Novel tricone bit

Abstract

The utility model relates to the technical field of drill bits, and discloses a novel tricone drill bit which comprises a drill bit body, a connecting threaded seat is fixedly installed on the drill bit body, a plurality of tooth backs are fixedly installed at the lower end of the drill bit body, cones are rotatably installed at the lower ends of the tooth backs, a plurality of alloy teeth are fixedly installed on the outer sides of the cones, and a flow guide groove is formed in the drill bit body. A plurality of flow dividing holes are formed in the connecting threaded seat, the flow guiding groove is communicated with cavities between the flow dividing holes, and a nozzle is movably installed on the lower portion in the flow guiding groove and comprises a nozzle body. Nozzles are arranged at the positions, close to outlets, of the flow dividing holes, each nozzle is composed of a nozzle body, a mounting ring, a displacement shaft, a drill rod and other structures, and displacement of the drill rods can be achieved through cooperation of pressure of cooling media and compression springs. Therefore, stones clamped in the nozzle body can be ejected out or the space where the stones are clamped in the nozzle body is increased so that the stones can automatically fall off, and the self-cleaning function of the nozzle body is achieved.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to a novel tricone drill bit. Background Technology

[0002] In the fields of oil, natural gas and various geological exploration, tricone drill bits have become a key tool widely used in drilling operations due to their excellent rock-breaking performance. Through the coordinated rotation of three cones, they can efficiently break rocks.

[0003] Tricone drill bits are equipped with multiple water jets to cool the drill bit during operation. As a key component of the drill bit cooling and cuttings removal system, these water jets often encounter the problem of rocks getting stuck during actual drilling operations. Once rocks get stuck, they first severely affect the normal spraying of the cooling medium, preventing the drill bit from being adequately cooled during high-speed operation. This leads to a sharp increase in drill bit temperature, accelerating drill bit wear and significantly shortening its service life. Furthermore, when rocks block the water jets, the cooling medium cannot effectively carry rock cuttings out of the hole. Rock cuttings accumulate at the bottom of the well, which not only reduces drilling efficiency but may also cause more serious accidents such as borehole collapse. Utility Model Content

[0004] The purpose of this invention is to provide a novel tricone drill bit that can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A novel tricone drill bit includes a drill bit body, on which a connecting threaded seat is fixedly mounted. Multiple tooth backs are fixedly mounted at the lower end of the drill bit body, and a toothed cone is rotatably mounted at the lower end of each tooth back. Multiple alloy teeth are fixedly mounted on the outer side of the toothed cone. A flow guide groove is formed within the drill bit body, and multiple flow splitting holes are formed within the connecting threaded seat. The flow guide groove and the flow splitting holes are connected by a cavity. A nozzle is movably mounted at the lower part of the flow guide groove. The nozzle includes a nozzle body, and a mounting ring is movably mounted within the nozzle body. A displacement shaft is inserted through the center of the mounting ring, and a fixing block is fixedly mounted at the lower end of the displacement shaft. A chisel is fixedly mounted within the fixing block.

[0007] As a further preferred embodiment of this utility model, the lower end of the nozzle body is provided with multiple operating grooves, the inner side of the nozzle body is provided with a threaded groove, and the nozzle body is threadedly connected to the lower end of the diversion hole. Multiple operating grooves are provided at the bottom of the nozzle body to facilitate the disassembly and assembly of the nozzle body in the diversion hole with the aid of tools.

[0008] As a further preferred embodiment of this utility model, the mounting ring is provided with a plurality of first medium flow channels, and the first medium flow channels are arranged in a ring shape along the transverse contour of the mounting ring. The mounting ring is threadedly connected in the threaded groove. Installing the mounting ring in the nozzle body can provide conditions for the installation and displacement of the displacement shaft, and can ensure that some medium is ejected through the first medium flow channels.

[0009] As a further preferred embodiment of this utility model, a plurality of second medium flow channels are provided on the outer side of the displacement shaft. The bottom of the second medium flow channels is sloping towards the fixed block. The displacement shaft located above the second medium flow channels is also provided with a retaining groove. A retaining spring is installed in the retaining groove. A compression spring is also fitted on the displacement shaft located between the retaining spring and the mounting ring. When the displacement shaft is inserted into the mounting ring, the fixed block can be pushed down by the force of the compression spring, thereby driving the drill rod to push down. Conversely, when the cooling medium supply stops, the displacement shaft can be moved up by the force of the compression spring, thereby driving the drill rod to move up, so as to remove the stone block blocking the nozzle body.

[0010] As a further preferred embodiment of this utility model, a rod groove is provided in the middle of the lower end of the fixing block, and the upper end of the chisel is inserted into the rod groove and fixed by screws.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In this invention, a nozzle is provided near the outlet of the diversion hole, and the nozzle is composed of a nozzle body, a mounting ring, a displacement shaft, a drill rod, and other structures. The pressure of the cooling medium, combined with the compression spring, can be used to move the drill rod, thereby pushing out the stone stuck in the nozzle body or increasing the space in the nozzle body where the stone is stuck so that the stone can fall off automatically, thus realizing the self-cleaning function of the nozzle body. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0014] Figure 2 This is a schematic diagram showing the disassembled main structure of this utility model;

[0015] Figure 3 This is a cross-sectional view of the nozzle of this utility model;

[0016] Figure 4 This is a schematic diagram of the displacement shaft structure of this utility model.

[0017] In the diagram: 1. Drill bit body; 2. Connecting thread seat; 3. Tooth back; 4. Tooth cone; 5. Alloy tooth; 6. Guide groove; 7. Diverter hole; 8. Nozzle; 9. Nozzle body; 10. Mounting ring; 11. Displacement shaft; 12. Fixing block; 13. Drill rod; 14. Operating groove; 15. Threaded groove; 16. First medium flow channel; 17. Second medium flow channel; 18. Rod groove; 19. Snap groove; 20. Snap ring; 21. Compression spring. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] like Figures 1-4 As shown, this utility model provides a novel tri-cone drill bit, including a drill bit body 1, a connecting threaded seat 2 fixedly installed on the drill bit body 1, multiple tooth backs 3 fixedly installed at the lower end of the drill bit body 1, a tooth cone 4 rotatably installed at the lower end of the tooth backs 3, multiple alloy teeth 5 fixedly installed on the outer side of the tooth cone 4, a guide groove 6 is opened in the drill bit body 1, multiple flow-dividing holes 7 are opened in the connecting threaded seat 2, and the cavity between the guide groove 6 and the flow-dividing holes 7 is connected, a nozzle 8 is movably installed at the lower part of the guide groove 6, the nozzle 8 includes a nozzle body 9, an installation ring 10 is movably installed in the nozzle body 9, a displacement shaft 11 is inserted and installed in the middle of the installation ring 10, a fixing block 12 is fixedly installed at the lower end of the displacement shaft 11, and a chisel 13 is fixedly installed in the fixing block 12.

[0020] like Figures 3-4As shown, the nozzle body 9 has multiple operating grooves 14 at its lower end and a threaded groove 15 on its inner side. The nozzle body 9 is threadedly connected to the lower end of the flow divider hole 7. The multiple operating grooves 14 at the bottom of the nozzle body 9 facilitate the disassembly and assembly of the nozzle body 9 within the flow divider hole 7 using tools. The mounting ring 10 has multiple first medium flow channels 16 arranged in a ring shape along the transverse contour of the mounting ring 10. The mounting ring 10 is threadedly connected to the threaded groove 15. Installing the mounting ring 10 within the nozzle body 9 provides conditions for the installation and displacement of the displacement shaft 11 and ensures that some medium is ejected through the first medium flow channels 16. The displacement shaft 11 has multiple second medium flow channels 17 on its outer side. The bottom of the second medium flow channels 17... The part has a slope towards the fixed block 12. The displacement shaft 11 located above the second medium flow channel 17 is also provided with a slot 19. A retaining spring 20 is installed in the slot 19. The displacement shaft 11 located between the retaining spring 20 and the mounting ring 10 is also fitted with a compression spring 21. The displacement shaft 11 is inserted into the mounting ring 10 and the force of the compression spring 21 can push the fixed block 12 down when the cooling medium is sprayed, thereby driving the drill rod 13 down. Conversely, when the cooling medium supply stops, the force of the compression spring 21 can move the displacement shaft 11 up, thereby driving the drill rod 13 up, so as to remove the stone block blocked in the nozzle body 9. The lower middle part of the fixed block 12 is provided with a rod groove 18, and the upper end of the drill rod 13 is inserted into the rod groove 18 and fixed by a screw.

[0021] It should be noted that this utility model is a novel tricone drill bit. After the drill bit body 1 is rotated by the external drill assembly, the drill bit body 1 drives multiple alloy teeth 5 to rotate along the drilling position simultaneously through multiple tooth backs 3. Simultaneously, the cooling medium enters the guide groove 6 through the drill rod and is divided into three diversion holes 7 through the guide groove 6. Then, the cooling medium enters the nozzle body 9 through multiple first medium flow channels 16 through the diversion holes 7 and is ejected. At the same time, some of the cooling medium enters multiple second medium flow channels 17 on the outside of the displacement shaft 11. Thus, the cooling medium entering the second medium flow channels 17 pushes the fixed block 12 down through the delivery pressure, thereby causing the displacement shaft 11 to move down through the fixed block 12. The displacement shaft 11 is also connected by a retaining spring 20. When the compression spring 21 is compressed towards the mounting ring 10, the lower end of the drill rod 13 is located below the nozzle body 9. When a stone gets stuck in the nozzle body 9, it will be located in the space between the drill rod 13 and the screw groove 15. At this time, the insertion of the stone will reduce the amount of cooling medium sprayed out. If the external observation shows that the flow rate of the cooling medium is significantly lower than the normal set value, or the pressure is abnormally high, it is very likely that the water spray hole is blocked, which hinders the smooth flow of the cooling medium. At this time, the supply of cooling medium can be stopped, and the rebound force of the medium compression spring 21 will push the displacement shaft 11 upward, which will cause the displacement shaft 11 to drive the fixing block 12 and the drill rod 13 to move upward. Then, the drill rod 13 will disengage from the stone, which will increase the space inside the nozzle body 9 where the stone is stuck, allowing the stone to fall. Then, the supply of cooling medium can be restarted.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel tricone drill bit, characterized in that: The drill bit body (1) is fixedly mounted with a connecting thread seat (2). Multiple tooth backs (3) are fixedly mounted on the lower end of the drill bit body (1). A toothed wheel (4) is rotatably mounted on the lower end of the tooth backs (3). Multiple alloy teeth (5) are fixedly mounted on the outer side of the toothed wheel (4). A flow guide groove (6) is opened inside the drill bit body (1). Multiple flow splitting holes (7) are opened inside the connecting thread seat (2). The flow guide groove (6) and the flow splitting holes (7) are connected by a cavity. A nozzle (8) is movably mounted at the lower part of the flow guide groove (6). The nozzle (8) includes a nozzle body (9). An installation ring (10) is movably mounted inside the nozzle body (9). A displacement shaft (11) is inserted through the middle of the installation ring (10). A fixing block (12) is fixedly mounted on the lower end of the displacement shaft (11). A chisel (13) is fixedly mounted inside the fixing block (12).

2. The novel tricone drill bit according to claim 1, characterized in that: The nozzle body (9) has multiple operating grooves (14) at its lower end, and a screw groove (15) is provided on the inner side of the nozzle body (9). The nozzle body (9) is threadedly connected to the lower end of the diversion hole (7).

3. A novel tricone drill bit according to claim 2, characterized in that: The mounting ring (10) has a plurality of first medium flow channels (16) inside, and the first medium flow channels (16) are arranged in a ring shape along the transverse contour of the mounting ring (10), and the mounting ring (10) is threadedly connected to the threaded groove (15).

4. A novel tricone drill bit according to claim 3, characterized in that: Multiple second medium flow channels (17) are provided on the outer side of the displacement shaft (11). The bottom of the second medium flow channel (17) is sloping towards the fixed block (12). The displacement shaft (11) located above the second medium flow channel (17) is also provided with a slot (19). A retaining spring (20) is installed in the slot (19). A compression spring (21) is also fitted on the displacement shaft (11) located between the retaining spring (20) and the mounting ring (10).

5. A novel tricone drill bit according to claim 1, characterized in that: The lower middle part of the fixing block (12) has a rod groove (18), and the upper end of the drill rod (13) is inserted into the rod groove (18) and fixed by screws.

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