GB2274474A - Cutter assemblies for rotary drill bits - Google Patents
Cutter assemblies for rotary drill bits Download PDFInfo
- Publication number
- GB2274474A GB2274474A GB9301146A GB9301146A GB2274474A GB 2274474 A GB2274474 A GB 2274474A GB 9301146 A GB9301146 A GB 9301146A GB 9301146 A GB9301146 A GB 9301146A GB 2274474 A GB2274474 A GB 2274474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutting element
- cutter
- cutter assembly
- stud
- bit
- 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.)
- Granted
Links
- 238000000429 assembly Methods 0.000 title claims description 26
- 230000000712 assembly Effects 0.000 title claims description 26
- 238000005520 cutting process Methods 0.000 claims description 76
- 238000000034 method Methods 0.000 claims description 32
- 239000010432 diamond Substances 0.000 claims description 23
- 229910003460 diamond Inorganic materials 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 18
- 239000011159 matrix material Substances 0.000 claims description 17
- 230000008595 infiltration Effects 0.000 claims description 14
- 238000001764 infiltration Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 13
- 230000015556 catabolic process Effects 0.000 claims description 12
- 238000006731 degradation reaction Methods 0.000 claims description 12
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 12
- 238000005219 brazing Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- 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
Description
2274474 11Improvements in or relating to Cutter Assemblies for Rotary
Drill Bits" The invention relates to cutter assemblies for rotary drag-type drill bits, for use in drilling or coring holes in sub-surface formations, and of the kind comprising a bit body having a shank for connection to a drill string, a plurality of cutter assemblies mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body for cooling and/or cleaning the cutter assemblies.
In drag-type drill bits of this kind the bit body may be machined from metal, usually steel, sockets to receive the cutter assemblies being drilled into the bit body. Alternatively, the bit body may be formed by a powder metallurgy process. In this process a hollow mould is formed, for example from graphite, in the configuration of the bit body or a part thereof. The mould is packed with powdered matrix-forming material, such as powdered tungsten carbide, which is then infiltrated with a metal alloy, such as a copper alloy, in a furnace so as to form a hard matrix. Using conventional infiltration alloys, the furnace temperature required to form the matrix is usually of the order of 1000C to 11700C.
The present invention relates to the manufacture of cutter assemblies of the kind in which a preform polycrystalline diamond cutting element is mounted on a carrier of material which is less hard than the diamond, the carrier then in turn being secured within a socket in the bit body.
A common form of cutting element comprises a flat tablet, usually circular, having a front cutting table of polycrystalline diamond bonded to a substrate of 5 less hard material, such as cemented tungsten carbide. The layer of polycrystalline diamond is formed and bonded to the substrate in a high pressure, high temperature press, and one or more transition layers may sometimes be provided between the cutting table and substrate. The general details of manufacture of such cutting elements are well known and do not form a part of the present invention.
The carrier is usually in the form of a cylindrical post or stud and may, for example, also be formed from cemented tungsten carbide. Each cutting element is normally mounted on its carrier by brazing the rear surface of the substrate to a surface of the carrier. However, two-layer and multi-layer cutting elements of the kind described tend to degrade when subjected to very high temperatures, and in this case they are therefore often referred to as being non-thermally stable. As the temperature to which the cutting elements are subjected increases, differential expansion between the layers of the element may cause delamination or separation of the diamond layer from the substrate. Very high temperatures may also lead to degradation of the polycrystalline diamond material itself. In view of this, special brazing processes have to be used when brazing such a nonthermally stable cutting element to its carrier, to ensure that unacceptable degradation of the cutting element does not occur. one such brazing process is known as IlLS bonding".
There also exist polycrystalline diamond cutting elements which are referred to as thermally stable. These normally consist of only a single body of polycrystalline diamond of a particular type, not bonded to a substrate.
Currently, conventional two-layer or multi-layer cutting elements are usually regarded as not being thermally stable above a temperature of about 750C. However, it will be appreciated that, for any given cutting element, there is not an exact critical temperature at which thermal degradation suddenly occurs, and it is possible that some "non-thermally stable" cutting elements might, in practice, be able to withstand temperatures somewhat in excess of 7500C. For the purposes of this specification, therefore, "thermally stable" cutting elements will mean polycrystalline diamond cutting elements which can be subjected to some temperature in excess of about 10000C without suffering significant thermal degradation, whereas cutting elements which would begin to suffer significant thermal degradation at any temperature up to about 10000C will be referred to as "non-thermally stableO.
An object of the invention is to provide a method of manufacturing cutter assemblies incorporating non-thermally stable cutting elements where the risk of thermal degradation of the cutting elements is reduced.
According to the invention there is provided a method of forming a cutter assembly for a rotary drill bit comprising locating in a mould a preform polycrystalline diamond cutting element of a kind which is non-thermally stable, as hereinbefore defined, packing powdered matrixforming material around at least part of the cutting element within the mould, and infiltrating the material with a metal alloy in a furnace to form a body of solid infiltrated matrix in which the cutting element is at least partly embedded, the metal alloy being selected to provide an infiltration temperature which is not greater than the temperature at which significant thermal degradation of the cutting element would occur.
Preferably the infiltration temperature is not greater than 8500C, and more preferably not greater than 7500C.
Accordingly, the comparatively low temperature infiltration does not cause significant thermal degradation of the polycrystalline diamond cutting element, but produces a carrier, formed of solidified matrix material, to which the cutting element is firmly secured.
The cutting element may be a two-layer or multi- layer element including a front cutting table of polycrystalline diamond bonded to a substrate of less hard material, such as cemented tungsten carbide. As previously mentioned, the cutting element may be in the f orm of a tablet, f or example circular or part-circular, of substantially constant thickness.
Preferably the mould is so shaped that the body of matrix material is in the form of a generally cylindrical stud, preferably of circular cross section, the cutting element having an edge portion projecting from one end of the stud and providing the cutting edge of the finished assembly.
In the case where the cutting element is in the form of a flat tablet, the cutting element may be inclined at an angle, for example 45, to the longitudinal axis of the stud. The central axis of the cutting element may be coincident with the longitudinal axis of the stud.
Superhard particles, such as natural diamonds, may be located in the mould, adjacent the cutting element, so as to become embedded in the matrix material of the finished body of the cutter assembly. Preferably the superhard particles are embedded in a part of the body of matrix material which, in use of the cutter assembly, is disposed rearwardly of the cutting element with respect to the normal direction of forward movement of the cutter assembly.
The invention includes within its scope a cutter assembly for a rotary drill bit, when manufactured by any of the methods referred to above.
The invention also includes a drill bit of the kind first referred to wherein at least certain of the cutter assemblies mounted on the bit body are formed by -Q- any of the methods referred to above. In such a drill bit, one or more cutter assemblies according to the invention may comprise secondary backup cutter assemblies associated with and placed rearwardly of respective 5 primary cutter assemblies on the bit body.
The following is more detailed description of embodiments of the invention, reference being made to the accompanying drawings in which:
Figure 1 is a side elevation of a typical drag bit in which cutter assemblies according to the present invention may be used, Figure 2 is an end elevation of the drill bit shown in Figure 1, Figure 3 is a diagrammatic side elevation of a typical prior art polycrystalline diamond cutter assembly,
Figure 4 is a side elevation of one form of cutter assembly manufactured according to the present invention, Figure 5 is a diagrammatic vertical section through a mould in the process of forming a cutter assembly according to the present invention, Figure 6 is a diagrammatic section through part of a drill bit body showing a cutter assembly according to the present invention in use as a backup to a conventional cutter assembly, Figure 7 is a longitudinal section through another form of cutter assembly according to the present invention, taken along the line 7-7 of Figure 8, Figure 8 is a front elevation of the cutter assembly of Figure 7, and Figure 9 is an end elevation of the cutter assembly of Figures 7 and 8.
Figures 1 and 2 show a typical full bore drag bit of a kind in which cutter assemblies according to the present invention may be employed. The bit body 1 is machined from steel and has a shank formed with an externally threaded pin 2 at one end for connection to the drill string. The operative end face 3 of the bit body is formed with a number of blades 4 radiating from the central area of the bit, and the blades carry cutter assemblies 5 spaced apart along the length thereof. The bit has a gauge section including kickers 6 which contact the walls of the borehole to stabilize the bit in the borehole. A central passage (not shown) in the bit body and shank delivers drilling fluid through nozzles 7 in the end face 3 in known manner.
Each cutter assembly 5 comprises a preform cutting element 8 mounted on a carrier 9 in the f orm of a post which is secured within a socket in the bit body. Each preform cutting element is in the form of a circular tablet comprising a thin facing table of polycrystalline diamond bonded to a substrate of cemented tungsten carbide. The rear surface of the substrate is bonded, for example by brazing, to a suitably orientated surface on the post 9.
Figure 3 is a side elevation showing one form of typical prior art cutter assembly in greater detail. The cutting element 8 comprises a cutting table 10 of polycrystalline diamond having a front cutting face 11, a peripheral surface 12 and a rear face 13 bonded to a substrate 14 of cemented tungsten carbide or other material which is less hard than the polycrystalline diamond. The rear surface of the substrate 14 is bonded, for example by the brazing process known as IlLS bonding" to an inclined surface 15 on the carrier or post 9. The post 9 may also be formed from cemented tungsten carbide.
The cutting edge 16 of the cutting element 8 comprises the lowermost portion of the junction between the front cutting face 11 and the peripheral surface 12 of the diamond layer.
Figures 4 and 5 show how a cutting element of the kind used in the cutter assembly of Figure 3 nay be employed in a cutter assembly in accordance with the present invention.
Referring to Figure 4, which is a side elevation of a cutter assembly according to the invention, the cutting element 8 is partly embedded in a cylindrical post-like body 17 of solid infiltrated matrix material. It will be seen from Figure 4 that a thin layer of the matrix material extends across each side of the cutting element 8, as indicated at 19, to provide additional support therefore. Figure 5 shows diagrammatically the manner in which the cutter assembly is formed. There is provided a two-part mould formed of suitable material, such as graphite, and providing a generally cylindrical mould cavity 22. A flat inclined abutment 23 is formed in the lower part of the mould to support the cutting element 8 in the required rotational and angular orientation. The mould is then packed, around the cutting element 8, with a powdered matrix-forming material, such as tungsten carbide. Space is left within the cavity 22, and above the powdered material, to receive a suitable infiltration metal alloy, usually in the form of a solid disc of such alloy. The mould is then placed in a furnace so that the metal alloy melts and infiltrates downwardly through the tungsten carbide powder to bond the particles together to form a hard matrix in which the cutting element 8 is embedded and thus secured. The process is generally similar in principle to the powder metallurgy process often employed for moulding bit bodies, as previously mentioned.
However, as previously described, conventional cutting elements of the kind shown are not normally thermally stable at temperatures above about 7500C, and any cutting element which begins to suffer significant thermal degradation at any temperature up to about 10000C is also regarded as being non-thermally stable. In the normal infiltration process for forming bit bodies, the infiltration alloy is usually such that an infiltration temperature in the range of 1100C to 1170C is required. As previously mentioned, such temperatures would cause serious degradation of a non-thermally stable cutting element. According to the present invention, therefore, the metal alloy selected for the infiltration process has an infiltration temperature which is not greater than the temperature which the cutting element can withstand and is preferably not greater than about 850C. The matrixforming process can then take place without significant thermal degradation of the cutting element.
Various suitable low temperature infiltration alloys are available. For example, one such low temperature alloy comprises 45% silver, 15-% copper, 16% zinc and 24% cadmium. However, such alloy is comparatively costly as a result of its high silver content. A preferred low temperature infiltrating alloy, therefore, is of any of the kinds described in US Patent Specification No. 4669522 where the alloy is a copper based alloy containing phosphorous. For example the alloy may be of substantially eutectic composition comprising approximately 8.4% phosphorous in a copper base. Alternatively, the alloy may comprise approximately 85% copper, up to 10% tin and up to 10% phosphorous. Other copper-phosphorous alloys are described which also contain silver.
Although tungsten carbide is preferred as the matrix-forming material, the invention does not exclude other materials or combinations of materials. For example, it may be advantageous to include particles of tungsten metal with the tungsten carbide.
Although cutter assemblies according to the invention may be used as primary cutters on a drill bit, they may also be used as secondary or backup cutter assemblies associated with primary cutter assemblies of known kinds, such the kind shown in Figure 3.
Figure 6 shows diagrammatically an arrangement in which a cutter assembly according to the present invention, indicated at 24, is located rearwardly of a conventional cutter assembly, indicated at 25. The backup assembly 24 then operates in the usual way for such backup assemblies in so called "hybrid" bits. That is to say it serves to provide a backup cutting function in the event of excessive wear or failure of the primary cutter assembly 25, and also serves to protect the primary cutter against impact damage and also to limit the depth to which the primary cutter bites into the formation.
In order to enhance the backup effectiveness of the cutter assembly 24, particles of superhard material 26. such as small natural diamonds, may be embedded in the matrix material of the stud 17 to the rear of the cutting element. For this purpose the mould cavity 22 of Figure 5 is provided with an additional depression (indicated in dotted line at 21) rearwardly of the cutting element 8. This depression is filled with a mixture of superhard and matrix-forming particles, before the rest of the cavity 22 is filled with matrix-forming particles, so that the superhard particles become embedded in the matrix during formation of the stud 17. Such particles of superhard material may also be employed in cutter assemblies according to the invention which are used as primary cutters.
Figures 7 to 9 show an alternative form of cutter assembly manufactured according to the present invention. In this case the carrier which is moulded from matrix material, by a process similar to that described in relation to Figures 4 and 5, is in the form of a cylindrical stud 27 of circular cross-section. The cutting element 28 comprises a front cutting table 29 of polycrystalline diamond bonded to a substrate 30, for example of cemented tungsten carbide. In the arrangement shown the centre of the cutting element 28 lies on the central axis 31 of the stud and the cutting element is inclined at 450 to that axis.
In the above described arrangements the stud or post in which the cutting element is embedded is received within a socket in the bit body and is secured in the socket, for example by brazing or by shrink fitting.
Claims (19)
1. A method of forming a cutter assembly for a rotary drill bit comprising locating in a mould a pref orm polycrystalline diamond cutting element of a kind which is non-thermally stable, as hereinbefore defined, packing powdered matrix- forming material around at least part of the cutting element within the mould, and infiltrating the material with a metal alloy in a furnace to form a body of solid infiltrated matrix in which the cutting element is at least partly embedded, the metal alloy being selected to provide an infiltration temperature which is not greater than the temperature at which significant thermal degradation of the cutting element would occur.
2. A method according to Claim 1, wherein the 15 infiltration temperature is not greater than 850C.
3. A method according to Claim 1, wherein the infiltration temperature is not greater than 750C.
4. A method according to any of Claims 1 to 3, wherein the cutting element is a two-layer or multi- layer element including a front cutting table of polycrystalline diamond bonded to a substrate of less hard material.
5. A method according to any of Claims 1 to 4, wherein the cutting element is in the form of a tablet of substantially constant thickness.
6. A method according to Claim 5, wherein the tablet is circular or partcircular.
7. A method according to any of Claims 1 to 6, wherein the mould is so shaped that the body of matrix material is in the form of a generally cylindrical stud, the cutting element having an edge portion projecting from one end of the stud and providing the cutting edge of the 5 finished assembly.
8. A method according to Claim 7, wherein the stud is of circular crosssection.
9. A method according to any of Claims 1 to 8, wherein the cutting element is in the form of a flat tablet and is inclined at an angle to the longitudinal axis of the stud.
10. A method according to Claim 9, wherein the cutting element is inclined at an angle of about 450 to the longitudinal axis of the stud.
11. A method according to Claim 9 or Claim 10, wherein the central axis of the cutting element is coincident with the longitudinal axis of the stud.
12. A method according to any of Claims 1 to 11, wherein superhard particles are located in the mould, adjacent the cutting element, so as to become embedded in the matrix material of the finished body of the cutter assembly.
13. A method according to Claim 12, wherein the superhard particles are embedded in a part of the body of matrix material which, in use of the cutter assembly, is disposed rearwardly of the cutting element with respect to the normal direction of forward movement of the cutter assembly.
-is-
14. A method according to Claim 13, wherein said superhard particles are natural diamond particles.
15. A cutter assembly for a rotary drill bit, when manufactured by a method according to any of the preceding 5 claims.
16. A drill bit of the kind comprising a bit body having a shank for connection to a drill string, a plurality of cutter assemblies mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body for cooling and cleaning the cutter assemblies, wherein at least certain of the cutter assemblies mounted on the bit body are formed by a method according to any of Claims 1 to 14.
17. A drill bit according to Claim 16, wherein one or more of said cutter assemblies comprise secondary backup cutter assemblies associated with and placed rearwardly of respective primary cutter assemblies on the bit body.
18. A method of forming a cutter assembly for a 20 rotary drill bit and substantially as hereinbefore described with reference to the accompanying drawings.
19. A cutter assembly for a rotary drill bit substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9301146A GB2274474B (en) | 1993-01-21 | 1993-01-21 | Improvements in or relating to cutter assemblies for rotary drill bits |
| US08/183,048 US5487436A (en) | 1993-01-21 | 1994-01-18 | Cutter assemblies for rotary drill bits |
| EP94300366A EP0608112A1 (en) | 1993-01-21 | 1994-01-19 | Cutter assemblies for rotary drill bits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9301146A GB2274474B (en) | 1993-01-21 | 1993-01-21 | Improvements in or relating to cutter assemblies for rotary drill bits |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9301146D0 GB9301146D0 (en) | 1993-03-10 |
| GB2274474A true GB2274474A (en) | 1994-07-27 |
| GB2274474B GB2274474B (en) | 1996-07-31 |
Family
ID=10729070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9301146A Expired - Fee Related GB2274474B (en) | 1993-01-21 | 1993-01-21 | Improvements in or relating to cutter assemblies for rotary drill bits |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5487436A (en) |
| EP (1) | EP0608112A1 (en) |
| GB (1) | GB2274474B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6063502A (en) * | 1996-08-01 | 2000-05-16 | Smith International, Inc. | Composite construction with oriented microstructure |
| US6408958B1 (en) * | 2000-10-23 | 2002-06-25 | Baker Hughes Incorporated | Superabrasive cutting assemblies including cutters of varying orientations and drill bits so equipped |
| US20050133276A1 (en) * | 2003-12-17 | 2005-06-23 | Azar Michael G. | Bits and cutting structures |
| US7757793B2 (en) * | 2005-11-01 | 2010-07-20 | Smith International, Inc. | Thermally stable polycrystalline ultra-hard constructions |
| US7594554B2 (en) * | 2006-02-23 | 2009-09-29 | Baker Hughes Incorporated | Cutting element insert for backup cutters in rotary drill bits, rotary drill bits so equipped, and methods of manufacture therefor |
| US7909121B2 (en) * | 2008-01-09 | 2011-03-22 | Smith International, Inc. | Polycrystalline ultra-hard compact constructions |
| US9217296B2 (en) | 2008-01-09 | 2015-12-22 | Smith International, Inc. | Polycrystalline ultra-hard constructions with multiple support members |
| US20100051352A1 (en) * | 2008-08-27 | 2010-03-04 | Baker Hughes Incorporated | Cutter Pocket Inserts |
| WO2010088504A1 (en) * | 2009-01-29 | 2010-08-05 | Smith International, Inc. | Brazing methods for pdc cutters |
| US8505634B2 (en) * | 2009-12-28 | 2013-08-13 | Baker Hughes Incorporated | Earth-boring tools having differing cutting elements on a blade and related methods |
| WO2011097575A2 (en) * | 2010-02-05 | 2011-08-11 | Baker Hughes Incorporated | Shaped cutting elements on drill bits and other earth-boring tools, and methods of forming same |
| US8851207B2 (en) | 2011-05-05 | 2014-10-07 | Baker Hughes Incorporated | Earth-boring tools and methods of forming such earth-boring tools |
| SA111320671B1 (en) | 2010-08-06 | 2015-01-22 | بيكر هوغيس انكور | Shaped cutting elements for earth boring tools, earth boring tools including such cutting elements, and related methods |
| SG11201404731YA (en) | 2012-02-08 | 2014-09-26 | Baker Hughes Inc | Shaped cutting elements for earth-boring tools and earth-boring tools including such cutting elements |
| CA2884374C (en) | 2012-09-11 | 2019-09-17 | Halliburton Energy Services, Inc. | Cutter for use in well tools |
| WO2015030791A1 (en) * | 2013-08-30 | 2015-03-05 | Halliburton Energy Services, Inc. | Improved cutters for drill bits |
| WO2017106374A1 (en) | 2015-12-14 | 2017-06-22 | Smith International, Inc. | Mechanical locking of ovoid cutting element with carbide matrix |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4669522A (en) * | 1985-04-02 | 1987-06-02 | Nl Petroleum Products Limited | Manufacture of rotary drill bits |
| US5000273A (en) * | 1990-01-05 | 1991-03-19 | Norton Company | Low melting point copper-manganese-zinc alloy for infiltration binder in matrix body rock drill bits |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0090657B1 (en) * | 1982-03-31 | 1987-01-07 | De Beers Industrial Diamond Division (Proprietary) Limited | A method of making abrasive bodies |
| US4780274A (en) * | 1983-12-03 | 1988-10-25 | Reed Tool Company, Ltd. | Manufacture of rotary drill bits |
| DE3479143D1 (en) * | 1983-12-03 | 1989-08-31 | Reed Tool Co | Improvements in or relating to the manufacture of rotary drill bits |
| US4525178A (en) * | 1984-04-16 | 1985-06-25 | Megadiamond Industries, Inc. | Composite polycrystalline diamond |
| US4608226A (en) * | 1984-06-22 | 1986-08-26 | Norton Christensen, Inc. | Method of forming a diamond tooth insert for a drill bit and a diamond cutting element formed thereby |
| GB8418481D0 (en) * | 1984-07-19 | 1984-08-22 | Nl Petroleum Prod | Rotary drill bits |
| GB8505244D0 (en) * | 1985-02-28 | 1985-04-03 | Nl Petroleum Prod | Rotary drill bits |
| US4694918A (en) * | 1985-04-29 | 1987-09-22 | Smith International, Inc. | Rock bit with diamond tip inserts |
| EP0219959B1 (en) * | 1985-10-18 | 1992-04-29 | Smith International, Inc. | Rock bit with wear resistant inserts |
| US4784023A (en) * | 1985-12-05 | 1988-11-15 | Diamant Boart-Stratabit (Usa) Inc. | Cutting element having composite formed of cemented carbide substrate and diamond layer and method of making same |
| FR2598644B1 (en) * | 1986-05-16 | 1989-08-25 | Combustible Nucleaire | THERMOSTABLE DIAMOND ABRASIVE PRODUCT AND PROCESS FOR PRODUCING SUCH A PRODUCT |
| US4705124A (en) * | 1986-08-22 | 1987-11-10 | Minnesota Mining And Manufacturing Company | Cutting element with wear resistant crown |
| GB8711255D0 (en) * | 1987-05-13 | 1987-06-17 | Nl Petroleum Prod | Rotary drill bits |
| IE61697B1 (en) * | 1987-12-22 | 1994-11-16 | De Beers Ind Diamond | Abrasive product |
| US4811801A (en) * | 1988-03-16 | 1989-03-14 | Smith International, Inc. | Rock bits and inserts therefor |
| US5011515B1 (en) * | 1989-08-07 | 1999-07-06 | Robert H Frushour | Composite polycrystalline diamond compact with improved impact resistance |
| SE9002135D0 (en) * | 1990-06-15 | 1990-06-15 | Sandvik Ab | IMPROVED TOOLS FOR PERCUSSIVE AND ROTARY CRUSCHING ROCK DRILLING PROVIDED WITH A DIAMOND LAYER |
| SE9002137D0 (en) * | 1990-06-15 | 1990-06-15 | Diamant Boart Stratabit Sa | IMPROVED TOOLS FOR CUTTING ROCK DRILLING |
| US5120327A (en) * | 1991-03-05 | 1992-06-09 | Diamant-Boart Stratabit (Usa) Inc. | Cutting composite formed of cemented carbide substrate and diamond layer |
-
1993
- 1993-01-21 GB GB9301146A patent/GB2274474B/en not_active Expired - Fee Related
-
1994
- 1994-01-18 US US08/183,048 patent/US5487436A/en not_active Expired - Fee Related
- 1994-01-19 EP EP94300366A patent/EP0608112A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4669522A (en) * | 1985-04-02 | 1987-06-02 | Nl Petroleum Products Limited | Manufacture of rotary drill bits |
| US5000273A (en) * | 1990-01-05 | 1991-03-19 | Norton Company | Low melting point copper-manganese-zinc alloy for infiltration binder in matrix body rock drill bits |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9301146D0 (en) | 1993-03-10 |
| US5487436A (en) | 1996-01-30 |
| GB2274474B (en) | 1996-07-31 |
| EP0608112A1 (en) | 1994-07-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970121 |