CA2505710A1 - Shaped cutter surface - Google Patents

Shaped cutter surface Download PDF

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Publication number
CA2505710A1
CA2505710A1 CA002505710A CA2505710A CA2505710A1 CA 2505710 A1 CA2505710 A1 CA 2505710A1 CA 002505710 A CA002505710 A CA 002505710A CA 2505710 A CA2505710 A CA 2505710A CA 2505710 A1 CA2505710 A1 CA 2505710A1
Authority
CA
Canada
Prior art keywords
cutter
working surface
shaped working
high point
relative high
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
CA002505710A
Other languages
French (fr)
Other versions
CA2505710C (en
Inventor
Yuelin Shen
Youhe Zhang
Zhou Yong
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.)
Smith International Inc
Original Assignee
Smith International, Inc.
Yuelin Shen
Youhe Zhang
Zhou Yong
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 US11/117,650 external-priority patent/US7798257B2/en
Application filed by Smith International, Inc., Yuelin Shen, Youhe Zhang, Zhou Yong filed Critical Smith International, Inc.
Publication of CA2505710A1 publication Critical patent/CA2505710A1/en
Application granted granted Critical
Publication of CA2505710C publication Critical patent/CA2505710C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • E21B10/5673—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a non planar or non circular cutting face
    • 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
    • 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

Abstract

A cutter for a drill bit used for drilling wells in a geological formation includes a shaped ultra hard working surface. The cutter with the shaped working surface is mounted on a drill bit to provide desired cutting characteristics.
The shaped working surface provides varied cutting characteristics depending upon the shape, and the characteristics can vary depending upon the depth of the cut.

Claims (37)

1. A cutter comprising:
a shaped working surface, wherein the shaped working surface comprises an axially asymmetrical curved surface.
2. The cutter of claim 1, wherein the shaped working surface comprises a smoothly continuous compound curve.
3. The cutter of claim 1, wherein the shaped working surface comprises a high point and a low point in an axial direction and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction and halfway between the high point and the low point, has an area that is greater than about 20% of the total area of the shaped working surface.
4. The cutter of claim 1, wherein the shaped working surface comprises a high point and a low point in an axial direction and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction and halfway between the high point and the low point, has a perimeter length that is greater than about 20% of a perimeter of the shaped working surface.
5. The cutter of claim 1, wherein the shaped working surface comprises a high point and a low point in an axial direction and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction and halfway between the high point and the low point, has an area that is greater than about 50% of a total area of the shaped working surface.
6. The cutter of claim 1, wherein the shaped working surface comprises a high point and a low point in an axial direction and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction and halfway between the high point and the low point, has a perimeter length that is greater than about 50% of a perimeter of the shaped working surface.
7. The cutter of claim 1, wherein the shaped working surface comprises a relative high point inward from a peripheral edge of the cutter, the relative high point defined by a convex curved surface portion that continues to the peripheral edge of the cutter.
8. The cutter of claim 1, wherein the shaped working surface comprises a relative high point inward from a peripheral edge of the cutter, the relative high point defined by a convex curved surface portion that is connected to the peripheral edge of the cutter with a concave curved surface.
9. The cutter of claim 1, wherein the shaped working surface comprises at least two relative high points.
10. The cutter of claim 1, wherein the shaped working surface comprises:
a first relative high point inward from a peripheral edge of the cutter, the first relative high point defined by a first convex curved surface portion;
a second relative high point inward from the peripheral edge of the cutter, the second relative high point defined by a second convex curved surface portion; and a concave curved surface portion connecting between the first and second convex curved surface portions.
11. The cutter of claim 1, wherein the shaped working surface comprises:
a first relative high point inward from a peripheral edge of the cutter, the first relative high point defined by a first convex curved surface portion that continues to the peripheral edge of the cutter;
a second relative high point inward from the peripheral edge of the cutter, the second relative high point defined by a second convex curved surface portion; and a concave curved surface portion connecting between the first and second convex curved surface portions.
12. The cutter of claim 1, wherein the shaped working surface comprises:
a first relative high point inward from a peripheral edge of the cutter, the first relative high point defined by a first convex curved surface portion that is connected to the peripheral edge of the cutter with a concave curved surface;
a second relative high point inward from the peripheral edge of the cutter, the second relative high point defined by a second convex curved surface portion; and a concave curved surface portion connecting between the first and second convex curved surface portions.
13. The cutter of claim 1, wherein the shaped working surface comprises:
a first relative high point inward from a peripheral edge of the cutter, the first relative high point defined by a first convex curved surface portion;
a second relative high point inward from the peripheral edge of the cutter, the second relative high point defined by a flat surface portion; and a concave curved surface portion connecting between the first convex curved surface portion and the flat surface portion that defines the second relative high point..
14. A cutter comprising:
a shaped working surface, wherein the shaped working surface comprises a high point and a low point in an axial direction and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction and halfway between the high point and the low point, has an area that is greater than about 20% of a total area of the shaped working surface.
15. A cutter comprising:
a shaped working surface, wherein the shaped working surface comprises a high point and a low point in an axial direction and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction and halfway between the high point and the low point, has a perimeter length that is greater than about 20% of the perimeter of the shaped working surface.
16. A cutter comprising:
a shaped working surface, wherein the shaped working surface comprises at least two relative high points.
17. A cutter comprising:
a shaped working surface, wherein the shaped working surface includes:
a first relative high point inward from a peripheral edge of the cutter, the first relative high point defined by a first convex curved surface portion;
a second relative high point inward from the peripheral edge of the cutter, the second relative high point defined by a second convex curved surface portion; and a concave curved surface portion connecting between the first and second convex curved surface portions.
18. A polycrystalline diamond compact (PDC) cutter comprising:
a shaped working surface;
a side surface; and a cutting edge between the working surface and the side surface, the shaped working surface including a concave portion from the edge inward and a convex portion at an inward location on the shaped working surface.
19. A cutter comprising:
a working surface of superhard material, including a top surface, a peripheral side surface, and an interface surface;
a cutting edge formed by an arcuate portion of a junction between the top surface and the peripheral side surface; and the top surface having:
a shaped working surface that is smooth and continuously curved, the shaped working surface further including:
a concave curved portion extending from the arcuate portion of the cutting edge inward on the top surface; and a convex curved portion defining a relative high point at an inward location on the top surface.
20. A cutter comprising:
a shaped working surface of superhard material attached to a substrate at an interface, the shaped working surface including a top surface, a peripheral side surface, and an interface surface;
a cutting edge formed by an arcuate portion of a junction between the top surface and the peripheral side surface; and the top surface being formed with a shaped surface that is smooth and continuously curved and defining a compound curve comprising a first concave portion extending inward from a first portion of a peripheral edge, a second concave portion extending inward from a second portion of the peripheral edge, and a convex portion interconnecting the first and second concave portions.
21. A drill bit comprising:
a bit body; and at least one cutter held by the bit body, the at least one cutter having an ultra hard shaped working surface, the shaped working surface including an axially asymmetrical curved surface.
22. The drill bit of claim 21 further comprising a plurality of cutters having ultra hard working surfaces selectively positioned on the bit body, wherein the shaped surface and the positions of the plurality of cutters produces a balance of forces on the drill bit during operation.
23. The drill bit of claim 21 further comprising a plurality of cutters having ultra hard working surfaces selectively positioned on the bit body, wherein the shaped surface and the positions of the plurality of cutters produces a net unbalanced force on the drill bit during operation.
24. The drill bit of claim 21 further comprising a plurality of cutters having ultra hard working surfaces selectively positioned on the bit body, wherein the shaped surface and the positions of the plurality of cutters produces a net unbalanced force on the drill bit during operation to facilitate directional drilling.
25. A drill bit comprising:
a bit body; and at least one cutter held by the bit body, the at least one cutter having an ultra hard shaped working surface, the shaped working surface including a high point and a low point in an axial direction of the cutter and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction of the cutter and halfway between the high point and the low point, has an area that is greater than about 20% of a total area of the shaped working surface.
26. A drill bit comprising:
a bit body; and at least one cutter held by the bit body, the at least one cutter having an ultra hard shaped working surface, the shaped working surface including a high point and a low point in an axial direction of the cutter and wherein an imaginary cross-section, taken through the shaped working surface perpendicular to the axial direction of the cutter and halfway between the high point and the low point, has a perimeter length that is greater than about 20% of a total perimeter length of the shaped working surface.
27. A drill bit comprising:
a bit body; and at least one cutter held by the bit body, the at least one cutter having an ultra hard shaped working surface, the shaped working surface comprising an axially asymmetrical curved surface including a relative high point inward from a peripheral edge of the cutter, wherein the relative high point is defined by a convex curved surface portion that continues to the peripheral edge of the cutter.
28. A drill bit comprising:
a bit body;
a blade formed on the bit body; and a plurality of cutters held by the blade, at least one of the plurality of cutters having an ultra hard shaped working surface, the shaped working surface comprising an axially asymmetrical curved surface including a relative high point inward from a peripheral edge of the cutter, wherein the relative high point is defined by a convex curved surface portion that is connected to a peripheral edge of the cutter with a concave curved surface portion.
29. A drill bit comprising:
a bit body;
a blade formed on the bit body; and at least one cutter held by the blade, the at least one cutter having an ultra hard shaped working surface, the shaped working surface comprising at least two relative high points connected to each other with a substantially continuous smooth curved surface.
30. A drill bit comprising:

a bit body; and at least one cutter held by the bit body, the at least one cutter having an ultra hard working surface, the working surface including a varied curvature along a critical area of the working surface providing a varied effective back rake angle along a selected critical area of the cutter face.
31. The drill bit of claim 30 wherein the curvature of the working surface is varied base upon the intended position of the cutter on the drill bit, and to relatively increase the effective back rake angle in one critical area of the cutter face predicted to have a relatively large depth of cut at the interface with the formation and the curvature is varied to relatively reduce the effective back rake angle of the chamfer in another critical area of the cutter face predicted to have a relatively small depth of cut.
32. A drill bit comprising:

a bit body;

a blade formed on the bit body; and a plurality of cutters held by the blade, at least one of the plurality of cutters having an ultra hard shaped working surface with a varied curvature along at least a portion of the working surface providing a varied effective back rake angle along a selected critical area of the cutter face.
33. The drill bit of claim 32 wherein the varied curvature along at least a portion of the working surface of the cutter comprises varying the curvature to adjust the effective back rake angle for cutters based upon the position of the cutter on the blade in order to affect the resultant forces on the blade due to the effective back rake angle.
34. The drill bit of claim 32 wherein the varied curvature along at least a portion of the working surface of the cutter comprises varying the curvature to adjust the effective side rake angle for cutters based upon the position of the cutter on the blade in order to affect the resultant forces on the blade due to the effective side rake angle.
35. The drill bit of claim 32 wherein the varied curvature along at least a portion of the working surface of the cutter comprises varying the curvature to adjust the effective back rake angle on a plurality of cutters to adjust the effective back rake angle for selected cutters expected to have relatively deep cuts according to the placement of the cutter on the drill bit blade and to decrease the effective back rake angles for a plurality of cutters expected to have a relatively shallow depths of cut according to the placement of the cutters on the drill bit blade.
36. The drill bit of claim 32 wherein the varied curvature along at least a portion of the working surface of the cutter comprises a shaped working surface curvature on at least one of the plurality of cutters designed to control the total side forces on the drill bit so that the drill bit has pre-selected directional drilling characteristics.
37. The drill bit of claim 36 wherein the varied curvature along at least a portion of the working surface of the cutter comprises a shaped working surface curvature on a plurality of the cutters to control the total side forces on the drill bit so that the drill bit has a total side force consistent with pre-selected directional drilling characteristics.
CA2505710A 2004-04-30 2005-04-29 Shaped cutter surface Active CA2505710C (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US56675104P 2004-04-30 2004-04-30
US60/566,751 2004-04-30
US58430704P 2004-06-30 2004-06-30
US60/584,307 2004-06-30
US64886305P 2005-02-01 2005-02-01
US60/648,863 2005-02-01
US11/117,650 US7798257B2 (en) 2004-04-30 2005-04-28 Shaped cutter surface
US11/117,650 2005-04-28

Publications (2)

Publication Number Publication Date
CA2505710A1 true CA2505710A1 (en) 2005-10-30
CA2505710C CA2505710C (en) 2011-06-14

Family

ID=34682187

Family Applications (3)

Application Number Title Priority Date Filing Date
CA2505828A Active CA2505828C (en) 2004-04-30 2005-04-29 Modified cutters
CA2505710A Active CA2505710C (en) 2004-04-30 2005-04-29 Shaped cutter surface
CA2505709A Active CA2505709C (en) 2004-04-30 2005-04-29 Cutter having shaped working surface with varying edge chamfer

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA2505828A Active CA2505828C (en) 2004-04-30 2005-04-29 Modified cutters

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA2505709A Active CA2505709C (en) 2004-04-30 2005-04-29 Cutter having shaped working surface with varying edge chamfer

Country Status (3)

Country Link
US (2) US7726420B2 (en)
CA (3) CA2505828C (en)
GB (1) GB2424017B (en)

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CA2505709A1 (en) 2005-10-30
GB0609713D0 (en) 2006-06-28
CA2505828A1 (en) 2005-10-30
CA2505710C (en) 2011-06-14
GB2424017B (en) 2007-01-31
US20050247492A1 (en) 2005-11-10
CA2505828C (en) 2012-09-25
CA2505709C (en) 2011-09-13
US7726420B2 (en) 2010-06-01
US8037951B2 (en) 2011-10-18
US20110031030A1 (en) 2011-02-10

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