Cutting tooth

Abstract

The invention provides a cutting tooth which comprises a tooth column and a tooth crown, the tooth crown comprises a tip cone part, a first side part located on the tip cone part and a side sector of a second side part opposite to the first side part, the top end of the side sector intersects with the tip cone part, and the side sector extends from the peripheral end of the side sector to an inward concave cambered surface of the tip cone part. According to the cutting tooth, the temperature resistance of the cutting tooth can be improved while the outstanding attack performance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, and in particular to a cutting tooth. Background Art

[0002] With the development of drilling technology, drill bits have been widely used in oil fields, mines and engineering drilling. Improving drill bit design plays a vital role in reducing drilling costs. An important aspect of drill bit improvement is the optimization design of cutting teeth.

[0003] The cutting teeth of existing drill bits have various forms, such as the commonly used axe-shaped teeth, conical teeth and triangular teeth. These forms of cutting teeth have a relatively sharp structure and can cut into rocks with smaller and more concentrated force. However, during high-speed drilling, these forms of cutting teeth will violently rub against the rocks to generate extremely high cutting temperatures and convert them into friction heat. The superimposed thermal effect of the high formation temperature and the cutting friction heat causes the temperature of the drill bit to rise sharply, which in turn causes a large temperature gradient inside the cutting teeth, resulting in uneven thermal expansion of the cutting teeth and large thermal stress, which ultimately causes thermal wear and deformation of the cutting teeth, seriously reducing the performance of the cutting teeth in cutting and crushing rocks.

[0004] There are some other forms of cutting teeth in existing drill bits that use multi-dimensional cutting structures to improve heat conversion efficiency, but this also greatly increases the manufacturing cost of the cutting teeth and cannot be widely used.

[0005] In the process of drilling deep formations, the cutting teeth of the drill bit are required to have excellent comprehensive performance in terms of high engagement, low heat generation and low cost. The cutting teeth of the drill bit in the prior art cannot fully meet the drilling needs of deep formations. Summary of the invention

[0006] An object of the present invention is to provide a cutting tooth so as to improve the temperature resistance of the cutting tooth while having outstanding attack performance.

[0007] According to the present invention, a cutting tooth includes a tooth column and a tooth crown, wherein the tooth crown includes a top cone portion and a side fan surface located at a first side portion of the top cone portion and a second side portion opposite to the first side portion, the top end of the side fan surface intersects with the top cone portion, and the side fan surface extends from its outer peripheral end to the top cone portion in an inwardly concave arc surface.

[0008] In a preferred embodiment, the cutting tooth further comprises an inclined portion located at a third side portion of the top cone portion, and a top end of the inclined portion converges from the third side portion of the top cone portion to the top cone portion.

[0009] In a preferred embodiment, the upper surface of the inclined portion is connected to the first end surface of the side fan surface.

[0010] In a preferred embodiment, the inclined portion includes a first inclined portion and a second inclined portion formed integrally, the first inclined portion is formed by the inclined surface of a portion of the tooth column located on the third side of the top cone portion, the second inclined portion is formed by the inclined surface of a portion of the tooth crown located on the third side of the top cone portion, and the second inclined portion is located above the first inclined portion.

[0011] In a preferred embodiment, the tooth crown further comprises a third inclined portion located on a fourth side portion of the top cone portion opposite to the third side portion, and a top end of the third inclined portion converges from the fourth side portion of the top cone portion to the top cone portion.

[0012] In a preferred embodiment, the third inclined portion is connected to the second end surface of the side fan surface, and the third inclined portion is located between the second end surfaces of two side fan surfaces.

[0013] In a preferred embodiment, the inclined surface portion forms an angle of 60° to 80° with the bottom surface of the crown in the longitudinal direction.

[0014] In a preferred embodiment, the inclined portion forms an angle of 45°-70° with the ridge line of the top cone portion in the transverse direction.

[0015] In a preferred embodiment, the top cone has a curvature radius of 0.35-1 mm, a central angle of 35°-45°, and a length of 2-8 mm.

[0016] In a preferred embodiment, the curvature radius of the side sector is 9 mm, the central angle is 50°, and the distance between the outer end point and the bottom surface of the crown is greater than or equal to 1 mm.

[0017] In a preferred embodiment, the curvature of the concave surface of the side sector extending from its outer peripheral end to the top cone portion gradually increases.

[0018] The present invention comprises a tooth column and a tooth crown, the tooth crown comprises a top cone portion and a first side portion located at the top cone portion and a side fan surface at a second side portion opposite to the first side portion, the top end of the side fan surface intersects with the top cone portion, and the side fan surface extends from its outer peripheral end to the top cone portion with an inwardly concave arc surface. On the one hand, the side fan surface extends with an inwardly concave arc surface and intersects with the top cone portion, and the top cone portion and the side fan surface are concave arc surfaces at the connection, so that the attack structure of the cutting tooth becomes a convex and sharp cone structure. Therefore, the cutting tooth of the present invention has a more prominent attack on hard formations. The impact performance can be improved, and at the same time, the cutting force required for the cutting teeth to cut into the rock can be effectively reduced to avoid the formation of stress concentration; on the other hand, since the side fan surface adopts a concave arc surface, the movement path of the drilling fluid can be increased, the heat dissipation of the tooth surface can be increased, and the temperature of the tooth surface can be reduced, so that the high temperature generated by the friction of the rock cuttings on the tooth surface can be effectively dispersed during the rock breaking process, and the temperature resistance of the cutting teeth can be improved. In addition, during the rock breaking process, the side fan surface of the concave arc surface allows the rock cuttings to move more smoothly along the concave arc surface, thereby improving the chip removal ability of the cutting teeth. The cutting teeth described in the present invention have a simple overall structure and can be widely manufactured, produced and applied.

[0019] The present invention includes a bevel portion located on the third side of the top cone portion, and the top of the bevel portion intersects with the top cone portion from the third side of the top cone portion. This can make the attack structure of the cutting tooth a more convex and sharp conical structure, have more outstanding attack performance on hard formations, further reduce the cutting force required for the cutting tooth to cut into the rock, and avoid stress concentration. In addition, the bevel portion allows rock chips to move more smoothly along the bevel, thereby improving the chip removal ability of the cutting tooth.

[0020] The present invention connects the upper surface of the bevel portion with the first end surface of the side fan surface. During the rock breaking process, the stone chips generated can be discharged more smoothly through the concave arc structure of the side fan surface and the bevel portion with an inclined surface, thereby improving the chip removal ability of the cutting tooth.

[0021] The present invention includes a third inclined portion located on the fourth side portion opposite to the top cone portion and the third side portion, and the top end of the third inclined portion converges from the fourth side portion of the top cone portion to the top cone portion. During the rock breaking process, the stone chips generated can be discharged more smoothly through the third inclined portion with an inclined surface, thereby improving the chip removal ability of the cutting tooth.

[0022] The present invention gradually increases the curvature of the concave curved surface extending from the outer peripheral end of the side fan surface to the top cone portion, which can further increase the movement path of the drilling fluid, increase the heat dissipation of the tooth surface, and reduce the temperature of the tooth surface during the drilling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional schematic diagram schematically shows the overall structure of the cutting tooth according to the present invention;

[0024] Figure 2 Schematically shows a front view of a cutting tooth according to the present invention;

[0025] Figure 3 Schematically shows a top view of a cutting tooth according to the present invention;

[0026] Figure 4 Schematically shows a side view of a cutting tooth according to the present invention;

[0027] Figure 5 A rear view of a cutting tooth according to the invention is schematically shown.

[0028] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "side", "top", "bottom", "inside", "outside", "concave", "convex", "vertical", "vertical and horizontal", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the term "connection" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figures 1 to 5As shown, the cutting tooth 100 of the present invention comprises a tooth column 1 and a tooth crown 2, wherein the tooth crown 2 is arranged on the upper surface of the tooth column 1, the tooth column 1 is constructed as a columnar body, and the bottom surface of the tooth crown 2 is a plane. The tooth crown 2 comprises a top cone 3 and a side fan surface 4 located at a first side portion of the top cone 3 and a second side portion opposite to the first side portion, the top cone 3 has an arc surface convex outward, the top ends of the two side fan surfaces 4 respectively intersect with the top cone 3 from the first side portion and the second side portion of the top cone 3, and the side fan surfaces 4 extend from their outer peripheral ends to the top cone 3 with an inwardly concave arc surface. The outer peripheral ends of the side fan surfaces 4 are spaced a certain distance from the bottom surface of the tooth crown 2 in the vertical direction.

[0033] The present invention comprises a tooth column 1 and a tooth crown 2, the tooth crown 2 comprises a top cone 3 and a side fan surface 4 located at a first side portion of the top cone 3 and a second side portion opposite to the first side portion, the top end of the side fan surface 4 intersects with the top cone 3 and the side fan surface 4 extends from its outer peripheral end to the top cone 3 in a concave arc surface. On the one hand, the side fan surface 4 extends in a concave arc surface and intersects with the top cone 3, and the top cone 3 and the side fan surface 4 are concave arc surfaces at the connection, so that the attack structure of the cutting tooth 100 becomes a convex and sharp conical structure. Therefore, the cutting tooth 100 described in the present invention has a better impact on hard formations. The outstanding attack performance can also effectively reduce the cutting force required for the cutting tooth 100 to cut into the rock, avoiding the formation of stress concentration; on the other hand, since the side fan surface 4 adopts a concave arc surface, it can increase the movement path of the drilling fluid, increase the heat dissipation of the tooth surface, and reduce the temperature of the tooth surface, so that the high temperature generated by the friction of the rock cuttings on the tooth surface can be effectively dispersed during the rock breaking process, and the heat resistance of the cutting tooth 100 can be improved. In addition, during the rock breaking process, the concave arc side fan surface 4 allows the rock cuttings to move more smoothly along the concave arc surface, thereby improving the chip removal ability of the cutting tooth 100. The cutting tooth 100 described in the present invention has a simple overall structure and can be widely manufactured, produced and applied.

[0034] In one or more embodiments, the curvature of the concave surface of the side sector surface 4 extending from the outer peripheral end thereof to the top cone portion 3 gradually increases.

[0035] The present invention gradually increases the curvature of the concave arc surface extending from the outer peripheral end of the side fan surface 4 to the top cone portion 3, which can further increase the movement path of the drilling fluid during the drilling process, increase the heat dissipation of the tooth surface, and reduce the tooth surface temperature.

[0036] In one or more embodiments, the top cone 3 is located in the center of the crown 2 .

[0037] In one or more embodiments, the cutting tooth 100 described in the present invention also includes a bevel portion 5 located on the third side of the top cone portion 3, the bevel portion 5 is constructed as an inclined plane, and the top end of the bevel portion 5 intersects with the top cone portion 3 from the third side of the top cone portion 3.

[0038] The present invention includes a bevel portion 5 located on the third side of the top cone portion 3, and the top of the bevel portion 5 intersects with the top cone portion 3 from the third side of the top cone portion 3. This can make the attack structure of the cutting tooth 100 a more convex and sharp conical structure, have more outstanding attack performance on hard formations, further reduce the cutting force required for the cutting tooth 100 to cut into the rock, and avoid stress concentration. In addition, the bevel portion 5 allows rock chips to move more smoothly along the bevel, thereby improving the chip removal ability of the cutting tooth 100.

[0039] In one or more embodiments, the upper surface of the sloped portion 5 is connected to the first end surface of the side fan surface 4 .

[0040] The present invention connects the upper surface of the bevel portion 5 with the first end surface of the side fan surface 4. During the rock breaking process, the stone chips generated can be discharged more smoothly through the concave arc structure of the side fan surface 4 and the bevel portion 5 with an inclined surface, thereby improving the chip discharge capacity of the cutting tooth 100.

[0041] In one or more embodiments, the inclined portion 5 includes an integrally formed first inclined portion 51 and a second inclined portion 52, wherein the first inclined portion 51 is formed by the inclined surface of a portion of the tooth column 1 located at the third side of the top cone portion 3, and the second inclined portion 52 is formed by the inclined surface of a portion of the tooth crown 2 located at the third side of the top cone portion 3. The second inclined portion 52 is located above the first inclined portion 51, and the upper surface of the second inclined portion 52 is connected to the first end surface of the side fan surface 4 at the third side of the top cone portion 3, and the top end of the second inclined portion 52 intersects with the top cone portion 3 from the third side of the top cone portion 3.

[0042] In one or more embodiments, the tooth crown 2 further includes a third inclined portion 6 located at the fourth side of the top cone 3, wherein the fourth side is opposite to the third side, and the third inclined portion 6 is configured as an inclined plane. The third inclined portion 6 is formed by an inclined surface of a portion of the tooth crown 2 located at the fourth side of the top cone 3. The top end of the third inclined portion 6 intersects with the top cone 3 from the fourth side of the top cone 3.

[0043] The present invention includes a third inclined portion 6 located on the fourth side portion opposite to the top cone portion 3 and the third side portion, and the top end of the third inclined portion 6 intersects with the top cone portion 3 from the fourth side portion of the top cone portion 3. During the rock breaking process, the stone chips generated can be discharged more smoothly through the third inclined portion 6 with an inclined surface, thereby improving the chip discharge capacity of the cutting tooth 100.

[0044] In one or more embodiments, the third inclined portion 6 is connected to the second end surface of the side fan surface 4 , and the third inclined portion 6 is located between the second end surfaces of the two side fan surfaces 4 .

[0045] The present invention is connected to the second end face of the side fan face 4 through the third inclined portion 6, and the third inclined portion 6 is located between the second end faces of the two side fan faces 4. During the rock breaking process, the stone chips generated can be discharged more smoothly through the concave arc structure of the side fan face 4 and the third inclined portion 6 with an inclined surface, thereby improving the chip discharge capacity of the cutting tooth 100.

[0046] In one or more embodiments, the inclined portion 5 is 60° to 80° with the bottom surface of the crown 2 in the longitudinal direction, and 45°-70° with the ridge line of the top cone 3 in the transverse direction. The "ridge line" is a virtual line of the top cone 3 along its length direction, and the "ridge line" of the top cone 3 is parallel to the bottom surface of the tooth column 1.

[0047] In one or more embodiments, the curvature radius of the top cone 3 is 0.35-1 mm, the central angle is 35°-45°, and the length of the top cone 3 is 2-8 mm. It should be noted that when the cutting tooth 100 is used in a heterogeneous formation (such as a gravel layer), the central angle of the top cone 3 is relatively large.

[0048] In one or more embodiments, the curvature radius of the side sector 4 is 9 mm, the central angle is 50°, and the distance between the outer end point and the bottom surface of the polycrystalline diamond layer is greater than or equal to 1 mm.

[0049] In one or more embodiments, the third inclined portion 6 forms an angle of 15° with the bottom surface of the crown 2 .

[0050] In one or more embodiments, the cutting tooth 100 described in the present invention further includes a rounded corner surface at the periphery of the cutting surface for resisting impact and wear, and the radius of the rounded corner surface at the periphery of the cutting surface is 0.1 mm, and the center angle is 90°.

[0051] Beneficial effects of the present invention: The present invention has a simple structure and a reasonable design. The arc structure of the top cone portion 3 can ensure the impact resistance of the cutting tooth 100, and its combination with the side fan surface 4 and the bevel portion 5 makes the attack structure of the cutting tooth 100 described in the present invention a sharp pyramidal structure, which has more prominent aggressiveness when drilling deep hard formations. At the same time, it can also effectively reduce the cutting force required for the cutting tooth 100 to cut into the rock and avoid the formation of stress concentration. The side fan surface 4 adopts a concave arc surface, which can effectively disperse the high temperature generated by the tooth surface during rock breaking and improve the temperature resistance of the cutting tooth. In addition, the side fan surface 4, the third inclined portion 6, and the bevel portion 5 can improve the chip removal ability of the cutting tooth 100.

[0052] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cutting tooth, comprising a tooth column and a tooth crown, wherein the tooth crown comprises a top cone portion and a side fan surface located at a first side portion of the top cone portion and a second side portion opposite to the first side portion, the top end of the side fan surface intersects with the top cone portion, and the side fan surface extends from its outer peripheral end to the top cone portion in an inwardly concave arc surface.

2. The cutting tooth according to claim 1, characterized in that: The invention also includes an inclined portion located on the third side of the top cone portion, wherein a top end of the inclined portion converges from the third side of the top cone portion to the top cone portion.

3. The cutting tooth according to claim 2, characterized in that: The upper surface of the inclined surface is connected to the first end surface of the side fan surface.

4. The cutting tooth according to claim 3, characterized in that: The inclined portion includes a first inclined portion and a second inclined portion formed integrally, the first inclined portion being formed by the inclined surface of a portion of the tooth column located on the third side of the top cone portion, the second inclined portion being formed by the inclined surface of a portion of the tooth crown located on the third side of the top cone portion, and the second inclined portion being located above the first inclined portion.

5. The cutting tooth according to claim 3, characterized in that: The tooth crown further includes a third inclined portion located at a fourth side portion of the top cone portion opposite to the third side portion, and a top end of the third inclined portion converges from the fourth side portion of the top cone portion to the top cone portion.

6. The cutting tooth according to claim 5, characterized in that: The third inclined portion is connected to the second end surface of the side fan surface, and the third inclined portion is located between the second end surfaces of the two side fan surfaces.

7. The cutting tooth according to claim 2, characterized in that: The inclined surface is 60° to 80° with the bottom surface of the crown in the longitudinal direction.

8. The cutting tooth according to claim 7, characterized in that: The inclined portion forms an angle of 45°-70° with the ridge line of the top cone portion in the transverse direction.

9. The cutting tooth according to claim 1, characterized in that: The top cone has a curvature radius of 0.35-1 mm, a central angle of 35°-45°, and a length of 2-8 mm.

10. The cutting tooth according to claim 1, characterized in that: The curvature radius of the side sector is 9 mm, the central angle is 50°, and the distance between the outer end point and the bottom surface of the crown is greater than or equal to 1 mm.

11. The cutting tooth according to claim 1, wherein the curvature of the concave arc surface of the side sector surface extending from the outer peripheral end thereof to the top cone portion gradually increases.

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