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Apparatus for drilling well boreholes

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Publication number
US2684835A
US2684835A US17593250A US2684835A US 2684835 A US2684835 A US 2684835A US 17593250 A US17593250 A US 17593250A US 2684835 A US2684835 A US 2684835A
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Prior art keywords
bit
drill
piston
drilling
force
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Expired - Lifetime
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Thomas V Moore
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Standard Oil Development Co
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Standard Oil Development Co
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods ; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/04Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07Telescoping joints for varying drill string lengths; Shock absorbers
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B44/00Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
    • E21B44/005Below-ground automatic control systems
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/18Drilling by liquid or gas jets, with or without entrained pellets

Description

y 27, 1954- I '1". v. MOORE- 2,634,835

. APPARATUS FOR DRILLING WELL BOREHOLES Filed July 26, 1950 I -i CYLIMD-QICAL.

- ELEMENT Q T Azme.

' Z PISTON HEAD 4 Poms FIQ-Q a 5 :DQIVE. BQSHIMG A Q, TOOL QJonuT E ox No'z'z-ha HyQQ Thomas V. Mo orc Unvemaor abtaorneq Patented July 27, 1954 APPARATUS FOR DRILLING WELL BOREHOLES Thomas V. Moore, Manhasset, N. Y., assignor to Standard Oil Develo ration of Delaware pment Company, a corpo- Application July 26, 1950, Serial No. 175,932

1 Claim. 1

The present invention is concerned with an improved apparatus for drilling well bore holes. The invention is particularly concerned with a novel bottom hole assembly by which it is possible to employ an improved method of exerting the necessary force on the bit during the drilling operation. In accordance with the present in vention the required force on the bit during a drilling operation is secured by utilization of the head of the drilling fluid within the drill stem. The art of drilling well bore holes into subterranean areas of the earth has been extensively developed. A wide variety of drilling bits, associated apparatus and various techniques have been utilized. However, conventional techniques for rotary drilling apply the required force to the bit by allowing the weight of the drill string to partially rest on the bit. This process while entirely satisfactory has a number of inherent difiiculties. For example, part of the drill pipe may be in compression resulting in buckling of the pipe which in instances causes the hole to deviate from the vertical. Furthermore, the stress induced due to the buckling and unbuckling oi the compressed pipe results in corrosion fatigue. To reduce this difiiculty, drill collars, which are heavy lengths of pipe, are used. These are expensive, and are subject to frequent failures. Another disadvantage is that the friction against the walls of the hole causes the drill pipe to Wind up with the result that a substantial amount of bouncing of the bit occurs on the bottom of the hole. This aggravates the wearing of the cutter hearings in rock bits. It has now been discovered that these disadvantages are overcome providing the force on the bit is secured by a method other than by allowing the weight of the drill string to partially rest on the bit. The improved method of the present inven tion is secured by utilizing a novel bit assembly wherein the force on the bit is secured by the utilization of the head of the drilling fluid in the drill stem.

The present invention may be readily understood by reference to the drawing illustrating one embodiment of the same. Figure 1 of the drawing illustrates the apparatus of the present invention attached to the lower end of a drill string disposed in the earths substrata in a well bore. Figure 2 is a cross-sectional view taken along the line II-II of Figure 1. Referring specifically to the drawing the lower end of a drill string I is shown positioned within well bore hole 8. The bit assembly of the present invention is shown attached to the end of drill string l 0. The assembly comprises a cylindrical element l which contains positioned therein a piston assembly. The piston consists of a piston head 2 which contains suitable packing elements I to prevent the flow of fluid around the piston head. A piston rod 3 extends downwardly through a drive bushing 5 and contains at the lower end thereof a tool joint box 6 which contains attached thereto a suitable bit 9. Cylinder l contains ports 4 at the lower part permitting passage of fluid from the area between the well bore hole and the cylinder, and the area between the piston rod and the inner surface of the cylinder. The pressure below the piston is thus relieved, resulting in a net downward force on the piston. Nozzles I l are shown in the bit. A crosssection of the apparatus through section IIII is illustrated by Figure 2.

While the drawing has been described utilizing a drag or fishtail bit, it is to be understood that the present invention may be also utilized when employing other bits, as for example, rock bits and the various types of jet bits.

In operation the pressure of the mud or other drilling fluid on the piston exerts a force on the bit through the piston rod or lower Kelly joint. This joint, as shown in the cross section, Figure 2, is fluted or square in order that sufiicient torque may be applied to turn the bit. This permits the entire string of drill pipe to hang in tension. The control of the weight on the bit is secured first by the size of the nozzles in the bit and second by changes in the mud velocity.

This invention is particularly valuable when used with the so-called, jet bits which have recently been developed. These jets are designed with small nozzles through which an extremely high velocity mud stream is passed. Bits of this kind have been found to drill much faster and more economically than the conventional bits. In order to obtain the optimum mud velocities when using this type of bit, a pressure differential through the nozzle of several hundred pounds is commonly employed. Bits of this kind generally employ nozzles of from to 1" in diameter. In this invention, the nozzle diameter would be used as a major factor which would determine the weight to be carried on the bit. By way of example, suppose that the inside diameter of the cylinder were 6" and that it were desired to hold a force on the bit of 20,000 lbs, the cross-sectional area of the cylinder would be approximately 28 square inches and the pressure differential across the cylinder would be approximately 700 lbs. Assume that two nozzles are Force OnBit (Thousands of Lbs.)

Nozzle Diameter (each) (For 2 Nozzles) A 1% is g G. P. M. Mud Circulated:

The 6.'.-inside diameter cylinder would probably beused'when drillingholesof a diameter ofapproximately 9 inches. For drillinglarger diameter holes, it would bepossible to use a cylinder of largerdiameter and likewise smaller holes would demand that a smaller cylinder be used. The force on the bit,'of course, for a given rate of circulation and nozzle size will be directly proportionate to the cross-sectional area of the cylinder.

The-invention. is. broadly concerned with the utilization of theheadfof the drilling fluid Within thedrillv steinto secure the required force on the bitduring a drilling operation. The invention may be used'when. employing any type of bit but is particularlylefiective with jet bits, which bitsareedesigned with relatively small nozzles in order to secure ahigh velocity mud streamthroughthe bits Fromtheabove it is apparent that the specific drilling conditions employed .whenutilizingthe present invention will be a function of various related conditions, as for example, nozzle size; density. of the mud; the-rate otrnud circulation; and the diameter of the drilling-stemused. These factors vary ap preciablydependingupon the formation being penetrated;' the diameter of well bore hole desi.red,-as well as,.upon otherdrilling conditions. With other factorsmaintained constant, simple calculations'of the force. exerted on the bit assembly may be made bynoting that the pressure on the piston is roughly proportioned to the square of .the velocity ofv themud through the nozzles and inversely proportioned to the specific weight of the. mud. The nozzles diameters are generally in the range from about to l. The diameters, however, will vary depending upon the nozzles in the bit .whichusually vary from 2 to 4 The diameter of the drill string may vary from 2 to 7" and. higher, although usually the diameter is in the range from 4 to The density. ofv themud generally is in the range from 9. to 16--lbs..per gallon, although the density may, under certain conditions, be without this range. The quantity of mud circulated is usually in the range from 200 to 1000 gallons per minute. The desired force in the bit, likewise, may vary appreciably as for example in the range from 4,000 to 40,000 lbs. and higher.

A preferred method of operating infaccordance with the present 'inventiom is that the driller lowers the drill pipe until such time as a slight reduction in the reading of the weight indicator at thesurface-indicates that the weight of the drills'tring is resting in part on the lower Kelly joint. The driller then raises the drill string a small distance "which assures the driller that the weight of thedrill pipe is not resting on the bit. The drillerthen continues to drill in normal fashion tor-such length of time as the driller might expect is required to make an amount of hole somewhat less than the maximum stroke of the lower Kelly joint. This will vary from a few minutes to an hour'ortwo depending on the hardness of the formation being drilled and the progress being made. The driller then repeats the operation and in this way it is possible to makesure the-tithe drill pipe is always hanging in tension throughout its length and that the bit is'on .the'bottom with the weight required.

Having described the invention, it is claimed:

Improved'drill bit assembly adapted to be attached to the: lower endof adrill string comprising a cylindrical. element, the upper end of which is adapted to be attached to the lower end of saididrill string; a: drive bushing located within and attached to the lower end of said cylindrical element, apiston head element within and movable withrespect to-said cylindrical element above the said drive bushing, a piston rod elementattached to said piston head element, said piston rod element extending below the lower end of said cylindrical element and through said drive bushing, aplurality'ci ports passing through said cylindrical element immediately above the drive bushing, a drill bit characterized by'containing a plurality of restricted nozzle passageways attached to the lower end: of said piston rod element, said piston rod element being characterized by being hollowandpreviding a conduit from'the area above said piston head to said nozzle'passageways.

References Cited-in thefile or" this patent UNITED STATES PATENTS Number Name Date 1,357,554 Hughes Nov. 2, 1926 1,660,033 Braswell Feb. 21, 1928 1,686,945 Abercrombie Oct. 9, 1928 1,767,350 Crowell June 24, 1930 1,844,257 Lincoln Feb. 9, 1932 1,900,932 HolleStalle Mar. 14,1933 1,905,497 Peters Apr. 25, 1933 2,300,805 Pew Nov. 3,1942

US2684835A 1950-07-26 1950-07-26 Apparatus for drilling well boreholes Expired - Lifetime US2684835A (en)

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Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776817A (en) * 1952-07-21 1957-01-08 Shell Dev Drilling apparatus
US2819879A (en) * 1957-01-09 1958-01-14 J E Hill Suspension drilling device and jar
US2819878A (en) * 1956-09-24 1958-01-14 J E Hill Suspension drilling device and jar
US2883156A (en) * 1956-10-08 1959-04-21 Howard D Davenport Well drilling apparatus
US2901221A (en) * 1954-12-10 1959-08-25 Shell Dev Well drilling apparatus
US2937007A (en) * 1954-12-10 1960-05-17 Whittle Frank Well drilling system
DE1095230B (en) * 1958-01-07 1960-12-22 Helen R Hill Rotary drilling Hohlgestaenge
DE1100565B (en) * 1958-01-08 1961-03-02 Helen R Hill Rotary drilling Hohlgestaenge
US3012622A (en) * 1959-04-20 1961-12-12 Christensen Diamond Prod Co Core barrel apparatus
US3014542A (en) * 1959-12-01 1961-12-26 Jersey Production Res Corp Turbo-type earth drill
US3024855A (en) * 1959-07-06 1962-03-13 Jersey Prod Res Co Extensible drill bit
US3028921A (en) * 1955-01-14 1962-04-10 Lebus Royalty Company Method for drilling well bores
US3066749A (en) * 1959-08-10 1962-12-04 Jersey Prod Res Co Combination drill bit
US3088532A (en) * 1960-12-27 1963-05-07 Jersey Prod Res Co Bit loading device
US3105561A (en) * 1960-09-13 1963-10-01 Jersey Prod Res Co Hydraulic actuated drill collar
US3180437A (en) * 1961-05-22 1965-04-27 Jersey Prod Res Co Force applicator for drill bit
US3225844A (en) * 1961-05-05 1965-12-28 Exxon Production Research Co Bit weight applicator
US3834472A (en) * 1973-03-16 1974-09-10 L Perkins Jarring accelerator
US3870101A (en) * 1973-04-25 1975-03-11 Baker Oil Tools Inc Removable subsea production test valve assembly
US3901333A (en) * 1974-10-29 1975-08-26 Gulf Research Development Co Downhole bypass valve
US4212359A (en) * 1977-12-27 1980-07-15 Adcock Gerald L Downhole weight control device for impact rock drilling tool
US4526241A (en) * 1981-08-24 1985-07-02 Dailey Petroleum Services Corp. Adjustable length drilling sub
EP0681089A1 (en) * 1994-05-05 1995-11-08 Canadian Fracmaster Ltd Coiled tubing thruster
US5526887A (en) * 1992-12-16 1996-06-18 Rogalandsforskning Device for drilling holes in the crust of the earth, especially for drilling oil wells
WO1998016720A1 (en) * 1996-10-16 1998-04-23 Dailey International Inc. Constant bottom contact thruster
US6039118A (en) * 1997-05-01 2000-03-21 Weatherford/Lamb, Inc. Wellbore tool movement control and method of controlling a wellbore tool
US6070670A (en) * 1997-05-01 2000-06-06 Weatherford/Lamb, Inc. Movement control system for wellbore apparatus and method of controlling a wellbore tool
US6298930B1 (en) 1999-08-26 2001-10-09 Baker Hughes Incorporated Drill bits with controlled cutter loading and depth of cut
US6460631B2 (en) 1999-08-26 2002-10-08 Baker Hughes Incorporated Drill bits with reduced exposure of cutters
US6659199B2 (en) 2001-08-13 2003-12-09 Baker Hughes Incorporated Bearing elements for drill bits, drill bits so equipped, and method of drilling
US20060048973A1 (en) * 2004-09-09 2006-03-09 Brackin Van J Rotary drill bits including at least one substantially helically extending feature, methods of operation and design thereof
US20070151770A1 (en) * 2005-12-14 2007-07-05 Thomas Ganz Drill bits with bearing elements for reducing exposure of cutters
US20100263937A1 (en) * 2009-04-15 2010-10-21 Overstreet James L Methods of forming and repairing cutting element pockets in earth-boring tools with depth-of-cut control features, and tools and structures formed by such methods
US20100276200A1 (en) * 2009-04-30 2010-11-04 Baker Hughes Incorporated Bearing blocks for drill bits, drill bit assemblies including bearing blocks and related methods
US20110079438A1 (en) * 2009-10-05 2011-04-07 Baker Hughes Incorporated Drill bits and tools for subterranean drilling, methods of manufacturing such drill bits and tools and methods of directional and off center drilling
US20110100721A1 (en) * 2007-06-14 2011-05-05 Baker Hughes Incorporated Rotary drill bits including bearing blocks

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357564A (en) * 1919-11-17 1920-11-02 Howard R Hughes Method of regulating the load on rotary drills
US1660033A (en) * 1923-11-16 1928-02-21 Alfred P Braswell Weight regulator for rotary drills
US1686945A (en) * 1927-07-01 1928-10-09 James S Abercrombie Weight-regulating device
US1767350A (en) * 1928-09-12 1930-06-24 Erd V Crowell Rotary drill mechanism
US1844257A (en) * 1929-03-09 1932-02-09 Robert A Lincoln Slip joint for drill stems
US1900932A (en) * 1928-05-02 1933-03-14 Kennedye Corp Rotary well drilling bit control
US1905497A (en) * 1932-02-05 1933-04-25 Ingersoll Rand Co Working implement for percussive tools
US2300805A (en) * 1941-01-13 1942-11-03 Thomas W Pew Drilling bit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357564A (en) * 1919-11-17 1920-11-02 Howard R Hughes Method of regulating the load on rotary drills
US1660033A (en) * 1923-11-16 1928-02-21 Alfred P Braswell Weight regulator for rotary drills
US1686945A (en) * 1927-07-01 1928-10-09 James S Abercrombie Weight-regulating device
US1900932A (en) * 1928-05-02 1933-03-14 Kennedye Corp Rotary well drilling bit control
US1767350A (en) * 1928-09-12 1930-06-24 Erd V Crowell Rotary drill mechanism
US1844257A (en) * 1929-03-09 1932-02-09 Robert A Lincoln Slip joint for drill stems
US1905497A (en) * 1932-02-05 1933-04-25 Ingersoll Rand Co Working implement for percussive tools
US2300805A (en) * 1941-01-13 1942-11-03 Thomas W Pew Drilling bit

Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776817A (en) * 1952-07-21 1957-01-08 Shell Dev Drilling apparatus
US2901221A (en) * 1954-12-10 1959-08-25 Shell Dev Well drilling apparatus
US2937007A (en) * 1954-12-10 1960-05-17 Whittle Frank Well drilling system
US3028921A (en) * 1955-01-14 1962-04-10 Lebus Royalty Company Method for drilling well bores
US2819878A (en) * 1956-09-24 1958-01-14 J E Hill Suspension drilling device and jar
US2883156A (en) * 1956-10-08 1959-04-21 Howard D Davenport Well drilling apparatus
US2819879A (en) * 1957-01-09 1958-01-14 J E Hill Suspension drilling device and jar
DE1095230B (en) * 1958-01-07 1960-12-22 Helen R Hill Rotary drilling Hohlgestaenge
DE1100565B (en) * 1958-01-08 1961-03-02 Helen R Hill Rotary drilling Hohlgestaenge
US3012622A (en) * 1959-04-20 1961-12-12 Christensen Diamond Prod Co Core barrel apparatus
US3024855A (en) * 1959-07-06 1962-03-13 Jersey Prod Res Co Extensible drill bit
US3066749A (en) * 1959-08-10 1962-12-04 Jersey Prod Res Co Combination drill bit
US3014542A (en) * 1959-12-01 1961-12-26 Jersey Production Res Corp Turbo-type earth drill
US3105561A (en) * 1960-09-13 1963-10-01 Jersey Prod Res Co Hydraulic actuated drill collar
US3088532A (en) * 1960-12-27 1963-05-07 Jersey Prod Res Co Bit loading device
US3225844A (en) * 1961-05-05 1965-12-28 Exxon Production Research Co Bit weight applicator
US3180437A (en) * 1961-05-22 1965-04-27 Jersey Prod Res Co Force applicator for drill bit
US3834472A (en) * 1973-03-16 1974-09-10 L Perkins Jarring accelerator
US3870101A (en) * 1973-04-25 1975-03-11 Baker Oil Tools Inc Removable subsea production test valve assembly
US3901333A (en) * 1974-10-29 1975-08-26 Gulf Research Development Co Downhole bypass valve
US4212359A (en) * 1977-12-27 1980-07-15 Adcock Gerald L Downhole weight control device for impact rock drilling tool
US4526241A (en) * 1981-08-24 1985-07-02 Dailey Petroleum Services Corp. Adjustable length drilling sub
US5526887A (en) * 1992-12-16 1996-06-18 Rogalandsforskning Device for drilling holes in the crust of the earth, especially for drilling oil wells
EP0681089A1 (en) * 1994-05-05 1995-11-08 Canadian Fracmaster Ltd Coiled tubing thruster
WO1998016720A1 (en) * 1996-10-16 1998-04-23 Dailey International Inc. Constant bottom contact thruster
US5884716A (en) * 1996-10-16 1999-03-23 Dailey Petroleum Constant bottom contact thruster
US6039118A (en) * 1997-05-01 2000-03-21 Weatherford/Lamb, Inc. Wellbore tool movement control and method of controlling a wellbore tool
US6070670A (en) * 1997-05-01 2000-06-06 Weatherford/Lamb, Inc. Movement control system for wellbore apparatus and method of controlling a wellbore tool
US7814990B2 (en) 1999-08-26 2010-10-19 Baker Hughes Incorporated Drilling apparatus with reduced exposure of cutters and methods of drilling
US6298930B1 (en) 1999-08-26 2001-10-09 Baker Hughes Incorporated Drill bits with controlled cutter loading and depth of cut
US8172008B2 (en) 1999-08-26 2012-05-08 Baker Hughes Incorporated Drilling apparatus with reduced exposure of cutters and methods of drilling
US6779613B2 (en) 1999-08-26 2004-08-24 Baker Hughes Incorporated Drill bits with controlled exposure of cutters
US20040216926A1 (en) * 1999-08-26 2004-11-04 Dykstra Mark W. Drill bits with reduced exposure of cutters
US6935441B2 (en) 1999-08-26 2005-08-30 Baker Hughes Incorporated Drill bits with reduced exposure of cutters
US20050284660A1 (en) * 1999-08-26 2005-12-29 Dykstra Mark W Drill bits with reduced exposure of cutters
US8066084B2 (en) 1999-08-26 2011-11-29 Baker Hughes Incorporated Drilling apparatus with reduced exposure of cutters and methods of drilling
US7096978B2 (en) 1999-08-26 2006-08-29 Baker Hughes Incorporated Drill bits with reduced exposure of cutters
US20060278436A1 (en) * 1999-08-26 2006-12-14 Dykstra Mark W Drilling apparatus with reduced exposure of cutters
US20110114392A1 (en) * 1999-08-26 2011-05-19 Baker Hughes Incorporated Drilling apparatus with reduced exposure of cutters and methods of drilling
US6460631B2 (en) 1999-08-26 2002-10-08 Baker Hughes Incorporated Drill bits with reduced exposure of cutters
US6659199B2 (en) 2001-08-13 2003-12-09 Baker Hughes Incorporated Bearing elements for drill bits, drill bits so equipped, and method of drilling
US20060048973A1 (en) * 2004-09-09 2006-03-09 Brackin Van J Rotary drill bits including at least one substantially helically extending feature, methods of operation and design thereof
US7360608B2 (en) 2004-09-09 2008-04-22 Baker Hughes Incorporated Rotary drill bits including at least one substantially helically extending feature and methods of operation
US20080142271A1 (en) * 2004-09-09 2008-06-19 Baker Hughes Incorporated Methods of designing rotary drill bits including at least one substantially helically extending feature
US8011275B2 (en) 2004-09-09 2011-09-06 Baker Hughes Incorporated Methods of designing rotary drill bits including at least one substantially helically extending feature
US8752654B2 (en) 2005-12-14 2014-06-17 Baker Hughes Incorporated Drill bits with bearing elements for reducing exposure of cutters
US8448726B2 (en) 2005-12-14 2013-05-28 Baker Hughes Incorporated Drill bits with bearing elements for reducing exposure of cutters
US20070151770A1 (en) * 2005-12-14 2007-07-05 Thomas Ganz Drill bits with bearing elements for reducing exposure of cutters
US8141665B2 (en) 2005-12-14 2012-03-27 Baker Hughes Incorporated Drill bits with bearing elements for reducing exposure of cutters
US20110100721A1 (en) * 2007-06-14 2011-05-05 Baker Hughes Incorporated Rotary drill bits including bearing blocks
US8459382B2 (en) 2007-06-14 2013-06-11 Baker Hughes Incorporated Rotary drill bits including bearing blocks
US8757297B2 (en) 2007-06-14 2014-06-24 Baker Hughes Incorporated Rotary drill bits including bearing blocks
US9291002B2 (en) 2009-04-15 2016-03-22 Baker Hughes Incorporated Methods of repairing cutting element pockets in earth-boring tools with depth-of-cut control features
US20100263937A1 (en) * 2009-04-15 2010-10-21 Overstreet James L Methods of forming and repairing cutting element pockets in earth-boring tools with depth-of-cut control features, and tools and structures formed by such methods
US8943663B2 (en) 2009-04-15 2015-02-03 Baker Hughes Incorporated Methods of forming and repairing cutting element pockets in earth-boring tools with depth-of-cut control features, and tools and structures formed by such methods
US20100276200A1 (en) * 2009-04-30 2010-11-04 Baker Hughes Incorporated Bearing blocks for drill bits, drill bit assemblies including bearing blocks and related methods
US20110079438A1 (en) * 2009-10-05 2011-04-07 Baker Hughes Incorporated Drill bits and tools for subterranean drilling, methods of manufacturing such drill bits and tools and methods of directional and off center drilling
US9309723B2 (en) 2009-10-05 2016-04-12 Baker Hughes Incorporated Drill bits and tools for subterranean drilling, methods of manufacturing such drill bits and tools and methods of directional and off center drilling

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