GB2081347A - Drill tool for deep wells - Google Patents
Drill tool for deep wells Download PDFInfo
- Publication number
- GB2081347A GB2081347A GB8123930A GB8123930A GB2081347A GB 2081347 A GB2081347 A GB 2081347A GB 8123930 A GB8123930 A GB 8123930A GB 8123930 A GB8123930 A GB 8123930A GB 2081347 A GB2081347 A GB 2081347A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotary drill
- drill tool
- cutting
- bonding substance
- matrix bonding
- 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
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000005520 cutting process Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims description 35
- 239000000126 substance Substances 0.000 claims description 24
- 239000010432 diamond Substances 0.000 claims description 12
- 238000005299 abrasion Methods 0.000 claims description 10
- 229910003460 diamond Inorganic materials 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 230000003628 erosive effect Effects 0.000 claims description 4
- 238000010285 flame spraying Methods 0.000 claims description 4
- 238000007750 plasma spraying Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000005552 hardfacing Methods 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229940126214 compound 3 Drugs 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000004429 Calibre Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102000004726 Connectin Human genes 0.000 description 1
- 108010002947 Connectin Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 238000012800 visualization Methods 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
-
- 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
- B22F7/08—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 with one or more parts not made from powder
-
- 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
-
- 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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Earth Drilling (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Drilling Tools (AREA)
Abstract
A rotary bit for oil and gas well drilling has cutting elements (1) set in a hard facing material (3) which in turn is supported by a sintered steel section (4) between the hard facing and the steel base (7) of the bit. <IMAGE>
Description
SPECIFICATION
Drill tool for deep wells
This invention is concerned with a rotary drill tool for deep wells consisting of a threaded stud for connectin with a drill string or with a steel connecting body including a similar rotary drive, and a head provided with cutting members which extend from the base region of the head into a retracted central region, the cutting members being arranged in projecting rows or strip-like groups over the exterior surface of the tool and being supported in a bonding substance.
In known rotary drill tools of this type, the cutting members of natural or synthetic diamond or polycrystalline diamond are supported in a matrix bonding substance which is mounted on the steel connecting body. Usually tungsten carbide alloyed with copper is used as the bond in the matrix bonding substance. This material possesses a high erosion and abrasion resistance but is very expensive due to its cemented carbide content.
In spite of this, a great layer thickness is required to absorb the thermal stresses which arise in the manufacturing process to prevent crack formation, so that the amount of expensive and scarce matrix material required is attributable as a disadvantage of known rotary drill tools.
It is an object of the present invention to arrange the matrix bonding compound in such a way that the proportion of expensive material can be reduced without reducing the mechanical properties of the tool.
The present invention is a rotary drill tool for deep well drilling, consisting of a steel connecting body which includes a threaded stud to connect with a rotary drive, the tool head being provided with cutting members and/or cutting coatings, which extend from the base region of the head to its central region, arranged in row or strip-like protruding groups upon the external circumference and supported in a matrix bonding substance, and in which the matrix bonding substance is confined to the region of the protruding strip or row-like groups, the matrix bonding substance is formed as a layer and a space between the layer and the steel connecting body is provided with a sintered steel filler.
The web or rib-like construction of the blades which surround the matrix bonding substance has the result that thermal stresses can appear at the circumference only partially. Therefore, no addition to the share of thermal stress ensues and the dreaded layer cracks are avoided. The thickness of the matrix bonding layer itself can be reduced with the above-mentioned construction of the blades if the compound is replaced by filler in the core region.
Saving of matrix material thus occurs in twofold consideration.
Steel, for example, is a suitable filler, with which the space between the matrix bonding compound layer and the steel connecting body is filled and subsequently bonded by means of a sintering process.
A special advantage of this intermediate layer lies in the buffering effect relative to the steel connecting body which expands against the graphite mould during the heating process.
The matrix bonding compound may be applied to the surface as a uniformly thick layer in a tangential direction and orthogonal to it is it is expected that the formation of uniform abrasion will occur in the application of the rotary drill tool or also adjusted according to the degree of the abrasion and erosion forces occuring at various locations of the tool during drilling. In addition, a choice of various abrasion-resistant material may be made taking the expected wear forces into consideration.
In all the above-mentioned design forms, preformed wear-resistant supporting bodies may be inserted into the matrix bonding compound or into the filler, onto which diamond layer cutting elements (e.g., sintered polycrystalline diamond) may be soldered after the manufacturing process of the tool body.
Similarly, man-made or natural diamonds may be set into the surface of the matrix layer or small calibre diamonds may be impregnated directly into the matrix bonding compound. Beyond this, combinations of the above-mentioned cutting materials are possible.
The nozzles or gutters, with passage channels to a central hole which are usuai for removal of drill cuttings and cooling the cutting, may be inserted into the matrix material or shaped out of the matrix substance and, if desired, out of the filler.
In a special design form of the nozzles, the passage channels are directed out to the surface of the tool with a constant cross-section, and, preferentially, have a relationship of diameter to length in the region between 0.5 and 0.1.
If, in the case of certain blade proportions, the surface area of the steel connecting body usable for bonding must be enlarged, ridges can be welded onto the connecting body in the region of the blades or studs may be recessed as projections during machining of the steel body.
Ridges or ribs are required when the relationship of blade width to blade height is unity or less than unity. Wear protection of the base material between the ribs, which becomes necessary due to the tool geometry or drilling conditions may be achieved by jacketting the base material with an anti-wear lining of suitable materials by welding, flame or plasma spraying onto the steel connecting body.
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a graphic representation of a first rotary drill tool with blades which are formed as studs and which carry preformed cutting layers fastened to supports. The flushing fluid is conducted through nozzles;
Figure 2 shows a second rotary drill tool, whose blades are formed as those in Figure 1, but in which the flushing liquid is conducted by way of gutters;
Figure 3 shows a third rotary drill tool with flat studs, whose tangential surface contains cutting particles and form a cutting layer and which are perforated by waterways according to a defined configuration; Figures4and 5show cross-sections through various construction designs of a rotary drill tool according to Figure 1.
Figures 6, 7 and 8 show cross-sections through various construction designs of a rotary drill tool according to Figure 2; and
Figures 9 and t0 show cross-sections through various construction designs of a rotary drill tool according to Figure 3.
In Figure 1, a rotary drill tool is represented which includes a steel connecting body 7 and three stud shaped blades which extend from the outer radius of the tool to the centre. The blades have preformed cutter tips with polycrystalline sintered diamond which are fastened to the supports which are partially inserted into the stud and the whole designated as 1.
Inside the steel connecting body 7, a central drilled hole and passage channels for the flush are provided to supply the tool with flushing liquid. These flow into nozzles 5.
The blades are exposed to strong abrasive forces during drilling and have an abrasion and erosionresistance surface made of matrix bonding substance 3. The remainder of the steel body is unprotected or provided with an anti-wear lining 6 by welding, flame or plasma spraying a suitable material onto the connecting body.
For visualization of the buildup of a stud, crosssections through a stud according to the design of
Figure 1 are represented in Figures 4 and 5. A stud with a blade part, the whole designated as 1, is arranged on a steel connecting body 7. The stud consists of an outer layer of matrix bonding compound 3, which, as described above, is very abrasion and erosion-resistant through the addition of a wear-resistant material, e.g., a carbide. On the other hand, an inner core 4 is composed of steel which is bonded by means of sintering processes with or withoutthe addition of binder.
In addition to main use as a mount and support for the blade members 1,the matrix bonding compound 3 of the steel core 4 serves also to protect the nozzles 5, which convey the flushing liquid. The remainder of the steel connecting body can be provided with an armoured coating 6, which as already described above, can be applied by welding, flame or plasma spraying a suitable material onto the connecting body.
The difference between the stud illustrated in
Figure 5 and the one in Figure 4 consists of its greater height. This stud has a strip 8 to enlarge the usable area for bonding to the steel connecting body 7, which, for example, was weided onto the steel connecting body 7 or was recessed as a projection during manufacture.
Examples of how a partially produced matrix bonding substance 3 with steel core 4 is also suitable for the production of other tool shapes are given in the second tool illustrated in Figure 2 as well as in the appropriate cross-sections of Figures 6, 7, 8.
While maintaining the blade members 1 described in connection with Figures 1,4 and 5, open gutters 9 are provided on the outside instead of nozzles. The gutters are inserted or shaped into the matrix bonding substance and flow into the passage channels connecting with the central hole in the interior of the tool. The outer, abrasion resistant, layer of the gutters 9 is co-drawn into the interior following the outer contour, so that approximately equal thickness of abrasion resistant material is encountered on all the surface locations of the stud including the inserted gutters. A strip 8 according to Figure 7 is provided when the height of the stud is greater, which fuifils the same purpose as that described in connection with the design in Figure 5.
Figure 8 shows a design of a stud of low height, where a recess exists in the steel connecting body 7 to receive the matrix bonding substance 3 and the steel core 12.
In a third drill tool, according to Figure 3, insteadof prefabricated, precisely positioned blade members, layers made of a cutting material with, for example, natural diamonds bonded into the matrix bonding substance are formed as the outer tangential surface of the ribs and form a cutting coating 2. This cutting coating 2 is interrupted and passed through in a kind of tyre tread profile by gutters 9, into which, as described with the second rotary drill tool (Figure 2) the channels connecting with the central hole flow.
The design represented in cross-section in Figures 9, 10, on the other hand, corresponds to the remaining design shapes which have been dealt with, with respect to the arrangement of the matrix bonding substance 3 and the steel core 4.
Claims (13)
1. Rotary drill tool for deep well drilling, consisting of a steel connecting body which includes a threaded stud to connect with a rotary drive, the tool head being provided with cutting members and/or cutting coatings, which extend from the base region of the head to its central region, arranged in row or strip-like protruding groups upon the external circumference and supported in a matrix bonding substance, and in which the matrix bonding substance is confined to the region of the protruding strip or row-like groups, the matrix bonding substance is formed as a layer and a space between the layer and the steel connecting body is provided with a sintered steel filler.
2. Rotary drill tool as claimed in claim 1, in which the thickness of the matrix bonding substance layer is adjusted according to the degree of abrasion and erosion forces which occur at various locations ofthe tool during drilling.
3. Rotary drill tool as claimed in claim 1, in which passage channels for flushing liquid connected with a central hole in the steel connecting body are provided, which flow into nozzles, the nozzles being arranged ahead of the cutting members in the rotation direction of the tool and being protected by the matrix bonding substance.
4. Rotary drill tool as claimed in claim 3, in which the nozzles are shaped and formed integrally from matrix bonding substance.
5. Rotary drill tool as claimed in claim 3, in which the nozzles are formed from the passage channels and have a constant cross-section overthe length.
6. Rotary drill tool as claimed in claim 1, in which one or more passage channels for flushing liquid are provided with a central hole into the steel connecting body, which channels flow into gutters which are open on the outside, the drains being embedded in the matrix bonding substance and in the filler, and thereby the layer shape of the matrix bonding substance follows the contour of the drains.
7. Rotary drill tool as claimed in claim 1, in which the cutting members are formed from cutting laminae with polycrystalline sintered diamond or impregnated cutting elements, which for their part are fastened to supports.
8. Rotary drill tool as claimed in claim 1, in which the cutting coatings consist of natural or synthetic or a combination of both kinds of diamond, which are impregnated into the matrix bonding substance and/or are set into its surface.
9. Rotary drill tool as claimed in claim 1, in which are provided both cutting members from cutting laminae with polycrystalline sintered diamond or impregnated cutting elements, which for their part are fastened to supports, as well as cutting members or cutting coatings of natural or synthetic or a combination of both kinds of diamond which are impregnated into the matrix bonding substance and/or set into its surface.
10. Rotary drill tool as claimed in claim 1, in which strips are produced on the connecting body or are recessed during the fabrication of the connecting body to enlarge the surface area usable for bonding between the steel connecting body and the filler.
11. Rotary drill tool as claimed in claim 1, in which an armoured lining of abrasion and erosionresistant material is provided between the protruding strip or row-like groups.
12. Rotary drill tool as claimed in claim 11, in which the armoured lining is made of a hard coating which, for example, can be formed by welding, flame or plasma spraying.
13. Rotary drill tool substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3030010A DE3030010C2 (en) | 1980-08-08 | 1980-08-08 | Rotary drill bit for deep drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2081347A true GB2081347A (en) | 1982-02-17 |
| GB2081347B GB2081347B (en) | 1984-05-10 |
Family
ID=6109153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8123930A Expired GB2081347B (en) | 1980-08-08 | 1981-08-05 | Drill tool for deep wells |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5761187A (en) |
| AU (1) | AU541630B2 (en) |
| BE (1) | BE889745A (en) |
| CA (1) | CA1161028A (en) |
| DE (1) | DE3030010C2 (en) |
| FR (1) | FR2488324B1 (en) |
| GB (1) | GB2081347B (en) |
| MX (1) | MX155881A (en) |
| NL (1) | NL8103467A (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0087283A1 (en) * | 1982-02-20 | 1983-08-31 | Unicorn Industries Plc | Rotary drilling bits |
| EP0117506A2 (en) * | 1983-02-24 | 1984-09-05 | Eastman Christensen Company | A cutting tooth and a rotating bit having a fully exposed polycrystalline diamond element |
| EP0121124A2 (en) * | 1983-03-07 | 1984-10-10 | Eastman Christensen Company | An improved diamond cutting element in a rotating bit |
| EP0121802A2 (en) * | 1983-03-14 | 1984-10-17 | Eastman Christensen Company | Tooth configuration for an earth boring bit |
| US4505342A (en) * | 1982-11-22 | 1985-03-19 | Nl Industries, Inc. | Drill bit |
| EP0140676A2 (en) * | 1983-10-29 | 1985-05-08 | Reed Tool Company Limited | Improvements in or relating to rotary drill bits |
| EP0142941A1 (en) * | 1983-10-24 | 1985-05-29 | Smith International, Inc. | Rock bit cutter cones having metallurgically bonded cutter inserts |
| EP0156235A2 (en) * | 1984-03-26 | 1985-10-02 | Eastman Christensen Company | Multi-component cutting element using consolidated rod-like polycrystalline diamond |
| EP0156264A2 (en) * | 1984-03-26 | 1985-10-02 | Eastman Christensen Company | Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks |
| EP0157278A2 (en) * | 1984-03-26 | 1985-10-09 | Eastman Christensen Company | Multi-component cutting element using polycrystalline diamond disks |
| EP0169718A2 (en) * | 1984-07-23 | 1986-01-29 | CDP, Ltd. | Conical cutters for drill bits and processes to produce same |
| EP0177209A2 (en) * | 1984-10-01 | 1986-04-09 | CDP, Ltd. | Consolidation of a part from separate metallic components |
| US4593776A (en) * | 1984-03-28 | 1986-06-10 | Smith International, Inc. | Rock bits having metallurgically bonded cutter inserts |
| GB2328233A (en) * | 1997-08-15 | 1999-02-17 | Smith International | A drill bit with areas of differing wear resistance and a method of its production |
| EP1270118A1 (en) * | 2001-06-29 | 2003-01-02 | Turbolite AG | Cutting elements |
| FR2941739A1 (en) * | 2009-01-30 | 2010-08-06 | Halliburton Energy Serv Inc | DOUBLE MATRIX DRILLING TOOL SURFACE COMPOSITIONS AND METHODS OF MAKING |
| US11187045B2 (en) | 2018-01-08 | 2021-11-30 | Element Six Gmbh | Drill bit with wear shield |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6965095B2 (en) * | 2017-10-18 | 2021-11-10 | 旭ダイヤモンド工業株式会社 | Drilling bit |
| JP7213692B2 (en) * | 2019-01-09 | 2023-01-27 | 旭ダイヤモンド工業株式会社 | bit for drilling |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2371489A (en) * | 1943-08-09 | 1945-03-13 | Sam P Daniel | Drill bit |
| FR1248524A (en) * | 1959-11-05 | 1960-12-16 | Europ De Turboforage Soc | Drill bit for soil drilling |
| US3471921A (en) * | 1965-12-23 | 1969-10-14 | Shell Oil Co | Method of connecting a steel blank to a tungsten bit body |
| US3938599A (en) * | 1974-03-27 | 1976-02-17 | Hycalog, Inc. | Rotary drill bit |
| DE2719330C3 (en) * | 1977-04-30 | 1984-01-05 | Christensen, Inc., 84115 Salt Lake City, Utah | Rotary drill bit |
| DE2917664C2 (en) * | 1979-05-02 | 1982-12-09 | Christensen, Inc., 84115 Salt Lake City, Utah | Rotary drill bit for deep drilling |
-
1980
- 1980-08-08 DE DE3030010A patent/DE3030010C2/en not_active Expired
-
1981
- 1981-07-13 MX MX188271A patent/MX155881A/en unknown
- 1981-07-22 NL NL8103467A patent/NL8103467A/en not_active Application Discontinuation
- 1981-07-24 BE BE0/205494A patent/BE889745A/en not_active IP Right Cessation
- 1981-07-29 AU AU73550/81A patent/AU541630B2/en not_active Ceased
- 1981-07-29 CA CA000382747A patent/CA1161028A/en not_active Expired
- 1981-07-30 FR FR8114874A patent/FR2488324B1/en not_active Expired
- 1981-08-05 GB GB8123930A patent/GB2081347B/en not_active Expired
- 1981-08-07 JP JP56123189A patent/JPS5761187A/en active Granted
Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0087283A1 (en) * | 1982-02-20 | 1983-08-31 | Unicorn Industries Plc | Rotary drilling bits |
| US4505342A (en) * | 1982-11-22 | 1985-03-19 | Nl Industries, Inc. | Drill bit |
| EP0117506A2 (en) * | 1983-02-24 | 1984-09-05 | Eastman Christensen Company | A cutting tooth and a rotating bit having a fully exposed polycrystalline diamond element |
| EP0117506A3 (en) * | 1983-02-24 | 1986-01-29 | Norton Christensen, Inc. | A cutting tooth and a rotating bit having a fully exposed polycrystalline diamond element |
| EP0121124A2 (en) * | 1983-03-07 | 1984-10-10 | Eastman Christensen Company | An improved diamond cutting element in a rotating bit |
| US4491188A (en) * | 1983-03-07 | 1985-01-01 | Norton Christensen, Inc. | Diamond cutting element in a rotating bit |
| EP0121124A3 (en) * | 1983-03-07 | 1986-01-29 | Norton Christensen, Inc. | An improved diamond cutting element in a rotating bit |
| EP0121802A2 (en) * | 1983-03-14 | 1984-10-17 | Eastman Christensen Company | Tooth configuration for an earth boring bit |
| US4499959A (en) * | 1983-03-14 | 1985-02-19 | Christensen, Inc. | Tooth configuration for an earth boring bit |
| EP0121802A3 (en) * | 1983-03-14 | 1986-01-29 | Norton Christensen, Inc. | Tooth configuration for an earth boring bit |
| EP0142941A1 (en) * | 1983-10-24 | 1985-05-29 | Smith International, Inc. | Rock bit cutter cones having metallurgically bonded cutter inserts |
| EP0140676A2 (en) * | 1983-10-29 | 1985-05-08 | Reed Tool Company Limited | Improvements in or relating to rotary drill bits |
| EP0140676A3 (en) * | 1983-10-29 | 1986-02-12 | Nl Petroleum Products Limited | Improvements in or relating to rotary drill bits |
| EP0156235B1 (en) * | 1984-03-26 | 1989-05-24 | Eastman Christensen Company | Multi-component cutting element using consolidated rod-like polycrystalline diamond |
| EP0156235A2 (en) * | 1984-03-26 | 1985-10-02 | Eastman Christensen Company | Multi-component cutting element using consolidated rod-like polycrystalline diamond |
| EP0157278A2 (en) * | 1984-03-26 | 1985-10-09 | Eastman Christensen Company | Multi-component cutting element using polycrystalline diamond disks |
| EP0156264A2 (en) * | 1984-03-26 | 1985-10-02 | Eastman Christensen Company | Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks |
| EP0156264B1 (en) * | 1984-03-26 | 1990-09-05 | Eastman Christensen Company | Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks |
| EP0157278B1 (en) * | 1984-03-26 | 1989-11-02 | Eastman Christensen Company | Multi-component cutting element using polycrystalline diamond disks |
| US4593776A (en) * | 1984-03-28 | 1986-06-10 | Smith International, Inc. | Rock bits having metallurgically bonded cutter inserts |
| EP0169718A3 (en) * | 1984-07-23 | 1987-01-21 | Cdp, Ltd. | Conical cutters for drill bits and processes to produce same |
| EP0169718A2 (en) * | 1984-07-23 | 1986-01-29 | CDP, Ltd. | Conical cutters for drill bits and processes to produce same |
| EP0177209A3 (en) * | 1984-10-01 | 1986-09-24 | CDP, Ltd. | Consolidation of a part from separate metallic components |
| EP0177209A2 (en) * | 1984-10-01 | 1986-04-09 | CDP, Ltd. | Consolidation of a part from separate metallic components |
| GB2328233A (en) * | 1997-08-15 | 1999-02-17 | Smith International | A drill bit with areas of differing wear resistance and a method of its production |
| US6095265A (en) * | 1997-08-15 | 2000-08-01 | Smith International, Inc. | Impregnated drill bits with adaptive matrix |
| GB2328233B (en) * | 1997-08-15 | 2002-01-16 | Smith International | Drill bit and method |
| EP1270118A1 (en) * | 2001-06-29 | 2003-01-02 | Turbolite AG | Cutting elements |
| FR2941739A1 (en) * | 2009-01-30 | 2010-08-06 | Halliburton Energy Serv Inc | DOUBLE MATRIX DRILLING TOOL SURFACE COMPOSITIONS AND METHODS OF MAKING |
| US11187045B2 (en) | 2018-01-08 | 2021-11-30 | Element Six Gmbh | Drill bit with wear shield |
| EP3737825B1 (en) * | 2018-01-08 | 2022-07-20 | Element Six Gmbh | Drill bit with wear shield |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2081347B (en) | 1984-05-10 |
| NL8103467A (en) | 1982-03-01 |
| DE3030010C2 (en) | 1982-09-16 |
| AU541630B2 (en) | 1985-01-17 |
| MX155881A (en) | 1988-02-08 |
| CA1161028A (en) | 1984-01-24 |
| JPS5761187A (en) | 1982-04-13 |
| DE3030010A1 (en) | 1982-02-25 |
| JPS6364595B2 (en) | 1988-12-13 |
| FR2488324B1 (en) | 1985-11-15 |
| BE889745A (en) | 1981-11-16 |
| FR2488324A1 (en) | 1982-02-12 |
| AU7355081A (en) | 1982-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 20010804 |