WO1992014906A1 - Improvements relating to drill bits - Google Patents

Improvements relating to drill bits Download PDF

Info

Publication number
WO1992014906A1
WO1992014906A1 PCT/GB1992/000321 GB9200321W WO9214906A1 WO 1992014906 A1 WO1992014906 A1 WO 1992014906A1 GB 9200321 W GB9200321 W GB 9200321W WO 9214906 A1 WO9214906 A1 WO 9214906A1
Authority
WO
WIPO (PCT)
Prior art keywords
pdc
elliptical
oval
post
drill bit
Prior art date
Application number
PCT/GB1992/000321
Other languages
French (fr)
Inventor
Neil Andrew Abercrombie Simpson
James Bain
Original Assignee
Brit Bit Limited
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 Brit Bit Limited filed Critical Brit Bit Limited
Publication of WO1992014906A1 publication Critical patent/WO1992014906A1/en

Links

Classifications

    • 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
    • E21B10/5673—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a non planar or non circular cutting face

Definitions

  • the present invention relates to drill bits for use in
  • the substrate being a circular disc or cylinder
  • the substrate which is a tungsten carbide
  • 24 layer typically varies in thickness from 3 mm to 13
  • the cylindrical shape of the PDC's facilitates their attachment to the bit body, which is done in one of two basic ways: either the PDC is brazed directly into preformed circular holes in the bit body, or it is high temperature brazed onto a cylindrical post or stud (also of tungsten carbide) which in turn is press fitted or brazed into preformed circular holes in the bit body.
  • the circular configuration of the PDC's simplifies the formation of the corresponding holes in the bit body using conventional machine tools, and in the latter case it similarly simplifies manufacture of the posts.
  • the objects of the present invention include obviating or mitigating the abovementioned disadvantages of existing PDC's and of drill bits incorporating such PDC's.
  • a polycrystalline diamond compact comprising a polycrystalline diamond layer affixed to a substrate, said substrate being generally elliptical or oval and having a major axis and a minor axis.
  • major axis means the axis along the largest edge-to-edge dimension of an elliptical or oval body and "minor axis” means the axis along the largest edge-to-edge dimension in a direction at right angles to the major axis.
  • the invention provides a post-mounted PDC, comprising an elliptical or oval PDC as defined above, mounted on a post having a corresponding cross-sectional shape.
  • the invention provides a drill bit comprising a drill bit body having preformed elliptical or oval holes formed therein and having a plurality of elliptical or oval PDC's mounted in said holes with the major axes of the PDC's extending outwards from the surface of the bit body.
  • the PDC's may either be mounted directly in the holes or may be post-mounted, the posts being mounted in the holes.
  • the elliptical or oval PDC's are cut from a circular PDC disc.
  • bit body with said elliptical or oval holes formed therein is produced by investment casting.
  • the elliptical or oval cross-section posts for post-mounted PDC's may be produced in a similar manner.
  • Fig. 1 is a schematic cross-sectional view of part of a drill bit body showing a comparison between the use of conventional, circular PDC's and elliptical or oval PDC's in accordance with the present invention
  • Fig. 2 is an end elevation of a PDC in accordance with the present invention
  • Fig. 3 is a side view of a first PDC having an end elevation as seen in Fig. 2
  • Fig. 4 is a side view of a second, post-mounted PDC also having an end elevation as seen in Fig. 2
  • Fig. 5 is a plan view of a PDC disc showing the manner in which nested PDC's as seen in Figs. 2, 3 and 4 may be cut from disc; and Figs.
  • FIG. 6, 7, 8 and 9 are views corresponding to Figs. 2, 3, 4, and 5 for PDC's in accordance with the invention having different dimensions from the first and second PDC's.
  • Fig. «. shows a sectional view of part- of a drill bit body 10, having a plurality of PDC's 12 mounted around the periphery thereof in correspondingly shaped holes or recesses.
  • the drawing shows both conventional, circular PDC's, 12a, and elliptical PDC's, 12b.
  • the minor axes of the elliptical PDC's 12(b) are equal in length to the diameters of the circular PDC's 12(a) and the major axes of the elliptical PDC's 12b extend outwardly from the surface of the bit body 10.
  • Fig. 2 shows an end elevation of an elliptical I-DC 14 in accordance with the invention, having a major axis dimension of 13.44 mm and a minor axis dimension of 11.318 mm, i.e. an aspect'ratio of approximately 1.2.
  • Fig. 3 shows a side view of a first PDC 16 comprising a polycrystalline diamond layer 18 (0.5 mm in thickness) on a tungsten carbide substrate 20, (giving an overall thickness of 8 mm) , and having a cross-sectional shape as seen in Fig. 2.
  • FIG. 4 shows a post-mounted PDC 22 comprising a diamond layer 24 on a substrate 26 (giving an overall thickness of 3 mm) , located on a tungsten carbide post 2 (resulting in an overall length of 20 mm) and again having the cross-sectional shape seen in Fig. 2.
  • Fig. 5 shows the manner in which a plurality of PDC's of this shape may be cut from a 2 inch PDC disc 30. 11 such cutters can be obtained from a 2 inch diameter disc, utilising 64.8% of the total disc area, as compared with 9 circular 13.4 mm diameter PDC's which could be obtained, utilising 62.99% of the disc area.
  • Figs. 6 to 9 are equivalent illustrations for a 19.05 mm by 13.44 mm PDC 32 (having an aspect ratio of approximately 1:4), Fig. 7 showing a PDC 34 having a diamond layer 36 and substrate 38, Fig. 8 a post-mounted PDC 40 having a diamond layer 42, substrate 44 and post 46, and Fig. 9 showing the nesting of such PDC's on a 2 inch PDC disc 48.
  • 5 PDC's are obtained from the disc, utilising 59.53% of its area in comparison with 4 circular, 19 mm diameter PDC's which could be obtained, utilising 56.25% of the area.
  • the edge of the polycrystalline diamond layer 18 may be chamfered or radiused along at least a part of its periphery adjacent that end of the major axis which projects outwardly from the bit body in use, preferably along a chord determined by the chamfer angle and diamond layer thickness as indicated by lines 50 and 52. This reduces the possibility of the PDC fracturing upon first use.
  • bit bodies with elliptical or oval cutter recesses is advantageously accomplished using investment casting techniques such as are disclosed in WO90/01384.
  • investment casting techniques such as are disclosed in WO90/01384.
  • conventional steel and matrix techniques might also be employed.
  • the elliptical or oval PDC's themselves can be cut from large circular PDC discs using EDM wire cutting techniques, and with efficient nesting might be produced at slightly lower cost than equivalent circular PDC's.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)

Abstract

A polycrystalline diamond cutter (PDC) (12) is described which is elliptical or oval, rather than circular, in shape, having a major axis which extends outwardly from the drill bit body (10) when in use. The elliptical or oval shape of the PDC provides advantages in terms of the rate of development of the wear flat, the weight on bit requirement, and the useful cutting area and cooling characteristics of the PDC in comparison with circular configurations. The PDC's may be post mounted. Drill bits incorporating the PDC and methods of forming suitable bit bodies and mounting posts are also described.

Description

f.
1 "Improvements Relating to Drill Bits" 2
3 The present invention relates to drill bits for use in
4 oil drilling or the like and is particularly concerned
5 with improvements in polycrystalline diamond cutting
6 products for use in such drill bits. 7
8 Polycrystalline Diamond Compacts (PDC's), or cutters,
9 generally comprise a polycrystalline diamond layer
10 affixed to a tungsten carbide substrate, a plurality of
11 PDC's being mounted in a bit body to produce a
12 functional drill bit. Conventional PDC's are circular,
13 the substrate being a circular disc or cylinder, this
14 shape being determined by a number of factors, as
15 follows: 16
17 (a) Manufacture of the PDC's requires ultra high
18 pressures and temperatures, and a cylindrical vessel
19 provides the best solution for the containment of these
20 high pressures. Early PDC's had a diameter of 13 mm
21 (1/2 inch). However, much larger PDC's are now
22 produced. The substrate, which is a tungsten carbide
23 support material behind the polycrystalline diamond
24 layer, typically varies in thickness from 3 mm to 13
25 mm. (b) The cylindrical shape of the PDC's facilitates their attachment to the bit body, which is done in one of two basic ways: either the PDC is brazed directly into preformed circular holes in the bit body, or it is high temperature brazed onto a cylindrical post or stud (also of tungsten carbide) which in turn is press fitted or brazed into preformed circular holes in the bit body. In either case the circular configuration of the PDC's simplifies the formation of the corresponding holes in the bit body using conventional machine tools, and in the latter case it similarly simplifies manufacture of the posts.
There are, however, a number of disadvantages in using cylindrical PDC's.
(i) The generation of the wear flat is not ideal as it starts from a point contact which rapidly grows in the form of a chord to the circular diameter diamond layer on the face of the PDC cutter.
(ϋ) The weight on bit requirement to maintain constant loading on the diamond layer rapidly increases with the area of the wear flat.
(ϋi) The temperature of the cutter increases with the development of the wear flat and the mud's ability to cool the cutter drops.
(iv) The spacing between cutters is restricted by their diameter and additionally, in the case of post-mounted cutters, by the diameter of the post, its depth of setting, and the curvature of the bit body upon which it is set. (v) In mounting cylindrical PDC's on a bit body there is a trade off between the depth of setting and the remaining cutter exposure; cylindrical cutters are usually set at or below the waist, leaving only half or less than half of the diameter exposed.
The objects of the present invention include obviating or mitigating the abovementioned disadvantages of existing PDC's and of drill bits incorporating such PDC's.
According to a first aspect of the invention, there is provided a polycrystalline diamond compact (PDC) comprising a polycrystalline diamond layer affixed to a substrate, said substrate being generally elliptical or oval and having a major axis and a minor axis.
In the present disclosure the term "major axis" means the axis along the largest edge-to-edge dimension of an elliptical or oval body and "minor axis" means the axis along the largest edge-to-edge dimension in a direction at right angles to the major axis.
According to a second aspect, the invention provides a post-mounted PDC, comprising an elliptical or oval PDC as defined above, mounted on a post having a corresponding cross-sectional shape.
According to a third aspect, the invention provides a drill bit comprising a drill bit body having preformed elliptical or oval holes formed therein and having a plurality of elliptical or oval PDC's mounted in said holes with the major axes of the PDC's extending outwards from the surface of the bit body. The PDC's may either be mounted directly in the holes or may be post-mounted, the posts being mounted in the holes.
Preferably, the elliptical or oval PDC's are cut from a circular PDC disc.
Preferably also, the bit body with said elliptical or oval holes formed therein is produced by investment casting. The elliptical or oval cross-section posts for post-mounted PDC's may be produced in a similar manner.
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-
Fig. 1 is a schematic cross-sectional view of part of a drill bit body showing a comparison between the use of conventional, circular PDC's and elliptical or oval PDC's in accordance with the present invention; Fig. 2 is an end elevation of a PDC in accordance with the present invention; Fig. 3 is a side view of a first PDC having an end elevation as seen in Fig. 2; Fig. 4 is a side view of a second, post-mounted PDC also having an end elevation as seen in Fig. 2; Fig. 5 is a plan view of a PDC disc showing the manner in which nested PDC's as seen in Figs. 2, 3 and 4 may be cut from disc; and Figs. 6, 7, 8 and 9 are views corresponding to Figs. 2, 3, 4, and 5 for PDC's in accordance with the invention having different dimensions from the first and second PDC's. Referring n ' to the drawings, Fig. «. shows a sectional view of part- of a drill bit body 10, having a plurality of PDC's 12 mounted around the periphery thereof in correspondingly shaped holes or recesses. For purposes of comparison, the drawing shows both conventional, circular PDC's, 12a, and elliptical PDC's, 12b. As can be seen, the minor axes of the elliptical PDC's 12(b) are equal in length to the diameters of the circular PDC's 12(a) and the major axes of the elliptical PDC's 12b extend outwardly from the surface of the bit body 10.
The use of elliptical or oval PDC's in accordance with the invention provides the following advantages in comparison with equivalent circular PDC's:
(a) The rate at which the area of the wear flat develops as the PDC is worn away can be considerably reduced in comparison with circular PDC's.
(b) The weight on bit required to maintain constant loading on the diamond layer does not have to be increased so significantly due to the slower development of the wear flat.
(c) The area of the PDC's exposed to the cooling effects of drilling mud is increased in comparison with circular PDC's.
(d) A greater overall cutting surface is available in comparison with circular PDC's owing to closer spacing of PDC's and/or the greater exposed areas of individual PDC's.
Fig. 2 shows an end elevation of an elliptical I-DC 14 in accordance with the invention, having a major axis dimension of 13.44 mm and a minor axis dimension of 11.318 mm, i.e. an aspect'ratio of approximately 1.2. Fig. 3 shows a side view of a first PDC 16 comprising a polycrystalline diamond layer 18 (0.5 mm in thickness) on a tungsten carbide substrate 20, (giving an overall thickness of 8 mm) , and having a cross-sectional shape as seen in Fig. 2. Fig. 4 shows a post-mounted PDC 22 comprising a diamond layer 24 on a substrate 26 (giving an overall thickness of 3 mm) , located on a tungsten carbide post 2 (resulting in an overall length of 20 mm) and again having the cross-sectional shape seen in Fig. 2.
Fig. 5 shows the manner in which a plurality of PDC's of this shape may be cut from a 2 inch PDC disc 30. 11 such cutters can be obtained from a 2 inch diameter disc, utilising 64.8% of the total disc area, as compared with 9 circular 13.4 mm diameter PDC's which could be obtained, utilising 62.99% of the disc area.
Figs. 6 to 9 are equivalent illustrations for a 19.05 mm by 13.44 mm PDC 32 (having an aspect ratio of approximately 1:4), Fig. 7 showing a PDC 34 having a diamond layer 36 and substrate 38, Fig. 8 a post-mounted PDC 40 having a diamond layer 42, substrate 44 and post 46, and Fig. 9 showing the nesting of such PDC's on a 2 inch PDC disc 48. In this case, 5 PDC's are obtained from the disc, utilising 59.53% of its area in comparison with 4 circular, 19 mm diameter PDC's which could be obtained, utilising 56.25% of the area.
Referring back to Figs. 2 and 3, the edge of the polycrystalline diamond layer 18 may be chamfered or radiused along at least a part of its periphery adjacent that end of the major axis which projects outwardly from the bit body in use, preferably along a chord determined by the chamfer angle and diamond layer thickness as indicated by lines 50 and 52. This reduces the possibility of the PDC fracturing upon first use.
The production of bit bodies with elliptical or oval cutter recesses is advantageously accomplished using investment casting techniques such as are disclosed in WO90/01384. However, conventional steel and matrix techniques might also be employed. The elliptical or oval PDC's themselves can be cut from large circular PDC discs using EDM wire cutting techniques, and with efficient nesting might be produced at slightly lower cost than equivalent circular PDC's.
Modifications and improvements may be incorporated without departing from the scope of the invention.
MURGITROYD AND COMPANY CHARTERED PATENT AGENTS MITCHELL HOUSE 333 BATH STREET GLASGOW G2 4ER

Claims

1
1 CLAIMS 2
3 1. A polycrystalline diamond compact (PDC) comprising
4 a polycrystalline diamond layer affixed to a substrate,
5 said substrate being generally elliptical or oval and
6 having a major axis and a minor axis, wherein the term
7 "major axis" means the axis along the largest
8 edge-to-edge dimension of an elliptical or oval body
9 and "minor axis" means the axis along the largest
10 edge-to-edge dimension in a direction perpendicular to
11 the major axis. 12
13 2. A PDC as claimed in Claim 1, wherein the ratio of
14 the length of said major axis to said minor axis is in
15 the range 1.2 to 1.4. 16
17 3. A PDC as claimed in Claim 1, wherein at least a
18 portion of the edge of said polycrystalline diamond
19 layer adjacent one end of said major axis is chamfered
20 or radiused. 21
22 4. A method of forming PDC's as claimed in any of
23 Claims 1 to 3, wherein a plurality of said oval or
24 elliptical PDC's are cut from a circular PDC disc. 25
26 5. A post-mounted PDC, comprising an elliptical or
27 oval PDC as claimed in any of Claims 1 to 3, mounted on
28 a post having a corresponding cross-sectional shape. 29
30 6. A drill bit comprising a drill bit body having
31 preformed elliptical or oval holes formed therein and
32 having a plurality of PDC's as claimed in any of Claims
33 1 to 3 or 5 mounted in said holes with the major axes
34 of the PDC's extending outwards from the surface of the
35 bit body. 7. A drill bit as claimed in Claim 6, wherein said PDC's are mounted directly in said holes.
8. A drill bit as claimed in Claim 6, wherein said PDC's are post-mounted and said posts are mounted in said holes.
9. A method of forming a post-mounted PDC as claimed in Claim 5, wherein said post is formed by investment casting.
10. A method of forming a drill bit as claimed in Claim 6 , wherein said bit body is formed by investment casting.
PCT/GB1992/000321 1991-02-23 1992-02-21 Improvements relating to drill bits WO1992014906A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919103828A GB9103828D0 (en) 1991-02-23 1991-02-23 Improvements relating to drill bits
GB9103828.1 1991-02-23

Publications (1)

Publication Number Publication Date
WO1992014906A1 true WO1992014906A1 (en) 1992-09-03

Family

ID=10690481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/000321 WO1992014906A1 (en) 1991-02-23 1992-02-21 Improvements relating to drill bits

Country Status (3)

Country Link
EP (1) EP0571464A1 (en)
GB (1) GB9103828D0 (en)
WO (1) WO1992014906A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5429199A (en) * 1992-08-26 1995-07-04 Kennametal Inc. Cutting bit and cutting insert
US5505272A (en) * 1993-05-21 1996-04-09 Clark; Ian E. Drill bits
BE1011666A5 (en) * 1993-04-08 1999-12-07 Baker Hughes Inc Element for stud drill drill cutting.
EP1251239A3 (en) * 2001-04-05 2002-12-18 Smith International, Inc. Drill bit having large diameter pdc cutters
WO2008006010A2 (en) * 2006-07-07 2008-01-10 Baker Hughes Incorporated Cutters for downhole cutting devices
WO2008006170A1 (en) * 2006-07-12 2008-01-17 Omni Oil Technologies A pdc drag bit
GB2440448A (en) * 2006-07-24 2008-01-30 Smith International A cutter insert having a geometry for an increased bit life, a method of forming such a cutter and a bit incorporating such a cutter.
WO2009006510A2 (en) 2007-07-02 2009-01-08 Baker Hughes Incorporated Pdc cutter with oval cross-section
US9309724B2 (en) 2011-11-11 2016-04-12 Baker Hughes Incorporated Cutting elements having laterally elongated shapes for use with earth-boring tools, earth-boring tools including such cutting elements, and related methods
US9770807B1 (en) 2009-03-05 2017-09-26 Us Synthetic Corporation Non-cylindrical polycrystalline diamond compacts, methods of making same and applications therefor
US10508503B2 (en) 2016-09-23 2019-12-17 Baker Hughes, A Ge Company, Llc Cutting elements, earth-boring tools including the cutting elements, and methods of forming the earth-boring tools

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117241A1 (en) * 1983-02-18 1984-08-29 Strata Bit Corporation Drill bit and improved cutting element
EP0154936A2 (en) * 1984-03-16 1985-09-18 Eastman Christensen Company An exposed polycrystalline diamond mounted in a matrix body drill bit
EP0156235A2 (en) * 1984-03-26 1985-10-02 Eastman Christensen Company Multi-component cutting element using consolidated rod-like polycrystalline diamond
EP0188360A1 (en) * 1985-01-15 1986-07-23 Reed Tool Company Limited Improvements in or relating to cutting assemblies for rotary drill bits
US4632196A (en) * 1983-02-18 1986-12-30 Strata Bit Corporation Drill bit with shrouded cutter
WO1990001384A1 (en) * 1988-08-02 1990-02-22 Astec Developments Limited Investment casting process

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117241A1 (en) * 1983-02-18 1984-08-29 Strata Bit Corporation Drill bit and improved cutting element
US4632196A (en) * 1983-02-18 1986-12-30 Strata Bit Corporation Drill bit with shrouded cutter
EP0154936A2 (en) * 1984-03-16 1985-09-18 Eastman Christensen Company An exposed polycrystalline diamond mounted in a matrix body drill bit
EP0156235A2 (en) * 1984-03-26 1985-10-02 Eastman Christensen Company Multi-component cutting element using consolidated rod-like polycrystalline diamond
EP0188360A1 (en) * 1985-01-15 1986-07-23 Reed Tool Company Limited Improvements in or relating to cutting assemblies for rotary drill bits
WO1990001384A1 (en) * 1988-08-02 1990-02-22 Astec Developments Limited Investment casting process

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5429199A (en) * 1992-08-26 1995-07-04 Kennametal Inc. Cutting bit and cutting insert
BE1011666A5 (en) * 1993-04-08 1999-12-07 Baker Hughes Inc Element for stud drill drill cutting.
US5505272A (en) * 1993-05-21 1996-04-09 Clark; Ian E. Drill bits
EP1251239A3 (en) * 2001-04-05 2002-12-18 Smith International, Inc. Drill bit having large diameter pdc cutters
US6808031B2 (en) 2001-04-05 2004-10-26 Smith International, Inc. Drill bit having large diameter PDC cutters
WO2008006010A3 (en) * 2006-07-07 2008-05-08 Baker Hughes Inc Cutters for downhole cutting devices
GB2453472B (en) * 2006-07-07 2011-05-25 Baker Hughes Inc Cutters for downhole cutting devices
WO2008006010A2 (en) * 2006-07-07 2008-01-10 Baker Hughes Incorporated Cutters for downhole cutting devices
GB2453472A (en) * 2006-07-07 2009-04-08 Baker Hughes Inc Cutters for downhole cutting devices
WO2008006170A1 (en) * 2006-07-12 2008-01-17 Omni Oil Technologies A pdc drag bit
GB2440448A (en) * 2006-07-24 2008-01-30 Smith International A cutter insert having a geometry for an increased bit life, a method of forming such a cutter and a bit incorporating such a cutter.
US8096372B2 (en) 2006-07-24 2012-01-17 Smith International, Inc. Cutter geometry for increased bit life and bits incorporating the same
GB2440448B (en) * 2006-07-24 2009-08-12 Smith International Cutter geometry for increased bit life and bits incorporating the same
WO2009006510A3 (en) * 2007-07-02 2010-04-01 Baker Hughes Incorporated Pdc cutter with oval cross-section
WO2009006510A2 (en) 2007-07-02 2009-01-08 Baker Hughes Incorporated Pdc cutter with oval cross-section
US9770807B1 (en) 2009-03-05 2017-09-26 Us Synthetic Corporation Non-cylindrical polycrystalline diamond compacts, methods of making same and applications therefor
US9309724B2 (en) 2011-11-11 2016-04-12 Baker Hughes Incorporated Cutting elements having laterally elongated shapes for use with earth-boring tools, earth-boring tools including such cutting elements, and related methods
US10047569B2 (en) 2011-11-11 2018-08-14 Baker Hughes Incorporated Cutting elements having laterally elongated shapes for use with earth-boring tools, earth-boring tools including such cutting elements, and related methods
US10508503B2 (en) 2016-09-23 2019-12-17 Baker Hughes, A Ge Company, Llc Cutting elements, earth-boring tools including the cutting elements, and methods of forming the earth-boring tools

Also Published As

Publication number Publication date
GB9103828D0 (en) 1991-04-10
EP0571464A1 (en) 1993-12-01

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