| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
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| 09/21/2000 | WO2000055473A1 Core barrel |
| 09/21/2000 | WO2000055469A1 Method and apparatus for underground drilling |
| 09/21/2000 | WO2000055468A1 Directional drilling system for hard rock |
| 09/21/2000 | WO2000055467A1 Method and apparatus for directional boring |
| 09/21/2000 | CA2366115A1 Method and apparatus for directional boring |
| 09/21/2000 | CA2365874A1 Directional drilling system for hard rock |
| 09/20/2000 | CN1267353A Drilling system with means for anchoring in borehole |
| 09/19/2000 | US6119795 Hydraulic hammer having improved seal ring |
| 09/14/2000 | WO2000053883A1 Moulten bath drilling method |
| 09/12/2000 | CA2071611C Bearing assembly for a downhole motor |
| 09/08/2000 | WO2000052377A1 Reverse circulation drilling system with hexagonal pipe coupling |
| 09/08/2000 | WO2000052294A2 Drill head for directional boring |
| 09/07/2000 | DE19909836A1 Metallschmelze-Bohrverfahren Molten metal drilling |
| 09/05/2000 | USRE36848 Air percussion drilling assembly |
| 09/05/2000 | US6112809 Downhole tools with a mobility device |
| 08/31/2000 | WO2000050731A1 Drilling method |
| 08/29/2000 | US6109836 Soil consolidation apparatus, tool and method |
| 08/29/2000 | US6109790 Lubricant circulation system for downhole bearing assembly |
| 08/15/2000 | US6102139 Device for drilling a bore hole in the ground |
| 08/15/2000 | US6102138 Pressure-modulation valve assembly |
| 08/10/2000 | WO2000046481A2 Downhole tractor |
| 08/10/2000 | WO2000046478A1 Thrust bearing for down-hole tool |
| 08/10/2000 | CA2361746A1 Thrust bearing for down-hole tool |
| 08/09/2000 | EP1025362A1 Downhole roller vane motor and roller vane pump |
| 08/02/2000 | EP0883730A4 A drilling apparatus |
| 08/02/2000 | EP0837979A4 Drill bit retainer for a down hole hammer assembly |
| 08/01/2000 | US6095257 Hydraulic hammer having buffer assembly |
| 07/25/2000 | US6092610 Actively controlled rotary steerable system and method for drilling wells |
| 07/25/2000 | US6092601 Apparatus for completing a subterranean well and associated methods of using same |
| 07/19/2000 | EP0886714B1 Device for drilling a bore hole in the ground |
| 07/19/2000 | CN1260857A Earth formation surveying device |
| 07/18/2000 | US6089323 Tractor system |
| 07/05/2000 | CN2386176Y Hydraulic double-action spin drilling tool |
| 07/04/2000 | US6082461 Bore tractor system |
| 06/29/2000 | DE19858519A1 Pneumatisch umsteuerbares Rammbohrgerät Pneumatic umsteuerbares ram boring machine |
| 06/28/2000 | EP1012440A1 Boring device |
| 06/22/2000 | WO2000036266A1 Electro-hydraulically controlled tractor |
| 06/22/2000 | WO2000036265A1 Stabilized downhole drilling motor |
| 06/22/2000 | WO2000036263A1 Downhole mud motor transmission |
| 06/21/2000 | CN1257153A Multi-function submerged drill |
| 06/20/2000 | US6076602 Apparatus for completing a subterranean well and associated methods of using same |
| 06/18/2000 | CA2686627A1 Electrically sequenced tractor |
| 06/15/2000 | CA2256069A1 Free-wheeling clutch for a downhole drilling assembly |
| 06/13/2000 | US6073708 Downhole mud pressure intensifier |
| 06/07/2000 | EP1006260A2 Drilling liner systems |
| 06/07/2000 | EP1005602A1 Drilling system with means for anchoring in the borehole |
| 06/06/2000 | US6070678 Bit retention system |
| 05/31/2000 | EP1004744A2 Segmented ring mounting for a fluid-operated percussion drill tool |
| 05/17/2000 | EP0759115B1 Device for controlling the drilling direction of drill bit |
| 05/16/2000 | US6062324 Fluid operated vibratory oil well drilling tool |
| 05/16/2000 | US6062322 Precussive down-the-hole rock drilling hammer |
| 05/11/2000 | DE19850183A1 Hammer drill head has a moving piston in a chamber to compress the drilling fluid for delivery through at least one outlet jet for horizontal drilling in rock with a drilling fluid |
| 05/09/2000 | US6059037 Apparatus for completing a subterranean well and associated methods of using same |
| 05/04/2000 | WO2000024997A1 Down hole motors and methods for their operation |
| 05/03/2000 | EP0996806A1 Method and apparatus for moving a piston |
| 04/19/2000 | EP0993538A1 Downhole mud motor |
| 04/18/2000 | US6050349 Hydraulic system for mud pulse generation |
| 04/18/2000 | US6050347 In Hole hammer |
| 04/18/2000 | US6050346 High torque, low speed mud motor for use in drilling oil and gas wells |
| 04/18/2000 | CA2034001C Device for guiding a drilling tool within a well and for applying a hydraulic force to said tool |
| 04/12/2000 | EP0991845A1 Earth formation surveying device |
| 04/11/2000 | US6047778 Percussion drill assembly |
| 04/06/2000 | WO2000019054A1 Lubricant circulation system for downhole bearing assembly |
| 04/05/2000 | EP0990765A1 Percussive core barrel |
| 03/15/2000 | EP0733153B1 A hydraulic impact motor |
| 03/14/2000 | US6035954 Fluid operated vibratory oil well drilling tool with anti-chatter switch |
| 03/14/2000 | US6035934 Method and system for separating and injecting gas in a wellbore |
| 03/09/2000 | DE19910292A1 Ground boring ram directed by steering head twists head relative ram housing through indicated angle to change from straightening to curved drivage. |
| 03/02/2000 | WO2000011304A1 Reverse circulation drilling system with bit locked underreamer arms |
| 03/02/2000 | CA2338579A1 Reverse circulation drilling system with bit locked underreamer arms |
| 03/01/2000 | EP0981678A1 Arrangement in a drilling apparatus |
| 03/01/2000 | EP0853715B1 Apparatus and method for milling a well casing |
| 02/25/2000 | CA2280481A1 Downhole oil-sealed bearing pack assembly |
| 02/24/2000 | WO1999064711A3 Improved backhead and check valve for down-hole drills |
| 02/22/2000 | US6026911 Downhole tools using artificial intelligence based control |
| 02/17/2000 | WO2000008293A1 Drilling turbine |
| 02/15/2000 | CA2058040C Large bore hydraulic drilling jar |
| 02/09/2000 | EP0978625A2 Percussive drill |
| 02/08/2000 | USRE36556 Method and apparatus for drilling bore holes under pressure |
| 02/03/2000 | WO1999060244A9 Multiple lateral hydraulic drilling apparatus and method |
| 02/01/2000 | US6019182 Collar mounted downhole tool |
| 01/27/2000 | WO1999057416A8 Jet cleaning apparatus |
| 01/20/2000 | WO2000003115A1 Boring device |
| 01/20/2000 | WO2000003113A1 A hydraulic pushing-expanding device |
| 01/18/2000 | US6015018 Method and apparatus for moving a piston |
| 01/13/2000 | DE19831009A1 Bohrvorrichtung Drilling device |
| 01/11/2000 | US6012537 Printed circuit board mounting for oil tools |
| 12/28/1999 | CA2159861C Reversible pneumatic ground piercing tool |
| 12/23/1999 | WO1999066171A2 Method and system for moving equipment into and through an oil and/or gas production well |
| 12/23/1999 | WO1999066167A1 Percussive down-the-hole rock drilling hammer and an arrangement used therein |
| 12/23/1999 | WO1999066166A1 Percussive down-the-hole rock drilling hammer, and a piston used therein |
| 12/23/1999 | DE19827101A1 Machine used in deep drilling, especially in crude oil recovery |
| 12/21/1999 | US6003606 Puller-thruster downhole tool |
| 12/16/1999 | WO1999064715A1 Downhole milling device |
| 12/16/1999 | WO1999064711A2 Improved backhead and check valve for down-hole drills |
| 12/16/1999 | CA2334150A1 Downhole milling device |
| 12/15/1999 | EP0964131A2 Conveying a tool along a non-vertical well |
| 12/14/1999 | US6000477 Apparatus for applying additional momentum |
| 12/01/1999 | EP0960254A1 Reverse circulation drilling system with bit locked underreamer arms |
| 11/30/1999 | US5992545 Down-the-hole drilling machine |