Conical shaft sleeve rotary cutting element and drill bit
By using a mounting base structure with a conical sleeve rotary cutting element and a combination of cylindrical section and closed section in the PDC drill bit, the problem of limited tooth space in the PDC drill bit in the prior art is solved, and higher cutting efficiency is achieved and lower installation difficulty.
Patent Information
- Application Number
- CN202420672125.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-02
AI Technical Summary
In the prior art, the fabric space of the PDC drill bit is limited due to the arrangement of a closed sleeve structure, making it difficult to improve the cutting efficiency of the drill bit.
Using a conical sleeve rotary cutting element, the mounting base structure of the cylindrical section and the closed section reduces the opening depth, improves the machining accuracy, and reduces tail interference through the round table design of the closed section and increases the fabric. Tooth density.
It effectively solves the problem of limited space in the PDC drill bit cloth, improves the cutting efficiency of the drill bit, and reduces the difficulty of the installation process.
Smart Images
Figure CN222478642U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of drill bits, in particular to a tapered sleeve rotary cutting element and a drill bit. Background Art
[0002] Since the 1980s, diamond drill bits have been widely used in oil and gas drilling projects. Diamond drill bits are divided into three categories based on 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 in oil and gas drilling projects are gradually increasing, and the formations encountered are becoming more and more complex.
[0003] When drilling in a highly abrasive formation, the existing drill bit diamond composite piece is fixed on the drill bit in an integrated manner, and the cutting edge of the diamond composite piece is always in contact with the formation. The friction between the cutting edge and the rock generates a large amount of heat, forming heat accumulation, and the heat accumulation will cause the performance of the composite piece to deteriorate. In response to this problem, the prior art provides a diamond composite piece that can rotate around the central axis of the diamond composite piece. The diamond composite piece is provided with a sleeve with an open 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, which better solves the problem of the composite piece's single cutting surface eating into the formation for a long time. However, the tail of the composite piece is an open structure, and brazing material may flow in during welding, causing the rotating shaft to be welded and fixed. At the same time, since the sleeve is a superhard material, the internal structure of the sleeve is difficult to process, and the industrial feasibility is poor. The prior art also provides a cemented carbide base of a combined base, which solves the problem of hard base processing. However, since the cylindrical sleeve with closed carbide tail occupies a large space while maintaining a certain bearing length, the tooth density of the PDC drill bit is limited. Utility Model Content
[0004] In view of the defects existing in the prior art, the purpose of the utility model is to provide a tapered sleeve rotary cutting element and a drill bit to solve the problem of limited PDC tooth arrangement space due to the provision of a closed sleeve structure in the prior art.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] In one aspect, the present application provides a tapered sleeve rotary cutting element, comprising:
[0007] Rotating parts;
[0008] The mounting base comprises a cylindrical section and a closed section, wherein the outer wall of the closed section is truncated cone-shaped and the large diameter end is connected to the cylindrical section, and the closed section is provided with a mounting groove, and forms a receiving groove for mounting one end of the rotating member together with the receiving space of the cylindrical section;
[0009] The locking assembly is sleeved on the outer peripheral surface of the rotating member, and the rotating member is connected to the side wall of the containing groove through the locking assembly.
[0010] In some optional embodiments, the rotating member includes a diamond composite layer, a connecting portion and a shaft connected in sequence, the shaft extends from the cylindrical section into the mounting groove, the connecting portion has a diameter greater than a diameter of the shaft and abuts against an end of the cylindrical section.
[0011] In some optional embodiments, the outer diameters of the connecting portion, the diamond composite layer, and the cylindrical section are the same.
[0012] In some optional embodiments, the outer wall of the shaft is circumferentially provided with a first locking groove for accommodating the locking assembly, and the side wall of the accommodating groove is circumferentially provided with a second locking groove for accommodating the locking assembly, and the first locking groove is opposite to the second locking groove opening.
[0013] In some optional embodiments, the locking assembly is an elastic retaining ring, which is partially located in the first locking groove and partially located in the second locking groove when in an extended state.
[0014] In some optional embodiments, the diamond composite layer protrudes from the other end away from the connecting portion toward one end away from the connecting portion to form a conical structure.
[0015] In some optional embodiments, a shock absorbing assembly is further included, wherein the shock absorbing assembly is disposed between the bottom wall of the accommodating groove and the rotating member, and is abutted against the bottom wall of the accommodating groove and the rotating member.
[0016] In some optional embodiments, the axial depth of the second locking groove is greater than the axial thickness of the locking assembly.
[0017] In some optional embodiments, the axial length ratio of the closed section to the cylindrical section is 1:3 to 1:1.
[0018] On the other hand, the present application also provides a drill bit, comprising any of the above-mentioned tapered sleeve rotating cutting elements.
[0019] Compared with the prior art, the advantages of the utility model are:
[0020] By setting the mounting base as a structure composed of a cylindrical section and a closed section, when opening the mounting groove, holes can be drilled in the cylindrical section and the closed section respectively, thereby reducing the depth of each hole drilling, reducing the difficulty of processing, and improving the processing accuracy; the closed section of the mounting base is set to be a truncated cone, and the large diameter end is connected to the cylindrical section, thereby reducing the problem of low tooth density caused by interference from the tail of the cutting element; by setting the closed section, when the small diameter end of the closed section is welded and fixed to the drill bit, the brazing material will not flow into the inside of the mounting groove to cause the rotating part to be welded and fixed, thereby reducing the process difficulty of installing the cutting element on the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0022] Figure 1 It is a schematic cross-sectional structure diagram of the first tapered sleeve rotary cutting element of the utility model;
[0023] Figure 2 It is a schematic diagram of the arrangement of two tapered sleeve rotary cutting elements of the utility model;
[0024] Figure 3 It is a schematic cross-sectional structure diagram of a second tapered sleeve rotary cutting element of the utility model;
[0025] Figure 4 It is a schematic cross-sectional structure diagram of a third tapered sleeve rotary cutting element of the utility model;
[0026] Figure 5 It is a schematic cross-sectional structure diagram of a fourth tapered sleeve rotary cutting element of the utility model.
[0027] In the figure: 1, rotating member; 11, diamond composite layer; 12, connecting part; 13, shaft; 131, first locking groove; 2, mounting base; 20, accommodating groove; 21, cylindrical section; 210, annular groove; 211, second locking groove; 22, closed section; 220, annular protrusion; 221, mounting groove; 222, closed cylindrical part; 223, cover plate; 3, locking assembly; 4, shock absorbing assembly. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0029] The following is a further detailed description of an embodiment of a tapered sleeve rotary cutting element and a drill bit of the utility model in conjunction with the accompanying drawings.
[0030] On the one hand, if Figures 1 to 3 As shown, the present application provides a tapered sleeve rotary cutting element, including a rotating member 1, a mounting base 2 and a locking assembly 3. The mounting base is connected to the rotating member 1 through the locking assembly 3. By reducing the tail structure of the mounting base, the problem of limited PDC tooth arrangement space is solved.
[0031] Specifically, Figure 2 As shown, the mounting base 2 includes a cylindrical section 21 and a closed section 22. The outer wall of the closed section 22 is truncated cone-shaped and the large diameter end is connected to the cylindrical section 21. The closed section 22 is provided with a mounting groove 221, and together with the accommodating space of the cylindrical section 21, forms an accommodating groove 20 for mounting one end of the rotating member 1; the locking assembly 3 is sleeved on the outer peripheral surface of the rotating member 1, and the rotating member 1 is connected to the side wall of the accommodating groove 20 through the locking assembly 3.
[0032] It can be understood that the deeper the hole is, the more difficult it is to process and the more difficult it is to ensure the processing accuracy. Therefore, in this application, the mounting base 2 is set as a structure composed of a cylindrical section 21 and a closed section 22. When the receiving groove 20 is opened, the cylindrical section 21 and the closed section 22 can be opened separately, which reduces the depth of each hole, reduces the difficulty of processing, and improves the processing accuracy. The cylindrical section 21 has openings at both ends, one side of the opening is used for the installation and insertion of the rotating member 1, and the other side of the opening is used to connect with the closed section 22, and after the connection, it is connected with the mounting groove 221 of the closed section 22. In this example, the mounting groove 221 and the receiving space of the cylindrical section 21 form a columnar receiving groove 20 adapted to the rotating member 1.
[0033] Or Figure 4 As shown, the closed section 22 is configured to include a closed cylindrical portion 222 and a cover plate 223. The closed cylindrical portion 222 is an annular structure with different diameters of openings at both ends. The large diameter end of the closed cylindrical portion 222 is connected to the cylindrical section 21 and communicates with the through hole. The cover plate 223 closes the small diameter end of the closed cylindrical portion 222 away from the cylindrical section 21. This configuration is also for the convenience of opening the through hole and installation. Preferably, the closed cylindrical portion 222 is integrally formed with the cylindrical section 21.
[0034] In this example, since the closed section 22 of the mounting base 2 is truncated cone-shaped and the large diameter end is connected to the cylindrical section 21, the problem of low tooth density caused by the tail interference of the cutting element is reduced. Figure 2 As shown, when the tooth surface spacing L1 of two cutting elements is constant and the axial length is constant, the tooth tail arrangement spacing L2 between two adjacent cutting elements can be arranged closer due to the truncated cone shape of the closed section 22, thereby increasing the tooth arrangement density. And when the small diameter end of the closed section 22 is welded and fixed to the drill bit, the brazing material will not flow into the inside of the receiving groove 20 to cause the rotating part 1 to be welded and fixed, thereby reducing the process difficulty of installing the cutting element on the drill bit.
[0035] It should be noted that, since the closed section 22 is provided with a mounting groove 221 , the rotating member 1 is partially located in the mounting groove 221 , and therefore, the closed section 22 should have a sufficient length in the axial direction. Preferably, the ratio of the closed section 22 to the cylindrical section 21 is 1:3 to 1:1.
[0036] Of course, the closed section 22 and the cylindrical section 21 may also be formed in one piece.
[0037] In some optional embodiments, the small-diameter end of the closed section 22 is further provided with an inwardly contracted chamfer.
[0038] In some optional embodiments, the cylindrical section 21 and the closed section 22 are both made of cemented carbide and are connected to form a whole after the holes are opened.
[0039] During installation, the mounting base 2 may be welded to the drill bit first, and then the rotating member 1 and the locking assembly 3 may be mounted on the mounting base 2 .
[0040] In some optional embodiments, the rotating member 1 includes a diamond composite layer 11, a connecting portion 12 and a shaft 13 connected in sequence, the shaft 13 extends from the cylindrical section to the mounting groove 221, the diameter of the connecting portion 12 is greater than the diameter of the shaft 13 and abuts against the end of the cylindrical section 21.
[0041] It can be understood that one end of the connecting portion 12 is connected to the diamond composite layer 11, and the other end is connected to the shaft 13. In this example, the connecting portion 12 and the shaft 13 are integrally formed, and the top of the diamond composite layer 11 away from the connecting portion 12 is a planar structure. In other embodiments, as shown in the figure, the top of the diamond composite layer 11 can also protrude away from the connecting portion 12 to form a conical structure, or it can be any other structure as needed, which is not limited here.
[0042] In some optional embodiments, the outer diameters of the connecting portion 12 , the diamond composite layer 11 , and the cylindrical section 21 are the same.
[0043] That is, when the rotating member 1 is installed in the mounting groove of the mounting base 2, the portion of the rotating member 1 outside the receiving groove 20 and the mounting base 2 form an overall structure with a smooth outer contour. It should be noted that the axis of the rotating member 1 coincides with the axis of the mounting base 2 to prevent the cutting element from being eccentric during rotation and causing uneven force and fracture.
[0044] In some optional embodiments, the outer wall of the shaft 13 is circumferentially provided with a first locking groove 131 for accommodating the locking assembly 3, and the side wall of the accommodating groove 20 is circumferentially provided with a second locking groove 211 for accommodating the locking assembly 3, and the openings of the first locking groove 131 and the second locking groove 211 are opposite to each other.
[0045] It can be understood that the first locking groove 131 and the second locking groove 211 form a limiting space for limiting the locking assembly 3 to prevent the locking assembly from moving axially relative to the rotating member 1. The number of the locking assembly 3 is not limited and can be set according to actual needs, but the first locking groove 131 and the second locking groove 211 should be the same as the number of the locking assembly 3 and the positions should correspond.
[0046] Optionally, the second locking groove 211 may be provided in the cylindrical section 21 or the closed section 22, or in both the cylindrical section 21 and the closed section 22. Figure 3 and Figure 5 As shown, the second locking groove 211 is formed on the closed section 22 and is located at the connection with the cylindrical section 21 .
[0047] In some optional embodiments, an annular groove 210 is provided on the connecting surface between the cylindrical section 21 and the closed section 22 , and an annular protrusion 220 matching the annular groove 210 is provided on the connecting surface between the closed section 22 and the cylindrical section 21 .
[0048] It can be understood that the cooperation between the annular groove 210 and the annular protrusion 220 can prevent the solder from flowing from the gap into the receiving groove 20 when welding the cylindrical section 21 and the drill bit after the cylindrical section 21 and the closed section 22 are connected. Of course, multiple groups of annular grooves and annular protrusions can also be provided to improve the sealing of the connection.
[0049] In some optional embodiments, the locking assembly 3 is an elastic retaining ring, a stretched portion of which is located in the first locking groove 131 and a portion of which is located in the second locking groove 211 .
[0050] It can be understood that the elastic circlip connects the mounting base 2 and the rotating member 1. In other embodiments, in order to make the connection between the mounting base 2 and the rotating member 1 more stable, a cross-section circlip can be provided at the connection between the closed section 22 and the cylindrical section 21, the cross-section circlip connects the bottom surface of the cylindrical section 21 and the first locking groove 131 on the shaft 13, and an elastic circlip is provided on the closed section 22, the elastic circlip connects the closed section 22 and the first locking groove 131 on the shaft 13.
[0051] In some optional embodiments, the cutting element further includes a shock absorbing assembly 4 , which is disposed between the bottom wall of the accommodating groove 20 and the rotating member 1 , and abuts against the bottom wall of the accommodating groove 20 and the rotating member 1 .
[0052] In order to buffer the impact vibration of the cutting element, the cutting element is further provided with a shock absorbing component 4, which can greatly improve the performance of the diamond composite sheet.
[0053] In some optional embodiments, the shock absorbing component is a disc spring. During installation, before the installation base 2 is connected to the rotating member 1, the disc spring is placed at the bottom of the installation groove 221, and then the rotating member 1 is installed, so that after the rotating member 1 is installed in the receiving groove 20, the disc spring can abut against the bottom wall of the receiving groove 20 and the rotating member 1.
[0054] like Figure 5 As shown, in order to provide a certain buffer space for the rotating member 1 in the receiving groove 20, the axial depth of the second locking groove 211 is appropriately deepened, and the axial depth of the second locking groove 211 is greater than the axial thickness of the locking assembly 3, and the first locking groove 131 is adapted to the locking assembly 3. Among them, S1 is the compression amount of the disc spring, S2 is the movement amount of the rotating member 1, and S2 is greater than or equal to S1.
[0055] The purpose of such arrangement is to avoid impact and damage to the structure of the mounting base 2 when the rotating member 1 and the mounting base 2 are relatively displaced in the axial direction.
[0056] Preferably, an elastic gasket is provided on the side wall where the disc spring contacts the rotating member 1 and the accommodating groove 20 to protect the rotating member 1 and the mounting base 2.
[0057] In some optional embodiments, the angle between the side wall of the closed section 22 and the axis is 6-15 degrees.
[0058] On the other hand, the present application also provides a drill bit, comprising any of the above-mentioned tapered sleeve rotating cutting elements.
[0059] Since the closed section 22 of the mounting base 2 of the tapered sleeve rotary cutting element is truncated, and the large diameter end is connected to the cylindrical section 21, the problem of low tooth density caused by the interference of the tail of the cutting element is reduced. Figure 2 As shown, when the tooth surface spacing L1 and the axial length of two cutting elements are constant, the tooth tail arrangement spacing L2 between two adjacent cutting elements can be arranged closer due to the truncated cone shape of the closed section 22, thereby increasing the tooth arrangement density of the drill bit.
[0060] The present application relates to a tapered sleeve rotary cutting element and a drill bit. By setting the mounting base 2 as a structure composed of a cylindrical section 21 and a closed section 22, when the receiving groove 20 is opened, the cylindrical section 21 and the closed section 22 can be opened separately, thereby reducing the depth of each hole opening, reducing the difficulty of processing, and improving the processing accuracy; the closed section 22 of the mounting base 2 is set to a truncated cone shape, and the large-diameter end is connected to the cylindrical section 21, thereby reducing the problem of low tooth density caused by interference at the tail of the cutting element; by setting the closed section 22, when the small-diameter end of the closed section 22 is welded and fixed to the drill bit, the brazing material will not flow into the interior of the receiving groove 20 to cause the rotating part 1 to be welded and fixed, thereby reducing the process difficulty of installing the cutting element on the drill bit; by the first A locking groove 131 and a second locking groove 211 form a limiting space for limiting the locking assembly 3, thereby preventing the locking assembly from moving axially relative to the rotating member 1; by cooperating between the annular groove and the annular protrusion, the sealing of the connection is improved after the cylindrical section 21 and the closed section 22 are connected, thereby preventing the solder from flowing from the gap into the accommodating groove 20 when welding the cylindrical section 21 and the drill bit; by providing the shock absorbing assembly 4 and appropriately deepening the axial depth of the second locking groove 211, the axial groove depth of the second locking groove 211 is greater than the axial thickness of the locking assembly 3, and the first locking groove 131 is adapted to the locking assembly 3, thereby preventing the structure of the mounting base 2 from being impacted and damaged when the rotating member 1 and the mounting base 2 undergo axial relative displacement.
[0061] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0062] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0063] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. A tapered sleeve rotary cutting element, characterized in that: include: Rotating member (1); A mounting base (2), comprising a cylindrical section (21) and a closed section (22), wherein the outer wall of the closed section (22) is truncated cone-shaped and the large diameter end is connected to the cylindrical section (21), and the closed section (22) is provided with a mounting groove (221) and forms a receiving groove (20) for mounting one end of the rotating member (1) together with the receiving space of the cylindrical section (21); A locking assembly (3) is sleeved on the outer peripheral surface of the rotating member (1); the rotating member (1) is connected to the side wall of the accommodating groove (20) through the locking assembly (3).
2. The tapered sleeve rotary cutting element according to claim 1, characterized in that: The rotating member (1) comprises a diamond composite layer (11), a connecting portion (12) and a shaft (13) which are connected in sequence, the shaft (13) extending from the cylindrical section into the mounting groove (221), the connecting portion (12) having a diameter greater than that of the shaft (13) and abutting against the end of the cylindrical section (21).
3. The tapered sleeve rotary cutting element according to claim 2, characterized in that: The connecting portion (12), the diamond composite layer (11), and the cylindrical section (21) have the same outer diameters.
4. The tapered sleeve rotary cutting element according to claim 2, wherein: The outer wall of the shaft (13) is circumferentially provided with a first locking groove (131) for accommodating the locking assembly (3), and the side wall of the accommodating groove (20) is circumferentially provided with a second locking groove (211) for accommodating the locking assembly (3), and the openings of the first locking groove (131) and the second locking groove (211) are opposite to each other.
5. The tapered sleeve rotary cutting element according to claim 4, characterized in that: The locking assembly (3) is an elastic retaining ring, which is partially located in the first locking groove (131) and partially located in the second locking groove (211) when in an extended state.
6. The tapered sleeve rotary cutting element according to claim 2, wherein: The other end of the diamond composite layer (11) away from the connecting portion (12) protrudes toward one end away from the connecting portion (12), forming a conical structure.
7. The tapered sleeve rotary cutting element according to claim 4, characterized in that: It also includes a shock absorbing component (4), which is arranged between the bottom wall of the accommodating groove (20) and the rotating member (1), and abuts against the bottom wall of the accommodating groove (20) and the rotating member (1).
8. The tapered sleeve rotary cutting element according to claim 7, characterized in that: The axial groove depth of the second locking groove (211) is greater than the axial thickness of the locking assembly (3).
9. The tapered sleeve rotary cutting element according to claim 1, wherein: The axial length ratio of the closed section (22) to the cylindrical section (21) is 1:3 to 1:
1.
10. A drill bit, characterized in that: A tapered sleeve rotating cutting element comprising the tapered sleeve rotating cutting element as claimed in any one of claims 1 to 9.