Diamond compact drill bit for drilling

Abstract

The invention discloses a diamond compact drill bit for drilling, and particularly relates to the technical field of drilling drills, the diamond compact drill bit comprises a reinforcing seat, a drilling control assembly is arranged on the reinforcing seat, the drilling control assembly comprises a tray arranged at the top of the reinforcing seat, and the tray is inserted into the middle of the reinforcing seat through an embedded hole; and a plurality of diamond compacts are arranged at the top of the tray. The diamond composite drilling blocks can be gathered towards the axis, so that stress points of the reinforced crushing teeth and the diamond composite drilling blocks are concentrated, and a local high-strength crushing area is formed; in a soft rock stratum, a drilling block can be diffused to enlarge the cutting range, self-adaptive adjustment of a drilling strategy is achieved, stepped grooves are formed between the stacked diamond composite sheet bodies and the adjacent sheet bodies, single-point pressure is dispersed through stepped abrasion, after the sheet body on the top layer is abraded, the sheet body on the lower layer continues to participate in drilling, and drilling efficiency is improved. And the stepped grooves of the laminated diamond compacts form a multi-stage crushing surface, so that the impact stress is dispersed, and single-point cracking is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling bits, and more particularly to a diamond composite drill bit for drilling. Background Art

[0002] During downhole drilling, the intense friction between the high-speed drill bit and the rock formation causes varying degrees of damage and destruction to the drill bit. In existing actual downhole drilling, a high-strength and high-wear-resistant diamond composite sheet is generally welded to the front end of the drill bit's cutting claws for drilling. However, during use of this type of drill bit, although the diamond composite sheet has extremely high hardness and the drilling efficiency is improved, the cutting claws used to fasten and install the diamond composite sheet wear very heavily. After being worn to a certain limit, the diamond composite sheet will lose its function of fastening the diamond composite sheet, which seriously affects the overall service life of the diamond composite drill bit.

[0003] Among them, patent publication number CN204899783U discloses a wear-resistant diamond composite drill bit, comprising a drill body, a cutting claw provided at the end of the drill body, a positioning groove for embedding the drill bit on the cutting claw, a diamond composite sheet embedded in the outer arc surface of the cutting claw, and the outer surface of the diamond composite sheet is flush with or protrudes from the outer arc surface of the cutting claw;

[0004] When this structure is in use, when processing the cutting claw, one or more cylindrical grooves matching the shape of the diamond composite sheet are processed on the outer arc wall of the cutting claw, and diamond composite sheets with matching shapes are embedded and welded in these grooves. The outer surface of the diamond composite sheet can be flush with the outer arc surface of the cutting claw, or slightly protrude from the outer arc surface of the cutting claw. During the drilling process, the original outer diameter of the cutting claw can be protected and the wear resistance of the cutting claw can be improved. However, the cutting claw of this structure is fixed and cannot be adjusted to the corresponding angle according to the hardness requirements during drilling. It is not easy to gather the force points at a certain place during drilling, resulting in low drilling efficiency. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a diamond composite drill bit for drilling, which aims to solve the problems raised in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a diamond composite drill bit for drilling, comprising a reinforcement seat, on which a control drilling assembly is provided;

[0007] The control drilling assembly includes a tray arranged on the top of the reinforcement seat, the tray is inserted into the middle of the reinforcement seat through an embedded hole, a plurality of diamond composite sheets are arranged on the top of the tray, and the plurality of diamond composite sheets are stacked, and a stepped groove is formed between each adjacent two diamond composite sheets, and a discharge groove is opened on the outer side of the diamond composite sheet;

[0008] A plurality of diamond composite drilling blocks are provided on the outside of the tray, and a reinforced crushing tooth is provided on one side of each of the diamond composite drilling blocks, the end of the diamond composite drilling block is hinged with a hinged seat, and a reinforcing oblique rod is fixedly provided at the bottom end of the hinged seat, the vertical cross-section of the diamond composite drilling block is set to an arc shape, and a slide groove is provided on one side of the diamond composite drilling block, and a plurality of top rods are distributed on the outside of the tray, one end of each of the top rods extends into the corresponding slide groove and is slidably connected to the slide groove, a plurality of limiting holes are provided on the top of the reinforcing seat, and a vertical rod is slidably connected in each of the limiting holes, the top ends of the plurality of vertical rods are respectively fixed to the bottom of the corresponding top rod, and the bottom end of the reinforcing oblique rod is tilted downward and fixed on the reinforcing seat, and the vertical cross-section shape of the plurality of reinforcing oblique rods and the diamond composite drilling block is combined into a truncated cone shape;

[0009] Optionally, in a possible embodiment, a guide ring groove is provided at the bottom of the reinforcing seat, a reinforcing ring is slidably connected in the guide ring groove, a reinforcing mounting plate is fixedly provided on the bottom end of the reinforcing ring, an inner wire tube is fixedly provided on the reinforcing mounting plate, the middle part of the inner wire tube is threadedly connected with a screw rod, the screw rod is located in the embedded hole, and the top end of the screw rod is fixedly provided on the tray, a plurality of limiting holes are provided starting from the middle part of the guide ring groove, and each of the limiting holes is located on the bottom surface of the reinforcing seat, a plurality of locking rods are provided on the reinforcing mounting plate, and each of the locking rods extends into the corresponding limiting hole, a main shaft is provided on the side of the reinforcing mounting plate away from the reinforcing seat, the main shaft is fixed on the reinforcing mounting plate, and the main shaft and the tray are in the same axial direction;

[0010] Technical effects and advantages of the present invention:

[0011] 1. The present invention uses a tray that moves up and down along the embedded hole of the reinforced base, and then, through the sliding cooperation between the push rod and the slide groove, drives the diamond composite drilling block to rotate about the hinged base. When drilling harder rock formations, the diamond composite drilling block can be gathered toward the axis, concentrating the stress points of the reinforced crushing teeth and the diamond composite drilling block, forming a localized high-intensity crushing area. In soft rock formations, the drilling block can be spread out to expand the cutting range, achieving adaptive adjustment of the drilling strategy.

[0012] 2. The present invention uses stacked diamond composite sheets on the top of the tray, forming stepped grooves between adjacent sheets. This not only disperses single-point pressure through stepped wear, but also allows the lower sheets to continue drilling after the top sheet is worn. The stepped grooves of the stacked diamond composite sheets form multi-level crushing surfaces, dispersing impact stress and avoiding single-point cracking.

[0013] 3. The discharge groove on the outer surface of the diamond composite sheet, the frustum-shaped diamond composite drilling block, and the reinforced inclined rod form a continuous chip removal channel. Rock cuttings generated during drilling can be quickly discharged along the inclined surface of the inclined rod and the stepped groove, preventing debris accumulation from affecting drilling efficiency. Furthermore, the reinforced inclined rod and the articulated seat form a triangular support structure. Combined with the sliding limit of the guide ring groove and the reinforcing ring, the drill bit maintains structural stability during high-speed rotation and reduces vibration loss.

[0014] In summary, when drilling in harder rock formations, the diamond composite drilling blocks can be gathered toward the axis to concentrate the stress points of the reinforced crushing teeth and diamond composite drilling blocks, forming a local high-strength crushing area; while in soft rock formations, the drilling blocks can be spread out to expand the cutting range and achieve adaptive adjustment of the drilling strategy. The stacked diamond composite sheets form stepped grooves between adjacent sheets, which not only disperses the single-point pressure through stepped wear, but also allows the lower sheets to continue to participate in drilling after the top sheet is worn. The stepped grooves of the stacked diamond composite sheets form a multi-level crushing surface, which disperses the impact stress and avoids single-point cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0016] Figure 1 It is the main view of the overall structure of the present invention.

[0017] Figure 2 It is a side view of the overall structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the reinforcement seat, reinforcement mounting plate, main shaft, diamond composite drilling block, articulated seat and reinforcement diagonal rod of the present invention.

[0019] Figure 4 Schematic diagram of the diamond composite body of the present invention.

[0020] Figure 5Schematic diagram of the diamond composite drilling block and reinforced crushing teeth of the present invention.

[0021] Figure 6 It is a schematic diagram of the reinforcement seat, reinforcement diagonal rod and hinged seat of the present invention.

[0022] Figure 7 Schematic diagram of the main shaft, reinforced mounting plate, inner thread barrel and locking rod of the present invention.

[0023] Figure 8 This is a schematic diagram of the tray, screw rod, mandrel, vertical rod and diamond composite drilling block of the present invention.

[0024] Figure 9 This is a schematic diagram of the reinforced mounting plate, reinforced seat, hinged seat, reinforced diagonal rod, guide ring groove and reinforced ring of the present invention.

[0025] The accompanying drawings are marked as follows: 1. Reinforced seat; 2. Embedded hole; 3. Tray; 4. Diamond composite sheet; 5. Step groove; 6. Discharge trough; 7. Diamond composite drilling block; 8. Reinforced crushing teeth 9. Articulated seat; 10. Reinforced diagonal rod; 11. Slide groove; 12. Push rod; 13. Limiting hole; 14. Vertical rod; 15. Guide ring groove; 16. Reinforcement ring; 17. Reinforced mounting plate; 18. Inner wire tube; 19. Screw rod; 20. Limiting hole; 21. Locking rod; 22. Spindle. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] As attached Figure 1 -Attached Figure 9 The diamond composite drill bit shown in the figure uses a control drilling assembly provided on a reinforcement base 1. The tray 3 is moved up and down along the inner hole 2 of the reinforcement base 1, and the sliding engagement of the push rod 12 and the slide groove 11 drives the diamond composite drilling block 7 to rotate about the articulated base 9. When drilling in harder rock formations, the diamond composite drilling block 7 can be gathered toward the axis, concentrating the stress points of the reinforced crushing teeth 8 and the diamond composite drilling block 7, forming a localized high-intensity crushing area. In softer rock formations, the drilling blocks can be spread out to expand the cutting range, achieving adaptive adjustment of the drilling strategy. The specific structural configuration of the assembly is as follows:

[0028] The control drilling assembly includes a tray 3 arranged on the top of the reinforcement base 1. The tray 3 is inserted into the middle of the reinforcement base 1 through the embedded hole 2. A plurality of diamond composite sheets 4 are arranged on the top of the tray 3. The multiple diamond composite sheets 4 are stacked, and a stepped groove 5 is formed between each adjacent two diamond composite sheets 4. A discharge groove 6 is opened on the outside of the diamond composite sheet 4.

[0029] As attached Figure 1 、 2 As shown in Figures 3 and 4, the tray 3 is used as a support point. The tray 3 is displaced on the reinforcement seat 1, and then each diamond composite sheet 4 is displaced, so that the diamond composite sheet 4 can be extended, so that the diamond composite sheet 4 can be targeted for drilling harder areas. At the same time, each step groove 5 and discharge groove 6 facilitates the discharge of waste chips generated during the drilling of the diamond composite sheet 4.

[0030] Several diamond composite drilling blocks 7 are arranged on the outside of the tray 3, and a reinforced crushing tooth 8 is provided on one side of each diamond composite drilling block 7. The end of the diamond composite drilling block 7 is hinged with a hinge seat 9, and a reinforced inclined rod 10 is fixed to the bottom end of the hinge seat 9;

[0031] As attached Figure 1 、 2 As shown in Figures 3 and 6, the diamond composite drilling block 7 rotates along the axis point of the connection between the diamond composite drilling block 7 and the articulated seat 9, thereby adjusting the angle of the diamond composite drilling block 7, so that the diamond composite drilling block 7 can be gathered or spread axially toward the reinforcement seat 1, thereby adjusting the size of the diamond composite drilling block 7 during drilling, and bringing the various diamond composite drilling blocks 7 together when drilling in harder drilling areas. The provision of the reinforced crushing teeth 8 improves the crushing performance of the diamond composite drilling block 7 when rotating to drill its side, thereby improving the drilling efficiency.

[0032] The vertical cross-section of the diamond composite drilling block 7 is set to an arc shape, and a slide groove 11 is opened on one side of the diamond composite drilling block 7. A plurality of push rods 12 are distributed on the outside of the tray 3. One end of each push rod 12 extends into the corresponding slide groove 11 and is slidably connected to the slide groove 11; as shown in the attached Figure 8 As shown, when the tray 3 moves upward, it drives the push rod 12 to move. The push rod 12 is slidably connected to the slide 11, and then the diamond composite drilling block 7 is forced to rotate along the axis point where the diamond composite drilling block 7 is connected to the reinforcing inclined rod 10, so as to adjust the angle of the diamond composite drilling block 7. The top of the reinforcing seat 1 is provided with a plurality of limiting holes 13, and each limiting hole 13 is slidably connected to a vertical rod 14. The top ends of the plurality of vertical rods 14 are respectively fixed to the bottom ends of the corresponding push rods 12; as shown in the attached figure, Figure 6 and 8As shown, when the tray 3 is displaced, the push rod 12 is driven to displace, and the displacement stroke of the push rod 12 and the tray 3 is guided and limited by the corresponding cooperation of the limiting hole 13 and the vertical rod 14, thereby ensuring the stability of the tray 3 during displacement.

[0033] A guide ring groove 15 is provided at the bottom of the reinforcement seat 1. A reinforcement ring 16 is slidably connected in the guide ring groove 15. A reinforcement mounting plate 17 is fixedly provided at the bottom end of the reinforcement ring 16.

[0034] As attached Figure 7 and 9 As shown, the reinforcement ring 16 and the guide ring groove 15 are used in conjunction with each other, so that the reinforcement mounting plate 17 can be rotated along the guide ring groove 15 through the reinforcement ring 16 .

[0035] An inner thread cylinder 18 is fixedly provided on the reinforcing mounting plate 17, and a screw rod 19 is threadedly connected to the middle portion of the inner thread cylinder 18. The screw rod 19 is located in the embedded hole 2, and the top end of the screw rod 19 is fixedly provided on the tray 3;

[0036] As attached Figure 8 and 9 As shown, by rotating the reinforcement seat 1 or the reinforcement mounting plate 17, through the threaded connection of the inner wire cylinder 18 and the screw rod 19, the inner wire cylinder 18 and the screw rod 19 can be displaced in opposite directions, and then the tray 3 is displaced. When the tray 3 is displaced, the various push rods 12 are driven to displace to achieve the function of adjusting the angle of the diamond composite drilling block 7. The corresponding cooperation of the reinforcement ring 16 and the guide ring groove 15 guides the reinforcement seat 1 or the reinforcement mounting plate 17 when rotating, ensuring the stability of the reinforcement seat 1 and the reinforcement mounting plate 17 when rotating.

[0037] A plurality of limiting holes 20 are formed in the middle of the guide ring groove 15, and each limiting hole 20 is located on the bottom surface of the reinforcement seat 1. A plurality of locking rods 21 are provided on the reinforcement mounting plate 17, and each locking rod 21 extends into a corresponding limiting hole 20.

[0038] As attached Figure 8 and 9 As shown, the reinforcing seat 1 and the reinforcing mounting plate 17 are positioned by correspondingly cooperating with the limiting hole 20 and the locking rod 21, ensuring the stability of the connection between the reinforcing seat 1 and the reinforcing mounting plate 17, and also facilitating the locking of the reinforcing seat 1 and the reinforcing mounting plate 17 after rotation adjustment.

[0039] A main shaft 22 is provided on the side of the reinforcing mounting plate 17 away from the reinforcing seat 1. The main shaft 22 is fixed on the reinforcing mounting plate 17. The main shaft 22 and the tray 3 are in the same axial direction.

[0040] As attached Figure 1 、 2As shown in Figures 3, 7 and 9, the arrangement of the main shaft 22 makes it convenient to fix the main shaft 22 on a drilling rig, which drives the drill bit to rotate for drilling.

[0041] The bottom end of the reinforcement oblique rod 10 is fixed on the reinforcement seat 1 at an angle downward, and the vertical cross-section of the plurality of reinforcement oblique rods 10 and the diamond composite drilling block 7 is combined into a truncated cone shape;

[0042] As attached Figure 1 、 2 As shown in FIG3 , the truncated cone-shaped cross section of the reinforced inclined rod 10 and the diamond composite drilling block 7 facilitates the drill bit to penetrate deep into the sampling area to be drilled, and each reinforced inclined rod 10 is tilted downward to facilitate the discharge of waste chips generated during drilling.

[0043] The specific working principle is as follows: connect the main shaft 22 to the drilling rig, pre-adjust the drilling angle according to the hardness of the rock formation, rotate the reinforcing mounting plate 17, so that the screw 19 drives the inner wire tube 18 to move axially, and then the tray 3 rises or falls. The tray 3 pushes the top rod 12 to slide along the slide groove 11, and the diamond composite drilling block 7 rotates around the hinge seat 9 to achieve hard rock gathering or soft rock diffusion, and then insert the locking rod 21 into the limit hole 20 to fix the angle.

[0044] In the hard rock attack mode, the concentrated drilling blocks 7 enable the reinforced crushing teeth 8 to focus on a small area of ​​rock. The stepped grooves 5 of the stacked diamond composite sheets 4 gradually crush the rock mass, reducing single-point loads. In the soft rock high-efficiency mode, the diffused drilling blocks 7 expand the cutting coverage, and the discharge chute 6 discharges rock chips at high speed to prevent drilling sticking.

[0045] When the main shaft 22 drives the drill bit to rotate at high speed, the top diamond composite sheet 4 first contacts the rock formation, and the stacked sheets and the stepped grooves 5 form a multi-level cutting surface to initially crush the rock formation; at the same time, the outer diamond composite drilling block 7 participates in drilling with different cutting radii according to the different angle adjustment states, strengthening the shear and impact effect of the crushing teeth 8 on the rock formation. Especially in the gathered state, the concentrated force of the crushing teeth can effectively crush the hard rock structure.

[0046] During drilling, rock cuttings are discharged outward along the discharge groove 6 of the diamond compact 4. Simultaneously, the frustum-shaped drilling block and the reinforcing rod 10 form an inclined guide surface. Centrifugal force allows the rock cuttings to be discharged outward through the gap between the guide ring groove 15 and the reinforcing ring 16. Furthermore, the layered structure of the stepped groove 5 stores a small amount of drilling fluid injected into the borehole. This forms a liquid film during rotation, helping to cool the diamond compact 4 and drilling block, reducing high-temperature wear.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A diamond composite drill bit for drilling, comprising a reinforcement seat (1), characterized in that: The reinforcement seat (1) is provided with a regulating drilling assembly; The control drilling assembly includes a tray (3) arranged on the top of the reinforcement seat (1), the tray (3) is inserted into the middle of the reinforcement seat (1) through the embedded hole (2), a plurality of diamond composite sheets (4) are arranged on the top of the tray (3), a plurality of diamond composite sheets (4) are stacked, and a stepped groove (5) is formed between each two adjacent diamond composite sheets (4), and a discharge groove (6) is opened on the outer side of the diamond composite sheet (4); A plurality of diamond composite drilling blocks (7) are provided on the outside of the tray (3), and a reinforced crushing tooth (8) is provided on one side of each diamond composite drilling block (7). The end of the diamond composite drilling block (7) is hinged with a hinge seat (9), and a reinforced inclined rod (10) is fixedly provided at the bottom end of the hinge seat (9).

2. The diamond composite drill bit for drilling according to claim 1, characterized in that: The vertical cross-section of the diamond composite drilling block (7) is arranged in an arc shape, and a slide groove (11) is provided on one side of the diamond composite drilling block (7). A plurality of push rods (12) are distributed on the outside of the tray (3), and one end of each of the push rods (12) extends into a corresponding slide groove (11) and is slidably connected to the slide groove (11).

3. The diamond composite drill bit for drilling according to claim 2, characterized in that: The top of the reinforcing seat (1) is provided with a plurality of limiting holes (13), and a vertical rod (14) is slidably connected in each limiting hole (13), and the top ends of the plurality of vertical rods (14) are respectively fixed to the bottom ends of the corresponding top rods (12).

4. The diamond composite drill bit for drilling according to claim 1, characterized in that: A guide ring groove (15) is provided at the bottom of the reinforcement seat (1), a reinforcement ring (16) is slidably connected in the guide ring groove (15), and a reinforcement mounting plate (17) is fixedly provided at the bottom end of the reinforcement ring (16).

5. The diamond composite drill bit for drilling according to claim 4, characterized in that: An inner thread cylinder (18) is fixedly provided on the reinforcing mounting plate (17), a screw rod (19) is threadedly connected to the middle portion of the inner thread cylinder (18), the screw rod (19) is located in the inner embedded hole (2), and the top end of the screw rod (19) is fixedly provided on the tray (3).

6. The diamond composite drill bit for drilling according to claim 4, characterized in that: A plurality of limiting holes (20) are provided starting from the middle of the guide ring groove (15), and each of the limiting holes (20) is located on the bottom surface of the reinforcement seat (1). A plurality of locking rods (21) are provided on the reinforcement mounting plate (17), and each of the locking rods (21) extends into the corresponding limiting hole (20).

7. The diamond composite drill bit for drilling according to claim 4, characterized in that: A main shaft (22) is provided on a side of the reinforcing mounting plate (17) away from the reinforcing seat (1), the main shaft (22) is fixed on the reinforcing mounting plate (17), and the main shaft (22) and the tray (3) are in the same axial direction.

8. The diamond composite drill bit for drilling according to claim 1, characterized in that: The bottom end of the reinforcement oblique rod (10) is fixed on the reinforcement seat (1) at an angle downward, and the vertical cross-section of the plurality of reinforcement oblique rods (10) and the diamond composite drilling block (7) is combined into a truncated cone shape.

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