Rotatable spherical diamond compact

Abstract

The utility model discloses a rotatable spherical diamond compact, which belongs to the technical field of diamond compacts, and comprises a polycrystalline diamond layer, a hard alloy matrix and a hard alloy rotating mechanism, the polycrystalline diamond layer is fixedly connected with the hard alloy matrix, the polycrystalline diamond layer is hemispherical, and the hard alloy rotating mechanism is fixedly connected with the hard alloy matrix. A plurality of cutting edges are arranged on the spherical surface, and a concave chip groove is formed between every two adjacent cutting edges; the hard alloy rotating mechanism comprises an alloy cup wall, a hard alloy rotating shaft and an alloy cup bottom, the hard alloy rotating shaft is placed in the alloy cup wall, the alloy cup bottom and the bottom of the alloy cup wall are fixed in a welded mode, and the hard alloy rotating shaft is fixedly connected with the hard alloy base body. The contact area of the diamond compact and the rock is reduced, the chip removal efficiency is improved, the economic benefit is good, the hard alloy rotating mechanism is arranged, the service life of the drill bit is prolonged to the maximum extent, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of diamond composite sheets, and in particular relates to a rotatable spherical diamond composite sheet. Background Art

[0002] Diamond compacts (PDCs) are composite superhard materials made by sintering diamond powder, a binder, and cemented carbide under high temperature and high pressure. They are generally cylindrical in shape with a flat top surface.

[0003] In recent years, the extraction of unconventional oil and gas, such as shale oil and shale gas, has posed numerous challenges to drilling deep and complex rock formations. During drilling, traditional flat diamond plywood has a large contact surface with the rock, leading to slow penetration and mud balling. Furthermore, only a single cutting edge of the diamond plywood is used during actual drilling, while the remaining portion is fixed and cannot participate in drilling. When this cutting edge wears out or breaks during use, the diamond plywood becomes ineffective, resulting in low product utilization and unnecessary waste of resources. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a rotatable spherical diamond composite sheet, which solves the problems of the existing diamond composite sheet such as short service life and low drilling efficiency.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A rotatable spherical diamond composite sheet includes a polycrystalline diamond layer, a cemented carbide substrate and a cemented carbide rotating mechanism. The polycrystalline diamond layer is fixedly connected to the cemented carbide substrate. The polycrystalline diamond layer is hemispherical and has multiple cutting edges on the spherical surface. Concave chip grooves are provided between adjacent cutting edges. The cemented carbide rotating mechanism includes an alloy cup wall, a cemented carbide rotating shaft and an alloy cup bottom. The cemented carbide rotating shaft is placed in the alloy cup wall. The alloy cup bottom and the bottom of the alloy cup wall are fixed by welding. The cemented carbide rotating shaft and the cemented carbide substrate are fixedly connected by utilizing the high temperature and high pressure environment during diamond synthesis.

[0007] Wherein, the plurality of cutting edges are evenly distributed with the axis of the spherical top of the polycrystalline diamond layer as the center.

[0008] The number of the cutting edges is 3-8, and the radial depth of the chip groove is 0.3-0.8 mm.

[0009] The shape of the alloy cup wall is a small upper opening and a large lower opening, and the cross section of the cemented carbide rotating shaft is an inverted T shape.

[0010] The alloy cup wall is coaxial with the hard alloy rotating shaft and a gap is provided in the middle, and the gap is filled with a filler.

[0011] Wherein, the filler is hexagonal boron nitride or a mixture thereof with graphite, with graphite accounting for 10%-90%.

[0012] Wherein, the cemented carbide rotating mechanism is filled after being assembled and welded, and after filling, the cemented carbide rotating axis is equal to or slightly higher than the upper plane of the alloy cup wall.

[0013] Wherein, a mica ring is placed at the upper opening of the alloy cup wall, and the thickness of the mica ring is greater than or equal to the upper end wall thickness of the alloy cup wall.

[0014] The beneficial effects of adopting the technical solution of this utility model are:

[0015] This utility model designs the polycrystalline diamond layer into a spherical shape, which can reduce the contact area with the rock during drilling and increase the feed rate. The spherical surface is designed with multiple cutting edges and forms a concave chip removal groove, which improves chip removal efficiency and has good economic benefits. A carbide rotating mechanism is designed. After the rotating mechanism is welded and filled, the rotating mechanism is fixedly connected to the carbide substrate using the high temperature and high pressure environment during diamond synthesis, achieving 360° rotary cutting of the cutting edge, greatly improving the product's wear resistance, while also ensuring that the cutting edge can always maintain a highly efficient sharp state, maximizing the service life of the drill bit and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a rotatable spherical diamond composite sheet of the utility model;

[0017] Figure 2 This is a cross-sectional view of the rotatable spherical diamond composite carbide rotating mechanism of the utility model;

[0018] Figure 3 This is a top view of the rotatable spherical diamond composite sheet of the utility model;

[0019] Among them, 1-polycrystalline diamond layer, 101-cutting edge, 102-chip groove, 2-cemented carbide substrate, 3-cemented carbide rotating mechanism, 301-alloy cup wall, 302-alloy rotating shaft, 303-filler, 304-alloy cup bottom, 305-mica ring. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and do not limit the scope of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1-3 As shown, this embodiment provides a rotatable spherical diamond composite sheet, comprising a polycrystalline diamond layer 1, a cemented carbide substrate 2 and a cemented carbide rotating mechanism 3, wherein the polycrystalline diamond layer 1 is fixedly connected to the cemented carbide substrate 2.

[0024] The polycrystalline diamond layer 1 is hemispherical and has multiple cutting edges 101 disposed on the spherical surface. Concave chip grooves 102 are located between adjacent cutting edges 101. The chip grooves 102 are laser-machined into the diamond surface. In this embodiment, there are eight cutting edges 101, each with a radial depth of 0.5 mm. The eight cutting edges 101 are evenly distributed around the axis of the spherical top of the polycrystalline diamond layer 1. In the present invention, the number of cutting edges 101 is not limited to this number and can be set to 3-8 based on actual production needs.

[0025] Among them, the cemented carbide rotating mechanism 3 includes an alloy cup wall 301, a cemented carbide rotating shaft 302 and an alloy cup bottom 304. The cemented carbide rotating shaft 302 is placed in the alloy cup wall 301, and the alloy cup bottom 304 and the bottom of the alloy cup wall 301 are fixed by welding. The cemented carbide rotating shaft 302 and the cemented carbide substrate 2 are fixedly connected by utilizing the high temperature and high pressure environment during diamond synthesis.

[0026] The alloy cup wall 301 has a small upper opening and a large lower opening. The carbide rotating shaft 302 is shaped to match the alloy cup wall 301, and the cross-section of the carbide rotating shaft 302 is an inverted T-shape. The alloy cup wall 301 and the carbide rotating shaft 302 are coaxial and have a gap therebetween. The gap is filled with a filler 303. The filler 303 is hexagonal boron nitride or a mixture of hexagonal boron nitride and graphite, with the graphite accounting for 20%. In the present invention, the graphite percentage can be 10-90%. The carbide rotating shaft 302 is equal to or slightly higher than the upper plane of the alloy cup wall 301. A mica ring 305 is placed at the upper opening of the alloy cup wall 301. The mica ring 305 is greater than or equal to the thickness of the upper end wall of the alloy cup wall 301.

[0027] During assembly, the carbide rotating shaft 302 is first placed in the alloy cup wall 301, and then the alloy cup bottom 304 is placed on the bottom of the alloy cup wall 301 and fixed by welding; the gap between the alloy cup wall 301 and the carbide rotating shaft 302 is filled with filler, and then a mica ring 305 is placed at the upper mouth of the gold cup wall 301. After the rotating mechanism is welded and filled, the high temperature and high pressure environment during diamond synthesis is used to fix the rotating mechanism 3 to the carbide substrate 2.

[0028] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A rotatable spherical diamond composite sheet, comprising a polycrystalline diamond layer (1), a cemented carbide substrate (2) and a cemented carbide rotating mechanism (3), wherein the polycrystalline diamond layer (1) is fixedly connected to the cemented carbide substrate (2), and is characterized in that: The polycrystalline diamond layer (1) is hemispherical, and a plurality of cutting edges (101) are provided on the spherical surface, and concave chip grooves (102) are provided between adjacent cutting edges (101); the cemented carbide rotating mechanism (3) comprises an alloy cup wall (301), a cemented carbide rotating shaft (302) and an alloy cup bottom (304); the cemented carbide rotating shaft (302) is placed in the alloy cup wall (301), the alloy cup bottom (304) and the bottom of the alloy cup wall (301) are fixed by welding, and the cemented carbide rotating shaft (302) and the cemented carbide substrate (2) are fixedly connected by utilizing the high temperature and high pressure environment during diamond synthesis.

2. The rotatable spherical diamond compact according to claim 1, characterized in that: The plurality of cutting edges (101) are evenly distributed around the axis of the spherical top of the polycrystalline diamond layer (1).

3. The rotatable spherical diamond compact according to claim 1, characterized in that: The number of the cutting edges (101) is 3-8, and the radial depth of the chip groove (102) is 0.3-0.8 mm.

4. The rotatable spherical diamond compact according to claim 1, characterized in that: The alloy cup wall (301) has a small upper opening and a large lower opening, and the cross section of the hard alloy rotating shaft (302) is an inverted T-shape.

5. The rotatable spherical diamond compact according to claim 1, characterized in that: The alloy cup wall (301) is coaxial with the hard alloy rotating shaft (302), with a gap provided in the middle, and the gap is filled with a filler (303).

6. The rotatable spherical diamond compact according to claim 5, characterized in that: The hard alloy rotation axis (302) is equal to or slightly higher than the upper plane of the alloy cup wall (301).

7. The rotatable spherical diamond compact according to claim 6, characterized in that: A mica ring (305) is placed at the upper opening of the alloy cup wall (301), and the thickness of the mica ring (305) is greater than or equal to the upper end wall thickness of the alloy cup wall (301).

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