Multi-curved-surface anti-impact PDC drill tooth

Abstract

The utility model belongs to the technical field of drill bits, and particularly relates to a multi-curved-surface anti-impact PDC (polycrystalline diamond compact) drill tooth, which comprises a base body and a polycrystalline diamond layer arranged at the end part of the base body, and is characterized in that a plurality of arc-shaped cutting edges are distributed on the end surface of the polycrystalline diamond layer around a central shaft; a chip groove is formed by a gap between every two adjacent cutting edges, the center of the end face of the polycrystalline diamond layer is an arc face which is concave inwards, and the outer edge of the arc face is connected with the chip grooves; an inclined face is arranged on the outer side, away from the center axis of the polycrystalline diamond layer, of the cutting edge and extends to the peripheral face of the polycrystalline diamond layer. The PDC drill bit is used for solving the technical problems that the rationality of the edge type of a cutting edge on an existing PDC drill bit is poor, and the drilling efficiency is poor.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill bits, and in particular relates to a multi-curved impact-resistant PDC drill tooth. Background Art

[0002] Since the 1970s, PDC (polycrystalline diamond composite) drill bits have gradually replaced diamond drill bits when drilling in soft to medium-hard formations in oil and gas fields, and have been widely used in geological drilling and oil and gas well drilling. PDC drill bit research has become increasingly mature, drilling technology has been increasingly improved, and technical and economic indicators have been continuously improved, which has attracted great attention from the geological drilling community.

[0003] When drilling in oil and gas fields, the drill bit may be subjected to various vibrations, such as axial vibration, lateral (radial) vibration and twisting vibration. The influence of vibration makes the wellbore shape irregular and deviates from the designed direction, thus causing the problem of poor drilling efficiency. At present, the PDC drill bits on the market are simple in structure and the cutting edge shape is not optimized enough to eliminate the influence of vibration, resulting in poor drilling efficiency. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a multi-curved impact-resistant PDC drill tooth, which is used to solve the technical problem that the cutting edge profile of the current PDC drill bit is poorly rational, resulting in poor drilling efficiency.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is: a multi-curved impact-resistant PDC drill tooth, which includes a base and a polycrystalline diamond layer arranged at the end of the base, characterized in that a plurality of arc-shaped cutting edges are distributed around the central axis on the end face of the polycrystalline diamond layer, and the intervals between adjacent cutting edges form a chip groove, the center of the end face of the polycrystalline diamond layer is an inwardly concave arc surface, and the outer edge of the arc surface is connected to the chip groove; the outer side of the cutting edge away from the central axis of the polycrystalline diamond layer is provided with an inclined surface, and the inclined surface extends to the outer peripheral surface of the polycrystalline diamond layer.

[0006] Preferably, the number of the cutting edges is 2-12.

[0007] Preferably, the cutting edge is processed into a curved chamfered slope on the inner side of the central axis of the polycrystalline diamond layer.

[0008] Preferably, the curvature radius of the chamfered slope is 1-3 mm.

[0009] Preferably, the angle between the inclined surface and the central axis of the polycrystalline diamond layer is 55-15°.

[0010] Preferably, the bottom of the chip removal groove is arc-shaped, and the radius of curvature is 0.5-5mm.

[0011] Preferably, the radius of curvature of the arc surface is 15-35 mm.

[0012] The beneficial effects of adopting the technical solution of the utility model are:

[0013] The utility model discloses a polycrystalline diamond layer of adjacent arc-shaped cutting edges on the end face of the polycrystalline diamond layer separated by a chip groove, the arc-shaped cutting edges are distributed around the central axis of the polycrystalline diamond layer, the outer side of the cutting edge is provided with an inclined surface extending to the outer periphery of the polycrystalline diamond layer, which can improve the friction between the drill teeth and the rock formation at the bottom of the hole, realize the balance of each drill tooth in the whole drilling tool, offset the influence of drilling vibration, and ensure the stability of the drilling platform; the center of the end face of the polycrystalline diamond layer is provided with an inwardly concave arc surface, the outer edge of the arc surface is connected to the chip groove, the chip holding and chip removal capacity of the drill teeth is increased, the mud packing phenomenon is reduced, and the service life of the composite sheet is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a first embodiment of a multi-curved impact-resistant PDC drill bit;

[0015] Figure 2 It is a top view schematic diagram of a first embodiment of a multi-curved impact-resistant PDC drill bit;

[0016] Figure 3 for Figure 2 Schematic diagram of the AA section;

[0017] Figure 4 It is a schematic diagram of a second embodiment of a multi-curved impact-resistant PDC drill bit;

[0018] Figure 5 It is a top view schematic diagram of a second embodiment of a multi-curved impact-resistant PDC drill bit;

[0019] Figure 6 for Figure 5 Schematic diagram of the BB section.

[0020] in, Figure 1-6 In the figure, 1-polycrystalline diamond layer, 101-arc surface, 102-chip groove, 103-cutting edge, 1031-bevel surface, 2-substrate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and do not limit the scope of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The specific embodiments are as follows:

[0025] Embodiment 1, as Figure 1-3 As shown, a multi-curved impact-resistant PDC drill tooth comprises a matrix 2 and a polycrystalline diamond layer 1. The polycrystalline diamond layer 1 is fixedly connected to the end of the matrix 2.

[0026] The end surface of the polycrystalline diamond layer 1 principle substrate 2 is provided with 2-12 cutting edges 103, and the side of the cutting edge 103 close to the central axis of the polycrystalline diamond layer 1 is in an arc style. The cutting edge 103 is arranged on the end surface of the polycrystalline diamond layer 1 around the central axis of the polycrystalline diamond layer 1, and its arc is located on the side close to the central axis of the polycrystalline diamond layer 1. The side of the cutting edge 103 away from the central axis of the polycrystalline diamond layer 1 is provided with an inclined surface 1031, and the inclined surface 1031 extends to the outer peripheral surface of the polycrystalline diamond layer 1.

[0027] On the end face of the polycrystalline diamond layer 1, adjacent cutting edges are spaced apart and a chip removal groove is formed at the spaced apart positions. In the center of the end face of the polycrystalline diamond layer 1 is an inwardly concave arc surface 101, and the outer edge of the arc surface 101 is connected to the chip removal groove 102.

[0028] Furthermore, a chamfered slope surface is processed on the inner side of the cutting edge 103 close to the central axis of the polycrystalline diamond layer 1. The chamfered slope surface is a curved surface, and the curvature radius of the chamfered slope surface is 1-3 mm.

[0029] Furthermore, the angle between the inclined surface 1031 and the central axis of the polycrystalline diamond layer 1 is 55-15°.

[0030] Furthermore, the bottom of the chip groove 102 is arc-shaped, and the radius of curvature is 0.5-5 mm.

[0031] Furthermore, the radius of curvature of the arc surface is 15-35 mm.

[0032] In this embodiment, if Figure 1-3 As shown, four cutting edges 103 are provided as an example for explanation, and the four cutting edges 103 are evenly distributed around the central axis of the polycrystalline diamond layer 1. The curvature radius of the chamfered slope surface on the inner side of the arc-shaped cutting edge 103 is 1.5 mm, and the angle between the inclined surface 1031 on the outer side of the cutting edge 103 and the central axis of the polycrystalline diamond layer 1 is 45°. The curvature radius of the arc surface 101 at the center of the end face of the polycrystalline diamond layer 1 is 20 mm. And, the curvature radius of the arc of the chip groove 102 is 1.5 mm.

[0033] When a multi-curved impact-resistant PDC drill tooth of the present embodiment is in use, an inclined surface 1031 extending to the outer peripheral surface of the polycrystalline diamond layer 1 is arranged on the outer side of the arc-shaped cutting edge 103 to improve drilling sharpness and increase drilling efficiency. The chip cutting edges 103 are separated by a chip groove 102, and the bottom of the chip groove 102 is arranged in an arc shape to reduce the contact area between the drill tooth and the rock formation, and the chamfered cutting edge 103 can increase the impact resistance of the drill tooth. An inwardly concave arc surface 101 is arranged at the center of the end face of the polycrystalline diamond layer 102, and the outer edge of the arc surface 101 is connected to the chip groove 102, thereby increasing the chip holding and chip removal capacity of the drill tooth, reducing the mud packing phenomenon, and extending the service life of the composite sheet. The overall setting of the blade shape on the PDC drill tooth can increase the friction between the drill tooth and the rock formation at the bottom of the hole, achieve the balance of each drill tooth in the entire drilling tool, offset the influence of drilling vibration, and ensure the stability of the drilling platform.

[0034] Embodiment 2, as Figure 4-6 As shown, a multi-curved impact-resistant PDC drill tooth is different from Example 1 in that 6 cutting edges 103 are arranged, which are evenly distributed around the central axis of the polycrystalline diamond layer 1; the chamfered slope surface on the inner side of the cutting edge 103 is a curved surface with a curvature radius of 1 mm; the inclined surface 1031 on the outer side of the arc-shaped cutting edge 103 is at an angle of 55° with the central axis of the polycrystalline diamond layer 1; the curvature radius of the arc surface 101 at the center of the end face of the polycrystalline diamond layer 1 is 15 mm; the curvature radius of the bottom of the arc-shaped chip groove 102 is 1 mm, and other structures are not repeated here.

[0035] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A multi-curved impact-resistant PDC drill tooth, comprising a substrate and a polycrystalline diamond layer arranged at the end of the substrate, characterized in that: A plurality of arc-shaped cutting edges are distributed around the central axis on the end face of the polycrystalline diamond layer, and the intervals between adjacent cutting edges form a chip groove. The center of the end face of the polycrystalline diamond layer is an inwardly concave arc surface, and the outer edge of the arc surface is connected to the chip groove; an inclined surface is provided on the outer side of the cutting edge away from the central axis of the polycrystalline diamond layer, and the inclined surface extends to the outer peripheral surface of the polycrystalline diamond layer.

2. The multi-curved impact-resistant PDC drill bit according to claim 1, characterized in that: The number of the cutting edges is 2-12.

3. The multi-curved impact-resistant PDC drill bit according to claim 2, characterized in that: The cutting edge processes a curved chamfered slope on the inner side of the central axis of the polycrystalline diamond layer.

4. The multi-curved impact-resistant PDC drill bit according to claim 3, characterized in that: The curvature radius of the chamfered slope is 1-3 mm.

5. A multi-curved impact-resistant PDC drill bit according to any one of claims 1 to 4, characterized in that: The angle between the inclined surface and the central axis of the polycrystalline diamond layer is 55-15°.

6. A multi-curved impact-resistant PDC drill bit according to any one of claims 1 to 4, characterized in that: The bottom of the chip removal groove is arranged in an arc shape, and the radius of curvature is 0.5-5mm.

7. A multi-curved impact-resistant PDC drill bit according to any one of claims 1 to 4, characterized in that: The curvature radius of the arc surface is 15-35 mm.

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