurality of short tube sections assembled end to end. Each short tube section having the same number and type of saw tooth shaped gear teeth cut around the circumference of each end of the short tube se... | 10/16/2001 |
| 6059661 | Shaft alignment A rotary shaft assembly including a mechanism by which one part of the shaft rotates about a rotation axis which is controllably deviated from the rotation axis of the other part of the shaft. The angular extent of deviation is controllably varied by mutu... | 05/09/2000 |
| 5704838 | Down-hole motor universal joint A universal joint assembly (12) includes a coupling hub member (26) and a female coupling member (24). The female coupling member (24) includes a receptacle (28) at one end for receiving a pivot end (30) of the coupling hub member (26). The joint (12) inc... | 01/06/1998 |
| 5671816 | Swivel/tilting bit crown for earth-boring drills A drill bit for drilling subterranean formations includes a device to provide a "universal" effect between the shank and crown for self alignment of the crown with the bore hole in the formation. The bit is suitable for downhole assemblies configured for ... | 09/30/1997 |
| 5503236 | Swivel/tilting bit crown for earth-boring drills A drill bit for drilling subterranean formations includes a device to provide a "universal" effect between the shank and crown for self alignment of the crown with the bore hole in the formation. The bit is suitable for downhole assemblies configured for ... | 04/02/1996 |
| 5203595 | Dovetail-type coupling device and method A coupling device and method of coupling especially suitable for coupling multiple components of surgical instruments are provided. A wedging portion provides an interference fit between parts so that a secure connection can be made that will not unintent... | 04/20/1993 |
| 5007490 | Progressive cavity drive train with elastomeric joint assembly for use in downhole drilling A downhole drilling apparatus which includes a progressive cavity drive train comprising a progressive cavity device and a coupling for converting the complex motion of the rotor into simple rotation. The coupling includes two shafts coupled to one anothe... | 04/16/1991 |
| 5007491 | Downhole drilling apparatus progressive cavity drive train with sealed coupling A downhole drilling apparatus which includes a progressive cavity drive train having a progressive cavity device and a coupling for converting the complex motion of the rotor into simple rotation. The coupling is constructed along the lines of a double Ho... | 04/16/1991 |
| 4904228 | Universal ball joint An improved universal ball joint especially adapted to be used in the transmission of high torque, as in oil field use, includes a driving and driven shaft. One of the shafts, which may be the driving shaft includes a spherical ball received in a housing ... | 02/27/1990 |
| 4685895 | Stabilizer mechanism for use in drilling deviated well bores A stabilizing mechanism for guiding drill direction of a flexible drill string when drilling the straight portion of a deviated well bore. The stabilizing mechanism comprises a tubular mandrel adapted for connection between the flexible drill string and a... | 08/11/1987 |
| 4679638 | Downhole progressive cavity type drilling motor with flexible connecting rod A downhole motor has a rotor and a stator, of the progressive cavity type, inside a housing. A bearing shaft is mounted within the housing, with a bearing between the housing and the bearing shaft, and the bearing shaft is rotatable about the longitudinal... | 07/14/1987 |
| 4625815 | Drilling equipment, especially for use in underground mining The invention relates to a drilling equipment whose annular bit (4) for cutting the rock located in the deepest point of the drill hole is provided with high-pressure water-jet nozzles and is connected via a flexible high-pressure hose pipe (13) with a hi... | 12/02/1986 |
| 4575359 | Rotary drive coupling A heavy duty rotary drive coupling is suitable for use in drilling holes in subterranean formations. The coupling includes passages for delivering drilling fluids to and from the bottom of the drill hole, and yet is designed to accommodate axial misalignm... | 03/11/1986 |
| 4449953 | Articulated coupling An articulated coupling has two cylindrical half-couplings facing each other at their end faces. Recesses are formed in the end faces which recesses in which a cage is installed in the recesses with a clearance. Radial coaxial openings are formed in the c... | 05/22/1984 |
| 4368786 | Downhole drilling apparatus A downhole drilling apparatus for drilling holes at right angles to a vertical well hole which includes a tubular housing capable of being inserted in the well hole and containing at least one elbow tube or guide, and multiple tapered and splined, interlo... | 01/18/1983 |
| 4343369 | Apparatus for drilling straight portion of a deviated hole A guide for drilling a straight section of a bore hole deflected from the vertical. The apparatus comprises either a normally straight or a curved-straight tubular member which has a plurality of generally circumferential cuts disposed along the length of... | 08/10/1982 |
| 4290494 | Flexible shaft and roof drilling system A system for drilling holes in the roof of a mine has a flexible shaft with a pair of oppositely wound, coaxial flat bands. One of the flat bands defines an inner spring that is wound right handed into a helical configuration, adjacent convolutions being ... | 09/22/1981 |
| 4286676 | Crank connector for directional drilling This connector comprises two tubular members connected to each other, one of which can pivot about a rotation axis which forms an acute angle with the axis of the two members. This axis of rotation and the axes of the two members converge to the same poin... | 09/01/1981 |
| 4263788 | Universal joint apparatus having sliding plate construction for separating thrust and torque forces A universal joint is provided for transferring thrust and torque forces from a rotatable means for driving to a rotatable means to be driven. The joint has a pair of end housings each connected to a respective rotatable means at one end thereof and having... | 04/28/1981 |
| 4254638 | Positive release means for articulated flexible shaft A flexible shaft is formed of a plurality of linked sections which lock together to provide a rigid shaft when turned in a first direction as for drilling and which, when turned in the opposite direction, unlatch, thereby permitting limited relative movem... | 03/10/1981 |
| 4243112 | Vibrator-assisted well and mineral exploratory drilling, and drilling apparatus Well and exploratory drilling apparatus whose rotary motion is modified by a vibrator to provide lateral movement of its bit. There is also disclosed a universal movement which enables such action to occur in a steerable assembly, while providing a passag... | 01/06/1981 |
| 4236737 | Conduit swivel joint The invention pertains to high pressure conduit swivel joints capable of conducting fluid pressures of 6,000 psi wherein the associated conduit members of the joint are permitted angular deflection and relative rotational movement. An elastomer assembly i... | 12/02/1980 |
| 4233820 | Flexible drill pipe According to the invention a flexible drill pipe constructed of a closed pitch cylindrical spiral coil of wire rod, a female tool joint is attached to one end of the coil of wire rod and a male tool joint is attached to the other end. A plurality of wire ... | 11/18/1980 |
| 4226288 | Side hole drilling in boreholes Apparatus for use in a borehole or other restricted space to bore a side hole into the strata surrounding the borehole, including a flexible shaft with a drill at its end, and two trains of sheathing members that can be progressively locked together into ... | 10/07/1980 |
| 4157022 | Pressure compensating coupling for in hole motors A connecting rod assembly has universal joints at the ends of a connecting rod of tubular construction, the universal joints being lubricated by grease contained in the tubular rod and retained in the universal joints by flexible boots disposed about the ... | 06/05/1979 |
| 4149391 | Flexible drill pipe According to the invention a flexible drill pipe constructed of a closed pitch cylindrical spiral coil of wire rod, a female tool joint is attached to one end of the coil of wire rod and a male tool joint is attached to the other end. A plurality of wire ... | 04/17/1979 |
| 4062412 | Flexible shaft drilling system In an apparatus for drilling long holes in the surface of a rock bed for installation of roof bolts where the working distance perpendicular to the surface is limited, a flexible, segmented shaft drill string is fed along a curved path to a mechanism posi... | 12/13/1977 |
| 4031713 | Flexible drill pipe According to the invention a flexible drill pipe constructed of a closed pitch cylindrical spiral coil of wire rod with a floating core of tube sections constructed the same positioned end to end but not attached through the hollow center of the coil of w... | 06/28/1977 |
| 3958649 | Methods and mechanisms for drilling transversely in a well Two methods and four mechanisms are disclosed for drilling at right angles to a vertical well at any location or depth in the well. The drilling mechanisms each comprises a flexible spring biased telescopic fluid conduit having a turbodrill on the lower e... | 05/25/1976 |
