Self-actuated rotary tooth and drill bit

Abstract

The present application belongs to the technical field of drilling tools, and particularly relates to a self-driven rotary tooth and a drill bit. The self-driven rotary tooth comprises a rotating sleeve and a core tooth coaxially arranged on the rotating sleeve. A driving combination surface is arranged on the working surface of the core tooth. The driving combination surface is configured to rotate the core tooth relative to the rotating sleeve when subjected to an axial force. The working surface of the core tooth is provided with the driving combination surface, so that the core tooth is configured as a special-shaped tooth. On the one hand, the core tooth can automatically rotate in the process of drilling without a side turning angle, can be installed at a cutting tooth position of a conventional PDC drill bit, and can be used interchangeably with a conventional PDC cutting tooth, thereby facilitating the large-area popularization and application of the rotary tooth, improving the impact resistance and aggressiveness of the core tooth. On the other hand, the impact resistance and aggressiveness of the core tooth are improved.

Description

Technical Field

[0001] This invention belongs to the field of drilling technology, specifically relating to a self-driven rotating tooth and a drill bit. Background Technology

[0002] In the existing technology, there is a PDC rotary tooth that is mounted on a PDC drill bit and can rotate automatically during drilling, maximizing the use of the sharp edges of the PDC rotary tooth's cutting teeth and helping the PDC cutting teeth to remain sharp for a longer period of time.

[0003] However, the current PDC rotary teeth have a flat tooth surface, which limits their impact resistance and needs further improvement. Furthermore, they require a side angle to rotate. Therefore, when existing PDC rotary teeth are installed on conventional drill bits, they cannot rotate automatically during drilling. Existing PDC rotary teeth can only rotate automatically during drilling when installed on rotary tooth drill bits with a specially designed structure.

[0004] Therefore, there is an urgent need to develop a self-driven rotating tooth that can be used in conventional drill bits. Summary of the Invention

[0005] To address the technical problems described above, the present invention aims to provide a self-driving rotating tooth that can be applied to conventional drill bits and rotates automatically during drilling.

[0006] The present invention also proposes a drill bit having self-driving rotating teeth according to the present invention.

[0007] According to the present invention, a self-driven rotating gear is provided, comprising:

[0008] Rotating sleeve;

[0009] A core tooth is coaxially rotatably mounted on the rotating sleeve. A drive assembly surface is provided on the working surface of the core tooth. The drive assembly surface is configured to allow the core tooth to rotate relative to the rotating sleeve when subjected to axial force.

[0010] In one specific embodiment, the drive assembly surface includes a plurality of drive surfaces evenly arranged circumferentially along the working surface of the tooth.

[0011] In one specific embodiment, the driving surface includes a first edge and a second edge arranged sequentially along the circumference of the tooth, the first edge and the second edge being the highest and lowest points of the driving inclined surface, respectively, and the connecting surface between the first edge and the second edge being an inclined surface or a curved surface.

[0012] In one specific embodiment, both the first edge and the second edge are configured to be inclined relative to the radial line of the heart tooth.

[0013] In one specific embodiment, the drive assembly surface is disposed at the circumferential edge of the working surface of the core tooth, and a tooth plane is disposed at the center of the working surface.

[0014] In one specific embodiment, a first chamfer is provided on the radially outer side of the drive assembly surface, and a second chamfer is provided on the radially inner side of the drive assembly surface.

[0015] In one specific embodiment, an annular groove is provided between the tooth plane and the drive assembly surface.

[0016] In one specific embodiment, the tooth is connected to the rotating sleeve via a snap ring.

[0017] In one specific embodiment, ball grooves are provided on the outer wall of the tooth and the inner wall of the rotating sleeve, bearing balls are provided in the ball grooves, and ball injection holes connected to the ball grooves are provided on the sleeve wall of the rotating sleeve.

[0018] According to the present invention, a drill bit is also provided, comprising a drill bit body and a cutter wing disposed on the drill bit body, wherein the cutter wing is provided with a self-driving rotating tooth according to the present invention.

[0019] Compared with the prior art, the advantages of this application are as follows.

[0020] The working face of the mandrel in this invention is equipped with a drive assembly surface, making the mandrel structure an irregular tooth. On the one hand, it can automatically rotate during drilling without the need for a side rotation angle, and can be installed in the cutting tooth position of a conventional PDC drill bit, interchangeable with conventional PDC cutting teeth, which is conducive to the widespread application of rotating teeth. On the other hand, it can improve the impact resistance and aggression resistance of the mandrel.

[0021] The drill bit provided by this invention incorporates self-driving rotating teeth into key parts of the drill bit. These teeth automatically rotate during drilling, increasing the working edge length and significantly extending the time they maintain a sharp state. This improves the high-speed drilling time and the average mechanical drilling speed of the drill bit, resulting in a substantial increase in drill bit lifespan. Attached Figure Description

[0022] The present invention will now be described with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of an embodiment of a self-driving rotating gear according to the present invention is shown;

[0024] Figure 2 A schematic diagram of another embodiment of the self-driving rotating gear proposed according to the present invention is shown;

[0025] Figure 3A schematic diagram of a self-driven rotating toothed retaining ring is shown according to the present invention;

[0026] Figure 4 A schematic diagram of a self-driving rotating toothed bearing ball according to the present invention is shown;

[0027] Figure 5 A schematic diagram of a drill bit provided with self-driving rotating teeth according to the present invention is shown.

[0028] The reference numerals in the figure are as follows:

[0029] 1. Core tooth; 12. Working face; 14. Radial line; 2. Rotating sleeve; 3. Snap ring; 4. First chamfer; 5. Tooth plane; 6. Drive assembly surface; 61. Drive surface; 611. First edge; 612. Second edge; 7. Second chamfer; 8. Annular groove; 9. Ball groove; 10. Bearing ball; 11. Ball injection hole; 101. Cutting layer; 102. Mandrel; 103. Small diameter section; 104. Large diameter section; 200. Drill bit; 201. Self-driven rotating tooth; 202. Conventional PDC tooth; 203. Drill bit body; 204. Cutting blade; 205. Flow channel; 206. Core hole; 207. Nozzle; 208. Upper groove; 209. Connector; 210. Key parts.

[0030] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0031] The invention will now be described with reference to the accompanying drawings.

[0032] It should be noted that the directional terms or qualifiers used in this application, such as "up," "down," "left," and "right," are all specific to the referenced material. Figure 1 In this application, directional terms or qualifiers such as "axial" and "radial" refer to the overall structure of the self-driven rotating gear 201. That is, "radial" refers to the diameter direction of the self-driven rotating gear 201, and "axial" refers to the direction of the central axis of the self-driven rotating gear 201. They are not used to define the absolute position of the components involved, but can vary depending on the specific circumstances.

[0033] Figure 1 The structure of the self-driven rotating gear 201 according to the present invention is shown. For example... Figure 1 As shown, the self-driven rotating gear 201 mainly includes a rotating sleeve 2 and a core tooth 1.

[0034] In this embodiment, the rotating sleeve 2 is constructed in the shape of a cylindrical tube. When the self-driven rotating tooth 201 is installed on the drill bit, the rotating sleeve 2 is used to fix and connect with the drill bit's cutting blade.

[0035] like Figure 1 and Figure 3 As shown, the tooth 1 includes a spindle 102 and a cutting layer 101.

[0036] The cross-sectional structure of the mandrel 102 is T-shaped. Specifically, as shown... Figure 3 As shown, the spindle 102 includes a large-diameter portion 104 and a small-diameter portion 103 coaxially fixed, with the outer diameter of the large-diameter portion 104 being larger than the outer diameter of the small-diameter portion 103. The small-diameter portion 103 is rotatably engaged with the inner wall of the rotating sleeve 2 to form a rotating pair, and the lower end face of the large-diameter portion 104 is in contact with the upper end face of the rotating sleeve 2 to form a friction pair.

[0037] In this embodiment, the outer diameter of the large diameter portion 104 is equal to the outer diameter of the rotating sleeve 2.

[0038] In a preferred embodiment, the cutting layer 101 is a diamond layer.

[0039] like Figure 1 As shown, the upper surface of the cutting layer 101 is the working surface 12. A drive assembly surface 6 is provided on the working surface 12. The drive assembly surface 6 is constructed to allow the mandrel 1 to rotate relative to the rotating sleeve 2 when subjected to axial force. It should be noted that the axial force in this article refers to the reaction force from the formation on the drive assembly surface 6 of the self-driven rotating tooth 201 installed on the drill bit during conventional drilling. The direction of this reaction force is approximately coincident with the central axis of the self-driven rotating tooth 201. The specific direction of this reaction force is related to the installation angle of the self-driven rotating tooth 201 on the drill bit and is not limited to being completely coincident with the central axis of the self-driven rotating tooth 201.

[0040] In one specific embodiment, the drive assembly surface 6 includes a plurality of drive surfaces 61 evenly arranged along the circumferential direction of the working surface of the tooth 1. For example... Figure 1 As shown, the driving surface 61 includes a first edge 611 and a second edge 612 arranged sequentially along the circumference of the core tooth 1. The first edge 611 and the second edge 612 are the highest and lowest positions of the driving surface 61, respectively. The connecting surface between the first edge 611 and the second edge 612 is an inclined surface or a curved surface. In this configuration, when the driving assembly surface 6 is subjected to an axial force, the axial force will generate an inclined component force under the action of the connecting surface between the first edge 611 and the second edge 612, thereby driving the core tooth 1, on which the driving assembly surface 6 is provided, to rotate relative to the rotating sleeve 2. It can be installed on the cutting tooth position of a conventional PDC drill bit and can automatically rotate during drilling without the need for a side rotation angle. It is interchangeable with conventional PDC cutting teeth, which is beneficial for the widespread application of rotating teeth.

[0041] In a preferred embodiment, both the first edge 611 and the second edge 612 are configured to be inclined relative to the radial line 14 of the core tooth 1, which refers to the straight line containing the diameter of the core tooth 1. That is, the extensions of the first edge 611 and the second edge 612 do not pass through the central axis of the self-driving rotating tooth 201. This configuration helps to remove rock debris during drilling.

[0042] According to a specific embodiment of the present invention, the driving assembly surface 6 is disposed on the circumferential edge of the working surface 12 of the tooth 1, and a tooth plane 5 is disposed at the center of the working surface 12. That is, each driving surface 61 of the driving assembly surface 6 is disposed on the outer side of the tooth plane 5.

[0043] In a preferred embodiment, such as Figure 1 As shown, a first chamfer 4 is provided on the radially outer side of the drive assembly surface 6, and a second chamfer 7 is provided on the radially inner side of the drive assembly surface 6.

[0044] In a preferred embodiment, the angle of the first chamfer 4 is in the range of 30°-60°, which is beneficial to improving the impact resistance, aggression, rotational speed and cutting performance of the tooth.

[0045] In a preferred embodiment, the angle of the second chamfer 7 is in the range of 1°-20°, which is beneficial to improving the impact resistance, aggression, rotational speed and cutting performance of the tooth.

[0046] In one embodiment, adjacent driving surfaces 61 are connected end to end along the circumferential direction.

[0047] In a specific embodiment, such as Figure 2 As shown, an annular groove 8 is provided between the tooth plane 5 and the drive assembly surface 6. At this time, the shape of the radial inner side of each drive surface 61 of the drive assembly surface 6 is adapted to the annular groove 8, and rounded corners are provided at the junction of the annular groove 8 and the tooth plane 5, the junction of the annular groove 8 and each drive surface 61 of the drive assembly surface 6, and the bottom of the annular groove 8.

[0048] It should be noted that, although the present invention only shows Figure 1 and Figure 2 The two drive assembly surface 6 structures are described, but other drive assembly surface 6 structures that can achieve self-driven rotation implemented by those skilled in the art in combination with the prior art should be within the protection scope of the present invention.

[0049] According to the present invention, such as Figure 3As shown, the mandrel 1 is connected to the rotating sleeve 2 via a retaining spring 3. Specifically, a first retaining groove is provided on the outer wall of the small diameter portion 103 of the mandrel 102, and a second retaining groove is provided on the inner wall of the rotating sleeve 2. When the mandrel 102 is inserted into the rotating sleeve 2, the first retaining groove corresponds to the second retaining groove, and the retaining spring 3 is disposed in the first and second retaining grooves, thereby enabling the mandrel 1 to rotate and engage with the rotating sleeve 2.

[0050] According to the present invention, such as Figure 4 As shown, in another embodiment, ball grooves 9 are provided on the outer wall of the tooth 1 and the inner wall of the rotating sleeve 2, and bearing balls 10 are provided in the ball grooves 9. The bearing balls 10 enable the tooth 1 and the rotating sleeve 2 to rotate in a rotatable manner, which can further reduce the friction between the tooth 1 and the rotating sleeve 2 when they rotate relative to each other.

[0051] Furthermore, a ball-filling hole 11 is provided on the sleeve wall of the rotating sleeve 2 to connect to the ball groove 9. Specifically, the ball-filling hole 11 is arranged radially along the rotating sleeve 2, with one end connected to the outer wall of the rotating sleeve 2 and the other end connected to the ball groove 9. During installation, the mandrel 102 of the mandrel 1 is first inserted into the rotating sleeve 2, so that the mandrel 102 and the ball groove 9 of the rotating sleeve 2 cooperate to form an annular space that can accommodate the bearing ball 10. Then, the bearing ball 10 is injected into the ball groove 9 through the ball-filling hole 11. During the injection of the bearing ball 10, the mandrel 1 rotates relative to the rotating sleeve 2, so that the injected bearing ball 10 can rotate with the mandrel 1, allowing subsequent bearing balls 10 to enter the ball groove 9. After all the bearing balls 10 are injected into the ball groove 9, the ball-filling hole 11 is sealed with a plug to prevent the bearing balls 10 from escaping.

[0052] According to the present invention, a drill bit 200 is also provided, such as Figure 5 As shown, the drill bit 200 includes a drill bit body 203 and cutter wings 204 disposed on the drill bit body 203. The structures of the drill bit body 203 and the cutter wings 204 are conventional PDC drill bit structures, well known to those skilled in the art, and will not be described in detail here. A self-driven rotating tooth 201 provided according to the present invention is disposed on the cutter wings 204. Specifically, the self-driven rotating tooth 201 can replace the conventional cutting teeth (conventional PDC teeth 202) on the cutter wings 204 of a conventional PDC drill bit.

[0053] In one specific embodiment, the drill bit 200 includes a self-driven rotating tooth 201, a conventional PDC tooth 202, a drill body 203, a cutter wing 204, a flow channel 205, a mandrel 206, a nozzle 207, an upper threaded groove 208, and a connector 209. Except for the self-driven rotating tooth 201, the remaining structures of the drill bit 200 are well known to those skilled in the art and will not be described in detail here. The self-driven rotating tooth 201 is arranged at a critical portion 210 of the cutter wing 204 of the drill bit. Specifically, in this embodiment, the critical portion 210 refers to the area near the junction of the outer surface and the top surface of the cutter wing 204.

[0054] Furthermore, the self-driven rotating tooth 201 can also be set in other parts of the blade 204. The number of self-driven rotating teeth 201 arranged on each blade 204 is not less than 1, and the number of rotating teeth is 3-25.

[0055] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-driven rotating gear, characterized in that, include: Rotating sleeve (2); A coaxially rotating tooth (1) is provided on the rotating sleeve (2). A drive assembly surface (6) is provided on the working surface (12) of the tooth (1). The drive assembly surface (6) is configured to allow the tooth (1) to rotate relative to the rotating sleeve (2) when subjected to axial force.

2. The self-driving rotating gear according to claim 1, characterized in that, The drive assembly surface (6) includes a plurality of drive surfaces (61) evenly arranged circumferentially along the working surface of the tooth (1).

3. The self-driving rotating gear according to claim 2, characterized in that, The driving surface (61) includes a first edge (611) and a second edge (612) arranged sequentially along the circumference of the tooth (1). The first edge (611) and the second edge (612) are the highest and lowest positions of the driving surface (61), respectively. The connecting surface between the first edge (611) and the second edge (612) is an inclined surface or a curved surface.

4. The self-driving rotating gear according to claim 3, characterized in that, Both the first edge (611) and the second edge (612) are configured to be inclined relative to the radial line (14) of the heart tooth (1).

5. The self-driving rotating gear according to any one of claims 1 to 4, characterized in that, The drive assembly surface (6) is located on the circumferential edge of the working surface (12) of the tooth (1), and a tooth plane (5) is provided at the center of the working surface (12).

6. The self-driving rotating gear according to claim 5, characterized in that, A first chamfer (4) is provided on the radially outer side of the drive assembly surface (6), and a second chamfer (7) is provided on the radially inner side of the drive assembly surface (6).

7. The self-driven rotating gear according to claim 5, characterized in that, An annular groove (8) is provided between the tooth plane (5) and the drive assembly surface (6).

8. The self-driving rotating gear according to any one of claims 1 to 7, characterized in that, The tooth (1) is connected to the rotating sleeve (2) via a snap ring (3).

9. The self-driving rotating gear according to any one of claims 1 to 7, characterized in that, Ball grooves (9) are provided on the outer wall of the tooth (1) and the inner wall of the rotating sleeve (2). Bearing balls (10) are provided in the ball grooves (9). Ball injection holes (11) connecting the ball grooves (9) are provided on the sleeve wall of the rotating sleeve (2).

10. A drill bit, comprising a drill bit body (203) and cutter blades (204) disposed on the drill bit body (203), characterized in that, The blade (204) is provided with self-driving rotating teeth according to any one of claims 1 to 9.

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