Multi-edge PDC cutting tooth for drilling

Abstract

A multi-blade PDC cutting tooth for drilling comprises a cylindrical tooth body, at least two arc-shaped notches are formed in the connecting portion of the upper end face and the side face of the cylindrical tooth body, the upper arc-shaped edges of the arc-shaped notches extend into the upper end face of the cylindrical tooth body, and the lower arc-shaped edges of the arc-shaped notches extend into the side face of the cylindrical tooth body. The vertex of the intersection of the upper arc-shaped edge and the lower arc-shaped edge coincides with the edge of the upper end face of the cylindrical tooth body. A blade body is formed between every two adjacent arc-shaped notches; according to the PDC cutting tooth, through the design of the cutting edge at the tip part of the cylindrical tooth body, point load and tension-shear action can be generated to destroy rocks, cutting resistance is reduced, the PDC cutting tooth is more easily pressed into the rocks, aggressiveness of the PDC cutting tooth is improved, the rock breaking speed of the PDC cutting tooth is higher, and drilling efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of PDC cutting teeth, in particular to a multi-edge PDC cutting tooth for drilling. Background Art

[0002] The PDC cutting tooth is a highly efficient cutting tool widely used in the fields of machining, oil drilling, etc. It is usually composed of two parts. The upper part is a polycrystalline diamond layer, which is the working part of the cutting tooth and has extremely high hardness and wear resistance. The lower part is a cemented carbide backing layer, which provides support for the polycrystalline diamond layer so that it can withstand the huge pressure and impact force during the cutting process.

[0003] The current PDC cutting teeth are usually cylindrical. The invention patent with the application number CN2018101394386 discloses a PDC drill bit with conical auxiliary cutting teeth. The PDC main cutting teeth installed on this PDC drill bit are cylindrical. The defect of this kind of PDC cutting tooth in use is that the cylindrical tooth body structure results in insufficient aggressiveness, and when encountering hard rocks, there will be problems such as slow rock breaking and incomplete rock breaking, affecting the drilling efficiency, and it needs to be improved. Summary of the Utility Model

[0004] In order to solve the above problems, the utility model provides a multi-edge PDC cutting tooth for drilling.

[0005] The technical solution of the utility model is: a multi-edge PDC cutting tooth for drilling, including a cylindrical tooth body, which is sintered from diamond micropowder and a binder under high temperature and high pressure. At least two arc-shaped notches are provided at the intersection of the upper end face and the side face of the cylindrical tooth body. The arc-shaped notches are integrally elliptical. The upper arc-shaped edge of the arc-shaped notch extends into the upper end face of the cylindrical tooth body, and the lower arc-shaped edge extends into the side face of the cylindrical tooth body. The extension area of the upper arc-shaped edge is the same as the extension area of the lower arc-shaped edge. The vertex at the intersection of the upper arc-shaped edge and the lower arc-shaped edge coincides with the edge of the upper end face of the cylindrical tooth body; a cutting edge is formed between adjacent arc-shaped notches, and the size of the cutting edge can be changed by adjusting the distance between the arc-shaped notches.

[0006] Preferably, the two arc-shaped notches are arranged side by side to form a single-edge cutting tooth.

[0007] Preferably, the arc-shaped notches are provided in two groups, and each group has two arc-shaped notches. The two groups of arc-shaped notches are symmetrically arranged with respect to the axis center plane of the cylindrical tooth body to form a double-edge cutting tooth.

[0008] Preferably, the arc-shaped notches are evenly distributed in seven to form a seven-edge cutting tooth.

[0009] Preferably, the width of the cutting edge is a, and 0 < a ≤ 6 mm.

[0010] Preferably, the length of the arc-shaped notch is b, where 5 ≤ b ≤ 10 mm.

[0011] Preferably, the width of the arc-shaped notch is c, where 1 ≤ c ≤ 5 mm.

[0012] Preferably, the overall inclination angle of the arc-shaped notch is α, where 40° ≤ α ≤ 50°.

[0013] The beneficial technical effects of the present utility model are as follows:

[0014] (1) Through the edge design at the tip of the cylindrical tooth body of the present utility model, point load and tensile-shear action can be generated to break rocks, reduce the cutting resistance, more easily penetrate into the rocks, improve the aggressiveness of the PDC cutting tooth, make the rock-breaking speed faster, and effectively improve the drilling efficiency.

[0015] (2) The width direction of the arc-shaped notch of the present utility model extends to the upper surface and the side surface of the tooth body respectively. This width design is used to generate the function of guiding and discharging slag, which is beneficial to maintaining sufficient impact resistance while improving the aggressiveness of the PDC cutting tooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the single-edge cutting tooth structure of the present utility model;

[0017] Figure 2 is Figure 1 the top view structural schematic diagram of

[0018] Figure 3 is Figure 2 the sectional structural schematic diagram taken along the A-A direction of

[0019] Figure 4 is a three-dimensional structural schematic diagram of the double-edge cutting tooth structure of the present utility model;

[0020] Figure 5 is Figure 4 the top view structural schematic diagram of

[0021] Figure 6 is a three-dimensional structural schematic diagram of the seven-edge cutting tooth structure of the present utility model;

[0022] Figure 7 is Figure 6 the top view structural schematic diagram of

[0023] Figure 8 is one of the product diagrams of the present utility model;

[0024] Figure 9 is the second product diagram of the present utility model.

[0025] In the figure, 1. cylindrical tooth body, 2. arc-shaped notch, 3. blade body. DETAILED DESCRIPTION

[0026] Embodiment 1, see attached Figures 1-3 A multi-blade PDC cutting tooth for drilling, comprising a cylindrical tooth body 1, two arc-shaped notches 2 are provided at the intersection of the upper end face and the side face of the cylindrical tooth body 1, the upper arc-shaped edge of the arc-shaped notch 2 extends to the inside of the upper end face of the cylindrical tooth body 1, and the lower arc-shaped edge extends to the inside of the side face of the cylindrical tooth body 1. This width design is used to produce the effect of diversion and slag removal, which is beneficial to maintain its sufficient impact resistance while improving the aggressiveness of the PDC cutting tooth; the vertex at the intersection of the upper arc-shaped edge and the lower arc-shaped edge coincides with the edge of the upper end face of the cylindrical tooth body 1, so that the size of the upper half of the arc-shaped notch 2 is the same as that of the lower half; a blade 3 is formed between adjacent arc-shaped notches 2.

[0027] The width of the blade 3 is a, 0<a≤6mm, the overall inclination angle of the arc-shaped notch 2 is α, 40°≤α≤50°, and the size and inclination angle of the blade can be adjusted according to the model of the drill bit so that it can achieve the best drilling efficiency when dealing with various tasks.

[0028] The length of the arc notch 2 is b, 5≤b≤10mm, the width of the arc notch 2 is c, 1≤c≤5mm, and the size of the arc notch 2 is adjusted with the size of the blade 3 to achieve the best diversion and slag removal effect and to achieve the best impact resistance. The diameter of the arc notch 2 is d.

[0029] This embodiment, through the cutting edge design at the tip of the cylindrical tooth body 1, can generate point load and shearing action to destroy the rock, reduce cutting resistance, make it easier to press into the rock, improve the aggressiveness of the PDC cutting tooth, make it break the rock faster, and effectively improve the drilling efficiency.

[0030] Embodiment 2, see attached Figures 4-5 This embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that two groups of arc notches 2 are provided at the intersection of the upper end face and the side face of the cylindrical tooth body 1, and each group of arc notches 2 is two, and the two groups of arc notches 2 are symmetrically arranged about the axis center plane of the cylindrical tooth body 1 to form a double-edged cutting tooth. The double-edged cutting tooth design of this embodiment allows the working blade 3 to be disassembled and reinstalled in the opposite direction when it is severely worn or damaged, thereby forming a new working blade 3, thereby extending the service life of the PDC cutting tooth and the drill bit.

[0031] Embodiment 3, see attached Figures 6-7, this embodiment is basically the same as the first embodiment, and the same parts will not be described again. The differences are as follows: Seven arc-shaped notches 2 are evenly distributed at the intersection of the upper end surface and the side surface of the columnar tooth body 1 to form seven-edge cutting teeth. The evenly distributed cutting teeth in this embodiment can achieve the effect of multi-edge combined rock breaking. More brittle cracks are likely to be generated inside the rock, thereby producing larger volume fragmentation, further improving the rock-breaking efficiency. And after the cutting edges on one side are severely worn, the life of the PDC cutting teeth can also be extended by swapping them.

Claims

1. A multi-edge PDC cutting tooth for drilling, characterized by: It includes a cylindrical tooth body, and at least two arc-shaped notches are provided at the intersection of the upper end face and the side face of the cylindrical tooth body. The upper arc-shaped edge of the arc-shaped notch extends to the inside of the upper end face of the cylindrical tooth body, and the lower arc-shaped edge extends to the inside of the side face of the cylindrical tooth body. The vertex at the intersection of the upper arc-shaped edge and the lower arc-shaped edge coincides with the edge of the upper end face of the cylindrical tooth body; a blade body is formed between adjacent arc-shaped notches.

2. A multi-edge PDC cutting tooth for drilling according to claim 1, characterized in that: The arc-shaped notches are arranged in two parallel rows to form single-edged cutting teeth.

3. The multi-edge PDC cutting tooth for drilling according to claim 1, characterized in that: The arc-shaped notches are arranged in two groups, each group has two arc-shaped notches, and the two groups of arc-shaped notches are arranged symmetrically with respect to the axis center plane of the cylindrical tooth body to form double-edged cutting teeth.

4. The multi-edge PDC cutting tooth for drilling according to claim 1, characterized in that: The arc-shaped notches are evenly distributed in seven, forming a seven-edged cutting tooth.

5. The multi-edge PDC cutting tooth for drilling according to claim 1, characterized in that: The width of the blade is a, 0<a≤6mm.

6. The multi-edge PDC cutting tooth for drilling according to claim 1, characterized in that: The length of the arc-shaped notch is b, 5≤b≤10 mm.

7. The multi-edge PDC cutting tooth for drilling according to claim 6, characterized in that: The width of the arc-shaped notch is c, 1≤c≤5mm.

8. The multi-edge PDC cutting tooth for drilling according to claim 1, characterized in that: The overall inclination angle of the arc-shaped notch is α, 40°≤α≤50°.

Images