| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 04/29/1987 | CN85204565U Pneumatic impacter of composite air orifice |
| 04/28/1987 | US4660658 Hydraulic down-the-hole rock drill |
| 04/28/1987 | CA1221086A1 Helical down-hole machine |
| 04/14/1987 | US4657090 Tapered friction bearing assembly |
| 04/09/1987 | DE3534661A1 Drilling head, in particular for a horizontal drilling appliance |
| 04/08/1987 | CN85107194A Drilling method by means of diving hole hammer driven by supercharging machine |
| 04/01/1987 | EP0216100A2 Boring ram with a piston-actuated percussion cutter |
| 04/01/1987 | CN86106885A Air pressure impact drilling method and apparatus for same |
| 03/31/1987 | US4653593 Control method and control device for a down-the-hole rock drill |
| 03/24/1987 | US4651837 Downhole retrievable drill bit |
| 03/24/1987 | CA1219577A1 Rotating boring tool with percussion device |
| 03/12/1987 | WO1987001413A1 Downhole hammer |
| 03/12/1987 | DE3541283A1 Mechanical seal |
| 03/10/1987 | US4648746 Pipe laying and replacement |
| 03/03/1987 | US4646856 Downhole motor assembly |
| 03/03/1987 | US4646836 Tertiary recovery method using inverted deviated holes |
| 02/24/1987 | US4646277 Control for guiding a boring tool |
| 02/19/1987 | DE3528278A1 Drilling apparatus for shafts |
| 02/19/1987 | DE3528277A1 Anchor drilling apparatus for shafts |
| 02/12/1987 | DE3631424A1 Method of disposing of harmful substances with simultaneous energy generation |
| 02/10/1987 | CA1217805A Method of distributing load among stacked bearings |
| 02/04/1987 | EP0210735A2 Improvements in or relating to drilling apparatus |
| 01/29/1987 | WO1987000571A1 Screw machine |
| 01/21/1987 | EP0209310A2 Axial balancing device for downhole drilling motors |
| 01/20/1987 | US4637476 Percussive action machine for making holes in the ground |
| 01/17/1987 | CN85102035A Drilling tool with two styles of slagging |
| 01/13/1987 | US4636151 Downhole progressive cavity type drilling motor with flexible connecting rod |
| 01/06/1987 | US4633958 Downhole fluid supercharger |
| 01/02/1987 | DE3531237C1 Sealed connection |
| 12/30/1986 | US4632193 In-hole motor with bit clutch and circulation sub |
| 12/30/1986 | US4632191 Steering system for percussion boring tools |
| 12/16/1986 | US4629013 Drive device for a drill bit |
| 12/16/1986 | US4629010 Process and device for sinking wells |
| 12/16/1986 | US4629008 Reversible percussive action machine |
| 12/10/1986 | EP0204243A2 Rock Drills |
| 12/09/1986 | US4627501 Borer head with planetary gearing |
| 12/03/1986 | CN86102188A Trench excavator |
| 11/20/1986 | EP0202013A2 Steering and control system for percussion boring tools |
| 11/11/1986 | US4621698 Percussion boring tool |
| 11/06/1986 | WO1986006443A1 Downhole screw motor |
| 11/04/1986 | US4620601 Well drilling tool with diamond thrust bearings |
| 10/28/1986 | US4619334 Joint device in extension drill equipment for percussive drilling |
| 10/22/1986 | EP0198112A1 Thrust bearing for direct bit drives of well drilling tools |
| 10/21/1986 | US4618008 Vertical drilling method and apparatus |
| 10/21/1986 | US4618007 Impact-action self-propelled mechanism for driving holes in the earth |
| 10/14/1986 | US4616719 For overcoming a resistance to advance of a pipe string in a well bore |
| 10/08/1986 | EP0196991A1 Downhole drilling motor |
| 10/07/1986 | US4615401 Automatic hydraulic thruster |
| 10/07/1986 | US4615400 Sonic drilling system employing spherical drill bit |
| 09/30/1986 | CA1212098A1 Down-hole motor and method for directional drilling of boreholes |
| 09/24/1986 | EP0195265A1 Tool for undercutting bore holes |
| 09/23/1986 | US4613003 Apparatus for excavating bore holes in rock |
| 09/23/1986 | US4613002 Downhole drilling tool with improved swivel |
| 09/23/1986 | US4612987 For absorbing reaction torque from a downhole mud motor |
| 09/10/1986 | EP0193618A1 Apparatus and method for assembling and matching the working components of a sectional screw downhole motor |
| 09/09/1986 | US4610307 Method and apparatus for selectively straight or directional drilling in subsurface rock formation |
| 09/03/1986 | CN85101970A Jet-suck impactor |
| 09/02/1986 | US4609052 Pneumatically operated burrowing tool |
| 08/19/1986 | US4606700 Turbodrill multistage turbine |
| 08/19/1986 | US4606417 Pressure equalized stabilizer apparatus for drill string |
| 08/12/1986 | US4605076 Method for forming boreholes |
| 08/12/1986 | CA1209569A1 Intermittently rotatable down hole drilling tool, thrust bearing for use therein and method of assembly of such thrust bearing |
| 08/05/1986 | US4604106 Composite polycrystalline diamond compact |
| 07/23/1986 | CN85108426A Reversible underground piercing device |
| 07/22/1986 | CA1208198A1 Precussion actuated core sampler |
| 06/24/1986 | US4596292 Subsoil penetrating apparatus |
| 06/11/1986 | EP0184304A1 Method and system of drilling deviated wellbores |
| 06/10/1986 | US4593774 Downhole bearing assembly |
| 06/10/1986 | US4593772 Rotary cutter for cable following apparatus |
| 06/10/1986 | CA1205796A1 Down-hole motor and method for directional drilling of boreholes |
| 06/03/1986 | US4592432 Automatically operated boring head |
| 06/03/1986 | CA1205456A1 Rotating double barrel core sampler |
| 05/27/1986 | US4591004 Pneumatic percussion machine |
| 05/21/1986 | EP0181712A1 Reversible underground piercing device |
| 05/21/1986 | EP0181326A1 Improvement to hole bottom hammers for ground drilling |
| 05/06/1986 | CA1204004A1 Tool, particularly a boring tool |
| 04/29/1986 | US4585401 Multistage helical down-hole machine with frictional coupling of working elements, and method therefor |
| 04/29/1986 | CA1203728A1 Rock drills |
| 04/22/1986 | US4583601 Hammer drill |
| 04/02/1986 | CN85202387U Fluid operated hammer for the use of oil rotary drilling |
| 03/26/1986 | EP0174972A1 Hammer for use in a bore hole and apparatus for use therewith. |
| 03/25/1986 | US4577704 Bearing system for a downhole motor |
| 03/25/1986 | US4577547 Impact tool |
| 03/18/1986 | US4576229 Device for facilitating release of stuck drill collars |
| 03/18/1986 | CA1201946A1 Hydraulic down-the-hole rock drill |
| 03/12/1986 | EP0173922A1 Joint device in extension drill equipment for percussive drilling |
| 03/04/1986 | CA1201428A1 Method and means for transmitting data through a drill string in a borehole |
| 02/26/1986 | EP0172452A1 Apparatus for transmitting information from a well to the surface during drilling |
| 02/18/1986 | US4571122 Pipe laying apparatus |
| 02/18/1986 | US4570723 Machine for driving holes in the ground |
| 02/13/1986 | WO1986000954A1 Sectional screw downhole motor, method of its assembling and mounting device therefor |
| 02/12/1986 | EP0171374A1 Hydraulic down-the-hole rock drill |
| 02/11/1986 | US4569412 Seismic source |
| 02/04/1986 | US4567953 Bottom-hole multistart screw motor |
| 01/22/1986 | EP0169081A2 Composite polycristalline diamond |
| 01/16/1986 | WO1986000357A1 Pneumatic reversible percussion device |
| 01/15/1986 | EP0168368A1 Control method and control device for a down-the-hole rock drill |
| 01/15/1986 | EP0096037B1 Hydraulic down-the-hole rock drill |
| 01/08/1986 | EP0167090A2 Cutting wheel apparatus for excavating cut-off trenches |
| 12/31/1985 | US4562560 Method and means for transmitting data through a drill string in a borehole |