| Patents for E21B 1 - Percussion drilling (2,080) |
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| 07/27/2005 | CN1212452C Plate guided bucket boring process for site casting foundation piles |
| 07/05/2005 | US6913091 Method and apparatus for replacement of underground pipe |
| 06/29/2005 | EP1546503A1 Impact adapter for transfer of impacts and rotation from an impact rock drilling machine to a drill string |
| 06/29/2005 | EP1545839A1 Sonic drill |
| 06/22/2005 | EP1543214A2 Non-corrosive amphoteric surfactants and method of well treatment |
| 06/22/2005 | CN1629445A Fast drilling pick |
| 06/15/2005 | EP1540219A2 Method and apparatus for replacement of underground pipe |
| 06/15/2005 | EP1540137A2 System and mehtod for automating or metering fluid recovered at a well |
| 06/08/2005 | EP1537289A2 New and improved method and apparatus involving an integrated or otherwise combined exit guide and section mill for sidetracking or directional drilling from existing wellbores |
| 06/01/2005 | EP1535061A2 Method for measuring fluid chemistry in drilling and production operations |
| 05/25/2005 | CN2702039Y Automatic bit feed device of disc brake |
| 05/24/2005 | US6896448 Automatically adjustable caisson clamp |
| 05/24/2005 | US6896048 Rotary support table |
| 05/05/2005 | US20050093361 Method and means for processing oil sands while excavating |
| 05/05/2005 | US20050092503 Shockproof spindle |
| 04/26/2005 | CA2234448C Method for adjusting drilling of drilling machine and rock drill |
| 04/21/2005 | WO2003060282A3 Method and apparatus for replacement of underground pipe |
| 04/14/2005 | WO2005033467A1 Method and device for the drilling of holes in ground or rocky material |
| 04/14/2005 | CA2540963A1 Method and device for the drilling of holes in ground or rocky material |
| 04/13/2005 | CN1606653A Rotary support table |
| 04/07/2005 | WO2005009688A3 Hollow piston hammer device with air equilibration and idle openings |
| 04/07/2005 | DE4323126B4 Handgeführtes Bohrgerät The hand-held drill |
| 04/06/2005 | CN1603569A Submersible pump type hydraulic impactor |
| 03/30/2005 | CN2688861Y Sealer for drill tail sleeve of pneumatic hammer drill |
| 03/17/2005 | WO2004079145A3 Method for drilling and completing wells |
| 03/10/2005 | WO2004106942A3 Method for measuring fluid chemistry in drilling and production operations |
| 03/09/2005 | CN2683816Y Valveless hydraulic drill |
| 03/01/2005 | US6860340 Rock drilling machine |
| 02/23/2005 | CN1190585C Down-the-hole hammer percussion static-pressure cased-drilling method for unconsolided and broken formation |
| 02/17/2005 | DE10333799B3 Hohlkolbenschlagwerk mit Luftausgleichs- und Leerlauföffnung Hollow piston hammer with Luftausgleichs- and idle opening |
| 02/15/2005 | US6854538 Rock drill |
| 02/09/2005 | CN2677577Y Large pneumatic drill hammer |
| 02/09/2005 | CN1576468A 击打力发生器 Striking force generator |
| 02/03/2005 | WO2005009688A2 Hollow piston hammer device with air equilibration and idle openings |
| 01/26/2005 | CN1571713A Method and apparatus for monitoring operation of percussion device |
| 01/19/2005 | CN2672272Y Slide sleeve type earth quake drill power head |
| 01/18/2005 | US6843331 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| 01/04/2005 | CA2097479C Hammer device |
| 12/30/2004 | DE102004024154A1 Hammer Hammer |
| 12/22/2004 | EP1488072A1 A method for applying an anti-corrosion coating to especially corrosion exposed parts in rock drill equipment |
| 12/15/2004 | EP1485567A2 Mono-diameter wellbore casing |
| 12/15/2004 | CN2663639Y Drilling tool for eccentric heel tube of down-the-hole hammer |
| 12/09/2004 | WO2004106942A2 Method for measuring fluid chemistry in drilling and production operations |
| 12/09/2004 | US20040245018 Electrically sequenced tractor |
| 12/09/2004 | US20040244493 Method and apparatus for monitoring operation of percussion device |
| 12/08/2004 | CN2661899Y Valve cap positioning mechanism of pneumatic crusher |
| 12/01/2004 | CN2660124Y Pickaxe/spade for digging hard soil |
| 11/25/2004 | US20040231869 Hammer |
| 11/18/2004 | US20040226752 Impact device |
| 11/11/2004 | WO2004072430A3 Pneumatic perforator with independent rotation of the drill |
| 11/11/2004 | WO2004065750A3 Multiple dispensing check valve delivery system |
| 11/03/2004 | CN2653108Y Novel airleg rock drill |
| 10/20/2004 | CN2649762Y Fully-hydraulic impact reverse-circulating drilling machine |
| 10/20/2004 | CN2649761Y Impact mechanism for hydraulic cylinder |
| 10/14/2004 | WO2003071086B1 Mono-diameter wellbore casing |
| 09/30/2004 | WO2004057147A3 Tensioning system for production tubing in a riser at a floating installation for hydrocarbon production. |
| 09/29/2004 | EP1461187A1 Method and apparatus for monitoring operation of percussion device |
| 09/29/2004 | CN1168888C Well drilling machine with shocking, grabbing, spading, planing and drilling heads |
| 09/22/2004 | EP1458949A2 Rotary support table |
| 09/16/2004 | WO2004079145A2 Method for drilling and completing wells |
| 09/10/2004 | WO2004005661B1 System and mehtod for automating or metering fluid recovered at a well |
| 09/08/2004 | EP1454028A2 Proppant recovery system |
| 09/01/2004 | CN1164857C Nitrogen explosion type hydraulic impactor possessing improved oil back flow storage cavity |
| 09/01/2004 | CN1164836C Impact hammer system and method for driving slender element into underground |
| 08/26/2004 | WO2004072430A2 Pneumatic perforator with independent rotation of the drill |
| 08/25/2004 | CN2635888Y Pneumatic mechanism for pneumatic rock drilling crawler |
| 08/19/2004 | WO2004070161A1 Drill column |
| 08/18/2004 | CN1522334A 冲击设备 The impact of equipment |
| 08/11/2004 | CN2632285Y Vibrating gravel drilling machines |
| 08/11/2004 | CN2632284Y Liftable gravel drilling machine |
| 08/05/2004 | WO2004065750A2 Multiple dispensing check valve delivery system |
| 08/05/2004 | WO2004046494A3 Method using particulate chelates to stimulate production of petroleum in carbonate formations |
| 08/05/2004 | WO2004044366A3 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| 08/05/2004 | WO2004033840A3 Methods and apparatus for open hole drilling |
| 08/05/2004 | WO2003104603A3 New and improved method and apparatus involving an integrated or otherwise combined exit guide and section mill for sidetracking or directional drilling from existing wellbores |
| 08/05/2004 | US20040149436 System and method for automating or metering fluid recovered at a well |
| 08/04/2004 | CN2630461Y Special thin percussion grooving apparatus |
| 08/04/2004 | CN2630460Y Lever assistor for drilling machine |
| 08/04/2004 | CN2630459Y Chain impact converter for percussion drill |
| 08/04/2004 | CN2630458Y Power head output buffering torque-transmission for engineering drilling machine |
| 07/29/2004 | US20040144566 Boring apparatus |
| 07/28/2004 | CN2628705Y Hammering drilling machine |
| 07/28/2004 | CN1159512C Rock drill and its quarrying hole-forming method using the same |
| 07/22/2004 | WO2004060617A1 Rock drilling machine and axial bearing |
| 07/22/2004 | WO2004005661A3 System and mehtod for automating or metering fluid recovered at a well |
| 07/22/2004 | WO2003071086A3 Mono-diameter wellbore casing |
| 07/21/2004 | CN2627189Y Supporting leg form fluid-power drill |
| 07/08/2004 | WO2004057147A2 Tensioning system for production tubing in a riser at a floating installation for hydrocarbon production. |
| 07/08/2004 | WO2003060280A3 Rotary support table |
| 06/23/2004 | EP1076758B1 A method for the formation of a plug in a petroleum well |
| 06/17/2004 | US20040112649 Rock drill |
| 06/15/2004 | US6749031 Drilling system |
| 06/10/2004 | WO2004003331A3 Non-corrosive amphoteric surfactants and method of well treatment |
| 06/08/2004 | US6745854 Electrically sequenced tractor |
| 06/08/2004 | US6745853 Methods and apparatus for open hole drilling |
| 06/03/2004 | WO2004046494A2 Method using particulate chelates to stimulate production of petroleum in carbonate formations |
| 05/27/2004 | WO2004044366A2 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| 05/27/2004 | US20040099442 Method for rock-chiseling |
| 05/20/2004 | US20040098202 Method for measuring fluid chemistry in drilling and production operations |
| 05/05/2004 | CN2614256Y Portable hand held pneumatic rock drill |