A diamond compact

Abstract

The application relates to a diamond compact, belonging to the technical field of drilling. The diamond compact comprises a diamond composite layer and a locking shaft. The diamond composite layer is a hollow structure, and a hard alloy base is arranged at the lower end of the diamond composite layer. The central position of the hard alloy base is partially or entirely hollow along the axial direction. The locking shaft is rotationally connected in the diamond composite layer and the hard alloy base, and the locking shaft is provided with a locking piece for axially positioning the locking shaft on the diamond composite layer and the hard alloy base. The relative rotation between the locking shaft and the diamond composite layer and the hard alloy base is low in rotation speed, and the heat generated by friction is reduced, so that the wear degree between the locking shaft and the diamond composite layer and the hard alloy base is reduced, and the service life of the whole diamond compact is prolonged.

Description

Technical Field

[0001] This application relates to the field of drilling technology, and in particular to a diamond composite sheet. Background Technology

[0002] Since the 1980s, diamond drill bits have been widely used in oil and gas drilling projects. Diamond drill bits are classified into three categories based on their cutting elements: PDC (polycrystalline diamond) drill bits, TSP (thermally stabilized polycrystalline diamond) drill bits, and natural diamond drill bits. PDC drill bits are mainly used for drilling in soft to medium-hard formations. Through continuous technological advancements, the application range of PDC drill bits has become increasingly wider, offering good economic value. TSP drill bits are mainly used for drilling in medium-hard to extremely hard formations. Currently, deep well operations are gradually increasing in oil and gas drilling projects, and the formations encountered are becoming increasingly complex.

[0003] When drilling into highly abrasive formations, existing drill bit cutting elements are fixed as a single piece to the drill bit. The cutting edge of the cutting element is always in contact with the formation, and the friction between the cutting edge and the rock generates a large amount of heat, leading to heat accumulation. This heat accumulation causes a decline in the performance of the diamond composite sheet, shortening its service life. Therefore, it is necessary to design a diamond composite sheet with a longer service life. Summary of the Invention

[0004] This application provides a diamond composite sheet to solve the problem of short service life of diamond composite sheets in related technologies.

[0005] This application provides a diamond composite sheet, comprising:

[0006] A diamond composite layer, wherein the diamond composite layer has a hollow structure and a cemented carbide substrate is provided at its lower end, and the center of the cemented carbide substrate is partially or completely hollow along the axial direction.

[0007] A locking shaft is rotatably connected to the diamond composite layer and the cemented carbide matrix, and the locking shaft is provided with a locking element that axially positions the locking shaft on the diamond composite layer and the cemented carbide matrix.

[0008] In some embodiments, a first groove is provided on the locking shaft, and a second groove is provided on the cemented carbide substrate that is recessed outward from the cemented carbide substrate. The second groove and the first groove are located on the same horizontal plane, and the locking member is located between the first groove and the second groove.

[0009] In some embodiments, the locking element is a snap ring, a retaining ring, or a disc washer, and the locking shaft is made of cemented carbide and / or diamond composite material.

[0010] In some embodiments, the arc and angle of the locking shaft around its perimeter match the arc and angle of the inner wall of the diamond composite layer, and the locking shaft is a conical structure, a stepped cylindrical structure, or an arc transition structure.

[0011] In some embodiments, the top surface of the diamond composite layer is a planar structure or a non-planar structure, and the top end of the locking shaft is higher or lower than the diamond composite layer, or flush with the top end of the diamond composite layer.

[0012] In some embodiments, a plug pin hole is provided on the outer side of the cemented carbide substrate for the plug pin to pass through, and the locking member is a locking steel ball, which is placed in the plug pin hole and the plug pin is used to seal the plug pin hole.

[0013] In some embodiments, the diamond composite layer includes a diamond layer and a cemented carbide layer located at its lower end and connected thereto.

[0014] In some embodiments, the diamond layer is a polycrystalline diamond layer or a thermally stabilized polycrystalline diamond layer.

[0015] In some embodiments, the locking shaft passes sequentially through the diamond composite layer and the cemented carbide substrate, with the bottom of the locking shaft extending beyond the bottom of the cemented carbide substrate.

[0016] In some embodiments, a cemented carbide base is provided at one end of the cemented carbide substrate away from the diamond composite layer, and the top end of the cemented carbide base is provided with a recess that matches the bottom end of the locking shaft.

[0017] The beneficial effects of the technical solution provided in this application include:

[0018] This application provides a diamond composite sheet. The diamond composite sheet includes a diamond composite layer and a locking shaft. The diamond composite layer has a hollow structure with a cemented carbide substrate at its lower end. The center of the cemented carbide substrate is partially or completely hollow along the axial direction. The locking shaft is rotatably connected to the diamond composite layer and the cemented carbide substrate, and the locking shaft is provided with a locking element that axially positions the locking shaft on the diamond composite layer and the cemented carbide substrate.

[0019] The relative rotation between the locking shaft and the diamond composite layer and the cemented carbide matrix, and the relatively low rotation speed of the locking shaft, reduces the frictional force between the locking shaft and the diamond composite layer and the cemented carbide matrix, and reduces the heat generated by friction. This slows down the wear between the locking shaft and the diamond composite layer and the cemented carbide matrix, improves the service life of the locking shaft bearing, and thus increases the service life of the entire diamond composite sheet.

[0020] Therefore, the diamond composite sheet of this application has the characteristic of a long service life. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a top view of a diamond composite sheet provided in an embodiment of this application;

[0023] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0024] Figure 3 for Figure 2 A three-dimensional view of a medium diamond composite layer;

[0025] Figure 4 for Figure 2 Cross-sectional view of a medium diamond composite layer;

[0026] Figure 5 for Figure 2 3D view of a medium-hard alloy matrix;

[0027] Figure 6 for Figure 2 Cross-sectional view of a medium-hard alloy matrix;

[0028] Figure 7 for Figure 2 A three-dimensional view of the central locking shaft;

[0029] Figure 8 for Figure 2 A cross-sectional view of the central locking shaft;

[0030] Figure 9 for Figure 2 Schematic diagram of the locking component;

[0031] Figure 10 This is a cross-sectional view of a diamond composite sheet in one embodiment;

[0032] Figure 11 This is a cross-sectional view of a diamond composite sheet in one embodiment;

[0033] Figure 12 This is a cross-sectional view of a diamond composite sheet in one embodiment;

[0034] Figure 13 This is a cross-sectional view of a diamond composite sheet in one embodiment;

[0035] Figure 14 This is a cross-sectional view of a diamond composite sheet in one embodiment;

[0036] Figure 15 for Figure 14 Schematic diagram of the locking component;

[0037] Figure 16 This is a cross-sectional view of a diamond composite sheet in one embodiment;

[0038] Figure 17 This is a cross-sectional view of a diamond composite sheet in one embodiment;

[0039] Figure 18 This is a cross-sectional view of a diamond composite sheet in one embodiment.

[0040] Figure label:

[0041] 101, Diamond composite layer; 101a, Diamond layer; 101b, Hard alloy layer; 102, Hard alloy substrate; 102c, Second groove; 103, Locking shaft; 103c, First groove; 104, Locking element; 105, Hard alloy base; 106, Plug pin. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] This application provides a diamond composite sheet that can solve the problem of short service life of diamond composite sheets.

[0044] See Figures 1 to 9 As shown, this application embodiment provides a diamond composite sheet, including: a diamond composite layer 101 and a locking shaft 103. The diamond composite layer 101 has a hollow structure, and a cemented carbide substrate 102 is provided at its lower end. The center of the cemented carbide substrate 102 is partially or completely hollow along the axial direction. The locking shaft 103 is rotatably connected to the diamond composite layer 101 and the cemented carbide substrate 102, and a locking member 104 is provided on the locking shaft 103 to axially position the locking shaft 103 on the diamond composite layer 101 and the cemented carbide substrate 102.

[0045] The diamond composite layer 101 of the diamond composite sheet has a hollow structure. The center of the cemented carbide substrate 102 can be partially or completely hollow. When the center of the cemented carbide substrate 102 is partially hollow, that is, the locking shaft 103 does not penetrate the entire cemented carbide substrate 102, a first groove 103c is formed on the locking shaft 103, and a second groove 102c is formed on the cemented carbide substrate 102 that is recessed to the outside of the cemented carbide substrate 102. The second groove 102c and the first groove 103c are located on the same horizontal plane, and the locking member 104 is located between the first groove 103c and the second groove 102c.

[0046] See Figure 2 , Figure 9 and Figure 15 As shown, this application embodiment provides a diamond composite sheet, wherein the diamond composite layer 101 includes a diamond layer 101a and a cemented carbide layer 101b located at its lower end and connected thereto. The locking member 104 is a snap ring, a spring retaining ring, or a disc washer, such as... Figure 9 As shown, the locking element 104 is a snap ring; as Figure 15 As shown, the locking element 104 is an elastic retaining ring. During cutting, a small gap is maintained between the diamond composite layer 101 and the locking shaft 103. When the diamond composite layer 101 and the cemented carbide substrate 102 rotate, the locking shaft 103 rotates relative to the diamond composite layer 101 and the cemented carbide substrate 102. Since the locking shaft 103 rotates under the drive of the diamond composite layer 101 and the cemented carbide substrate 102, the rotation speed of the locking shaft 103 is slower than that of the diamond composite layer 101 and the cemented carbide substrate 102.

[0047] At this time, the locking shaft 103 rotates relative to the diamond composite layer 101 and the cemented carbide substrate 102, and the rotation speed of the locking shaft 103 is low. This reduces the friction between the locking shaft 103 and the diamond composite layer 101 and the cemented carbide substrate 102, and reduces the heat generated by friction. This slows down the wear between the locking shaft 103 and the diamond composite layer 101 and the cemented carbide substrate 102, improves the service life of the locking shaft 103 bearing, and thus increases the service life of the entire diamond composite sheet.

[0048] In some applications, the locking shaft 103 is made of a composite material of cemented carbide and / or diamond. The locking shaft 103 can be made of cemented carbide or diamond alone, or a composite material of cemented carbide and diamond. The diamond layer 101a can be a polycrystalline diamond layer 101a or a heat-stabilized polycrystalline diamond layer 101a.

[0049] See Figures 10 to 16As shown, in actual use, the arc and angle of the locking shaft 103 around its perimeter match the arc and angle of the inner wall of the diamond composite layer 101, and the locking shaft 103 is a conical structure, a stepped cylindrical structure, or an arc transition structure.

[0050] See Figure 10 , Figure 11 As shown, in some applications, the top surface of the diamond composite layer 101 is either planar or non-planar, and the top of the locking shaft 103 is higher or lower than the diamond composite layer 101, or flush with the top of the diamond composite layer 101. When the top of the locking shaft 103 is higher than the top of the diamond composite layer 101, the cutting efficiency can be increased; when the top of the locking shaft 103 is flush with or lower than the top of the diamond composite layer 101, the friction between the locking shaft 103 and the diamond composite layer 101 and the cemented carbide substrate 102 is reduced, the heat generated by friction is reduced, the cooling rate is accelerated, and the service life of the diamond composite sheet is improved.

[0051] See Figure 13 As shown in the embodiment of this application, a diamond composite sheet is provided. In some applications, a plug pin 106 hole is provided on the outer side of the cemented carbide substrate 102 for the plug pin 106 to pass through. The locking member 104 is a locking steel ball, which is placed in the plug pin 106 hole and the plug pin 106 hole is sealed by the plug pin 106. This ensures that the locking shaft 103 rotates relative to the diamond composite layer 101 and the cemented carbide substrate 102.

[0052] See Figure 17 , Figure 18 As shown, in some applications, the locking shaft 103 passes sequentially through the diamond composite layer 101 and the cemented carbide substrate 102, with the bottom of the locking shaft 103 extending beyond the bottom of the cemented carbide substrate 102. In this case, the locking member 104 is located below the cemented carbide substrate 102. Specifically, another cemented carbide base 105 is provided at the end of the cemented carbide substrate 102 away from the diamond composite layer 101, and the top of the cemented carbide base 105 has a recess that matches the bottom end of the locking shaft 103.

[0053] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0054] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A diamond composite sheet, characterized in that, include: A diamond composite layer (101) is a hollow structure, and a cemented carbide substrate (102) is provided at its lower end. The center of the cemented carbide substrate (102) is partially or completely hollow along the axial direction. A locking shaft (103) is rotatably connected within the diamond composite layer (101) and the cemented carbide substrate (102), and a locking element (104) is provided on the locking shaft (103) to axially position the locking shaft (103) on the diamond composite layer (101) and the cemented carbide substrate (102). The top end of the locking shaft (103) is flush with or lower than the top end of the diamond composite layer (101).

2. The diamond composite sheet as described in claim 1, characterized in that: The locking shaft (103) has a first groove (103c), and the cemented carbide substrate (102) has a second groove (102c) recessed outward from the cemented carbide substrate (102). The second groove (102c) and the first groove (103c) are located on the same horizontal plane, and the locking member (104) is located between the first groove (103c) and the second groove (102c).

3. A diamond composite sheet as described in claim 1 or 2, characterized in that: The locking component (104) is a snap ring, a retaining ring, or a disc washer, and the locking shaft (103) is made of hard alloy and / or diamond composite material.

4. A diamond composite sheet as described in claim 1, characterized in that: The arc and angle of the locking shaft (103) around its perimeter match the arc and angle of the inner wall of the diamond composite layer (101), and the locking shaft (103) is a conical structure, a stepped cylindrical structure, or an arc transition structure.

5. A diamond composite sheet as described in claim 1, characterized in that: The top surface of the diamond composite layer (101) can be a planar structure or a non-planar structure.

6. A diamond composite sheet as described in claim 1, characterized in that: The hard alloy substrate (102) has a plug hole on its outer side for the plug pin (106) to pass through. The locking member (104) is a locking steel ball. The locking steel ball is placed in the plug hole and the plug hole is blocked by the plug pin (106).

7. A diamond composite sheet as described in claim 1, characterized in that: The diamond composite layer (101) includes a diamond layer (101a) and a cemented carbide layer (101b) located at its lower end and connected thereto.

8. A diamond composite sheet as described in claim 7, characterized in that: The diamond layer (101a) is a polycrystalline diamond layer or a thermally stable polycrystalline diamond layer.

9. A diamond composite sheet as described in claim 1, characterized in that: The locking shaft (103) passes through the diamond composite layer (101) and the cemented carbide substrate (102) in sequence, and the bottom of the locking shaft (103) extends out of the bottom of the cemented carbide substrate (102).

10. A diamond composite sheet as described in claim 9, characterized in that: The cemented carbide substrate (102) is provided with a cemented carbide base (105) at one end away from the diamond composite layer (101), and the top end of the cemented carbide base (105) is provided with a recess that matches the bottom end of the locking shaft (103).

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