EP0315221A3 - Rotary drill bits and methods of manufacturing such bits - Google Patents

Rotary drill bits and methods of manufacturing such bits Download PDF

Info

Publication number
EP0315221A3
EP0315221A3 EP88120448A EP88120448A EP0315221A3 EP 0315221 A3 EP0315221 A3 EP 0315221A3 EP 88120448 A EP88120448 A EP 88120448A EP 88120448 A EP88120448 A EP 88120448A EP 0315221 A3 EP0315221 A3 EP 0315221A3
Authority
EP
European Patent Office
Prior art keywords
cutting element
thickness
bit body
backing layer
terms
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Withdrawn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
EP88120448A
Other languages
German (de)
French (fr)
Other versions
EP0315221A2 (en
Inventor
John Denzil Barr
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.)
Camco Drilling Group Ltd
Original Assignee
Reed Tool Co 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
Priority claimed from GB858505244A external-priority patent/GB8505244D0/en
Application filed by Reed Tool Co Ltd filed Critical Reed Tool Co Ltd
Priority to EP88120448A priority Critical patent/EP0315221A3/en
Publication of EP0315221A2 publication Critical patent/EP0315221A2/en
Publication of EP0315221A3 publication Critical patent/EP0315221A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/573—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element
    • E21B10/5735—Interface between the substrate and the cutting element
    • 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

Abstract

A rotary drill bit comprises a bit body having a shank for connection to a drill string, a plurality of cutting elements mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit body, each cutting element comprising a thin hard facing layer, for example poly­ crystalline diamond, bonded to a less hard backing layer, for example tungsten carbide. The maximum instantaneous load to which each cutting element may be subject in use is reduced by reducing the thickness of the cutting element. The thickness of cutting element necessary to achieve the required object is defined, alternatively, in terms of the absolute dimensions of the cutting element or backing layer, in terms of the relative thickness of the backing layer and hard facing layer, or in terms of the thickness of the cutting element or backing layer in relation to the overall dimensions of the cutting face.
EP88120448A 1985-02-28 1986-02-21 Rotary drill bits and methods of manufacturing such bits Withdrawn EP0315221A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP88120448A EP0315221A3 (en) 1985-02-28 1986-02-21 Rotary drill bits and methods of manufacturing such bits

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB858505244A GB8505244D0 (en) 1985-02-28 1985-02-28 Rotary drill bits
GB8505244 1985-02-28
EP88120448A EP0315221A3 (en) 1985-02-28 1986-02-21 Rotary drill bits and methods of manufacturing such bits

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP86301244A Division EP0193361B1 (en) 1985-02-28 1986-02-21 Rotary drill bits and methods of manufacturing such bits'
EP86301244.9 Division 1986-02-21

Publications (2)

Publication Number Publication Date
EP0315221A2 EP0315221A2 (en) 1989-05-10
EP0315221A3 true EP0315221A3 (en) 1989-10-25

Family

ID=26114791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120448A Withdrawn EP0315221A3 (en) 1985-02-28 1986-02-21 Rotary drill bits and methods of manufacturing such bits

Country Status (1)

Country Link
EP (1) EP0315221A3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2789004A1 (en) * 1999-02-02 2000-08-04 Jackson E Wetzel Polishing tool for TV screens comprises rubber support disc with steel pegs attached

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186628A (en) * 1976-11-30 1980-02-05 General Electric Company Rotary drill bit and method for making same
GB2084219A (en) * 1980-09-25 1982-04-07 Nl Industries Inc Mounting of cutters on cutting tools
EP0079243A1 (en) * 1981-11-09 1983-05-18 Sumitomo Electric Industries Limited A composite compact component comprising a diamond or boron nitride compact

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186628A (en) * 1976-11-30 1980-02-05 General Electric Company Rotary drill bit and method for making same
GB2084219A (en) * 1980-09-25 1982-04-07 Nl Industries Inc Mounting of cutters on cutting tools
EP0079243A1 (en) * 1981-11-09 1983-05-18 Sumitomo Electric Industries Limited A composite compact component comprising a diamond or boron nitride compact

Also Published As

Publication number Publication date
EP0315221A2 (en) 1989-05-10

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