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Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture

Info

Publication number
CA2602020A1
CA2602020A1 CA 2602020 CA2602020A CA2602020A1 CA 2602020 A1 CA2602020 A1 CA 2602020A1 CA 2602020 CA2602020 CA 2602020 CA 2602020 A CA2602020 A CA 2602020A CA 2602020 A1 CA2602020 A1 CA 2602020A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
bit
weld
drill
shank
body
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
Application number
CA 2602020
Other languages
French (fr)
Other versions
CA2602020C (en )
Inventor
Anton F. Zahradnik
Eric C. Sullivan
R. Scot Smith
Daniel E. Ruff
Danielle V. Roberts
Alan J. Massey
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.)
Baker Hughes Inc
Original Assignee
Baker Hughes Incorporated
Anton F. Zahradnik
Eric C. Sullivan
R. Scot Smith
Daniel E. Ruff
Danielle V. Roberts
Alan J. Massey
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

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/42Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits

Abstract

A shank configuration for rotary drill bits, is disclosed for positioning of the shank in relation to the bit body. A tapered surface or feature of the shank may be configured and sized to matingly engage a complementarily shaped surface or feature of the drill bit body and thereby become centered or positioned in relation thereto. A deformable element may be disposed between the shank and bit body. Also, the shank may comprise a material having a carbon equivalent of less than about 0.35%. A multi-pass weld procedure may be employed to affix the shank and bit body to one another wherein welds may be formed so that one weld originates at a circumferential position that differs from the origination circumferential position of its immediately preceding weld by at least about 90~. Further, a stress state may be developed within the multi-pass weld. A method of manufacture is also disclosed.

Claims (31)

1. A rotary drill bit for drilling a subterranean formation, comprising:
a bit body having a centerline and including a leading end for contacting a formation during drilling;
a shank structure, comprising:
at least one tapered feature matingly engaging at least one complementary feature of the bit body and at least in part positioning the shank structure in relation to the bit body; and a trailing end having structure associated therewith for connecting the rotary drill bit to a drill string;
a weld region substantially formed by at least one surface of the shank structure and at least one surface of the bit body;
a multi-pass weld affixing the shank structure to the bit body substantially disposed within the weld region, comprising:
a first plurality of welds comprising:
a first weld originating from a first circumferential position; and a second weld originating from a second circumferential position;
wherein the second circumferential position and the first circumferential position are separated by at least about 90°
in relation to the centerline of the bit body; and at least one cutting element secured to the bit body.
2. The rotary drill bit of claim 1, wherein the shank structure comprises a material having a carbon equivalent of less than about 0.35%.
3. The rotary drill bit of claim 1, wherein the multi-pass weld exhibits a stress state at least in part responsive to a force applied between the at least one tapered feature of the shank structure and the at least one complementary feature of the bit body during formation of the multi-pass weld.
4. The rotary drill bit of claim 1, wherein the weld region comprises a substantially annular groove.
5. The rotary drill bit of claim 4, wherein the first weld and second weld extend circumferentially.
6. The rotary drill bit of claim 1, wherein the weld region comprises a plurality of weld recesses formed by circumferential alignment of longitudinal recesses of the shank structure and longitudinal recesses of the bit body.
7. The rotary drill bit of claim 6, wherein the first weld and the second weld extend longitudinally within respective, circumferentially aligned longitudinal recesses of the shank structure and the bit body.
8. The rotary drill bit of claim 1, wherein a portion of the shank structure is disposed within a cavity formed within the bit body.
9. The rotary drill bit of claim 8, wherein the at least one complementary feature of the bit body forms at least a portion of the cavity.
10. The rotary drill bit of claim 1, further comprising at least one other weld, wherein a circumferential position of origination of the at least one other weld is separated by at least about 90° from the second circumferential position of the second weld.
11. The rotary drill bit of claim 10, wherein the at least one other weld comprises a second plurality of welds;
wherein each of the second plurality of welds includes a circumferential position of origination, respectively; and wherein the circumferential position of origination of each of the second plurality of welds is separated from a circumferential position of origination of its immediately preceding weld by at least 90°.
12. The rotary drill bit of claim 11, wherein the circumferential positions of origination of the welds of the first plurality of welds and the circumferential positions of origination of the welds of the second plurality of welds are positioned substantially symmetrically in relation to a circumference of the weld region.
13. The rotary drill bit of claim 1, further comprising a deformable element disposed between the shank structure and the bit body.
14. The rotary drill bit of claim 13, wherein the deformable element exhibits compressive stress generated between one or more surfaces of the shank structure and one or more surfaces of the bit body.
15. The rotary drill bit of claim 13, wherein the multi-pass weld exhibits a stress state at least in part responsive to a stress generated between one or more surfaces of the shank structure and one or more surfaces of the bit body.
16. The rotary drill bit of claim 1, wherein the at least one complementary feature of the bit body forms a cavity therein.
17. The rotary drill bit of claim 16, wherein a portion of the shank structure is disposed within the cavity formed within the bit body.
18. A method of fabricating a rotary drill bit, comprising:
providing a shank structure for attaching the rotary drill bit to a drill string configured with at least one tapered feature for positioning the shank structure;
providing a bit body having an end configured for drilling a subterranean formation, the bit body including at least one complementary feature for positioning the shank structure in relation thereto;
positioning the shank structure by matingly engaging the at least one tapered feature of the shank structure and the at least one complementary feature of the bit body and defining a weld region between the shank structure and the bit body;

forming a first weld originating from a first circumferential position within the weld region;
forming at least a second weld originating from a second circumferential position within the weld region;
wherein the second circumferential position and the first circumferential position are separated by at least about 90° in relation to the centerline of the bit body.
19. The method of fabricating a rotary drill bit of claim 18, wherein providing the shank structure comprises providing a shank structure formed from a material having a carbon equivalent less than about 0.35%.
20. The method of fabricating a rotary drill bit of claim 18, wherein forming the first weld and forming the at least a second weld comprises forming the first weld and the at least a second weld substantially simultaneously.
21. The method of fabricating a rotary drill bit of claim 18, further comprising applying a compressive force between the at least one tapered feature of the shank structure and the at least one complementary feature of the bit body while forming the first weld.
22. The method of fabricating a rotary drill bit of claim 18, wherein the at least one complementary tapered of the bit body forms a cavity therein.
23. The method of fabricating a rotary drill bit of claim 22, further comprising disposing a portion of the shank structure within the cavity formed within the bit body.
24. The method of fabricating a rotary drill bit of claim 18, further comprising configuring the weld region to be a substantially annular groove.
25. The method of fabricating a rotary drill bit of claim 18,wherein forming at least a second weld comprises forming more than one weld, wherein each of the more than one weld includes a circumferential position of origination, respectively; and selecting an origination position of each of the more than one weld to be separated from the circumferential position of origination of its immediately preceding weld by at least about 90°.
26. The method of fabricating a rotary drill bit of claim 25, wherein forming the first weld and each of the more than one welds comprises forming a circumferentially extending weld.
27. The method of fabricating a rotary drill bit of claim 18, wherein positioning the shank structure by matingly engaging the at least one tapered feature of the shank structure and the at least one complementary feature of the bit body comprises deforming a deformable element positioned between the shank structure and the bit body.
28. The method of fabricating a rotary drill bit of claim 18, further comprising forming the first weld and the at least a second weld without preheating at least the shank structure.
29. A method of fabricating a rotary drill bit, comprising:
providing a shank structure for attaching the rotary drill bit to a drill string;
providing a bit body having an end configured for drilling a subterranean formation;
positioning the shank structure in contact with the bit body and defining a weld region between the shank structure and the bit body; and forming at least one weld within the weld region in the absence of preheating of at least the shank structure.
30. A rotary drill bit for drilling a subterranean formation, comprising:
a bit body having a centerline and including a leading end for contacting a formation during drilling;
a shank structure, comprising at least one frustoconical feature matingly engaging a complementary frustoconical feature of the bit body;
a weld recess substantially formed by at least one surface of the shank structure and at least one surface of the bit body;

at least one weld affixing the shank structure to the bit body substantially disposed within the weld recess; and at least one cutting element secured to the bit body.
31. A shank structure for a rotary drill bit, comprising:
at least one feature for engaging a complementary feature of a bit body;
a trailing end having structure associated therewith for connecting the rotary drill bit to a drill string; and wherein the shank structure comprises a material having a carbon equivalent less than about 0.35%.
CA 2602020 2005-03-25 2006-03-24 Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture Active CA2602020C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US11090932 US7472764B2 (en) 2005-03-25 2005-03-25 Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture
US11/090,932 2005-03-25
PCT/US2006/010775 WO2006104885A8 (en) 2005-03-25 2006-03-24 Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2690456 CA2690456A1 (en) 2005-03-25 2006-03-24 Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture

Publications (2)

Publication Number Publication Date
CA2602020A1 true true CA2602020A1 (en) 2006-10-05
CA2602020C CA2602020C (en) 2012-03-20

Family

ID=37034053

Family Applications (2)

Application Number Title Priority Date Filing Date
CA 2690456 Abandoned CA2690456A1 (en) 2005-03-25 2006-03-24 Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture
CA 2602020 Active CA2602020C (en) 2005-03-25 2006-03-24 Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA 2690456 Abandoned CA2690456A1 (en) 2005-03-25 2006-03-24 Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture

Country Status (6)

Country Link
US (4) US7472764B2 (en)
CN (1) CN101218413A (en)
CA (2) CA2690456A1 (en)
EP (1) EP1861577B1 (en)
RU (1) RU2007139282A (en)
WO (1) WO2006104885A8 (en)

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Also Published As

Publication number Publication date Type
US7472764B2 (en) 2009-01-06 grant
WO2006104885A8 (en) 2008-03-20 application
CA2602020C (en) 2012-03-20 grant
US7594454B2 (en) 2009-09-29 grant
US7861806B2 (en) 2011-01-04 grant
US20080066970A1 (en) 2008-03-20 application
WO2006104885A3 (en) 2007-07-19 application
EP1861577B1 (en) 2011-11-30 grant
US20060213693A1 (en) 2006-09-28 application
CN101218413A (en) 2008-07-09 application
EP1861577A2 (en) 2007-12-05 application
WO2006104885A2 (en) 2006-10-05 application
RU2007139282A (en) 2009-04-27 application
US7600589B2 (en) 2009-10-13 grant
CA2690456A1 (en) 2006-10-05 application
US20080066581A1 (en) 2008-03-20 application
US20100012392A1 (en) 2010-01-21 application

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