A densely packed multi-edged diamond drill tooth and a drill bit using the drill tooth

Abstract

A densely packed multi-edged diamond drill tooth and a drill bit using the drill tooth, the drill tooth comprises a cylindrical polycrystalline diamond layer, the top plane of the polycrystalline diamond layer is provided with a plurality of concave chip grooves, one end of the chip groove is open at the side of the polycrystalline diamond layer, and the other end penetrates into the middle of the top surface of the polycrystalline diamond layer, and adjacent chip grooves separate the top plane of the polycrystalline diamond layer into convex cutting edges, and the drill bit comprises a polycrystalline diamond layer with the above-mentioned drill tooth structure and a cemented carbide matrix. The utility model is novel in conception and ingenious in design, can effectively improve the cutting efficiency of the drill bit on the rock mass, has high drilling efficiency and long service life.

Description

Technical Field

[0001] The utility model belongs to the field of drilling tools, in particular to a diamond drill bit, in particular to a closely spaced multi-edged diamond drill tooth. Background Art

[0002] In the drilling process of oil extraction projects, drill bits are needed to grind the rock formation to form a wellbore for further drilling. From the perspective of drilling technology, the selection of drill bits is very important. The drill bit is a tool used to break rocks and form a wellbore in oil drilling. Its working performance will directly affect the drilling quality, drilling efficiency and drilling cost.

[0003] Drill bits can be divided into four types: diamond drill bits, polycrystalline diamond composite sheet (PDC) drill bits, scraper drill bits and roller drill bits. The four types of drill bits are applied in various fields according to their advantages and disadvantages. Most of the existing drill bits are truncated cone drill bits or dome drill bits. The cutting surface of the truncated cone drill bit is under great pressure and is easily damaged and broken. In addition, since the top is a flat structure, the chips generated by cutting during operation cannot be removed in time, causing excessive local temperature rise. The chips will also cause wear on the cutting surface when the drill bit rotates; the dome drill bit can remove chips, but only the front end of the dome drill bit is an effective working surface, which makes the drill bit structure relatively fragile, and the drill bit cutting surface is more easily damaged and needs to be replaced constantly, which affects both work efficiency and manufacturing costs. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model provides a densely packed multi-edged diamond drill tooth and a drill bit using the drill tooth.

[0005] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0006] A densely packed multi-edged diamond drill tooth comprises a cylindrical polycrystalline diamond layer. In the present application, a plurality of concave chip grooves are arranged on the top plane of the polycrystalline diamond layer. One end of the chip grooves is open at the side of the polycrystalline diamond layer, and the other end penetrates into the middle of the top surface of the polycrystalline diamond layer. Adjacent chip grooves separate the top plane of the polycrystalline diamond layer into raised cutting edges.

[0007] In the utility model, the concave depth of the chip groove is 1 / 6-3 / 4 of the thickness of the polycrystalline diamond layer.

[0008] In the utility model, the cutting edge of the cutting edge is distributed on the edge of the top plane of the polycrystalline diamond layer.

[0009] In the utility model, the cutting edge is tilted relative to the central axis of the top plane of the polycrystalline diamond, and the tilt angle is 5°-25°.

[0010] Furthermore, the cutting edge and the chip removal groove are slightly curved in an arc shape.

[0011] In the utility model, the cross section of the chip groove is a rounded rectangle, a semicircle, an ellipse or a V-shape, and one end of the chip groove that penetrates into the middle of the top surface of the polycrystalline diamond layer is in an arc shape.

[0012] In the present invention, the number of the chip grooves or cutting edges is 15-20.

[0013] In the utility model, the chip grooves and cutting edges are evenly distributed in the circumferential direction with the central axis of the top plane of the polycrystalline diamond layer as the center.

[0014] In the utility model, the chip grooves or cutting edges are arranged in groups, and each group of chip grooves or cutting edges are evenly distributed circumferentially with the central axis of the top plane of the polycrystalline diamond layer as the center.

[0015] A drill bit comprises a polycrystalline diamond layer and a cemented carbide matrix. The bottom of the polycrystalline diamond layer is fixedly connected to the cemented carbide matrix, and the top of the polycrystalline diamond layer is provided with the aforementioned densely packed multi-edged diamond drill teeth.

[0016] Compared with the prior art, this application has the following advantages:

[0017] (1) The polycrystalline diamond layer of the present application is designed with 15-20 chip grooves and cutting edges, which allows the cutting edge to maintain a narrow width, reduce the contact area between the cutting edge and the rock mass during operation, reduce the pressure on the cutting edge, and is not easily damaged, with high processing efficiency and long service life;

[0018] (2) The present application adopts a chip groove with one end opening on the side. During cutting, the chip groove can promptly remove the cutting debris, avoid cutting accumulation, and improve drilling efficiency;

[0019] (3) The cutting edge of the present application is distributed circumferentially with the central axis of the top plane of the polycrystalline diamond layer as the center, and the cutting edge and the chip groove are slightly curved in an arc shape. During cutting, the debris can rub against the side of the cutting edge, making the cutting edge self-sharpening and able to remain sharp at all times, thereby improving cutting efficiency.

[0020] Therefore, the utility model has novel conception and ingenious design, can effectively improve the cutting efficiency of the drill bit on the rock mass, has high drilling efficiency and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 for Figure 1 Side view of.

[0023] In the figure: a polycrystalline diamond layer 1, a chip groove 101, a cutting edge 102, a top plane 103 of the polycrystalline diamond layer, and a cemented carbide substrate 2. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby. Example

[0025] A close-packed multi-edged diamond drill tooth comprises a cylindrical polycrystalline diamond layer 1, such as Figure 1 and 2 As shown, the top plane 103 of the polycrystalline diamond layer is in a densely packed multi-blade shape, and the top plane 103 of the polycrystalline diamond layer is provided with 20 concave chip grooves 101, and the chip grooves 101 are evenly distributed circumferentially with the central axis of the top plane 103 of the polycrystalline diamond layer as the center, one end of the chip groove 101 is open at the side of the polycrystalline diamond layer 1, and the other end penetrates into the middle of the top plane 103 of the polycrystalline diamond layer, and the cross-section of the chip groove 101 is a rounded rectangle, and the end thereof that penetrates into the middle of the top plane 103 of the polycrystalline diamond layer is in an arc shape, and the concave depth of the chip groove 101 is 1 / 6 of the thickness of the polycrystalline diamond layer 1.

[0026] Adjacent chip grooves 101 separate the top plane 103 of the polycrystalline diamond layer into a raised cutting edge 102. The cutting edge 102 is approximately triangular or trapezoidal. The cutting edge of the cutting edge 102 is distributed at the edge of the top plane 103 of the polycrystalline diamond layer. The cutting edge is inclined relative to the central axis of the top plane 103 of the polycrystalline diamond layer. The inclination angle is 5°, and the cutting edge 102 is slightly completely arc-shaped. Example

[0027] A drill bit, such as Figure 1 and 2 As shown, it includes a polycrystalline diamond layer 1 and a cemented carbide substrate 2, the bottom of the polycrystalline diamond layer 1 is fixedly connected to the cemented carbide substrate 2, and the top of the polycrystalline diamond layer 1 is set as the multi-edged diamond drill teeth described in Example 1.

[0028] When the densely packed multi-blade diamond drill teeth described in the utility model are used for drilling and breaking rocks, the polycrystalline diamond layer 1 rotates axially as a whole, and each arc-shaped cutting edge 102 is uniformly subjected to force to cut the rock layer as a whole, and the cut chips are collected into the adjacent chip groove 101 located in front of the rotation direction. At the same time, along with the axial rotation of the drill bit, the chips continuously collected in the chip groove 101 are also discharged from the side opening of the chip groove 101 located on the polycrystalline diamond layer 1 due to the centrifugal effect.

[0029] In summary, combined with the above structure and use process, it can be found that the utility model has a novel concept and a clever design, can effectively improve the cutting efficiency of the drill bit on the rock mass, has high drilling efficiency and a long service life.

Claims

1. A close-packed multi-edged diamond drill tooth, comprising a cylindrical polycrystalline diamond layer, characterized in that: The top plane of the polycrystalline diamond layer is provided with a plurality of concave chip grooves, one end of which is open at the side of the polycrystalline diamond layer and the other end extends into the middle of the top surface of the polycrystalline diamond layer. Adjacent chip grooves separate the top plane of the polycrystalline diamond layer into raised cutting edges.

2. The close-packed multi-edged diamond drill tooth according to claim 1, characterized in that: The concave depth of the chip removal groove is 1 / 6-3 / 4 of the thickness of the polycrystalline diamond layer.

3. The close-packed multi-edged diamond drill tooth according to claim 1, characterized in that: The cutting edge of the cutting edge is distributed on the edge of the top plane of the polycrystalline diamond layer.

4. The close-packed multi-edged diamond drill tooth according to claim 1, characterized in that: The cutting edge is tilted relative to the central axis of the top plane of the polycrystalline diamond, and the tilt angle is 5°-25°.

5. The close-packed multi-edged diamond drill tooth according to claim 4, characterized in that: The cutting edge and the chip removal groove are slightly curved in an arc shape.

6. The close-packed multi-edged diamond drill tooth according to claim 1, characterized in that: The cross section of the chip groove is a rounded rectangle, a semicircle, an ellipse or a V-shape, and one end of the chip groove that penetrates into the middle of the top surface of the polycrystalline diamond layer is in an arc shape.

7. The close-packed multi-edged diamond drill tooth according to claim 1, characterized in that: The number of the chip grooves or cutting edges is 15-20.

8. The close-packed multi-edged diamond drill tooth according to claim 1, characterized in that: The chip removal grooves and cutting edges are evenly distributed in the circumferential direction with the central axis of the top plane of the polycrystalline diamond layer as the center.

9. The close-packed multi-edged diamond drill tooth according to claim 1, characterized in that: The chip grooves or cutting edges are arranged in groups, and each group of chip grooves or cutting edges is evenly distributed in the circumferential direction with the central axis of the top plane of the polycrystalline diamond layer as the center.

10. A drill bit, characterized in that: It comprises a polycrystalline diamond layer and a cemented carbide substrate, wherein the bottom of the polycrystalline diamond layer is fixedly connected to the cemented carbide substrate, and the top of the polycrystalline diamond layer is arranged as the closely spaced multi-edged diamond drill teeth as claimed in any one of claims 1-9.

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