Polycrystalline diamond compact substrate

Abstract

The utility model relates to a polycrystalline diamond compact substrate. The outer edge of the top of the polycrystalline diamond compact base body extends upwards to form an annular protrusion. The outer side face of the annular protrusion is flush with the outer side face of the polycrystalline diamond compact base body. A material containing groove matched and corresponding to the polycrystalline diamond layer is formed in the inner area of the annular bulge; the depth of the material containing groove is matched with the thickness of the polycrystalline diamond layer. The annular protrusion replaces the outer side face of the polycrystalline diamond layer to be connected with the drill bit body in a brazed mode, it can be guaranteed that no gap exists between the polycrystalline diamond compact and the drill bit body, edge collapse of the polycrystalline diamond layer is avoided, and the service life of the gauge protection structure is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of diamond, and in particular to a polycrystalline diamond composite substrate. Background Technology

[0002] Polycrystalline diamond composite sheets are typically composed of a polycrystalline diamond layer (03) and a cemented carbide matrix (04), and are widely used in PDC drill bits for oil and natural gas extraction. See also Figure 1 The crown of the PDC drill bit, including cutting teeth 01 and gauge protection structure 02, is made of polycrystalline diamond composite material. See also Figure 2 Unlike the cutting tooth 01, the gauge protection structure 02 is nested on the side of the drill body 05; the polycrystalline diamond layer 03 of the gauge protection structure 02 should not extend beyond the side of the drill body 05. In conventional gauge protection structures 02, the polycrystalline diamond layer 03 and the cemented carbide substrate 04 need to be soldered to the drill body 05. However, the polycrystalline diamond layer 03 does not wet with conventional solder. During soldering, the polycrystalline diamond layer 03 cannot adhere to the solder. Gaps will appear between the polycrystalline diamond layer 03 in the gauge protection structure 02 and the drill body 05; the outer edge of the polycrystalline diamond layer 03 is prone to chipping under external pressure, causing premature failure of the gauge protection structure 02. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a polycrystalline diamond composite substrate.

[0004] The technical solution of this utility model is as follows: A polycrystalline diamond composite substrate has an annular protrusion extending upward from the outer edge of its top; the outer side of the annular protrusion is aligned with the outer side of the polycrystalline diamond composite substrate; the inner area of ​​the annular protrusion is a material-holding groove that matches the polycrystalline diamond layer and is used to hold polycrystalline diamond powder; the depth of the material-holding groove matches the thickness of the polycrystalline diamond layer; the polycrystalline diamond powder in the material-holding groove will not be too high above the annular protrusion; after the polycrystalline diamond composite substrate holds the polycrystalline diamond powder, it is composited into a polycrystalline diamond composite sheet through high temperature and high pressure; the annular protrusion replaces the outer side of the polycrystalline diamond layer and is brazed to the drill bit body, which can ensure that there is no gap between the polycrystalline diamond composite sheet and the drill bit body, avoid the edge of the polycrystalline diamond layer from chipping, and extend the service life of the gauge protection structure.

[0005] Preferably, the thickness of the polycrystalline diamond layer is 0.5~4mm, which is a commonly used size for the polycrystalline diamond layer of PDC drill bits; the depth of the material reservoir is 0.3~5mm, and is set accordingly.

[0006] Preferably, the horizontal cross-section of the material trough is circular, and the resulting polycrystalline diamond layer is disc-shaped, reducing the sharp edges at the outer end of the polycrystalline diamond layer and ensuring the diameter retention effect of the diameter retention structure.

[0007] Preferably, the material trough and the annular protrusion are coaxially arranged to ensure that the polycrystalline diamond layer is worn evenly and to guarantee the service life of the gauge protection structure.

[0008] Preferably, the top outer edge is provided with a chamfered edge; during brazing, the chamfered edge can fill more brazing material, improving the connection strength between the polycrystalline diamond composite substrate and the drill bit body.

[0009] Preferably, the bottom outer edge is provided with a chamfer B to facilitate embedding into the side of the drill bit body.

[0010] Preferably, the bottom of the material container is densely covered with several small protrusions to improve the bonding ability between the polycrystalline diamond composite substrate and the polycrystalline diamond layer.

[0011] Furthermore, the small protrusions include regular polygonal bosses, which increase the contact area between the material container and the polycrystalline diamond powder, and improve the bonding ability with the polycrystalline diamond layer.

[0012] Furthermore, the regular polygonal boss is a regular square boss, which is easy to process and shape.

[0013] Furthermore, the small protrusions also include semi-regular polygonal bosses; these semi-regular polygonal bosses are distributed along the bottom edge of the material storage tank, making full use of the bottom area of ​​the material storage tank and improving the bonding ability with the polycrystalline diamond layer.

[0014] The beneficial effects of this utility model are as follows: The polycrystalline diamond composite sheet matrix of this utility model has the following advantages:

[0015] (1) The annular protrusion of this utility model replaces the outer side of the polycrystalline diamond layer and is brazed to the drill bit body, which can ensure that there is no gap between the polycrystalline diamond composite sheet and the drill bit body, avoid the edge of the polycrystalline diamond layer from chipping, and extend the service life of the gauge protection structure.

[0016] (2) The chamfered plate of this utility model can be filled with more brazing material, thereby improving the connection strength between the polycrystalline diamond composite substrate and the drill bit body. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an existing gauge-maintaining drill bit;

[0018] Figure 2 yes Figure 1 Radial sectional view;

[0019] Figure 3 This is a perspective view of the polycrystalline diamond composite substrate of this invention in Embodiment 1;

[0020] Figure 4 This is a perspective view of the polycrystalline diamond composite substrate of this invention in Embodiment 2;

[0021] Figure 5 yes Figure 4 Top view;

[0022] In the diagram: 01. Cutting teeth, 02. Gauge protection structure, 03. Polycrystalline diamond layer, 04. Carbide matrix, 05. Drill body, 1. Annular protrusion, 2. Material trough, 3. Chamfer A, 4. Chamfer B, 51. Regular polygonal boss, 52. Semi-regular polygonal boss. Detailed Implementation

[0023] Example 1: See Figure 3 An annular protrusion 1 extends upward from the outer edge of the top of a polycrystalline diamond composite substrate. The outer surface of the annular protrusion 1 is aligned with the outer surface of the polycrystalline diamond composite substrate. The inner area of ​​the annular protrusion 1 is a material-holding groove 2 that matches the polycrystalline diamond layer 03, used to hold polycrystalline diamond powder. The depth of the material-holding groove 2 matches the thickness of the polycrystalline diamond layer 03. The polycrystalline diamond powder in the material-holding groove 2 will not be too high above the annular protrusion 1. After the polycrystalline diamond composite substrate holds the polycrystalline diamond powder, it is composited into a polycrystalline diamond composite sheet through high temperature and high pressure. The annular protrusion 1 replaces the outer surface of the polycrystalline diamond layer 03 and is brazed to the drill bit body 05, which can ensure that there is no gap between the polycrystalline diamond composite sheet and the drill bit body 05, avoid the edge of the polycrystalline diamond layer 03 from chipping, and extend the service life of the gauge protection structure 02.

[0024] Compared with the prior art, the annular protrusion 1 of this utility model replaces the outer side of the polycrystalline diamond layer 03 and is brazed to the drill bit body 05, which can ensure that there is no gap between the polycrystalline diamond composite sheet and the drill bit body 05, avoid the edge of the polycrystalline diamond layer 03 from chipping, and extend the service life of the gauge protection structure 02.

[0025] The thickness of the polycrystalline diamond layer 03 is 0.5~4mm, which is a commonly used size for the polycrystalline diamond layer 03 of PDC drill bits; the depth of the material reservoir 2 is 0.3~5mm, and is set accordingly. In this embodiment, the polycrystalline diamond layer 03 is 0.5mm, and the depth of the material reservoir 2 is 0.3mm.

[0026] The horizontal cross-section of the material container 2 is circular, and the resulting polycrystalline diamond layer 03 is disc-shaped, reducing the sharp edges at the outer end of the polycrystalline diamond layer 03 and ensuring the diameter retention effect of the diameter retention structure 02.

[0027] The material trough 2 is coaxially arranged with the annular protrusion 1, so that the polycrystalline diamond layer 03 is worn evenly, ensuring the service life of the diameter-maintaining structure 02.

[0028] The top outer edge is provided with a chamfered edge 3; during brazing, the chamfered edge 3 can fill more brazing material, improving the connection strength between the polycrystalline diamond composite substrate and the drill bit body 05.

[0029] The bottom outer edge is chamfered (B4) to facilitate insertion into the side of the drill bit body (O5).

[0030] The working principle of this embodiment is as follows: The material container 2 is used to hold polycrystalline diamond powder; after the polycrystalline diamond composite sheet substrate holds the polycrystalline diamond powder, it is composited into a polycrystalline diamond composite sheet through high temperature and high pressure; the annular protrusion 1 replaces the outer side of the polycrystalline diamond layer 03 and is brazed to the drill bit body 05, which can ensure that there is no gap between the polycrystalline diamond composite sheet and the drill bit body 05, avoid the edge chipping of the polycrystalline diamond layer 03, and extend the service life of the gauge protection structure 02. The polycrystalline diamond layer 03 is disc-shaped, reducing the sharp edges of the outer end of the polycrystalline diamond layer 03 and ensuring the gauge protection effect of the gauge protection structure 02. During brazing, the chamfer A 3 can fill more brazing material, improving the connection strength between the polycrystalline diamond composite sheet substrate and the drill bit body 05. The chamfer B 4 can be easily embedded into the side of the drill bit body 05.

[0031] Example 2: See Figure 4-5 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the bottom of the material tank 2 is densely covered with several small protrusions to improve the bonding ability between the polycrystalline diamond composite substrate and the polycrystalline diamond layer 03.

[0032] The small protrusions include polygonal bosses 51, which increase the contact area between the material reservoir 2 and the polycrystalline diamond powder, and improve the bonding ability with the polycrystalline diamond layer 03. In this embodiment, there are 16 polygonal bosses 51.

[0033] The regular polygonal boss 51 is a regular square-sided boss, which is easy to process and form.

[0034] The small protrusions also include semi-regular polygonal protrusions 52; these semi-regular polygonal protrusions 52 are distributed along the bottom edge of the material storage tank 2, making full use of the bottom area of ​​the material storage tank 2 and improving the bonding ability with the polycrystalline diamond layer 03. In this embodiment, there are 8 semi-regular polygonal protrusions 52.

Claims

1. A polycrystalline diamond composite sheet matrix, characterized in that, An annular protrusion extends upward from the top outer edge; the outer side of the annular protrusion is aligned with the outer side of the polycrystalline diamond composite substrate; the inner area of ​​the annular protrusion is a material-holding groove that matches the polycrystalline diamond layer; the depth of the material-holding groove matches the thickness of the polycrystalline diamond layer.

2. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The thickness of the polycrystalline diamond layer is 0.5~4mm; the depth of the material container is 0.3~5mm.

3. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The horizontal cross-section of the material trough is circular.

4. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The material trough and the annular protrusion are coaxially arranged.

5. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The top outer edge is fitted with a chamfered plate.

6. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The bottom outer edge is chamfered.

7. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The bottom of the material trough is covered with several small protrusions.

8. The polycrystalline diamond composite substrate according to claim 7, characterized in that: Small protrusions include regular polygonal bosses.

9. The polycrystalline diamond composite substrate according to claim 8, characterized in that: The small protrusion also includes a semi-regular polygonal boss; the semi-regular polygonal boss is distributed along the bottom edge of the material trough.

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