WO2008112262B1 - Method of forming pockets for receiving drill bit cutting elements - Google Patents

Method of forming pockets for receiving drill bit cutting elements

Info

Publication number
WO2008112262B1
WO2008112262B1 PCT/US2008/003302 US2008003302W WO2008112262B1 WO 2008112262 B1 WO2008112262 B1 WO 2008112262B1 US 2008003302 W US2008003302 W US 2008003302W WO 2008112262 B1 WO2008112262 B1 WO 2008112262B1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting element
recess
bit body
element pocket
earth
Prior art date
Application number
PCT/US2008/003302
Other languages
French (fr)
Other versions
WO2008112262A1 (en
Inventor
James L Duggan
John H Stevens
Redd H Smith
Original Assignee
Baker Hughes Inc
James L Duggan
John H Stevens
Redd H Smith
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 Baker Hughes Inc, James L Duggan, John H Stevens, Redd H Smith filed Critical Baker Hughes Inc
Priority to EP08726771A priority Critical patent/EP2129860B1/en
Priority to CA002679749A priority patent/CA2679749A1/en
Priority to AT08726771T priority patent/ATE530732T1/en
Priority to PL08726771T priority patent/PL2129860T3/en
Publication of WO2008112262A1 publication Critical patent/WO2008112262A1/en
Publication of WO2008112262B1 publication Critical patent/WO2008112262B1/en

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
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements
    • 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

Abstract

Methods of forming cutting element pockets in earth-boring tools include machining at least one recess (52) to define at least one surface of a cutting element pocket using a cutter (56) oriented at an angle to a longitudinal axis of the cutting element pocket. Methods of forming earth-boring tools include forming a bit body (50) and forming at least one cutting element pocket therein using a rotating cutter oriented at an angle relative to a longitudinal axis (60) of the cutting element pocket being formed. Earth-boring tools have a bit body comprising a first surface defining a lateral sidewall (55) of a cutting element pocket, a second surface defining an end wall (66) of the cutting element pocket, and another surface defining a groove located between the first and second surfaces that extends into the body to enable a cutting element (18) to abut against an area of the lateral sidewall and end wall of the pocket.

Claims

AMENDED CLAIMS received by the International Bureau on 19 September 2008 (19.09.2008)
1. A method comprising forming at least one cutting element pocket in an earth-boring tool, the method comprising machining a first recess in an earth-boring tool and defining a lateral sidewall surface of at least one cutting element pocket using a rotating cutter oriented at an angle relative to a longitudinal axis of the at least one cutting element pocket, the method characterized by further comprising: machining a second recess in the earth-boring tool and defining at least a portion of a substantially planar back end surface of the at least one cutting element pocket; and forming the lateral sidewall surface and the back end surface of the at least one cutting element pocket to enable a generally cylindrical cutting element having a substantially planar back end surface to simultaneously abut against an area of each of the lateral sidewall surface and the back end surface of the at least one cutting element pocket.
2. The method of claim 1 , further comprising: forming a bit body; and forming the at least one cutting element pocket in the bit body.
3. The method of claim 2, wherein forming a bit body comprises: providing a powder mixture; and pressing the powder mixture to form a green bit body.
4. The method of claim 2, wherein forming a bit body comprises forming a bit body predominantly comprised of a metal or metal alloy.
5. The method of claim 1 or claim 2, wherein using a rotating cutter comprises using an endmill cutter.
6. The method of claim 1 or claim 2, wherein machining a second recess further comprises machining the second recess after machining the first recess.
7. The method of claim 1 or claim 2, wherein machining a second recess further comprises machining the second recess prior to machining the first recess.
8. The method of claim 1 or claim 2, wherein machining a second recess further comprises using the same rotating cutter used to machine the first recess to machine the second recess.
9. The method of claim 2, wherein machining a second recess in the bit body comprises machining a groove in a surface of the bit body exposed within the first recess.
10. The method of claim 2, wherein machining a second recess in the bit body comprises machining a generally planar recess in the bit body oriented substantially transverse to the longitudinal axis of the at least one cutting element pocket.
11. The method of claim 1 or 2, further comprising: securing a cutting element within the at least one cutting element pocket; and filling at least a portion of a void within at least one of the first recess and the second recess around the cutting element with a filler material.
12. The method of claim 1 or 2, wherein forming the lateral sidewall surface and the back end surface of the at least one cutting element pocket to enable a generally cylindrical cutting element to simultaneously abut against each of the lateral sidewall surface and the back end surface of the at least one cutting element pocket comprises causing at least a portion of the second recess to extend in a generally radially outward direction from the longitudinal axis of the at least one cutting element pocket beyond at least a portion of the lateral sidewall surface of the at least one cutting element pocket.
13. An earth-boring tool having a bit body comprising: a first surface defining a lateral sidewall surface of at least one cutting element pocket, at least a portion of the first surface having a generally cylindrical shape centered about a longitudinal axis of the at least one cutting element pocket; and a substantially planar second surface defining a back end surface of the at least one cutting element pocket; the earth-boring tool characterized in that the bit body further comprises: at least one additional surface defining a groove located between the first surface and the second surface and extending into the bit body in a generally radially outward direction from the longitudinal axis of the at least one cutting element pocket beyond the at least a portion of the first surface.
14. The earth-boring tool of claim 13, wherein the bit body is predominantly comprised of one of steel and a particle-matrix composite material.
15. The earth-boring tool of claim 13 or claim 14, further comprising a cutting element secured within the at least one cutting element pocket.
16. The earth-boring tool of claim 15, further comprising a filler material disposed within at least a portion of the at least one cutting element pocket around the cutting element.
17. The earth-boring tool of claim 16, wherein the filler material comprises at least one of a brazing alloy, a soldering alloy, a welding alloy, and a hardfacing material.
18. The earth-boring tool of claim 16, wherein the filler material comprises a preformed solid structure.
19. The earth-boring tool of claim 18, wherein the preformed solid structure is at least one of brazed, welded, and flamesprayed to the bit body.
20. The earth-boring tool of claim 18 or claim 19, wherein the preformed solid structure comprises a particle-matrix composite material.
PCT/US2008/003302 2007-03-13 2008-03-12 Method of forming pockets for receiving drill bit cutting elements WO2008112262A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP08726771A EP2129860B1 (en) 2007-03-13 2008-03-12 Method of forming pockets for receiving drill bit cutting elements
CA002679749A CA2679749A1 (en) 2007-03-13 2008-03-12 Method of forming pockets for receiving drill bit cutting elements
AT08726771T ATE530732T1 (en) 2007-03-13 2008-03-12 METHOD FOR FORMING POCKETS FOR RECEIVING DRILL BIT CUTTING ELEMENTS
PL08726771T PL2129860T3 (en) 2007-03-13 2008-03-12 Method of forming pockets for receiving drill bit cutting elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/717,905 2007-03-13
US11/717,905 US20080223622A1 (en) 2007-03-13 2007-03-13 Earth-boring tools having pockets for receiving cutting elements therein and methods of forming such pockets and earth-boring tools

Publications (2)

Publication Number Publication Date
WO2008112262A1 WO2008112262A1 (en) 2008-09-18
WO2008112262B1 true WO2008112262B1 (en) 2008-11-20

Family

ID=39580041

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/003302 WO2008112262A1 (en) 2007-03-13 2008-03-12 Method of forming pockets for receiving drill bit cutting elements

Country Status (8)

Country Link
US (1) US20080223622A1 (en)
EP (1) EP2129860B1 (en)
CN (1) CN101631928A (en)
AT (1) ATE530732T1 (en)
CA (1) CA2679749A1 (en)
PL (1) PL2129860T3 (en)
RU (1) RU2009137615A (en)
WO (1) WO2008112262A1 (en)

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Also Published As

Publication number Publication date
EP2129860B1 (en) 2011-10-26
RU2009137615A (en) 2011-04-20
EP2129860A1 (en) 2009-12-09
PL2129860T3 (en) 2012-03-30
ATE530732T1 (en) 2011-11-15
WO2008112262A1 (en) 2008-09-18
CA2679749A1 (en) 2008-09-18
US20080223622A1 (en) 2008-09-18
CN101631928A (en) 2010-01-20

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