| Patents for E21B 3 - Rotary drilling (4,061) |
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| 02/28/2001 | CN1062635C Drilling method and bit assembly to realise method |
| 02/14/2001 | CN1283735A Rotational drilling method able to control vibration of drill rod |
| 02/07/2001 | CN2418245Y Explosion-isolation electric speed-variable rock driller for mine |
| 01/18/2001 | DE19932620A1 Method for harmonic rotating boring of spaces; involves making a virtual regime of the movement path of the technological parameter of the borer, with symmetrical harmonic spirals |
| 01/11/2001 | WO2001002691A1 Rock drill and mounting frame |
| 01/10/2001 | CN2414184Y 钻机 Rig |
| 12/21/2000 | WO2000052297A3 Pipe running tool |
| 12/13/2000 | CN2410407Y Pneumatic anchor rod drilling machine motor double linked wheel |
| 12/12/2000 | US6158818 Rock cutting head |
| 12/12/2000 | US6158516 Combined drilling apparatus and method |
| 11/08/2000 | EP0777810B1 Portable top drive |
| 11/08/2000 | CN2405211Y Screw rod drilling tool motor test bench |
| 11/08/2000 | CN2404998Y Double row roller type square bushing |
| 11/01/2000 | CN2403886Y Shallow hole shaft type light drilling machine |
| 10/10/2000 | US6129162 Rock drill |
| 10/04/2000 | CN2399526Y Underpit sucker-rod plunger oil well pump using oil tube as pump cylinder |
| 09/21/2000 | WO2000055470A1 Drilling rig with pipe handling means |
| 09/20/2000 | CN2397250Y Portable hydraulic drilling machine with high efficient dust-removing series |
| 09/08/2000 | WO2000052298A1 Snubbing unit tong apparatus |
| 09/08/2000 | WO2000052297A2 Pipe running tool |
| 08/24/2000 | DE19906687A1 Drill has gear housing, drive motor, inner and outer pipe, gears, hollow shafts, and intermediate flanges |
| 08/15/2000 | US6102139 Device for drilling a bore hole in the ground |
| 08/02/2000 | CN2390004Y Gas leakage detecting driller |
| 08/02/2000 | CN2390003Y Flexible shaft earth boring machine |
| 07/26/2000 | CN2389231Y Screw drill motor test platform |
| 07/25/2000 | US6092595 Deep drilling and/or well pump system using a hydrodynamic retarder to compensate for restoring torques released in the system |
| 07/19/2000 | EP0886714B1 Device for drilling a bore hole in the ground |
| 07/12/2000 | CN2387256Y Large diameter punching machine |
| 06/28/2000 | CN2385070Y Oscillation double-roller square bushing |
| 06/28/2000 | CN2385069Y Immersible mud turntable |
| 05/24/2000 | CN2379597Y Machine for drilling holes for collision-proof protective railing for high performance high way |
| 05/10/2000 | CN2377342Y Light horizontal engrg. driller |
| 04/27/2000 | CA2251523A1 Kelly bushing |
| 04/26/2000 | CN2375752Y Piling machine |
| 04/26/2000 | CN2375751Y Lower joint of dynamic head for drilling |
| 04/26/2000 | CN2375750Y Dynamic head for petroleum geological prospecting |
| 04/20/2000 | WO2000022278A1 Drilling method |
| 04/19/2000 | EP0994234A2 Rotating head of a drilling column with clutch coupling |
| 04/05/2000 | CN2372443Y Dual-purpose pneumatic jumbolter |
| 03/29/2000 | CN2371327Y Electric top driver for mechanical power bit drilling machine |
| 03/22/2000 | CN2370149Y Screw drill hole and bottom enlarging slip casting drilling machine |
| 03/22/2000 | CN2370148Y Double power multiple drill rod engineering drilling machine |
| 03/15/2000 | CN2368970Y Electric drive controller for drilling rig |
| 03/08/2000 | CN2367759Y drill-rod clamping and drilling apparatus |
| 03/01/2000 | CN2366545Y Machine for drilling large block coal with multiple drillings |
| 03/01/2000 | CN1245861A Submersible mud rotary table |
| 02/23/2000 | CN2365387Y Pretightening device for engineering drilling machine taper roll bearing |
| 02/16/2000 | CN1244623A Drilling rig capable of resisting very high pressure |
| 02/15/2000 | US6024181 Portable top drive |
| 02/02/2000 | CN1243193A Drilling apparatus for basic foundation |
| 01/19/2000 | CN2359446Y Automatic constant-power driving device of drilling rig winch |
| 12/22/1999 | CN2355093Y Core in rotary table of drill rig |
| 12/22/1999 | CN2355092Y Hydraulic impulsive pressurizer for drill |
| 12/08/1999 | CN2352663Y Rotary type protective sleeve double drilling apparatus |
| 11/24/1999 | CN2350517Y Turnplate transmission for winch and cat head winch |
| 11/17/1999 | EP0760899A4 Top entry apparatus and method for a drilling assembly |
| 11/17/1999 | CN2349341Y Water well drilling machine |
| 10/27/1999 | CN2345675Y Cable duct drilling machine |
| 10/21/1999 | WO1999053168A1 Rotary table |
| 10/20/1999 | CN2344535Y Drill set of hydraulic air-pressure drilling machine |
| 10/19/1999 | US5967693 Adapters for auger drive shaft |
| 10/06/1999 | CN2342085Y Multifunctional engineering drill |
| 09/28/1999 | US5957224 Double bit assembly and method of using the same |
| 09/14/1999 | US5950743 Method for horizontal directional drilling of rock formations |
| 08/04/1999 | EP0932745A1 Continuous circulation drilling method |
| 07/28/1999 | CN2330702Y Internal-spiral digger bucket |
| 07/14/1999 | EP0928876A1 Device for drilling a bore hole in the ground |
| 07/13/1999 | US5921329 In a drilling rig |
| 06/16/1999 | CN2324280Y Fast well drilling machine |
| 06/02/1999 | CN2321935Y Light top driving device with novel structure |
| 05/19/1999 | CN2319560Y Hydraulic rock drilling rig |
| 05/04/1999 | US5899283 Drill bit for horizontal directional drilling of rock formations |
| 04/21/1999 | EP0909876A2 System for transmitting data or electric current for a drilling apparatus |
| 04/21/1999 | EP0909362A1 Boring tool for reverse circulation |
| 04/14/1999 | CA2250323A1 Data transfer system |
| 04/07/1999 | CN1213423A Device for drilling bore hole in the ground |
| 03/24/1999 | CN1211665A Drill means |
| 02/09/1999 | US5868208 Power tool |
| 01/21/1999 | DE19741347C1 Drillstring rotary drive with double-acting piston in hydraulic cushioning chambers |
| 01/20/1999 | CN2304747Y Multifunctional drill |
| 01/13/1999 | CN2303927Y Multi-function horizontal pipeline boring machine |
| 01/07/1999 | EP0889196A2 Adapters for auger drive shaft |
| 12/30/1998 | EP0886714A1 Device for drilling a bore hole in the ground |
| 12/17/1998 | WO1998057033A1 Method of controlling rock drilling |
| 12/17/1998 | CA2293643A1 Method of controlling rock drilling |
| 12/16/1998 | EP0884448A2 Rock drill bit with helical evacuation grooves |
| 12/09/1998 | CA2237468A1 Adapters for auger drive shaft |
| 11/12/1998 | DE19721059C1 Drilling arrangement including conventional slow, high torque rotary percussion drive |
| 11/11/1998 | CN1198502A Boring device and torque support for boring device |
| 10/14/1998 | CN2294326Y Vertical rotary drilling machine |
| 09/23/1998 | CN2292158Y Drill line threading device for drill |
| 09/22/1998 | US5809916 Inserting device for coiled tubing |
| 09/08/1998 | US5803191 Well entry tool |
| 08/26/1998 | CN1191263A Model-SPR-1 row-of-piles driller |
| 08/18/1998 | US5795079 Shaft bearing in a rock and ground-drilling machine |
| 08/18/1998 | US5794724 For drilling openings in concrete and related materials |
| 08/13/1998 | DE19704263C1 Earth drilling machine |
| 08/12/1998 | EP0857853A2 Drill bit for horizontal directional drilling of rock formations |
| 08/12/1998 | EP0857852A2 Method for horizontal directional drilling of rock formations |
| 08/12/1998 | CN1190150A Drill bit for horizontal directional drilling of rock formations |