EP0096591A2 - Drilling bit - Google Patents

Drilling bit Download PDF

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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Withdrawn
Application number
EP83303312A
Other languages
German (de)
French (fr)
Other versions
EP0096591A3 (en
Inventor
Noel Cuthbert Pope
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boart International Ltd
Original Assignee
Boart International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boart International Ltd filed Critical Boart International Ltd
Publication of EP0096591A2 publication Critical patent/EP0096591A2/en
Publication of EP0096591A3 publication Critical patent/EP0096591A3/en
Withdrawn legal-status Critical Current

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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

    FIELD OF THE INVENTION
  • 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.
    • BACKGROUND OF THE INVENTION
  • 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.
    • SUMMARY OF THE INVENTION
  • 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.
    • DESCRIPTION OF THE DRAWING
  • It shows a series of graphs illustrating the performances of various bits.
    • DESCRIPTION OF EMBODIMENTS
  • Four bits were prepared and used in drilling tests to determine their performances. Each bit had the same diamond concentration, viz. 40 concentration and the diamond particles were 35/40 mesh. The bits had the same commercial bronze matrix to which silicon carbide was added as follows:
    Figure imgb0001
  • 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.
EP83303312A 1982-06-08 1983-06-08 Drilling bit Withdrawn EP0096591A3 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (9)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
EP0096591A3 (en) 1984-07-11
AU1532583A (en) 1983-12-15
ZW12583A1 (en) 1983-08-24
AU555981B2 (en) 1986-10-16
GB8315537D0 (en) 1983-07-13

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Inventor name: POPE, NOEL CUTHBERT