Non-planar cutting tooth

Abstract

The non-planar cutting tooth comprises a tooth column and a tooth crown, the tooth crown comprises a tip cone part with a convex arc structure, 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 the tip cone part in an inclined plane mode. According to the non-planar cutting tooth provided by the invention, the non-planar cutting tooth has high attack performance and outstanding impact resistance at the same time.

Description

Technical Field

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

[0002] As the demand for energy continues to increase, my country's oil and gas exploration and development has gradually shifted to more complex and harsh geological environments, which has led to more and more technical difficulties in drilling. As the core structure of the drill bit for breaking rock, the rock breaking performance of the cutting teeth has received more and more attention, and the special-shaped tooth technology has gradually developed.

[0003] Special-shaped teeth with different structures can provide targeted and customized rock-breaking capabilities for different drilling conditions and formation environments, thereby improving rock-breaking efficiency and ensuring the reliability and stability of the drill bit. However, due to the extremely harsh drilling environments currently in many cases, the bottom hole drill bit often experiences violent and unexpected vibrations, which can cause damage to the cutting teeth and the bottom drilling tool, greatly reducing the rock-breaking efficiency. Therefore, the cutting teeth need to have good impact resistance while ensuring a high rock-breaking efficiency. Summary of the invention

[0004] One object of the present invention is to provide a non-planar cutting tooth that has strong attack performance and outstanding impact resistance.

[0005] According to the present invention, a non-planar cutting tooth includes a tooth column and a tooth crown, wherein the tooth crown includes a top cone portion having a convex arc structure 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, wherein 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 inclined plane.

[0006] In a preferred embodiment, the non-planar 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.

[0007] In a preferred embodiment, the upper surface of the inclined portion is connected to the first end surface of the side fan surface.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] In a preferred embodiment, the top cone has a curvature radius of 3 mm, a central angle of 30°-50°, and a length of 4-8 mm.

[0014] In a preferred embodiment, the distance between the outer end point of the side sector and the bottom surface of the tooth crown is greater than or equal to 1 mm.

[0015] The present invention comprises a tooth crown including a top cone portion with a convex arc structure 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 inclined plane. On the one hand, the convex arc surface of the top cone portion can make the non-planar cutting tooth have a stronger aggressiveness, which can effectively reduce the cutting force required for the non-planar cutting tooth to cut into the rock and avoid the formation of stress concentration; on the other hand, the side fan surface extends in an inclined plane and intersects with the top cone portion, so that the top cone portion and the side fan surface directly and smoothly transition from the inclined plane to the convex arc surface at the connection point, thereby making the attack structure of the non-planar cutting tooth a relatively gentle conical structure. Therefore, the non-planar cutting tooth described in the present invention has more outstanding impact resistance in the process of drilling into hard formations, avoids damage or collapse of the non-planar cutting tooth, improves rock breaking efficiency and reduces drilling costs. In addition, since the two side fan surfaces and the top cone are combined into a cone-like body, the cutting teeth can cut into the rock more easily and reduce the cutting force required to cut into the rock. During cutting, the two side fan surfaces can disperse the required cutting force and avoid stress concentration at the top cone.

[0016] The non-planar cutting tooth of the present invention has a simple overall structure and can be widely manufactured, produced and applied.

[0017] The present invention includes a bevel portion located on the third side of the top cone portion, and the top end 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 non-planar 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 non-planar 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 non-planar cutting tooth.

[0018] 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 inclined plane of the side fan surface and the bevel portion with an inclined surface, thereby improving the chip removal capacity of the non-planar cutting tooth.

[0019] 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 intersects with the top cone portion from the fourth side portion of 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 capacity of the non-planar cutting tooth.

[0020] The present invention is connected to the second end face of the side fan face through the third inclined portion, and the third inclined portion is located between the second end faces of the two side fan faces. During the rock breaking process, the stone chips generated can be discharged more smoothly through the inclined plane of the side fan face and the third inclined portion with an inclined surface, thereby improving the chip removal capacity of the non-planar cutting tooth.

[0021] The curvature radius of the top cone portion of the present invention is 3 mm, which can avoid impact damage.

[0022] The non-planar cutting teeth of the present invention have strong impact resistance and are suitable for impact drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 Schematically showing a front view of a non-planar cutting tooth according to the present invention;

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

[0026] Figure 4 Schematically showing a side view of a non-planar cutting tooth according to the present invention;

[0027] Figure 5 A rear view of a non-planar cutting tooth according to the present 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", "inner", "outer", "convex", "vertical", "vertical and horizontal", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 5 As shown, the non-planar 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 configured as a columnar body, and the bottom surface of the tooth crown 2 is configured as 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 protruding 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 in an inclined plane. 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 crown 2 including a top cone portion 3 with a convex arc structure and a side fan surface 4 located at a first side portion of the top cone portion 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 portion 3 and the side fan surface 4 extends from its outer peripheral end to the top cone portion 3 in an inclined plane. On the one hand, the convex arc surface of the top cone portion 3 can make the non-planar cutting tooth 100 more aggressive, which can effectively reduce the cutting force required for the non-planar cutting tooth 100 to cut into the rock and avoid the formation of stress concentration.

[0034] On the other hand, the side fan surface 4 extends in an inclined plane and intersects with the top cone 3, so that the top cone 3 and the side fan surface 4 are directly and smoothly transitioned from the inclined plane to the convex arc surface at the connection point, so that the attack structure of the non-planar cutting tooth 100 becomes a relatively gentle conical structure. Therefore, the non-planar cutting tooth 100 described in the present invention has more outstanding impact resistance during drilling into hard formations, avoiding damage or collapse of the non-planar cutting tooth 100, improving rock breaking efficiency, and reducing drilling costs. In addition, since the two side fan surfaces 4 and the top cone 3 are combined into a cone-like body, the cutting tooth can cut into the rock more easily, reducing the cutting force required for cutting into the rock. During cutting, the two side fan surfaces 4 can disperse the required cutting force and avoid stress concentration at the top cone 3.

[0035] The non-planar cutting tooth 100 of the present invention has a simple overall structure and can be widely manufactured, produced and applied.

[0036] The non-planar cutting tooth 100 of the present invention has strong impact resistance and is suitable for impact drilling operations.

[0037] In one or more embodiments, the top cone 3 is located in the center of the crown 2 .

[0038] In one or more embodiments, the non-planar 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.

[0039] The present invention includes a bevel portion 5 located on the third side of the top cone portion 3, 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, so that the attack performance of the attack structure of the top cone portion 3 can be increased, and the cutting force required for the non-planar cutting tooth 100 to cut into the rock can be further reduced to 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 non-planar cutting tooth 100.

[0040] In one or more embodiments, the upper surface of the sloped portion 5 is connected to the first end surface of the side sector 4 .

[0041] 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 inclined plane of the side fan surface 4 and the bevel portion 5 with an inclined surface, thereby improving the chip removal capacity of the non-planar cutting tooth 100.

[0042] 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.

[0043] 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.

[0044] 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 non-planar cutting tooth 100.

[0045] 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 .

[0046] 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 inclined plane of the side fan face 4 and the third inclined portion 6 with an inclined surface, thereby improving the chip discharge capacity of the non-planar cutting tooth 100.

[0047] 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.

[0048] In one or more embodiments, the curvature radius of the top cone 3 is 3 mm, the central angle is 30°-50°, and the length of the top cone 3 is 4-8 mm. The top cone of the present invention has a large curvature radius, which can avoid impact damage. It should be noted that when the non-planar cutting tooth 100 is used in a non-homogeneous formation (such as a gravel layer), the central angle of the top cone 3 is relatively large.

[0049] In one or more embodiments, the distance between the outer end point of the side sector surface 4 and the bottom surface of the tooth crown 2 is greater than or equal to 1 mm.

[0050] In one or more embodiments, the third inclined portion 6 forms an angle of 15° with the bottom surface of the crown 2 .

[0051] In one or more embodiments, the non-planar 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 central angle is 90°.

[0052] Beneficial effects of the present invention: The present invention has a simple structure and a reasonable design. The convex arc structure of the top cone 3 can not only ensure the high attack performance of the non-planar cutting tooth 100 against hard and difficult-to-drill formations, but also effectively reduce the cutting force required for the non-planar cutting tooth 100 to cut into the rock, avoid the formation of stress concentration, and also reduce the risk of excessive sharp angle structures being damaged by hard rocks, thereby improving the impact resistance of the cutting tooth. The side fan surface 4 adopts an inclined plane, and the top cone 3 and the side fan surface 4 directly and smoothly transition from the inclined plane to the convex arc surface at the connection, so that the attack structure of the non-planar cutting tooth 100 becomes a relatively gentle protruding and sharp conical structure. Therefore, the non-planar cutting tooth 100 described in the present invention has more outstanding impact resistance against hard formations during the process of drilling into hard formations, avoiding damage and collapse of the non-planar cutting tooth 100, improving rock breaking efficiency, and reducing drilling costs. In addition, the side fan surface 4, the third inclined portion 6, and the inclined portion 5 can improve the chip removal capacity of the non-planar cutting tooth 100.

[0053] 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 non-planar cutting tooth, comprising a tooth column and a tooth crown, wherein the tooth crown comprises a top cone portion having a convex arc structure 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, wherein 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 inclined plane.

2. The non-planar 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 non-planar 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 non-planar 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 non-planar 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 non-planar 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 non-planar 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 non-planar 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 non-planar cutting tooth according to claim 1, characterized in that: The top cone has a curvature radius of 3 mm, a central angle of 30°-50°, and a length of 4-8 mm.

10. The non-planar cutting tooth according to claim 1, characterized in that: The distance between the outer end point of the side sector and the bottom surface of the tooth crown is greater than or equal to 1 mm.

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