| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
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| 01/21/1998 | EP0819828A2 Apparatus for completing a subterranean well and method of using same |
| 01/21/1998 | EP0819827A2 Apparatus for completing a subterranean well and method of using same |
| 01/21/1998 | EP0819826A2 Apparatus for completing a subterranean well and methods of using same |
| 01/21/1998 | EP0819825A2 Apparatus for completing a subterranean well and method of using same |
| 01/21/1998 | EP0819824A2 Method of completing a subterranean well |
| 01/21/1998 | EP0819823A2 Apparatus for completing a subterranean well and method of using same |
| 01/21/1998 | EP0819822A2 Apparatus for completing subterranean well and method of using same |
| 01/21/1998 | EP0819820A1 Horizontal drilling machine |
| 01/21/1998 | EP0819819A1 Milling head,drilling device and method for underwater drilling |
| 01/21/1998 | EP0819205A1 A surface controlled wellbore directional steering tool |
| 01/21/1998 | CN1171142A Steerable drilling with downhole motor |
| 01/20/1998 | US5709277 Directional boring machine |
| 01/20/1998 | US5709276 Multi-position directional drill |
| 01/20/1998 | US5709265 Wellbore window formation |
| 01/17/1998 | CA2209874A1 Improved thru tubing whipstock and method |
| 01/15/1998 | CA2209958A1 Apparatus for completing a subterranean well and associated methods of using same |
| 01/15/1998 | CA2209797A1 Apparatus for completing a subterranean well and associated methods of using same |
| 01/15/1998 | CA2208814A1 Apparatus for completing a subterranean well and associated methods of using same |
| 01/15/1998 | CA2208813A1 Apparatus for completing a subterranean well and associated methods of using same |
| 01/14/1998 | EP0817938A1 Corrosion protection for steel pipes |
| 01/14/1998 | EP0817936A1 Process and device for pulling a pipe laid or to be laid in the ground |
| 01/14/1998 | EP0817901A1 Dual-member pipe joint for a dual member drill string |
| 01/13/1998 | US5707180 Method and apparatus for forming piles in-situ |
| 01/13/1998 | US5707176 Earth discharge control system for small-diameter pipe propelling machine |
| 01/13/1998 | US5706905 Steerable rotary drilling systems |
| 01/07/1998 | EP0816633A1 Tunnel excavator |
| 01/07/1998 | EP0816627A2 Underground drilling method |
| 01/07/1998 | EP0815352A1 An arrangement in a feed beam of a rock drill |
| 01/07/1998 | EP0815345A1 Milling tool, whipstock, milling system and method of forming a window in the wall of a tubular |
| 01/07/1998 | EP0815344A1 Whipstock |
| 01/07/1998 | EP0815342A1 Improved casing shoe |
| 01/07/1998 | EP0815339A1 Pressure converter (b) |
| 01/07/1998 | EP0815338A1 Pressure converter (a) |
| 01/07/1998 | EP0815337A1 Traction boring device using multiple trepans for producing large cuts in concrete works and the like and method of producing cuts |
| 01/07/1998 | CN1169765A A drilling method and bit assembly to realise method |
| 01/06/1998 | US5704716 In a rock drilling machine |
| 01/06/1998 | US5704437 Method of enhancing production from a well |
| 12/31/1997 | WO1997049893A1 Method for increasing crude-oil and gas extraction and for drilling in and monitoring field beds |
| 12/31/1997 | WO1997049889A1 A system for directional control of drilling |
| 12/31/1997 | CN2271606Y Ultrapressure injector |
| 12/31/1997 | CA2258236A1 A system for directional control of drilling |
| 12/30/1997 | US5701963 Continuous injection of an inert gas through a drill rig for drilling into potentially hazardous areas |
| 12/30/1997 | CA2104010C Oil, gas or geothermal drilling apparatus |
| 12/29/1997 | EP0664011A4 Vibrating hole forming device for seismic exploration. |
| 12/29/1997 | EP0663040A4 Method for forming a window in a subsurface well conduit. |
| 12/23/1997 | US5699866 Sectional drive system |
| 12/18/1997 | WO1997047848A1 Drilling apparatus |
| 12/18/1997 | DE19625114A1 Method of forming high efficiency geothermal probe |
| 12/18/1997 | DE19625113A1 Improvement of heat exchange in closed circuit geothermal probe |
| 12/17/1997 | EP0812976A2 Underground apparatus for directional drilling without earth removal |
| 12/17/1997 | EP0812377A1 Hydraulic tubing machine as an attachment for a mobile rotary boring installation |
| 12/17/1997 | EP0657006A4 Guided mole. |
| 12/17/1997 | CN1168165A Drilling and pipe laying unit |
| 12/16/1997 | US5697733 Centrifugal force vibration apparatus and system |
| 12/16/1997 | US5697457 No load derrick for drilling rig |
| 12/16/1997 | US5697445 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 12/16/1997 | US5697438 Torque control device for downhole milling |
| 12/11/1997 | WO1997046787A1 A hydraulic device to be connected in a pipe string |
| 12/11/1997 | WO1997046786A1 A drilling apparatus and method |
| 12/10/1997 | EP0811745A1 Steering device for a directional drilling tool |
| 12/10/1997 | EP0811744A1 Method and device for excavating a hole in underground formations |
| 12/10/1997 | EP0811106A1 Method of inserting a pipe into the ground |
| 12/10/1997 | EP0811105A1 Plasma blasting probe assembly |
| 12/09/1997 | US5695017 Earth boring apparatus |
| 12/09/1997 | US5695015 System and method of controlling rotation of a downhole instrument package |
| 12/09/1997 | US5695014 Ram boring apparatus |
| 12/09/1997 | US5695010 Method of drilling around an existing casing pipe to regenerate an old well |
| 12/06/1997 | CA2206959A1 Well boring method and apparatus |
| 12/04/1997 | WO1997045623A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 12/04/1997 | WO1997045622A1 Wellbore resonance tools |
| 12/04/1997 | WO1997045619A1 Multicut window mill |
| 12/04/1997 | DE19622241A1 Method for breaking up hard materials by jets of fluid in tunnelling or mining by galleries |
| 12/02/1997 | US5692576 Locating device for percussion boring machines |
| 12/02/1997 | US5692565 Apparatus and method for sampling an earth formation through a cased borehole |
| 11/27/1997 | WO1997044565A1 Downhole apparatus |
| 11/27/1997 | WO1997044564A1 Drilling apparatus |
| 11/26/1997 | CN1165924A Guided drilling system with shock absorber |
| 11/25/1997 | CA2044945C Adjustable bent housing |
| 11/25/1997 | CA2025432C Bearing apparatus and method for preloading bearings for rotary - vibratory drills |
| 11/21/1997 | CA2205783A1 Steerable boring machine |
| 11/20/1997 | WO1997043514A1 Sectional drive system |
| 11/20/1997 | DE19619532A1 Method for producing accessible tunnel |
| 11/20/1997 | CA2254346A1 Sectional drive system |
| 11/19/1997 | EP0807203A1 Continuous control system for a mining or tunnelling machine |
| 11/19/1997 | EP0807201A1 Multiple drain drilling and production apparatus |
| 11/18/1997 | US5687806 Method and apparatus for drilling with a flexible shaft while using hydraulic assistance |
| 11/18/1997 | US5687805 Back reamer apparatus |
| 11/13/1997 | WO1997042393A1 Multi-activity offshore exploration and/or development drilling method and apparatus |
| 11/13/1997 | DE19718573A1 Geological bore drill bit for low-angle or horizontal drilling |
| 11/12/1997 | EP0806543A1 Drilling apparatus for percussive drilling |
| 11/12/1997 | EP0806542A2 Steerable rotary drilling system |
| 11/12/1997 | CN1164882A Device for drilling holes and/or slits |
| 11/12/1997 | CN1164606A Differential control, nondestructive blasting rock-implanting process for punching, drilling and filling pile for building foundation |
| 11/11/1997 | US5685382 Quadrapod auger support |
| 11/11/1997 | US5685379 Method of operating a steerable rotary drilling system |
| 11/11/1997 | US5685373 Assembly and process for drilling and completing multiple wells |
| 11/06/1997 | WO1997041331A1 Selective mono bore diverter system |
| 11/06/1997 | WO1997041330A2 Multi-lateral wellbore system and method for forming same |
| 11/06/1997 | WO1997032110A3 Downhole core sampling and testing apparatus |
| 11/06/1997 | DE19616979A1 Safety device for forced removal of material from underground pipes |