A diamond compact

Abstract

The application relates to a diamond compact which comprises a sleeve, a movable assembly and a locking assembly, the sleeve comprises an upper base and a lower base, the upper base is open at both ends, the lower base is open at one end and sealed at the other end, and the upper base is fixed to the open end of the lower base; one end of the movable assembly extends into the opening of the lower base from the opening of the upper base; the locking assembly is sleeved on the outer peripheral surface of the movable assembly, and the movable assembly is connected with the inside of the sleeve through the locking assembly. Since the deeper the hole is, the more difficult the processing is and the more difficult the processing precision is to guarantee, in the application, the sleeve is arranged as a combined sleeve, the upper base and the lower base can be respectively opened when the sleeve is opened, the opening depth is reduced when the sleeve is opened, the processing difficulty is reduced, and the processing precision of the sleeve is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drill bits, in particular to a diamond compact. BACKGROUND

[0002] Since the 1980s, diamond drill bits have been widely used in oil and gas drilling engineering. Diamond drill bits are divided into three categories according to cutting elements: PDC (polycrystalline diamond) drill bits, TSP (thermally stable polycrystalline diamond) drill bits, and natural diamond drill bits. PDC drill bits are mainly used for drilling in soft to medium-hard formations. With continuous technological progress, the application range of PDC drill bits is becoming wider and wider, and they have good economic value. TSP drill bits are mainly used for drilling in medium-hard to extremely hard formations. At present, deep well operations are gradually increasing in oil and gas drilling engineering, and the formations drilled are becoming more and more complex.

[0003] When drilling in formations with strong abrasiveness, conventional PDC drill bits have diamond compacts fixed integrally on the drill bit, so that the cutting edge of the diamond compact is always in contact with the formation. The cutting edge and the rock generate a large amount of heat through friction, resulting in heat accumulation, which can cause the performance of the compact to degrade. To address this problem, a diamond compact that can rotate around the central axis of the diamond compact is provided in the prior art. The diamond compact is provided with a sleeve open at the tail, a retaining ring, and a rotatable cutting element. The sleeve is installed on the drill bit body, and the rotatable cutting element is fixed in the sleeve and can rotate relative to the sleeve. This effectively solves the problem of the compact cutting into the formation for a long time, but the tail of the compact is open, which can cause the solder to flow into the rotating shaft during welding, causing the rotating shaft to be welded and fixed. In addition, the sleeve is made of superhard material, and the internal structure of the sleeve is difficult to process, which makes the industrial implementation poor. SUMMARY

[0004] The embodiments of the present application provide a diamond compact to solve the problem that the material of the sleeve in the diamond compact has extremely high hardness, the internal structure of the sleeve is difficult to process, and the industrial implementation is poor in the related art.

[0005] To achieve the above object, the present application provides the following technical scheme: a diamond compact, comprising: a sleeve, a movable assembly and a locking assembly, the sleeve comprises an upper base and a lower base, the upper base is open at both ends, the lower base is open at one end and sealed at the other end, and the upper base is fixed to the open end of the lower base; one end of the movable assembly extends into the opening of the lower base from the opening of the upper base; the locking assembly is sleeved on the outer peripheral surface of the movable assembly, and the movable assembly is connected with the inside of the sleeve through the locking assembly.

[0006] In some embodiments, the upper base and the lower base are welded together; the lower base has an annular protrusion at one end of the opening; and the upper base has a groove at one end of the opening, which matches the annular protrusion.

[0007] In some embodiments, the movable assembly comprises a diamond composite layer, a base and a rotating shaft, the base is fixed to one end of the diamond composite layer; the rotating shaft is fixed to one end of the base, and the rotating shaft extends into the opening of the lower base from the opening of the upper base.

[0008] In some embodiments, the rotating shaft has a second locking groove on the outer circumferential surface for accommodating the locking assembly.

[0009] In some embodiments, the other end of the diamond composite layer protrudes away from the end of the base, forming a tapered structure.

[0010] In some embodiments, the upper base and / or the lower base has a first locking groove on the inner wall for accommodating the locking assembly.

[0011] In some embodiments, the first locking groove has a depth greater than the thickness of the locking assembly.

[0012] In some embodiments, the diamond composite piece further comprises a damping assembly, which is arranged between the sleeve and the movable assembly.

[0013] In some embodiments, the damping assembly comprises a disc spring, which is arranged inside the lower base, one end of the disc spring is in contact with the bottom of the inner wall of the lower base, and the other end is in contact with the movable assembly.

[0014] In some embodiments, the damping assembly comprises an elastic washer, which is sleeved on the outer circumferential surface of the movable assembly, one end of the elastic washer is arranged at the end of the upper base away from the lower base.

[0015] The technical scheme provided by the present application has the following beneficial effects:

[0016] The diamond composite piece provided by the embodiments of the present application has the following advantages: since the deeper the hole is, the more difficult it is to process and the more difficult it is to ensure the processing precision, the sleeve is arranged as a combined sleeve in the present application, the upper base and the lower base are respectively drilled when the sleeve is drilled, which reduces the depth of the drilling and the difficulty of processing and improves the processing precision of the sleeve; the lower base has an opening at one end and is sealed at the other end, which further reduces the depth of the drilling, and since the other end of the lower base is sealed, the brazing material does not flow into the inside of the lower base when the lower base is welded to the drill bit, so that the movable assembly is not welded and fixed, thereby reducing the process difficulty of installing the diamond composite piece on the drill bit. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Figure 1 The first diamond compact semi-diagram provided by the embodiments of the present application;

[0019] Figure 2 The first diamond compact explosion diagram provided by the embodiments of the present application;

[0020] Figure 3 The second diamond compact semi-diagram provided by the embodiments of the present application;

[0021] Figure 4 The second diamond compact locking assembly diagram provided by the embodiments of the present application;

[0022] Figure 5 The third diamond compact semi-diagram provided by the embodiments of the present application;

[0023] Figure 6 The fourth diamond compact semi-diagram provided by the embodiments of the present application;

[0024] Figure 7 The fifth diamond compact semi-diagram provided by the embodiments of the present application;

[0025] Figure 8 The sixth diamond compact semi-diagram provided by the embodiments of the present application;

[0026] Figure 9 The seventh diamond compact semi-diagram provided by the embodiments of the present application.

[0027] In the figure: 1, sleeve; 10, upper base; 11, lower base; 12, first locking groove; 13, protrusion; 2, movable assembly; 20, diamond composite layer; 21, base; 22, rotating shaft; 23, second locking groove; 3, locking assembly; 30, elastic retainer ring; 31, cross-section retainer ring; 4, damping assembly; 40, disc spring; 41, elastic washer. DETAILED DESCRIPTION

[0028] To make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the range of protection of the present application.

[0029] The embodiments of the present application provide a diamond compact, which can solve the problems that the sleeve material in the diamond compact has extremely high hardness, the internal structure of the sleeve is difficult to process, and industrial implementation is poor in the related art.

[0030] Referring to Figures 1 to 9 The embodiments of the present application provide a diamond compact, which comprises a sleeve 1, a movable assembly 2, and a locking assembly 3. The sleeve 1 comprises an upper base 10 and a lower base 11. The upper base 10 is open at both ends, and the lower base 11 is open at one end and sealed at the other end. The upper base 10 is fixed to the open end of the lower base 11. The movable assembly 2 is inserted into the open end of the lower base 11 from the open end of the upper base 10. The locking assembly 3 is sleeved on the outer peripheral surface of the movable assembly 2. The movable assembly 2 is connected to the inside of the sleeve 1 through the locking assembly 3.

[0031] Since the deeper the hole is, the more difficult the processing is, and the more difficult the processing precision is to ensure, in the present application, the sleeve 1 is provided as a combined sleeve. The upper base 10 and the lower base 11 can be respectively drilled when the sleeve 1 is drilled. The drilling depth is reduced, the processing difficulty is reduced, and the processing precision of the sleeve 1 is improved. The lower base 11 is open at one end and sealed at the other end. The drilling depth is further reduced. Since the other end of the lower base 11 is sealed, when the other end of the lower base 11 is welded and fixed to the drill bit, the brazing material cannot flow into the inside of the lower base 11 to cause the movable assembly 2 to be welded and fixed, thereby reducing the process difficulty of installing the diamond compact to the drill bit.

[0032] The upper base 10 and the lower base 11 are both made of hard alloy. After the upper base 10 and the lower base 11 are respectively drilled, the upper base 10 and the lower base 11 are combined to form a combined sleeve. The drilling depth of the sleeve 1 is reduced at a time, and the drilling precision is improved.

[0033] The sleeve 1 is first welded to the drill bit, and then the movable assembly 2 and the locking assembly 3 are installed on the sleeve 1. Before the sleeve 1 is welded to the drill bit, the upper base 10 and the lower base 11 are first welded and fixed. The upper base 10 and the lower base 11 can be welded before the diamond compact is installed on the drill bit, or can be welded at the same time when the diamond compact is installed on the drill bit. The upper base 10 is provided with a chamfer at the open end.

[0034] To prevent solder from flowing into the hole during welding of the upper base 10 and the lower base 11, thus preventing the movable component 2 from being welded and fixed, in some embodiments, an annular protrusion 13 is provided at the open end of the lower base 11, and a groove matching the annular protrusion 13 is provided at one end of the upper base 10; in other embodiments, an annular protrusion 13 is provided at the open end of the upper base 10, and a groove matching the annular protrusion 13 is provided at one end of the lower base 11. The annular protrusion 13 can be an annular protrusion 13 with the center of the opening of the lower base 11 or the upper base 10 as its origin; the center of the annular protrusion 13 can also be different from the center of the opening of the lower base 11 or the upper base 10, that is, multiple annular protrusions 13 are provided on the welding surface of the lower base 11, and the multiple annular protrusions 13 are connected in pairs to form a barrier to prevent solder from flowing into the hole.

[0035] Based on the above embodiments, in this embodiment, the active component 2 includes: a diamond composite layer 20, a base 21 and a rotating shaft 22. The base 21 is fixed to one end of the diamond composite layer 20; the rotating shaft 22 is fixed to one end of the base 21, and one end of the rotating shaft 22 extends from the opening of the upper base 10 into the opening of the lower base 11.

[0036] In this embodiment, the base 21 is made of hard alloy, such as Figure 2 As shown, the base 21 is fixed to the bottom end of the diamond composite layer 20, and the rotating shaft 22 is fixed to the bottom end of the base 21. In some embodiments, the top end of the diamond composite layer 20 has a planar structure; in other embodiments, such as Figure 9 As shown, the other end (top) of the diamond composite layer 20 protrudes towards the end away from the base 21, forming a conical structure. Furthermore, the top of the diamond composite layer 20 can also have any other arbitrary structure; this embodiment is merely an example and is not limited thereto.

[0037] The locking component 3 is sleeved on the outer peripheral surface of the rotating shaft 22. To ensure the stability of the connection between the rotating shaft 22 and the locking component 3, a second locking groove 23 is provided on the outer peripheral surface of the rotating shaft 22 to accommodate the locking component 3. When the locking component 3 is sleeved on the outer peripheral surface of the rotating shaft 22, it is located within the second locking groove 23. The second locking groove 23 can limit the locking component 3, preventing it from moving up and down relative to the rotating shaft 22. This embodiment does not limit the number of locking components 3. For example, there can be one, two, three, etc., which can be set according to actual needs. This embodiment is not limited to this, but the number of second locking grooves 23 must correspond to the number of locking components 3.

[0038] On the basis of the above-mentioned embodiments, in order to avoid the random up and down movement of the locking assembly 3 and the rotating shaft 22 relative to the sleeve 1, in some embodiments, a first locking groove 12 for accommodating the locking assembly 3 is arranged on the inner wall of the upper base 10. The position of the first locking groove 12 can be set according to actual requirements. For example, the first locking groove 12 can be arranged at a position close to the opening on the inner wall of the upper base 10. The position of the second locking groove 23 corresponds to the position of the first locking groove 12.

[0039] In other embodiments, a first locking groove 12 for accommodating the locking assembly 3 is arranged on the inner wall of the lower base 11. The position of the first locking groove 12 can be set according to actual requirements. For example, the first locking groove 12 can be arranged at a position close to the opening on the inner wall of the lower base 11. The position of the second locking groove 23 corresponds to the position of the first locking groove 12.

[0040] In still some embodiments, a first locking groove 12 for accommodating the locking assembly 3 is arranged on the inner wall of the upper base 10 and the inner wall of the lower base 11. The position of the first locking groove 12 can be set according to actual requirements. For example, the first locking groove 12 can be arranged at a position close to the opening on the inner wall of the lower base 11 and a position close to the opening on the inner wall of the upper base 10. At this time, the number of the second locking grooves 23 is multiple, and the position of the second locking groove 23 corresponds to the position of the first locking groove 12.

[0041] As shown in Figure 1 , Figure 2 , one second locking groove 23 and one first locking groove 12 are arranged. The locking assembly 3 is an elastic retaining ring 30, which connects the bottom surface of the upper base 10 and the second locking groove 23 on the rotating shaft 22. As shown in Figure 3 , Figure 4 , the locking assembly 3 is a cross-section retaining ring 31, which connects the bottom surface of the upper base 10 and the second locking groove 23 on the rotating shaft 22. As shown in Figure 8 , the locking assembly 3 has two, which are a cross-section retaining ring 31 arranged at an upper position of the upper base 10 and an elastic retaining ring 30 arranged at the lower base 11.

[0042] On the basis of the above-mentioned embodiments, in this embodiment, the depth of the first locking groove 12 is greater than the thickness of the locking assembly 3. Taking the axis of the opening of the sleeve 1 as the reference, therefore, the movement mode of the movable assembly 2 can be rotating around the axis, moving along the axis, or a mixed motion of rotating around the axis and moving along the axis.

[0043] In order to enable the diamond compact to be buffered when subjected to impact vibration, the diamond compact further comprises a shock absorption assembly 4 arranged between the sleeve 1 and the movable assembly 2. The performance of the diamond compact can be greatly improved.

[0044] In some embodiments, such as Figure 6 As shown, the shock-absorbing component 4 includes a disc spring 40, which is disposed inside the lower base 11. One end of the disc spring 40 contacts the bottom of the inner wall of the lower base 11, and the other end contacts the movable component 2. Here, "contact" means that the disc spring 40 is in contact with both the lower base 11 and the movable component 2, but they are not fixed together. Before the movable component 2 is installed inside the sleeve 1, the disc spring 40 is placed inside the lower base 11. After the movable component 2 is installed inside the sleeve 1, the disc spring 40 is located between the bottom end of the rotating shaft 22 and the bottom of the inner wall of the lower base 11, and the disc spring 40 is in contact with both the bottom end of the rotating shaft 22 and the bottom of the inner wall of the lower base 11. Figure 6 In the diagram, L1 is the compression of disc spring 40, and L2 is the axial movement of rotating shaft 22. L2 is greater than or equal to L1.

[0045] In some embodiments, the shock-absorbing component 4 further includes an elastic washer 41, which is sleeved on the outer peripheral surface of the movable component 2, with one end of the elastic washer 41 positioned at the end of the upper base 10 away from the lower base 11. That is, the elastic washer 41 is used in conjunction with the disc spring 40, which is disposed inside the lower base 11, and the elastic washer 41 is positioned at the end of the upper base 10 away from the lower base 11.

[0046] In some embodiments, such as Figure 7 As shown, there are two elastic washers 41. One elastic washer 41 is located inside the lower base 11, and the other elastic washer 41 is sleeved on the outer peripheral surface of the movable component 2. The elastic washer 41 is located at the end of the upper base 10 away from the lower base 11.

[0047] The above embodiments are merely various possible implementations of the embodiments of this application, and the embodiments of this application are not limited thereto.

[0048] 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.

[0049] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0050] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polycrystalline diamond compact comprising, It includes: The sleeve (1) includes an upper base (10) and a lower base (11), the upper base (10) is open at both ends, the lower base (11) is open at one end and sealed at the other end, and the upper base (10) is fixed to the open end of the lower base (11); The movable assembly (2) is inserted into the opening of the lower base (11) from the opening of the upper base (10); The locking assembly (3) is sleeved on the outer surface of the movable assembly (2), and the movable assembly (2) is connected with the inside of the sleeve (1) through the locking assembly (3); The movable assembly (2) includes: The diamond composite layer (20); The base (21) is fixed to one end of the diamond composite layer (20); The rotating shaft (22) is fixed to one end of the base (21), and the rotating shaft (22) is inserted into the opening of the lower base (11) from the opening of the upper base (10); The first locking groove (12) is provided in the inner wall of the upper base (10) and / or the inner wall of the lower base (11) for accommodating the locking assembly (3); The depth of the first locking groove (12) is greater than the thickness of the locking assembly (3); The diamond composite sheet also includes a damping assembly (4) arranged between the sleeve (1) and the movable assembly (2); The damping assembly (4) includes a disc spring (40) arranged inside the lower base (11), one end of the disc spring (40) being in contact with the bottom of the inner wall of the lower base (11), and the other end being in contact with the movable assembly (2); L2 is greater than or equal to L1, L1 is the compression amount of the disc spring (40), and L2 is the amount of movement of the rotating shaft (22).

2. The diamond composite sheet of claim 1, wherein: The upper base (10) and the lower base (11) are welded and fixed; The open end of the lower base (11) is provided with an annular protrusion (13), and one end of the upper base (10) is provided with a groove matched with the annular protrusion (13).

3. The diamond composite sheet of claim 1, wherein: The rotating shaft (22) is provided with a second locking groove (23) on the outer surface for accommodating the locking assembly (3).

4. The diamond compact of claim 1, wherein: The other end of the diamond composite layer (20) protrudes away from one end of the base (21) to form a tapered structure.

5. The diamond composite sheet of claim 1, wherein: The damping assembly (4) includes an elastic washer (41) sleeved on the outer surface of the movable assembly (2), and one end of the elastic washer (41) is arranged at the end of the upper base (10) away from the lower base (11).

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