Abrasion-resistant diamond compact for drilling

Abstract

The utility model relates to the technical field of diamond compacts, and discloses an anti-abrasion diamond compact for drilling, which comprises a hard alloy matrix and a diamond sintering layer, the top end of the hard alloy matrix is a combination head, the excircle surface of the combination head is provided with a circumferential groove, the outer surface of the combination head is provided with a plurality of first grooves, and the diamond sintering layer is arranged in the circumferential groove. Through the arrangement of the first groove, when the diamond compact is used and the corner part of the diamond sintering layer is subjected to impact force, one part of the impact force can directly act on the combination head and the hard alloy base body from the inner wall of the first groove; therefore, the hard alloy matrix can bear most impact force, the problems that after the diamond sintering layer bears the impact force, the corner part is prone to damage, and the drilling efficiency is affected are solved, and the design can disperse stress, prevent crack propagation and slow down permeation of corrosive media.

Description

Technical Field

[0001] The utility model relates to the technical field of diamond composite sheets, in particular to an anti-abrasion diamond composite sheet for drilling. Background Technique

[0002] At present, the traditional diamond composite sheet for oil drill bits consists of two parts: a cemented carbide matrix (supporting function) and a diamond layer (working layer). The cemented carbide matrix is sintered from tungsten carbide as the skeleton material and metal cobalt (generally 8-16 mass percentage).

[0003] The diamond composite sheet bit is used for drilling the exploited formation. Due to the complexity and diversity of the formation, especially the deep formation, different requirements are put forward for diamond composite sheet products. When drilling in sandstone and sandy formations, as the temperature of abrasive sand grains increases, the erosion rate of the diamond composite sheet increases to dozens or even thousands of times that at normal temperature. Coupled with the acidic environment caused by H2S and CO2 in the formation, the position where the cemented carbide matrix of the diamond composite sheet connects the working layer will be quickly eroded away, resulting in the local working layer losing support. Seriously, the corner part of the diamond sintered layer is prone to breakage probability after bearing the impact force, affecting the drilling efficiency and the service life of the drill bit. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the utility model provides an anti-abrasion diamond composite sheet for drilling, which solves the problem that the corner part of the diamond sintered layer is prone to breakage probability after bearing the impact force, affecting the drilling efficiency.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the utility model provides the following technical solution: an anti-abrasion diamond composite sheet for drilling, including a cemented carbide matrix and a diamond sintered layer. The top end of the cemented carbide matrix is a joint head, and a circumferential groove is opened on the outer circumferential surface of the joint head;

[0008] A plurality of first grooves are opened on the outer surface of the joint head, and the plurality of first grooves are uniformly arranged in a circumferential array. The first grooves are opened on the circumferential groove and intersect with it;

[0009] A passivation treatment layer for reducing the surface roughness is coated on the outer surface of the joint head, and the diamond sintered layer is integrally sintered and formed on the outer surface of the joint head;

[0010] A plurality of bottom surface grooves are integrally formed on the surface of the cemented carbide matrix away from the joint head, and the bottom surface grooves are used to improve the installation strength of the diamond composite sheet on the welded bottom surface.

[0011] Preferably, the shape of the bottom groove is a square cone surface, and a plurality of bottom grooves are uniformly arranged in a rectangular array on the lower surface of the cemented carbide substrate.

[0012] Preferably, a plurality of outer circular grooves are provided at positions close to the bottom grooves on the outer surface of the cemented carbide substrate, and the outer circular grooves are used to improve the installation strength of the diamond composite sheet on the welded outer circle.

[0013] Preferably, the outer circular groove is a cone shape with a certain draft taper between the outer circle and the end face of the cemented carbide substrate.

[0014] Preferably, an anti-corrosion coating for improving corrosion resistance is coated on the outer surface of the diamond sintered layer.

[0015] Preferably, a chamfer for facilitating installation is provided at the bottom edge position of the cemented carbide substrate.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present utility model provides an anti-abrasion diamond composite sheet for drilling, having the following beneficial effects:

[0018] 1. For the anti-abrasion diamond composite sheet for drilling, through the first groove provided, when the diamond composite sheet is in use and the corner part of the diamond sintered layer is subjected to an impact force, a part of the impact force can directly act on the joint head and the cemented carbide substrate from the inner wall of the first groove, so that the cemented carbide substrate can bear most of the impact force, which avoids the problem that the corner part of the diamond sintered layer is prone to breakage probability after bearing the impact force and affects the drilling efficiency. And this design can disperse stress, prevent crack propagation, and slow down the penetration of corrosive media.

[0019] 2. For the anti-abrasion diamond composite sheet for drilling, through the circumferential groove provided, when the diamond sintered layer is sintered and formed, the powder particles of the diamond sintered layer can enter the circumferential groove, so that after the diamond sintered layer is sintered and formed, it can achieve a good wrapping effect on the joint head through the circumferential groove, improve the integration and bonding strength between the diamond sintered layer and the joint head, enhance the bonding strength between the two, and prevent peeling during use, thereby improving the anti-abrasion property of the composite sheet.

[0020] 3. For the anti-abrasion diamond composite sheet for drilling, through the passivation treatment layer provided, the surface roughness of the joint head can be reduced, thereby further improving the connection strength between the cemented carbide substrate and the diamond sintered layer, further preventing the phenomenon of peeling and damage of the diamond sintered layer during use, and improving the wear resistance and service life of the diamond composite sheet.

[0021] 4. The anti-abrasion diamond composite sheet for drilling can enable the molten welding powder to enter the corresponding bottom grooves and outer circular grooves when the diamond composite sheet is welded and installed at the corresponding position on the drill bit through the multiple bottom grooves and multiple outer circular grooves provided. This increases the contact surface between the cemented carbide matrix and the drill bit to be installed, resulting in a higher connection strength, improving the installation strength of the diamond composite sheet, and avoiding the problem of the traditional diamond composite sheet having a smooth surface and insufficient welding strength.

[0022] 5. The anti-abrasion diamond composite sheet for drilling has a corrosion-resistant coating which is a ceramic coating. This coating can block the erosion of corrosive media on the diamond layer, extend the service life of the composite sheet, and improve the corrosion resistance and wear resistance of the composite sheet.

[0023] 6. The anti-abrasion diamond composite sheet for drilling can be easily aligned and inserted when installed into the corresponding hole position of the drill bit through the provided chamfer. This improves the welding and installation efficiency of fixing the diamond composite sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0025] Figure 2 is a schematic diagram of the relationship structure among the cemented carbide matrix, diamond sintered layer and joint of the present utility model;

[0026] Figure 3 is a schematic internal sectional view of the present utility model.

[0027] In the figure: 1. Cemented carbide matrix; 2. Diamond sintered layer; 3. Joint; 4. Circumferential groove; 5. First groove; 6. Outer circular groove; 7. Bottom groove; 8. Chamfer; 9. Corrosion-resistant coating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0029] Please refer to Figures 1-3 , the present utility model provides a new technical solution: an anti-abrasion diamond composite sheet for drilling, including a cemented carbide matrix 1 and a diamond sintered layer 2. The top end of the cemented carbide matrix 1 is a joint 3, and a circumferential groove 4 is provided on the outer circular surface of the joint 3;

[0030] Furthermore, the circumferential groove 4 is used to allow the powder particles of the diamond sintered layer 2 to enter the circumferential groove 4 during the sintering and forming of the diamond sintered layer 2, so that after the diamond sintered layer 2 is sintered and formed, it can achieve a better wrapping effect on the joint head 3 through the circumferential groove 4, improving the integration and bonding strength between the diamond sintered layer 2 and the joint head 3, enhancing the bonding strength between the two, preventing peeling during use, and thus improving the abrasion resistance of the composite sheet.

[0031] Furthermore, a plurality of first grooves 5 are formed on the outer surface of the joint head 3, and the plurality of first grooves 5 are evenly arranged in a circumferential array. The first grooves 5 are formed on the circumferential groove 4 and intersect with it;

[0032] Furthermore, when the diamond composite sheet is in use, the first groove 5 enables part of the impact force to directly act on the joint head 3 and the cemented carbide substrate 1 from the inner wall of the first groove 5 when the corner part of the diamond sintered layer 2 is subjected to an impact force. As a result, the cemented carbide substrate 1 can bear most of the impact force, avoiding the problem that the corner part of the diamond sintered layer 2 is prone to breakage after bearing the impact force, which affects the drilling efficiency. And this design can disperse stress, prevent crack propagation, and slow down the penetration of corrosive media.

[0033] Furthermore, a passivation treatment layer for reducing surface roughness is coated on the outer surface of the joint head 3, and the diamond sintered layer 2 is integrally sintered and formed on the outer surface of the joint head 3;

[0034] Furthermore, the passivation treatment layer can reduce the surface roughness of the joint head 3, thereby further improving the connection strength between the cemented carbide substrate 1 and the diamond sintered layer 2, further preventing the phenomenon of peeling and damage of the diamond sintered layer 2 during use, and improving the wear resistance and service life of the diamond composite sheet.

[0035] Furthermore, a plurality of bottom surface grooves 7 are integrally formed on the surface of the cemented carbide substrate 1 away from the joint head 3. The bottom surface grooves 7 are used to improve the installation strength of the diamond composite sheet at the welded bottom surface. The shape of the bottom surface grooves 7 is a square cone surface, and the plurality of bottom surface grooves 7 are evenly arranged in a rectangular array on the lower surface of the cemented carbide substrate 1;

[0036] Furthermore, this enables the powder metallurgy mold used in the production of the cemented carbide substrate 1 to be easily processed and the cemented carbide substrate 1 to be easily demolded.

[0037] Furthermore, a plurality of outer circular grooves 6 are formed on the outer surface of the cemented carbide substrate 1 near the position of the bottom surface grooves 7. The outer circular grooves 6 are used to improve the installation strength of the diamond composite sheet at the welded outer circle. The outer circular grooves 6 are conical with a certain draft taper between the outer circle and the end face of the cemented carbide substrate 1;

[0038] Furthermore, this enables the hard alloy substrate 1 to be easily formed and demolded during production, and multiple outer circular grooves 6 are evenly arranged in a circumferential array.

[0039] Furthermore, by providing multiple bottom grooves 7 and multiple outer circular grooves 6, when the diamond composite sheet is welded and installed at the corresponding position on the drill bit, the melted welding powder can enter the corresponding bottom grooves 7 and outer circular grooves 6. This increases the contact surface between the hard alloy substrate 1 and the installed drill bit, resulting in a higher connection strength, improving the installation strength of the diamond composite sheet, and avoiding the problems of the traditional diamond composite sheet having a smooth surface and insufficient welding strength.

[0040] Furthermore, the outer surface of the diamond sintered layer 2 is coated with an anti-corrosion coating 9 for improving corrosion resistance;

[0041] Furthermore, the anti-corrosion coating 9 is a ceramic coating. This coating can block the erosion of corrosive media on the diamond layer, extend the service life of the composite sheet, and improve the corrosion resistance and wear resistance of the composite sheet.

[0042] Furthermore, a chamfer 8 is provided at the bottom edge position of the hard alloy substrate 1 to facilitate installation;

[0043] Furthermore, the chamfer 8 can facilitate alignment and insertion when the diamond composite sheet is installed into the corresponding hole position of the drill bit, which improves the welding and installation efficiency of fixing the diamond composite sheet.

[0044] Working principle: The circumferential groove 4 is provided for the powder particles of the diamond sintered layer 2 to enter the circumferential groove 4 during the sintering and forming of the diamond sintered layer 2, so that after the diamond sintered layer 2 is sintered and formed, it can achieve a better wrapping effect on the joint head 3 through the circumferential groove 4, improving the integration and bonding strength of the diamond sintered layer 2 and the joint head 3, enhancing the bonding strength between the two, and preventing peeling during use, thereby improving the abrasion resistance of the composite sheet.

[0045] By providing the first groove 5, when the diamond composite sheet is in use and the corner part of the diamond sintered layer 2 is subjected to an impact force, a part of the impact force can directly act on the joint head 3 and the hard alloy substrate 1 from the inner wall of the first groove 5, so that the hard alloy substrate 1 can bear most of the impact force. This avoids the problem that the corner part of the diamond sintered layer 2 is prone to breakage after bearing the impact force, affecting the drilling efficiency. And this design can disperse stress, prevent crack propagation, and slow down the penetration of corrosive media.

[0046] The passivation treatment layer provided can reduce the surface roughness of the joint head 3, thereby further improving the connection strength between the cemented carbide substrate 1 and the diamond sintered layer 2, further preventing the diamond sintered layer 2 from peeling and damaging during use, and improving the wear resistance and service life of the diamond composite sheet.

[0047] The multiple bottom grooves 7 and multiple outer circular grooves 6 provided enable the melted welding powder to enter the corresponding bottom grooves 7 and outer circular grooves 6 when the diamond composite sheet is welded and installed at the corresponding position on the drill bit. This increases the contact surface between the cemented carbide substrate 1 and the installed drill bit, resulting in a higher connection strength, improving the installation strength of the diamond composite sheet, and avoiding the problem of insufficient welding strength due to the smooth surface of the traditional diamond composite sheet.

[0048] The anti-corrosion coating 9 provided is a ceramic coating, which can block the erosion of corrosive media on the diamond layer, extend the service life of the composite sheet, and improve the corrosion resistance and wear resistance of the composite sheet.

[0049] The chamfer 8 provided facilitates alignment and insertion when the diamond composite sheet is installed into the corresponding hole position of the drill bit, which improves the welding installation efficiency of fixing the diamond composite sheet.

[0050] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-abrasion diamond composite sheet for drilling, characterized in that: It comprises a cemented carbide substrate (1) and a diamond sintered layer (2), the top of the cemented carbide substrate (1) is a bonding head (3), and a circumferential groove (4) is provided on the outer circumferential surface of the bonding head (3); The outer surface of the bonding head (3) is provided with a plurality of first grooves (5), the plurality of first grooves (5) are evenly arranged in a circumferential array, and the first grooves (5) are provided on the circumferential groove (4) and intersect therewith; The outer surface of the bonding head (3) is coated with a passivation treatment layer for reducing surface roughness, and the diamond sintered layer (2) is integrally sintered and formed on the outer surface of the bonding head (3); A plurality of bottom surface grooves (7) are integrally formed on a surface of the cemented carbide substrate (1) away from the bonding head (3), and the bottom surface grooves (7) are used to improve the installation strength of the diamond composite sheet on the welding bottom surface.

2. The anti-abrasion diamond composite sheet for drilling according to claim 1, characterized in that: The bottom surface groove (7) is in the shape of a square cone, and a plurality of bottom surface grooves (7) are evenly arranged in a rectangular array on the lower surface of the cemented carbide substrate (1).

3. The anti-abrasion diamond composite sheet for drilling according to claim 2, characterized in that: The outer surface of the cemented carbide substrate (1) is provided with a plurality of outer circular grooves (6) near the bottom surface groove (7), and the outer circular grooves (6) are used to improve the installation strength of the diamond composite sheet on the welding outer circle.

4. The anti-abrasion diamond composite sheet for drilling according to claim 3, characterized in that: The outer circular groove (6) is tapered with a certain draft taper between the outer circle and the end surface of the cemented carbide substrate (1).

5. The anti-abrasion diamond composite sheet for drilling according to claim 1, characterized in that: The outer surface of the diamond sintered layer (2) is coated with an anti-corrosion coating (9) for improving corrosion resistance.

6. The anti-abrasion diamond composite sheet for drilling according to claim 1, characterized in that: The bottom edge of the cemented carbide substrate (1) is provided with a chamfer (8) which is convenient for installation.

Images