| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
|---|
| 08/18/1981 | US4284136 Positioning deflection wedges |
| 08/18/1981 | US4284110 Apparatus for transfer of fluent materials from one container to another |
| 08/12/1981 | EP0033654A2 Rotary drill bits and method of use |
| 08/11/1981 | US4282940 Apparatus for perforating oil and gas wells |
| 08/11/1981 | CA1106833A1 Earth boring apparatus |
| 08/05/1981 | EP0032924A1 Percussion drilling rig |
| 08/04/1981 | US4281723 Control system for a drilling apparatus |
| 07/28/1981 | US4280569 Fluid flow restrictor valve for a drill hole coring tool |
| 07/15/1981 | EP0031818A1 Methods and arrangements for casing a borehole |
| 07/14/1981 | US4278137 Apparatus for extracting minerals through a borehole |
| 07/07/1981 | US4276942 Deviation device |
| 07/07/1981 | CA1104492A1 No translation available |
| 07/07/1981 | CA1104490A1 Riser tensioner system |
| 07/07/1981 | CA1104419A1 Artic drilling and production platform vehicle |
| 07/01/1981 | EP0030975A1 Hydraulic motor for a drill hole coring tool and method |
| 06/30/1981 | US4275935 Drilling stabilizer |
| 06/30/1981 | US4275794 Tool equipped with a percussive device |
| 06/23/1981 | US4274675 Shaft-sinking apparatus with milling head and central worm conveyor |
| 06/23/1981 | US4274496 Method and device in earth cutting |
| 06/23/1981 | US4274494 Method and device for setting the direction and/or the inclination of an elongated rock drilling apparatus |
| 06/16/1981 | US4273471 Marine-drilling sub-base assembly for a soft-bottom foundation |
| 06/16/1981 | US4273199 Torquer/thruster |
| 06/16/1981 | US4273193 Process for use in degasification of subterranean mineral deposits |
| 06/16/1981 | CA1103233A1 Drill boom arrangement |
| 06/16/1981 | CA1103115A1 Directional valve means for positioning machine units |
| 06/09/1981 | US4272059 Riser tensioner system |
| 06/09/1981 | US4271915 Elastically vibratory longitudinal jacketed drill |
| 06/03/1981 | EP0029449A1 Variable angle directional drilling sub |
| 06/02/1981 | US4270619 Downhole stabilizing tool with actuator assembly and method for using same |
| 06/02/1981 | US4270618 Earth boring apparatus |
| 05/26/1981 | CA1101835A1 Drill boom arrangement |
| 05/26/1981 | CA1101834A1 Drill boom arrangement |
| 05/26/1981 | CA1101833A1 Drill boom arrangement |
| 05/19/1981 | US4267892 Positioning control system for rock drill support apparatus |
| 05/19/1981 | CA1101408A1 Rock drill |
| 05/19/1981 | CA1101405A1 Support and positioner for a rock drill |
| 05/15/1981 | EP0030975A4 Hydraulic motor for a drill hole coring tool and method. |
| 05/12/1981 | US4266749 Drill boom arrangement |
| 05/12/1981 | US4266621 Well casing window mill |
| 05/12/1981 | US4266619 Down hole cycloidal drill drive |
| 05/12/1981 | US4266609 Method of extracting liquid and gaseous fuel from oil shale and tar sand |
| 05/12/1981 | CA1100938A2 Subsea drilling template with carousel guidance system |
| 05/06/1981 | EP0028121A1 Improvements relating to downhole shearers |
| 05/05/1981 | US4266171 Advance control system for use in a drilling apparatus |
| 05/05/1981 | CA1100555A1 Method of making high velocity liquid jet |
| 04/30/1981 | WO1981001168A1 Monitoring equipment for drilling operations |
| 04/29/1981 | EP0027784A1 A device for breaking a hard material |
| 04/28/1981 | US4264051 Laterally adjustable multiple head |
| 04/28/1981 | US4263975 Device for high-speed boring of stepped post-holes |
| 04/28/1981 | CA1100126A1 Cavitating liquid jet assisted drill bit and method for deep-hole drilling |
| 04/21/1981 | US4262758 Borehole angle control by gage corner removal from mechanical devices associated with drill bit and drill string |
| 04/21/1981 | US4262757 Cavitating liquid jet assisted drill bit and method for deep-hole drilling |
| 04/15/1981 | EP0026976A1 Method of and apparatus for restoring the diameter of plastic pipes located in an earth encompassing situ |
| 04/15/1981 | EP0026942A1 Drill boom for drilling machines |
| 04/14/1981 | US4261425 Mechanically nutating drill driven by orbiting mass oscillator |
| 04/07/1981 | CA1098895A1 Earth boring tool |
| 03/31/1981 | US4258805 Low cutter load raise head |
| 03/31/1981 | US4258800 Hinged conductor casing for deviated driving and method therefor |
| 03/31/1981 | US4258796 Earth drilling apparatus |
| 03/17/1981 | US4256190 Sonically assisted lubrication of journal bearings |
| 03/17/1981 | US4256188 Method and apparatus for drilling a hole in a body of ice and for the destruction of a body of ice |
| 03/17/1981 | US4256186 Roof drilling and bolting apparatus |
| 03/10/1981 | US4255068 Method and a device for undersea drilling |
| 03/10/1981 | US4254638 Positive release means for articulated flexible shaft |
| 03/10/1981 | CA1097330A1 Method and apparatus for driving pipe |
| 03/10/1981 | CA1097329A1 Drilling method and apparatus for large diameter pipe |
| 03/03/1981 | US4253531 Self-balancing vibratory drill apparatus |
| 02/24/1981 | US4252200 Sampling device |
| 02/19/1981 | WO1981000427A1 Percussion drilling rig |
| 02/17/1981 | US4251046 Extensible beam arrangement |
| 02/17/1981 | US4250972 Pneumatic ram boring device |
| 02/10/1981 | US4249620 Method of boring holes which are open at both ends in the ground |
| 02/10/1981 | US4249619 Deviated drilling apparatus |
| 02/10/1981 | CA1095504A1 Self-cleaning raise boring head system |
| 02/10/1981 | CA1095402A1 Marine riser system with dual purpose lift and heave compensator mechanism |
| 02/03/1981 | US4248314 Shaft drill bit with overlapping cutter arrangement |
| 02/03/1981 | US4248312 Method and apparatus for upwardly cutting full cutting face of a shaft without requesting workmen's hands |
| 02/03/1981 | CA1095093A1 Method and device for breaking a hard compact material |
| 02/03/1981 | CA1094831A1 Rock bolting apparatus |
| 01/27/1981 | US4247081 Front mounted brace for an underground pipe installing device |
| 01/27/1981 | US4246975 Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking |
| 01/27/1981 | CA1094541A1 Rock drill boom structure |
| 01/27/1981 | CA1094397A1 Warm air canopy system for providing ice free zone |
| 01/22/1981 | WO1981000132A1 Methods and arrangements for casing a borehole |
| 01/22/1981 | WO1981000124A1 Reversible percussive action device |
| 01/20/1981 | CA1094048A1 Suction jet drilling tool |
| 01/13/1981 | US4244663 Apparatus for restricting pipe motion |
| 01/13/1981 | US4244521 Arrangement for discharging liquid medium under high pressure |
| 01/13/1981 | US4244433 Safety mechanism for a raise drill |
| 01/13/1981 | US4244431 Drilling apparatus with dual drill pipe and cross-over |
| 01/13/1981 | CA1093459A1 Well perforating tool |
| 01/08/1981 | WO1981000018A1 Hydraulic motor for a drill hole coring tool and method |
| 01/08/1981 | WO1981000017A1 Apparatus and method for drilling into the sidewall of a drill hole |
| 01/08/1981 | WO1981000016A1 Fluid flow restrictor valve for a drill hole coring tool and method |
| 01/07/1981 | EP0021702A1 Installation of tunnel linings |
| 01/07/1981 | EP0020824A1 Push drill guidance system |
| 01/07/1981 | EP0020779A1 Earth auger |
| 01/06/1981 | US4243112 Vibrator-assisted well and mineral exploratory drilling, and drilling apparatus |
| 01/06/1981 | CA1093131A1 Electrode well for electrically heating a subterranean formation |
| 12/30/1980 | US4241799 Protected cutter mounting for drill bits |