| Patents for E21B 3 - Rotary drilling (4,061) |
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| 03/06/2008 | WO2008028075A2 Method and system for managing a drilling operation in a multicomponent particulate system |
| 03/06/2008 | WO2008026974A1 A drilling machine for making holes in building structures comprising a gear box with different gear ratios |
| 03/06/2008 | US20080059073 Methods and apparatus for handling and drilling with tubulars or casing |
| 03/06/2008 | US20080053676 Electric Hand Held Tool Device |
| 03/06/2008 | CA2659594A1 Method and system for managing a drilling operation in a multicomponent particulate system |
| 03/05/2008 | CN101135233A Hole digger |
| 03/05/2008 | CN101135171A Track-mounted electric rotary drill |
| 02/28/2008 | US20080047757 Method and device for producing a borehole in the soil |
| 02/28/2008 | US20080047749 Methods and apparatus for applying torque and rotation to connections |
| 02/27/2008 | CN201027873Y Oil cylinder using small thread to regulate brake clearance of brake clamp |
| 02/27/2008 | CN201027872Y Full hydraulic extension spring reset open oil cylinder with constant brake clearance |
| 02/27/2008 | CN201027871Y Open oil cylinder for hydraulic modulating and compensating cylinder stroke and modulating brake clearance |
| 02/27/2008 | CN101131091A Down-hole coal bed air-pressing helix drilling tools and drilling method using the same |
| 02/20/2008 | CN201024887Y An electric-driven top drive device with novel structure |
| 02/20/2008 | CN201024886Y A novel top drive device |
| 02/20/2008 | CN201024885Y A drive machine for petroleum driller |
| 02/20/2008 | CN201024884Y Micro portable driller for petroleum exploration |
| 02/20/2008 | CN101126302A Constant power variable speed variable twisting moment pneumatic boring device |
| 02/20/2008 | CN101126301A Petroleum drill low-voltage AC driving device |
| 02/13/2008 | CN201021601Y Mechanical and electrical integrated dynamic head driller |
| 02/13/2008 | CN201021600Y Hydraulic dynamic header driller |
| 02/12/2008 | US7328757 All terrain vehicle powered mobile drill |
| 02/12/2008 | CA2412694C Drill rod holder |
| 02/06/2008 | CN201016275Y Inclined surface rock drill |
| 02/06/2008 | CN201016272Y Inner sleeve circumflex type top driven drilling rig |
| 02/06/2008 | CN101117882A Electric rotary drilling rig power head |
| 02/06/2008 | CN100366861C Earthquake dry well drill |
| 02/05/2008 | US7325610 Methods and apparatus for handling and drilling with tubulars or casing |
| 01/30/2008 | CN201013814Y Open type oil cylinder of full hydraulic disc spring resetting constant braking inter space |
| 01/30/2008 | CN201013231Y Rat-hole drilling driving device for petroleum well drilling |
| 01/30/2008 | CN201013230Y Novel portable demodulator drilling machine |
| 01/30/2008 | CN201013229Y Ground anchor bearing hydraulic drilling working rig |
| 01/30/2008 | CN201013228Y Fully-hydraulic gas drainage multi-use drill |
| 01/30/2008 | CN201013019Y Pile machine with drilling function |
| 01/29/2008 | US7322418 Continuous circulation drilling method |
| 01/24/2008 | US20080017418 Boring System And Method Therefor |
| 01/23/2008 | CN201011296Y Motor vehicle carrier anchor rod drilling machine |
| 01/22/2008 | US7320374 Wellbore top drive systems |
| 01/16/2008 | CN201007183Y Novel oil-well rig compound gearing device |
| 01/16/2008 | CN101105112A Full hydraulic rock core drilling machine unit head |
| 01/09/2008 | CN201003370Y Hollow driller for ground |
| 01/09/2008 | CN201003369Y Hand-held automatic drilling device for water drilling |
| 01/01/2008 | US7314090 Automatic false rotary |
| 12/27/2007 | WO2007120059B1 Cutting, drilling or grinding apparatus and method |
| 12/26/2007 | CN101094966A Elevator for use in handling pipe and method for handling pipe |
| 12/21/2007 | WO2007144953A1 Device and method for digging cave and pit |
| 12/20/2007 | US20070289149 Mode selection mechanism for power tool and power tool incorporating such mechanism |
| 12/19/2007 | CN200992950Y Two-dimensional floating block for top driving drilling device |
| 12/19/2007 | CN101089356A Hollow motor directly driving top of drilling device |
| 12/18/2007 | US7308953 Mobile drilling rig |
| 12/18/2007 | US7308950 Drilling and/or hammering tool |
| 12/13/2007 | WO2007076403A3 Modular top drive |
| 12/12/2007 | CN101086205A Tunneling, anchoring and drilling composite machine |
| 12/05/2007 | CN200985745Y Vehicle mounted machine ground anchorage machine |
| 12/05/2007 | CN200985744Y Spiral drilling type rotary digging drill |
| 12/05/2007 | CN200985743Y Multifunctional rotary digging drill |
| 12/05/2007 | CN200985741Y Hollow motor directly driving top-drive drill means |
| 12/05/2007 | CN200985740Y Auxiliary handling device of mash gas pumping and discharged drill |
| 12/05/2007 | CN200985739Y Anchorage cable machine |
| 12/05/2007 | CN101082264A Multi-headed isopach deep agitation driller |
| 12/05/2007 | CN101082263A Anchor rod driller multiplication propulsion unit |
| 12/05/2007 | CN100353019C Mounts for blowout preventer bonnets |
| 11/28/2007 | CN200982154Y Self-walking type reverse circulation drill |
| 11/28/2007 | CN101078334A Well drilling top drive guide rail plate |
| 11/28/2007 | CN101078333A Well drilling top drive sliding fastening-change head |
| 11/22/2007 | WO2007024757A3 Remotely operable top drive system safety valve having dual valve elements |
| 11/22/2007 | US20070269281 Drill Bushing |
| 11/22/2007 | US20070267222 Low speed ac motor for direct drive applications |
| 11/22/2007 | DE102006022613A1 Drilling drive unit for propelling drill pipe, comprises drill pipe, adjustable between release position, in which fuse element is at distance from drill pipe, where drill pipe is positively contacted form-fit by fuse element |
| 11/21/2007 | CN200978621Y wheeled type spiral rotary drilling rig |
| 11/20/2007 | US7296623 Methods and apparatus for applying torque and rotation to connections |
| 11/15/2007 | WO2007129120A1 Method and apparatus for oscillating a drill string |
| 11/14/2007 | EP1853789A1 A method of geothermal loop installation |
| 11/14/2007 | CN200975217Y Canula drilling machine |
| 11/14/2007 | CN200975213Y Self-lubricating and sealed type slewing table apparatus |
| 11/14/2007 | CN200975212Y Apparatus for combine driving oil-well rig with electric motor and modulating velocity type hydraulic reduced speed correctitude vehicle tank |
| 11/14/2007 | CN200975211Y Telescopic thruster for digging drill carriage |
| 11/14/2007 | CN101070749A Perforating machine for drilling hole |
| 11/13/2007 | CA2401075C Wellbore circulation system |
| 11/08/2007 | WO2007125358A1 Seal assembly for use in a top drive |
| 11/08/2007 | WO2007125357A1 Top drive apparatus |
| 11/08/2007 | DE102006019261A1 Drilling device, especially for injection drilling in special underground workings, has support rope as guide for backstay and is connected to flushing head and to counterweight which is movably arranged on guide mast |
| 11/08/2007 | CA2718116A1 Top drive apparatus |
| 11/01/2007 | US20070251711 Toothed ring connecting structure of a power tool |
| 10/31/2007 | CN200968277Y Composite hydraulic energy-saving controller |
| 10/31/2007 | CN200968178Y Multifunctional rock boring machine |
| 10/31/2007 | CN200968176Y Drilling machine for piling |
| 10/25/2007 | WO2007120059A1 Cutting, drilling or grinding apparatus and method |
| 10/25/2007 | US20070246262 Earth drilling rig having electronically controlled air compressor |
| 10/24/2007 | CN200964859Y Tunneling, anchoring and drilling composite machine |
| 10/24/2007 | CN200964792Y Composite network electric driller drive |
| 10/24/2007 | CN200964791Y Electric driller drive |
| 10/24/2007 | CN200964790Y Hydraulic minisize drilling machine |
| 10/24/2007 | CN200964789Y Submersion type reverse circulation engineered drilling machine |
| 10/24/2007 | CN200964788Y Rock core drilling machine |
| 10/24/2007 | CA2585979A1 Worm and collar drive drill rig |
| 10/23/2007 | US7284617 Casing running head |
| 10/23/2007 | CA2191473C Top entry apparatus and method for a drilling assembly |
| 10/17/2007 | CN100343474C Washpipe assembly |
| 10/16/2007 | US7281591 Electrical connection for a power tool |