Coreless anti-deviation drill bit with PDC (Polycrystalline Diamond Compact)

Abstract

The utility model discloses a PDC (polycrystalline diamond compact) coreless anti-deviation drill bit, which belongs to the technical field of coreless drill bits and particularly comprises a drill bit connecting seat, the lower end of the drill bit connecting seat is detachably connected onto drilling equipment, and a central cutting tooth is fixedly connected to the middle of the top end of the drill bit connecting seat. A plurality of blades which are circumferentially distributed are arranged on the outer side of the central cutting tooth, and a plurality of outer cutting teeth which are distributed in a stepped manner are fixedly connected to the blades; compared with the prior art, the drill bit has the advantages that in the drilling operation of the outer cutting teeth distributed in a stepped mode, a stepped rock cutting face formed by the outer cutting teeth and rock can serve as a centering guide of the drill bit, so that the stability of the drilling direction is kept, and inclined hole accidents can be effectively avoided; and (2) during drilling, the outer cutting teeth distributed in a stepped manner can cut rocks in a layered manner, so that the drilling footage speed of the drill bit during drilling is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of coreless drills, and particularly relates to a PDC composite sheet coreless anti-deviation drill bit. Background Art

[0002] A diamond composite sheet drill bit refers to a drill bit with diamond composite sheets as cutting edges, belonging to an integral drill bit. Its advantages are high strength, high wear resistance and impact resistance. When the diamond composite sheet drill bit drills in soft to medium-hard formations, it has the advantages of high speed, large footage, long service life, stable operation, few downhole accidents, good wellbore quality, etc., and has the advantages of low cost and wide application range compared with diamond drill bits.

[0003] The Chinese utility model patent with the application number 202222692089.5 is disclosed in the prior art. This patent discloses a four-wing misaligned diamond composite sheet concave drill bit, including: a drill bit body; a rock-breaking column welded to the middle of the top surface of the drill bit body. Its characteristics are: two first drill bit wings are symmetrically arranged on the circumferential outer wall of the top end of the drill bit body, and two first diamond composite sheet cutting teeth are welded to the top ends of the cutting surfaces of the first drill bit wings. Two symmetrically arranged second drill bit wings are arranged between the two first drill bit wings, and one second diamond composite sheet cutting tooth is welded to the top end of the cutting surface of each second drill bit wing. The structure of the four-wing misaligned diamond composite sheet concave drill bit of the utility model is reasonably designed. Multiple groups of drill bit wings are arranged on the outer wall of the top end of the drill bit body, reducing the volume of the drill bit wings and at the same time reducing the number of cutting teeth, increasing the powder discharge space of the drill bit, increasing the powder discharge efficiency during drilling, and improving the drilling speed and working efficiency of the drill bit.

[0004] However, there are still deficiencies in the above prior art: two first diamond composite sheet cutting teeth are welded side by side to the top end of the cutting surface of the first drill bit wing. By adopting the side-by-side arrangement of the first diamond composite sheets, when drilling holes in rocks, the phenomenon of unstable drilling direction will occur, resulting in the occurrence of inclined hole accidents. Summary of the Utility Model

[0005] To solve the problems raised in the above background art, the utility model provides a PDC composite sheet coreless anti-deviation drill bit, which has the characteristics of easy slag discharge, uniform distribution of drill pressure on the drill bit, and avoidance of drilling deviation.

[0006] To achieve the above object, the present utility model provides the following technical solution: A coreless anti-deviation bit for PDC composite sheets, comprising a bit connection seat, the lower end of the bit connection seat is detachably connected to a drilling device, the middle of the top end of the bit connection seat is fixedly connected with a central cutting tooth, and several circumferentially distributed cutter wings are arranged outside the central cutting tooth, and several stepped outer cutting teeth are fixedly connected to the cutter wings.

[0007] Preferably, a connection hole is provided at the other bottom end of the bit connection seat, and internal threads are provided on the inner wall of the connection hole.

[0008] Preferably, a chip removal channel is formed between two adjacent cutter wings.

[0009] Preferably, a first cooling hole communicating with the connection hole is provided on the chip removal channel.

[0010] Preferably, a second cooling hole communicating with the connection hole is provided in the middle of the bit connection seat.

[0011] Preferably, several stepped mounting grooves are axially arranged on the outer side of the cutter wing, and gauge protection teeth are fixedly connected in the mounting grooves.

[0012] Preferably, the horizontal height of the innermost outer cutting tooth on the cutter wing is lower than the horizontal height of the outermost outer cutting tooth on the cutter wing.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] The present utility model has the following benefits compared with the prior art: (1) In the drilling operation, the stepped outer cutting teeth form a stepped rock cutting surface with the rock, which can be used as the centering guide of the bit, thereby maintaining the stability of the drilling direction and effectively avoiding the occurrence of inclined hole accidents; (2) When drilling, the stepped outer cutting teeth can cut the rock in layers, improving the penetration rate of the bit during drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0017] Figure 2 is a front view structural schematic diagram of the present utility model;

[0018] Figure 3 is a top view structural schematic diagram of the present utility model;

[0019] Figure 4 This is a schematic view of the upward structure of the utility model.

[0020] In the figure: 1, drill bit connection seat; 2, central cutting tooth; 3, blade; 4, external cutting tooth; 5, connection hole; 6, internal thread; 7, first cooling hole; 8, second cooling hole; 9, installation groove; 10, gauge protection tooth. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment

[0022] Please refer to Figures 1-4 , this embodiment provides the following technical solutions: A PDC composite coreless anti-deviation drill bit, including a drill bit connection seat 1, the lower end of the drill bit connection seat 1 is detachably connected to the drilling equipment, and a connection hole 5 is provided at the other lower end of the drill bit connection seat 1. An internal thread 6 is provided on the inner wall of the connection hole 5. By providing the drill bit connection seat 1, the drill bit can be detachably connected to the drilling equipment, and during the working state of the drilling equipment, the drill bit can perform reaming operations on specific positions.

[0023] The middle part of the top end of the drill bit connection seat 1 is fixedly connected with a central cutting tooth 2. In some embodiments, there are two central cutting teeth 2, and the two central cutting teeth 2 are circumferentially distributed at the top end of the drill bit connection seat 1. By providing the central cutting tooth 2, it can help the drill bit maintain the direction stability during the drilling process and improve the drilling efficiency of the drill bit.

[0024] A number of circumferentially distributed blades 3 are provided outside the central cutting tooth 2, and a number of externally cutting teeth 4 distributed in a stepped manner are fixedly connected to the blades 3. In the drilling operation, the stepped rock cutting surface formed by the externally cutting teeth 4 and the rock can be used as the centering guide of the drill bit, thereby maintaining the stability of the drilling direction and effectively avoiding the occurrence of inclined hole accidents; and the externally cutting teeth 4 distributed in a stepped shape can also perform layered cutting on the rock during drilling, improving the footage speed of the drill bit during drilling.

[0025] The horizontal height of the innermost externally cutting tooth 4 on the blade 3 is lower than the horizontal height of the outermost externally cutting tooth 4 on the blade 3, which further helps to make the drill pressure distribution uniform, improves the drilling effect, and further avoids the problem of deviation when the drill bit reams.

[0026] A chip removal channel is formed between two adjacent cutter wings 3. Through the set chip removal channel, it is possible to facilitate the discharge of slag and chips during the drilling process of the central cutting teeth 2 and the outer cutting teeth 4, which is beneficial to improving the drilling efficiency of the drill bit and avoiding repeated cutting of the drill bit, thereby reducing the wear of the drill bit.

[0027] A first cooling hole 7 communicating with the connection hole 5 is provided on the chip removal channel, and a second cooling hole 8 communicating with the connection hole 5 is provided in the middle of the drill bit connection seat 1. Through the set first cooling hole 7 and second cooling hole 8, during the drilling process of the central cutting teeth 2 and the outer cutting teeth 4, the coolant can cool the central cutting teeth 2 and the outer cutting teeth 4. It can not only remove the slag and chips on the drill bit to avoid the influence of slag and chip accumulation on the cutting efficiency of the drill bit, but also wash the slag and chips attached to the central cutting teeth 2 and the outer cutting teeth 4.

[0028] A number of axially arranged and stepwise distributed mounting grooves 9 are provided on the outer side of the cutter wing 3, and a gauge protection tooth 10 is fixedly connected in the mounting groove 9. The gauge protection tooth 10 provided on the side of the cutter wing 3 mainly plays a role in scraping and trimming the drilled hole, preventing the drilled hole from expanding or shrinking due to the vibration of the drill bit or the extrusion of the formation during the drilling process, thereby maintaining the predetermined diameter of the drilled hole. And the gauge protection tooth 10 can reduce the excessive contact between the drill bit and the hole wall, thereby reducing wear and extending the service life of the drill bit.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A coreless anti-deviation PDC composite bit, characterized in that: It includes a drill bit connecting seat (1), the lower end of the drill bit connecting seat (1) is detachably connected to a drilling device, the middle part of the top end of the drill bit connecting seat (1) is fixedly connected with a center cutting tooth (2), several cutter wings (3) are circumferentially distributed outside the center cutting tooth (2), and several outer cutting teeth (4) distributed in a stepped manner are fixedly connected to the cutter wings (3).

2. The non-core anti-deviation bit for PDC composite bits according to claim 1, characterized in that: A connecting hole (5) is arranged at the other bottom end of the drill bit connecting seat (1), and an internal thread (6) is arranged on the inner wall of the connecting hole (5).

3. A coreless anti-deviation PDC composite bit according to claim 1, characterized in that: A chip removal channel is formed between two adjacent cutter wings (3).

4. A coreless anti-deviation PDC composite bit according to claim 3, characterized in that: A first cooling hole (7) communicated with the connecting hole (5) is arranged on the chip removal channel.

5. The non-core anti-deviation bit for PDC composite inserts according to claim 2, characterized in that: A second cooling hole (8) communicated with the connecting hole (5) is arranged in the middle part of the drill bit connecting seat (1).

6. A coreless anti-deviation PDC composite bit according to claim 1, characterized in that: A plurality of axially arranged stepped mounting grooves (9) are arranged on the outer side of the cutter wing (3), and a gauge protection tooth (10) is fixedly connected in the mounting groove (9).

7. A coreless anti-deviation PDC composite bit according to claim 6, characterized in that: The horizontal height of the innermost outer cutting tooth (4) on the cutter wing (3) is lower than the horizontal height of the outermost outer cutting tooth (4) on the cutter wing (3).

Images