| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
|---|
| 03/05/1992 | CA2087539A1 Method and apparatus for jet cutting |
| 03/03/1992 | US5092411 Drilling apparatus |
| 02/26/1992 | EP0280705B1 Process and device for producing drilling holes from an angled position in relation to the drilling axes |
| 02/25/1992 | US5090496 Down-hole bent motor housings |
| 02/25/1992 | US5090487 Drill head with integral impact hammers |
| 02/25/1992 | US5090486 Multi-purpose earth drill |
| 02/25/1992 | US5090485 Pile driving using a hydraulic actuator |
| 02/25/1992 | CA1296320C Mining process and apparatus |
| 02/20/1992 | WO1992002709A1 Controlled fracture method and apparatus for breaking hard compact rock and concrete materials |
| 02/20/1992 | DE4132656A1 Method for well boring - involves using tube well as borehole liners |
| 02/19/1992 | EP0471065A1 Self propelled probe, particularly for penetrating a powdered material |
| 02/19/1992 | CN2096627U Controllor for well deflection |
| 02/18/1992 | US5088917 Gas electroburner with electric power supply and assisted ignition |
| 02/18/1992 | US5088568 Hydro-mechanical device for underground drilling |
| 02/12/1992 | EP0269653B1 Apparatus for correcting irregularities in or enlarging an underground duct |
| 02/11/1992 | US5086854 Drill pipes for rotary-vibratory drills |
| 02/11/1992 | US5086850 Well bore drilling direction changing method |
| 02/11/1992 | CA1295605C Drill tool |
| 02/05/1992 | EP0469427A1 Sampling device |
| 02/05/1992 | EP0469317A2 Method and device for modifying the weight on an earth frill bit |
| 02/05/1992 | EP0349610B1 Device for drilling essentially vertical boreholes |
| 02/05/1992 | CN1058446A Mechanical sinking method for drilling agricultral well and sinking apparatus |
| 02/04/1992 | US5085283 Method and tool string for curving a vertical borehole horizontally |
| 02/04/1992 | CA1295136C Soil displacement hammer |
| 02/01/1992 | CA2047588A1 Hydraulically set anchor for well tools |
| 01/29/1992 | EP0468664A2 Method and apparatus for enlarging an underground path |
| 01/27/1992 | CA2047910A1 Method and apparatus for enlarging an underground path |
| 01/23/1992 | WO1992001140A1 System for supporting drive of excavating type underground digging machine |
| 01/22/1992 | EP0467642A2 Earth drilling system and method for controlling the direction of a borehole |
| 01/22/1992 | EP0467335A2 Attitude control device and drilling-direction control device |
| 01/22/1992 | CN1015317B Mining machine |
| 01/21/1992 | US5082069 Combination drivepipe/casing and installation method for offshore well |
| 01/21/1992 | US5082068 Drilling machine for drilling holes in rocks |
| 01/21/1992 | CA1294604C Remote adjustment device controlling the relative position of two interconnected drill stems |
| 01/21/1992 | CA1294495C Deepwater floating drilling and production facility incorporating flexible production risers |
| 01/18/1992 | CA2047316A1 Drilling system and method for controlling the direction of holes being drilled or cored in subsurface formations |
| 01/17/1992 | WO1992001856A1 Variable geometry cluster drill |
| 01/17/1992 | CA2086758A1 Variable geometry cluster drill |
| 01/16/1992 | DE4040155A1 Sinking of deep boreholes by rotary flushing - comprises lowering drill string contg. rotary drill end bit, into the hole then passing flushing fluid through the string |
| 01/14/1992 | USRE33793 Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein |
| 01/13/1992 | CA2045036A1 Adjustable bent sub |
| 01/11/1992 | CA2044901A1 Device for making a hole in the ground |
| 01/09/1992 | WO1991019075A3 Double-tube core drill for inclined drilling |
| 01/09/1992 | DE4021719A1 Enlarging pilot holes in soil - involves power-driven cone with linked bentonite suspension and water ducts followed by protecting tube |
| 01/08/1992 | EP0465072A2 Adjustable bent sub |
| 01/08/1992 | EP0464600A2 Ram-tape core-taking apparatus for earth formations |
| 01/07/1992 | US5078546 Pipe bursting and replacement method |
| 01/07/1992 | US5078545 Method for boring hole in the ground and apparatus therefor |
| 01/07/1992 | US5078218 Steerable drilling mole |
| 01/02/1992 | EP0463211A1 Soil decontamination |
| 01/02/1992 | EP0463198A1 Soil drilling equipment |
| 01/02/1992 | DE4020242A1 Electric wall socket aperture drilling device - has diamond cutting crown around central drill bit and selective hammer drill operating mode |
| 01/01/1992 | CN2091945U Sealing universal joint of cylindrical corrugated pipe |
| 01/01/1992 | CN2091944U Inlaid azimuth controller for directional drilling |
| 12/31/1991 | US5076731 Apparatus for bursting an existing pipe and widening the bore thereof |
| 12/31/1991 | US5076730 Earth duct tunnel enlargement apparatus and method |
| 12/31/1991 | US5076372 Under frame mounted soil sampler for light trucks |
| 12/29/1991 | WO1992000439A1 Vertical drilling boom |
| 12/29/1991 | CA2085471A1 Vertical drilling boom |
| 12/27/1991 | EP0462618A2 Method and apparatus for horizontal drilling |
| 12/27/1991 | EP0462567A2 Horizontal well bore system |
| 12/26/1991 | WO1991019885A1 Apparatus for feeding a drilling machine in extension rod drilling |
| 12/26/1991 | CA2019898A1 Adjustable bent sub |
| 12/24/1991 | US5074366 Method and apparatus for horizontal drilling |
| 12/24/1991 | US5074365 Producing drainage |
| 12/22/1991 | CA2045059A1 Method and apparatus for horizontal drilling |
| 12/22/1991 | CA2043943A1 Horizontal well bore system |
| 12/18/1991 | EP0461140A1 Improvements relating to the lining of pipelines or passageways. |
| 12/17/1991 | US5072656 Method and apparatus for controlling the transfer of tubular members into a shelter |
| 12/17/1991 | CA1293207C Apparatus for correcting irregularities in or enlarging an underground duct |
| 12/12/1991 | WO1991019879A1 Drill steering apparatus |
| 12/12/1991 | WO1991019074A1 Drill head with nozzles |
| 12/12/1991 | WO1991019072A1 Downhole fluid motor composite torque shaft |
| 12/12/1991 | DE4117575A1 Building channels, galleries, etc. underground - involves vertical work-shaft, with drilling equipment parallel to longitudinal axis of channel, etc. to be formed |
| 12/12/1991 | CA2085121A1 Drill steering apparatus |
| 12/12/1991 | CA2064010A1 Drill head with nozzles |
| 12/10/1991 | US5070950 Remote controlled actuation device |
| 12/10/1991 | US5070948 Directional rod pusher |
| 12/05/1991 | DE4016759A1 Hydraulic hammer-scoop combination - fits on excavator arm, and involves support connected to tool rotary axis |
| 12/04/1991 | EP0459008A2 Drilling tool for directional drilling |
| 12/03/1991 | US5069616 Ignition device for lances |
| 12/03/1991 | US5069426 Internal hydraulic pipe pushing apparatus |
| 12/01/1991 | WO1991019075A2 Double-tube core drill for inclined drilling |
| 12/01/1991 | CA2083827A1 Double-tube core drill for inclined drilling |
| 12/01/1991 | CA2017946A1 Bendable drilling sub |
| 11/28/1991 | WO1991018235A1 Pipe bursting and replacement apparatus and method |
| 11/28/1991 | DE4016965A1 Drilling head for tunnel boring - has central channel with nozzles directed to front and rear |
| 11/27/1991 | EP0458767A2 Steering mechanism for a subsoil boring apparatus |
| 11/27/1991 | EP0457994A1 Gas-electroburner with electrical power supply and ignition aid |
| 11/27/1991 | CN1056553A Method and apparatus for drilling and coring |
| 11/26/1991 | USRE33751 System and method for controlled directional drilling |
| 11/26/1991 | US5067854 Apparatus and technique for installing an elongated rod in an earth formation |
| 11/26/1991 | US5067853 Oscillating plow apparatus |
| 11/26/1991 | US5067570 Auger and retaining shell assembly |
| 11/26/1991 | US5067569 Auger and sweeper assembly |
| 11/26/1991 | CA2036528A1 Steering mechanism for a subsoil boring apparatus |
| 11/21/1991 | EP0457563A2 Slant rig cementing apparatus |
| 11/21/1991 | EP0456768A1 Twin-jet process |
| 11/19/1991 | US5065826 Apparatus for optional straight or directional drilling underground formations |
| 11/19/1991 | US5065825 Method and device for remote-controlling drill string equipment by a sequence of information |