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)
03/2003
03/20/2003US20030051918 Roller-cone bits, systems, drilling methods, and design methods with optimization of tooth orientation
03/20/2003US20030051917 Roller cone bits, methods, and systems with anti-tracking variation in tooth orientation
03/20/2003DE20219712U1 Earth cutting drill has two radially opposed cutting edges with close-arrayed centre teeth
03/20/2003DE20215147U1 Pilot hole cutter for small bore tunnel has hydraulic jet cutting head
03/19/2003EP1292754A2 Centraliser
03/19/2003EP0944764B1 Drilling head
03/19/2003CN2540493Y Chisel teeth with double crest of tooth
03/18/2003US6533052 Drill bit for impact-assisted directional boring
03/18/2003US6533051 Roller cone drill bit shale diverter
03/18/2003US6533050 Excavation bit for a drilling apparatus
03/13/2003US20030047622 Cavitating jet
03/12/2003CN2539830Y Single roller bit with intermittent and pulsating jet flow function
03/11/2003US6530441 Cutting element geometry for roller cone drill bit
03/06/2003US20030042049 Roller cone bits with reduced packing
03/05/2003EP1288432A1 Drill bit with PDC cutters with different backrake angles
03/05/2003EP1287228A1 Wellbore liner system
03/05/2003EP0815340B1 Rock drilling tool, drill bit and a method of transferring percussive energy
03/05/2003CN1401044A Drill bit, hard member, and bit body
03/04/2003US6527633 Abrasive body
03/04/2003US6527069 Superabrasive cutter having optimized table thickness and arcuate table-to-substrate interfaces
03/04/2003US6527068 Roller cone drill bit having non-axisymmetric cutting elements oriented to optimize drilling performance
03/04/2003US6527066 Hole opener with multisized, replaceable arms and cutters
03/04/2003US6527065 Superabrasive cutting elements for rotary drag bits configured for scooping a formation
02/2003
02/27/2003US20030037964 Rotary drill bits exhibiting cutting element placement for optimizing bit torque and cutter life
02/27/2003US20030037640 Polycrystalline diamond partially depleted of catalyzing material
02/27/2003DE20219563U1 Double cutting drill, has intermediate spiral starting at leading reinforcing part at axial height of hard metal plate
02/26/2003EP1285145A1 Apparatus for directional drilling
02/26/2003EP0944765B1 Drilling and/or coring tool
02/25/2003US6523624 Sectional drive system
02/20/2003WO2002061234B1 Replaceable drill bit assembly
02/20/2003WO2002002902B1 Improved rolling cutter lubrication arrangement
02/20/2003US20030035958 Polycrystalline diamond partially depleted of catalyzing material
02/20/2003US20030035957 Polycrystalline diamond partially depleted of catalyzing material
02/20/2003US20030034182 Polycrystalline diamond partially depleted of catalyzing material
02/20/2003US20030034181 Bearing elements for drill bits, drill bits so equipped, method of drilling and method of drill bit design
02/20/2003US20030034180 PDC drill bit having cutting structure adapted to improve high speed drilling performance
02/20/2003US20030034179 Bowed crests for milled tooth bits
02/20/2003US20030034176 Cutting structure for roller cone drill bits
02/19/2003EP1283936A1 Cutting tool and method of using same
02/19/2003EP1283935A1 Rock drill
02/19/2003CN2536763Y Backcycling well stone-crushing drill
02/18/2003US6521174 Selectively thinning the carbide substrate subsequent to a high-temperature, high-pressure sinter and anneal
02/16/2003CA2398412A1 Bowed crests for milled tooth bits
02/15/2003CA2397436A1 Pdc drill bit having cutting structure adapted to improve high speed drilling performance
02/13/2003WO2003012244A1 Drill crown
02/13/2003WO2002044508A3 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium
02/13/2003US20030029645 Rock bit seal with extrusion prevention member
02/13/2003US20030029644 Advanced expandable reaming tool
02/13/2003US20030029643 Segment for a core drill bit and method of manufacture
02/13/2003US20030029642 Drill bits with reduced exposure of cutters
02/12/2003EP1283324A2 Expandable reaming tool
02/12/2003EP1210497A4 Bit connector
02/12/2003EP1070194B1 A mill and a method for milling
02/12/2003CN2535542Y Self-aligning diamond composite-piece drilling bit
02/12/2003CN1396981A Replaceable drill bit assembly
02/11/2003US6517902 Methods of treating preform elements
02/11/2003US6516903 Drill bit stabilizer device
02/11/2003US6516899 Method and apparatus for directional boring under mixed conditions
02/08/2003CA2397110A1 Advanced expandable reaming tool
02/06/2003WO2003010410A1 Injecting a fluid into a borehole ahead of the bit
02/06/2003WO2003010409A1 Drilling tool
02/06/2003US20030024743 Dual dynamic rotary seal
02/06/2003US20030024741 Drill bit and method for directional drilling in cobble formations
02/06/2003US20030024739 Method and apparatus for directional boring under mixed conditions
02/06/2003DE20218345U1 Hand drilling machine has housing on which rear hand grip is fitted and accommodation for earth drill driven by internal combustion engine in housing
02/04/2003USRE37975 Directional boring head with blade assembly
02/04/2003US6516293 Method for simulating drilling of roller cone bits and its application to roller cone bit design and performance
02/04/2003US6513608 Cutting elements with interface having multiple abutting depressions
02/04/2003US6513607 Metal-face-seal rock bit
02/04/2003US6513601 Method for setting a packer in a well bore, and a packer
02/04/2003US6513598 Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks
01/2003
01/30/2003WO2003008754A1 Steerable rotary drill bit assembly with pilot bit
01/30/2003US20030021995 Applying an aqueous slurry comprising lithium silicate, sodium silicate, potassium silicate, zirconia powder, a fibrous agent, and a magnetic powder to a surface, drying, heat curing
01/30/2003US20030019667 Rock drill
01/30/2003US20030019666 Dual-seal drill bit pressure communication system
01/30/2003US20030019333 Method of manufacturing PDC cutter with chambers or passages
01/29/2003EP1279793A1 Drill head
01/29/2003CN2533251Y Composite double-functional drill bit
01/28/2003US6510910 Unplanar non-axisymmetric inserts
01/28/2003US6510909 Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty
01/28/2003US6510907 Abrasive jet drilling assembly
01/28/2003US6510906 Impregnated bit with PDC cutters in cone area
01/23/2003WO2003006791A1 Rolling rock cutters
01/23/2003WO2003006785A1 Soil excavating tool, swivel, connecting device, and ground improving method
01/22/2003EP1277887A2 Displacement drilling tool and equipment using said tool
01/22/2003EP1276954A1 Expandable bit
01/22/2003EP1276953A1 Expandable apparatus for drift and reaming a borehole
01/22/2003CN1392326A Rock drill
01/21/2003US6508318 Percussive rock drill bit and buttons therefor and method for manufacturing drill bit
01/16/2003WO2003004825A1 Well drilling bit
01/16/2003WO2003004824A1 Earth drilling device
01/16/2003US20030010538 Earth borer
01/16/2003US20030010532 Drill bit having adjustable total flow area
01/16/2003CA2353160A1 Robotic proboscis pipeline apparatus
01/15/2003EP1275815A1 Drill Bit Having Adjustable Total Flow Area
01/15/2003CN1391011A Method and apparatus for forming shaped pile by drilling, high-pressure letting to enlarge hole and pressure pouring of concrete
01/15/2003CN1098740C 钻孔工具 Drilling Tools
01/14/2003CA2106074C Masonry coring system
01/09/2003US20030008160 Rod; coated fiber bundles; hard core, ductile surfaces
01/08/2003EP1272731A1 Drillable drill bit nozzle
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