EP0246789A2 - Schneidelement für einen Drehbohrmeissel, Drehbohrmeissel mit derartigem Schneidelement und dessen Herstellungsverfahren - Google Patents

Schneidelement für einen Drehbohrmeissel, Drehbohrmeissel mit derartigem Schneidelement und dessen Herstellungsverfahren Download PDF

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Publication number
EP0246789A2
EP0246789A2 EP87304144A EP87304144A EP0246789A2 EP 0246789 A2 EP0246789 A2 EP 0246789A2 EP 87304144 A EP87304144 A EP 87304144A EP 87304144 A EP87304144 A EP 87304144A EP 0246789 A2 EP0246789 A2 EP 0246789A2
Authority
EP
European Patent Office
Prior art keywords
slug
polycrystalline diamond
cutter
elements
tungsten carbide
Prior art date
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.)
Withdrawn
Application number
EP87304144A
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English (en)
French (fr)
Other versions
EP0246789A3 (de
Inventor
Michael Thomas Wardley
Malcolm Roy Taylor
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.)
NL Petroleum Products Ltd
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NL Petroleum Products Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NL Petroleum Products Ltd filed Critical NL Petroleum Products Ltd
Publication of EP0246789A2 publication Critical patent/EP0246789A2/de
Publication of EP0246789A3 publication Critical patent/EP0246789A3/de
Withdrawn legal-status Critical Current

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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
    • E21B10/56—Button-type inserts
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/5676—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a cutting face with different segments, e.g. mosaic-type inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools

Definitions

  • the invention relates to rotary drill bits for use in drilling or coring deep holes in subsurface formations, and in particular relates to cutters for use in such drill bits.
  • Rotary drill bits of the kind to which the present invention is applicable comprise a bit body having a shank for connection to a drill string and an inner passage for supplying drilling fluid to the face of the bit.
  • the bit body carries a plurality of so called “preform" cutters. Each cutter may be mounted directly on the bit body or on a carrier, such as a stud or post, which is received in a socket in the bit body.
  • One common form of preform cutter is a polycrystalline diamond compact comprising a hard facing layer of polycrystalline diamond and a backing layer formed of cemented tungsten carbide. Since the backing layer is of less hard material than the facing layer, the two layer arrangement of the cutting element provides a degree of self-sharpening since, in use, the less hard backing layer wears away more easily than the harder cutting layer.
  • the bit body is machined from solid metal, usually steel, or is moulded using a powder metallurgy process in which tungsten carbide powder is infiltrated with metal alloy binder in a furnace so as to form a hard matrix.
  • the maximum furnace temperature required to form the matrix may be of the order of 1050° to 1170°C.
  • Conventional two layer preform cutters of the kind referred to above are not thermally stable at such temperatures and for this reason they normally require to be mounted on the bit body after it has been formed, and this may be a time consuming and costly process.
  • thermally stable cutter elements which are thermally stable at the infiltration temperature of matrix bodied bits.
  • thermally stable cutter elements have been manufactured and sold by the General Electric Company under the trademark "GEOSET” and by DeBeers under the trademark "SYNDAX 3".
  • the diamond layer comprises polycrystalline diamond particles bonded together by a high temperature, high pressure process using a cobalt catalyst, with the result that, in the finished cutter, cobalt is present in the interstices between the diamond particles. It is the presence of cobalt, and perhaps other metallic interstitial components, which causes the cutters to be non-thermally stable due, for example, to the significant difference in coefficient of thermal expansion between the cobalt and the diamond.
  • thermal stability is achieved by forming the element wholly from polycrystalline diamond, using cobalt but without the tungsten carbide backing layer, and then leaching out the cobalt and any other metallic interstitial components after the cutting element has been formed.
  • SYNDAX 3 elements thermal stability is achieved by using silicon instead of cobalt in the formation of the elements so that the interstices between the diamond particles in the finished element contain silicon and/or silicon carbide.
  • the presence of silicon/silicon carbide in the interstices unlike tne presence of cobalt, does not cause thermal instability of the diamond, so that it is not necessary to leach out the interstitial material. Since no leaching out of metallic interstitial components is required, "SYNDAX 3" elements may be manufactured to the same sizes and shapes as non-­thermally stable elements.
  • matrix material is normally understood to mean a material formed by a powder metallurgy process in which metallic powder, usually tungsten carbide, is infiltrated with a metal alloy binder in a furnace so as to form a hard matrix when cooled).
  • the "GEOSET” elements are thermally stable at the furnace temperatures (1050 to 1170°C) required to form infiltrated tungsten carbide matrix.
  • matrix material is fairly hard and erosion resistant it is less hard and less erosion resistant than the cemented tungsten carbide normally used as the backing layer in two-layer non-­thermally stable cutters. Consequently, the composite cutters described in the above mentioned specifications may be insufficiently erosion resistant and may wear rapidly in use. As the surrounding matrix wears away the diamond elements become freed from the matrix and become lost rendering the cutter ineffective.
  • the rest of the composite cutter is sufficiently hard and erosion resistant to minimise damage to the cutter and loss of the polycrystalline diamond elements in use.
  • the cemented tungsten carbide in which the elements are embedded may be so arranged in relation to the elements that the composite cutter has a similar self-sharpening characteristic as described above in relation to two-layer non-thermally stable cutters.
  • a cutter for use in a rotary drill bit, comprising a number of thermally stable polycrystalline diamond elements at least partly embedded in a slug of cemented tungsten carbide, the cemented tungsten carbide having been formed by hot pressing with cobalt.
  • the thermally stable polycrystalline diamond may be of the kind in which the interstices between the diamond particles are substantially filled with silicon material.
  • silicon material should be understood to include silicon and silicon carbide since, as mentioned above, both substances are likely to be present in the interstices of a "SYNDAX 3"-type element. Also, the presence in the interstices of traces of other substances is not excluded.
  • the thermally stable polycrystalline diamond may be of the kind in which metallic interstitial components have been leached out, and each element has been coated with a protective material, such as nickel.
  • Each cemented tungsten carbide slug may have a front surface, a rear surface and a peripheral surface and in this case at least one polycrystalline diamond element is preferably so located in the slug as to have surfaces thereof disposed at the front surface and at the peripheral surface respectively of the slug.
  • the polycrystalline diamond element may extend, in the direction of the depth of the slug, only part of the way from the front surface towards the rear surface of the slug so that the portion of the slug between the polycrystalline diamond element and the rear surface of the slug acts as a backing layer to the polycrystalline diamond element so as to provide a degree of self-sharpening of the cutter in the vicinity of the polycrystalline diamond element in use of the cutter.
  • Each polycrystalline diamond element may be of substantially constant cross-section between two opposite end faces thereof, one of said end faces lying in, and substantially co-planar with, the front surface of the slug.
  • each polycrystalline diamond element has a peripheral surface and preferably a portion of the peripheral surface of each element lies substantially in the peripheral surface of the slug.
  • the slug of cemented tungsten carbide may be of any convenient shape and dimensions.
  • it may be in the form of a tablet or block of substantially uniform thickness and cross-section as it extends from the front surface to the rear surface thereof.
  • the slug may be circular in shape or may be in the form of a semi-circle or a segment or sector of a circle.
  • the slug may be generally rectangular: for example it may be square.
  • any of the forms of cutter referred to above there may be provided an array of polycrystalline diamond elements extending around only a part of the periphery of the slug.
  • a cutter having this feature will be so orientated on the drill bit that the part of the periphery of the slug carrying the array of polycrystalline diamond elements forms the cutting edge of the cutter and engages the formation being cut.
  • the array may comprise, for example, essentially a single row of polycrystalline diamond elements or a single row of such elements with further polycrystalline diamond elements disposed inwardly of the row with respect to the periphery of the slug.
  • the polycrystalline diamond elements in the row, or each row, of elements may be disposed closely adjacent one another so as to extend substantially continuously around said part of the periphery of the slug.
  • One or more further rows of polycrystalline diamond elements may also be disposed in the peripheral surface of the slug intermediate the front surface and rear surface thereof.
  • the invention includes within its scope a cutting structure, for mounting on a rotary drill bit, comprising a cutter of any of the kinds referred to above mounted on a carrier.
  • the carrier may, for example, comprise a stud or post to be received in a socket in the bit body.
  • the cutter may be brazed, bonded or otherwise attached to the carrier.
  • the invention also includes a rotary drill bit of the kind first referred to including a plurality of cutting structures of the last mentioned kind mounted on the bit body, or a drill bit of the kind first referred to wherein cutters of any of the kinds referred to above are directly mounted, by brazing or otherwise, on the bit body.
  • the invention also provides a method of manufacturing a cutter for use in a rotary drill bit comprising forming by hot pressing with cobalt a slug of cemented tungsten carbide, and incorporating in the slug, during the hot pressing process, a number of thermally stable polycrystalline diamond elements.
  • the bit body 10 is typically formed of tungsten carbide matrix infiltrated with a binder alloy, and has a threaded shank 11 at one end for connection to the drill string.
  • the operative end face 12 of the bit body is formed with a number of blades 13 radiating from the central area of the bit and the blades carry cutting structures 14 spaced apart along the length thereof.
  • the bit gauge section 15 includes kickers 16 which contact the walls of the borehole to stabilise the bit in the borehole.
  • a central passage (not shown) in the bit body and shank delivers drilling fluid through nozzles 17 in the end face 12 in known manner, to cool and clean the cutting structures.
  • Each cutting structure 14 comprises a cutting element 18 mounted on a carrier 19 in the form of a stud which is located in a socket in the bit body 10.
  • Each cutter 18 is in the form of a circular tablet, the rear surface of the cutter being bonded, for example by brazing, to a suitably orientated surface on the stud 19.
  • cutting structure shown is by way of example only and any suitable shape of cutter may be employed, mounted on any suitable form of carrier.
  • the cutters are mounted directly on the bit body and such arrangements are also within the scope of the invention.
  • FIG 3 shows a typical cutter in accordance with the invention which may be directly used as one of the cutters 18 in a drill bit of the kind shown in Figures 1 and 2.
  • the cutter comprises a slug 20 in the form of a generally circular tablet of cemented tungsten carbide.
  • a slug 20 in the form of a generally circular tablet of cemented tungsten carbide.
  • Embedded in the cemented tungsten carbide are a plurality of generally rectangular tablets 21 of thermally stable polycrystalline diamond material. Seven such elements are spaced apart in a row around one half of the periphery of the slug 20 so that one side of each element 21 lies at the periphery of the slug so as to form part of the peripheral surface of the cutter. Inwardly of the outer row of elements are located two further elements adjacent the mid point of the first row of elements.
  • the cutter is so orientated on the drill bit that the first part of the cutter to engage the formation being drilled is in the vicinity of the central element in the outer row of elements.
  • the elements 21 may extend through the full thickness of the slug 20 or may extend from the front face of the slug only part of the way through the thickness and towards the rear face.
  • the thickness of the slug between the elements and the rear face of the slug then provides, in effect, a less hard backing layer for the elements so as to provide a degree of self-­sharpening in similar fashion to a conventional non-­thermally stable two layer cutter.
  • the tungsten carbide slug 22 is in the form of a sector of a circle and generally square polycrystalline diamond elements 23 are embedded in the tungsten carbide so as to extend along the two straight sides of the slug leading to the apex. Further elements 24 are disposed inwardly of the apex.
  • the cutter is mounted on the drill bit so that the polycrystalline diamond element at the apex of the slug first engages the formation.
  • Figure 5 also shows a sector shaped slug 25 of tungsten carbide and in this case generally triangular polycrystalline diamond elements 26, 27 are arranged in two rows around the arcuate side of the slug.
  • the polycrystalline diamond elements 26 in the outer row have one side thereof lying along the peripheral edge of the slug whereas the polycrystalline diamond elements 27 in the inner row have their apices directed outwardly and are interleaved between the outer polycrystalline diamond elements 26.
  • the cutter shown in Figures 6 a and 6 b comprises a generally cubic slug 28 of cemented tungsten carbide in which are embedded generally cubic polycrystalline diamond elements 29.
  • Figure 6 a is a front view of the cutter and it will be seen that on the front cutting face there are exposed two rows of polycrystalline diamond elements.
  • Figure 6 b is a side view of the cutter and it will be seen that a further row of polycrystalline diamond elements is disposed between the front face 30 and the rear face 31 of the slug.
  • the polycrystalline diamond elements 29 form a three-dimensional array of elements.
  • the cemented tungsten carbide slug 32 is in the form of a circular cylindrical tablet of constant thickness having three polycrystalline diamond elements 33 arranged around part of its periphery.
  • each polycrystalline diamond element has one face exposed in the front cutting face of the slug and one cutting face exposed at the periphery of the slug, but does not extend through the full thickness of the slug.
  • Figures 8 a and 8 b show a somewhat similar circular tablet 34 where the polycrystalline diamond elements comprise a central square element 35 between two triangular elements 36. Again the polycrystalline diamond elements extend only partly through the thickness of the slug and it will be appreciated that the layer of tungsten carbide behind each polycrystalline diamond element acts as a less hard backing layer to each element and thus provides a degree of self-sharpening for the cutter, taken as a whole.
  • Figure 9 shows another generally sector shaped slug in which are embedded four polycrystalline diamond elements 38 in the form of circular tablets of uniform thickness.
  • the apex of the sector is rounded, as indicated at 39, and one of the polycrystalline diamond elements lies at the apex closely adjacent the rounded portion.
  • the cutter is disposed on a drill bit so that the apex 39 first engages the formation.
  • Figure 10 shows a semi-circular slug 40 of tungsten carbide having alternating rectangular and triangular polycrystalline diamond inserts 41 and 42 around the arcuate portion of its periphery.
  • the tungsten carbide slug 43 is oblong having an arcuate portion 44 along one of its longer edges, along which edge are embedded, in close proximity to one another, rectangular polycrystalline diamond elements 45.
  • the polycrystalline diamond elements are closely adjacent one another so as to provide a substantially continuous polycrystalline diamond cutting edge to the cutter.
  • Figure 12 shows a somewhat similar form of cutter in which three elongate rectangular polycrystalline diamond elements 46 are disposed along the arcuate edge 47 of a generally oblong slug 48. Further square polycrystalline diamond elements 49 are embedded in the slug 48 inwardly of the elements 46.
  • Figure 13 shows a cutter 50 in the form of a circular tablet of constant thickness.
  • the cutter comprises a circular polycrystalline diamond element 51 embedded in a larger circular slug 52 of cemented tungsten carbide.
  • the cutter will be orientated on the drill bit so that the part of the cutter, indicated at 53, where the polycrystalline diamond is exposed at the surface of the slug first comes into contact with the formation being drilled.
  • the circular tablet cutter shown in Figure 13 may be used in any similar way to conventional two layer non thermally stable circular cutters.
  • Figures 14 and 15 show a typical form of cutting structure, for a rotary drill bit, in which cutters in accordance with the invention may be used.
  • the structure comprises a generally cylindrical stud 54 formed, for example, of cemented tungsten carbide.
  • the stud is formed, adjacent one end, with an inclined surface 55 leading to a rebate 56.
  • Received in the rebate 56 is a semicircular cutting element 57.
  • the cutter is of the type previously described and comprises elements 58 of thermally stable polycrystalline diamond embedded in a slug of cemented tungsten carbide. The cutter may be secured within the rebate 56 by brazing.
  • cutting structures generally of the kind shown in Figures 14 and 15 are mounted on the body of the rotary drill bit by securing the studs 54 within sockets in the bit body.
  • the studs may be secured in the sockets by brazing and/or shrink-fitting.
  • Any of the other forms of cutter previously described may also be mounted on studs, or other forms of carrier, to provide a cutting structure for mounting on a drill bit.
  • the cutters may, in some cases, be mounted directly on the bit body.
  • the polycrystalline diamond elements may extend wholly or only partly through the thickness of the slug of tungsten carbide. Although one surface of each element is preferably flush with the surface of the tungsten carbide slug, the invention includes within its scope arrangements in which some or all of the elements project from the surface of the slug to a certain extent.
  • the polycrystalline diamond elements may be of the kind in which the interstices between the diamond particles are filled with silicon material, i.e. silicon and/or silicon carbide, with or without the presence of other interstitial components, or may be of the kind in which the metallic interstitial components have been leached out and the element has been coated with protective material, such as nickel.
  • the slug is formed of cemented tungsten carbide using cobalt.
  • the polycrystalline diamond inserts are embedded in the slug during formation of the slug by a hot pressing process in a furnace, possibly, but not necessarily, in a vacuum or hydrogen atmosphere.
  • the temperature of formation of the cemented tungsten carbide is likely to be 1300°C to 1450°C for a brief period, but polycrystalline diamond material of the two kinds referred to may be thermally stable under such conditions.
  • suitable forms of thermally stable polycrystalline diamond material are that manufactured and sold by de Beers under the trade name "SYNDAX 3", and that sold under the trade name "GEOSET", when suitably coated.
  • SYNDAX 3 is currently produced in the form of large discs of 34 mm diameter and 2.5 mm or 3 mm in thickness.
  • the small polycrystalline diamond elements employed in the invention may be cut from such discs using a computer controlled laser or other suitable method.
  • the polycrystalline diamond elements may simply be held in the tungsten carbide slug mechanically but a metallurgical bond between the elements and the tungsten carbide may also be achieved by suitable coating, or further coating, of the polycrystalline diamond elements before they are embedded in the tungsten carbide.
  • the cost of each cutter may be less than the cost of a similar cutter formed entirely from polycrystalline diamond in view of the smaller volume of polycrystalline diamond employed.
  • the saving in cost is particularly great in the described arrangements where the polycrystalline diamond elements are located mainly in the vicinity of the cutting edge of the cutter and are not distributed over the entire cutting face of the cutter.
  • the invention also includes within its scope a cutter, for use in a rotary drill bit, comprising a number of thermally stable polycrystalline diamond elements at least partly embedded in a slug of less hard material, a majority of the polycrystalline diamond elements being located in the vicinity of the cutting edge of the cutter.
  • a cutter for use in a rotary drill bit, comprising a number of thermally stable polycrystalline diamond elements at least partly embedded in a slug of less hard material, a majority of the polycrystalline diamond elements being located in the vicinity of the cutting edge of the cutter.
  • Each polycrystalline diamond element may be of the kind in which the interstices between the diamond particles are substantially filled with silicon material, i.e. silicon or silicon carbide, and the slug is of tungsten carbide cemented with cobalt, or each polycrystalline diamond element may be of the kind in which the interstitial components have been leached out and the slug is of matrix material.
  • the arrangement of the polycrystalline diamond elements in the slug may, for example, be of any of the kinds described above with reference to Figures 1 to 8 or Figures 10 to 13 of the accompanying drawings.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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EP87304144A 1986-05-16 1987-05-11 Schneidelement für einen Drehbohrmeissel, Drehbohrmeissel mit derartigem Schneidelement und dessen Herstellungsverfahren Withdrawn EP0246789A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868612012A GB8612012D0 (en) 1986-05-16 1986-05-16 Rotary drill bits
GB8612012 1986-05-16

Publications (2)

Publication Number Publication Date
EP0246789A2 true EP0246789A2 (de) 1987-11-25
EP0246789A3 EP0246789A3 (de) 1988-12-14

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EP87304144A Withdrawn EP0246789A3 (de) 1986-05-16 1987-05-11 Schneidelement für einen Drehbohrmeissel, Drehbohrmeissel mit derartigem Schneidelement und dessen Herstellungsverfahren

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GB (2) GB8612012D0 (de)

Cited By (38)

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EP0291314A2 (de) * 1987-05-13 1988-11-17 Reed Tool Company Limited Schneidelement und Drehbohrmeissel mit einem derartigen Element
EP0336698A2 (de) * 1988-04-05 1989-10-11 Camco Drilling Group Limited Schneidelement für Drehbohrmeissel und dessen Herstellung
EP0350045A2 (de) * 1988-07-06 1990-01-10 Baker Hughes Incorporated Bohrmeissel mit Verbundschneidelementen
EP0554568A2 (de) * 1992-01-06 1993-08-11 Baker Hughes Incorporated Mosaik-"Drag-Bit"-Schneide mit ungleichem Verschleissprofil
US5820985A (en) * 1995-12-07 1998-10-13 Baker Hughes Incorporated PDC cutters with improved toughness
US5967249A (en) * 1997-02-03 1999-10-19 Baker Hughes Incorporated Superabrasive cutters with structure aligned to loading and method of drilling
US6009963A (en) * 1997-01-14 2000-01-04 Baker Hughes Incorporated Superabrasive cutting element with enhanced stiffness, thermal conductivity and cutting efficiency
GB2429471A (en) * 2005-02-08 2007-02-28 Smith International Thermally stable polycrystalline diamond cutting elements
WO2009146096A1 (en) * 2008-04-04 2009-12-03 Baker Hughes Incorporated Rotary drill bits and drilling tools having protective structures on longitudinally trailing surfaces
US20100281782A1 (en) * 2009-05-06 2010-11-11 Keshavan Madapusi K Methods of making and attaching tsp material for forming cutting elements, cutting elements having such tsp material and bits incorporating such cutting elements
US8083012B2 (en) 2008-10-03 2011-12-27 Smith International, Inc. Diamond bonded construction with thermally stable region
US8746371B2 (en) 2009-09-30 2014-06-10 Baker Hughes Incorporated Downhole tools having activation members for moving movable bodies thereof and methods of using such tools
US8844635B2 (en) 2011-05-26 2014-09-30 Baker Hughes Incorporated Corrodible triggering elements for use with subterranean borehole tools having expandable members and related methods
US8863843B2 (en) 2010-05-21 2014-10-21 Smith International, Inc. Hydraulic actuation of a downhole tool assembly
US8875810B2 (en) 2006-03-02 2014-11-04 Baker Hughes Incorporated Hole enlargement drilling device and methods for using same
US8881833B2 (en) 2009-09-30 2014-11-11 Baker Hughes Incorporated Remotely controlled apparatus for downhole applications and methods of operation
US8939236B2 (en) 2010-10-04 2015-01-27 Baker Hughes Incorporated Status indicators for use in earth-boring tools having expandable members and methods of making and using such status indicators and earth-boring tools
US8960333B2 (en) 2011-12-15 2015-02-24 Baker Hughes Incorporated Selectively actuating expandable reamers and related methods
US9038748B2 (en) 2010-11-08 2015-05-26 Baker Hughes Incorporated Tools for use in subterranean boreholes having expandable members and related methods
US9051792B2 (en) 2010-07-21 2015-06-09 Baker Hughes Incorporated Wellbore tool with exchangeable blades
US9068407B2 (en) 2012-05-03 2015-06-30 Baker Hughes Incorporated Drilling assemblies including expandable reamers and expandable stabilizers, and related methods
US9175520B2 (en) 2009-09-30 2015-11-03 Baker Hughes Incorporated Remotely controlled apparatus for downhole applications, components for such apparatus, remote status indication devices for such apparatus, and related methods
US9187959B2 (en) 2006-03-02 2015-11-17 Baker Hughes Incorporated Automated steerable hole enlargement drilling device and methods
US9187960B2 (en) 2006-12-04 2015-11-17 Baker Hughes Incorporated Expandable reamer tools
US9267331B2 (en) 2011-12-15 2016-02-23 Baker Hughes Incorporated Expandable reamers and methods of using expandable reamers
US9284816B2 (en) 2013-03-04 2016-03-15 Baker Hughes Incorporated Actuation assemblies, hydraulically actuated tools for use in subterranean boreholes including actuation assemblies and related methods
US9290998B2 (en) 2013-02-25 2016-03-22 Baker Hughes Incorporated Actuation mechanisms for downhole assemblies and related downhole assemblies and methods
US9297211B2 (en) 2007-12-17 2016-03-29 Smith International, Inc. Polycrystalline diamond construction with controlled gradient metal content
US9341027B2 (en) 2013-03-04 2016-05-17 Baker Hughes Incorporated Expandable reamer assemblies, bottom-hole assemblies, and related methods
US9387571B2 (en) 2007-02-06 2016-07-12 Smith International, Inc. Manufacture of thermally stable cutting elements
US9388638B2 (en) 2012-03-30 2016-07-12 Baker Hughes Incorporated Expandable reamers having sliding and rotating expandable blades, and related methods
US9394746B2 (en) 2012-05-16 2016-07-19 Baker Hughes Incorporated Utilization of expandable reamer blades in rigid earth-boring tool bodies
US9493991B2 (en) 2012-04-02 2016-11-15 Baker Hughes Incorporated Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods
US9611697B2 (en) 2002-07-30 2017-04-04 Baker Hughes Oilfield Operations, Inc. Expandable apparatus and related methods
US9677344B2 (en) 2013-03-01 2017-06-13 Baker Hughes Incorporated Components of drilling assemblies, drilling assemblies, and methods of stabilizing drilling assemblies in wellbores in subterranean formations
US10132121B2 (en) 2007-03-21 2018-11-20 Smith International, Inc. Polycrystalline diamond constructions having improved thermal stability
US10174560B2 (en) 2015-08-14 2019-01-08 Baker Hughes Incorporated Modular earth-boring tools, modules for such tools and related methods
CN110116221A (zh) * 2018-02-06 2019-08-13 姜文辉 一种以低钴含量烧结碳化钨为基体的聚晶金刚石复合片

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US5001138B1 (en) * 1985-02-04 1998-01-20 Bayer Agrochem Kk Heterocyclic compounds
US5004057A (en) * 1988-01-20 1991-04-02 Eastman Christensen Company Drill bit with improved steerability
US5027912A (en) * 1988-07-06 1991-07-02 Baker Hughes Incorporated Drill bit having improved cutter configuration
US4941538A (en) * 1989-09-20 1990-07-17 Hughes Tool Company One-piece drill bit with improved gage design
US5025873A (en) * 1989-09-29 1991-06-25 Baker Hughes Incorporated Self-renewing multi-element cutting structure for rotary drag bit
US5348108A (en) * 1991-03-01 1994-09-20 Baker Hughes Incorporated Rolling cone bit with improved wear resistant inserts
GB2309991B (en) * 1995-08-22 1997-10-29 Smith International A method of making multiple diamond layer polycrystalline diamond composite cutters
US5667028A (en) * 1995-08-22 1997-09-16 Smith International, Inc. Multiple diamond layer polycrystalline diamond composite cutters
US5979578A (en) * 1997-06-05 1999-11-09 Smith International, Inc. Multi-layer, multi-grade multiple cutting surface PDC cutter
GB9811705D0 (en) * 1998-06-02 1998-07-29 Camco Int Uk Ltd Preform cutting elements for rotary drill bits

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Also Published As

Publication number Publication date
GB2190412A (en) 1987-11-18
GB8612012D0 (en) 1986-06-25
EP0246789A3 (de) 1988-12-14
GB8710876D0 (en) 1987-06-10

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