A hybrid tooth PDC drill bit

Abstract

This utility model discloses a hybrid tooth PDC drill bit, relating to the field of PDC drill bits. It includes a connector for connecting the drill bit and a drive unit; the drill bit has multiple hybrid teeth positioned at different locations on the scraper profile; and the connection between the drill bit and the connector is a detachable structure for quick drill bit replacement. This utility model significantly optimizes the drill bit replacement process through the modular and detachable structure of the connector and the drill bit body. The threaded joint of the connector connects quickly to the drive unit, and the connecting groove and the connecting sleeve of the drill bit body are sealed by a sealing ring. Combined with the stepped limiting structure of the positioning block and positioning groove, and the reinforcing block and reinforcing groove, drill bit disassembly can be completed simply by loosening the bolts. This avoids the cumbersome steps of disassembling the entire equipment in traditional processes, significantly reducing drilling cycles and lowering the labor intensity of tripping operations.

Description

Technical Field

[0001] This utility model belongs to the field of PDC drill bit technology, specifically, it relates to a hybrid tooth PDC drill bit. Background Technology

[0002] In recent years, deep well drilling and ultra-deep well drilling have become the main methods for improving oil and gas resource development in oil and gas exploration and development. In such oil and gas drilling, hard and abrasive formations are often encountered. Therefore, increasing the drilling speed in hard and abrasive formations has become an important way to shorten the drilling cycle and reduce drilling costs. It is known that in drilling hard and abrasive formations, increasing the pressure on the drill bit is usually used to improve drill bit stability and extend its service life, thereby increasing the drilling speed. The types of drill bits available for selection are divided into roller cone bits and fixed cutting tooth bits. In drilling practice, it has been found that when drilling in hard and abrasive formations, roller cone bits often result in low mechanical drilling speed and short lifespan in deep and ultra-deep wells due to the limited bearing life of the roller cone bits and the formation-breaking characteristics of the roller cone cutting teeth. The repeated breaking of drill cuttings at the bottom of the well often leads to the repeated breaking of drill cuttings. The frequent replacement of drill bits results in long tripping and tripping operations, increasing the drilling cycle and labor intensity, and significantly increasing drilling costs.

[0003] Utility model CN204960812U discloses a novel hybrid tooth PDC drill bit, comprising a drill bit body with multiple scrapers distributed on it. The cutting tooth structure of the scrapers includes an inner cone, a nose, an outer cone, a shoulder, and a gauge block. Multiple scrapers are provided with various cutting teeth. Taking the rotation direction of the scrapers during cutting as the forward direction, at least one scraper on the drill bit body has two types of shearing teeth in its front row, and at least one type of shearing tooth or one type of limiting tooth in its rear row. The shearing teeth include two types: circular shearing teeth and ridge-shaped shearing teeth. The limiting teeth include two types: spherical cylindrical teeth and conical cylindrical teeth. By designing a drill bit cutting tooth structure that combines multiple cutting teeth and controls the drill bit's depth of cut, the torque fluctuation of the drill bit can be reduced, the drill bit's anti-abrasion and anti-impact capabilities can be improved, the life of the drill bit's cutting teeth can be extended, and the cutting ability, adaptability, and mechanical drilling speed of the drill bit can be improved, enhancing the drill bit's stability and reducing drilling costs for users.

[0004] However, existing PDC drill bits do not explicitly disclose the detachable structural design of the connectors and the drill bit body, only emphasizing the mixed arrangement of various cutting teeth. During drilling operations, when the drill bit wears out and needs replacement, operators must completely disassemble the connecting parts with the drive equipment, sometimes requiring special tools, making the replacement process cumbersome and time-consuming. This design cannot meet the needs of frequent drill bit changes in deep well drilling, especially in hard formations where drill bit wear is rapid. A non-detachable structure significantly prolongs tripping and tripping operations, increasing drilling costs. Therefore, this utility model is proposed. Utility Model Content

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0006] A hybrid tooth PDC drill bit, comprising:

[0007] A connector for connecting a drill bit and a drive device;

[0008] The drill bit is provided with multiple mixed teeth for different positions of the scraper profile. The connection between the drill bit and the connector is designed to be detachable for quick replacement of the drill bit.

[0009] Preferably, the connector includes a connecting block, one end of which is fixed with a threaded connector for connecting a drive device, the connecting block has a water guide groove inside, and the other end of the connecting block has a connecting groove in the middle, the connecting groove is connected to the water guide groove, and a sealing ring is embedded at the bottom of the connecting groove.

[0010] Preferably, the other end of the connecting block is provided with a plurality of positioning grooves arranged in a ring array, and a plurality of reinforcing grooves are provided on one side wall of the positioning grooves. The other end edge of the connecting block is provided with two symmetrically distributed mating grooves, and the inner wall of the mating groove is provided with an installation hole.

[0011] Preferably, the drill bit includes a drill bit body, one end of which is provided with a plurality of scrapers arranged in a ring array, and a plurality of nozzles arranged at equal intervals are provided in the grooves between the plurality of scrapers. The nozzles are connected to the water guiding channel inside the drill bit body. The ends of the scrapers are provided with a plurality of ridge-shaped shearing teeth arranged at equal intervals, and the sides of the scrapers are provided with a plurality of rear row teeth arranged at equal intervals.

[0012] Preferably, a connecting sleeve is provided at the middle of the other end of the drill bit body. The connecting sleeve is located at the inlet of the water guide channel. The connecting sleeve is adapted to the connecting groove and fits against the sealing ring. A plurality of positioning blocks arranged in a circular array are fixed at the other end of the drill bit body. The positioning blocks are adapted to the positioning groove and are used to improve the connection strength between the connector and the drill bit. A plurality of equally spaced reinforcing blocks are fixed on one side of the positioning blocks. The reinforcing blocks are adapted to the reinforcing groove and are used to further improve the connection strength between the connector and the drill bit.

[0013] Preferably, two symmetrically distributed extension plates are fixed to the other end edge of the drill bit body. A placement groove is provided in the middle of the outer side of the extension plate, and a bolt is connected through the placement groove. The bolt is adapted to the mounting hole and is used to limit and fix the drill bit and the connector.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] This invention significantly optimizes the drill bit replacement process through a modular and detachable structure of the connector and the drill bit body. The threaded joint of the connector can be quickly connected to the drive device, and the connecting groove and the connecting sleeve of the drill bit body are sealed by a sealing ring. With the stepped limiting structure of the positioning block and positioning groove, and the reinforcing block and reinforcing groove, the drill bit can be disassembled simply by loosening the bolts. This avoids the cumbersome steps of disassembling the entire equipment in the traditional process, significantly reduces the drilling cycle, and reduces the labor intensity of tripping in and out of the drill bit.

[0016] The ridge-shaped shearing teeth and the rear row of teeth on the main body of this utility model form a composite cutting structure. The wedge-shaped design of the ridge-shaped shearing teeth enhances the shearing and crushing ability of hard rock formations, while the arc surface of the rear row of teeth reduces wear from abrasive formations. The two are distributed differently according to the inner and outer cone regions of the scraper profile, so that the drill bit can maintain efficient cutting in different formations such as sandstone and shale. At the same time, the water guide groove is connected to the water guide channel inside the drill bit. After the drilling fluid is sprayed out under high pressure through the nozzle, it can simultaneously cool the cutting teeth and flush away rock cuttings at the bottom of the well, preventing excessive wear of the cutting teeth caused by rock cuttings accumulation.

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a bottom view of the overall structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the connector structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the drill bit structure of this utility model.

[0023] Figure 5 This is a bottom view of the drill bit structure of this utility model.

[0024] In the diagram: Connector 1, Connecting Block 11, Threaded Joint 12, Water Guide Channel 13, Connecting Groove 14, Sealing Ring 15, Positioning Groove 16, Reinforcing Groove 17, Mating Groove 18, Mounting Hole 19, Drill Bit 2, Drill Bit Body 21, Nozzle 22, Scraper 23, Ridge Shearing Tooth 24, Rear Tooth 25, Connecting Sleeve 26, Positioning Block 27, Reinforcing Block 28, Extension Plate 29, Placement Groove 210, Bolt 211. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0026] like Figures 1 to 5 As shown, a hybrid tooth PDC drill bit includes a connector 1 and a drill bit 2. The connector 1 is used to connect the drill bit 2 and the drive device. The drill bit 2 is provided with multiple hybrid teeth for different positions of the scraper 23 profile. The connection between the drill bit 2 and the connector 1 is set as a detachable structure for quick replacement of the drill bit 2.

[0027] Specifically, the connector 1 includes a connecting block 11. One end of the connecting block 11 is fixed with a threaded connector 12 for connecting the drive device. A water guide groove 13 is provided inside the connecting block 11. A connecting groove 14 is provided in the middle of the other end of the connecting block 11. The connecting groove 14 is connected to the water guide groove 13. A sealing ring 15 is embedded in the bottom of the connecting groove 14. A plurality of positioning grooves 16 are provided in a ring array at the other end of the connecting block 11. A plurality of equally spaced reinforcing grooves 17 are provided on one side wall of the positioning groove 16. Two symmetrically distributed mating grooves 18 are provided on the edge of the other end of the connecting block 11. An installation hole 19 is provided in the middle of the inner wall of the mating groove 18.

[0028] More specifically, the drill bit 2 includes a drill bit body 21. One end of the drill bit body 21 is provided with multiple scrapers 23 arranged in a circular array. Multiple nozzles 22 are arranged at equal intervals within the slots between the scrapers 23. The nozzles 22 are connected to the water guiding channel inside the drill bit body 21. The ends of the scrapers 23 are provided with multiple equally spaced ridge-shaped shearing teeth 24. The ridge-shaped shearing teeth 24 have a wedge-shaped structure to enhance impact resistance. The sides of the scrapers 23 are provided with multiple equally spaced rear row teeth 25. The arc-shaped design of the rear row teeth 25 reduces abrasive formation wear. The combination of these features allows the drill bit 2 to maintain efficient cutting in sandstone, shale, and other formations. A connecting sleeve 26 is provided at the middle of the other end of the drill bit body 21. The connecting sleeve 26 is located at the inlet of the water guiding channel. The connecting sleeve 26 is adapted to the connecting groove 14, and the connecting sleeve 26 is connected to the sealing ring 15. The drill bit body 21 has multiple positioning blocks 27 arranged in a ring array fixed at one end. The positioning blocks 27 are adapted to the positioning groove 16 to improve the connection strength between the connector 1 and the drill bit 2. Multiple reinforcing blocks 28 are fixed on one side of the positioning blocks 27. The reinforcing blocks 28 are adapted to the reinforcing groove 17 to further improve the connection strength between the connector 1 and the drill bit 2. The stepped fit between the positioning blocks 27 and the reinforcing blocks 28, combined with the pre-tightening of the bolts 211, improves the tensile strength of the connection and adapts to the high torque conditions of deep well drilling. Two symmetrically distributed extension plates 29 are fixed on the edge of the other end of the drill bit body 21. A placement groove 210 is opened in the middle of the outer side of the extension plate 29. A bolt 211 is connected through the placement groove 210. The bolt 211 is adapted to the mounting hole 19 to limit and fix the drill bit 2 and the connector 1.

[0029] The threaded connector 12 of the connector 1 is connected to the drive device, driving the drill bit 2 to rotate. The water guide groove 13 passes through the connecting block 11 and communicates with the water guide channel of the drill bit body 21. The drilling fluid enters the water guide channel through the water guide groove 13 and the connecting groove 14, and is ejected at high pressure from the nozzle 22 to cool the ridge-shaped shearing teeth 24 at the end of the scraper 23, while simultaneously flushing away rock cuttings at the bottom of the well to prevent accumulation. The sealing ring 15 is embedded in the bottom of the connecting groove 14 and fits tightly with the connecting sleeve 26 of the drill bit 2 to prevent drilling fluid leakage. The ridge-shaped shearing teeth 24 at the end of the scraper 23 have a wedge-shaped structure, which generates shearing and breaking force on the formation when the drill bit 2 rotates, making it suitable for hard rock formations; the rear row of teeth 25 on the side of the scraper 23 assists in breaking rock blocks and reduces the wear of the main cutting teeth. The multiple mixed teeth are distributed according to the contour of the scraper 23: the tooth density in the inner cone area is higher to enhance the breaking force, and the tooth spacing in the outer cone area is increased to improve the cuttings removal efficiency.

[0030] The positioning block 27 is embedded in the positioning groove 16 of the connector 1, and the reinforcing block 28 is inserted into the reinforcing groove 17 to form a three-dimensional limit. The bolt 211 passes through the placement groove 210 of the extension plate 29 and locks with the mounting hole 19 to ensure a rigid connection between the drill bit 2 and the connector 1 and prevent loosening during high-speed rotation. During disassembly, simply loosen the bolt 211 to pull the connecting sleeve 26 of the drill bit body 21 out of the connecting groove 14, which is suitable for the needs of quick drill change at the drilling site.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hybrid tooth PDC bit, characterized by, include: A connector for connecting a drill bit and a drive device; The connector includes a connecting block, one end of which is fixed with a threaded connector for connecting a drive device. A water guide groove is provided inside the connecting block, and a connecting groove is provided in the middle of the other end of the connecting block. The connecting groove is connected to the water guide groove, and a sealing ring is embedded at the bottom of the connecting groove. The other end of the connecting block is provided with a plurality of positioning grooves arranged in a ring array. A plurality of reinforcing grooves are provided on one side wall of the positioning grooves. Two symmetrically distributed mating grooves are provided on the edge of the other end of the connecting block. An installation hole is provided in the middle of the inner wall of the mating groove. The drill bit is provided with multiple mixed teeth for different positions of the scraper profile. The connection between the drill bit and the connector is designed to be detachable for quick replacement of the drill bit.

2. The hybrid tooth PDC drill bit of claim 1, wherein, The drill bit includes a drill bit body. One end of the drill bit body is provided with a plurality of scrapers arranged in a ring array. A plurality of nozzles are arranged at equal intervals in the grooves between the plurality of scrapers. The nozzles are connected to the water guiding channel inside the drill bit body. The ends of the scrapers are provided with a plurality of ridge-shaped shearing teeth arranged at equal intervals. The sides of the scrapers are provided with a plurality of rear row teeth arranged at equal intervals.

3. The hybrid tooth PDC drill bit of claim 2, wherein, A connecting sleeve is provided at the middle of the other end of the drill bit body. The connecting sleeve is located at the inlet of the water guide channel. The connecting sleeve is adapted to the connecting groove and fits against the sealing ring. A plurality of positioning blocks arranged in a circular array are fixed at the other end of the drill bit body. The positioning blocks are adapted to the positioning groove and are used to improve the connection strength between the connector and the drill bit. A plurality of reinforcing blocks are fixed on one side of the positioning blocks. The reinforcing blocks are adapted to the reinforcing groove and are used to further improve the connection strength between the connector and the drill bit.

4. The hybrid tooth PDC drill bit of claim 3, wherein, Two symmetrically distributed extension plates are fixed to the other end edge of the drill bit body. A placement groove is provided in the middle of the outer side of the extension plate. A bolt is connected through the placement groove. The bolt is adapted to the mounting hole and is used to limit and fix the drill bit and the connector.

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