GB2240797A - Improvements in cutting elements for rotary drill bits - Google Patents
Improvements in cutting elements for rotary drill bits Download PDFInfo
- Publication number
- GB2240797A GB2240797A GB9002963A GB9002963A GB2240797A GB 2240797 A GB2240797 A GB 2240797A GB 9002963 A GB9002963 A GB 9002963A GB 9002963 A GB9002963 A GB 9002963A GB 2240797 A GB2240797 A GB 2240797A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutting
- substrate
- peripheral surface
- cutting element
- cutting table
- 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
- 230000002093 peripheral effect Effects 0.000 claims abstract description 69
- 239000000758 substrate Substances 0.000 claims abstract description 68
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 21
- 238000005755 formation reaction Methods 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 abstract description 5
- 229910003460 diamond Inorganic materials 0.000 abstract description 4
- 239000010432 diamond Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 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
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
Landscapes
- 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)
- Earth Drilling (AREA)
- Drilling Tools (AREA)
Abstract
A preform cutting element for a rotary drill bit comprises a polycrystalline diamond cutting table 10 bonded to a coextensive substrate 11 of cemented tungsten carbide. The portion of the peripheral surface 15 of the substrate rearwardly of the cutting edge 16 of the diamond table is relieved, as viewed in axial section in a plane passing through the cutting edge. To achieve such relief the surface 15 of the substrate may be inclined towards the axis of the cutting element as it extends rearwardly away from the cutting table, or it may be cut away by a constant amount to the rear of the cutting table. In either case the relieved portion of the surface of the substrate rearwardly of the cutting edge, regardless of the angle of inclination of the cutting table itself, is spaced further from the surface 21 of the formation being drilled than it would be if it were not so relieved, and this tends to retard the formation of a wear flat on the substrate. <IMAGE>
Description
"Improvements in cutting elements for rotary drill bits"
The invention relates to rotary drill bits for use in drilling or coring holes in subsurface formations and, in particular, to preform cutting elements for use on such bits.
Rotary drill bits of the kind to which the invention relates comprise a bit body having a shank, inner passages for supplying drilling fluid to the face of the bit, and a plurality of preform cutting elements mounted on the face of the bit. Each cutting element comprises a cutting table of superhard material, such as polycrystalline diamond, having a front cutting face, a rear face, a peripheral surface, and a cutting edge provided by at least part of the junction between the front cutting face and the peripheral surface. The rear face of the cutting table is bonded to a substrate of material, such as cemented tungsten carbide, which is less hard than the superhard material.
The cutting element may be directly mounted on the bit body or may be mounted on a carrier which is received in a socket in the bit body. The bit body may be machined from steel or may comprise an infiltrated matrix material formed by a powder metallurgy process.
The construction of the bit body and the method of mounting the cutting elements thereon do not form part of the present invention and will not therefore be described in detail.
The two-part arrangement of the cutting elements provides a degree of self-sharpening since, in use, the less hard material of the substrate wears away more easily than the harder cutting table. However, although this self-sharpening effect is advantageous, a wear flat forms on the cutting element. The wear flat increases in area with continuing use, thus resulting in increasing frictional resistance to the rotation of the drill bit and increased heating effect, which may lead to failure of the cutting element through thermal degradation or to failure of the bond between the cutting element and the carrier or bit body,
Most of the useful life of a preform cutting element comes before the element is 10% worn. After the development of any significant wear flat, wear increases exponentially.It is therefore desirable to minimise as far as possible the early development of a wear flat on the cutting element, and the present invention sets out to provide a configuration of cutting element where this may be achieved.
According to the invention there is provided a preform cutting element comprising a cutting table of superhard material having a front cutting face, a rear face, a peripheral surface, and a cutting edge provided by at least part of the junction between the front cutting face and the peripheral surface, the rear face of the cutting table being bonded to a substrate of material which is less hard than the superhard material, the substrate being substantially coextensive with the cutting table and having a peripheral surface which, as viewed in axial section in a plane passing through a location on the cutting edge, is spaced, over at least a major part of its axial dimension, from a datum line extending at right angles to the rear surface of the cutting table and passing through the junction between said rear surface and the peripheral surface of the cutting table adjacent said location on the cutting edge.
When a cutting element of this configuration is in use, the portion of the peripheral surface of the substrate rearwardly of the cutting edge is, at least in part, spaced further from the surface of the formation being drilled than is the case with a normal prior art preform cutting element, with the result that the formation of the wear flat may be retarded.
The invention also includes within its scope a rotary drill bit for use in drilling or coring holes in subsurface formations, comprising a bit body having a shank, inner passages for supplying drilling fluid to the face of the bit, and a plurality of preform cutting elements mounted on the face of the bit, each cutting element comprising a cutting table of superhard material having a front cutting face, a rear face, a peripheral surface, and a cutting edge provided by at least part of the junction between the front cutting face and the peripheral surface, the cutting element being orientated on the bit body so that its front cutting face is inclined forwardly, with respect to the surface of the formation being drilled, in the direction of normal forward movement of the cutting element in use, the rear face of the cutting table being bonded to a substrate of material which is less hard than the superhard material, the substrate having a peripheral surface which, as viewed in axial section in a plane passing through a location on the cutting edge, is spaced, over at least a major part of its axial dimension, from a datum line extending at right angles to the rear surface of the cutting table and passing through the junction between said rear surface and the peripheral surface of the cutting table adjacent said location on the cutting edge.
The peripheral surface of the substrate, as viewed in said axial section, may be inclined away from said datum line, whereby the surface is increasingly spaced from the datum line as it extends away from the rear surface of the cutting table. For example, the peripheral surface of the substrate may be inclined at an angle substantially in the range of 5-1Oe to said datum line.
The peripheral surface of the cutting table may extend substantially at right angles to the rear surface thereof, and thereby lie on said datum line.
Preferably the peripheral surface of the cutting table forms a substantially smooth continuation of the peripheral surface of the substrate.
The peripheral surface of the substrate may meet the rear surface of the cutting table at the junction between said rear surface and the peripheral surface of the cutting table.
Alternatively, the peripheral surface of the substrate may meet the rear surface of the cutting table at a location spaced from the junction between said rear surface and the peripheral surface of the cutting table.
In this case the peripheral surface of the substrate may extend substantially parallel to said datum line.
In any of the above arrangements the cutting element may be in the form of a body of revolution, whereby all axial sections thereof are substantially similar. For example, the substrate may be substantially frusto conical. In this case the cutting table may also be substantially frusto conical, forming a substantially smooth continuation of the frusto conical substrate. Alternatively the cutting table may be substantially cylindrical, the rear surface of the cutting table being of substantially the same diameter as the larger, front surface of the substrate.
Although the cutting element may be mounted directly on the bit body, it will often be mounted on a carrier which is then, in turn, mounted on the bit body.
For example the carrier may be in the form of a generally cylindrical stud, the cutting element being bonded to a surface on the stud which is inclined at an angle of less than 90' to the longitudinal axis of the stud, at one end thereof.
Such carriers are often formed of cemented tungsten carbide but other materials may be used, such as composite materials including tungsten metal.
The following is a more detailed description of embodiments of the invention, by way of example, reference being made to the accompanying drawings in which:
Figure 1 is a side elevation of a typical example of a drill bit to which the invention is applicable,
Figure 2 is an end elevation of the drill bit shown in Figure 1,
Figure 3 is a diagrammatic axial section through a prior art preform cutting element,
Figure 4 is a similar view to Figure 3, but showing the attitude of the prior art cutting element, relative to the formation being drilled, in use,
Figure 5 is a diagrammatic axial section through one form of cutting element in accordance with the present invention,
Figure 6 shows the cutting element of Figure 5 in use,
Figures 7-10 and 12 are diagrammatic axial sections through further forms of preform cutting element in accordance with the invention, and
Figure 11 shows a cutting structure incorporating the cutting element of Figure 10.
Figures 1 and 2 show a full bore drill bit of the general kind to which the present invention is applicable.
The bit body 1 is typically formed of carbide matrix infiltrated with a binder alloy, and has a threaded shank 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 cutting structures 5 spaced apart along the length thereof.
The bit gauge section 6 includes kickers 7 which contact the walls of the bore hole to stabilise the bit in the bore hole. A central passage (not shown) in the bit body and shank delivers drilling fluid through nozzles 8 in the end face 3 in known manner.
It will be appreciated that this is only one example of the many possible variations of the type of bit to which the invention is applicable, including bits where the body is machined from steel.
Referring to Figure 3, there is shown in axial section a prior art two-layer preform cutting element.
The element is in the form of a circular tablet and comprises a front cutting table 10 of superhard material bonded to a thicker substrate 11 of less hard material.
The superhard material usually comprises polycrystalline diamond, although other superhard materials, such as cubic boron nitride are possible. The substrate is often formed of cemented tungsten carbide. As is well known, the components of the cutting element are normally bonded together during formation of the whole cutting element in a high pressure, high temperature press. However the present invention also includes arrangements where the cutting table is separately formed from the substrate and is subsequently bonded thereto.
The cutting element may be directly mounted on the bit body, or may be mounted on a carrier such as a stud which is received in a socket in the bit body. The method of mounting does not form part of the present invention and will not therefore be described in further detail.
The cutting table 10 has a front cutting surface 12, a rear surface 13 bonded to the substrate 11 and a peripheral surface 14. The substrate 11 also has a peripheral surface 15. The junction between the front cutting face 12 and the peripheral surface 14 of the cutting table 10 provides a cutting edge indicated at 16. The junction between the rear surface 13 of the cutting table 10 and the peripheral surface 14 is indicated at 17. These reference numerals will, for convenience, be used throughout the following description to refer to corresponding parts of the various types of cutting element to be described.
In a generally circular cutting element the cutting edge extends around the whole periphery of the element but in other shapes of cutting element, such as part-circular elements, the cutting edge may extend around only a part of the periphery.
Figure 4 shows the prior art cutting element of Figure 3 in use, and in particular shows its orientation with respect to the formation 18 being drilled.
It will be seen that the front cutting face 12 of the element is inclined forwardly in the direction of movement (indicated by the arrow). This forward inclination to the normal is referred to as the negative rake angle and is indicated at 19. The angle 20 between the peripheral surface 15 of the substrate 11 and the formation 18 is referred to as the relief angle.
It will be seen in the axial section shown in
Figures 3 and 4 that the peripheral surfaces 15, 14 of both the substrate and the cutting table extend at right angles to the front cutting face 12 of the cutting element so that the relief angle 20 is equal to the negative rake angle 19.
The rate at which a wear flat develops on such a preform cutting element depends to a certain extent on the magnitude of the relief angle. It will be apparent that the greater is the relief angle, the smaller will be the wear flat on the substrate 11, for a given depth of wear. However, in the prior art cutting element, the relief angle is entirely determined by the required negative back rake angle 19 and there is a limit to which the angle 19 may be increased. If the rake angle is small, the relief angle will be correspondingly small and a large wear flat will develop comparatively rapidly.
Figure 5 is a similar view to Figure 3 but showing a cutting element in accordance with the present invention. It will be seen that in this case, as viewed in axial section, the peripheral surface of the substrate 15 rearwardly of a location on the cutting edge 16 is relieved so as to be spaced away from a datum line 21 which extends at right angles to the rear surface 13 of the cutting table 10 and passes through the junction 17 between said rear surface and the peripheral surface 14 of the cutting table.
In the arrangement shown the peripheral surface 15 is substantially straight as viewed in axial cross-section and is inclined at an angle 22 to the datum line 21. The angle 22 may conveniently be in the range of 5-10 . While this is a convenient configuration, advantage may also be given by any other shape of substrate 11 whereby its peripheral surface, rearwardly of the location on the cutting edge 16, is spaced from the datum line 21 over at least a major part of its axial dimension.
Figure 6 is a view, similar to Figure 4, showing the orientation of the cutting element of Figure 5 in use. It will be seen that although the negative rake angle 19 is the same as in the arrangement of
Figure 4, the relief angle 20 is greater and this may reduce the rate at which the wear flat is formed on the substrate 15 as drilling proceeds.
In the arrangement of Figures 5 and 6 the relieved portion of the substrate surface 15 to the rear of the cutting edge 16 may be formed by grinding or otherwise forming an inclined flat on a conventional cylindrical substrate 11. It will be appreciated that this reduces the area of the rear surface 23 of the substrate, and this may reduce the strength of the bond between the cutting element and the bit body or carrier on which it is mounted. Figures 7 and 8 show arrangements where this possible disadvantage is overcome.
In the arrangement of Figure 7 the spacing of part of the peripheral surface 15 from the datum line 21 is achieved by the substrate being formed with its circular rear surface 23 displaced away from the aforesaid datum line 21 with respect to its front surface. This provides the required spacing of the lower portion of the peripheral surface 15 from the datum line 21, but maintains the area of the rear surface 23 of the substrate.
In the arrangements so far described, the peripheral surface 14 of the cutting table is at right angles to the rear surface 13 thereof so that the peripheral surface 14 lies on the datum line 21, and there is therefore an angular discontinuity where the peripheral surface 14 of the cutting table meets the peripheral surface 15 of the substrate. Figure 8 shows an alternative arrangement, where the substrate 11 is similarly shaped to the Figure 7 arrangement but where the peripheral surface 14 of the cutting table 10 is so shaped as to form a smooth continuation of the peripheral surface 15 of the substrate 11.
In the alternative construction of Figure 9 the cutting element is in the form of a body of revolution, i.e. is frusto-conical. This provides the required spacing of the peripheral surface 15 from the formation 18 as well as providing a smooth continuation between the peripheral surface 15 of the substrate and the peripheral surface 14 of the cutting table 10.
In the alternative construction shown in
Figure 10 only the substrate 11 is frusto conical, the cutting table 10 being cylindrical in conventional manner.
Figure 11 shows a cutting element of the kind shown in Figure 10 mounted on a stud 24 which is received in a socket in the bit body 25. The stud, which may be formed from cemented tungsten carbide, is generally cylindrical and the rear surface of the substrate 11 of the cutting element is bonded, for example by brazing, to an end surface 26 of the stud which is inclined at angle of less than 90- to the central longitudinal axis of the stud. The stud 24 is so orientated, and the surface 26 is so orientated with respect to the stud, that the cutting element has negative back rake, that is to say its front cutting surface 12 is inclined forwardly, with respect to the surface 18 of the formation being drilled, in the direction of normal forward movement of the cutting element in use, as indicated by the arrow in Figure 11.
It will be seen from Figure 11 that the cutting element is so mounted on the surface 26 that the surface 27 of the stud 24 to the rear of the cutting edge forms a continuation of the corresponding part of the peripheral surface 15 of the substrate 11. This ensures that full advantage is given by the improved relief angle provided by the shape of the peripheral surface of the substrate of the cutting element.
However, in an alternative arrangement, shown dotted in Figure 11, the cutting element may be set slightly above the surface 27a of the stud to the rear of the cutting edge.
As in all of the arrangements described above, the substrate 11 is substantially coextensive with the cutting table 10.
As previously mentioned, it is not essential that the relieving of the surface of the substrate be provided by inclining it at an angle to the datum line, and Figure 12 shows an alternative construction. In this case the peripheral surface 15 of the substrate 11 meets the rear surface 13 of the cutting table 10 at a location spaced from the junction 17 between the rear surface 13 and the peripheral surface 14 of the cutting layer. The peripheral surface of the cutting layer is then generally parallel to the datum line 21.
In this arrangement a wear flat does not begin to form on the substrate 11 until the projecting portion of the cutting table 10 has worn away.
It will be appreciated that many other configurations are possible within the scope of the present invention. For example, only a part of the axial length of the peripheral surface of the substrate may be spaced from the datum line 21 rearwardly of the cutting edge 16.
In such an arrangement the first part of the axial length of the peripheral surface of the substrate, as it extends away from the rear of the cutting table, may extend at right angles to the rear surface of the cutting table, i.e. along the datum line 21, for a short distance, only subsequently becoming spaced from the datum line. This initial part of the peripheral surface of the substrate might even be inclined at an angle greater than 90" to the rear surface of the cutting table so that for a short distance it extends below the datum line 21 and only returns to a position spaced above the datum line as it extends further rearwardly from the cutting table.
Although the invention has been described with reference to two-part cutting elements, it may also be applicable to multi-part elements where the cutting table and/or the substrate comprises a number of layers, or where one or more intermediate layers are disposed between the cutting table and substrate.
Claims (19)
1. A preform cutting element comprising a cutting table of superhard material having a front cutting face, a rear face, a peripheral surface, and a cutting edge provided by at least part of the junction between the front cutting face and the peripheral surface, the rear face of the cutting table being bonded to a substrate of material which is less hard than the superhard material, the substrate being substantially coextensive with the cutting table and having a peripheral surface which, as viewed in axial section in a plane passing through a location on the cutting edge, is spaced, over at least a major part of its axial dimension, from a datum line extending at right angles to the rear surface of the cutting table and passing through the junction between said rear surface and the peripheral surface of the cutting table adjacent said location on the cutting edge.
2. A cutting element according to Claim 1, wherein the peripheral surface of the substrate, as viewed in said axial section, is inclined away from said datum line, whereby the surface is increasingly spaced from the datum line as it extends away from the rear surface of the cutting table.
3. A cutting element according to Claim 2, wherein the peripheral surface of the substrate, as viewed in said axial section, is inclined at an angle substantially in the range of 5-10" to said datum line.
4. A cutting element according to any of Claims 1 to 3 wherein, as viewed in said axial section, the peripheral surface of the cutting table extends substantially at right angles to the rear surface thereof, and thereby lies on said datum line.
5. A cutting element according to any of Claims 1 to 3 wherein, as viewed in said axial section, the peripheral surface of the cutting table forms a substantially smooth continuation of the peripheral surface of the substrate.
6. A cutting element according to any of Claims 1 to 5 wherein, as viewed in said axial section, the peripheral surface of the substrate meets the rear surface of the cutting table at the junction between said rear surface and the peripheral surface of the cutting table.
7. A cutting element according to any of Claims 1 to 5 wherein, as viewed in said axial section, the peripheral surface of the substrate meets the rear surface of the cutting table at a location spaced from the junction between said rear surface and the peripheral surface of the cutting table.
8. A cutting element according to Claim 7 whereby, as viewed in said axial section, the peripheral surface of the substrate extends substantially parallel to said datum line.
9. A cutting element according to any of Claims 1 to 8, wherein the cutting element is in the form of a body of revolution, whereby all axial sections thereof are substantially similar.
10. A cutting element according to Claim 9 wherein the substrate is substantially frusto conical.
11. A cutting element according to Claim 10 wherein the cutting table is substantially frusto conical and forms a substantially smooth continuation of the frusto conical substrate.
12. A cutting element according to Claim 10 wherein the cutting table is substantially cylindrical, the rear surface of the cutting table being of substantially the same diameter as the larger, front surface of the substrate.
13. A cutting structure comprising a cutting element according to any of the preceding claims mounted on a carrier.
14. A cutting structure according to Claim 13, wherein the carrier in the form of a generally cylindrical stud.
15. A cutting structure according to Claim 14, wherein the substrate of the cutting element is bonded to a surface on the stud which is inclined at an angle of less than 90" to the longitudinal axis of the stud, at one end thereof.
16. A rotary drill bit for use in drilling or coring holes in subsurface formations, comprising a bit body having a shank, inner passages for supplying drilling fluid to the face of the bit, and a plurality of preform cutting elements mounted on the face of the bit, each cutting element comprising a cutting table of superhard material having a front cutting face, a rear face, a peripheral surface, and a cutting edge provided by at least part of the junction between the front cutting face and the peripheral surface, the cutting element being orientated on the bit body so that its front cutting face is inclined forwardly, with respect to the surface of the formation being drilled, in the direction of normal forward movement of the cutting element in use, the rear face of the cutting table being bonded to a substrate of material which is less hard than the superhard material, the substrate having a peripheral surface which, as viewed in axial section in a plane passing through a location on the cutting edge, is spaced, over at least a major part of its axial dimension, from a datum line extending at right angles to the rear surface of the cutting table and passing through the junction between said rear surface and the peripheral surface of the cutting table adjacent said location on the cutting edge.
17. A preform cutting element substantially as hereinbefore described with reference to any of Figures 5-11 of the accompanying drawings.
18. A cutting structure comprising a cutting element mounted on a carrier and according to Figure 11 of the accompanying drawings.
19. A rotary drill bit substantially as hereinbefore described with reference to Figures 1 and 2 and any of Figures 5-11 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9002963A GB2240797B (en) | 1990-02-09 | 1990-02-09 | Improvements in cutting elements for rotary drill bits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9002963A GB2240797B (en) | 1990-02-09 | 1990-02-09 | Improvements in cutting elements for rotary drill bits |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9002963D0 GB9002963D0 (en) | 1990-04-04 |
| GB2240797A true GB2240797A (en) | 1991-08-14 |
| GB2240797B GB2240797B (en) | 1994-03-09 |
Family
ID=10670726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9002963A Expired - Fee Related GB2240797B (en) | 1990-02-09 | 1990-02-09 | Improvements in cutting elements for rotary drill bits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2240797B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5460233A (en) * | 1993-03-30 | 1995-10-24 | Baker Hughes Incorporated | Diamond cutting structure for drilling hard subterranean formations |
| US5706906A (en) * | 1996-02-15 | 1998-01-13 | Baker Hughes Incorporated | Superabrasive cutting element with enhanced durability and increased wear life, and apparatus so equipped |
| US5871060A (en) * | 1997-02-20 | 1999-02-16 | Jensen; Kenneth M. | Attachment geometry for non-planar drill inserts |
| US5924501A (en) * | 1996-02-15 | 1999-07-20 | Baker Hughes Incorporated | Predominantly diamond cutting structures for earth boring |
| US5979579A (en) * | 1997-07-11 | 1999-11-09 | U.S. Synthetic Corporation | Polycrystalline diamond cutter with enhanced durability |
| US6068071A (en) * | 1996-05-23 | 2000-05-30 | U.S. Synthetic Corporation | Cutter with polycrystalline diamond layer and conic section profile |
| US6098730A (en) * | 1996-04-17 | 2000-08-08 | Baker Hughes Incorporated | Earth-boring bit with super-hard cutting elements |
| CN103492661A (en) * | 2011-04-26 | 2014-01-01 | 史密斯国际有限公司 | Polycrystalline diamond compact cutters with conic shaped end |
| US9187962B2 (en) | 2011-04-26 | 2015-11-17 | Smith International, Inc. | Methods of attaching rolling cutters in fixed cutter bits using sleeve, compression spring, and/or pin(s)/ball(s) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117514016A (en) * | 2024-01-03 | 2024-02-06 | 西南石油大学 | PDC drill bit with reversely-mounted teeth |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0155026A2 (en) * | 1984-02-29 | 1985-09-18 | Shell Internationale Researchmaatschappij B.V. | Rotary drill bit with cutting elements having a thin abrasive front layer |
| GB2161849A (en) * | 1984-07-19 | 1986-01-22 | Nl Petroleum Prod | Improvements in or relating to rotary drill bits |
| GB2188354A (en) * | 1986-03-27 | 1987-09-30 | Shell Int Research | Rotary drill bit |
-
1990
- 1990-02-09 GB GB9002963A patent/GB2240797B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0155026A2 (en) * | 1984-02-29 | 1985-09-18 | Shell Internationale Researchmaatschappij B.V. | Rotary drill bit with cutting elements having a thin abrasive front layer |
| GB2161849A (en) * | 1984-07-19 | 1986-01-22 | Nl Petroleum Prod | Improvements in or relating to rotary drill bits |
| GB2188354A (en) * | 1986-03-27 | 1987-09-30 | Shell Int Research | Rotary drill bit |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5460233A (en) * | 1993-03-30 | 1995-10-24 | Baker Hughes Incorporated | Diamond cutting structure for drilling hard subterranean formations |
| US5706906A (en) * | 1996-02-15 | 1998-01-13 | Baker Hughes Incorporated | Superabrasive cutting element with enhanced durability and increased wear life, and apparatus so equipped |
| US5924501A (en) * | 1996-02-15 | 1999-07-20 | Baker Hughes Incorporated | Predominantly diamond cutting structures for earth boring |
| US6000483A (en) * | 1996-02-15 | 1999-12-14 | Baker Hughes Incorporated | Superabrasive cutting element with enhanced durability and increased wear life, and apparatus so equipped |
| US6082223A (en) * | 1996-02-15 | 2000-07-04 | Baker Hughes Incorporated | Predominantly diamond cutting structures for earth boring |
| US6098730A (en) * | 1996-04-17 | 2000-08-08 | Baker Hughes Incorporated | Earth-boring bit with super-hard cutting elements |
| US6068071A (en) * | 1996-05-23 | 2000-05-30 | U.S. Synthetic Corporation | Cutter with polycrystalline diamond layer and conic section profile |
| US5871060A (en) * | 1997-02-20 | 1999-02-16 | Jensen; Kenneth M. | Attachment geometry for non-planar drill inserts |
| US5979579A (en) * | 1997-07-11 | 1999-11-09 | U.S. Synthetic Corporation | Polycrystalline diamond cutter with enhanced durability |
| CN103492661A (en) * | 2011-04-26 | 2014-01-01 | 史密斯国际有限公司 | Polycrystalline diamond compact cutters with conic shaped end |
| US9187962B2 (en) | 2011-04-26 | 2015-11-17 | Smith International, Inc. | Methods of attaching rolling cutters in fixed cutter bits using sleeve, compression spring, and/or pin(s)/ball(s) |
| US9739097B2 (en) | 2011-04-26 | 2017-08-22 | Smith International, Inc. | Polycrystalline diamond compact cutters with conic shaped end |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9002963D0 (en) | 1990-04-04 |
| GB2240797B (en) | 1994-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960209 |