A PDC bit having a dual flow channel structure

Abstract

The present application relates to the technical field of drilling equipment, and discloses a PDC drill bit with a double-flow channel structure, which comprises a drill bit body, the upper outer wall of the drill bit body is provided with an isolation assembly, the isolation assembly comprises a first isolation vane, the outer wall of the first isolation vane is fixed to the outer wall of the drill bit body, the inner wall of the drill bit body is fixed with a first flow guide pressure stabilizing column, the inner wall of the drill bit body is slidably provided with a push piece, the center of the push piece is provided with a first one-way valve, the outer wall of the connecting pipe is provided with an elastic liquid storage bag, the outer wall of the elastic liquid storage bag is arranged on the inner wall of the drill bit body, and the upper surface of the elastic liquid storage bag is fixedly connected with a liquid outlet assembly. The drill bit body is connected with a drill string, at this time, the drill string and the drill bit body rotate synchronously, the elastic liquid storage bag can store liquid, the liquid can be discharged at a continuous and stable pressure, impurities can be prevented from accumulating near the drill bit body, and the drilling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of drilling and production equipment technology, specifically to a PDC drill bit with a dual-flow channel structure. Background Technology

[0002] Drill bits are tools used in drilling operations to break rocks and create wellbores. Commonly used drill bits in drilling operations include tricone bits, PDC bits, and tricone-PDC composite bits. Among these, PDC bits are the most commonly used drilling tool in oil drilling operations.

[0003] PDC drill bits are a type of cutting drill bit made by embedding polycrystalline diamond composite (PCD) sheets into the drill bit body. They use the PCD sheets as the cutting edge and break rocks using a negative rake angle shearing method. Existing PDC drill bits are all wing-type bits, with several wings distributed circumferentially on the drill bit body, and PDC cutting teeth welded onto the wings. A chip removal channel is formed between adjacent wings. During drilling, if lifted rock cuttings fall into the well, they can easily get stuck in the chip removal channel, affecting the lifting and removal of rock cuttings, and consequently impacting the drill bit's rock-breaking efficiency.

[0004] In related technologies, as the drilling depth increases, the distance between the PDC drill bit and the ground increases. As a result, the drilling fluid delivery pressure cannot be maintained at a constant pressure, leading to the accumulation of cuttings and impurities in the drill bit's flow channels and cutting areas, thus reducing the drill bit's drilling efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a PDC drill bit with a dual-channel structure, which solves the problem in related technologies where, as the PDC drill bit moves away from the ground, the drilling fluid delivery pressure cannot be output at a constant pressure, causing impurities to accumulate near the drill bit and thus reducing drilling efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a PDC drill bit with a dual-channel structure, comprising a drill bit body, an isolation component disposed on the upper outer wall of the drill bit body, the isolation component comprising a first isolation blade, the outer wall of the first isolation blade being fixed to the outer wall of the drill bit body, a first flow guiding and pressure stabilizing column being fixed to the inner wall of the drill bit body, a pusher plate slidingly disposed on the inner wall of the drill bit body, a first elastic element being fixed between the lower surface of the pusher plate and the inner wall of the drill bit body, a first one-way valve being disposed at the center of the pusher plate, a connecting pipe being fixed to the upper surface of the pusher plate, an elastic liquid reservoir being disposed on the outer wall of the connecting pipe, the outer wall of the elastic liquid reservoir being disposed on the inner wall of the drill bit body, and a liquid outlet component being disposed on the upper surface of the elastic liquid reservoir.

[0007] Preferably, the liquid outlet assembly includes a fixing plate, the outer wall of which is fixedly connected to the inner wall of the drill bit body. The inner wall of the fixing plate has multiple sets of through holes, and the inner wall of the through holes of the fixing plate is fixedly connected to a second flow guiding and pressure stabilizing column. The inner wall of the second flow guiding and pressure stabilizing column is in communication with the inner wall of the elastic liquid storage bladder.

[0008] Preferably, a fixing ring is slidably connected to the inner wall of the fixing plate, a second elastic element is fixedly connected between the upper surface of the fixing ring and the inner wall of the drill bit body, and a top column is fixedly connected to the inner wall of the fixing ring.

[0009] Preferably, the inner wall of the top post is provided with a second one-way valve, the outer wall of the top post is slidably connected to the inner wall of the drill bit body, and the inner wall of the drill bit body is provided with a first elastic closing valve plate.

[0010] Preferably, the upper surface of the pusher is provided with a cleaning component, the cleaning component including a retaining post, the lower surface of the retaining post being fixedly connected to the upper surface of the pusher, and the outer wall of the retaining post being slidably connected to the inner wall of the drill bit body.

[0011] Preferably, a push rod is slidably connected to the outer wall of the chuck, and the outer wall of the push rod is slidably connected to the inner wall of the drill bit body.

[0012] Preferably, the outer wall of the push rod is slidably connected to a second isolation blade, and the outer wall of the second isolation blade is rotatably connected to the inner wall of the drill bit body.

[0013] Preferably, a T-shaped block is fixedly connected to the upper surface of the push rod, a top rod is fixedly connected to the inner wall of the T-shaped block, and the inner wall of the top rod communicates with the inner wall of the elastic reservoir. A guide ring is fixedly connected to the outer wall of the top rod, and the guide ring and the outer wall of the top rod are slidably connected to the inner wall of the drill bit body.

[0014] Preferably, a third elastic element is fixedly connected between the outer wall of the top rod and the inner wall of the drill bit body, and a second elastic closing valve plate is fixedly connected to the inner wall of the drill bit body.

[0015] Preferably, a third flow guiding and pressure stabilizing column is fixedly connected to the inner wall of the push rod, a third one-way valve is fixedly connected to the inner wall of the push rod, and a hollow column is fixedly connected to the inner wall of the push rod.

[0016] Working principle: When the drill bit body is installed on the drill string for rock breaking, the liquid enters the drill bit body through the drill string. The inner wall of the drill bit body is equipped with a first flow guiding and pressure stabilizing column, which stabilizes the pressure of the liquid. After the liquid enters the drill bit body, it pushes the pusher plate to slide against the inner wall of the drill bit body. The pusher plate pushes the connecting pipe to slide, and at the same time, it causes the elastic reservoir to compress synchronously. When the first flow guiding and pressure stabilizing column stably discharges the liquid, the upper surface of the pusher plate will fit against the inner wall of the drill bit body, thereby allowing the connecting pipe to stably squeeze the elastic reservoir. The liquid then enters the inner wall of the connecting pipe through the first one-way valve installed on the inner wall of the pusher plate, and thus enters the interior of the elastic reservoir. The elastic reservoir then discharges the liquid to the outside of the drill bit body through the liquid outlet component. Since the outer wall of the drill bit body is equipped with a first isolation blade, an internal flow channel is formed between one side of the outer wall of the first isolation blade and the outer wall of the drill bit body, while the other side of the outer wall of the first isolation blade is the external flow channel.

[0017] This invention provides a PDC drill bit with a dual-flow channel structure. It has the following beneficial effects: 1. This invention connects the drill bit body to the drill string, where the drill string and drill bit body rotate synchronously. The flow channel inside the drill string delivers drilling fluid into the drill bit body. The fluid is then stabilized by the first flow-guiding and pressure-stabilizing column, which pushes the pusher and connecting pipe to slide synchronously. After the pusher slides to the appropriate position, the first one-way valve opens, allowing the fluid to be discharged through the elastic reservoir and the discharge assembly. The first isolation blade installed on the outer wall of the drill bit body can discharge impurities. The first flow-guiding and pressure-stabilizing column allows the fluid to be discharged stably, while the elastic reservoir can store the fluid, enabling the fluid to be discharged at a continuous and stable pressure. This prevents impurities from accumulating near the drill bit body, thereby improving drilling efficiency.

[0018] 2. This invention utilizes the sliding of the push plate and connecting tube to compress the elastic reservoir, allowing the liquid inside the reservoir to be discharged through the second flow-guiding and pressure-stabilizing column into the fixed plate and the drill bit body. The liquid entering the drill bit body pushes the fixed ring to slide, which in turn opens the first elastic closing valve, allowing the liquid to be discharged through the second one-way valve and the top column. The second and first flow-guiding and pressure-stabilizing columns work together to stabilize the liquid discharge pressure. When the pressure is insufficient, the first elastic element drives the connecting tube and push plate to repeatedly push and pull the elastic reservoir, while the second elastic element pulls the top column back to its original position, closing the first elastic closing valve. This allows the liquid to be discharged at a stable pressure. Furthermore, when the pressure is insufficient, the top column retracts to prevent backflow and effectively block the top column.

[0019] 3. This invention expands the elastic reservoir, causing it to push the T-shaped block to slide. The T-shaped block then drives the push rod to slide synchronously. At this time, the push rod drives the guide ring to compress the third elastic element, and simultaneously pushes open the second elastic closing valve plate, allowing the liquid to be discharged through the third one-way valve and stabilized by the third flow guiding and pressure stabilizing column. Through the cooperation of the hollow column and the liquid discharge assembly, the effect of dual-channel liquid discharge can be achieved.

[0020] 4. This invention uses an elastic reservoir to push the T-shaped block to slide, thereby allowing the T-shaped block to slide synchronously. While the push rod slides, it pushes the second isolation blade to rotate on the inner wall of the drill bit body. Since the upper side of the second isolation blade is in contact with the outer wall of the drill bit body, and the push rod discharges liquid, the second isolation blade can switch from dual-channel impurity discharge to single-channel impurity discharge. Moreover, the hollow column prevents impurities from accumulating. When the T-shaped block resets and the liquid discharge assembly discharges liquid, the push rod pulls the second isolation blade to switch to dual-channel impurity discharge. At the same time, the locking column locks the push rod, which can prevent the second isolation blade from falling off. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the connecting pipe structure of the present invention; Figure 3 This is a schematic diagram of the fixing plate structure of the present invention; Figure 4 This is a schematic diagram of the top column structure of the present invention; Figure 5 This is a schematic diagram of the first elastic element structure of the present invention; Figure 6 This is a schematic diagram of the pusher structure of the present invention; Figure 7 This is a schematic diagram of the push rod structure of the present invention; Figure 8 This is a schematic diagram of the push rod structure of the present invention; Figure 9 This is a schematic diagram of the hollow column structure of the present invention.

[0022] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0023] The components include: 1. Drill bit body; 2. Isolation assembly; 21. First isolation blade; 22. Second isolation blade; 3. First flow guiding and pressure stabilizing column; 4. First elastic element; 5. Push plate; 6. Connecting pipe; 7. Elastic reservoir; 8. Discharge assembly; 81. Fixing plate; 82. Second flow guiding and pressure stabilizing column; 83. Top column; 84. First elastic closing valve plate; 85. Second one-way valve; 86. Fixing ring; 87. Second elastic element; 9. Cleaning assembly; 901. Clamping post; 902. Push rod; 903. T-block; 904. Third one-way valve; 905. Top rod; 906. Guide ring; 907. Second elastic closing valve plate; 908. Third flow guiding and pressure stabilizing column; 909. Third elastic element; 910. Hollow column. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1: Please refer to the appendix. Figure 1 and attached Figure 2 This invention provides a PDC drill bit with a dual-channel structure, including a drill bit body 1. An isolation component 2 is provided on the upper outer wall of the drill bit body 1. The isolation component 2 includes a first isolation blade 21. The outer wall of the first isolation blade 21 is fixed to the outer wall of the drill bit body 1. A first flow guiding and pressure stabilizing column 3 is fixed on the inner wall of the drill bit body 1. A pusher 5 slides on the inner wall of the drill bit body 1. A first elastic element 4 is fixed between the lower surface of the pusher 5 and the inner wall of the drill bit body 1. A first one-way valve is provided at the center of the pusher 5. A connecting pipe 6 is fixed on the upper surface of the pusher 5. An elastic liquid storage bladder 7 is provided on the outer wall of the connecting pipe 6. The outer wall of the elastic liquid storage bladder 7 is provided on the inner wall of the drill bit body 1. A liquid outlet component 8 is provided on the upper surface of the elastic liquid storage bladder 7.

[0026] Specifically, when using the drill bit body 1, it is installed on the drill string for rock breaking. At this time, the liquid enters the inner wall of the drill bit body 1 through the one-way channel of the drill string. A first flow-guiding and pressure-stabilizing column 3 is installed on the inner wall of the drill bit body 1, stabilizing the pressure of the liquid. After entering the drill bit body 1 through the first flow-guiding and pressure-stabilizing column 3, the liquid pushes the pusher plate 5 to slide against the inner wall of the drill bit body 1. The sliding of the pusher plate 5 pulls the first elastic element 4 to extend synchronously. Simultaneously, the pusher plate 5 pushes the connecting pipe 6 to slide, causing the elastic reservoir 7 to slide synchronously. The connecting pipe 6 is made of a rigid material, thus stably pushing and compressing the elastic reservoir 7. Furthermore, the reciprocating sliding of the first elastic element 4 in conjunction with the pusher plate 5 allows the connecting pipe 6 to push and pull the elastic reservoir 7 synchronously, enabling the elastic reservoir... The bladder 7 achieves a stable discharge effect. When the first guide and pressure stabilizing column 3 stably discharges liquid, the upper surface of the pusher 5 will adhere to the inner wall of the drill bit body 1, thereby allowing the connecting pipe 6 to stably squeeze the elastic liquid storage bladder 7. Due to the limitation of the pusher 5 by the drill bit body 1, the liquid enters the inner wall of the connecting pipe 6 through the first one-way valve installed on the inner wall of the pusher 5, thereby allowing the liquid to enter the interior of the elastic liquid storage bladder 7. The elastic liquid storage bladder 7 will discharge the liquid to the outside of the drill bit body 1 through the liquid discharge assembly 8. Since the outer wall of the drill bit body 1 is equipped with the first isolation blade 21, and the two outer walls of the first isolation blade 21 are completely fixed to the outer wall of the drill bit body 1, an inner flow channel is formed between one outer wall of the first isolation blade 21 and the outer wall of the drill bit body 1, while the other outer wall of the first isolation blade 21 is the outer flow channel. The drill bit body 1 is existing technology and will not be described in detail here.

[0027] Please see the appendix Figure 2 - Appendix Figure 4 The liquid outlet assembly 8 includes a fixing plate 81. The outer wall of the fixing plate 81 is fixedly connected to the inner wall of the drill bit body 1. The inner wall of the fixing plate 81 has multiple sets of through holes. The inner wall of the through holes of the fixing plate 81 is fixedly connected to a second flow guiding and pressure stabilizing column 82. The inner wall of the second flow guiding and pressure stabilizing column 82 is connected to the inner wall of the elastic liquid storage bladder 7. The inner wall of the fixing plate 81 is slidably connected to a fixing ring 86. The upper surface of the fixing ring 86 is fixedly connected to the inner wall of the drill bit body 1 with a second elastic element 87. The inner wall of the fixing ring 86 is fixedly connected to a top column 83. The inner wall of the top column 83 is provided with a second one-way valve 85. The outer wall of the top column 83 is slidably connected to the inner wall of the drill bit body 1. The inner wall of the drill bit body 1 is provided with a first elastic closing valve plate 84.

[0028] Specifically, when liquid enters the elastic reservoir 7, the elastic reservoir 7 discharges liquid into the inner wall of the fixed plate 81 and the drill bit body 1. At this time, the liquid enters the inner wall of the drill bit body 1 through the second flow guiding and pressure stabilizing column 82 installed on the inner wall of the fixed plate 81. At this time, the liquid pushes the lower surface of the fixed ring 86 to slide, so that the liquid drives the fixed ring 86 and the top column 83 to slide synchronously on the inner wall of the drill bit body 1. When the fixed ring 86 slides, it will compress the second elastic element 87, and the sliding of the top column 83 will push open the first elastic closing valve plate 84, allowing the top column 83 to extend. At the same time, the liquid will enter the interior of the top column 83 through the second one-way valve 85, so that the liquid is discharged to the outside of the drill bit through the top column 83. By installing multiple sets of top columns 83 on the inner wall of the drill bit body 1, the drill bit body 1 will evenly discharge liquid to the outer wall of the drill bit body 1 during rotation. This allows the liquid to carry impurities out from the inner and outer channels of the first isolation blade 21. When impurities and liquid cannot be discharged through the first isolation blade 21, they will accumulate at the top of the drill bit body 1. At this time, the liquid cannot be discharged from the elastic reservoir 7, the second flow guiding and stabilizing column 82 and the top column 83. Instead, the liquid will be stored in the elastic reservoir 7, causing the elastic reservoir 7 to expand. When the external pressure of the elastic reservoir 7 is balanced with that of the drill bit body 1, the second elastic element 87 will push the fixing ring 86 and the top column 83 to reset, thereby causing the first elastic closing valve plate 84 to close again, which can prevent the backflow of liquid outside the drill bit body 1.

[0029] Example 2: Please refer to the appendix. Figure 5 - Appendix Figure 9 The upper surface of the pusher plate 5 is provided with a cleaning component 9, which includes a retaining post 901. The lower surface of the retaining post 901 is fixedly connected to the upper surface of the pusher plate 5. The outer wall of the retaining post 901 is slidably connected to the inner wall of the drill bit body 1. A push rod 902 is slidably connected to the outer wall of the retaining post 901. The outer wall of the push rod 902 is slidably connected to the inner wall of the drill bit body 1. A second isolation blade 22 is slidably connected to the outer wall of the push rod 902. The outer wall of the second isolation blade 22 is rotatably connected to the inner wall of the drill bit body 1. A T-shaped block 903 is fixedly connected to the upper surface of the push rod 902. A top rod is fixedly connected to the inner wall of the T-shaped block 903. 905, and the inner wall of the push rod 905 is connected to the inner wall of the elastic reservoir 7. The outer wall of the push rod 905 is fixedly connected to a guide ring 906. The guide ring 906 and the outer wall of the push rod 905 are slidably connected to the inner wall of the drill bit body 1. A third elastic element 909 is fixedly connected between the outer wall of the push rod 905 and the inner wall of the drill bit body 1. A second elastic closing valve plate 907 is fixedly connected to the inner wall of the drill bit body 1. A third flow guiding and pressure stabilizing column 908 is fixedly connected to the inner wall of the push rod 905. A third one-way valve 904 is fixedly connected to the inner wall of the push rod 905. A hollow column 910 is fixedly connected to the inner wall of the push rod 905.

[0030] Specifically, when the elastic reservoir 7 expands, it pushes the connecting pipe 6 to slide, and the first elastic element 4 pulls the push plate 5 and the connecting pipe 6 to reset synchronously. After the lower surface of the push plate 5 is in contact with the inner wall of the drill bit body 1, the liquid will continue to supply liquid to the inside of the elastic reservoir 7 through the first one-way valve installed on the inner wall of the push plate 5. Because the elastic reservoir 7 expands, the liquid discharge component 8 can no longer discharge liquid, and the push plate 5 will pull the chuck 901 to slide synchronously. At this time, the elastic reservoir 7 will push the T-block 903 to slide, and the T-block 903 is connected to the push rod 902 and the top rod 905, so that the elastic reservoir 7 drives the push rod 902 and the top rod 905 to slide synchronously on the inner wall of the drill bit body 1. When push rod 902 slides, it pushes the second isolation vane 22 to rotate on the inner wall of the drill bit body 1, thus changing the second isolation vane 22 from a dual-channel to a single-channel design. This allows impurities of all sizes to be discharged from the outer wall of the second isolation vane 22, accelerating material discharge while preventing blockage. Furthermore, after the second isolation vane 22 rotates, push rod 905 pushes open the second elastic closing valve plate 907, allowing push rod 905 to exit the inner wall of the drill bit body 1. The sliding of the push rod 905 causes the guide ring 906 to slide, thereby compressing the third elastic element 909 and preparing for the push rod 905 to reset. After the push rod 905 is pushed out, the liquid inside the elastic reservoir 7 will enter the third flow-guiding and pressure-stabilizing column 908 through the third one-way valve 904, allowing the liquid to be discharged through the hollow column 910 at a stable pressure. After the push rod 905 discharges the liquid from the elastic reservoir 7, the pressure outside the drill bit body 1 and inside the elastic reservoir 7 decreases. At this time, the liquid pushes the pusher 5 and the connecting tube 6 to slide, causing the connecting tube 6 to compress the elastic reservoir 7, allowing the liquid inside the elastic reservoir 7 to be flushed out of the liquid assembly 8. Due to the reduced pressure in the elastic reservoir 7, the elastic reservoir 7 pulls the T-block 903 to reset, and the T-block 903 will drive the push rod 902 and the top rod 905 to reset synchronously, thereby allowing the push rod 902 to pull the second isolation blade 22 back to the dual flow channel. In the initial state, this structure uses multiple sets of structures in the liquid outlet assembly 8 to discharge liquid. When a blockage occurs, the liquid discharge component 8 is shut off and the cleaning component 9 accelerates the discharge and liquid output. After the blockage is resolved, the cleaning component 9 and the liquid discharge component 8 are opened simultaneously to discharge the liquid, achieving the effect of dual-channel discharge while preventing blockage. Moreover, after the T-block 903 is reset, the locking post 901 installed on the upper surface of the push plate 5 will fit against the inner wall of the push rod 902, thereby locking the push rod 902 and preventing the T-block 903 from causing the push rod 905 and the push rod 902 to slide. When push rod 902 resets, the second isolation vane 22 is in a dual-channel state. Because limit posts are fixed on both sides of the second isolation vane 22, the second isolation vane 22 drives the limit posts to rotate on the inner wall of the drill bit body 1. At this time, the outer wall of the second isolation vane 22 is not in contact with the outer wall of the drill bit body 1. When push rod 902 pushes, the inner wall of push rod 902 slides into contact with the inner wall of the second isolation vane 22. When the second isolation vane 22 presses against push rod 902, push rod 902 drives the second isolation vane 22 to rotate. As the second isolation vane 22 rotates along the axis of the limit posts, the upper outer wall of the second isolation vane 22 away from push rod 902 will contact the outer wall of the drill bit body 1, thus allowing impurities and liquid to flow along... The second isolating blade 22 is discharged through its arc-shaped outer wall, and the expansion and contraction of the elastic reservoir 7 pulls the push rod 905 to slide, thereby allowing the T-block 903 and the push rod 902 to slide synchronously. The third elastic element 909 also pushes the push rod 905 to slide synchronously. The main function of the locking post 901 is to lock the push rod 902 to prevent the liquid from being discharged through the push rod 905. When the upper side of the second isolating blade 22 is in contact with the outer wall of the drill bit body 1, the impurities drilled from the top of the drill bit body 1 can be discharged stably. The push rod 905 allows the liquid to flush between the outer wall of the second isolating blade 22 and the outer wall of the drill bit body 1, which can prevent accumulation and prevent the discharged impurities from re-entering the top of the drill bit body 1.

[0031] The workflow is as follows: First, the drill bit body 1 is installed on the drill string to perform rock breaking operations. At the same time, the drilling fluid enters the inner wall of the drill bit body 1 through the internal channel of the drill string. The drilling fluid first flows through the first flow guide and pressure stabilizing column 3 to stabilize the pressure before entering the inside of the drill bit body 1. The stabilized drilling fluid pushes the pusher plate 5 and the connecting pipe 6 to slide along the inner wall of the drill bit body 1. After the pusher plate 5 is limited and attached to the inner wall of the drill bit body 1, the drilling fluid enters the connecting pipe 6 through the first one-way valve in the pusher plate 5 and is then injected into the elastic reservoir 7. At this time, the drilling fluid in the elastic reservoir 7 is stabilized by the fixed plate 81 and the second flow guide and pressure stabilizing column 82, which pushes the fixed ring 86 and the top column 83 to slide and compress the second elastic element 87. After the top column 83 pushes open the first elastic closing valve plate 84 and extends, the drilling fluid enters the top column 83 through the second one-way valve 85 and is discharged outward. Multiple sets of top columns 83 distribute the fluid evenly as the drill bit rotates, and carry the cuttings out through the inner and outer double flow channels formed by the first isolation blade 21 to achieve normal cuttings removal. When impurities accumulate and block the flow channel, the discharge component 8 is obstructed from discharging fluid, and the drilling fluid accumulates in the elastic reservoir 7 and expands. At this time, the second elastic element 87 drives the fixed ring 86 and the top column 83 to reset, and the first elastic closing valve plate 84 closes to prevent liquid backflow. At the same time, the expansion of the elastic reservoir 7 pushes the T-block 903, the push rod 902 and the top rod 905 to slide. Meanwhile, the first elastic element 4 pulls the push plate 5 and the connecting pipe 6 to reset, and the push rod 902 pushes the second isolation blade 22 to rotate around the limit column, changing from a dual flow channel to a single flow channel, and the centralized channel quickly discharges slag and prevents blockage. The push rod 905 pushes open the second elastic closing valve plate 907 to extend, and the guide ring 906 compresses the third elastic element 909, so that the high pressure liquid in the elastic reservoir 7 enters the third flow-guiding and pressure-stabilizing column 908 through the third one-way valve 904, and is sprayed out directionally by the hollow column 910 to flush the gap between the second isolation blade 22 and the outer wall of the drill bit body 1 and remove accumulated impurities. After the blockage is cleared and the pressure drops, the drilling fluid pushes the pusher 5 and connecting pipe 6 again, compressing the elastic reservoir 7 to resume fluid discharge. The elastic reservoir 7 contracts and pulls the T-block 903, push rod 902 and top rod 905 to reset as a whole. The push rod 902 drives the second isolation blade 22 to switch to dual-channel state, the second elastic closing valve 907 closes, and the locking post 901 is locked into the inner wall of the push rod 902 to limit it, preventing abnormal sliding between the top rod 905 and the push rod 902. The drill bit resumes the dual-channel fluid discharge mode.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PDC drill bit with a dual-flow channel structure, comprising a drill bit body (1), characterized in that: An isolation component (2) is provided on the upper outer wall of the drill bit body (1). The isolation component (2) includes a first isolation blade (21). The outer wall of the first isolation blade (21) is fixed to the outer wall of the drill bit body (1). A first flow guiding and pressure stabilizing column (3) is fixed on the inner wall of the drill bit body (1). A pusher (5) slides on the inner wall of the drill bit body (1). A first elastic element (4) is fixed between the lower surface of the pusher (5) and the inner wall of the drill bit body (1). A first one-way valve is provided at the center of the pusher (5). A connecting pipe (6) is fixed on the upper surface of the pusher (5). An elastic reservoir (7) is provided on the outer wall of the connecting pipe (6). The outer wall of the elastic reservoir (7) is provided on the inner wall of the drill bit body (1). A liquid outlet component (8) is provided on the upper surface of the elastic reservoir (7).

2. The PDC drill bit with a dual-flow channel structure according to claim 1, characterized in that: The liquid outlet assembly (8) includes a fixing plate (81), the outer wall of which is fixedly connected to the inner wall of the drill bit body (1). The inner wall of the fixing plate (81) has multiple sets of through holes. The inner wall of the through holes of the fixing plate (81) is fixedly connected to a second flow guiding and pressure stabilizing column (82), and the inner wall of the second flow guiding and pressure stabilizing column (82) is connected to the inner wall of the elastic liquid storage bladder (7).

3. A PDC drill bit with a dual-flow channel structure according to claim 2, characterized in that: The inner wall of the fixing plate (81) is slidably connected to a fixing ring (86), and a second elastic element (87) is fixedly connected between the upper surface of the fixing ring (86) and the inner wall of the drill bit body (1). A top column (83) is fixedly connected to the inner wall of the fixing ring (86).

4. A PDC drill bit with a dual-flow channel structure according to claim 3, characterized in that: The inner wall of the top post (83) is provided with a second one-way valve (85), the outer wall of the top post (83) is slidably connected to the inner wall of the drill bit body (1), and the inner wall of the drill bit body (1) is provided with a first elastic closing valve plate (84).

5. A PDC drill bit with a dual-flow channel structure according to claim 1, characterized in that: The upper surface of the pusher (5) is provided with a cleaning component (9), which includes a locking post (901). The lower surface of the locking post (901) is fixedly connected to the upper surface of the pusher (5), and the outer wall of the locking post (901) is slidably connected to the inner wall of the drill bit body (1).

6. A PDC drill bit with a dual-flow channel structure according to claim 5, characterized in that: The outer wall of the locking post (901) is slidably connected to a push rod (902), and the outer wall of the push rod (902) is slidably connected to the inner wall of the drill bit body (1).

7. A PDC drill bit with a dual-flow channel structure according to claim 6, characterized in that: The outer wall of the push rod (902) is slidably connected to a second isolation blade (22), and the outer wall of the second isolation blade (22) is rotatably connected to the inner wall of the drill bit body (1).

8. A PDC drill bit with a dual-flow channel structure according to claim 7, characterized in that: A T-shaped block (903) is fixedly connected to the upper surface of the push rod (902). A top rod (905) is fixedly connected to the inner wall of the T-shaped block (903). The inner wall of the top rod (905) is connected to the inner wall of the elastic reservoir (7). A guide ring (906) is fixedly connected to the outer wall of the top rod (905). The guide ring (906) and the outer wall of the top rod (905) are slidably connected to the inner wall of the drill bit body (1).

9. A PDC drill bit with a dual-flow channel structure according to claim 8, characterized in that: A third elastic element (909) is fixedly connected between the outer wall of the top rod (905) and the inner wall of the drill bit body (1), and a second elastic closing valve plate (907) is fixedly connected to the inner wall of the drill bit body (1).

10. A PDC drill bit with a dual-flow channel structure according to claim 9, characterized in that: The inner wall of the push rod (905) is fixedly connected to a third flow guiding and pressure stabilizing column (908), the inner wall of the push rod (905) is fixedly connected to a third one-way valve (904), and the inner wall of the push rod (905) is fixedly connected to a hollow column (910).

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