| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
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| 09/24/2002 | US6454025 Apparatus for directional boring under mixed conditions |
| 09/24/2002 | US6454011 Method and system for moving equipment into and through a conduit |
| 09/24/2002 | US6454007 Method and apparatus for casing exit system using coiled tubing |
| 09/19/2002 | WO2001009478A9 Long reach rotary drilling assembly |
| 09/11/2002 | EP1239112A2 Method and apparatus to vibrate a downhole component |
| 09/11/2002 | CN2510613Y Screw-arbor drill driving-shaft assembly |
| 09/10/2002 | US6446737 Apparatus and method for rotating a portion of a drill string |
| 09/05/2002 | US20020121378 Method and apparatus to vibrate a downhole component |
| 08/29/2002 | US20020117333 Balance structure for rotating member |
| 08/28/2002 | EP1234099A1 Downhole pulser |
| 08/28/2002 | EP1234091A1 Downhole device |
| 08/28/2002 | EP0692061B1 Percussion drilling improvements |
| 08/27/2002 | US6439866 Downhole rotary motor with sealed thrust bearing assembly |
| 08/27/2002 | US6439834 Oil field tool |
| 08/27/2002 | US6439322 Downhole hammer-type core barrel and method of using same |
| 08/27/2002 | US6439319 Method and apparatus for directional boring under mixed conditions |
| 08/27/2002 | CA2270856C Flow restrictor valve for a downhole drilling assembly |
| 08/22/2002 | US20020112859 Tractor with improved valve system |
| 08/21/2002 | EP1232324A1 Device for manipulating a tool in a well tubular |
| 08/13/2002 | US6431294 Percussive tool |
| 08/13/2002 | US6431291 Packerfoot with bladder assembly having reduced likelihood of bladder delamination |
| 08/13/2002 | US6431270 Downhole tools with a mobility device |
| 08/13/2002 | CA2255288C Apparatus and method for stabilized downhole drilling motor |
| 08/13/2002 | CA2072228C Steerable rotary drilling systems |
| 08/08/2002 | US20020104686 Gripper assembly for downhole tractors |
| 08/07/2002 | EP0993538A4 Downhole mud motor |
| 08/06/2002 | US6427987 Radially compressed elastic rope |
| 08/06/2002 | US6427787 Drilling motor that operates pursuant to the Moineau principle for drilling deep holes |
| 08/06/2002 | US6427786 Electro-hydraulically controlled tractor |
| 07/18/2002 | WO2002055838A1 Improved downhole tool |
| 07/18/2002 | WO2002055837A1 Pressure pulsing apparatus at surface and method for drilling |
| 07/18/2002 | WO2002055834A1 Device for anchoring a drill string in a borehole |
| 07/18/2002 | WO2002055833A1 Downhold mud motor and transmission |
| 07/18/2002 | US20020092682 Downhole mud motor |
| 07/16/2002 | US6419014 Apparatus and method for orienting a downhole tool |
| 07/10/2002 | EP1117893A4 Lubricant circulation system for downhole bearing assembly |
| 07/09/2002 | US6416225 Bearing assembly for wellbore drilling |
| 07/09/2002 | CA2331021A1 Method and apparatus for generating acoustic pulses on the surface and conveying these pulses through the drill string to the drill bit to increase rate of drilling |
| 07/04/2002 | US20020084109 Steerable fluid hammer |
| 07/03/2002 | CN1356450A Drilling apparatus for drilling well in stratum |
| 06/26/2002 | EP1101013A4 Reverse circulation drilling system with bit locked underreamer arms |
| 06/25/2002 | US6409432 Downhole hammer-type core barrel and method of using same |
| 06/20/2002 | US20020074167 High speed positive displacement motor |
| 06/19/2002 | CN1354817A Method and system for moving equipment into and through conduit |
| 06/18/2002 | US6406215 Positive connection between a pipe and a ring inserted into the pipe |
| 06/13/2002 | WO2002046565A2 Speed governor |
| 06/13/2002 | WO2002046564A2 Boring apparatus |
| 06/13/2002 | DE10146025A1 Pneumatische Felsbohrvorrichtung Pneumatic Felsbohrvorrichtung |
| 06/12/2002 | CN1353792A Method of creating well bore |
| 06/06/2002 | WO2002044511A1 Pneumatic rock-boring device and method for starting such a device |
| 06/06/2002 | WO2002044509A2 Tractor with improved valve system |
| 06/06/2002 | WO2002044508A2 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium |
| 06/06/2002 | US20020066599 Rock drill |
| 06/04/2002 | CA2245098C Method and apparatus for conveying a logging tool through an earth formation |
| 05/30/2002 | WO2002042647A2 Hydraulic drill string accumulator |
| 05/30/2002 | WO2002042596A1 Hydraulic cam motor |
| 05/30/2002 | US20020062993 Method apparatus for horizontal drilling and oil recovery |
| 05/28/2002 | US6394197 Reverse circulation drilling system with bit locked underreamer arms |
| 05/23/2002 | WO2002040820A1 Percussive down-the-hole hammer for rock drilling, and a drill bit used therein |
| 05/23/2002 | WO2001066900A3 Method and apparatus for directional boring under mixed conditions |
| 05/23/2002 | US20020060914 High frequency power generator and related methods |
| 05/21/2002 | US6392561 Short hop telemetry system and method |
| 05/21/2002 | US6390207 Method and apparatus for directional boring under mixed conditions |
| 05/16/2002 | WO2001098619A3 Drive system |
| 05/14/2002 | US6386301 Down-hole hammer |
| 05/02/2002 | US20020050359 Drilling method |
| 05/01/2002 | CN1347186A Improved coring drill motor and method for obtaining core sample of matter |
| 04/30/2002 | US6378627 Autonomous downhole oilfield tool |
| 04/30/2002 | US6378626 Balanced torque drilling system |
| 04/24/2002 | EP1198655A1 Continuous wellbore drilling system with stationary sensor measurements |
| 04/18/2002 | US20020043406 Method and apparatus for directional boring under mixed conditions |
| 04/17/2002 | EP1144795A4 Downhole mud motor transmission |
| 04/16/2002 | US6371223 Drill head for directional boring |
| 04/16/2002 | US6371221 Coring bit motor and method for obtaining a material core sample |
| 04/16/2002 | US6371220 Pneumatically reversible ram drilling tool |
| 04/16/2002 | US6371209 Casing installation and removal apparatus and method |
| 04/11/2002 | WO2000052294A9 Drill head for directional boring |
| 04/09/2002 | US6367565 Means for detecting subterranean formations and monitoring the operation of a down-hole fluid driven percussive piston |
| 04/09/2002 | US6367366 Sensor assembly |
| 04/02/2002 | US6364038 Downhole flexible drive system |
| 04/02/2002 | US6364034 Directional drilling apparatus |
| 03/28/2002 | WO2002025061A1 Apparatus for drilling large bore holes in rock and soil |
| 03/27/2002 | CN1342242A Metal molten drilling method |
| 03/26/2002 | US6361217 High capacity thrust bearing |
| 03/21/2002 | DE10115307C1 Ground soil sampling device has inner part of front point retracted inwards at required sampling position for extraction of soil plug |
| 03/20/2002 | EP1187997A1 High capacity thrust bearing |
| 03/14/2002 | WO2002020934A1 Percussive down-the-hole hammer for rock drilling, a top sub used therein and a method for adjusting air pressure |
| 03/14/2002 | US20020032126 Borehole retention device |
| 03/14/2002 | US20020029908 Electrically sequenced tractor |
| 03/13/2002 | CN1339649A Electric well drilling machine without drilling rod |
| 03/07/2002 | DE10132753A1 Horizontal direction drilling machine, uses planetary gear mechanism to keep excavator head rotation speed lower than drive shaft rotation speed |
| 02/27/2002 | EP1181470A1 High pressure rotary shaft sealing mechanism |
| 02/27/2002 | EP1181432A1 Method of creating a wellbore |
| 02/27/2002 | CN1079881C Hydraulic device to be connected in pipe string |
| 02/27/2002 | CN1079879C Drilling device, drilling system and drilling method |
| 02/27/2002 | CN1079877C Device for drilling bore hole in the ground |
| 02/21/2002 | WO2001040613A3 Reciprocating rotary drilling motor |
| 02/21/2002 | US20020020566 Working tool for a percussion power tool |
| 02/19/2002 | US6347674 Electrically sequenced tractor |
| 02/07/2002 | US20020014354 Hydraulic in-the-hole percussion rock drill |