Durable drill bits for oil exploration drilling

Abstract

The present application relates to the technical field of petroleum drilling downhole tools, and discloses a durable drill bit for petroleum exploration drilling, which comprises a drill bit main body, a bit holder, a roller, a dismounting assembly and a lower joint. The present application has reasonable and compact structure, and is convenient to use. When the bit holder needs to be dismounted, the dismounting screw rod is rotated, the pressing block is moved downward, the front and rear elastic reset members make the front and rear limiting blocks approach each other, the front limiting block is moved backward to make the front end of the front fixed rod move out of the front fixed hole, the rear limiting block is moved forward to make the rear end of the rear fixed rod move out of the rear fixed hole, so that the mounting frame and the drill bit main body are separated from each other, the dismounting work of the bit holder and the drill bit main body is completed, the lower joint which can be radially contracted is arranged at the lower part of the drill bit main body, the quick separation and assembly between the lower joint and the pipe string are facilitated, the dismounting difficulty between the drill bit and the pipe string is reduced, the wear resistance of the drill bit is improved, the roller can be conveniently replaced and maintained, the number of drilling times can be reduced, and the cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of downhole tools technology for oil drilling, and is a durable drill bit for oil exploration drilling. Background Technology

[0002] Petroleum exploration refers to the process of finding and identifying oil and gas resources by using various exploration methods to understand the underground geological conditions. Drilling is often required during exploration, and drill bits are indispensable tools in this process. Current drilling technologies mainly use roller cone bits and PDC bits. Roller cone bits are characterized by low cost when drilling in soft and highly abrasive formations, while PDC bits are characterized by high rock-breaking efficiency in hard plastic formations. Both roller cone and PDC bits have their advantages. In recent years, researchers have conducted extensive research on PDC bits, but there has been less exploration of roller cone bits, which have a wider range of applications and lower drilling costs.

[0003] Replaceable roller cone bits are an effective means to improve the lifespan of roller cone bits, drilling efficiency, and reduce drilling costs. Research has shown that while roller cone bits can perform basic rock-breaking functions, the cones themselves are prone to wear after prolonged operation, affecting drilling performance. Furthermore, because the roller cone and drill bit are usually designed as a single unit, damaged parts cannot be replaced individually, increasing the number of drilling trips, the cost of the drill bit itself, and the drilling cycle, causing inconvenience to operators. To address the limitations of traditional one-piece roller cone bits, such as short lifespan and lack of replaceability and maintenance, a durable drill bit for oil exploration drilling has been proposed, making the replacement and maintenance of roller cone bits much more convenient.

[0004] While existing roller cone drill bits can achieve the purpose of oil exploration drilling, the inability to replace the roller cones leads to high costs and low durability. The main reasons are as follows: 1. Roller cone drill bits are prone to wear and failure when performing long-term rock breaking operations, increasing the number of drilling passes. 2. Due to the integrated design of the roller cone and drill bit, existing roller cone drill bits cannot replace the damaged parts of the roller cone separately; 3. Existing roller cone drill bits cannot be repaired and reused after wear and failure, resulting in high costs.

[0005] Given the above situation, it is of great significance to provide durable drill bits for oil exploration drilling. Summary of the Invention

[0006] This invention provides a durable drill bit for oil exploration drilling, which overcomes the shortcomings of the prior art and effectively solves the problems of rapid wear, high number of drilling trips, inability to replace and repair the roller cone due to the one-piece design, and high cost of existing roller cone drill bits.

[0007] The technical solution of this invention is achieved through the following measures: A durable drill bit for oil exploration drilling includes a drill bit body, toothed plates, roller cones, a disassembly and assembly assembly, and a lower connector. A plurality of toothed plates are evenly distributed around the outer side of the drill bit body at circumferential intervals. Each toothed plate has a roller cone on its upper part. A disassembly and assembly groove with an outward opening is provided on the lower outer side of the drill bit body corresponding to each toothed plate position. A disassembly and assembly assembly that can be detachably installed in the disassembly and assembly groove is fixedly installed on the lower part of the toothed plate. The disassembly and assembly assembly located on the leftmost side includes a mounting frame, a front limiting block, a rear limiting block, and... The system includes a front fixed rod, a rear fixed rod, a front elastic reset component, a rear elastic reset component, a pressure block, a limiting plate, and a disassembly / removal screw. A mounting frame is fitted into a disassembly / removal slot. A front limiting block and a rear limiting block are spaced apart within the mounting frame. A guide rod, with its front portion penetrating the upper part of the front limiting block and its rear portion penetrating the upper part of the rear limiting block, is fixedly mounted on the upper part of the mounting frame. A front elastic reset component, fitted onto the outer side of the front portion of the guide rod, is located on the front side of the front limiting block and the inner front side of the mounting frame. A component, fitted onto the outer side of the rear portion of the guide rod, is located on the rear side of the rear limiting block and the inner rear side of the mounting frame. The rear elastic reset component has at least two front fixing rods fixedly installed at intervals on the front side of the front limiting block at the position below the guide rod. The front end of each front fixing rod passes through the front side of the mounting frame, and the inner wall of the disassembly groove at the position of each front fixing rod is provided with a front fixing hole. Similarly, at least two rear fixing rods are fixedly installed at intervals on the rear side of the rear limiting block at the position below the guide rod. The rear end of each rear fixing rod passes through the rear side of the mounting frame, and the inner wall of the disassembly groove at the position of each rear fixing rod is provided with a rear fixing hole. The lower end of the front limiting block... The side has an arc-shaped front slide groove with an opening facing backward. The lower front side of the rear limit block has a rear slide groove that is symmetrically arranged with the front slide groove. Between the lower part of the front slide groove and the lower part of the rear slide groove, there is a tapered pressure block that is smaller at the top and larger at the bottom. A sliding groove is provided on the right side of the tooth palm corresponding to the middle position of the mounting frame. A limit plate that is fixed together with the lower side of the pressure block is slidably installed in the sliding groove. A disassembly and assembly screw that allows the limit plate to move up and down in the sliding groove is screwed to the lower side of the tooth palm. A radially retractable lower connector is installed at the lower part of the drill bit body. There are connecting threads on the outside of the lower connector.

[0008] The following are further optimizations and / or improvements to the above-mentioned technical solution: The aforementioned lower connector may include several fan-shaped annular connector blocks that form a tubular structure when approached radially, and an adjustment assembly for radially moving the connector blocks. The adjustment assembly includes a connecting rod, a sliding plate, a compression spring, a support plate, and an adjustment rod. A limiting groove is provided at the center of the lower end of the drill bit body. Adjustment grooves corresponding to the connector blocks and arranged radially are evenly distributed along the circumference of the inner wall of the lower end of the limiting groove. A connecting rod is provided in each adjustment groove. A sliding plate matching the adjustment groove is fixedly installed on the outer side of the middle part of the connecting rod. A compression spring fitted on the outer side of the connecting rod is provided between the side of each sliding plate away from the inner wall of the limiting groove and the inner wall of the adjustment groove. The lower side of each sliding plate is fixedly installed together with the upper side of the corresponding connector block. A support plate with its outer side abutting against the end of the connecting rod is fitted in the limiting groove. A vertically penetrating mounting hole is provided at the center of the upper end of the drill bit body. An adjustment rod that allows the support plate to move up and down in the limiting groove when rotated is provided in the mounting hole.

[0009] The aforementioned adjusting rod can be tubular in shape. A connector is sealed and fixedly installed at the upper end of the adjusting rod corresponding to the upper end of the drill bit body. A limiting ring platform with its upper end in contact with the upper inner wall of the limiting groove is fixed on the lower outer side of the adjusting rod. An adjusting screw hole is provided in the center of the support plate, and the lower outer side of the adjusting rod is screwed into the adjusting screw hole. Two limiting holes are distributed at intervals on the upper inner wall of the limiting groove. A limiting pin with its lower end fixedly installed together with the upper end of the support plate is fitted in each limiting hole.

[0010] The upper inner wall of the above-mentioned mounting hole may be provided with a connecting ring groove. A number of water inlet holes with internal and external connections are evenly distributed along the circumference on the outer side of the adjusting rod corresponding to the position of the connecting ring groove. A water outlet groove is provided on the upper end of the drill bit body corresponding to the position between each two adjacent teeth. A flow channel with the other end connected to the inner wall of the connecting ring groove is provided on the bottom wall of each water outlet groove.

[0011] Each of the above-mentioned water outlet tanks can be fixedly installed with a nozzle.

[0012] The distance between the central axis of the connecting rod and the upper end of the joint block may not be greater than the thickness of the support plate.

[0013] The lower side of the tooth at the corresponding sliding groove position can be provided with a downward-opening mounting groove. The upper inner wall of the mounting groove is provided with a disassembly and assembly screw hole that communicates with the lower part of the sliding groove. The disassembly and assembly screw is screwed into the disassembly and assembly screw hole, and the upper end of the disassembly and assembly screw is rotatably connected to the lower part of the limiting plate.

[0014] The drill bit body has three teeth evenly distributed around its circumference on the outer side, with each pair of adjacent teeth meshing with each other.

[0015] This invention has a reasonable and compact structure and is easy to use. When the drill bit needs to be disassembled, the disassembly screw is rotated, the pressure block moves downward, and the front and rear elastic reset parts bring the front and rear limit blocks closer to each other. The front limit block moves backward, causing the front end of the front fixing rod to move out of the front fixing hole, and the rear limit block moves forward, causing the rear end of the rear fixing rod to move out of the rear fixing hole. This allows the mounting frame and the drill bit body to separate from each other, completing the disassembly of the drill bit and the drill bit body. The lower part of the drill bit body is equipped with a radially retractable lower connector, which facilitates the quick separation and assembly of the lower connector and the tubing, reduces the difficulty of disassembling and assembling the drill bit and the tubing, improves the wear resistance of the drill bit, facilitates the replacement and maintenance of the drill bit cone, and can achieve the purpose of reducing the number of drilling trips and reducing costs. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the front cross-sectional structure of the present invention.

[0017] Appendix Figure 2 This is a top-view partial cross-sectional structural diagram of the disassembly and assembly components in this invention.

[0018] Appendix Figure 3 This is a partial cross-sectional view of the right side of the disassembly and assembly components in this invention.

[0019] The codes in the attached diagram are as follows: 1 is the drill bit body, 2 is the toothed part, 3 is the toothed wheel, 4 is the mounting frame, 5 is the front limit block, 6 is the rear limit block, 7 is the front fixing rod, 8 is the rear fixing rod, 9 is the front elastic reset component, 10 is the rear elastic reset component, 11 is the pressure block, 12 is the limit plate, 13 is the disassembly screw, 14 is the connector block, 15 is the connecting rod, 16 is the sliding plate, 17 is the compression spring, 18 is the support plate, 19 is the adjusting rod, 20 is the limit groove, 21 is the connecting component, 22 is the limit pin, 23 is the connecting ring groove, 24 is the water inlet, 25 is the flow channel, 26 is the nozzle, 27 is the mounting groove, 28 is the guide rod, and 29 is the limit ring platform. Detailed Implementation

[0020] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0021] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0022] The present invention will be further described below with reference to embodiments and accompanying drawings: As attached Figure 1 , 2As shown in Figure 3, the durable drill bit for oil exploration drilling includes a drill bit body 1, toothed plates 2, roller cones 3, disassembly and assembly components, and a lower connector. Several toothed plates 2 are evenly distributed around the outer circumference of the drill bit body 1. Each toothed plate 2 has a roller cone 3 on its upper part. A disassembly and assembly groove with an outward opening is provided on the lower outer side of the drill bit body 1 corresponding to each toothed plate 2. A disassembly and assembly component that can be detachably installed in the disassembly and assembly groove is fixedly installed on the lower part of each toothed plate 2. The disassembly and assembly component located on the far left includes a mounting frame 4, a front limiting block 5, a rear limiting block 6, a front fixing rod 7, a rear fixing rod 8, and a front elastic reset component 9. The mounting frame 4 is fitted into the disassembly slot, consisting of a rear elastic reset component 10, a pressure block 11, a limiting plate 12, and a disassembly screw 13. A front limiting block 5 and a rear limiting block 6 are spaced apart within the mounting frame 4. A guide rod 28, with its front portion penetrating the upper part of the front limiting block 5, is fixedly installed on the upper part of the mounting frame 4. The rear portion of the guide rod 28 penetrates the upper part of the rear limiting block 6. A front elastic reset component 9, fitted onto the outer side of the front portion of the guide rod 28, is located on the front side of the front limiting block 5 and the inner front side of the mounting frame 4. A rear elastic reset component 9, fitted onto the outer side of the rear portion of the guide rod 28, is located on the rear side of the rear limiting block 6 and the inner rear side of the mounting frame 4. The reset component 10 has at least two front fixing rods 7 fixedly installed at intervals on the front side of the front limiting block 5, which is located below the guide rod 28. The front end of each front fixing rod 7 passes through the front side of the mounting frame 4. The inner wall of the disassembly groove corresponding to each front fixing rod 7 is provided with a front fixing hole. At least two rear fixing rods 8 are fixedly installed at intervals on the rear side of the rear limiting block 6, which is located below the guide rod 28. The rear end of each rear fixing rod 8 passes through the rear side of the mounting frame 4. The inner wall of the disassembly groove corresponding to each rear fixing rod 8 is provided with a rear fixing hole. The rear side of the lower end of the front limiting block 5 The drill bit has an arc-shaped front slide groove with an opening facing backward. The lower front side of the rear limit block 6 has a rear slide groove that is symmetrically arranged with the front slide groove. Between the lower part of the front slide groove and the lower part of the rear slide groove, there is a tapered pressure block 11 that is smaller at the top and larger at the bottom. A sliding groove is provided on the right side of the toothed plate 2 corresponding to the middle position of the mounting frame 4. A limit plate 12 with its upper right side fixed to the lower side of the pressure block 11 is slidably installed in the sliding groove. A disassembly and assembly screw 13 is screwed to the lower side of the toothed plate 2, which allows the limit plate 12 to move up and down in the sliding groove. A radially retractable lower connector is installed at the lower part of the drill bit body 1. The lower connector has connecting threads on its outer side.

[0023] According to the requirements, the drill body 1 is a columnar structure. The front elastic reset member 9 and the rear elastic reset member 10 are both existing and known compression springs 17. The front slide and the rear slide can also be tapered grooves that gradually increase in size from top to bottom. The mounting frame 4 is rectangular and is fixed together with the toothed plate 2. There are two front fixing rods 7 and two rear fixing rods 8. The toothed wheel 3 is existing and known technology, and each toothed wheel 3 has cutting teeth. During use, when it is necessary to disassemble the toothed plate 2, rotate the disassembly screw 13, and the pressure block 11 moves downward. The front elastic reset member 9 and the rear elastic reset member 10 bring the front limit block 5 and the rear limit block 6 closer together. The front limit block 5 moves backward, causing the front end of the front fixing rod 7 to move out of the front fixing hole. The rear limit block 6 moves forward, causing the rear end of the rear fixing rod 8 to move out of the rear fixing hole. This separates the mounting frame 4 from the drill body 1, completing the disassembly of the toothed plate 2 and the drill body 1. When it is necessary to install the toothed plate 2, fit the mounting frame 4 into the disassembly groove. When the disassembly screw 13 is rotated, the pressure block 11 moves upward. The outer side of the pressure block 11 presses against the front limit block 5 and the rear limit block 6, causing the front limit block 5 to move out of the front fixing hole. The front fixed rod 7 moves forward while the rear limit block 6 moves backward, ultimately inserting the front part of the front fixed rod 7 into the front fixed hole and the rear part of the rear fixed rod 8 into the rear fixed hole. This fixes the mounting frame 4 in the disassembly and assembly slot, thus fixing the toothed rod 2 and the drill bit body 1 together. This allows for quick disassembly and assembly of the toothed rod 2 and the drill bit body 1, facilitating maintenance. The lower part of the drill bit body 1 is equipped with a radially retractable lower connector, which facilitates quick separation and assembly between the lower connector and the tubing, reducing the difficulty of disassembly and assembly between the drill bit and the tubing. The invention has a reasonable and compact structure, is easy to use, improves the wear resistance of the drill bit, facilitates the replacement and maintenance of the toothed rod 3, and can achieve the goal of reducing the number of drilling trips and reducing costs.

[0024] The aforementioned durable drill bits for oil exploration drilling can be further optimized and / or improved according to actual needs: As attached Figure 1As shown, the lower connector includes several fan-shaped annular connector blocks 14 that form a tubular structure when brought together radially, and an adjusting assembly for radially moving the connector blocks 14. The adjusting assembly includes a connecting rod 15, a sliding plate 16, a compression spring 17, a support plate 18, and an adjusting rod 19. A limiting groove 20 is provided at the center of the lower end of the drill bit body 1. The inner wall of the lower end of the limiting groove 20 is evenly distributed with adjusting grooves corresponding to the connector blocks 14 and arranged radially along the circumference. A connecting rod 15 is provided in each adjusting groove. A connecting rod 19 is fixedly installed on the outer side of the middle part of the connecting rod 15. Each sliding plate 16 is matched with a groove. A compression spring 17 is fitted onto the outside of the connecting rod 15 between the side of each sliding plate 16 away from the inner wall of the limiting groove 20 and the inner wall of the adjusting groove. The lower side of each sliding plate 16 is fixedly installed together with the upper side of a corresponding connector block 14. A support plate 18 is fitted inside the limiting groove 20, its outer side abutting against the end of the connecting rod 15. A through mounting hole is provided at the center of the upper end of the drill bit body 1. An adjusting rod 19 is provided inside the mounting hole, allowing the support plate 18 to move up and down within the limiting groove 20 when rotated. Depending on requirements, the outer surface of the support plate 18 can also be a tapered surface, wider at the top and narrower at the bottom. The ends of the connecting rod 15 near the adjusting rod 19 have inclined surfaces that match the outer surface of the support plate 18. There are four connector blocks 14. When the connector blocks 14 are close together, they form a tapered tubular structure, wider at the top and narrower at the bottom. When the connector blocks 14 are far apart, their outer connecting threads match the inner connecting threads of the tubing. In use, rotating the adjusting rod 19 moves the lower end of the support plate 18 downward to the inner side of the upper part of the connector block 14, which can support the inner side of the connector block 14, making it easier for the lower connector formed by the connector block 14 to connect with the pipe column. During disassembly, by rotating the adjusting rod 19, the support plate 18 moves upward and is located above the connecting rod 15. The end of the connecting rod 15 near the adjusting rod 19 moves closer to the adjusting rod 19 under the action of the compression spring 17. Then, the connecting rod 15 drives the connector block 14 to move inward in the radial direction, reducing the outer diameter of the lower connector formed by the connector block 14, which can quickly separate the lower connector from the pipe column. Disassembly and assembly are simple and convenient.

[0025] As attached Figure 1As shown, the adjusting rod 19 has a tubular structure. A connector 21 is fixedly installed at the upper end of the adjusting rod 19, corresponding to the upper position of the drill bit body 1. A limiting ring platform 29, whose upper end contacts the upper inner wall of the limiting groove 20, is fixed to the lower outer side of the adjusting rod 19. The support plate 18 has a through-hole adjusting screw hole in its center. The lower outer side of the adjusting rod 19 is screwed into the adjusting screw hole. Two limiting holes are spaced apart on the upper inner wall of the limiting groove 20. Each limiting hole contains a limiting pin 22, whose lower end is fixedly installed at the corresponding position on the upper end of the support plate 18. Depending on the requirements, the connector 21 can be a known technology, such as a nut or bolt. The limiting holes can also be located on the support plate 18. The lower part of the limiting pin 22 is fitted into the limiting hole, and the upper end of the limiting pin 22 is fixedly installed on the upper inner wall of the limiting groove 20. During use, by setting the connector 21 and the limiting pin 22, the support plate 18 can move up and down in the limiting groove 20 when the adjusting rod 19 is rotated, so as to prevent the support plate 18 from shifting and causing the connecting rod 15 and the connector block 14 to move inconsistently in the radial direction, which would make it difficult to install the connector block 14.

[0026] As attached Figure 1 As shown, the upper inner wall of the mounting hole is provided with a connecting annular groove 23. A number of interconnected water inlets 24 are evenly distributed around the outer side of the adjusting rod 19 at intervals along the circumference of the connecting annular groove 23. A water outlet groove is provided at the upper end of the drill bit body 1 corresponding to the position between each pair of adjacent tooth plates 2. Each water outlet groove has a flow channel 25 on its bottom wall, with its other end connected to the inner wall of the connecting annular groove 23. Depending on the requirements, the flow channel 25 can also be a connecting pipe fixedly connected between the water outlet groove and the connecting annular groove 23. During use, the connecting annular groove 23 ensures that the water inlets 24 and the connecting annular groove 23 remain connected during the rotation of the adjusting rod 19. Coolant flows out after passing through the inside of the adjusting rod 19, the water inlets 24, the flow channel 25, and the water outlet groove, cooling the gear 3 and removing chips.

[0027] As attached Figure 1 As shown, each water outlet is equipped with a nozzle 26. During use, this configuration increases the spray area and flow rate of the fluid in the water outlet, which can cool the gear 3 and remove chips, thus extending the service life of the gear 3.

[0028] As attached Figure 1As shown, the distance between the central axis of the connecting rod 15 and the upper end of the connector block 14 is no greater than the thickness of the support plate 18. Depending on the requirements, the distance between the central axis of the adjusting rod 19 and the upper inner wall of the limiting groove 20 is greater than the thickness of the support plate 18. In use, rotating the adjusting rod 19 moves the support plate 18 downward. The end of the connecting rod 15 near the adjusting rod 19 abuts against the outer side of the support plate 18 under the action of the compression spring 17. Then, rotating the adjusting rod 19 moves the lower end of the support plate 18 further downward to the upper inner side of the connector block 14. At this time, the upper outer side of the support plate 18 still abuts against the end of the connecting rod 15 near the adjusting rod 19, while the lower outer side of the support plate 18 can support the inner side of the connector block 14, making it easy for the lower connector formed after the connector blocks 14 are separated to connect with the pipe column. During disassembly, rotating the connecting piece 21 with the disassembly tool causes the adjusting rod 19 to rotate. After the adjusting rod 19 rotates, the support plate 18 moves upward and is positioned above the connecting rod 15. The end of the connecting rod 15 near the adjusting rod 19 abuts against the adjusting rod 19 under the action of the compression spring 17. Then, the connecting rod 15 drives the connector block 14 to move inward in the radial direction. The outer diameter of the lower connector formed by the connector block 14 decreases, allowing the lower connector to be quickly separated from the pipe column. Disassembly and assembly are simple and convenient.

[0029] As attached Figure 1 , 2 As shown in Figure 3, a downward-opening mounting groove 27 is provided on the lower side of the toothed palm 2 corresponding to the sliding groove position. The upper inner wall of the mounting groove 27 is provided with a disassembly and assembly screw hole communicating with the lower part of the sliding groove. The disassembly and assembly screw 13 is screwed into the disassembly and assembly screw hole, and the upper end of the disassembly and assembly screw 13 is rotatably connected to the lower part of the limiting plate 12. According to the requirements, the limiting plate 12 is fitted on the outer side of the upper end of the disassembly and assembly screw 13, and a fixing nut is screwed on the disassembly and assembly screw 13 corresponding to the upper and lower sides of the limiting plate 12. During use, by setting the mounting slot 27, it is easy to rotate the disassembly screw 13 with a tool, thereby causing the pressure block 11 to move up and down. Then, the front limit block 5 and the rear limit block 6 approach each other under the action of the front elastic reset member 9 and the rear elastic reset member 10. The front fixing rod 7 moves out of the front fixing rod 7, and the rear fixing rod 8 moves out of the rear fixing hole, separating the tooth plate 2 and the drill body 1 to complete the disassembly of the tooth plate 2 and the tooth cone 3. The disassembly and assembly are simple and facilitate the subsequent maintenance of the tooth cone 3 and the tooth plate 2.

[0030] As attached Figure 1 As shown, three toothed cones 2 are evenly distributed along the circumference of the outer side of the drill bit body 1, and each pair of adjacent toothed cones 3 mesh with each other. This design improves the overall stability of the drill bit during use.

[0031] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A durable drill bit for oil exploration drilling, characterized in that... The drill bit body includes a drill bit body, toothed plates, roller cones, a disassembly / assembly assembly, and a lower connector. Several toothed plates are evenly distributed around the circumference of the outer side of the drill bit body. Each toothed plate has a roller cone on its upper part. A disassembly / assembly groove with an outward opening is located on the lower outer side of the drill bit body corresponding to each toothed plate. A disassembly / assembly assembly that can be detachably installed in the disassembly / assembly groove is fixedly installed on the lower part of the toothed plate. The leftmost disassembly / assembly assembly includes a mounting frame, a front limit block, a rear limit block, a front fixing rod, a rear fixing rod, a front elastic reset component, a rear elastic reset component, and a pressure... The system includes a block, a limiting plate, and a disassembly screw. A mounting frame is fitted into a disassembly slot. A front limiting block and a rear limiting block are spaced apart within the mounting frame. A guide rod is fixedly installed on the upper part of the mounting frame, its front portion penetrating the upper part of the front limiting block, and its rear portion penetrating the upper part of the rear limiting block. A front elastic reset component fitted onto the outer side of the front portion of the guide rod is located on the front side of the front limiting block and the inner front side of the mounting frame. A rear elastic reset component fitted onto the outer side of the rear portion of the guide rod is located on the rear side of the rear limiting block and the inner rear side of the mounting frame. At least two front fixing rods are fixedly installed vertically at intervals on the front side of the front limiting block corresponding to the position below the guide rod. The front end of each front fixing rod passes through the front side of the mounting frame. A front fixing hole is provided on the inner front wall of the disassembly slot corresponding to each front fixing rod position. At least two rear fixing rods are fixedly installed vertically at intervals on the rear side of the rear limiting block corresponding to the position below the guide rod. The rear end of each rear fixing rod passes through the rear side of the mounting frame. A rear fixing hole is provided on the inner rear wall of the disassembly slot corresponding to each rear fixing rod position. An arc-shaped opening facing backwards is provided on the rear side of the lower end of the front limiting block. The front slide groove is symmetrically arranged with the rear slide groove on the front side of the lower end of the rear limit block. A tapered pressure block with a smaller upper part and a larger lower part is provided between the lower part of the front slide groove and the lower part of the rear slide groove. A sliding groove is provided on the right side of the tooth palm corresponding to the middle position of the mounting frame. A limit plate with the upper right side fixed together with the lower side of the pressure block is slidably installed in the sliding groove. A disassembly and assembly screw rod that can make the limit plate move up and down in the sliding groove is screwed to the lower side of the tooth palm. A radially retractable lower connector is installed at the lower part of the drill bit body. There are connecting threads on the outside of the lower connector. The lower connector includes several fan-shaped annular connector blocks that form a tubular structure when brought together radially, and an adjustment assembly that allows the connector blocks to move radially. The adjustment assembly includes a connecting rod, a sliding plate, a compression spring, a support plate, and an adjustment rod. A limiting groove is provided at the center of the lower end of the drill bit body. The inner wall of the lower end of the limiting groove is evenly distributed with adjustment grooves that correspond to the connector blocks and are radially arranged. A connecting rod is provided in each adjustment groove. A sliding plate that matches the adjustment groove is fixedly installed on the outer side of the middle part of the connecting rod. A compression spring is provided between the side of each sliding plate away from the inner wall of the limiting groove and the inner wall of the adjustment groove, which is fitted on the outer side of the connecting rod. The lower side of each sliding plate is fixedly installed together with the upper side of the corresponding connector block. A support plate that abuts against the end of the connecting rod is fitted in the limiting groove. A through mounting hole is provided at the center of the upper end of the drill bit body. An adjustment rod that allows the support plate to move up and down in the limiting groove when rotated is provided in the mounting hole.

2. The durable drill bit for oil exploration drilling according to claim 1, characterized in that... The adjusting rod has a tubular structure. A connector is sealed and fixedly installed at the upper end of the adjusting rod corresponding to the upper end of the drill bit body. A limiting ring platform with its upper end in contact with the inner wall of the upper part of the limiting groove is fixed on the lower outer side of the adjusting rod. The support plate has an adjusting screw hole that runs vertically through the center. The lower outer side of the adjusting rod is screwed into the adjusting screw hole. Two limiting holes are distributed at intervals on the upper inner wall of the limiting groove. Each limiting hole is fitted with a limiting pin whose lower end is fixedly installed together with the upper part of the support plate.

3. The durable drill bit for oil exploration drilling according to claim 2, characterized in that... The upper inner wall of the mounting hole is provided with a connecting ring groove. The outer side of the adjusting rod corresponding to the position of the connecting ring groove is provided with several water inlet holes that are connected internally and externally. The upper end of the drill bit body corresponding to the position between each two adjacent teeth is provided with a water outlet groove. The bottom wall of each water outlet groove is provided with a flow channel whose other end is connected to the inner wall of the connecting ring groove.

4. The durable drill bit for oil exploration drilling according to claim 3, characterized in that... Each water outlet is equipped with a fixed nozzle.

5. The durable drill bit for oil exploration drilling according to claim 1, 2, 3, or 4, characterized in that... The distance between the central axis of the connecting rod and the upper end of the joint block is not greater than the thickness of the support plate.

6. The durable drill bit for oil exploration drilling according to claim 1, 2, 3, or 4, characterized in that... The lower side of the toothed palm corresponding to the sliding groove position is provided with an opening downward mounting groove. The upper inner wall of the mounting groove is provided with a disassembly and assembly screw hole that communicates with the lower part of the sliding groove. The disassembly and assembly screw is screwed into the disassembly and assembly screw hole, and the upper end of the disassembly and assembly screw is rotatably connected to the lower part of the limiting plate.

7. The durable drill bit for oil exploration drilling according to claim 5, characterized in that... The lower side of the toothed palm corresponding to the sliding groove position is provided with an opening downward mounting groove. The upper inner wall of the mounting groove is provided with a disassembly and assembly screw hole that communicates with the lower part of the sliding groove. The disassembly and assembly screw is screwed into the disassembly and assembly screw hole, and the upper end of the disassembly and assembly screw is rotatably connected to the lower part of the limiting plate.

8. The durable drill bit for oil exploration drilling according to claim 1, 2, 3, 4, or 7, characterized in that... The drill bit body has three teeth evenly spaced along the circumference on the outer side, and each pair of adjacent teeth meshes with each other.

9. The durable drill bit for oil exploration drilling according to claim 5, characterized in that... The drill bit body has three teeth evenly spaced along the circumference on the outer side, and each pair of adjacent teeth meshes with each other.

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