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)
05/2003
05/29/2003US20030098182 Mini disk bit
05/28/2003EP1314850A1 A masonry drill bit
05/28/2003CN2553091Y Mud drum-preventing downhole tool
05/27/2003US6568492 Drag-type casing mill/drill bit
05/27/2003US6568491 Method for applying hardfacing material to a steel bodied bit and bit formed by such method
05/27/2003US6568490 Method and apparatus for fabricating rotary cone drill bits
05/27/2003US6568488 Roller pipe burster
05/22/2003WO2003042492A1 An improved transmission sleeve
05/22/2003WO2003042491A1 Fluid drilling head
05/22/2003US20030094766 Bearing seal
05/22/2003US20030094730 Method and fabricating tools for earth boring
05/22/2003US20030094308 Boring device and boring method
05/20/2003US6564887 Core drill
05/20/2003US6564886 Drill bit with rows of cutters mounted to present a serrated cutting edge
05/20/2003US6564884 Wear protection on a rock bit
05/16/2003CA2411594A1 Bearing seal
05/16/2003CA2411548A1 Breakable washer earth boring bit
05/15/2003US20030089528 Flightless rock auger for use with pressure drills with quick attachment and method of use
05/15/2003US20030089527 Apparatus and method for directional drilling of holes
05/15/2003US20030089525 Hole-boring method and system for making cast-in-situ piles
05/14/2003EP1310600A1 Drilling apparatus and method
05/14/2003CN2550478Y Shell type dril bit
05/14/2003CN1417448A Hole drilling equipment and method
05/13/2003US6562462 High volume density polycrystalline diamond with working surfaces depleted of catalyzing material
05/13/2003US6561293 Cutter element with non-linear, expanded crest
05/13/2003US6561292 Rock bit with load stabilizing cutting structure
05/13/2003US6561291 Roller cone drill bit structure having improved journal angle and journal offset
05/13/2003US6561286 Well bore reamer and method
05/13/2003US6561285 Breaking apparatus and tool
05/08/2003US20030084894 Brazed diamond tools and methods for making the same
05/07/2003EP1307630A1 Drilling apparatus
05/07/2003CN2549159Y Multi-edge alloy cutting tooth
05/07/2003CN2549158Y Spiral diameter retainng tricone bit
05/07/2003CN2549157Y Diameter retaining structure of zublin simplex bit
05/07/2003CN2549156Y Zublin simplex bit with certralizing ability
05/07/2003CN2549155Y Drill bit for catching broken casing
05/07/2003CN1416498A Drill bit
05/07/2003CN1416497A Method and appts. for directional boring under mixed conditions
05/07/2003CN1107565C Composite cermet articles and method of making
05/06/2003US6557653 Working tool for a percussion power tool
05/02/2003EP1306517A1 Method and system for drilling when forming concrete piles
05/02/2003EP1306516A1 Drilling and pressing tool
05/02/2003EP0906488B1 Cutting tool for use in a wellbore
05/01/2003WO2003036025A1 System for lining a section of a wellbore
05/01/2003WO2003036014A1 Disengagable reamer
05/01/2003US20030079918 Method for forming cutting elements
05/01/2003US20030079917 Asymmetric compact for drill bit
05/01/2003US20030079916 Protective overlay coating for PDC drill bits
05/01/2003US20030079915 Device for drilling, in particular percussion drilling or rotary percussion drilling, boreholes
05/01/2003US20030079913 Apparatus and method for drilling and reaming a borehole
05/01/2003US20030079565 Hardfacing composition for rock bits
04/2003
04/30/2003CN2547860Y New-type drill bit to drill rock blasthole
04/24/2003US20030077134 Drilling tool
04/24/2003US20030075364 Reamer shoe
04/24/2003US20030075363 PCD face seal for earth-boring bit
04/24/2003US20030075334 Wellbore liner system
04/23/2003EP1015180A4 Abrasive tools with patterned grit distribution and method of manufacture
04/23/2003EP0833999B1 A cutter, a stopper means and a method of preventing mud from entering into a cutter
04/22/2003US6550556 Ultra hard material cutter with shaped cutting surface
04/17/2003WO2003031763A1 System for rotary-percussion drilling in an earth formation
04/17/2003WO2002092957A3 Drill bit
04/17/2003US20030072669 Method of forming polycrystalline diamond cutters having modified residual stresses
04/16/2003EP1302621A1 Drill bit for very hard materials
04/16/2003EP1302290A1 Drilling tool
04/16/2003EP0958446B1 Method and device for driving bore-holes, specially for prospection and extraction drillings
04/15/2003US6547017 Rotary drill bit compensating for changes in hardness of geological formations
04/15/2003US6547006 Wellbore liner system
04/10/2003WO2003029604A1 Prevention of bit balling by metallic coasting
04/10/2003US20030068209 Drilling head
04/10/2003US20030066391 Cone erosion protection for roller cone drill bits
04/10/2003DE19932440C2 Bohrzahn zur Erdbearbeitung Drilling tooth for Erdbearbeitung
04/10/2003DE10155105C1 Earth drill with pipe line installer has frame supporting hollow drill shaft with flushing pipes
04/09/2003CN1408982A Method and equipment for drilling large bore well (hole) using small size screw drill tool combination
04/08/2003US6544308 High volume density polycrystalline diamond with working surfaces depleted of catalyzing material
04/08/2003US6543312 Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations
04/05/2003CA2394212A1 Rotary cone bit with improved thrust bearing
04/03/2003US20030062201 Gage trimmers and bit incorporating the same
04/03/2003US20030062200 Pressure relief system
04/03/2003US20030062197 Roller cone drill bit having lubrication contamination detector and lubrication positive pressure maintenance system
04/02/2003EP1297242A1 Drill bits
04/02/2003EP1296792A1 Perforating drill
04/02/2003EP0960261B1 Tool and method for drilling a lateral well
04/02/2003EP0960260B1 Tool for making an opening in a tubular in a wellbore
04/02/2003CN2542819Y Combination cone single-roller bit
04/02/2003CN2542818Y Roller bit with oblique steel teeth
04/01/2003US6540033 Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations
04/01/2003CA2105310C Cutting composite formed of cemented carbide substrate and diamond layer
03/2003
03/27/2003WO2003025337A1 Striking train for a ground-boring machine
03/27/2003WO2003025330A2 Liquid seal for wet roof bit
03/27/2003WO2003025327A1 Percussion drilling head
03/27/2003US20030056991 Apparatus and method for simultaneous drilling and casing wellbores
03/26/2003EP1296018A2 Lining a lateral wellbore
03/26/2003CN2541598Y Pore-forming drill of large diameter pile foundation engineering moving as epicyclic motion
03/26/2003CN1406309A Rock drill bit and method for its manufacturing
03/25/2003US6536543 Rotary drill bits exhibiting sequences of substantially continuously variable cutter backrake angles
03/25/2003US6536542 Rock bit seal with multiple dynamic seal surface elements
03/20/2003US20030051924 Insert chip of oil-drilling tricone bit, manufacturing method thereof and oil-drilling tricone bit
03/20/2003US20030051922 Secondary cutting structure
03/20/2003US20030051921 Optimized earth boring seal means
03/20/2003US20030051920 Liquid seal for wet roof bit
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