POLYCRYSTALLINE DIAMOND COMPACT

Abstract

A polycrystalline diamond compact including a polycrystalline diamond layer and a cemented carbide substrate. The polycrystalline diamond layer is in the form of a cylinder including an upper surface, a bottom surface, and a side wall connecting the upper surface and the bottom surface. The cemented carbide substrate is bonded to the bottom surface of the polycrystalline diamond layer. The upper surface includes a center part and an edge part. The edge part includes a plurality of radially distributed cutting edges and cutting removal grooves. The plurality of cutting edges and cutting removal grooves are alternately distributed on the upper surface. One end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the center part, and the other end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the side wall.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of International Patent Application No. PCT/CN2017/105474 with an international filing date of Oct. 10, 2017, designating the United States, now pending, and further claims foreign priority benefits to Chinese Patent Application No. 201710149094.2 filed Mar. 14, 2017. The contents of all of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference.

BACKGROUND

This disclosure relates to the field of composite materials, and more particularly, to a polycrystalline diamond compact (PDC).

Polycrystalline diamond compacts (PDCs) are made by combining layers of polycrystalline diamonds (PCDs) with a layer of cemented carbide substrate. PDCs have the advantages of diamond's wear resistance and carbide's toughness and are widely used in drill bits. However, conventional PDC drill bits are inefficient in breaking rocks or cutting removal.

SUMMARY

Disclosed is a polycrystalline diamond compact that is efficient in breaking formations as well as cutting removal.

Disclosed is a polycrystalline diamond compact comprising a polycrystalline diamond layer and a cemented carbide substrate. The polycrystalline diamond layer is in the form of a cylinder comprising an upper surface, a bottom surface, and a side wall connecting the upper surface and the bottom surface. The cemented carbide substrate is bonded to the bottom surface of the polycrystalline diamond layer.

The upper surface comprises a center part and an edge part; the edge part comprises a plurality of radially distributed cutting edges and cutting removal grooves; the plurality of cutting edges and cutting removal grooves are alternately distributed on the upper surface; and one end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the center part, and the other end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the side wall.

Each of the plurality of cutting edges can comprise a first side surface and a second side surface, and an included angle between the first side surface and the second side surface can be greater than or equal to 90°.

The plurality of cutting edges and cutting removal grooves can extend radially and are annularly-distributed on the upper surface.

The plurality of cutting edges and cutting removal grooves can form an annular structure on the upper surface.

The included angle between the plurality of cutting removal grooves and the side wall can be greater than or equal to 90°.

The vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves can be greater than or equal to 0.2 mm, and the radial length of each of the cutting edges on the upper surface can be greater than or equal to 0.5 mm.

Chamfers can be disposed at a joint between the edge part of the upper part and the side wall.

The center part of the upper surface of the polycrystalline diamond layer can be provided with a cutting reservoir.

The cutting reservoir can be in the shape of circle or square.

The depth of the cutting reservoir relative to the upper surface can be less than one tenth of the thickness of the polycrystalline diamond layer from the upper surface to the bottom surface.

Advantages of the polycrystalline diamond compact in this disclosure are summarized as below. The polycrystalline diamond compact is efficient in breaking formations and cutting removal. In addition, the cutting element displays good impact resistance and excellent steerability.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a polycrystalline diamond compact without a cutting reservoir of the disclosure.

FIG. 2 is a schematic diagram of a polycrystalline diamond compact comprising a cutting reservoir of the disclosure.

FIG. 3 is a schematic diagram of a polycrystalline diamond compact comprising four cutting edges of the disclosure.

FIG. 4 is a schematic diagram of another polycrystalline diamond compact comprising four cutting edges of the disclosure.

FIG. 5 is a schematic diagram of a polycrystalline diamond compact comprising five cutting edges of the disclosure.

FIG. 6 is a schematic diagram of another polycrystalline diamond compact comprising five cutting edges of the disclosure.

FIG. 7 is a schematic diagram of a polycrystalline diamond compact comprising eight cutting edges of the disclosure.

FIG. 8 is a schematic diagram of another polycrystalline diamond compact comprising eight cutting edges of the disclosure

FIG. 9 is a schematic diagram of a polycrystalline diamond compact comprising ten cutting edges of the disclosure.

FIG. 10 is a schematic diagram of another polycrystalline diamond compact comprising ten cutting edges of the disclosure

FIG. 11 is a schematic diagram of a polycrystalline diamond compact comprising twelve cutting edges of the disclosure.

FIG. 12 is a schematic diagram of another polycrystalline diamond compact comprising twelve cutting edges of the disclosure.

DETAILED DESCRIPTION

To further illustrate, examples detailing a polycrystalline diamond compact are described below. It should be noted that the following examples are intended to describe and not to limit the description.

As shown in FIGS. 1 and 2, a polycrystalline diamond compact of the disclosure comprises a polycrystalline diamond layer 100 and a cemented carbide substrate 200. The polycrystalline diamond layer 100 is in the form of a cylinder comprising an upper surface 101, a bottom surface 101′, and a side wall 102 disposed between the upper surface 101 and the bottom surface 101′. The cemented carbide substrate 200 is bonded to the bottom surface 101′ of the polycrystalline diamond layer 100.

The upper surface comprises a center part and an edge part. The edge part of the upper surface comprises a plurality of radially distributed cutting edges 103 and cutting removal grooves 104. The plurality of cutting edges and cutting removal grooves are alternately disposed. One end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the center part, and the other end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the side wall. Optionally, as shown in FIG. 2, the center part of the upper surface of the polycrystalline diamond layer is provided with a cutting reservoir 105.

Example 1

As shown in FIGS. 3 and 4, a polycrystalline diamond compact comprising four cutting edges is provided. As shown in FIG. 3, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.87 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves is 1.23 mm. The included angle between two side surfaces of the cutting edges is 90°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 112°.

As shown in FIG. 4, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.83 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 99.5°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the chip removal grooves 104 is 123.2°.

Example 2

As shown in FIGS. 5 and 6, a polycrystalline diamond compact comprising five cutting edges is provided. As shown in FIG. 5, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.91 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 90°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 110°.

As shown in FIG. 6, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.87 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 100.1°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 125.6°.

Example 3

As shown in FIGS. 7 and 8, a polycrystalline diamond compact comprising eight cutting edges is provided. As shown in FIG. 7, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.78 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 90°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 113°.

As shown in FIG. 8, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.76 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 99.3°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 122.8°.

Example 4

As shown in FIGS. 9 and 10, a polycrystalline diamond compact comprising ten cutting edges is provided. As shown in FIG. 9, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.69 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 90°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 115°.

As shown in FIG. 10, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.68 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 99.1°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 126.5°.

Example 5

As shown in FIGS. 11 and 12, a polycrystalline diamond compact comprising eight cutting edges is provided. As shown in FIG. 11, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.72 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 90°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 116°.

As shown in FIG. 12, the radial extension length of the cutting edges 103 of the polycrystalline diamond compact is 1.70 mm, and the vertical distance from the peak of each of the cutting edges to the lowest point of the cutting removal grooves thereof is 1.23 mm. The included angle between two side surfaces of the cutting edges 103 is 99.7°. The cutting removal grooves 104 and the cutting edges 103 are alternately disposed and form an annular structure on the upper surface. The included angle between two side surfaces of the cutting removal grooves 104 is 128.3°.

The polycrystalline diamond compacts in the examples 1-5 are suitable for drilling in complex formations such as hard rocks and tough interlayers. The multiple cutting edges can greatly improve the utilization rate of the polycrystalline diamond compact, reduce the drilling cost, and prevent the formation of bit balling.

Unless otherwise indicated, the numerical ranges involved include the beginning and end values. It will be obvious to those skilled in the art that changes and modifications may be made, and therefore, the aim in the appended claims is to cover all such changes and modifications.

Claims

1. A polycrystalline diamond compact, comprising:

a polycrystalline diamond layer, the polycrystalline diamond layer being in the form of a cylinder comprising an upper surface, a bottom surface, and a side wall connecting the upper surface and the bottom surface; and

a cemented carbide substrate, the cemented carbide substrate being bonded to the bottom surface of the polycrystalline diamond layer; wherein:

the upper surface comprises a center part and an edge part;

the edge part comprises a plurality of radially distributed cutting edges and cutting removal grooves;

the plurality of cutting edges and cutting removal grooves are alternately disposed on the upper surface; and

one end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the center part, and the other end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the side wall.

2. The polycrystalline diamond compact of claim 1, wherein each of the plurality of cutting edges comprises a first side surface and a second side surface, and an included angle between the first side surface and the second side surface is greater than or equal to 90°.

3. The polycrystalline diamond compact of claim 1, wherein the plurality of cutting edges and cutting removal grooves forms an annular structure on the upper surface.

4. The polycrystalline diamond compact of claim 1, wherein a vertical distance from a peak of each of the cutting edges to a lowest point of the cutting removal grooves is greater than or equal to 0.2 mm, and a radial length of each of the cutting edges on the upper surface is greater than or equal to 0.5 mm.

5. The polycrystalline diamond compact of claim 1, wherein chamfers are disposed at a joint between the edge part of the upper part and the side wall.

6. The polycrystalline diamond compact of claim 1, wherein the center part of the upper surface of the polycrystalline diamond layer is provided with a cutting reservoir.

7. The polycrystalline diamond compact of claim 6, wherein one end of each of the plurality of cutting edges and cutting removal grooves extends to communicate with the cutting reservoir.

8. The polycrystalline diamond compact of claim 7, wherein the cutting reservoir is in the shape of circle or square.

9. The polycrystalline diamond compact of claim 8, wherein a depth of the cutting reservoir relative to the upper surface is less than one tenth of a thickness of the polycrystalline diamond layer from the upper surface to the bottom surface.