Micro spraying tooth and drill bit

Abstract

The utility model relates to a micro spraying tooth and a drill bit, the micro spraying tooth comprises a hard alloy matrix and a diamond composite layer, the diamond composite layer is arranged at one end of the hard alloy matrix, and at least one pointed cutting face is formed at the end of the diamond composite layer. The diamond composite layer is arranged at one end of the hard alloy matrix, the pointed cutting face is formed at the end of the diamond composite layer, the pointed cutting edge formed by the pointed cutting face can reduce the area of the cutting contact face between the micro spraying tooth and rock, the contact stress between the micro spraying tooth and the rock is improved, and therefore the micro spraying tooth can be used for cutting the rock. Therefore, the cutting efficiency of the micro spraying teeth and the mechanical drilling speed of the drill bit provided with the micro spraying teeth are improved, and the technical problem that the mechanical drilling speed of a drill bit for deep well operation is low in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of oil drilling, and in particular to a micro-spray tooth and a drill bit. Background Art

[0002] At present, diamond drill bits are widely used in oil and gas drilling projects. Diamond drill bits are mainly composed of drill bit body and cutting elements. Diamond drill bits are divided into three categories according to cutting elements: PDC (polycrystalline diamond) drill bits, TSP (thermally stable polycrystalline diamond) drill bits and natural diamond drill bits. The application scope of PDC drill bits is mainly used for drilling in soft to medium-hard formations, and TSP drill bits are mainly used for drilling in medium-hard to extremely hard formations. After continuous technological progress, the application scope of PDC drill bits is getting wider and wider, and it has good economic value.

[0003] In the related technology, during the drilling process of conventional PDC drill bits, due to the gradual increase in deep well operations in oil and gas drilling projects, the formations encountered are becoming more and more complex, and the rock breaking efficiency is low. In addition, the deeper the well, the greater the pressure of the mud on the rock column at the bottom of the well, the more difficult it is to break the rock at the bottom of the well, and the mechanical drilling speed of the drill bit is reduced.

[0004] Therefore, it is necessary to design a micro-spray tooth to solve the above problems. Utility Model Content

[0005] The present application provides a micro-spray tooth and a drill bit, which can solve the technical problem of slow mechanical drilling speed of a deep well operation drill bit in the related art.

[0006] In a first aspect, an embodiment of the present application provides a micro-spray tooth, comprising: a cemented carbide substrate and a diamond composite layer, wherein the diamond composite layer is disposed at one end of the cemented carbide substrate, and the end of the diamond composite layer forms at least one pointed cutting surface.

[0007] Wherein, the cemented carbide substrate can be set to a cylinder or an elliptical cylinder. When the radial cross-section of the cemented carbide substrate is circular, the radial cross-section diameter of the cemented carbide substrate can be set to 15.8 mm. The side wall of the cemented carbide substrate is provided with a positioning identification groove, and the positioning identification groove provides positioning for the micro-spray tooth installed on the drill bit to ensure that the inclined surface of the micro-spray tooth faces a set angle. The diamond composite layer can be set to a polycrystalline diamond composite layer, and the end of the diamond composite layer forms at least one of the pointed cutting surfaces. The end of the diamond composite layer can be set to one or more of the pointed cutting surfaces.

[0008] In combination with the first aspect, in one embodiment, the diamond composite layer is provided with at least two first bevels, and at least two of the first bevels form the pointed cutting surface. Wherein, a portion of the diamond composite layer is removed to form the first bevel, and at least two of the first bevels form the pointed cutting surface. The pointed blade formed by the pointed cutting surface can reduce the cutting contact surface area between the micro-spraying tooth and the rock, and increase the contact stress between the micro-spraying tooth and the rock, so that the rock is more easily broken, thereby improving the cutting efficiency of the micro-spraying tooth and the mechanical drilling speed of the drill bit equipped with the micro-spraying tooth. At least two of the first bevels can be set as two or more first bevels, and the two first bevels can be set at intervals or directly connected. Preferably, taking the diamond composite layer as an example with three first bevels, the three first bevels can be symmetrically arranged along the central axis of the diamond composite layer to form three pointed cutting surfaces, so that the cutting efficiency of the micro-spraying tooth is higher. In other embodiments, the three first bevels can be asymmetrically arranged along the central axis of the diamond composite layer.

[0009] In combination with the first aspect, in one embodiment, at least one of the first inclined surfaces is set as a curved surface. Among them, at least one of the first inclined surfaces can be set as a curved surface, so that the micro-spraying tooth maintains a certain cutting efficiency while improving the impact resistance of the micro-spraying tooth. In other embodiments, at least one of the first inclined surfaces can be set as a flat surface.

[0010] In combination with the first aspect, in one embodiment, at least two of the first bevels are connected by a first connecting surface, the first connecting surface is a plane, a curved surface or a bent surface, and at least two of the first bevels and the first connecting surface form the pointed cutting surface. Wherein, the first connecting surface can be set as a plane, a curved surface or a bent surface, so that the micro-spray tooth maintains a certain cutting efficiency while improving the impact resistance of the micro-spray tooth. The first connecting surface is respectively connected to each of the first bevels. Preferably, taking the diamond composite layer as an example with three first bevels, the three sides of the first connecting surface are respectively connected to the three first bevels, and the first connecting surface forms a pointed cutting surface with two adjacent first bevels. The first connecting surface and the three first bevels can form three pointed cutting surfaces, so that the cutting efficiency of the micro-spray tooth is improved, and at the same time, a new end face is added to increase the angle of the micro-spray tooth cutting contact surface and improve the impact resistance of the micro-spray tooth.

[0011] In combination with the first aspect, in one embodiment, a chamfer is provided between each of the first inclined surfaces and the first connecting surface, wherein a chamfer is provided between each of the first inclined surfaces and the first connecting surface, so that the impact resistance of the micro-spraying tooth is improved, thereby increasing the service life of the micro-spraying tooth.

[0012] In combination with the first aspect, in one embodiment, at least two of the first bevels are also connected by a second connecting surface, and the second connecting surface is also connected to the first connecting surface, and at least two of the first bevels, the first connecting surface and the second connecting surface form the pointed cutting surface. Wherein, the two sides of the second connecting surface are connected to the two adjacent first bevels, one end of the second connecting surface is connected to the first connecting surface, and the other end of the second connecting surface is connected to the diamond composite layer, the first connecting surface, the second connecting surface and the two adjacent first bevels form the pointed cutting surface, and the first connecting surface, the second connecting surface and the three first bevels can form three pointed cutting surfaces, so that the cutting efficiency of the micro-spray tooth is improved, and at the same time, the increase of the second connecting surface increases the angle of the micro-spray tooth cutting contact surface and improves the impact resistance of the micro-spray tooth.

[0013] In combination with the first aspect, in one embodiment, the angle between the first bevel and the axis of the cemented carbide substrate is 20-45 degrees. Wherein, the angle between the first bevel and the axis of the cemented carbide substrate is 20-45 degrees, preferably, the angle between the first bevel and the axis of the cemented carbide substrate can be set to 30 degrees (such as Figure 3 As shown, a is the angle between the first inclined surface and the axis of the cemented carbide substrate).

[0014] In combination with the first aspect, in one implementation, the cemented carbide substrate is provided with a through hole, and the through hole penetrates the cemented carbide substrate and the diamond composite layer.

[0015] Among them, the through hole penetrates the cemented carbide matrix and the diamond composite layer, and the through hole is used for the micro-spray tooth jet, so that the heat of the micro-spray tooth is effectively reduced, and the micro-spray tooth is prevented from thermal wear or tooth collapse due to overheating. At the same time, the jet can more fully cover the cutting teeth on the outer row of the drill bit, improve the overall cooling effect of the drill bit, and prevent the local cutting teeth from failing due to the peeling of the cemented carbide matrix and the diamond composite layer due to excessive temperature, and the wear resistance of the diamond composite layer is greatly reduced, thereby affecting the footage capacity of the drill bit. In addition, the jet ejected from the through hole by the micro-spray tooth is directly sprayed to the bottom of the well, so that the jet energy loss is less. Under the condition of the same hydraulic energy, the hydraulic energy of the micro-spray tooth can be more effectively utilized, so that the hydraulic impact assists the micro-spray tooth to break the rock, and achieves the effect of mixed rock breaking by impact and cutting, improves the rock breaking efficiency, and increases the mechanical drilling speed of the drill bit. In general, the jet of the drill bit is ejected from the nozzle and shot to the bottom of the well through the chip groove. The nozzle is generally installed at a certain distance from the bottom of the well. The jet is shot to the bottom of the well after passing through the chip groove. The water flow velocity is reduced and the hydraulic energy loss is large. The diameter of the tail end of the through hole is larger than the diameter of the outlet, so that the water flow is reduced at the tail end of the through hole, preventing the joint part of the micro-spray tooth and the drill bit from being eroded, thereby improving the installation safety of the micro-spray tooth. A section of the through hole located in the diamond composite layer can be set as a cylinder, and a section of the through hole located in the cemented carbide substrate can be set as a truncated cone, and the diameter of the cylinder is equal to the diameter of the smaller end of the truncated cone. In other embodiments, a section of the through hole located in the diamond composite layer can be set as a cylinder, and a section of the through hole located in the cemented carbide substrate can be set as a combination of a cylinder and a truncated cone, and the diameter of the cylinder is equal to the diameter of the smaller end of the truncated cone (such as Fig. 9 As shown, B01 is the chip groove and B02 is the nozzle).

[0016] In combination with the first aspect, in one embodiment, the diamond composite layer is provided with at least two second bevels, at least two of the second bevels form the pointed cutting surface, and at least a portion of the second bevels extends to the cemented carbide substrate. Among them, at least two of the second bevels form the pointed cutting surface, and at least part of the second bevel extends to the cemented carbide substrate. The second bevel can be set as a parabola, and the area of ​​the second bevel is larger than that of the first bevel. The cutting edge formed by the pointed cutting surface can further reduce the cutting contact surface area between the micro-spraying tooth and the rock, increase the contact stress between the micro-spraying tooth and the rock, and make the rock easier to be broken, thereby improving the cutting efficiency of the micro-spraying tooth. A chamfer is set between each of the second bevels and the first connecting surface, so that the impact resistance of the micro-spraying tooth is improved, thereby increasing the service life of the micro-spraying tooth. At least two of the second bevels can be set as two or more second bevels, and two of the second bevels can be set at intervals or directly connected. Preferably, taking the diamond composite layer as an example with three second bevels, the three second bevels can be symmetrically arranged along the central axis of the diamond composite layer to form three pointed cutting surfaces, so that the micro-spraying tooth has higher cutting efficiency. In other embodiments, the three second bevels can be asymmetrically arranged along the central axis of the diamond composite layer.

[0017] In a second aspect, an embodiment of the present application provides a drill bit, which includes a main body, and a plurality of micro-spray teeth are installed on the main body.

[0018] The drill bit comprises a main body, a plurality of micro-spray teeth are installed on the main body, and a blade wing is also installed on the main body. The blade wing is divided into an inner cone portion, a nose shoulder portion and a gauge portion from the inside to the outside. Conventional cylindrical teeth can be arranged on the inner cone portion of the blade wing, and a plurality of micro-spray teeth can be arranged on the nose shoulder portion of the blade wing (such as Figure 8 and Fig. 9 As shown, C01 is a conventional cylindrical tooth, C02 is a micro-spray tooth of the present application), a water hole is provided in the main body, and the water hole is connected to the micro-spray tooth through a flow channel.

[0019] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0020] A diamond composite layer is provided at one end of a cemented carbide substrate, and a pointed cutting surface is formed at the end of the diamond composite layer. The pointed blade formed by the pointed cutting surface can reduce the cutting contact surface area between the micro-spraying tooth and the rock, and increase the contact stress between the micro-spraying tooth and the rock, making the rock easier to be broken, thereby improving the cutting efficiency of the micro-spraying tooth and the mechanical drilling speed of the drill bit equipped with the micro-spraying tooth, and solving the technical problem of slow mechanical drilling speed of deep well operation drill bits in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a micro-spray tooth provided in an embodiment of the present application;

[0023] Figure 2 A top view of a micro-spray tooth provided in an embodiment of the present application;

[0024] Figure 3 A cross-sectional view of a micro-spray tooth provided in an embodiment of the present application;

[0025] Figure 4 A schematic structural diagram of a micro-spray tooth with a connection surface provided in an embodiment of the present application;

[0026] Figure 5 A top view of a micro-spray tooth with a connection surface provided in an embodiment of the present application;

[0027] Figure 6 A cross-sectional view of a micro-spray tooth with a connection surface provided in an embodiment of the present application;

[0028] Figure 7 A schematic diagram of the structure of a micro-spray tooth with a large-area inclined surface provided in an embodiment of the present application;

[0029] Figure 8 A schematic diagram of the structure of a drill bit provided in an embodiment of the present application and equipped with a plurality of micro-spray teeth;

[0030] Fig. 9 A top view of a drill bit provided in an embodiment of the present application and equipped with a plurality of micro-spray teeth;

[0031] Fig.10 A cross-sectional view of a drill bit provided in an embodiment of the present application and equipped with a plurality of micro-spray teeth.

[0032] In the figure: 1, cemented carbide substrate; 101, through hole; 102, positioning identification groove; 2, diamond composite layer; 201, first inclined surface; 202, first connecting surface; 203, second connecting surface; 204, second inclined surface; 205, chamfer; 3, main body; 301, blade; 302, water hole; 303, flow channel. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] The embodiments of the present application provide a micro-spray tooth and a drill bit, which can solve the technical problem of slow mechanical drilling speed of a drill bit for deep well operations.

[0035] See also Figure 1 As shown, an embodiment of the present application provides a micro-spray tooth, which includes: a cemented carbide substrate 1 and a diamond composite layer 2, wherein the diamond composite layer 2 is arranged at one end of the cemented carbide substrate 1, and the end of the diamond composite layer 2 forms at least one pointed cutting surface.

[0036] In this embodiment, the cemented carbide substrate 1 can be set to a cylinder or an elliptical cylinder. When the radial cross-section of the cemented carbide substrate 1 is circular, the radial cross-section diameter of the cemented carbide substrate 1 can be set to 15.8 mm. The side wall of the cemented carbide substrate 1 is provided with a positioning identification groove 102. The positioning identification groove 102 provides positioning for the micro-spray tooth to be installed on the drill bit to ensure that the inclined surface of the micro-spray tooth faces the set angle. The diamond composite layer 2 can be set to a polycrystalline diamond composite layer 2. The end of the diamond composite layer 2 forms at least one of the pointed cutting surfaces. The end of the diamond composite layer 2 can be set to one or more of the pointed cutting surfaces.

[0037] In this embodiment, the diamond composite layer 2 is arranged at one end of the cemented carbide substrate 1, and the pointed cutting surface is formed at the end of the diamond composite layer 2. The pointed blade formed by the pointed cutting surface can reduce the cutting contact surface area between the micro-spraying tooth and the rock, and increase the contact stress between the micro-spraying tooth and the rock, so that the rock is more easily broken, thereby improving the cutting efficiency of the micro-spraying tooth and the mechanical drilling speed of the drill bit equipped with the micro-spraying tooth, and solving the technical problem of slow mechanical drilling speed of deep well operation drill bits in related technologies.

[0038] Further, see Figure 1 As shown, in some embodiments, the diamond composite layer 2 is provided with at least two first bevels 201 , and at least two of the first bevels 201 form the pointed cutting surface.

[0039] In this embodiment, a portion of the diamond composite layer 2 is removed to form the first bevel 201, and at least two of the first bevels 201 form the pointed cutting surface. The pointed blade formed by the pointed cutting surface can reduce the cutting contact surface area between the micro-spraying tooth and the rock, and increase the contact stress between the micro-spraying tooth and the rock, so that the rock is more easily broken, thereby improving the cutting efficiency of the micro-spraying tooth and the mechanical drilling speed of the drill bit equipped with the micro-spraying tooth. At least two of the first bevels 201 can be set as two or more first bevels 201, and the two first bevels 201 can be set at intervals or directly connected. Preferably, taking the diamond composite layer 2 as an example with three first bevels 201, the three first bevels 201 can be symmetrically arranged along the central axis of the diamond composite layer 2 to form three pointed cutting surfaces, so that the micro-spraying tooth has higher cutting efficiency. In other embodiments, the three first bevels 201 can be asymmetrically arranged along the central axis of the diamond composite layer 2.

[0040] Further, see Figure 1 As shown, in some embodiments, at least one of the first inclined surfaces 201 is set as a curved surface. In this embodiment, at least one of the first inclined surfaces 201 can be set as a curved surface, so that the micro-spraying tooth maintains a certain cutting efficiency while improving the impact resistance of the micro-spraying tooth. In other embodiments, at least one of the first inclined surfaces 201 can be set as a flat surface.

[0041] Further, see Figure 1-3 As shown, in some embodiments, at least two of the first inclined surfaces 201 are connected by a first connecting surface 202, and the first connecting surface 202 is a plane, a curved surface, or a bent surface. At least two of the first inclined surfaces 201 and the first connecting surface 202 form the pointed cutting surface.

[0042] In this embodiment, the first connecting surface 202 can be set to a plane, a curved surface or a bent surface, so that the micro-spray tooth maintains a certain cutting efficiency while improving the impact resistance of the micro-spray tooth. The first connecting surface 202 is respectively connected to each of the first bevels 201. Preferably, taking the diamond composite layer 2 having three first bevels 201 as an example, the three sides of the first connecting surface 202 are respectively connected to the three first bevels 201, and the first connecting surface 202 forms a pointed cutting surface with two adjacent first bevels 201. The first connecting surface 202 and the three first bevels 201 can form three pointed cutting surfaces, so that the cutting efficiency of the micro-spray tooth is improved. At the same time, a new end face is added to increase the angle of the cutting contact surface of the micro-spray tooth and improve the impact resistance of the micro-spray tooth.

[0043] Further, see Figure 4-6As shown, in some embodiments, a chamfer 205 is provided between each of the first inclined surfaces 201 and the first connecting surface 202. In this embodiment, a chamfer 205 is provided between each of the first inclined surfaces 201 and the first connecting surface 202, so that the impact resistance of the micro-spraying tooth is improved, thereby increasing the service life of the micro-spraying tooth.

[0044] Further, see Figure 4-6 As shown, in some embodiments, at least two of the first bevels 201 are connected by a second connecting surface 203, and the second connecting surface 203 is also connected to the first connecting surface 202, and at least two of the first bevels 201, the first connecting surface 202 and the second connecting surface 203 form the pointed cutting surface.

[0045] In this embodiment, both sides of the second connecting surface 203 are connected to two adjacent first bevels 201, one end of the second connecting surface 203 is connected to the first connecting surface 202, and the other end of the second connecting surface 203 is connected to the diamond composite layer 2, the first connecting surface 202, the second connecting surface 203 and the two adjacent first bevels 201 form the pointed cutting surface, and the first connecting surface 202, the second connecting surface 203 and the three first bevels 201 can form three pointed cutting surfaces, so that the cutting efficiency of the micro-spray tooth is improved, and at the same time, the increase of the second connecting surface 203 increases the angle of the cutting contact surface of the micro-spray tooth and improves the impact resistance of the micro-spray tooth.

[0046] Further, see Figure 3 As shown, in some embodiments, the angle between the first inclined surface 201 and the axis of the cemented carbide substrate 1 is 20-45 degrees.

[0047] In this embodiment, the angle between the first bevel 201 and the axis of the cemented carbide substrate 1 is 20-45 degrees. Preferably, the angle between the first bevel 201 and the axis of the cemented carbide substrate 1 can be set to 30 degrees (eg Figure 3 As shown, a is the angle between the first inclined surface 201 and the axis of the cemented carbide substrate 1).

[0048] Further, see Figure 1-10 As shown, in some embodiments, the cemented carbide substrate 1 is provided with a through hole 101 , and the through hole 101 passes through the cemented carbide substrate 1 and the diamond composite layer 2 .

[0049] In this embodiment, the through hole 101 passes through the cemented carbide substrate 1 and the diamond composite layer 2. The through hole 101 is used for the micro-spraying tooth jet, so that the heat of the micro-spraying tooth is effectively reduced, and the micro-spraying tooth is prevented from thermal wear or tooth collapse due to overheating. At the same time, the jet can more fully cover the cutting teeth on the outer row of the drill bit, thereby improving the overall cooling effect of the drill bit, and preventing the local cutting teeth from failing due to peeling of the cemented carbide substrate 1 and the diamond composite layer 2 due to excessive temperature, and the wear resistance of the diamond composite layer 2 is greatly reduced, thereby affecting the footage capacity of the drill bit. In addition, the jet ejected from the through hole 101 by the micro-spraying tooth is directly sprayed to the bottom of the well, so that the jet energy loss is less. Under the condition of the same hydraulic energy, the hydraulic energy of the micro-spraying tooth can be more effectively utilized, so that the hydraulic impact assists the micro-spraying tooth to break the rock, and achieves the effect of mixed rock breaking by impact and cutting, thereby improving the rock breaking efficiency and the mechanical drilling speed of the drill bit. Generally, In this case, the jet of the drill bit is ejected from the nozzle and shot to the bottom of the well through the chip groove. The nozzle is generally installed at a certain distance from the bottom of the well. The jet is shot to the bottom of the well after passing through the chip groove. The water flow velocity is reduced and the hydraulic energy loss is large. The diameter of the tail end of the through hole 101 is larger than the diameter of the outlet, so that the water flow is reduced at the tail end of the through hole 101, preventing the joint part of the micro-spray tooth and the drill bit from being eroded, and improving the installation safety of the micro-spray tooth. A section of the through hole 101 located in the diamond composite layer 2 can be set as a cylinder, and a section of the through hole 101 located in the cemented carbide substrate 1 can be set as a truncated cone, and the diameter of the cylinder is equal to the diameter of the smaller end of the truncated cone. In other embodiments, a section of the through hole 101 located in the diamond composite layer 2 can be set as a cylinder, and a section of the through hole 101 located in the cemented carbide substrate 1 can be set as a combination of a cylinder and a truncated cone, and the diameter of the cylinder is equal to the diameter of the smaller end of the truncated cone (such as Fig. 9 As shown, B01 is the chip groove and B02 is the nozzle).

[0050] Further, see Figure 7 As shown, in some embodiments, the diamond composite layer 2 is provided with at least two second bevels 204 , at least two of the second bevels 204 form the pointed cutting surface, and at least a portion of the second bevels 204 extend to the cemented carbide substrate 1 .

[0051] In this embodiment, at least two of the second bevels 204 form the pointed cutting surface, and at least part of the second bevels 204 extend to the cemented carbide substrate 1. The second bevel 204 can be set as a parabola. The area of ​​the second bevel 204 is larger than that of the first bevel 201. The cutting edge formed by the pointed cutting surface can further reduce the cutting contact area between the micro-spraying tooth and the rock, increase the contact stress between the micro-spraying tooth and the rock, make the rock easier to be broken, and thus improve the cutting efficiency of the micro-spraying tooth. Each of the second bevels 204 and the A chamfer 205 is provided between the first connecting surfaces 202 to improve the impact resistance of the micro-spraying teeth, thereby improving the service life of the micro-spraying teeth. At least two of the second bevels 204 can be set as two or more second bevels 204. The two second bevels 204 can be arranged at intervals or directly connected. Preferably, taking the diamond composite layer 2 as an example with three second bevels 204, the three second bevels 204 can be symmetrically arranged along the central axis of the diamond composite layer 2 to form three pointed cutting surfaces, so that the micro-spraying teeth have higher cutting efficiency. In other embodiments, the three second bevels 204 can be asymmetrically arranged along the central axis of the diamond composite layer 2.

[0052] See also Figure 8-10 As shown, an embodiment of the present application further provides a drill bit, which includes a main body 3, and a plurality of micro-spray teeth are installed on the main body 3.

[0053] In this embodiment, the drill bit includes a main body 3, the main body 3 is equipped with a plurality of micro-spray teeth, the main body 3 is also equipped with a blade wing 301, the blade wing 301 is divided into an inner cone portion, a nose shoulder portion and a gauge portion from the inside to the outside, a conventional cylindrical tooth can be arranged on the inner cone portion of the blade wing 301, and a plurality of micro-spray teeth can be arranged on the nose shoulder portion of the blade wing 301 (such as Figure 8 and Fig. 9 As shown, C01 is a conventional cylindrical tooth, C02 is a micro-spray tooth of the present application), a water hole 302 is provided in the main body 3, and the water hole 302 is connected to the micro-spray tooth through a flow channel 303.

[0054] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0055] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0056] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A micro-spray tooth, characterized in that: It includes: A cemented carbide substrate (1), the cemented carbide substrate (1) being provided with a through hole (101), the through hole (101) penetrating the cemented carbide substrate (1), and a section of the through hole (101) located in the cemented carbide substrate (1) being configured as a truncated cone; A diamond composite layer (2), the diamond composite layer (2) being arranged at one end of the cemented carbide substrate (1), the diamond composite layer (2) being provided with at least two first inclined surfaces (201), the at least two first inclined surfaces (201) being connected via a first connecting surface (202), the first connecting surface (202) being a plane, at least two first inclined surfaces (201) and the first connecting surface (202) forming a pointed cutting surface, the through hole (101) penetrating the diamond composite layer (2), a section of the through hole (101) located in the diamond composite layer (2) being arranged as a cylinder and connected to the first connecting surface (202).

2. The micro-spraying tooth according to claim 1, characterized in that: At least one of the first inclined surfaces (201) is configured as a curved surface.

3. The micro-spraying tooth according to claim 1, characterized in that: A chamfer (205) is provided between each of the first inclined surfaces (201) and the first connecting surface (202).

4. The micro-spraying tooth according to claim 1, characterized in that: At least two of the first inclined surfaces (201) are connected via a second connecting surface (203), and the second connecting surface (203) is also connected to the first connecting surface (202); at least two of the first inclined surfaces (201), the first connecting surface (202) and the second connecting surface (203) form the pointed cutting surface.

5. The micro-spraying tooth according to claim 1, characterized in that: The angle between the first inclined surface (201) and the axis of the cemented carbide substrate (1) is 20-45 degrees.

6. The micro-spraying tooth according to claim 1, characterized in that: The diamond composite layer (2) is provided with at least two second bevels (204), at least two of the second bevels (204) form the pointed cutting surface, and at least part of the second bevels (204) extends to the cemented carbide substrate (1).

7. A drill bit, characterized in that: It comprises a main body (3), on which the micro-spraying teeth according to any one of claims 1 to 6 are installed.

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