Special-shaped tooth and drill bit comprising same

Abstract

The special-shaped tooth comprises a base body and a special-shaped drilling layer arranged on the base body, the special-shaped tooth is of a columnar structure, the rear end of the special-shaped tooth is connected with the base body, and the front end of the special-shaped tooth is a drilling face; wherein a plurality of grooves are formed in the special-shaped drilling layer, and a chisel-shaped structure protruding outwards is formed on the drilling face. The drill bit comprises a drill bit body and the special-shaped teeth. The possibility that the side faces of the PDC teeth make contact with rock can be reduced, the area of the abrasion face of the PDC teeth is reduced, and therefore the purposes that the ability of the PDC teeth penetrating into the stratum is enhanced, rock debris is discharged, and the rock breaking efficiency of the drill bit is improved are achieved.

Description

Technical Field

[0001] This invention relates to a special-shaped tooth, belonging to the field of drilling tool technology. In addition, this invention also relates to a drill bit including the special-shaped tooth. Background Technology

[0002] PDC (polycrystalline diamond composite) teeth are cutting elements used in drilling tools, especially rock-breaking tools such as polycrystalline diamond composite drill bits (PDC drill bits), in drilling engineering. Figure 1 As shown, it is simply referred to as a composite sheet.

[0003] like Figure 2 As shown, the PDC tooth is composed of a polycrystalline diamond layer 1 and a matrix 2 (the matrix material is usually cemented carbide). The outer surface of the matrix 2 includes a side surface and a bottom surface. The side surface is usually cylindrical, but can also be an elliptical cylinder or other curved surfaces of revolution. The bottom surface is usually flat. The extremely high hardness of the polycrystalline diamond layer gives it excellent wear resistance. Simultaneously, because the hardness of the polycrystalline diamond layer is much higher than that of the matrix material, the wear rate of the polycrystalline diamond layer is lower than that of the matrix material during rock cutting, thus the PDC tooth has good self-sharpening properties. The outer end face of the polycrystalline diamond layer is the most important cutting surface on the composite material, hence it is called the cutting surface or drill face of the PDC tooth. The intersection of the working surface and the side surface of the PDC tooth is the cutting edge contour line of the PDC tooth (which is the contour line of the outer end face of the diamond layer when the chamfer of the working surface of the PDC tooth is ignored).

[0004] Rock-breaking tools such as PDC drill bits typically use multiple PDC teeth as cutting elements, with each composite piece connected to the drill body by welding or other methods. When the drill bit is drilling, multiple PDC teeth work simultaneously to cut the rock.

[0005] In actual drilling, in addition to the rotary drilling motion, the drill bit typically experiences various complex vibrations, and the morphology of the rock at the bottom of the well is also highly complex. Therefore, not only will the diamond working plane of each PDC tooth come into contact with the rock, but the sidewalls of the PDC teeth may also come into contact with the rock. Generally, contact between the sidewalls of the PDC teeth and the rock should be avoided as much as possible. This is because contact between the sidewalls of the PDC teeth and the rock reduces the effective working pressure on the working plane of the PDC tooth, thereby weakening the PDC tooth's ability to penetrate the rock.

[0006] On the other hand, as the drilling process continues, the PDC teeth wear down. The most typical wear pattern is the formation of a flat or near-flat area in the region where the PDC tooth contacts the rock; this area is generally referred to as the wear surface or wear plane of the PDC tooth. As the wear surface of the PDC tooth forms and expands, its area gradually increases, and more and more drilling pressure is borne by the wear surface of the PDC tooth. The effective drilling pressure acting on the PDC tooth for rock breaking becomes smaller and smaller, and its ability to penetrate the formation becomes increasingly poor.

[0007] Traditional chisel-shaped cutting teeth often encounter problems of low cutting efficiency and rapid wear when dealing with hard rock formations. Therefore, a new chisel-shaped cutting tooth design is needed to improve the performance of PDC drill bits. Summary of the Invention

[0008] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes a novel irregular tooth for use in PDC drill bits. It can reduce the possibility of the PDC tooth side contacting the rock and reduce the area of ​​the PDC tooth wear surface, thereby enhancing the ability of the PDC tooth to penetrate the formation, removing rock cuttings, and improving the rock breaking efficiency of the drill bit.

[0009] This invention proposes a non-circular tooth, comprising: Matrix, and The irregularly shaped drill layer is disposed on the substrate, and the irregular shape is transformed into a columnar structure with its rear end connected to the substrate and its front end being the drill face; The irregularly shaped drill layer has several grooves, forming an outwardly protruding chisel-shaped structure on the drill surface.

[0010] A further improvement of the present invention is that the irregularly shaped diamond layer is a polycrystalline diamond layer.

[0011] A further improvement of the present invention is that the groove includes a first groove, a second groove, and a third groove; A first concave surface extending from the center to the edge is provided on the drill surface of the irregularly shaped drill layer, and the first concave surface is inclined to form the first groove. A rectangular chisel face is provided on the side of the drill surface opposite to the first groove; The chisel face has a second concave surface and a third concave surface symmetrically arranged on both sides, forming the second groove and the third groove.

[0012] A further improvement of the present invention is that a fourth groove is provided on the side of the irregular tooth, the upper end of the fourth groove is connected to the second groove, and the lower end extends to the side of the substrate.

[0013] A further improvement of the present invention is that a fifth groove is provided on the side of the irregular tooth, the upper end of the fifth groove is connected to the third groove, and the lower end extends to the side of the substrate.

[0014] A further improvement of the present invention is that the fourth groove and the fifth groove are arranged symmetrically with respect to the central axis of the chisel surface.

[0015] A further improvement of the present invention is that the edges of the first groove, the second groove and the third groove are all provided with chamfers, and the edges of the chisel surface are also provided with chamfers.

[0016] A further improvement of the present invention is that the chamfer is a right-angle chamfer.

[0017] According to another aspect of the invention, a drill bit is also provided, comprising a drill bit body on which a plurality of the aforementioned irregular teeth are provided.

[0018] A further improvement of the present invention is that the irregular teeth are arranged in the direction of the drill bit drilling, and the irregular drill layer is oriented in the direction of the drill bit rotation.

[0019] Compared with the prior art, the advantages of the present invention are as follows: The irregular tooth of the present invention, when used in a PDC drill bit, can reduce the possibility of the PDC tooth side contacting the rock and reduce the area of ​​the PDC tooth wear surface, thereby enhancing the ability of the PDC tooth to penetrate the formation, expelling rock cuttings, and improving the rock breaking efficiency of the drill bit.

[0020] According to the drill bit of the present invention, the irregularly shaped teeth, when worn during rock cutting, reduce the bearing area of ​​the wear surface at the bottom of the irregularly shaped teeth, increasing the specific pressure on the rock interacting with the wear surface at the bottom of the irregularly shaped teeth. Simultaneously, the chisel-shaped teeth also enhance the ability of the composite blade to penetrate the formation, improving the rock-breaking efficiency of the drill bit. Furthermore, the unique chisel-shaped teeth increase the stress acting on the rock, promoting crack formation and propagation, and reducing drill bit vibration and vortex, thus stabilizing the drill bit and achieving efficient drilling. This design is suitable for hard formations and formations with alternating hard and soft surfaces. Attached Figure Description

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: Figure 1 The diagram shows the working state of the PDC tooth cutting rock. Figure 2 The diagram shown is a structural schematic of a conventional PDC tooth. Figure 3 The diagram shows the structure of a conventional PDC tooth after wear. Figure 4A schematic diagram of the wear surface formed after wear of a conventional PDC tooth; Figure 5 The diagram shown is a structural schematic of an irregularly shaped tooth according to an embodiment of the present invention; Figure 6 The diagram shown is a schematic representation of the structure of a non-circular tooth after wear, according to an embodiment of the present invention. Figure 7 The diagram shown is a wear surface of an irregularly shaped tooth according to an embodiment of the present invention. Figure 8 The image shown is a top view of the irregular tooth structure according to an embodiment of the present invention; Figure 9 The image shown is a front view of the irregular tooth structure according to an embodiment of the present invention; Figure 10 The image shown is a left view of the irregular tooth structure according to an embodiment of the present invention; Figure 11 The image shown is a right view of the irregular tooth structure according to an embodiment of the present invention; Figure 12 The image shown is a right view of the irregular tooth structure according to an embodiment of the present invention; Figure 13 The diagram shown is a schematic representation of the structure of a drill bit according to an embodiment of the present invention. The accompanying drawings are not drawn to scale.

[0022] The meanings of the reference numerals in the attached figures are as follows: 1. Matrix, 2. Irregular drill layer, 3. Drill bit body, 4. First groove, 5. Second groove, 6. Third groove, 7. Chisel face, 8. Chamfer, 9. Fourth groove, 10. Fifth groove, 11. Conventional wear surface, 12. Irregular tooth wear surface. Detailed Implementation

[0023] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0024] In existing technologies, such as Figure 2As shown, the PDC tooth is composed of a polycrystalline diamond layer 1 and a matrix 2 (the matrix material is usually cemented carbide). The outer surface of the matrix 2 includes a side surface and a bottom surface. The side surface is usually cylindrical, but can also be an elliptical cylinder or other curved surfaces of revolution. The bottom surface is usually flat. The extremely high hardness of the polycrystalline diamond layer gives it excellent wear resistance. Simultaneously, because the hardness of the polycrystalline diamond layer is much higher than that of the matrix material, the wear rate of the polycrystalline diamond layer is lower than that of the matrix material during rock cutting, thus the PDC tooth has good self-sharpening properties. The outer end face of the polycrystalline diamond layer is the most important cutting surface on the composite material, hence it is called the cutting surface or drill face of the PDC tooth. The intersection of the working surface and the side surface of the PDC tooth is the cutting edge contour line of the PDC tooth (which is the contour line of the outer end face of the diamond layer when the chamfer of the working surface of the PDC tooth is ignored).

[0025] Rock-breaking tools such as PDC drill bits typically use multiple PDC teeth as cutting elements, with each composite piece connected to the drill body by welding or other methods. When the drill bit is drilling, multiple PDC teeth work simultaneously to cut the rock.

[0026] In actual drilling, in addition to the rotary drilling motion, the drill bit typically experiences various complex vibrations, and the morphology of the rock at the bottom of the well is also highly complex. Therefore, not only will the diamond working plane of each PDC tooth come into contact with the rock, but the sidewalls of the PDC teeth may also come into contact with the rock. Generally, contact between the sidewalls of the PDC teeth and the rock should be avoided as much as possible. This is because contact between the sidewalls of the PDC teeth and the rock reduces the effective working pressure on the working plane of the PDC tooth, thereby weakening the PDC tooth's ability to penetrate the rock.

[0027] On the other hand, as the drilling process continues, the PDC teeth wear down. The most typical wear pattern is that a flat or near-flat area is worn away in the region where the PDC tooth contacts the rock; this area is generally referred to as the wear surface or wear plane of the PDC tooth (e.g., ...). Figure 3 and Figure 4 (As shown). As the PDC tooth wear surface forms and expands, the area of ​​the wear surface gradually increases, and more and more drilling pressure is borne by the wear surface of the PDC tooth. The effective drilling pressure acting on the PDC tooth for rock breaking becomes smaller and smaller, and the ability to penetrate the formation becomes worse and worse.

[0028] Traditional chisel-shaped cutting teeth often encounter problems of low cutting efficiency and rapid wear when dealing with hard rock formations. Therefore, a new chisel-shaped cutting tooth design is needed to improve the performance of PDC drill bits.

[0029] To address the aforementioned issues, this invention proposes a uniquely shaped tooth for use in PDC drill bits. This tooth reduces the likelihood of contact between the PDC tooth's side surface and the rock, and also reduces the area of ​​the PDC tooth's wear surface. This enhances the PDC tooth's ability to penetrate the formation, removes rock cuttings, and improves the drill bit's rock-breaking efficiency.

[0030] In such Figure 5 In the illustrated embodiment, an irregularly shaped tooth includes: Matrix 1, The irregularly shaped drill layer is disposed on the substrate 1. The irregularly shaped drill layer is a columnar structure with its rear end connected to the substrate 1 and its front end being a drill face. The irregularly shaped drill layer has several grooves on its drill surface.

[0031] In one embodiment, the irregular diamond layer is a polycrystalline diamond layer.

[0032] Polycrystalline diamond layers can improve the hardness and strength of irregularly shaped drill layers, thereby enhancing cutting performance.

[0033] In one embodiment, the groove includes a first groove 4, a second groove 5, and a third groove 6. A first concave surface is provided on the drill surface of the irregular drill layer. The first concave surface is inclined from the middle of the drill surface along the edge to form a first groove 4. A chisel surface 7 is formed on the side opposite to the first concave surface. The chisel surface 7 is a rectangular surface. A second concave surface and a third concave surface are respectively provided on both sides of the chisel surface 7. The second concave surface and the third concave surface extend inclinedly from the chisel surface 7 to the edge of the drill surface to form a second groove 5 and a third groove 6.

[0034] In the irregular-shaped tooth according to this embodiment, the drill face forms a protruding chisel face 7 by setting a first groove 4, a second groove 5 and a third groove 6. The three grooves reduce the probability of the side of the base 1 contacting the rock, and the formed chip removal channel is more conducive to chip removal, prevents rock cuttings from accumulating, increases effective working drilling pressure, enhances the cutting effect, and improves the rock breaking efficiency of the drill bit.

[0035] In this embodiment, the second groove 5 and the third groove 6 are symmetrically arranged with respect to the chisel surface 7. A connecting edge is formed between the first groove 4 and the second groove 5, while the second groove 5 and the third groove 6 are separated and spaced apart by the chisel surface 7.

[0036] In the irregular-shaped teeth described in this embodiment, when the composite piece is damaged during rock cutting, the three grooves can reduce the bearing area of ​​the composite piece's wear surface and increase the specific pressure on the rock interacting with the wear surface of the composite piece. This is beneficial for enhancing the composite piece's ability to penetrate the formation. Simultaneously, the chisel face 7 also further enhances the composite piece's ability to penetrate the formation, improving the drill bit's rock-breaking efficiency (e.g., ...). Figure 6 and Figure 7 (As shown).

[0037] In this embodiment, the three grooves increase the surface area of ​​the exposed portion of the irregular teeth, which helps to improve the cooling effect of the irregular teeth and enhance their resistance to thermal wear.

[0038] In this embodiment, the unique chisel shape enhances the stress acting on the rock, which helps to generate and extend cracks, and can reduce drill bit vibration and vortex, which helps to stabilize the drill bit and achieve efficient drilling. It is suitable for hard formations and formations with alternating soft and hard surfaces.

[0039] In one embodiment, such as Figures 8-12 As shown, the side of the irregular tooth is also provided with a fourth groove 9 and a fifth groove 10. The fourth groove 9 extends from the second groove 5 to the base 1, and the fifth groove 10 extends from the third groove 6 to the base 1. The fourth groove 9 and the fifth groove 10 are not connected.

[0040] The fourth groove 9 and the fifth groove 10 are arranged symmetrically with respect to the central axis of the chisel surface 7.

[0041] In the irregularly shaped teeth according to this embodiment, the portion of the substrate 1 disposed between the grooves on the side can provide support for the diamond layer. This helps to reduce the weakening effect on the strength and stiffness of the composite sheet caused by the grooving. In one embodiment, the edges of the first groove 4, the second groove 5, and the third groove 6 are all provided with chamfers 8, and the edge of the chisel surface 7 is also provided with chamfers 8. Preferably, the chamfer 8 is a right-angle chamfer 8.

[0042] In another aspect of the invention, a drill bit is also provided, such as Figure 13 As shown, it includes a drill bit body 3, on which a plurality of irregularly shaped teeth are provided.

[0043] The irregular teeth are arranged in the direction of the drill bit drilling, and the irregular drill layer is oriented in the direction of the drill bit rotation.

[0044] Preferably, the drill bit is provided with a plurality of protruding structures, and the irregular teeth are provided on the side of the protruding structures, facing the direction of rotation of the drill bit.

[0045] The following is a detailed explanation using specific examples.

[0046] Example 1 A novel irregular tooth comprises an irregular diamond layer formed by a polycrystalline diamond layer and a matrix 1 composite therewith, and the irregular tooth is provided with a first groove 4, a second groove 5 and a third groove 6.

[0047] The first groove 4 is connected to the second groove 5 and the third groove 6 by an inclined surface. A chisel surface 7 is formed between the second groove 5 and the third groove 6.

[0048] Two fourth grooves 9 and a fifth groove 10 are also opened on the irregular tooth side surface. Six chamfers 8 are provided at the junction of the bottom and side surfaces of the polycrystalline diamond layer, forming a chisel-shaped structure on the bottom surface of the polycrystalline diamond layer.

[0049] The first groove 4, the second groove 5, and the third groove 6 are arranged clockwise around the chisel on the bottom surface of the polycrystalline diamond layer.

[0050] The intersection lines of the curved surfaces of the first groove 4, the second groove 5, and the third groove 6 with the outer surface of the irregular tooth are all located on the bottom surface of the polycrystalline diamond layer, and three of these intersection lines coincide with the three intersection lines of the chisel and the bottom surface of the polycrystalline diamond layer.

[0051] The intersection of the curved surfaces of the fourth groove 9 and the fifth groove 10 with the outer surface of the irregular tooth is partly located on the side of the substrate 1 and partly located on the side of the polycrystalline diamond layer. A chamfer 8 is provided between the second groove 5 and the fourth groove 9, and a chamfer 8 is provided between the third groove 6 and the fifth groove 10.

[0052] The first groove 4 is located on the bottom surface of the polycrystalline diamond layer and is situated between the second groove 5 and the third groove 6, connecting with the chisel. The first groove 4 and the second groove 5 and the third groove 6 each have a coincident line.

[0053] The second groove 5 and the third groove 6 are spatially mirror-symmetric structures of each other, and the plane of symmetry is a plane passing through the center line of the chisel surface 7.

[0054] The fourth groove 9 and the fifth groove 10 are spatially mirror-symmetric structures, with the symmetry plane being a plane passing through the center line of the chisel surface 7.

[0055] The structures of the fourth groove 9 and the fifth groove 10 are independent of each other and are unrelated.

[0056] The outer side of the first groove 4 is provided with a first chamfer 8, the outer side of the second groove 5 is provided with a second chamfer 8, the outer side of the third groove 6 is provided with a third chamfer 8, and the outer side of the chisel surface 7 is provided with a fourth chamfer 8.

[0057] When the irregular tooth is located on the drill bit body, the grooves on the sides of its base 1 and polycrystalline diamond layer are fully exposed. The intersection lines of the curved surfaces forming the grooves with the outer surface of the irregular tooth are all located on the sides of the base 1 and the polycrystalline diamond layer. The two grooves are either symmetrical or asymmetrical. The three grooves on the bottom surface of its polycrystalline diamond layer are arranged clockwise around the chisel on the bottom surface of the irregular tooth. The intersection lines of the curved surfaces forming the grooves with the bottom surface of the irregular tooth are all located on the bottom surface of the polycrystalline diamond layer. The two grooves on the sides of its base 1 and the polycrystalline diamond layer are symmetrically arranged transversely on the irregular tooth.

[0058] Example 2 A drill bit includes a drill bit body 3, on which a plurality of irregularly shaped teeth are provided.

[0059] The drill bit body is equipped with four sets of protruding structures, with irregularly shaped teeth arranged on the sides of the protruding structures.

[0060] The irregular teeth are arranged in the direction of the drill bit drilling, and the irregular drill layer is oriented in the direction of the drill bit rotation.

[0061] Preferably, the drill bit is provided with a plurality of protruding structures, and the irregular teeth are provided on the side of the protruding structures, facing the direction of rotation of the drill bit.

[0062] The irregular teeth here include an irregular diamond layer formed by polycrystalline diamond and a matrix 1 composite therewith, and a first groove 4, a second groove 5 and a third groove 6 are provided on the irregular teeth.

[0063] The first groove 4 is connected to the second groove 5 and the third groove 6 by an inclined surface. A chisel surface 7 is formed between the second groove 5 and the third groove 6.

[0064] Two fourth grooves 9 and a fifth groove 10 are also opened on the irregular tooth side surface. Six chamfers 8 are provided at the junction of the bottom and side surfaces of the polycrystalline diamond layer, forming a chisel-shaped structure on the bottom surface of the polycrystalline diamond layer.

[0065] The first groove 4, the second groove 5, and the third groove 6 are arranged clockwise around the chisel on the bottom surface of the polycrystalline diamond layer.

[0066] The intersection lines of the curved surfaces of the first groove 4, the second groove 5, and the third groove 6 with the outer surface of the irregular tooth are all located on the bottom surface of the polycrystalline diamond layer, and three of these intersection lines coincide with the three intersection lines of the chisel and the bottom surface of the polycrystalline diamond layer.

[0067] The intersection of the curved surfaces of the fourth groove 9 and the fifth groove 10 with the outer surface of the irregular tooth is partly located on the side of the substrate 1 and partly located on the side of the polycrystalline diamond layer. A chamfer 8 is provided between the second groove 5 and the fourth groove 9, and a chamfer 8 is provided between the third groove 6 and the fifth groove 10.

[0068] The first groove 4 is located on the bottom surface of the polycrystalline diamond layer and is situated between the second groove 5 and the third groove 6, connecting with the chisel. The first groove 4 and the second groove 5 and the third groove 6 each have a coincident line.

[0069] The second groove 5 and the third groove 6 are spatially mirror-symmetric structures of each other, and the plane of symmetry is a plane passing through the center line of the chisel surface 7.

[0070] The fourth groove 9 and the fifth groove 10 are spatially mirror-symmetric structures, with the symmetry plane being a plane passing through the center line of the chisel surface 7.

[0071] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0072] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0074] Certain terms are used throughout this application to refer to specific system components. As those skilled in the art will recognize, the same components may often be referred to by different names, and therefore this application is not intended to distinguish components that differ only in name and not in function. The terms "an embodiment" or "embodiment" used in the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "embodiment" appearing throughout the specification does not necessarily refer to the same embodiment.

[0075] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0076] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the invention, and all changes and / or modifications made according to embodiments of the invention should be covered within the protection scope of the invention.

Claims

1. A type of irregular tooth, characterized in that, include: Matrix (1), and The irregularly shaped drill layer is disposed on the substrate (1), the irregular shape is transformed into a columnar structure, the rear end of which is connected to the substrate (1), and the front end is the drill surface; The irregularly shaped drill layer has several grooves, forming an outwardly protruding chisel-shaped structure on the drill surface.

2. The irregular tooth according to claim 1, characterized in that, The irregularly shaped diamond layer is a polycrystalline diamond layer.

3. The irregularly shaped tooth according to claim 2, characterized in that, The groove includes a first groove (4), a second groove (5) and a third groove (6); A first concave surface extending from the middle to the edge is provided on the drill surface of the irregular drill layer, and the first concave surface is inclined to form the first groove (4). A rectangular chisel face (7) is provided on the side of the drill surface opposite to the first groove (4); The chisel surface (7) has a second concave surface and a third concave surface symmetrically arranged on both sides to form the second groove (5) and the third groove (6).

4. The irregularly shaped tooth according to claim 3, characterized in that, The side of the irregular tooth is provided with a fourth groove (9), the upper end of the fourth groove (9) is connected to the second groove (5), and the lower end extends to the side of the base (1).

5. The irregularly shaped tooth according to claim 4, characterized in that, The side of the irregular tooth is provided with a fifth groove (10), the upper end of the fifth groove (10) is connected to the third groove (6), and the lower end extends to the side of the base (1).

6. The irregularly shaped tooth according to claim 5, characterized in that, The fourth groove (9) and the fifth groove (10) are arranged symmetrically with respect to the central axis of the chisel face (7).

7. The irregular tooth according to claim 6, characterized in that, The edges of the first groove (4), the second groove (5) and the third groove (6) are all provided with chamfers (8), and the edge of the chisel surface (7) is provided with chamfers (8).

8. The irregular tooth according to claim 7, characterized in that, The chamfer (8) is a right-angle chamfer (8).

9. A drill bit, comprising a drill bit body (3), characterized in that, The drill bit body (3) is provided with a plurality of irregular teeth according to any one of claims 1 to 8.

10. The drill bit according to claim 9, characterized in that, The irregular teeth are arranged in the direction of the drill bit drilling, and the irregular drill layer is oriented in the direction of the drill bit rotation.

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