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US3696875A - Diamond-studded drilling tool - Google Patents

Diamond-studded drilling tool Download PDF

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Publication number
US3696875A
US3696875A US877341A US3696875DA US3696875A US 3696875 A US3696875 A US 3696875A US 877341 A US877341 A US 877341A US 3696875D A US3696875D A US 3696875DA US 3696875 A US3696875 A US 3696875A
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United States
Prior art keywords
blades
tool
group
attack
protuberances
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US877341A
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English (en)
Inventor
Abel C Cortes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Total Compagnie Francaise des Petroles SA
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Compagnie Francaise des Petroles SA
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    • E—FIXED CONSTRUCTIONS
    • 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
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E—FIXED CONSTRUCTIONS
    • 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
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts

Definitions

  • ABSTRACT A high output drilling tool for earth of any nature
  • This invention relates to a drilling tool of the diamond-studded blade type with a very great efficiency, regardless of the nature of the ground it goes through, and with a structure that makes it possible to prevent both jamming and deterioration due to shock or rapid wear and tear.
  • this particular structure does not prevent impacts upon the parts of the blades that are situated outside the lateral regions of the tools. Furthermore, it was necessary in order to obtain a correct flow of the sludge and, consequently, to preserve the correct advance speed to provide nozzles in the pieces arranged between the blades; these nozzles come out in the vicinity of the lateral regions of the tools.
  • the purpose of this invention is to provide a very high-yield drilling tool for terrain of any kind, featuring openings for the injection of sludge, characterized by the fact that this tool involves protuberances distributed over its end surface, each protuberance having an average height measured parallel to the axis of the tool several times greater than its average thickness and at the same time involving an attack edge and at least one peripheral surface for the attack of the ground, each protuberance being bordered, at least partially, by a hollow region whose depth is at least equal to the average height of the protuberance, these hollow regions, which succeed each other, thus allow passage for the earth that has been torn away.
  • Another object of the invention is to increase the output of such a tool by using, as protuberances, blades exclusively involving, in the regions of attack, a concretion of diamonds, sunk into a mass consisting of at least one of the carbides of the following metals: tungsten, titanium, tantalum, chromium, vanadium, niobium, molybdenum, or another metal that resists abrasion and at least one of the following metals: cobalt, nickel, molybdenum, or any other metal generally used in the current state of the art of powder metallurgy, the blades being distributed over the entire surface of the tool in concentric and adjacent groups, that is to say, by groups where the distances between theextreme edges of each blade of one group with respect to the axis of the tool are included within a predetermined minimum distance and a maximum distance, the minimum distance of the edges of the blades of one group being essentially identical to the maximum distance of the edges of the blades of the group which is adjacent to it
  • Another object of the invention is to improve the output of drilling tools of the type mentioned above in hard ground by means of diamond-studded blades having a ground attack surface which works by means of scraping, which is perpendicular to the axis of the tool, the blades being arranged by groups consisting of blades whose abovementioned attack surfaces are one and the same plane, one of the edges of these surfaces constituting the attack edge of the said blades, this edge being inclined with respect to the radius situated in said plane and joining the axis of the tool at one end of the attack edge, each blade having furthermore the same vertical angle of clearance.
  • Another object of the invention is the improvement of the output of drilling tools of the type described above in sticky ground by distributing the groups of blades in a concentric manner and by arranging the blades in such a way that the lower surfaces of the blade of one group are on the same level, with the corresponding levels of the various groups of blades first decreasing, with the tool presumably in the working position, and then increasing while passing from the central group to the peripheral concentric group, the blades belonging to two adjacent groups being staggered in such a way that the blades are arranged essen-.
  • Another object of the invention is a long-lasting drilling tool capable of withstanding shocks, a tool whose blades have at their base and on the side opposite their attack face counterforts or bracing ribs, said blades being attained by means of sintering on the basis of a compound made up of at least one of the carbides of the following metals: tungsten, titanium, tantalum, chromium, vanadium, niobium, molybdenum, or any other metal that resists abrasion, and at least one of the following metals: cobalt, nickel, molybdenum, or any other metal generally used in the current state of the art of sintering, particles of diamonds being incorporated in their lower portion and in their lateral radial portion over a thickness of 2-20 mm, the two being assumed to be in the drilling position.
  • the body of the tool is made up of a compound containing at least one of the following materials: cobalt, nickel, molybdenum, carbide of tungsten WC, carbide of tungsten W C, carbide of chromium, of titanium, of tantalum, of vanadium, of niobium, said compounds incorporating, by infiltration, a brazing mixture containing at least two of the following elements: copper, nickel, iron, zinc, tin, silver, silicon boron, manganese, aluminum and lead, said brazing mixture representing 25-60 percent of the weight of said infiltrated compound.
  • Such a compound offers the advantage of giving great tenacity to the blades which thus resist shocks without breaking away from the body of the tool; besides, they permit a reduction in the thickness of the blades. From this we get a higher pressure of their surface which is in contact with the ground; this facilitates the breakaway of the ground or earth after the passage of each blade.
  • FIG. 1 represents a schematic plan view of the tool
  • FIG. 2 is a cross-section view of the tool along the section II-II of FIG. 1, on which we have shown, on the same scale, the apparent outline of the groups of blades given by staggered axial-cross-sections, as well as the dimensions of the blades belonging to each group;
  • FIG. 3 is a cross-section view of a blade of the peripheral group
  • FIG. 4 is a cross-section of anyblade along a plane essentially parallel to the lateral faces of the blade
  • FIGS. 5-9 are axial half-cross-sections made, respectively, along planes OA, OB, OC, OD, and OE in FIG.
  • FIG. 10 is a perspective view of the tool.
  • FIG. 1 shows the distribution in terms of concentric groups on the body of the tool of the assembly of protuberances which we have represented in the example chosen in the form of blades.
  • the blades, such as blade 7 of group 4 for example, have a cross-section perpendicular to the axis of the tool which is essentially rectangular.
  • the dotted lines 8 indicate the apparent outline of the base of blade 7, sunk in body 9 of the tool shown in FIG. 2, along cross-section IIII in FIG. I.
  • FIG. 2 The outline of cross-section ll-II of the tool is shown at 10, in FIG. 2.
  • the height of the single blade 19 in group 1 FIG. 1, situated between the nozzles 11 and 20, corresponds to the height of line 21 in FIG. 2.
  • the blades whose attack surfaces, perpendicular to the axis of the tool, are at the highest height or level correspond to the blades of group 3, such as, for example, blade 22.
  • the height of their attack surface is indicated at 23, FIG. 2.
  • the blades have a length that is greater than that of the other blades.
  • All of the blades are obtained by sintering from a compound consisting of at least one of the carbides of the following metals: tungsten, titanium, tantalum, chromium, vanadium, niobium, molybdenum, or any other metal that resists abrasion, and at least one of the following metals: cobalt, nickel, molybdenum, or any other metal generally used in the current state of the art of sintering.
  • the blades are attached by means of metallurgical setting at the moment of the formation of the tool whose body is obtained from a compound containing at least one of the following materials: cobalt, nickel, molybdenum, carbide of tungsten WC, carbide of tungsten W C, carbide of chromium, of titanium, of tantalum, of vanadium, of niobium, in which we incorporate a brazing mixture.
  • a brazing mixture we arrange the blades in a mold, containing the above compound, and we bring the entire substance to a temperature that brings about the fusion of the brazing mixture. We thus get a tool whose infiltrated body brings about perfect implanation of the blades.
  • brazing mixture incorporated here may represent -60 percent of the weight of the compound of carbides and of metals, incorporated here, such as molybdenum, nickel, and cobalt.
  • brazing mixtures we might mention, for example, the following compounds:
  • Copper 30 to 50 Nickel 5 to 25 Iron 1 to 2 2. Copper 25 to Tin 8 to 30 Nickel 3 to 60 as well as the binary compounds of copper, silver, or copper-tin, or tin-lead, as well as the composition copper-siliconboronmanganese.
  • the blades could contain carbide of molybdenum and the metals used in the sinter compound with the carbide or carbides could include one of the following associations: cobaltmolybdenum-copper; iron-nickel-chromium; nickel-copper; nickel-chromium; nickelmolybdenum; cobaltmolybdenum or cobaltchromium.
  • Zone 59 consisting of tungsten carbide alloyed with cobalt, for example, involves a diamond-studded concretion in working zone 55, thus conferring the required abrasion-resistance qualities to the attack surfaces which are perpendicular to the axis of the tool, such as 56, and to the lateral radial surfaces, such as 57.
  • Zone 58 that is to say, the body of the tool, consists of for example tungsten carbide infiltrated by a brazing mixture having one of the abovementioned compositions.
  • the angle of clearance 32 with respect to the direction of rotation 33 of the tool makes it possible to move along portions of earth which have been torn away and to remove them via the sludge circulating in the free spaces between two adjacent lines of blades, arranged essentially in the form of steps and in spirals, such as line of blades 34, 35, 36, and 22, on the one hand, and line 37, 38, 39, and 40, on the other hand.
  • FIGS. 5-9 the half-cross-sections along sections 0A, OB, 0C, 0D, and OE, in FIG. 1.
  • FIG. 5 we see, at 19, 15, 41, and 34, the edges of the blades bearing the same reference number shown in FIG. 1.
  • the outline of the cross-section between the blades 41 and 34 shows the level drop of the surface of the body of the tool along the edge of line 34, 35, 36, and 22..
  • FIG. 8 shows, on the one hand, the profile of the cross-section made along section OD, in FIG. 1, on the level of opening 20, and on the other hand the vertical prolongation 45 of the surface of the body of the tool bordering on line 57, 38, 39, and 40, beyond blade 39. This vertical prolongation corresponds to the surface of the tool. between the lateral blades 37 and 46.
  • FIGS. 7 and 9 show the abrupt variations in the. slope of the surface of the body of the tool for a very small variation in the direction of the plane of the cross-section in the positions corresponding to two homologous sectors.
  • the gentle slope of part 47 is due to the fact that section OE is tangent to the attack edge of blade 40.
  • portion 48, bordering on blade 49, is vertical as in the case in FIG. 8."
  • FIG. 10 which illustrates the tool in perspective
  • counterforts such as 52 could start from only one portion of the blade situated well below the chamfer and connect the prolongation of the attack edge of the adjacent blade of the immediately higher group, the tool being in drilling position.
  • the base of the body of the tool may have any appropriate form with a view to its attachment to the end of the set of rods or it may on the contrary be adapted with a view to its connection to an intermediate tool. This is why the lower portion of the cross-section in FIG. 2 has not been shown in detail.
  • the number of blades or protuberances, per unit of surface may vary and the thickness, the length, and the height vary as a function of the number of blades or protuberances per unit of surface.
  • a high output drilling tool for ground of any nature and having openings through the end portion thereof for the injection of sludge said drilling tool comprising, a plurality of independent protuberances individually distributed over its end surface, each independent protuberance having a separate counterfort for support thereof, each protuberance having an average height measured parallel to the axis of the tool which is at least twice its average thickness and having an attack edge and at least one peripheral surface for attacking ground, a depression formed in said drilling tool adjacent each protuberance on the attack edge side thereof whose depth is at least equal to the average height of the protuberance, said depressions lying adjacent each other and having sufficient width to provide continuous flow paths for the ground that has been torn away.
  • protuberances include blades bearing exclusively in the attack regions a concretion of diamonds sunk in a sintered mass comprising at least one of the carbides of tungsten, titanium, tantalum, chromium, fanadium, niobium, molybdenum, and at least one of the following metals; cobalt, nickel, molybdenum, the blades being distributed over the end surface of the tool in concentric and adjacent groups, that is to say, by groups where the distances of the extreme edges of each blade of a group with respect to the axis of the tool are included within a predetermined minimum radial distance and a maximum radial distance, the minimum distance of the edges of the blades of one group being essentially identical to the maximum distance of the edges of the blade of the group which is internally adjacent to it, the blades of at least one group being staggered laterally with respect to the blades of the adjacent groups.
  • protuberances include diamond-studded blades, having a surface for attacking the ground by means of scraping, said surface being perpendicular to the axis of the tool, the blades being distributed by groups consisting of blades whose attacksurfaces are inthe same plane, one of the edges'of the attack surfaces constituting the attack edge of said blade, said edge being inclined with respect to the radius situated in said plane and joining the axis of the tool at one end of the attack edges, each blade having furthermore the same vertical angle of clearance.
  • protuberances are blades obtained by sintering from a compound made up of at least one carbide of tungsten or of titanium, tantalum, chromium, vanadium, niobium, molybdenum, and at least one of the following metals: cobalt, nickel, molybdenum, particles of diamonds being incorporated in their lower portion and in their lateral radial portion over a thickness of 2-20 mm, the tool being assumed to be in drilling position.
  • brazing mixture representing 25-60 percent of the weight of said infiltrated compound.
  • a drilling tool in accordance with claim 1, above whose protuberances are blades revealing a ground attack surface perpendicular to the axis of the tool and an attack surface parallel to said axis, the blades being distributed in the form of concentric groups, each blade of a group extending in the direction of its length, in a direction inclined with respect to the direction of its horizontal displacement, and each of the two extreme edges of each of the blades of the group being, respectively, at the same predetermined distance from the axis of the tool.
  • a drilling tool in accordance with claim 1 having a protuberance one of whose edges coincides with the axis of the tool.
  • a drilling tool with blades for terrain of any nature characterized by the fact that the blades involve, exclusively in the attack regions, a concretion of diamonds sunk in a mass consisting of at least one of the carbides of the following metals: tungsten, titanium, tantalum, molybdenum, chromium, vanadium, niobium, and at least one of the following metals: cobalt, nickel, molybdenum, the blades being attached to the body of the tool by metallurgical setting, the body of the tool being made up of a compound containing at least one of the following materials: cobalt, nickel, molybdenum, tungsten carbide WC, tungsten carbide W C, carbide of chromium, of titanium, of tantalum, of molybdenum, of vanadium, of niobium, said compound incorporating, by infiltration, a brazing mixture containing at least two of the following elements: copper, nickle, iron, zinc, tin,
  • a drilling tool comprising a main body and protuberances extending at least from the end face of said body, at least one of said protuberances having a drilling face disposed in a direction substantially perpendicular to the direction of its extension from said main body, the improvement comprising said protuberances being formed of a material comprising a concretion of diamonds sunk in a mass consisting of at least one of the carbides of an abrasion-resistant metal selected from the group consisting of tungsten, titanium, tantalum, molybdenum, chromium, vanadium and niobium, and at least one metal selected from the group consisting of cobalt, nickel and molybdenum, wherein said protuberances are attached to said main body by a metallurgical setting, wherein said main body comprises a material containing at least one member selected from the group consisting of cobalt, nickel, molybdenum, tungsten carbide, and a carbide of a member selected from the group consisting
  • said slntered mass comprising at east one of the carbides of tungsten, titanium, tantalum, chromium, vanadium, niobium, molybdenum, and at least one of the following metals: cobalt, nickel, molybdenum, each protuberance having an attack edge and at least one peripheral surface for attacking ground, a depression formed in said drilling tool adjacent each protuberance on the attack edge side thereof, said depressions lying adjacent each other and having sufficient width to provide continuous flow paths for the ground that has been torn away, and a counterfort at the base of each blade and opposite its attack edge, the base of said counterforts extending in the direction opposite the at tack edges of said protuberances at least to the level of a rearward portion of the radially inward edge of the attack surface of the nearest radially outward protuberance, the level of the nearest

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
US877341A 1969-03-19 1969-11-17 Diamond-studded drilling tool Expired - Lifetime US3696875A (en)

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FR6907864A FR2029963A5 (it) 1969-03-19 1969-03-19

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BE (1) BE740959A (it)
BR (1) BR7017010D0 (it)
CH (1) CH528008A (it)
CS (1) CS193458B2 (it)
DE (1) DE1954576C3 (it)
ES (1) ES375650A1 (it)
FR (1) FR2029963A5 (it)
GB (1) GB1310883A (it)
NL (1) NL152053B (it)
PL (1) PL74590B1 (it)
RO (1) RO58895A (it)
SU (1) SU547179A3 (it)
YU (1) YU33125B (it)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768581A (en) * 1971-05-04 1973-10-30 Petroles Cie Francaise Frustro-conical drilling bit having radially tiered groups of teeth
US3938599A (en) * 1974-03-27 1976-02-17 Hycalog, Inc. Rotary drill bit
US4234048A (en) * 1978-06-12 1980-11-18 Christensen, Inc. Drill bits embodying impregnated segments
US4241798A (en) * 1979-01-29 1980-12-30 Reed Tool Company Drilling bits for plastic formations
US4244432A (en) * 1978-06-08 1981-01-13 Christensen, Inc. Earth-boring drill bits
US4351401A (en) * 1978-06-08 1982-09-28 Christensen, Inc. Earth-boring drill bits
US4550790A (en) * 1983-02-28 1985-11-05 Norton Christensen, Inc. Diamond rotating bit
US4789251A (en) * 1986-05-19 1988-12-06 Smith International, Inc. Cooling networks for PCD bearing surfaces
US5175988A (en) * 1988-06-23 1993-01-05 Kanai Juyo Kogyo Company Ltd. Ring for spinning machinery
US5963775A (en) * 1995-12-05 1999-10-05 Smith International, Inc. Pressure molded powder metal milled tooth rock bit cone
US6394202B2 (en) 1999-06-30 2002-05-28 Smith International, Inc. Drill bit having diamond impregnated inserts primary cutting structure
US20100155151A1 (en) * 2008-12-19 2010-06-24 Varel International Multi-set pdc drill bit and method
US20100252332A1 (en) * 2009-04-02 2010-10-07 Jones Mark L Drill bit for earth boring
GB2480384A (en) * 2010-05-14 2011-11-16 Element Six A PCD body
US9194189B2 (en) 2011-09-19 2015-11-24 Baker Hughes Incorporated Methods of forming a cutting element for an earth-boring tool, a related cutting element, and an earth-boring tool including such a cutting element
US9200484B2 (en) 2012-01-20 2015-12-01 Baker Hughes Incorporated Superabrasive-impregnated earth-boring tools with extended features and aggressive compositions, and related methods
US9731358B2 (en) 2013-06-06 2017-08-15 Milwaukee Electric Tool Corporation Step drill bit
US11273501B2 (en) 2018-04-26 2022-03-15 Milwaukee Electric Tool Corporation Step drill bit

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2105219C3 (de) * 1971-02-04 1981-06-11 Shell Internationale Research Maatschappij B.V., 's-Gravenhage Diamantbohrmeißel
SU483863A1 (ru) * 1973-01-03 1980-06-15 Всесоюзный Научно-Исследоваельский И Проектный Институт Тугоплавких Металлов И Твердых Сплавов Способ изготовлени алмазного бурового инструмента
JPS5410325B2 (it) * 1974-06-10 1979-05-04
DE2633779C3 (de) * 1976-07-28 1983-11-03 Richard 5383 Kierspe Karnebogen Schlagbohrkrone
US4073354A (en) * 1976-11-26 1978-02-14 Christensen, Inc. Earth-boring drill bits
GB1548499A (en) * 1977-05-17 1979-07-18 Shell Int Research Rotary drilling bit for deephole drilling and method of manufacturing the same
GB1537000A (en) * 1977-08-17 1978-12-29 Shell Int Research Rotary drilling bit
FR2433130A1 (fr) * 1978-08-11 1980-03-07 Petroles Cie Francaise Dispositif antifriction, notamment pour turbine, et procede de realisation
DE2916347C3 (de) * 1979-04-23 1981-12-03 Christensen, Inc., 84114 Salt Lake City, Utah Lagerstuhl für Direktantriebe von Tiefbohrmeißeln o.dgl. in einem Bohrloch arbeitenden Werkzeugen oder Geräten
DE9308443U1 (de) * 1993-06-05 1993-08-19 Bilfinger + Berger Bauaktiengesellschaft, 68165 Mannheim Vollbohrkrone zum Herstellen von verrohrten Erdbohrungen

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US2381415A (en) * 1943-11-19 1945-08-07 Jr Edward B Williams Drill bit
US2607562A (en) * 1951-03-19 1952-08-19 Phipps Orville Self-piloted rotary drill bit
US2800302A (en) * 1952-01-23 1957-07-23 Austin Powder Co Auger head
US3059708A (en) * 1959-08-07 1962-10-23 Jersey Prod Res Co Abrasion resistant stepped blade rotary drill bit
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US3106973A (en) * 1960-09-26 1963-10-15 Christensen Diamond Prod Co Rotary drill bits
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CA659574A (en) * 1963-03-19 H. Davis Sidney Drilling bit
US2381415A (en) * 1943-11-19 1945-08-07 Jr Edward B Williams Drill bit
US2607562A (en) * 1951-03-19 1952-08-19 Phipps Orville Self-piloted rotary drill bit
US2800302A (en) * 1952-01-23 1957-07-23 Austin Powder Co Auger head
US3059708A (en) * 1959-08-07 1962-10-23 Jersey Prod Res Co Abrasion resistant stepped blade rotary drill bit
US3106973A (en) * 1960-09-26 1963-10-15 Christensen Diamond Prod Co Rotary drill bits
US3158216A (en) * 1961-04-27 1964-11-24 Inst Francais Du Petrole High speed drill bit
US3180440A (en) * 1962-12-31 1965-04-27 Jersey Prod Res Co Drag bit
GB996796A (en) * 1963-03-09 1965-06-30 P & V Mining & Engineering Ltd Improvements in and relating to tools for operating in rock, coal and other material
US3280927A (en) * 1964-01-31 1966-10-25 Petersen Anita E Finger-type pilot bit

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768581A (en) * 1971-05-04 1973-10-30 Petroles Cie Francaise Frustro-conical drilling bit having radially tiered groups of teeth
US3938599A (en) * 1974-03-27 1976-02-17 Hycalog, Inc. Rotary drill bit
US4244432A (en) * 1978-06-08 1981-01-13 Christensen, Inc. Earth-boring drill bits
US4351401A (en) * 1978-06-08 1982-09-28 Christensen, Inc. Earth-boring drill bits
US4234048A (en) * 1978-06-12 1980-11-18 Christensen, Inc. Drill bits embodying impregnated segments
US4241798A (en) * 1979-01-29 1980-12-30 Reed Tool Company Drilling bits for plastic formations
US4550790A (en) * 1983-02-28 1985-11-05 Norton Christensen, Inc. Diamond rotating bit
US4789251A (en) * 1986-05-19 1988-12-06 Smith International, Inc. Cooling networks for PCD bearing surfaces
US5175988A (en) * 1988-06-23 1993-01-05 Kanai Juyo Kogyo Company Ltd. Ring for spinning machinery
US5963775A (en) * 1995-12-05 1999-10-05 Smith International, Inc. Pressure molded powder metal milled tooth rock bit cone
US6394202B2 (en) 1999-06-30 2002-05-28 Smith International, Inc. Drill bit having diamond impregnated inserts primary cutting structure
US6725953B2 (en) 1999-06-30 2004-04-27 Smith International, Inc. Drill bit having diamond impregnated inserts primary cutting structure
US20100155151A1 (en) * 2008-12-19 2010-06-24 Varel International Multi-set pdc drill bit and method
US8327956B2 (en) 2008-12-19 2012-12-11 Varel International, Ind., L.P. Multi-set PDC drill bit and method
US20100252332A1 (en) * 2009-04-02 2010-10-07 Jones Mark L Drill bit for earth boring
US8439136B2 (en) * 2009-04-02 2013-05-14 Atlas Copco Secoroc Llc Drill bit for earth boring
GB2480384A (en) * 2010-05-14 2011-11-16 Element Six A PCD body
WO2011141898A1 (en) * 2010-05-14 2011-11-17 Element Six (Production) (Pty) Ltd Polycrystalline diamond
US9194189B2 (en) 2011-09-19 2015-11-24 Baker Hughes Incorporated Methods of forming a cutting element for an earth-boring tool, a related cutting element, and an earth-boring tool including such a cutting element
US9771497B2 (en) 2011-09-19 2017-09-26 Baker Hughes, A Ge Company, Llc Methods of forming earth-boring tools
US9200484B2 (en) 2012-01-20 2015-12-01 Baker Hughes Incorporated Superabrasive-impregnated earth-boring tools with extended features and aggressive compositions, and related methods
US10472898B2 (en) 2012-01-20 2019-11-12 Baker Hughes, A Ge Company, Llc Earth-boring tools with extended cutting features and related methods
US9731358B2 (en) 2013-06-06 2017-08-15 Milwaukee Electric Tool Corporation Step drill bit
US10252351B2 (en) 2013-06-06 2019-04-09 Milwaukee Electric Tool Corporation Step drill bit
US10695845B2 (en) 2013-06-06 2020-06-30 Milwaukee Electric Tool Corporation Step drill bit
USD936117S1 (en) 2013-06-06 2021-11-16 Milwaukee Electric Tool Corporation Step drill bit
US11273501B2 (en) 2018-04-26 2022-03-15 Milwaukee Electric Tool Corporation Step drill bit
US11691203B2 (en) 2018-04-26 2023-07-04 Milwaukee Electric Tool Corporation Step drill bit

Also Published As

Publication number Publication date
RO58895A (it) 1976-01-15
BR7017010D0 (pt) 1973-04-10
ES375650A1 (es) 1972-05-16
DE1954576C3 (de) 1973-10-31
DE1954576A1 (de) 1970-10-01
CS193458B2 (en) 1979-10-31
SU547179A3 (ru) 1977-02-15
PL74590B1 (en) 1974-12-31
YU33125B (en) 1976-04-30
FR2029963A5 (it) 1970-10-23
NL152053B (nl) 1977-01-17
GB1310883A (en) 1973-03-21
DE1954576B2 (de) 1973-04-12
NL6919217A (it) 1970-09-22
YU3470A (en) 1975-10-31
BE740959A (it) 1970-04-01
CH528008A (fr) 1972-09-15

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