CA2690519A1 - Ploughing wedge insert for drag drill bit - Google Patents
Ploughing wedge insert for drag drill bit Download PDFInfo
- Publication number
- CA2690519A1 CA2690519A1 CA 2690519 CA2690519A CA2690519A1 CA 2690519 A1 CA2690519 A1 CA 2690519A1 CA 2690519 CA2690519 CA 2690519 CA 2690519 A CA2690519 A CA 2690519A CA 2690519 A1 CA2690519 A1 CA 2690519A1
- Authority
- CA
- Canada
- Prior art keywords
- arris
- wedge
- cutter
- drill bit
- sloping sides
- 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.)
- Abandoned
Links
Landscapes
- Earth Drilling (AREA)
Abstract
A wedge shaped cutter insert for a drag type drill bit head having a cutting face comprising: an elongate body having a drill bit head insertion end portion and an opposite cutting end portion; and, a wedge extending from and above the cutting end portion, said wedge having an arris extending centrally across the end portion of the elongate body and opposite sloping sides extending up and back from the arris. In use the arris on the cutter insert is oriented in the cutting face of the drag type cutter bit head generally perpendicular to the direction of cut so that a generally triangular face, with the arris pointing downwardly, ploughs into a formation. A drag type drill bit head comprises: a cutter insert as described above; said cutter insert having the arris of the wedge oriented perpendicularly to the direction of cut. A method of manufacturing a drag type drill bit head comprises the following steps:
a) providing a drag type drill bit head having cutter insert openings on its cutting face; b) providing cutter inserts as described above; c) matingly inserting and securing the cutter inserts in the cutter openings so that the arrises extend across the cutter inserts generally perpendicular to a direction of cut. In use, a generally triangular face, with the arris pointing downwardly, ploughs into the formation.
a) providing a drag type drill bit head having cutter insert openings on its cutting face; b) providing cutter inserts as described above; c) matingly inserting and securing the cutter inserts in the cutter openings so that the arrises extend across the cutter inserts generally perpendicular to a direction of cut. In use, a generally triangular face, with the arris pointing downwardly, ploughs into the formation.
Description
PLOUGHING WEDGE INSERT
FOR DRAG DRILL BIT
FIELD OF THE INVENTION
This invention relates to drag bits used to bore well holes. More particularly this invention relates to a drag bit insert having wedge shaped inserts which "plough" through a formation thereby yielding a higher rate of penetration with less applied torque.
BACKGROUND OF THE INVENTION
Wedge shaped drill bits are not new to the drilling industry. Wedges having a substantial face width have been used on the gauge, or side portion of drag type drill bits. US
Patent No. 6.170, 576 issued to D. J. Brunnert et al. discloses a drill bit in which a face of substantial width is moved tangentially against the side portion of an already cut hole. The wedges are not used for breaking or cutting. This specification discloses the use of a wedge used on the cutting face of a drill bit. Compared to the wedges mentioned above these wedges are generally turned 90 degrees so that the arris or top edge of the wedge is perpendicularly oriented to the cutting direction. The end of the wedge is an inverted triangle which is dragged across the bottom of the hole. Conventional drag bits generally present a face of substantial width which is pressed down and pushed forward into the rock. They effectively scrape away a thin top layer as each blade of the drill bit rotates on the rock below.
Herein a wedge is used on a peripheral edge of the blade on the drill bit. But the wedge is turned so that its end portion, in the shape of a downwardly pointed triangle is ploughed into the rock formation. The width of the wedge follows the triangular side or end portion, so that the downward point of the triangle is buffered and supported by the following width of the triangular wedge. The bottom of the hole is effectively ploughed rather than scrapped. As one might expect, dragging the pointed end of the wedge across the formation requires less torque. And not unexpectedly, the point of the triangular face applies a higher rock breaking pressure, which radiates outwardly therefrom in multiple directions, and which results in a higher penetration rate, than dragging across the formation, generally applying the same force across a greater width effectively applying force in a single direction.
OBJECTS OF THE INVENTION
It is an object of this invention to disclose a more effective drag type drill bit. A drill bit which "ploughs" into the formation, with less torque, and with higher pressure on the point of the triangle, resulting in a higher penetration rate. Due to the radiating dispersal of applied forces in the formation, there is a greater chip and penetration rate with less weight on the bit and less torque. It is an object of this invention to disclose an insert for the face of a drill bit which employs an end portion of a wedge to cut into a formation. It is yet a further object of this invention to disclose a method of drilling a using a drag type drill bit having a wedge type cutter, positioned in the face of a blade thereof, so that the end portion of the wedge is used to "plough" into the formation.
One aspect of this invention provides for a wedge shaped cutter insert for a drag type drill bit head having a cutting face comprising: an elongate body having a drill bit head insertion end portion and an opposite cutting end portion; and, a wedge extending from and above the cutting end portion, said wedge having an arris extending centrally across the end portion of the elongate body and opposite sloping sides extending up and back from the arris.
In use the arris on the cutter insert is oriented in the cutting face of the drag type cutter head generally perpendiculary to the direction of cut so that a generally triangular face, with the arris pointing downwardly, ploughs into the formation.
A method of manufacturing a drag type drill bit head comprises the following steps:
a) providing a drag type drill bit having cutter insert openings on its cutting face; b) providing cutter inserts as described above; c) matingly inserting and securing the cutter inserts in the cutter openings so that the arrises extend across the cutter inserts generally perpendicular to a direction of cut. In use, a generally triangular face, with the arris pointing downwardly, ploughs into a formation.
Various other objects, advantages and features of this invention will become apparent to those skilled in the art from the following description in conjunction with the accompanying drawings.
FIGURES OF THE INVENTION
Figure 1 is a perspective view of a drill bit cutting head. The cutting faces of the drill bit cutting head have wedge cutters inserted therein each having the arris thereof turned perpendicularly to the direction of cut.
Figures 2 show views of the cutter insert shown in figure 1. The wedge is cut, ground, and/ or formed on a diamond layer of generally uniform thickness carried on an underlying carbide substrate. Figure 2s is a side view of the wedge cutter insert shown in figure 1, figure 2e is a end view of the wedge cutter insert shown in figure 1, and figure 2t is a top view of the cutter insert shown in figure 1.
Figures 3 show views of an alternative embodiment for the cutter insert.
Herein after the wedge is cut in a carbide substrate, a diamond layer of uniform thickness is used to cover the wedge. Figure 3s is a side view of the alternative embodiment for the wedge cutter insert, figure 3e is a end view of the alternative embodiment for the wedge cutter insert, and figure 3t is a top view of the alternative embodiment for the cutter insert.
The following is a discussion and description of the preferred specific embodiments of this invention, such being made with reference to the drawings, wherein the same reference numerals are used to indicate the same or similar parts and/or structure. It should be noted that such discussion and description is not meant to unduly limit the scope of the invention.
DESCRIPTION OF THE INVENTION
Turning now to the drawings and more particularly to figure 1 we have a perspective view of a drag type drill bit cutting head 20. The cutting faces 22 of the drill bit cutting head 20 have wedge cutters inserts 30 inserted therein each having an arris 32 turned perpendicularly to the direction of cut 18. Most generally a wedge shaped cutter insert 30 for a drag type drill bit cutting head 20 having a cutting face 22 comprises: a) an elongate body having a drill bit head insertion end portion and an opposite cutting end portion; and, b) a wedge 34 extending from and above the cutting end portion, said wedge 34 having an arris 32 extending centrally across the end portion of the elongate body and opposite sloping sides 36 extending up and back from the arris 32. In use the arris 32 on the cutter insert 30 is oriented in the cutting head 20 so that the the arris 32 of the cutting insert is generally perpendicular to the direction of cut so that a generally triangular face 38, with the arris pointing downwardly, ploughs into a formation. In the most preferred embodiment of the invention the insert 30 is cylindrical and wherein opposite sloping sides 36 slope up and back from the central arris 32 at the same angle k.
In one aspect of the invention the sloping sides 36 comprise straight lines.
In another aspect of the invention the sloping sides 36 comprise a convex outward curvature to disperse forces and thereby increase impact resistance and reduce breakage. Within this specification arris is intended and defined to include the top portion between the two sloping sides 36. This definition is intended to include not only a ridge line formed by the meeting of the sloping sides 36, but also a top portion which is flattened between the sloping sides 36 (as shown on figures 3t), and additionally even a rounded top portion having a convex curvature. For example when the sloping sides 36 each have a convex curvature, and the portion between the convex sides also has a convex curvature, so that the wedge 34, as viewed from the cutting end appears dome shaped, then the arris within this specification would be the top portion between the convex curved sides 36, itself having a convex curvature.
Figures 2 shows views of the cutter insert 30 shown in figure 1. The wedge 34 is cut and/ or ground on a diamond layer 40 of generally uniform thickness carried on an underlying carbide substrate 42. Figure 2s is a side view of the wedge cutter insert shown in figure 1, figure 2e is a end view of the wedge cutter insert shown in figure 1, and figure 2t is a top view of the cutter insert shown in figure 1. Most preferably the insert 30 is cylindrical and opposite sloping sides 36 slope up and back from the central arris 32 at the same angle a.
The angles of slope as measured between the sloping sides 36 and a line extending laterally through the arris 32 are between 3 and 45 degrees. More preferably, the angles of slope a as measured between the sloping sides 36 and the line p extending laterally through the arris are between 8 and 15 degrees. Generally, the sloping sides comprise straight lines. The sloping sides 36 may however comprise a convex outward curvature to prevent breakage (see figure 3e).
As shown in figures 2 the wedge 34 may be cut and/or ground on a diamond layer of generally uniform thickness seated on a generally planar underlying carbide substrate 42.
Figures 3 show views of an alternative embodiment for the cutter insert 30.
Herein after the wedge 34 is cut in a carbide substrate 42, and a diamond layer 42 of uniform thickness is used to cover the wedge 34. Figure 3s is a side view of the alternative embodiment for the wedge cutter insert 30, figure 3e is a end view of the alternative embodiment for the wedge cutter insert 30, and figure 3t is a top view of the alternative embodiment for the cutter insert 30.
Alternatively, as shown in figures 3 the fabrication of the cutting end portion of the elongate body may first comprise a wedge shape 38. Subsequently, a diamond layer 40 of generally uniform thickness can be formed on the wedge shape 38.
Within this specification a diamond layer is defined and intended to include a polycrystalline diamond layer as well as any other very hard wear resistant cutting layer.
Similarly a carbide substrate is intended and defined to include not only a carbide underlying layer, but additionally any other layer positioned under a very hard wear resistant cutting layer. A generally planar underlying substrate is intended and defined to include any generally flat underlying layer which has been altered to provide better adhesion of a very hard top layer.
Most generally, a method of manufacturing a drill bit cutting head 20 comprises the steps of: a) providing a drag type drill bit head 20 having cutter insert openings 31 on its cutting face 22; b) providing cutter inserts 30 as described above; c) matingly inserting and securing the cutter inserts 30 in the cutter insert openings 31 so that the arrises 32 extend across the cutter inserts 30 generally perpendicular to a direction of cut 18.
In use, a generally triangular face 38, with the arris pointing downwardly, ploughs into a formation. This general method may be narrowed with limitations which limit the most general drag type cutter insert 30 described above.
Most generally a drag type drill bit head comprises: a cutter insert 30 as described above; said cutter insert 30 having the arris 32 of the wedge 38 oriented perpendicularly to the direction of cut 18. Usually, the cutter insert 30 is positioned on the cutting face 22 of the drill bit head 20. Most preferably, the insert 30 is cylindrical and opposite sloping sides 36 slope up and back from the central arris 32 at the same angle .
While the invention has been described with preferred specific embodiments thereof, it will be understood that this description is intended to illustrate and not to limit the scope of the invention, which is defined by the following claims.
FOR DRAG DRILL BIT
FIELD OF THE INVENTION
This invention relates to drag bits used to bore well holes. More particularly this invention relates to a drag bit insert having wedge shaped inserts which "plough" through a formation thereby yielding a higher rate of penetration with less applied torque.
BACKGROUND OF THE INVENTION
Wedge shaped drill bits are not new to the drilling industry. Wedges having a substantial face width have been used on the gauge, or side portion of drag type drill bits. US
Patent No. 6.170, 576 issued to D. J. Brunnert et al. discloses a drill bit in which a face of substantial width is moved tangentially against the side portion of an already cut hole. The wedges are not used for breaking or cutting. This specification discloses the use of a wedge used on the cutting face of a drill bit. Compared to the wedges mentioned above these wedges are generally turned 90 degrees so that the arris or top edge of the wedge is perpendicularly oriented to the cutting direction. The end of the wedge is an inverted triangle which is dragged across the bottom of the hole. Conventional drag bits generally present a face of substantial width which is pressed down and pushed forward into the rock. They effectively scrape away a thin top layer as each blade of the drill bit rotates on the rock below.
Herein a wedge is used on a peripheral edge of the blade on the drill bit. But the wedge is turned so that its end portion, in the shape of a downwardly pointed triangle is ploughed into the rock formation. The width of the wedge follows the triangular side or end portion, so that the downward point of the triangle is buffered and supported by the following width of the triangular wedge. The bottom of the hole is effectively ploughed rather than scrapped. As one might expect, dragging the pointed end of the wedge across the formation requires less torque. And not unexpectedly, the point of the triangular face applies a higher rock breaking pressure, which radiates outwardly therefrom in multiple directions, and which results in a higher penetration rate, than dragging across the formation, generally applying the same force across a greater width effectively applying force in a single direction.
OBJECTS OF THE INVENTION
It is an object of this invention to disclose a more effective drag type drill bit. A drill bit which "ploughs" into the formation, with less torque, and with higher pressure on the point of the triangle, resulting in a higher penetration rate. Due to the radiating dispersal of applied forces in the formation, there is a greater chip and penetration rate with less weight on the bit and less torque. It is an object of this invention to disclose an insert for the face of a drill bit which employs an end portion of a wedge to cut into a formation. It is yet a further object of this invention to disclose a method of drilling a using a drag type drill bit having a wedge type cutter, positioned in the face of a blade thereof, so that the end portion of the wedge is used to "plough" into the formation.
One aspect of this invention provides for a wedge shaped cutter insert for a drag type drill bit head having a cutting face comprising: an elongate body having a drill bit head insertion end portion and an opposite cutting end portion; and, a wedge extending from and above the cutting end portion, said wedge having an arris extending centrally across the end portion of the elongate body and opposite sloping sides extending up and back from the arris.
In use the arris on the cutter insert is oriented in the cutting face of the drag type cutter head generally perpendiculary to the direction of cut so that a generally triangular face, with the arris pointing downwardly, ploughs into the formation.
A method of manufacturing a drag type drill bit head comprises the following steps:
a) providing a drag type drill bit having cutter insert openings on its cutting face; b) providing cutter inserts as described above; c) matingly inserting and securing the cutter inserts in the cutter openings so that the arrises extend across the cutter inserts generally perpendicular to a direction of cut. In use, a generally triangular face, with the arris pointing downwardly, ploughs into a formation.
Various other objects, advantages and features of this invention will become apparent to those skilled in the art from the following description in conjunction with the accompanying drawings.
FIGURES OF THE INVENTION
Figure 1 is a perspective view of a drill bit cutting head. The cutting faces of the drill bit cutting head have wedge cutters inserted therein each having the arris thereof turned perpendicularly to the direction of cut.
Figures 2 show views of the cutter insert shown in figure 1. The wedge is cut, ground, and/ or formed on a diamond layer of generally uniform thickness carried on an underlying carbide substrate. Figure 2s is a side view of the wedge cutter insert shown in figure 1, figure 2e is a end view of the wedge cutter insert shown in figure 1, and figure 2t is a top view of the cutter insert shown in figure 1.
Figures 3 show views of an alternative embodiment for the cutter insert.
Herein after the wedge is cut in a carbide substrate, a diamond layer of uniform thickness is used to cover the wedge. Figure 3s is a side view of the alternative embodiment for the wedge cutter insert, figure 3e is a end view of the alternative embodiment for the wedge cutter insert, and figure 3t is a top view of the alternative embodiment for the cutter insert.
The following is a discussion and description of the preferred specific embodiments of this invention, such being made with reference to the drawings, wherein the same reference numerals are used to indicate the same or similar parts and/or structure. It should be noted that such discussion and description is not meant to unduly limit the scope of the invention.
DESCRIPTION OF THE INVENTION
Turning now to the drawings and more particularly to figure 1 we have a perspective view of a drag type drill bit cutting head 20. The cutting faces 22 of the drill bit cutting head 20 have wedge cutters inserts 30 inserted therein each having an arris 32 turned perpendicularly to the direction of cut 18. Most generally a wedge shaped cutter insert 30 for a drag type drill bit cutting head 20 having a cutting face 22 comprises: a) an elongate body having a drill bit head insertion end portion and an opposite cutting end portion; and, b) a wedge 34 extending from and above the cutting end portion, said wedge 34 having an arris 32 extending centrally across the end portion of the elongate body and opposite sloping sides 36 extending up and back from the arris 32. In use the arris 32 on the cutter insert 30 is oriented in the cutting head 20 so that the the arris 32 of the cutting insert is generally perpendicular to the direction of cut so that a generally triangular face 38, with the arris pointing downwardly, ploughs into a formation. In the most preferred embodiment of the invention the insert 30 is cylindrical and wherein opposite sloping sides 36 slope up and back from the central arris 32 at the same angle k.
In one aspect of the invention the sloping sides 36 comprise straight lines.
In another aspect of the invention the sloping sides 36 comprise a convex outward curvature to disperse forces and thereby increase impact resistance and reduce breakage. Within this specification arris is intended and defined to include the top portion between the two sloping sides 36. This definition is intended to include not only a ridge line formed by the meeting of the sloping sides 36, but also a top portion which is flattened between the sloping sides 36 (as shown on figures 3t), and additionally even a rounded top portion having a convex curvature. For example when the sloping sides 36 each have a convex curvature, and the portion between the convex sides also has a convex curvature, so that the wedge 34, as viewed from the cutting end appears dome shaped, then the arris within this specification would be the top portion between the convex curved sides 36, itself having a convex curvature.
Figures 2 shows views of the cutter insert 30 shown in figure 1. The wedge 34 is cut and/ or ground on a diamond layer 40 of generally uniform thickness carried on an underlying carbide substrate 42. Figure 2s is a side view of the wedge cutter insert shown in figure 1, figure 2e is a end view of the wedge cutter insert shown in figure 1, and figure 2t is a top view of the cutter insert shown in figure 1. Most preferably the insert 30 is cylindrical and opposite sloping sides 36 slope up and back from the central arris 32 at the same angle a.
The angles of slope as measured between the sloping sides 36 and a line extending laterally through the arris 32 are between 3 and 45 degrees. More preferably, the angles of slope a as measured between the sloping sides 36 and the line p extending laterally through the arris are between 8 and 15 degrees. Generally, the sloping sides comprise straight lines. The sloping sides 36 may however comprise a convex outward curvature to prevent breakage (see figure 3e).
As shown in figures 2 the wedge 34 may be cut and/or ground on a diamond layer of generally uniform thickness seated on a generally planar underlying carbide substrate 42.
Figures 3 show views of an alternative embodiment for the cutter insert 30.
Herein after the wedge 34 is cut in a carbide substrate 42, and a diamond layer 42 of uniform thickness is used to cover the wedge 34. Figure 3s is a side view of the alternative embodiment for the wedge cutter insert 30, figure 3e is a end view of the alternative embodiment for the wedge cutter insert 30, and figure 3t is a top view of the alternative embodiment for the cutter insert 30.
Alternatively, as shown in figures 3 the fabrication of the cutting end portion of the elongate body may first comprise a wedge shape 38. Subsequently, a diamond layer 40 of generally uniform thickness can be formed on the wedge shape 38.
Within this specification a diamond layer is defined and intended to include a polycrystalline diamond layer as well as any other very hard wear resistant cutting layer.
Similarly a carbide substrate is intended and defined to include not only a carbide underlying layer, but additionally any other layer positioned under a very hard wear resistant cutting layer. A generally planar underlying substrate is intended and defined to include any generally flat underlying layer which has been altered to provide better adhesion of a very hard top layer.
Most generally, a method of manufacturing a drill bit cutting head 20 comprises the steps of: a) providing a drag type drill bit head 20 having cutter insert openings 31 on its cutting face 22; b) providing cutter inserts 30 as described above; c) matingly inserting and securing the cutter inserts 30 in the cutter insert openings 31 so that the arrises 32 extend across the cutter inserts 30 generally perpendicular to a direction of cut 18.
In use, a generally triangular face 38, with the arris pointing downwardly, ploughs into a formation. This general method may be narrowed with limitations which limit the most general drag type cutter insert 30 described above.
Most generally a drag type drill bit head comprises: a cutter insert 30 as described above; said cutter insert 30 having the arris 32 of the wedge 38 oriented perpendicularly to the direction of cut 18. Usually, the cutter insert 30 is positioned on the cutting face 22 of the drill bit head 20. Most preferably, the insert 30 is cylindrical and opposite sloping sides 36 slope up and back from the central arris 32 at the same angle .
While the invention has been described with preferred specific embodiments thereof, it will be understood that this description is intended to illustrate and not to limit the scope of the invention, which is defined by the following claims.
Claims (20)
1) A wedge shaped cutter insert for a drag type drill bit head having a cutting face comprising:
an elongate body having a drill bit head insertion end portion and an opposite cutting end portion;
a wedge extending from and above the cutting end portion, said wedge having an arris extending centrally across the end portion of the elongate body and opposite sloping sides extending up and back from the arris;
wherein use the arris on the cutter insert is oriented in the cutting face of the drag type cutting head generally perpendicular to the direction of cut so that a generally triangular face, with the arris pointing downwardly, ploughs into a formation.
an elongate body having a drill bit head insertion end portion and an opposite cutting end portion;
a wedge extending from and above the cutting end portion, said wedge having an arris extending centrally across the end portion of the elongate body and opposite sloping sides extending up and back from the arris;
wherein use the arris on the cutter insert is oriented in the cutting face of the drag type cutting head generally perpendicular to the direction of cut so that a generally triangular face, with the arris pointing downwardly, ploughs into a formation.
2) A wedge shaped cutter insert as in claim 1 wherein the insert is cylindrical and wherein opposite sloping sides slope up and back from the central arris at the same angle.
3) A wedge shaped cutter as in claim 2 wherein the angles of slope as measured between the sloping sides and a line extending laterally through the arris is between 3 and 45 degrees.
4) A wedge shaped cutter as in claim 3 wherein the angles of slope as measured between the sloping sides and the line extending laterally through the arris is between 8 and 15 degrees.
5) A wedge as in claim 2 wherein the sloping sides comprise straight lines.
6) A wedge shaped cutter as in claim 5 wherein the sloping sides comprise a convex outward curvature to disperse forces and thereby increase impact resistance and reduce breakage.
7) A wedge shaped cutter as in claim 2 wherein the wedge is cut, ground, and/
or formed in a diamond layer of generally uniform thickness seated on a generally planar underlying carbide substrate.
or formed in a diamond layer of generally uniform thickness seated on a generally planar underlying carbide substrate.
8) A wedge shaped cutter as in claim 2 wherein the fabrication of the cutting end portion of the elongate body comprises a carbide substrate in the shape of a wedge and subsequently a diamond layer of generally uniform thickness is formed on top of the wedge shape.
9) A method of manufacturing a drag type drill bit head comprises the following steps:
providing a drag type drill bit having cutter insert openings on its cutting face;
providing cutter inserts as described in claim 1;
matingly inserting and securing the cutter inserts in the cutter insert openings so that the arrises extend across the cutter inserts generally perpendicular to a direction of cut;
wherein use, a generally triangular face, with the arris pointing downwardly, ploughs into a formation.
providing a drag type drill bit having cutter insert openings on its cutting face;
providing cutter inserts as described in claim 1;
matingly inserting and securing the cutter inserts in the cutter insert openings so that the arrises extend across the cutter inserts generally perpendicular to a direction of cut;
wherein use, a generally triangular face, with the arris pointing downwardly, ploughs into a formation.
10) A method of drilling as in claim 9 wherein the insert is cylindrical and wherein opposite sloping sides slope up and back from the central arris at the same angle.
11) A method of drilling as in claim 9 wherein the angles of slope as measured between the sloping sides and a line extending laterally through the arris is between 3 and 45 degrees.
12) A method of drilling as in claim 9 wherein the angles of slope as measured between the sloping sides and the line extending laterally through the arris is between 8 and 15 degrees.
13) A method of drilling as in claim 9 wherein the sloping sides comprise straight lines.
14) A method of drilling as in claim 9 wherein sloping sides comprise a convex outward curvature to disperse forces and thereby increase impact resistance and reduce breakage.
15) A method of drilling as in claim 9 wherein sloping sides comprise a convex outward curvature to to disperse forces and thereby increase impact resistance and reduce breakage.
16) A method of drilling as in claim 9 wherein the wedge is cut and/ or ground on a diamond layer of generally uniform thickness on an underlying carbide substrate.
17) A method of drilling as in claim 9 wherein the fabrication the cutting end portion of the elongate body first comprises a wedge shape and whereafter a diamond layer of generally uniform thickness is formed on the wedge shape.
18) A drag type drill bit head comprising:
a cutter insert as described in claim 1;
said cutter insert having the arris of the wedge oriented perpendicularly to the direction of cut.
a cutter insert as described in claim 1;
said cutter insert having the arris of the wedge oriented perpendicularly to the direction of cut.
19) A drag type drill bit head as in claim 18 wherein the cutter insert is on the cutting face of the drill bit head.
20) A drag type drill bit head as in claim 19 wherein the cutter insert is cylindrical and opposite sloping sides slope up and back from the central arris at the same angle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US45476109A | 2009-05-26 | 2009-05-26 | |
| US12/454,761 | 2009-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2690519A1 true CA2690519A1 (en) | 2010-11-26 |
Family
ID=43242691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2690519 Abandoned CA2690519A1 (en) | 2009-05-26 | 2009-12-18 | Ploughing wedge insert for drag drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2690519A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108798529A (en) * | 2017-04-28 | 2018-11-13 | 中石化石油工程技术服务有限公司 | A kind of PDC drill bit suitable for stiff plastic stratum |
-
2009
- 2009-12-18 CA CA 2690519 patent/CA2690519A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108798529A (en) * | 2017-04-28 | 2018-11-13 | 中石化石油工程技术服务有限公司 | A kind of PDC drill bit suitable for stiff plastic stratum |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108291427B (en) | Fixed cutter drill bits having non-planar cutting elements thereon and other downhole tools | |
| EP0841463B1 (en) | Preform cutting element for rotary drill bits | |
| US6332503B1 (en) | Fixed cutter bit with chisel or vertical cutting elements | |
| US9574405B2 (en) | Hybrid disc bit with optimized PDC cutter placement | |
| US4570726A (en) | Curved contact portion on engaging elements for rotary type drag bits | |
| CA2456501C (en) | Multi-lobed cutter element for drill bit | |
| US5314033A (en) | Drill bit having combined positive and negative or neutral rake cutters | |
| US7896106B2 (en) | Rotary drag bits having a pilot cutter configuraton and method to pre-fracture subterranean formations therewith | |
| US4716977A (en) | Specially shaped cutting element for earth boring apparatus | |
| US4872520A (en) | Flat bottom drilling bit with polycrystalline cutters | |
| US6328117B1 (en) | Drill bit having a fluid course with chip breaker | |
| US9677343B2 (en) | Tracking shearing cutters on a fixed bladed drill bit with pointed cutting elements | |
| WO2010141579A4 (en) | Cutting elements including cutting tables with shaped faces configured to provide continuous effective positive back rake angeles, drill bits so equipped and methods of drilling | |
| EP0420262B1 (en) | Rotary drag bit including multi-element cutting structure | |
| ITTO970734A1 (en) | DRILLING DRILL WITH INTERNAL ROW ELEMENTS FOR FRACTURING CUTTING. | |
| US4907662A (en) | Rotary drill bit having improved mounting means for multiple cutting elements | |
| US11828108B2 (en) | Angled chisel insert | |
| US20080190670A1 (en) | Rotary drag bit with increased back rake angle gauge cutter | |
| USRE33757E (en) | Diamond drill bit with varied cutting elements | |
| US20100163310A1 (en) | Method of manufacturing and repairing fixed-cutter drag-type rotary tools with cutting control structures | |
| US20150285005A1 (en) | Rupture Cutters with High Penetration Utility | |
| EP3363988B1 (en) | Impregnated drill bit including a planar blade profile along drill bit face | |
| CA2690519A1 (en) | Ploughing wedge insert for drag drill bit | |
| EP3129577B1 (en) | Ultra-high rop blade enhancement | |
| RU2005126937A (en) | HEAD FOR DRILLING DEEP DEEP WELLS IN FROZEN SOILS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20151218 |