US Patent No: 5,244,039

Number of patents in Portfolio can not be more than 2000

Rotary drill bits

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A rotary drill bit for drilling holes in subsurface formations comprises a bit body having a shank for connection to a drill string, a plurality of preform primary cutting elements mounted on the bit body and defining a primary cutting profile having a downwardly convex nose portion. There are associated with at least certain of the primary cutting elements respective secondary elements which are spaced inwardly of the primary profile. The distance of the secondary elements from the primary profile, when measured in a direction perpendicular to said profile, is generally greater for secondary elements nearer the nose portion than it is for secondary elements further away from the nose portion, and is preferably such that the vertical distance of the secondary elements from the profile is substantially constant.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CAMCO DRILLING GROUP LIMITEDSTONEHOUSE8

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Clegg, John M Redland, GB2 10 476
Newton, Jr Thomas A Harris County, TX 7 345

Cited Art

Patent Info (Count) # Cites Year
 
DRESSER INDUSTRIES, INC. (3)
4,429,755 Drill with polycrystalline diamond drill blanks for soft, medium-hard and hard formations 30 1981
4,475,606 Drag bit 29 1982
4,545,441 Drill bits with polycrystalline diamond cutting elements mounted on serrated supports pressed in drill head 46 1984
 
REEDHYCALOG UK LTD. (2)
4,889,017 Rotary drill bit for use in drilling holes in subsurface earth formations 149 1988
4,942,933 Relating to rotary drill bits 22 1988
 
REEDHYCALOG, L.P. (2)
4,718,505 Rotary drill bits 47 1985
4,823,892 Rotary drill bits 26 1987

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
BAKER HUGHES INCORPORATED (19)
6,125,947 Earth-boring drill bits with enhanced formation cuttings removal features and methods of drilling 1 1997
6,298,930 Drill bits with controlled cutter loading and depth of cut 58 1999
6,250,408 Earth-boring drill bits with enhanced formation cuttings removal features 1 2000
6,230,827 Earth-boring drill bits with enhanced formation cuttings removal features and methods of drilling 0 2000
6,408,958 Superabrasive cutting assemblies including cutters of varying orientations and drill bits so equipped 59 2000
6,460,631 Drill bits with reduced exposure of cutters 46 2000
6,659,199 Bearing elements for drill bits, drill bits so equipped, and method of drilling 13 2001
6,779,613 Drill bits with controlled exposure of cutters 36 2002
6,935,441 Drill bits with reduced exposure of cutters 25 2004
7,360,608 Rotary drill bits including at least one substantially helically extending feature and methods of operation 10 2004
7,096,978 Drill bits with reduced exposure of cutters 20 2005
7,814,990 Drilling apparatus with reduced exposure of cutters and methods of drilling 2 2006
8,141,665 Drill bits with bearing elements for reducing exposure of cutters 2 2006
7,814,997 Interchangeable bearing blocks for drill bits, and drill bits including same 4 2007
8,011,275 Methods of designing rotary drill bits including at least one substantially helically extending feature 0 2008
8,087,478 Cutting elements including cutting tables with shaped faces configured to provide continuous effective positive back rake angles, drill bits so equipped and methods of drilling 0 2009
8,327,957 Downhole cutting tool having center beveled mill blade 0 2010
8,066,084 Drilling apparatus with reduced exposure of cutters and methods of drilling 0 2010
8,172,008 Drilling apparatus with reduced exposure of cutters and methods of drilling 0 2011
 
SMITH INTERNATIONAL, INC. (7)
5,505,273 Compound diamond cutter 10 1994
5,582,261 Drill bit having enhanced cutting structure and stabilizing features 36 1994
5,549,171 Drill bit with performance-improving cutting structure 54 1994
6,564,886 Drill bit with rows of cutters mounted to present a serrated cutting edge 17 2000
7,703,557 Fixed cutter bit with backup cutter elements on primary blades 6 2007
7,621,348 Drag bits with dropping tendencies and methods for making the same 11 2007
8,100,202 Fixed cutter bit with backup cutter elements on secondary blades 6 2009
 
REEDHYCALOG UK LTD. (4)
5,671,818 Rotary drill bits 14 1995
5,904,213 Rotary drill bits 14 1997
5,819,860 Rotary drill bits 6 1997
6,123,161 Rotary drill bits 32 1997
 
CAMCO INTERNATIONAL (UK) LIMITED (3)
6,092,613 Rotary drill bits 19 1998
5,992,547 Rotary drill bits 83 1998
5,967,246 Rotary drill bits 24 1998
 
SHELL OIL COMPANY (3)
7,726,419 Drill bit, system, and method for drilling a borehole in an earth formation 0 2004
7,455,126 Percussive drill bit, drilling system comprising such a drill bit and method of drilling a bore hole 1 2004
7,546,888 Percussive drill bit 1 2004
 
HALLIBURTON ENERGY SERVICES, INC. (2)
6,302,224 Drag-bit drilling with multi-axial tooth inserts 37 1999
6,283,233 Drilling and/or coring tool 27 1999
 
REEDHYCALOG, L.P. (2)
5,803,196 Stabilizing drill bit 26 1996
5,816,346 Rotary drill bits and methods of designing such drill bits 17 1996
 
VAREL INTERNATIONAL IND., L.P. (2)
6,450,270 Rotary cone bit for cutting removal 14 2000
8,327,944 Whipstock attachment to a fixed cutter drilling or milling bit 0 2010
 
MICROSOFT CORPORATION (1)
5,537,628 Method for handling different code pages in text 22 1994
 
TOTAL FRANCE (1)
5,957,227 Blade-equipped drilling tool, incorporating secondary cutting edges and passages designed for the removal of evacuated material 14 1997
 
VAREL INTERNATIONAL, INC. (1)
6,568,492 Drag-type casing mill/drill bit 26 2001
 
WEATHERFORD/LAMB, INC. (1)
7,108,064 Milling tool insert and method of use 1 2003
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
8,439,136 Drill bit for earth boring 0 2010