Special-shaped polycrystalline diamond compact

Abstract

The utility model belongs to the field of superhard composite materials, and particularly relates to a polycrystalline diamond compact with a special-shaped structure. A non-circular convex frame is arranged at the top of the polycrystalline diamond layer, the non-circular convex frame is provided with at least two corners, and each corner extends towards the periphery of the polycrystalline diamond layer to form a convex strip; the outer edge of the polycrystalline diamond layer between the adjacent convex strips is concave downwards, so that an inclined concave surface is formed between the outer edge of the polycrystalline diamond layer and the non-circular convex frame; cutting surfaces are arranged at the connecting parts of the raised lines and the side cylindrical surface of the polycrystalline diamond layer; the cutting face comprises an upper cutting face and side cutting faces, the upper cutting face is located on the upper surface of the protruding strip, the side cutting faces are located on the two sides of the protruding strip, and the upper cutting face corresponds to the side cutting faces; through a 4D acting part of a multi-surface structure, excellent impact resistance and lithology breaking property are achieved, through optimization of geometrical shapes, cutting pressure is concentrated in a specific area, the cutting efficiency is improved, and the service life of the composite sheet is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of superhard composite materials, and in particular relates to a polycrystalline diamond composite sheet with an irregular structure. Background Technology

[0002] Polycrystalline diamond composite sheets are made by sintering high-quality diamond and a cemented carbide matrix using a high-temperature, high-pressure (HTHP) process. They combine the high hardness and wear resistance of diamond with the high impact resistance of cemented carbide, making them an ideal drilling material due to their excellent comprehensive performance. As drilling depth increases, the formations become harder and more complex, demanding higher impact resistance from polycrystalline diamond composite sheets. Existing technologies often improve the impact resistance of polycrystalline diamond composite sheets by creating irregular shapes on the composite layer. For example, utility model patent CN 213330910 U discloses a diamond composite sheet and drill bit for plastic formations. In this design, the center of the diamond layer of the composite sheet has a recessed portion along the axial direction of the matrix. This recessed portion has a spherical design, resulting in uniform stress distribution and dispersed cutting pressure. However, this can lead to insufficient local cutting force, affecting the drilling speed and making the material prone to damage. Utility Model Content

[0003] In view of the technical problems of insufficient impact resistance and easy damage of polycrystalline diamond composite sheets, the technical problem to be solved by this utility model is to provide a polycrystalline diamond composite sheet with an irregular structure.

[0004] The present invention adopts the following technical solution:

[0005] A polycrystalline diamond composite sheet with an irregular structure, comprising a cemented carbide substrate and a polycrystalline diamond layer attached to the cemented carbide substrate, wherein a non-circular convex frame is provided on the top of the polycrystalline diamond layer, the non-circular convex frame having at least two corners, each corner extending towards the periphery of the polycrystalline diamond layer to form a convex strip; adjacent convex strips are recessed at the outer edge of the polycrystalline diamond layer, forming an inclined concave surface between the outer edge of the polycrystalline diamond layer and the non-circular convex frame; a cutting surface is provided at the connection between the convex strip and the side cylindrical surface of the polycrystalline diamond layer; the cutting surface includes an upper cutting surface and a side cutting surface, the upper cutting surface being located on the upper surface of the convex strip, and the side cutting surfaces being located on both sides of the convex strip, with the upper cutting surface corresponding to the side cutting surface.

[0006] The non-circular convex frame outline is square, or a four-pointed star, or a rhombus, or a triangle.

[0007] The non-circular convex frame has a second concave surface inside its recess.

[0008] The second concave surface is inscribed in relation to the non-circular convex frame.

[0009] The included angle between the upper cutting surface and the side cutting surface is ≥130°; the included angle between the two side cutting surfaces corresponding to the same upper cutting surface is ≥35°; and the included angle between the same upper cutting surface and the upper surface of the non-circular convex frame is ≥12°.

[0010] The bottom of the internal recess of the non-circular convex frame can be either a plane or a curved surface; the depth of the internal recess of the non-circular convex frame is ≥0.2 mm.

[0011] The vertical distance from the center point of the top of the inclined concave surface to the non-circular convex frame is ≥1.5 mm.

[0012] The angle between the inclined concave surface and the non-circular convex frame is ≥25°.

[0013] The bottom of the inclined concave surface is either flat or curved.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention provides a polycrystalline diamond composite sheet with an irregular structure. Through the 4D action area with a multi-faceted structure, it has excellent impact resistance and rock-breaking ability. Through the optimization of the geometry, the cutting pressure is concentrated in a specific area, which improves the cutting efficiency, extends the service life of the composite sheet, and improves the overall stability. The various structural variations can provide customers with a wider range of choices to fully adapt to the complexity of the downhole formation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a perspective view of Example 1 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0018] Figure 3 This is a top view of Embodiment 1 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0019] Figure 4 This is a perspective view of Embodiment 2 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0020] Figure 5 This is a top view of Embodiment 2 of the polycrystalline diamond composite sheet with irregular structure of this utility model.

[0021] Figure 6 This is a cross-sectional view (AA) of Example 2 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0022] Figure 7 This is a BB cross-sectional view of Embodiment 2 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0023] Figure 8 This is a CC cross-sectional view of Embodiment 2 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0024] Figure 9 This is a perspective view of Embodiment 2 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0025] Figure 10 This is a top view of Embodiment 2 of the polycrystalline diamond composite sheet with irregular structure of this utility model.

[0026] Figure 11 This is a perspective view of Embodiment 2 of the polycrystalline diamond layer of the irregularly shaped polycrystalline diamond composite sheet of this utility model.

[0027] Figure 12 This is a top view of Embodiment 2 of the polycrystalline diamond composite sheet with irregular structure of this utility model.

[0028] Among them, 1 is a polycrystalline diamond layer; 11 is a first concave surface; 12 is a non-circular convex frame; 13 is an inclined concave surface; 14 is a side cylindrical surface; 15 is an upper cutting surface; 16 is a side cutting surface; 17 is a second concave surface; 18 is a raised strip; and 2 is a cemented carbide substrate. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0030] like Figure 1 As shown, a polycrystalline diamond composite sheet with an irregular structure is disclosed. The polycrystalline diamond composite sheet is cylindrical and includes a cemented carbide substrate 2 and a polycrystalline diamond layer 1 connected to the cemented carbide substrate 2. The polycrystalline diamond layer 1 and the cemented carbide substrate 2 are composited by high temperature and high pressure technology. The interface between the polycrystalline diamond layer 1 and the cemented carbide substrate 2 is a planar or uneven surface.

[0031] like Figure 2-12As shown, a non-circular convex frame 12 is provided on the top of the polycrystalline diamond layer. The inner recess of the non-circular convex frame 12 is a first concave surface 11. The non-circular convex frame 12 has at least two corners, each corner extending towards the periphery of the polycrystalline diamond layer to form a convex strip 18. The adjacent convex strips 18 are recessed at the outer edge of the polycrystalline diamond layer, so that an inclined concave surface 13 is formed between the outer edge of the polycrystalline diamond layer and the non-circular convex frame. A cutting surface is provided at the connection between the convex strip 18 and the side cylindrical surface 14 of the polycrystalline diamond layer. The cutting surface includes an upper cutting surface 15 and a side cutting surface 16. The upper cutting surface 15 is located on the upper surface of the convex strip 18, and the side cutting surface 15 is located on both sides of the convex strip 18, and the upper cutting surface 15 corresponds to the side cutting surface 16. The working part, which is jointly constructed by the cutting surface and the side cylindrical surface of the polycrystalline diamond layer, has a 4D structure and has excellent impact resistance and rock breaking ability.

[0032] like Figure 5-7 As shown, the included angle T1 between the upper cutting surface 15 and the side cutting surface 16 is ≥130°; the included angle T2 between the two side cutting surfaces 16 corresponding to the same upper cutting surface 15 is ≥35°; and the included angle T3 between the same upper cutting surface 15 and the upper surface of the non-circular convex frame is ≥12°.

[0033] The bottom of the internal recess of the non-circular convex frame 12 can be either a flat surface or a curved surface; the depth of the internal recess of the non-circular convex frame 12 is ≥0.2 mm; the middle recess increases the heat dissipation area, reduces thermal damage, optimizes the internal stress distribution, and improves the overall stability.

[0034] The vertical distance L from the center point of the top of the inclined concave surface 13 to the non-circular convex frame 12 is ≥1.5 mm.

[0035] like Figure 8 As shown, the angle T4 between the inclined concave surface 13 and the non-circular convex frame 12 is ≥25°.

[0036] In order to concentrate the cutting pressure in a specific area, improve the cutting efficiency, extend the service life of the composite sheet, and thus improve the overall stability, the geometry of the non-circular convex frame 12 has also been optimized.

[0037] Example 1 of diamond composite sheet

[0038] See Figure 2 , Figure 3 The bottom of the inclined concave surface is arc-shaped, the outline of the non-circular convex frame 12 is square, and each corner extends to the periphery of the polycrystalline diamond layer to form a convex strip 18; the side cutting surfaces 16 corresponding to the upper cutting surface 15 are parallel to the projection lines of the intersection lines of the upper cutting surface 15 on the non-circular convex frame 12.

[0039] Example 2 of diamond composite sheet

[0040] See Figure 4 , Figure 5The bottom of the inclined concave surface 13 is flat; the outline of the non-circular convex frame 12 is a four-pointed star, and each corner extends to the periphery of the polycrystalline diamond layer to form a convex strip 18; the side cutting surfaces 16 corresponding to the upper cutting surface 15 intersect with the projection lines of the intersection lines of the upper cutting surface 15 on the non-circular convex frame 12.

[0041] Diamond composite sheet Example 3

[0042] See Figure 9 , Figure 10 The bottom of the inclined concave surface 13 is flat; the outline of the non-circular convex frame 12 is triangular, and each corner extends to the periphery of the polycrystalline diamond layer to form a convex strip 18; the interior of the non-circular convex frame 12 is recessed to form a second concave surface 17; the second concave surface 17 is internally connected to the non-circular convex frame 12; the side cutting surfaces 16 corresponding to the upper cutting surface 15 intersect with the projection lines of the intersection lines of the upper cutting surface 15 on the non-circular convex frame 12.

[0043] Diamond composite sheet Example 4

[0044] See Figure 11 , Figure 12 The bottom of the inclined concave surface 13 is flat; the outline of the non-circular convex frame 12 is rhomboid, the rhomboid includes obtuse angles and acute angles, and the two acute angles extend to the periphery of the polycrystalline diamond layer to form convex strips 18; the side cutting surfaces 16 corresponding to the upper cutting surface 15 intersect with the projection lines of the intersection lines of the upper cutting surface 15 on the non-circular convex frame 12.

[0045] In summary, this utility model provides a polycrystalline diamond composite sheet with an irregular structure. Through the 4D action area with a multi-faceted structure, it has excellent impact resistance and rock-breaking ability. Through the optimization of the geometry, the cutting pressure is concentrated in a specific area, which improves the cutting efficiency, extends the service life of the composite sheet, and improves the overall stability. The various structural variations can provide customers with a wider range of choices to fully adapt to the complexity of the downhole formation.

[0046] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polycrystalline diamond composite sheet with an irregular structure, the polycrystalline diamond composite sheet comprising a cemented carbide matrix and a polycrystalline diamond layer attached to the cemented carbide matrix, characterized in that, The top of the polycrystalline diamond layer is provided with a non-circular convex frame, which has at least two corners. Each corner extends towards the periphery of the polycrystalline diamond layer to form a convex strip. Adjacent convex strips are recessed at the outer edge of the polycrystalline diamond layer, so that an inclined concave surface is formed between the outer edge of the polycrystalline diamond layer and the non-circular convex frame. A cutting surface is provided at the connection between the convex strip and the side cylindrical surface of the polycrystalline diamond layer. The cutting surface includes an upper cutting surface and a side cutting surface. The upper cutting surface is located on the upper surface of the convex strip, and the side cutting surfaces are located on both sides of the convex strip, and the upper cutting surface corresponds to the side cutting surface.

2. The irregularly shaped polycrystalline diamond composite sheet as described in claim 1, characterized in that, The non-circular convex frame outline is square, or a four-pointed star, or a rhombus, or a triangle.

3. The irregularly shaped polycrystalline diamond composite sheet as described in claim 2, characterized in that, The non-circular convex frame has a second concave surface inside its recess.

4. The irregularly shaped polycrystalline diamond composite sheet as described in claim 3, characterized in that, The second concave surface is inscribed in relation to the non-circular convex frame.

5. The irregularly shaped polycrystalline diamond composite sheet as described in claim 1, characterized in that, The included angle between the upper cutting surface and the side cutting surface is ≥130°; the included angle between the two side cutting surfaces corresponding to the same upper cutting surface is ≥35°; and the included angle between the same upper cutting surface and the upper surface of the non-circular convex frame is ≥12°.

6. The irregularly shaped polycrystalline diamond composite sheet as described in claim 2, characterized in that, The bottom of the internal recess of the non-circular convex frame is either flat or curved; the depth of the internal recess of the non-circular convex frame is ≥0.2 mm.

7. The irregularly shaped polycrystalline diamond composite sheet as described in claim 1, characterized in that, The vertical distance from the center point of the top of the inclined concave surface to the non-circular convex frame is ≥1.5 mm.

8. The irregularly shaped polycrystalline diamond composite sheet as described in claim 7, characterized in that, The angle between the inclined concave surface and the non-circular convex frame is ≥25°.

9. The irregularly shaped polycrystalline diamond composite sheet as described in claim 1, characterized in that, The bottom of the inclined concave surface is either flat or curved.

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