EP0096591A2 - Drilling bit - Google Patents
Drilling bit Download PDFInfo
- Publication number
- EP0096591A2 EP0096591A2 EP83303312A EP83303312A EP0096591A2 EP 0096591 A2 EP0096591 A2 EP 0096591A2 EP 83303312 A EP83303312 A EP 83303312A EP 83303312 A EP83303312 A EP 83303312A EP 0096591 A2 EP0096591 A2 EP 0096591A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- particles
- matrix
- diamond
- scouring agent
- 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.)
- Withdrawn
Links
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
Definitions
- This invention relates to an impregnated diamond drilling bit for attachment to the end of a drill string.
- the invention is particularly, but not exclusively, applicable to coring crowns which cut rock cores.
- Known impregnated coring crowns consist of a head (which performs the actual drilling) in the form of a matrix, prepared by powder metallurgical methods, in which the diamond particles are distributed as homogeneously as possible.
- the matrix consists of a bronze.
- the matrix consists of one of, or a mixture of, tungsten, tungsten carbide, nickel and many other metals and refractory carbides infiltrated with a nickel bronze.
- the matrix depending on its composition may be prepared by either hot-pressing or by infiltration.
- an impregnated drilling bit which has a working face, the working face having diamond particles embedded in a matrix and the matrix including particles of a scouring agent selected from the group consisting of alumina, boron carbide and silicon carbide, the scouring agent particles being not larger than the diamond particles and preferably between one quarter and two thirds of the size of the diamond particles.
- the scouring agent particles are brittle and hard and have a limited ability to bond to the matrix.
- the scouring agent particles are preferably silicon carbide particles which are between one half and two thirds of the size of the diamond particles.
- the silicon carbide particles are present in sufficient quantities that when they tear loose they will scour away matrix from around the diamond particles.
- the matrix and the scouring agent In choosing the matrix and the scouring agent, one must firstly ensure that the diamond particles will be firmly held. Secondly the scouring agent particles must break away in time to erode the matrix to keep the bit open, but not so soon as to deprive the working diamond particles of the support of the matrix.
Abstract
In a diamond impregnated bit scourer particles in the form of silicon carbide are added to the matrix. The mesh size of the silicon carbide is less than that of diamond and the concentration preferably about 40, if the diamond concentration is 40.
Description
- This invention relates to an impregnated diamond drilling bit for attachment to the end of a drill string. The invention is particularly, but not exclusively, applicable to coring crowns which cut rock cores.
- Known impregnated coring crowns consist of a head (which performs the actual drilling) in the form of a matrix, prepared by powder metallurgical methods, in which the diamond particles are distributed as homogeneously as possible. In some instances the matrix consists of a bronze. In other cases, the matrix consists of one of, or a mixture of, tungsten, tungsten carbide, nickel and many other metals and refractory carbides infiltrated with a nickel bronze. The matrix depending on its composition may be prepared by either hot-pressing or by infiltration.
- Under the action of the applied forces on the bit resulting from the drilling machine acting on the rotating drill string behind the bit, the pressure that the individual diamond particles exert on small areas of the rock causes the rock to fragment into small particles. As the drilling proceeds the exposed surface of each diamond particle wears, and the matrix in between is also worn away. Should the matrix wear be insufficient, the active particles of diamond will eventually be worn flush with the matrix and new particles will not be exposed at a sufficiently fast rate, drilling will no longer be possible and the bit can be said to have become "closed up".
- It is an object of the invention to provide a matrix which will substantially ameliorate the above problems.
- According to the present invention, there is provided an impregnated drilling bit which has a working face, the working face having diamond particles embedded in a matrix and the matrix including particles of a scouring agent selected from the group consisting of alumina, boron carbide and silicon carbide, the scouring agent particles being not larger than the diamond particles and preferably between one quarter and two thirds of the size of the diamond particles. The scouring agent particles are brittle and hard and have a limited ability to bond to the matrix.
- When scouring agent particles are released during drilling operations they have the effect of scouring matrix from around the diamond particles and assist in maintaining a gap between the matrix at the face of the bit and the rock such that the bit remains open and can continue to drill efficiently.
- The scouring agent particles are preferably silicon carbide particles which are between one half and two thirds of the size of the diamond particles. The silicon carbide particles are present in sufficient quantities that when they tear loose they will scour away matrix from around the diamond particles.
- Another -scouring agent which may be used in the present invention is alumina.
- In choosing the matrix and the scouring agent, one must firstly ensure that the diamond particles will be firmly held. Secondly the scouring agent particles must break away in time to erode the matrix to keep the bit open, but not so soon as to deprive the working diamond particles of the support of the matrix.
- It shows a series of graphs illustrating the performances of various bits.
-
- In the attached graph the performances of the four bits are illustrated, graph No. showing that of Bit No. 1 and so on.
- It will be seen that except during the very early stages the load required for drilling to the same depth is much larger for a bit with no SiC than for the other three bits. Also too much scouring agent (graph 2) is not to be recommended. 50/60 mesh and 45/50 mesh of the SiC work equally well.
Claims (3)
1. An impregnated drilling bit which has a working face, the working face having diamond particles embedded in a matrix and the matrix including particles of a scouring agent selected from the group consisting of alumina, boron carbide and silicon carbide, the scouring agent particles being not larger than the diamond particles.
2. The impregnated drilling bit claimed in claim 1 in which the scouring agent particles are between one quarter and two thirds of the size of the diamond particles.
3. The impregnated drilling crown claimed in either one of the above claims in which the scouring agent is silicon carbide.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA824008 | 1982-06-08 | ||
ZA824008 | 1982-06-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0096591A2 true EP0096591A2 (en) | 1983-12-21 |
EP0096591A3 EP0096591A3 (en) | 1984-07-11 |
Family
ID=25576115
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83303312A Withdrawn EP0096591A3 (en) | 1982-06-08 | 1983-06-08 | Drilling bit |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0096591A3 (en) |
AU (1) | AU555981B2 (en) |
GB (1) | GB8315537D0 (en) |
ZW (1) | ZW12583A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0312487A1 (en) * | 1987-10-13 | 1989-04-19 | Eastman Teleco Company | Earth boring drill bit with matrix displacing material |
US5090491A (en) * | 1987-10-13 | 1992-02-25 | Eastman Christensen Company | Earth boring drill bit with matrix displacing material |
US5839329A (en) * | 1994-03-16 | 1998-11-24 | Baker Hughes Incorporated | Method for infiltrating preformed components and component assemblies |
US6073518A (en) * | 1996-09-24 | 2000-06-13 | Baker Hughes Incorporated | Bit manufacturing method |
CN1053409C (en) * | 1993-05-11 | 2000-06-14 | 中南工业大学 | Method for making diamond tool containing surface-metallized ceramic phase |
US6082461A (en) * | 1996-07-03 | 2000-07-04 | Ctes, L.C. | Bore tractor system |
US6200514B1 (en) | 1999-02-09 | 2001-03-13 | Baker Hughes Incorporated | Process of making a bit body and mold therefor |
US6209420B1 (en) | 1994-03-16 | 2001-04-03 | Baker Hughes Incorporated | Method of manufacturing bits, bit components and other articles of manufacture |
US6454030B1 (en) | 1999-01-25 | 2002-09-24 | Baker Hughes Incorporated | Drill bits and other articles of manufacture including a layer-manufactured shell integrally secured to a cast structure and methods of fabricating same |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL52174C (en) * | 1900-01-01 | |||
US2381415A (en) * | 1943-11-19 | 1945-08-07 | Jr Edward B Williams | Drill bit |
DE853582C (en) * | 1943-03-19 | 1952-10-27 | Hartmetallwerkzeugfabrik Meuts | Core drill bit for rotary drilling in the rock |
US2883520A (en) * | 1957-01-14 | 1959-04-21 | Pennsylvania Furnace And Iron | Light unit for vehicles |
US3175260A (en) * | 1961-09-06 | 1965-03-30 | Jersey Prod Res Co | Process for making metal carbide hard surfacing material and composite casting |
US3736995A (en) * | 1972-06-16 | 1973-06-05 | A Salter | Diamond-impregnated masonry bit with radially-stepped cutting faces |
US3757878A (en) * | 1972-08-24 | 1973-09-11 | Christensen Diamond Prod Co | Drill bits and method of producing drill bits |
US3885637A (en) * | 1973-01-03 | 1975-05-27 | Vladimir Ivanovich Veprintsev | Boring tools and method of manufacturing the same |
US4290498A (en) * | 1979-04-11 | 1981-09-22 | Triplett William C | Ablatible drill |
-
1983
- 1983-06-01 ZW ZW125/83A patent/ZW12583A1/en unknown
- 1983-06-02 AU AU15325/83A patent/AU555981B2/en not_active Ceased
- 1983-06-07 GB GB838315537A patent/GB8315537D0/en active Pending
- 1983-06-08 EP EP83303312A patent/EP0096591A3/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL52174C (en) * | 1900-01-01 | |||
DE853582C (en) * | 1943-03-19 | 1952-10-27 | Hartmetallwerkzeugfabrik Meuts | Core drill bit for rotary drilling in the rock |
US2381415A (en) * | 1943-11-19 | 1945-08-07 | Jr Edward B Williams | Drill bit |
US2883520A (en) * | 1957-01-14 | 1959-04-21 | Pennsylvania Furnace And Iron | Light unit for vehicles |
US3175260A (en) * | 1961-09-06 | 1965-03-30 | Jersey Prod Res Co | Process for making metal carbide hard surfacing material and composite casting |
US3736995A (en) * | 1972-06-16 | 1973-06-05 | A Salter | Diamond-impregnated masonry bit with radially-stepped cutting faces |
US3757878A (en) * | 1972-08-24 | 1973-09-11 | Christensen Diamond Prod Co | Drill bits and method of producing drill bits |
US3885637A (en) * | 1973-01-03 | 1975-05-27 | Vladimir Ivanovich Veprintsev | Boring tools and method of manufacturing the same |
US4290498A (en) * | 1979-04-11 | 1981-09-22 | Triplett William C | Ablatible drill |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5090491A (en) * | 1987-10-13 | 1992-02-25 | Eastman Christensen Company | Earth boring drill bit with matrix displacing material |
EP0312487A1 (en) * | 1987-10-13 | 1989-04-19 | Eastman Teleco Company | Earth boring drill bit with matrix displacing material |
CN1053409C (en) * | 1993-05-11 | 2000-06-14 | 中南工业大学 | Method for making diamond tool containing surface-metallized ceramic phase |
US6209420B1 (en) | 1994-03-16 | 2001-04-03 | Baker Hughes Incorporated | Method of manufacturing bits, bit components and other articles of manufacture |
US5839329A (en) * | 1994-03-16 | 1998-11-24 | Baker Hughes Incorporated | Method for infiltrating preformed components and component assemblies |
US6581671B2 (en) | 1994-03-16 | 2003-06-24 | Baker Hughes Incorporated | System for infiltrating preformed components and component assemblies |
US6354362B1 (en) | 1994-03-16 | 2002-03-12 | Baker Hughes Incorporated | Method and apparatus for infiltrating preformed components and component assemblies |
US6082461A (en) * | 1996-07-03 | 2000-07-04 | Ctes, L.C. | Bore tractor system |
US6073518A (en) * | 1996-09-24 | 2000-06-13 | Baker Hughes Incorporated | Bit manufacturing method |
US6089123A (en) * | 1996-09-24 | 2000-07-18 | Baker Hughes Incorporated | Structure for use in drilling a subterranean formation |
US6454030B1 (en) | 1999-01-25 | 2002-09-24 | Baker Hughes Incorporated | Drill bits and other articles of manufacture including a layer-manufactured shell integrally secured to a cast structure and methods of fabricating same |
US6655481B2 (en) | 1999-01-25 | 2003-12-02 | Baker Hughes Incorporated | Methods for fabricating drill bits, including assembling a bit crown and a bit body material and integrally securing the bit crown and bit body material to one another |
US6200514B1 (en) | 1999-02-09 | 2001-03-13 | Baker Hughes Incorporated | Process of making a bit body and mold therefor |
Also Published As
Publication number | Publication date |
---|---|
GB8315537D0 (en) | 1983-07-13 |
ZW12583A1 (en) | 1983-08-24 |
AU555981B2 (en) | 1986-10-16 |
EP0096591A3 (en) | 1984-07-11 |
AU1532583A (en) | 1983-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT NL SE |
|
17P | Request for examination filed |
Effective date: 19840813 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19860520 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: POPE, NOEL CUTHBERT |