Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 10 - Drill bits
Patents for E21B 10 - Drill bits (19,464)
11/2000
11/23/2000WO2000012860A9 Roller-cone bits, systems, drilling methods, and design methods with optimization of tooth orientation
11/22/2000EP0960254A4 Reverse circulation drilling system with bit locked underreamer arms
11/22/2000CN1274041A Roller bit with solid lubricant layer
11/22/2000CN1058649C Method for mfg. cylinder tooth bit of cast steel and ductile iron
11/21/2000US6150822 Sensor in bit for measuring formation properties while drilling
11/21/2000US6148938 Wear resistant cutter insert structure and method
11/21/2000US6148937 PDC cutter element having improved substrate configuration
11/21/2000US6148936 Methods of manufacturing rotary drill bits
11/21/2000US6148935 Joint for use in a directional boring apparatus
11/21/2000US6148933 Steering device for bottomhole drilling assemblies
11/21/2000CA2132283C Drill bit inserts enhanced with polycrystalline diamond
11/15/2000EP1052367A2 Preform cutting elements for rotary drill bits
11/15/2000EP1051561A1 Rotary cone drill bit with enhanced thrust bearing flange
11/15/2000CN2406054Y Drill-bit of wall-making groover
11/14/2000US6145608 Superhard cutting structure having reduced surface roughness and bit for subterranean drilling so equipped
11/14/2000US6145607 Preform cutting elements for rotary drag-type drill bits
11/14/2000US6145606 Cutting insert for roof drill bit
11/14/2000US6145605 Rotary drill bit and roller cutter for rock drilling
11/09/2000WO2000066872A1 Abrasive jet drilling assembly
11/08/2000EP1050662A2 Rock drilling tool
11/08/2000CN2404999Y Roller cone bit
11/08/2000CN2404618Y Multi-purpose drilling bit
11/07/2000US6142250 Rotary drill bit having moveable formation-engaging members
11/07/2000US6142249 Earth-boring bit with improved bearing seal
11/07/2000US6142248 Reduced erosion nozzle system and method for the use of drill bits to reduce erosion
11/07/2000US6142247 Biased nozzle arrangement for rolling cone rock bits
11/02/2000EP1047858A1 Inserts and compacts having coated or encrusted diamond particles
11/02/2000EP1047857A1 Rock drilling tool
11/02/2000EP1047809A1 Hardfacing having coated ceramic particles or coated particles of other hard materials
10/2000
10/31/2000US6138780 Drag bit with steel shank and tandem gage pads
10/31/2000US6138779 Hardfacing having coated ceramic particles or coated particles of other hard materials placed on a rotary cone cutter
10/31/2000US6138778 Rock bit lubricant relief valve
10/25/2000CN2402793Y Petroleum and natural gas drilling bit
10/25/2000CN2402792Y PDC bit for drilling small borehole
10/25/2000CN2402791Y Diamond bit
10/25/2000CN1270882A Rock drill
10/25/2000CN1057798C Laser surface treating technology for cone bit leg axial journal
10/24/2000US6135219 Earth-boring bit with super-hard cutting elements
10/24/2000US6135218 Fixed cutter drill bits with thin, integrally formed wear and erosion resistant surfaces
10/19/2000WO2000061877A1 Bearing capacity enhancement for piling applications
10/19/2000DE19916975A1 Gesteinsbohrer Rock drill
10/18/2000EP1045112A1 Masonry drill
10/18/2000CN1270655A Reverse circulation drilling system with bit locked underreamer arms
10/17/2000US6132149 Twist drills
10/17/2000US6131678 Preform elements and mountings therefor
10/17/2000US6131677 Steel-bodied bit
10/17/2000US6131676 Small disc cutter, and drill bits, cutterheads, and tunnel boring machines employing such rolling disc cutters
10/17/2000US6131675 Combination mill and drill bit
10/15/2000CA2305831A1 Tooth type drill bit with secondary cutting elements and stress reducing tooth geometry
10/11/2000EP0795073A4 Rotary cone drill bit and method for enhanced lifting of fluids and cuttings
10/10/2000US6129163 Flightless rock auger with quick attachment and method of use
10/10/2000US6129162 Rock drill
10/10/2000US6129161 Rotary drill bits with extended bearing surfaces
10/05/2000WO2000058595A1 Reaming stabiliser roller
10/05/2000DE19914522A1 Breaking tool has chisel shaft, hexagonal basic body, chisel point, outer chisel surfaces with grooves
10/04/2000CN1269003A Method and apparatus for cleaning public pipeline and then changed with polyolefin pipeline
10/04/2000CN1268992A Roller cone drill bit with lubricant pressure compensating device
10/04/2000CN1268991A Drill bit
10/03/2000US6126709 Tungsten carbide(wc) with a binder phase of cobalt or cobalt and nickel, up to 2% of the total carbide of rare earth metals, the wc grains being rounded and of given maximum grain size; for rock excavation
10/03/2000US6125952 Percussive down-the-hole hammer and a drill bit therefor
10/03/2000US6125950 Collared boring bit
10/03/2000US6125947 Earth-boring drill bits with enhanced formation cuttings removal features and methods of drilling
10/03/2000US6125786 Underground warning system for underground conduits or pipes
09/2000
09/28/2000WO2000057019A1 Device for drilling bore holes
09/27/2000EP1039095A2 Downhole drill bit
09/27/2000EP1039094A1 Roller drill bit with sealing device
09/27/2000CN1268189A A rotary earth strata penetrating tool with a cermet insert having a Co-Ni-Fe binder
09/27/2000CN1056900C 岩石钻 Rock drill
09/26/2000US6123337 Composite earth boring bit seal
09/26/2000US6123161 Rotary drill bits
09/26/2000US6123160 Drill bit with gage definition region
09/26/2000CA2302406A1 Drilling head with a cone rock bit
09/21/2000WO2000055467A1 Method and apparatus for directional boring
09/21/2000CA2366115A1 Method and apparatus for directional boring
09/20/2000EP1036913A1 A method of applying a wear--resistant layer to a surface of a downhole component
09/19/2000US6119798 Rock drill bit and cutting inserts
09/19/2000US6119797 Single cone earth boring bit
09/19/2000US6119787 Auger planting tool
09/14/2000WO2000053887A2 Wellbore primary barrier and related systems
09/13/2000EP1034354A1 Mill for use in a wellbore and method of milling
09/13/2000EP0741834B1 System, method and cutterhead for dry full-area drilling
09/12/2000US6116827 Drilling tool
09/12/2000US6116361 Boring tool
09/12/2000US6116360 Methods of manufacturing rotary drill bits
09/12/2000US6116359 Tri-cone kerf gage
09/12/2000US6116357 Rock drill bit with back-reaming protection
09/12/2000US6116356 Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter
09/12/2000US6116355 Choke device
09/12/2000CA2143349C Flow control sub for hydraulic expanding downhole tools
09/08/2000WO2000052377A1 Reverse circulation drilling system with hexagonal pipe coupling
09/08/2000WO2000052295A1 Roller cone bit with improved seal gland design
09/06/2000EP0796385A4 Rotary cone drill bit with angled ramps
09/06/2000EP0775247A4 Rock bit with enhanced fluid return area
09/06/2000EP0775246A4 Rotary cone drill bit with improved support arms
09/05/2000US6113195 Rotatable cutting bit and bit washer therefor
09/05/2000US6112836 Rotary drill bits employing tandem gage pad arrangement
09/05/2000US6112835 Drilling apparatus having a radially displaceable reamer
09/05/2000US6112833 Bore hole drilling device
09/05/2000US6112812 Wellbore milling method
08/2000
08/31/2000WO2000050738A1 Advancing device for boring sections of roadway, tunnels or similar
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