A PDC drill bit for preventing bit eccentric wear

Abstract

This utility model relates to the field of PDC drill bits, specifically to a PDC drill bit for preventing uneven wear. It includes a drill bit body, a main body for drilling, and a slanted center slot, both located on the lower outer side of the drill bit body to assist in mounting the cutting blades. A matching block is fixedly installed inside the slanted center slot, and a sliding block is embedded above the matching block. A PDC cutting blade is fixedly installed outside the sliding block, and a center contact block is fixedly installed at the bottom of the PDC cutting blade. An inner mounting groove is formed at the bottom of the drill bit body. This utility model includes a slanted center slot, a matching block, a sliding block, PDC cutting blades, a center contact block, a central drill body, a central drill bit, and a center contact groove. When using this PDC drill bit, the central drill body and the central drill bit can be first installed at the bottom of the drill bit body through the inner mounting groove and the inner mounting block, and then fastening bolts are used to strengthen the stability of the connection between the drill bit body and the central drill body.

Description

Technical Field

[0001] This utility model relates to the field of PDC drill bits, specifically to a PDC drill bit that prevents uneven wear. Background Technology

[0002] PDC drill bits, also known as polycrystalline diamond composite drill bits, are core rock-breaking tools in oil and gas drilling, geological exploration, and other fields. They are composed of a drill body, PDC cutting teeth, crown structure, gauge protection system, and hydraulic system. The core PDC cutting teeth are made of a composite of polycrystalline diamond layer and tungsten carbide substrate, which shears rock through a negative rake angle. They are suitable for soft to medium-hard formations, achieving high-efficiency drilling under low drilling pressure and high rotation speed. They have low cost per unit footage and account for more than 70% of the oil and gas drilling market. The drill body is selected from steel or matrix depending on the formation characteristics. The crown structure balances drilling speed and stability through the design of internal cones and shoulders. The hydraulic system controls the drilling fluid flow through nozzles, cools the cutting teeth, and carries rock cuttings to the cuttings chute to prevent mud packing. PDC drill bits have significant comprehensive advantages, but they must be avoided in formations such as gravel and hard interlayers that are prone to impact damage. They are a key technical equipment in modern drilling engineering.

[0003] Existing PDC drill bits lack the ability to prevent uneven wear during use. This can lead to radial vibration when the drill bit rotates at high speed, which exacerbates the wear of the cutter blade edges. Furthermore, traditional designs cannot dynamically adjust the cutter blade position, requiring the entire drill bit to be replaced after wear, resulting in high maintenance costs. Over long-term use, asymmetrical forces can more easily cause uneven wear on the drill bit body.

[0004] Therefore, it is necessary to invent a PDC drill bit that prevents uneven wear to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a PDC drill bit that prevents uneven wear. This PDC drill bit achieves its anti-uneven wear capability through a slanted center groove, a mating block, a sliding block, a PDC cutting blade, a center contact block, a center drill body, a center drill bit, and a center contact groove. This design achieves precise radial positioning of the PDC cutting blade through a wedge-shaped guide structure. The slanted guide surface can automatically correct installation deviations, avoiding unilateral wear caused by blade misalignment in traditional drill bits. Furthermore, the nested design of the center contact block and the center contact groove forms an axial support axis, which, combined with the rigid connection of the center drill body, constructs a dual anti-torsional system from the outer ring blade to the center drill body. This effectively suppresses radial oscillation during drill bit rotation, reducing the probability of uneven wear. This addresses the problem of existing technologies lacking the ability to prevent uneven wear, which leads to radial vibration during high-speed rotation, exacerbating blade edge wear. Moreover, traditional designs cannot dynamically adjust blade position, requiring complete drill bit replacement after wear, resulting in high maintenance costs. Furthermore, under long-term use, asymmetrical forces are more likely to cause uneven wear of the drill bit body.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a PDC drill bit for preventing uneven wear, comprising a drill bit base and a main body for drilling;

[0007] The drill bit body has oblique grooves, all located on the lower outer side of the drill bit body, for assisting in the installation of the cutting blades. A matching block is fixedly installed inside the oblique grooves, and a sliding block is embedded above the matching block. A PDC cutting blade is fixedly installed outside the sliding block, and a center contact block is fixedly installed at the bottom of the PDC cutting blade. The bottom of the drill bit body has an inner mounting groove, inside which an inner mounting block is embedded. A center drill body is fixedly installed at the bottom of the inner mounting block, and a center drill bit is fixedly installed at the bottom of the center drill body. A fastening bolt is threaded through the bottom periphery of the center drill body, and a center contact groove is formed on the outside of the center drill body.

[0008] The drill rod is fixedly installed on the top of the drill bit body for the installation of the drill bit. A threaded groove is opened on the upper outer side of the drill bit body, and an outer abutment mounting sleeve is rotatably connected to the outside of the threaded groove.

[0009] Preferably, the number of the inclined centering slots is set to multiple, and the multiple inclined centering slots are distributed in a ring array on the drill bit base.

[0010] Preferably, the PDC cutting blade is slidably connected to the drill bit body, and PDC cutting teeth are fixedly installed on the outside of the PDC cutting blade.

[0011] Preferably, the inner mounting block fixedly installed above the central drill body engages with the inner mounting groove opened at the bottom of the drill bit base, and the fastening bolts are distributed in a ring array on the central drill body.

[0012] Preferably, the central contact block fixedly installed on the bottom outer side of the PDC cutting blade abuts against the central drill body, and the central contact block is used in conjunction with the central contact groove.

[0013] Preferably, an inclined centering block is embedded inside the inclined centering groove, and a fixing pressure ring is fixedly installed above the inclined centering block.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0015] This utility model includes an oblique centering groove, a mating block, a sliding block, a PDC cutting blade, a center contact block, a center drill body, a center drill bit, and a center contact groove. When using this PDC drill bit, the center drill body and center drill bit can be installed first at the bottom of the drill bit base through the inner mounting groove and inner mounting block. Then, fastening bolts are used to strengthen the stability of the connection between the drill bit base and the center drill body. Thus, when installing the PDC cutting blade, in addition to the sliding block contacting the mating block in the oblique centering groove, the center contact block at the bottom of the PDC cutting blade must also simultaneously contact the center contact groove. Through multiple surrounding contacting PDC cutting blades... The C-shaped cutting blade enhances the stability of the center drill bit and also determines the position of the PDC cutting blade. This fixed installation enables the PDC drill bit to prevent uneven wear. This design achieves precise radial positioning of the PDC cutting blade through a wedge-shaped guide structure. The inclined guide surface can automatically correct installation deviations, avoiding unilateral wear caused by blade misalignment in traditional drill bits. Moreover, the nested design of the center contact block and the center contact groove forms an axial support axis. Combined with the rigid connection of the center drill body, it constructs a dual anti-torsional system from the outer ring blade to the center drill body, effectively suppressing radial oscillation during drill bit rotation and reducing the probability of uneven wear. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the PDC cutting blade structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the central drill bit structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the fixed pressure ring structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the outer contact mounting cylinder structure of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Drill bit body; 2. Angled center groove; 3. Matching block; 4. Sliding block; 5. PDC cutting blade; 6. PDC cutting teeth; 7. Center contact block; 8. Inner mounting groove; 9. Inner mounting block; 10. Center drill body; 11. Center drill bit; 12. Fastening bolt; 13. Center contact groove; 14. Angled center block; 15. Fixing pressure ring; 16. Butt drill rod; 17. Threaded groove; 18. Outer contact mounting sleeve. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] This utility model provides, for example Figure 1-5 The PDC drill bit shown is designed to prevent uneven wear and includes a drill bit body 1, which is a main body for drilling.

[0026] The obliquely opposite center groove 2 is opened on the lower outer side of the drill bit body 1 to assist in the installation of the cutter wings. The obliquely opposite center groove 2 has a matching block 3 fixedly installed inside. The matching block 3 is inlaid with a sliding block 4 above it. The sliding block 4 is fixedly installed with a PDC cutting blade 5 outside. The bottom end of the PDC cutting blade 5 is fixedly installed with a center contact block 7. The bottom of the drill bit body 1 has an inner mounting groove 8. The inner mounting groove 8 has an inner mounting block 9 inlaid inside. The bottom of the inner mounting block 9 is fixedly installed with a center drill body 10. The bottom of the center drill body 10 is fixedly installed with a center drill bit 11. The bottom periphery of the center drill body 10 is threaded with a fastening bolt 12. The outside of the center drill body 10 has a center contact groove 13.

[0027] The drill rod 16 is fixedly installed on the top of the drill bit base 1 for mounting the drill bit. A threaded groove 17 is provided on the upper part of the drill bit base 1. An outer contact mounting sleeve 18 is rotatably connected to the outside of the threaded groove 17. The outer contact mounting sleeve 18 can be rotated by the thread to abut the upper end of the PDC cutting blade 5 below, reducing the shaking of the PDC cutting blade 5 during machining, thereby enhancing the overall stability of the PDC cutting blade 5 after installation on the drill bit.

[0028] like Figure 1 , Figure 2 and Figure 3As shown, the number of oblique center grooves 2 is set to multiple, and the multiple oblique center grooves 2 are distributed in a ring array on the drill bit base 1. The ring distribution makes the oblique center grooves 2 evenly arranged along the circumference of the drill bit, forming a symmetrical support structure. This design ensures that the drill bit is subjected to uniform force in all directions when rotating at high speed, avoiding the stress concentration on one side caused by the traditional asymmetrical structure. The PDC cutting blade 5 is slidably connected to the drill bit base 1. PDC cutting teeth 6 are fixedly installed on the outside of the PDC cutting blade 5. The sliding block 4 slides in the oblique center groove 2 and forms a guide limit system with the matching block 3 to ensure that the blade maintains accurate radial positioning during sliding and avoids the cutting trajectory deviation caused by excessive sliding. The inner mounting block 9 fixedly installed above the central drill body 10 is engaged with the inner mounting groove 8 opened at the bottom of the drill bit base 1. The fastening bolts 12 are distributed in a ring array on the central drill body 10. The wedge-shaped engagement between the inner mounting block 9 and the inner mounting groove 8 forms a mechanical interlocking structure, which improves the shear resistance.

[0029] like Figure 1 , Figure 4 and Figure 5 As shown, the center contact block 7 fixedly installed on the bottom external side of the PDC cutting blade 5 abuts against the center drill body 10. The center contact block 7 works in conjunction with the center contact groove 13. The center contact block 7 at the bottom of the PDC cutting blade 5 also abuts against the center contact groove 13 simultaneously. The stability of the center drill bit 11 is enhanced by multiple PDC cutting blades 5 that abut around each other. An oblique centering block 14 is embedded inside the oblique centering groove 2. A fixing pressure ring 15 is fixedly installed above the oblique centering block 14. The fixing pressure ring 15 and the oblique centering block 14 can be inserted into the excess gap of the oblique centering groove 2, thereby increasing the stability of the PDC cutting blade 5 installation.

[0030] The working principle of this practical tool is as follows: When using this PDC drill bit, first remove the drill bit body 1. Then, install the center drill body 10 and center drill bit 11 at the bottom of the drill bit body 1 via the inner mounting groove 8 and inner mounting block 9. Next, use the fastening bolts 12 to strengthen the stability of the connection between the drill bit body 1 and the center drill body 10. When installing the PDC cutting blade 5, in addition to ensuring the sliding block 4 abuts against the matching block 3 in the oblique centering groove 2, the center contact block 7 at the bottom of the PDC cutting blade 5 must also simultaneously abut against the center contact groove 13. This multiple surrounding contacting PDC cutting blades 5 strengthen the stability of the center drill bit 11 and also determine the position of the PDC cutting blade 5. Then, insert the fixing ring 15 and oblique centering block 14 into the excess gap in the oblique centering groove 2, thereby increasing the stability of the PDC cutting blade 5 installation. After installation, the outer contact block can be rotated downwards through the threaded groove 17 on the top of the drill bit body 1. The mounting sleeve 18 presses down and tightens the outer abutting mounting sleeve 18, the abutting fixing ring 15, the oblique centering block 14, and the upper end of the PDC cutting blade 5, thus achieving abutting installation. This enables the PDC drill bit to prevent uneven wear when used. The wedge-shaped guide structure achieves precise radial positioning of the PDC cutting blade 5, and the oblique guide surface can automatically correct installation deviations, avoiding unilateral wear caused by blade misalignment in traditional drill bits. Moreover, the nested design of the center abutting block 7 and the center abutting groove 13 forms an axial support axis, which, together with the rigid connection of the center drill body 10, constructs a double anti-torsion system from the outer ring blade to the center drill body 10, effectively suppressing radial oscillation during drill bit rotation and reducing the probability of uneven wear. Finally, after completing the installation and use of the PDC drill bit according to the above operations, routine maintenance of the drill bit is required. This completes the use of the PDC drill bit that prevents uneven wear.

[0031] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A PDC drill bit for preventing uneven wear, characterized in that: include Drill bit body (1), the main body used for drilling; The oblique center groove (2) is located on the lower outer side of the drill bit body (1) to assist in the installation of the cutter wings. The oblique center groove (2) is fixedly installed with a matching block (3). A sliding block (4) is embedded above the matching block (3). A PDC cutting blade (5) is fixedly installed on the outside of the sliding block (4). A center contact block (7) is fixedly installed on the bottom of the PDC cutting blade (5). An inner mounting groove (8) is opened at the bottom of the drill bit body (1). An inner mounting block (9) is embedded inside the inner mounting groove (8). A center drill body (10) is fixedly installed at the bottom of the inner mounting block (9). A center drill bit (11) is fixedly installed at the bottom of the center drill body (10). A fastening bolt (12) is threaded through the bottom periphery of the center drill body (10). A center contact groove (13) is opened on the outside of the center drill body (10). The drill rod (16) is fixedly installed on the top of the drill bit base (1) for the installation of the drill bit. A threaded groove (17) is provided on the upper part of the drill bit base (1), and an outer abutting mounting cylinder (18) is rotatably connected to the outside of the threaded groove (17).

2. The PDC bit of claim 1, wherein: The number of the oblique center grooves (2) is set to multiple, and the multiple oblique center grooves (2) are distributed in a ring array on the drill bit base (1).

3. The PDC bit of claim 1, wherein: The PDC cutting blade (5) is slidably connected to the drill bit body (1), and PDC cutting teeth (6) are fixedly installed on the outside of the PDC cutting blade (5).

4. A PDC drill bit for preventing uneven wear according to claim 1, characterized in that: The inner mounting block (9) fixedly installed above the central drill body (10) engages with the inner mounting groove (8) opened at the bottom of the drill bit base (1), and the fastening bolts (12) are distributed in a ring array on the central drill body (10).

5. The PDC bit of claim 1, wherein: The center contact block (7) fixedly installed on the bottom of the PDC cutting blade (5) abuts against the center drill body (10), and the center contact block (7) is used in conjunction with the center contact groove (13).

6. The PDC bit of claim 1, wherein: The inclined centering groove (2) is inlaid with an inclined centering block (14), and a fixing pressure ring (15) is fixedly installed above the inclined centering block (14).

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