| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
|---|
| 03/06/1990 | US4905777 Device for producing drilling holes from an angled position with respect to the drilling axis |
| 03/06/1990 | US4905776 Self-balancing drilling assembly and apparatus |
| 03/06/1990 | US4905774 Process and device for guiding a drilling tool through geological formations |
| 03/06/1990 | US4905773 Self-propelled subsoil penetrating tool system |
| 02/27/1990 | US4904119 Process for placing a piling in the ground, a drilling machine and an arrangement for implementing this process |
| 02/27/1990 | US4904116 Apparatus for making tunnels in the ground and for laying supply lines |
| 02/21/1990 | CN1039870A Arrangement for operating hydraulic actuating means in rock boom and like boom construction |
| 02/21/1990 | CN1039865A Radiation well series-bead cave well tethnology |
| 02/21/1990 | CN1039864A Radiation well siphonate type series accomplishing well technology |
| 02/21/1990 | CN1006867B Exothermic cutting electrode |
| 02/13/1990 | US4899835 For eroding earth in a forward path |
| 02/13/1990 | US4899834 Electromagnetic drilling apparatus |
| 02/13/1990 | US4899833 Downhole drilling assembly orienting device |
| 02/13/1990 | US4899832 Modular well drilling apparatus and methods |
| 02/13/1990 | CA1265782A1 Directional drilling of a drill string |
| 02/08/1990 | WO1990001102A1 Drilling device and method for the study and exploitation of the underground |
| 02/07/1990 | EP0353442A2 Method and boring ram for laying service lines without excavation |
| 02/07/1990 | EP0353400A2 Boring ram |
| 02/07/1990 | EP0353309A1 Method of constructing a well |
| 02/07/1990 | CN1039465A Method of and arrangement for drilling hole in rock |
| 02/06/1990 | US4898251 Earth boring apparatus |
| 02/06/1990 | CA1265601A1 Programmed automatic drill control |
| 02/01/1990 | DE3924469A1 Anordnung zur betaetigung hydraulischer bedienungsgeraete eines gesteinsbohrarms oder einer aehnlichen bohrarmkonstruktion Arrangement for actuating hydraulic equipment at a user-gesteinsbohrarms or similar bohrarmkonstruktion |
| 02/01/1990 | DE3902870A1 Method of sinking bores in subterranean rock formations |
| 01/31/1990 | EP0353168A1 Method and drilling machine for examination and exploitation of the subsoil |
| 01/31/1990 | EP0353152A1 Device for withdrawing dug material for making deep trenches |
| 01/31/1990 | EP0352979A2 Variable amplitude drill |
| 01/31/1990 | EP0352349A1 Shield tunneling machine |
| 01/31/1990 | EP0247125B1 Improvements in directional drilling of a drill string |
| 01/30/1990 | US4896733 Technique for providing an underground tunnel utilizing a powered boring device |
| 01/30/1990 | CA1265123A1 Mechanically actuated whipstock assembly |
| 01/30/1990 | CA1265122A1 Assembly enabling oriented drilling |
| 01/30/1990 | CA1265043A1 Borehole extraction of minerals |
| 01/30/1990 | CA1264934A1 Curvature probe and method |
| 01/25/1990 | WO1990000666A1 Device for steering the direction of drilling |
| 01/25/1990 | DE3920567A1 Process and apparatus for laying pipes in the ground |
| 01/25/1990 | DE3814939C1 Drilling device for directionally accurate drilling |
| 01/24/1990 | EP0351694A2 Stopper apparatus for rotary reaction force |
| 01/23/1990 | US4895214 Directional drilling tool |
| 01/23/1990 | CA1264732A1 Rotatable end deflector for abrasive waterjet drill |
| 01/23/1990 | CA1264658A1 Method of an apparatus for crushing earth under the ground |
| 01/18/1990 | DE3839760C1 Double rotary drilling apparatus for making directionally accurate bores, in particular horizontal bores |
| 01/17/1990 | EP0350806A2 Soil displacement hammer |
| 01/17/1990 | EP0350581A2 Elongate body |
| 01/17/1990 | EP0350580A2 Process and apparatus for driving tubes |
| 01/11/1990 | WO1990000216A1 A device for drilling in and/or lining holes in earth |
| 01/02/1990 | US4890682 Apparatus for vibrating a pipe string in a borehole |
| 01/02/1990 | US4890680 Machine for working rock, especially a block drilling machine |
| 01/02/1990 | US4890675 Horizontal drilling through casing window |
| 12/28/1989 | DE3832214C1 Process for exchanging a buried pipeline, and apparatus for carrying out the process |
| 12/28/1989 | DE3820924A1 Soil sample removal probe |
| 12/27/1989 | EP0348118A2 Method for boring hole in the ground and apparatus therefor |
| 12/27/1989 | CN1038326A Multifunctional hydraulic direction-changing apparatus for drill bit |
| 12/26/1989 | US4889194 Method and a device for deep hole drilling |
| 12/26/1989 | US4889193 Rotary drill guard assembly and method |
| 12/14/1989 | WO1989012156A1 Method for improving drill cuttings transport from a wellbore |
| 12/14/1989 | DE3917931A1 Verfahren und anordnung zum bohren eines lochs in einen felsen Method and arrangement for drilling a hole in a rock |
| 12/14/1989 | DE3819818A1 Measuring method for surveying the ground in the zone in front of the face during underground driving of tunnel cross-sections |
| 12/14/1989 | DE3819567A1 Working head for pipe jacking operation, in particular with removal of the excavated material by means of a transport container |
| 12/14/1989 | DE3818998A1 Process and apparatus for laying supply lines |
| 12/13/1989 | EP0345945A1 Method and apparatus for laying pipes in the ground with advance of propulsion shafts installed with pipe-supporting attachments |
| 12/13/1989 | EP0345650A2 Anchor hole drilling rig |
| 12/13/1989 | CN1037944A Apparatus for making holes in soil |
| 12/12/1989 | US4886396 Existing pipeline renewing method and apparatus therefor |
| 12/12/1989 | US4886394 Shield tunneling machine |
| 12/12/1989 | US4886130 Nutational technique for limiting well bore deviation |
| 12/06/1989 | EP0344412A1 Process and device for the continuous measuring of the relative height of a long object driven into the earth |
| 12/05/1989 | US4885591 Method and apparatus for monitoring ice masses |
| 12/05/1989 | US4884643 Downhole adjustable bent sub |
| 11/30/1989 | DE3818030A1 Roadway support machine with combined drilling and support-setting apparatus |
| 11/29/1989 | EP0343800A2 Apparatus for providing an underground tunnel |
| 11/29/1989 | EP0273974B1 Device for making holes in ground |
| 11/29/1989 | CN2048510U Electric controlled pneumatic automatic drill system |
| 11/28/1989 | US4883133 Combustion operated drilling apparatus |
| 11/23/1989 | EP0343140A2 Method and device for surveying the progression of a drilling head in the ground |
| 11/23/1989 | EP0342246A1 Existing pipeline renewing method and apparatus therefor |
| 11/16/1989 | WO1989011005A1 Device for making wells in ground |
| 11/16/1989 | DE3815263A1 Process and apparatus for laying buried pipelines |
| 11/14/1989 | US4881083 Homing technique for an in-ground boring device |
| 11/14/1989 | US4880067 Apparatus for drilling a curved borehole |
| 11/14/1989 | US4880066 Assembly for directional drilling of boreholes |
| 11/09/1989 | DE3907637A1 Rodless drilling, pressure or cleaning implement |
| 11/08/1989 | EP0340280A1 Self-propelled subsoil penetrating tool system |
| 11/07/1989 | US4878547 Rock drilling apparatus |
| 11/02/1989 | WO1989010467A1 Method and apparatus for the production of underground pipelines |
| 11/02/1989 | WO1989010464A1 Process and device for monitoring the advance of a drilling head in the ground |
| 11/02/1989 | EP0340187A1 Drill string element |
| 11/02/1989 | EP0339210A1 Pipe enlarging device |
| 11/01/1989 | CN2046916U Compound material supporting device for drilling pump cross head |
| 11/01/1989 | CN1036811A Drill |
| 11/01/1989 | CN1005639B Trench excavator |
| 10/31/1989 | US4877092 Near bit offset stabilizer |
| 10/31/1989 | US4877091 Augering apparatus and drilling rig |
| 10/26/1989 | DE3812917A1 Slotted tubular drill for earth, etc. |
| 10/24/1989 | US4875292 Control system for earth boring tool |
| 10/24/1989 | CA1262455A1 Drill bit |
| 10/17/1989 | US4874268 Method and apparatus for building pipeline and shield tunnelling machine |
| 10/17/1989 | US4874045 Straight hole drilling method and assembly |
| 10/12/1989 | DE3811036A1 Pipe-jacking apparatus, in particular for jacking pipes of small diameter in the earth |
| 10/12/1989 | DE3810410A1 Soil-displacement unit |