A conical insert and drill bit

Abstract

The application relates to a conical complex piece and a drill bit, which comprises a base and a conical tooth arranged on the top surface of the base, the bottom end of the conical tooth is connected with the top surface of the base, the top end of the conical tooth is provided with an impact surface for contacting with the external environment, first recessed surfaces and second recessed surfaces are arranged on the circumferential outer wall of the conical tooth and are spaced apart in the circumferential direction, and the side edges of the first recessed surfaces and the second recessed surfaces which are close to each other both extend along the generatrix direction of the conical tooth, and a ridge is formed between the first recessed surfaces and the second recessed surfaces. The ridge can effectively scrape the stratum structure during rotation, improves the attackability and the ability of eating into the stratum, and finally improves the efficiency of the conical complex piece during drilling. In addition, the impact surface arranged at the top end of the conical complex piece has strong impact resistance when contacting with the stratum, and finally the drill bit has strong impact resistance and strong scraping effect.

Description

Technical Field

[0001] This application relates to the field of drilling equipment, and in particular to a conical composite disc and a drill bit. Background Technology

[0002] In recent years, the exploration and development of oil and gas resources has seen a surge in the formation of alternating soft and hard strata, along with the expansion of exploration blocks. Gravel layers and hard interlayers are also frequently encountered. When faced with these formations, drill bits often exhibit insufficient impact resistance. This is primarily because conventional circular composite blades are prone to chipping when transitioning from soft to hard formations, leading to a decrease in mechanical drilling rate and footage, and impacting the drilling cycle. Solving these formation problems generally relies on continuously improving the impact resistance of the composite blades to enhance the overall performance of the drill bit. However, improving the impact resistance of circular composite blades is challenging, and after years of optimization, circular composite blades have reached a bottleneck in improving impact resistance. Therefore, the only solution is to optimize the blade tooth profile to improve the drill bit's impact resistance and attack capability, thereby shortening the drilling cycle.

[0003] In related technologies, conical composite plates are often used instead of circular composite plates. Conical teeth have arc-shaped tops and are installed at a specific angle in the second row of the drill bit, which has a certain auxiliary impact resistance. However, while the impact of conical teeth is strong, it also limits the depth to which they penetrate into the formation structure and cannot play an effective scraping role. Therefore, the drill bit often exhibits high tooth density and slow drilling speed, which needs further improvement. Summary of the Invention

[0004] This application provides a tapered composite blade and a drill bit to solve the problem of poor scraping performance of tapered composite blades in related technologies.

[0005] Firstly, a conical composite sheet is provided, employing the following scheme:

[0006] A conical composite sheet includes a base and conical teeth disposed on the top surface of the base, the bottom end of the conical teeth being connected to the top surface of the base, and the top end of the conical teeth being provided with an impact surface for contact with the external environment.

[0007] The tapered tooth has a first recessed surface and a second recessed surface spaced apart circumferentially on its outer circumferential wall. The edges of the first recessed surface and the second recessed surface that are close to each other extend along the generatrix of the tapered tooth and form a ridge between the first recessed surface and the second recessed surface.

[0008] In some embodiments, the edges of the first recessed surface and the second recessed surface that are far apart from each other both extend along the generatrix direction of the conical tooth, and the two side edges of the first recessed surface and the second recessed surface are respectively connected to the impact surface.

[0009] In some embodiments, the side edges of the first recessed surface and the second recessed surface extend to the bottom periphery of the tapered tooth.

[0010] In some embodiments, the axial direction of the conical teeth is eccentrically arranged parallel to and spaced from the axial direction of the base, and the bottom periphery of the conical teeth coincides with and abuts the top periphery of the base.

[0011] In some embodiments, the ridge is located on the side of the tapered tooth axially away from the base axially.

[0012] In some embodiments, the first recessed surface and the second recessed surface are symmetrically arranged on both sides of the ridge.

[0013] In some embodiments, the top surface of the base is a convex arc surface, and the bottom end face of the conical tooth is a concave arc surface corresponding to the top surface of the base.

[0014] Secondly, this application provides a drill bit with the following solution:

[0015] A drill bit comprising:

[0016] Drill bit body;

[0017] Multiple rows of teeth are connected to the drill bit body, and each row of teeth includes multiple conical composite plates as described above.

[0018] In some embodiments, the ridges of each of the conical composite plates are oriented toward the feed direction of the drill bit body.

[0019] In some embodiments, the tooth assembly further includes a second composite plate connected to the drill bit body, wherein the conical composite plate and the second composite plate are arranged alternately on the drill bit body, and...

[0020] There is a height difference between the conical composite plate and the second composite plate within the same tooth group, and there is a height difference between the conical composite plates in two adjacent rows of tooth groups.

[0021] The beneficial effects of the technical solution provided in this application include:

[0022] This application provides a conical composite blade and a drill bit. Because the conical teeth used for drilling have a first concave surface and a second concave surface, a ridge extending along the generatrix of the conical teeth is formed between them. When the conical teeth are drilling, the ridge can effectively scrape the formation structure during rotation, improving its aggressiveness and ability to penetrate the formation, thereby ultimately improving the efficiency of the conical composite blade during drilling. At the same time, due to the impact surface provided at the top of the conical composite blade, it has strong impact resistance when contacting the formation, ultimately achieving a drill bit with strong impact resistance and strong scraping effect. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the overall structure of the cone-shaped composite sheet;

[0025] Figure 2 This is a top view of the conical composite sheet;

[0026] Figure 3 This is a schematic diagram of a conical composite sheet structure according to another embodiment;

[0027] Figure 4 This is a schematic diagram of the overall structure of the drill bit;

[0028] Figure 5 This is a schematic diagram of the drilling process for a conical composite section.

[0029] In the picture:

[0030] 1. Base; 10. Top surface;

[0031] 2. Conical teeth; 20. Impact surface; 21. First concave surface; 22. Second concave surface; 23. Raised ridge;

[0032] 3. Drill bit body; 30. Tooth assembly; 300. Conical composite disc; 301. Second composite disc. Detailed Implementation

[0033] 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.

[0034] This application provides a tapered composite blade and a drill bit, which can solve the problem of poor scraping effect of tapered composite blades in related technologies.

[0035] Reference Figure 1-2 A conical composite sheet includes a base 1 and a conical tooth 2 disposed on the top surface 10 of the base 1. The bottom end of the conical tooth 2 is connected to the top surface 10 of the base 1, and the top end of the conical tooth 2 is provided with an impact surface 20 for contact with the external environment.

[0036] The tapered tooth 2 has a first recessed surface 21 and a second recessed surface 22 spaced apart circumferentially on its outer wall. The edges of the first recessed surface 21 and the second recessed surface 22 that are close to each other extend along the generatrix of the tapered tooth 2, and a ridge 23 is formed between the first recessed surface 21 and the second recessed surface 22.

[0037] Wherein, the first concave surface 21 and the second concave surface 22 are the concave areas formed on the concave teeth 2 after a portion of the conical teeth 2 is removed from their respective cutting surfaces. The surfaces formed by removing a portion of the conical teeth 2 to form the first concave surface 21 and the second concave surface 22 can be planes, curved surfaces, or a combination of both. Specifically, the curved surface can be one or more of the following: concave arc surface, convex arc surface, and wavy surface.

[0038] In this embodiment, the cutting conical teeth 2 form a plane for the first concave surface 21 and the second concave surface 22. That is, the inner surfaces of the first concave surface 21 and the second concave surface 22 have a planar structure, and the included angle between the inner surfaces of the first concave surface 21 and the second concave surface 22 is 110 degrees, and a ridge 23 is formed between them.

[0039] Specifically, in different embodiments, the height of the conical tooth 2 is 8-25mm, the diameter is 8-20mm, the included angle of the cone formed is 30-130 degrees, and the distance between the axial direction of the conical tooth 2 and the axial direction of the base 1 is 0-6mm. In this embodiment, the height of the conical tooth 2 is specifically 15mm, the diameter is 14mm, and the axial direction of the conical tooth 2 is coaxial with the axial direction of the base 1.

[0040] With this configuration, the conical teeth 2 used for drilling have a first concave surface 21 and a second concave surface 22, which together form a ridge 23 extending along the generatrix of the conical teeth 2. When the conical teeth 2 are drilling, the ridge 23 can effectively scrape the formation structure during rotation, improving its aggressiveness and ability to penetrate the formation. This ultimately improves the efficiency of the conical composite plate 300 during drilling. At the same time, the impact surface 20 at the top of the conical composite plate 300 gives it strong impact resistance when in contact with the formation, thus achieving both strong impact resistance and strong scraping effect in the drill bit.

[0041] Optionally, the edges of the first recessed surface 21 and the second recessed surface 22 that are far apart from each other extend along the generatrix direction of the conical tooth 2, and the two sides of the first recessed surface 21 and the second recessed surface 22 are respectively connected to the impact surface 20.

[0042] This configuration ensures that when the conical tooth 2 rotates to one side, at least one edge of the relatively far side of the first concave surface 21 and the second concave surface 22 has a scraping effect on the formation structure consistent with the ridge 23, thereby further improving the scraping effect of the conical composite sheet 300 provided in this embodiment. Furthermore, since the two sides of the first concave surface 21 and the second concave surface 22 intersect with the impact surface 20, the first concave surface 21 and the second concave surface 22 are prevented from intersecting with the impact surface 20, thus ensuring the integrity of the impact surface 20 and consequently guaranteeing the impact resistance of the conical tooth 2.

[0043] Optionally, both sides of the first recessed surface 21 and the second recessed surface 22 extend to the bottom periphery of the conical tooth 2.

[0044] This configuration effectively ensures the length of the ridge 23 formed by the first concave surface 21 and the second concave surface 22, thereby maximizing the scraping effect of the ridge 23.

[0045] Reference Figure 3 Optionally, the axial direction of the conical tooth 2 is eccentrically arranged parallel to and spaced from the axial direction of the base 1, and the bottom periphery of the conical tooth 2 coincides and abuts with the periphery of the top surface 10 of the base 1.

[0046] In this embodiment, the conical teeth 2 are spaced 1.5 mm apart from the axial direction of the base 1 by a distance L1.

[0047] This design increases the range of motion of the tip of the conical tooth 2 during rotation, thereby enhancing the overall aggressiveness of the conical composite plate 300 and improving drilling efficiency when using this conical composite plate 300.

[0048] Reference Figure 3Optionally, the ridge 23 is located on the side of the conical tooth 2 that is axially away from the base 1.

[0049] In this configuration, because the conical teeth 2 are eccentrically positioned on the top surface 10 of the base 1, and the bottom periphery of the conical teeth 2 aligns with the periphery of the base 1, the bottom surface of the conical teeth 2 is inclined relative to the impact surface 20 at the top. When the ridge 23 is located on the side of the conical teeth 2 that is axially away from the base 1, that is, when the ridge 23 is located on the side of the conical teeth 2 closer to the periphery of the base 1, and in this embodiment, the ridge 23 is located in the middle of the outer circumferential wall of this portion of the conical teeth 2, minimizing the distance between the ridge 23 and the periphery of the base 1, and also minimizing its length. Therefore, when the conical teeth 2 rotate, the ridge 23 on them can more effectively scrape the geological structure.

[0050] Meanwhile, since the slope of the conical tooth 2 away from the ridge 23 is longer, the contact area of ​​the conical tooth 2 when it rotates to contact the formation structure on this slope is increased, which can effectively alleviate the stress state of the conical tooth 2 when it contacts the formation and improve the stability of the conical tooth 2 during drilling.

[0051] Specifically, in this embodiment, the radius R of the impact surface 20 is 0.5 mm, the height H1 of the ridge 23 is 5 mm, the apex angle a of the conical tooth 2 is 90 degrees, the diameter D of the composite piece is 13.5 mm, and the height H is 20 mm.

[0052] In other embodiments, the ridge 23 may be located on the other side of the axial direction of the conical tooth 2, that is, the ridge may be located on the side with the longer slope of the conical tooth 2.

[0053] Optionally, the first recessed surface 21 and the second recessed surface 22 are symmetrically arranged on both sides of the ridge 23.

[0054] This configuration ensures that the first concave surface 21 and the second concave surface 22 are the same size, thereby enabling effective scraping of both sides of the formed ridge 23. This achieves a strong scraping effect on the formation structure when the conical composite sheet 300 rotates in different directions.

[0055] In addition, in other embodiments, the first concave surface 21 and the second concave surface 22 may be asymmetrically arranged on both sides of the ridge 23.

[0056] Optionally, the top surface 10 of the base 1 is provided with a convex arc surface, and the bottom end face of the conical tooth 2 is a concave arc surface corresponding to the top surface 10 of the base 1.

[0057] With this configuration, the connection between the base 1 and the conical tooth 2 via the convex arc surface, compared to the flat connection, provides stronger connection stability, thereby ensuring the service life and operational stability of the conical composite sheet 300.

[0058] Furthermore, in different embodiments, the connection surface between the base 1 and the conical tooth 2 can be a plane, a conical surface, a spherical surface, a wavy surface, a grooved surface, or a combination of multiple surfaces.

[0059] Reference Figure 4 On the other hand, this application provides a drill bit.

[0060] A drill bit comprising:

[0061] Drill bit body 3;

[0062] A multi-row tooth assembly 30 is connected to the drill bit body 3, and each row of the tooth assembly 30 includes multiple conical composite plates 300 as described above.

[0063] This design enables the drill bit to have strong impact resistance and scraping effect when using the aforementioned conical composite blade 300, thereby effectively improving drilling efficiency and shortening the drilling cycle during drilling operations.

[0064] Reference Figure 5 Optionally, the ridges 23 of each of the conical composite plates 300 are oriented toward the feed direction X of the drill bit body 3.

[0065] This configuration allows the two sides of the ridge 23 to be perpendicular to the rotation direction of the drill bit body 3, thereby enabling the conical composite plate 300 on the drill bit to effectively scrape the formation structure when the drill bit is rotating.

[0066] Furthermore, when the conical composite plate 300 is installed on the drill bit body 3, it is tilted forward, forming a certain angle with the formation structure. This allows the ridges 23 on the conical composite plate 300 to exert a pressing and plowing effect when in contact with the formation. Specifically, the tilt angle of the conical composite plate 300 installed on the drill bit body 3 can be set from 0 to 50 degrees as needed.

[0067] Reference Figure 4 Optionally, the tooth assembly 30 further includes a second composite plate 301 connected to the drill bit body 3. The conical composite plate 300 and the second composite plate 301 are arranged alternately on the drill bit body 3.

[0068] There is a height difference between the conical composite plate 300 and the second composite plate 301 within the same tooth group 30, and there is a height difference between the conical composite plates 300 within two adjacent rows of tooth groups 30.

[0069] In this embodiment, the second composite sheet 301 is specifically selected with pointed teeth, but in different embodiments, it can be selected with irregular teeth such as round teeth or triangular teeth.

[0070] Furthermore, in different embodiments, the height difference between the conical composite plate 300 and the second composite plate 301 within the same tooth group 30 can be controlled to be -3 to 3 mm; the height difference between the conical composite plates 300 within two adjacent tooth groups 30 can be controlled to be -3 to 3 mm.

[0071] Optionally, both the base 1 and the conical teeth 2 can be made of cemented carbide, diamond, cubic boron carbide, or any combination of the aforementioned materials.

[0072] 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.

[0073] 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.

[0074] 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 conical composite sheet, comprising a base (1) and conical teeth (2) disposed on the top surface (10) of the base (1), characterized in that, The bottom end of the conical tooth (2) is connected to the top surface (10) of the base (1), and the top end of the conical tooth (2) is provided with an impact surface (20) for contact with the external environment; The axial direction of the conical teeth (2) is eccentrically arranged parallel to and spaced from the axial direction of the base (1), and the bottom periphery of the conical teeth (2) coincides and abuts with the periphery of the top surface (10) of the base (1); The tapered tooth (2) has a first recessed surface (21) and a second recessed surface (22) spaced apart circumferentially on its outer circumferential wall. The edges of the first recessed surface (21) and the second recessed surface (22) that are close to each other extend along the generatrix of the tapered tooth (2) and form a ridge (23) between the first recessed surface (21) and the second recessed surface (22). Both sides of the first recessed surface (21) and the second recessed surface (22) extend to the bottom periphery of the conical tooth (2). The surfaces of the first recessed surface (21) and the second recessed surface (22) can be planes, curved surfaces, or a combination of both.

2. The conical composite sheet according to claim 1, characterized in that, The edges of the first recessed surface (21) and the second recessed surface (22) that are far apart from each other both extend along the generatrix of the conical tooth (2), and the two sides of the first recessed surface (21) and the second recessed surface (22) are respectively connected to the impact surface (20).

3. The conical composite sheet according to claim 1, characterized in that, The ridge (23) is located on the side of the conical tooth (2) away from the axial direction of the base (1).

4. The conical composite sheet according to claim 1, characterized in that, The first concave surface (21) and the second concave surface (22) are symmetrically arranged on both sides of the convex ridge (23).

5. The conical composite sheet according to claim 1, characterized in that, The top surface (10) of the base (1) is a convex arc surface, and the bottom end face of the conical tooth (2) is a concave arc surface corresponding to the top surface (10) of the base (1).

6. A drill bit, characterized in that, It includes: Drill bit body (3); A multi-row tooth assembly (30) is connected to the drill bit body (3), and each row of the tooth assembly (30) includes a plurality of conical composite plates (300) as described in claim 1.

7. The drill bit according to claim 6, characterized in that, The ridges (23) of each of the conical composite plates (300) are oriented toward the feed direction of the drill bit body (3).

8. The drill bit according to claim 6, characterized in that, The tooth assembly (30) also includes a second composite plate (301) connected to the drill bit body (3). The conical composite plate (300) and the second composite plate (301) are arranged alternately on the drill bit body (3), and... There is a height difference between the conical composite plate (300) and the second composite plate (301) in the same tooth group (30), and there is a height difference between the conical composite plates (300) in two adjacent rows of tooth groups (30).

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