Polycrystalline diamond compact anchor bit

Abstract

The present application relates to the technical field of drill bits, in particular to a polycrystalline diamond compact anchor rod drill bit, which utilizes a blade tip and polycrystalline diamond compact arranged on the blade surface, both of which can work together to improve drilling efficiency; the water tank is slidably arranged in the water tank cavity and is driven by the lifting mechanism to move up and down, so that the impact water hole is hidden in the water tank cavity or leaks outside; when water flushing is needed, the water tank is slid upward, which can prevent debris from entering the impact water hole and affecting the use effect of the impact water hole; while impacting the debris, the impact water hole can use the splashing water on the surface of the debris to cool the blade wing.

Description

Technical Field

[0001] This invention relates to the field of drill bit technology, specifically to polycrystalline diamond composite anchor drill bits. Background Technology

[0002] Polycrystalline diamond composite drill bits feature high wear resistance, high impact resistance, anti-deviation, anti-mud-packing, and high rotational speed. In drilling applications, the use of polycrystalline diamond composite drill bits can significantly reduce oilfield extraction costs, accelerate extraction speed, and improve the economic efficiency of oilfields. Drill bits typically have water outlets to cool the drill teeth and flush away debris that has entered the tooth gaps. However, existing water outlets are usually exposed on the outside of the drill bit. During drill bit insertion / removal or well bottom cleaning, if water is not flowing from the water outlets, debris may become stuck inside. Some debris can be dislodged by the water after it emerges, but if the debris is stuck firmly or in an extreme position, the water cannot dislodge it, thus clogging the water outlets and significantly affecting the water output. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a polycrystalline diamond composite anchor drill bit.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a polycrystalline diamond composite anchor drill bit, comprising a connector, a base above the connector, and a plurality of circumferentially arranged cutting wings above the base, each cutting wing having a plurality of polycrystalline diamond composite sheets; a mounting cavity is provided at the center of the base, and an internal block is provided within the mounting cavity; the internal block has a plurality of circumferentially arranged water trough cavities, and water troughs are vertically slidably connected within the water trough cavities; impact water holes are provided on the outer surface of the water troughs; a plurality of The water tank can slide relative to the water tank cavity via a lifting mechanism, allowing the impact water holes to be concealed within or exposed outside the water tank cavity. An inner cavity communicating with the water tank cavity is located below the built-in block, and the lifting mechanism is housed within this inner cavity. A rigid connecting pipe connects to the bottom of the water tank, and the lifting mechanism is fixed to the rigid connecting pipe. A water cavity is provided within the connector, and a flexible connecting pipe is located below the rigid connecting pipe, communicating with the water cavity.

[0005] The lifting mechanism includes a motor fixed inside the cavity, a lead screw connected to the output shaft of the motor, a nut on the lead screw, a linkage plate fixed to the outer periphery of the nut, and several rigid connecting pipes fixed to the linkage plate.

[0006] The motor is a battery-powered motor, meaning that the motor is powered by a battery.

[0007] The lower side of the built-in block is provided with an end cap connecting cavity, the upper part of the end cap connecting cavity is connected to the inner cavity, and an end cap is detachably connected inside the end cap connecting cavity.

[0008] The top surface of the blade wing gradually bulges from the side towards the center to form a blade tip, such that the blade tip includes a blade tip and blade surfaces located on both sides of the blade tip; several polycrystalline diamond composite sheets are distributed on each blade surface;

[0009] The end cap is threadedly connected to the end cap connecting cavity; a disassembly tool connecting groove is recessed below the end cap, the disassembly tool connecting groove is at least triangular in structure, and the battery of the battery motor is rotatably connected to the end cap.

[0010] Furthermore, a plurality of water delivery channels are provided on the lower side of the built-in block below the inner cavity, and the bottom ends of the plurality of water delivery channels are connected to the water cavity. The positions of the plurality of water delivery channels correspond one-to-one with the positions of the plurality of flexible connecting pipes and are connected.

[0011] Furthermore, a first annular sealing ring is provided below the end cap, the outer diameter of the first sealing ring being larger than the diameter of the end cap; a second sealing ring is integrally formed on the side of the first sealing ring near the end cap, the inner diameter of the second sealing ring also being larger than the diameter of the end cap; a sealing groove for accommodating the second sealing ring is provided at the bottom of the built-in block at a position corresponding to the second sealing ring; when the end cap is connected to the end cap connecting cavity, the second sealing ring is exactly located in the sealing groove.

[0012] Furthermore, the number of water tanks is half the number of blades, and each water tank is provided with two impact water holes, with the two impact water holes on each water tank facing the left and right sides of the same blade respectively.

[0013] Furthermore, the top surface of the built-in block has a smooth dome-shaped structure, causing the edges of the built-in block to gradually protrude upwards towards the center.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The polycrystalline diamond composite anchor drill bit provided by the present invention utilizes the cutting edge and the polycrystalline diamond composite sheet set on the cutting edge surface, which can work together to improve drilling efficiency; by sliding the water tank in the water tank cavity and driving the water tank up and down through the lifting mechanism, the impact water hole can be hidden in the water tank cavity or exposed. When water needs to be flushed, the water tank can be slid upward to prevent debris from entering the impact water hole and affecting the use effect of the impact water hole. While impacting debris, the impact water hole can use the water splashed after the water impacts the surface of the debris to cool the cutting edge. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the isometric structure of the present invention;

[0016] Figure 2 This is a top view of the structure of the present invention;

[0017] Figure 3 For along Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0018] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0019] Figure 5 This is a frontal perspective view of the structure of the present invention;

[0020] Figure 6 For along Figure 5 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0021] Figure 7 This is a schematic diagram of the isometric structure of the present invention (with the built-in block removed). Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below 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. For those skilled in the art, the specific meaning of the terms in the present invention can be understood according to the specific circumstances.

[0023] The polycrystalline diamond composite anchor drill bit provided by the present invention mainly includes a connector 1, a base 2 fixed to the connector 1, and a number of blades 3 on the base 2. The blades 3 are arranged in a circumferential array on the base 2, and a number of polycrystalline diamond composite sheets 4 are distributed on each blade 3.

[0024] A mounting cavity 5 is located at the center of the base 2. An internal block 6 is located within the mounting cavity 5, and several water tanks 7 are mounted on the internal block 6. Impact water holes 8 are formed on the outer surface of the water tanks 7, all facing outwards. This ensures that the extension axis of the impact water holes 8 is located between two adjacent sets of cutting blades 3, washing away debris or dirt accumulated between adjacent cutting blades 3 to prevent its accumulation from affecting the drill bit's performance. Simultaneously, it cools the cutting blades 3, preventing the drill bit from overheating. A rigid connecting pipe 9 is connected to the bottom of the water tank 7. A water cavity 10 is formed inside the connector 1, connected to the rigid connecting pipe 9. This allows external water to enter the water cavity 10 through the drill rod (not shown in the figure) when the connector 1 is connected to the drill rod, and then enters the water tank 7 through the rigid connecting pipe 9. The water is then discharged through the impact water holes 8 on the water tank 7, impacting and washing away debris and cooling the cutting blades.

[0025] In this invention, a water tank cavity 11 is formed on the built-in block 6 at a position corresponding to the water tank 7. The shape of the water tank cavity 11 matches that of the water tank 7, and the water tank 7 is vertically slidably disposed within the water tank cavity 11. Several water tanks 7 are driven to slide up and down relative to the water tank cavity 11 by a lifting mechanism, so that the impact water holes 8 located on the outer side of the water tank 7 can be hidden inside the water tank cavity 11 to protect the impact water holes 8 and prevent debris or dirt from entering the interior of the impact water holes 8, or the impact water holes 8 can be exposed to the outside of the water tank cavity 11 so that the impact water holes 8 can realize the flushing function.

[0026] The interior of the built-in block 6 is provided with an inner cavity 12 located below the water tank cavity 11. The inner cavity 12 is connected to the water tank cavity 11, and the lifting mechanism is located inside the inner cavity 12.

[0027] The lifting mechanism includes a motor 13 fixed inside the inner cavity 12. The motor 13 is a battery-powered motor powered by a battery 14. The battery 14 and the motor 13 are connected by a cable. Battery power avoids the difficulty of underground drilling cable transmission. The battery 13 of the battery motor is replaceable, and when the power is depleted, the battery 14 can be replaced to ensure sufficient power. A lead screw 15 is driven onto the output shaft of the motor 13, and the top end of the lead screw 15 is rotatably connected to the top surface of the inner cavity 12. A lead screw 15 is rotatably connected to a lead screw nut 16 that cooperates with the lead screw. A linkage disk 17 is fixed on the outer periphery of the lead screw nut 16. Several connecting ears 18 are evenly distributed in a circular array on the outer periphery of the linkage disk 17. The positions of several connecting ears 18 correspond one-to-one with several rigid connecting tubes 9. Each connecting ear 18 is fixed to its corresponding rigid connecting tube 9. When the motor 13 drives the lead screw nut 16 to move, the lead screw nut 16 drives the rigid connecting tube 9 and the water tank 7 to move up and down through the linkage disk 17 and the connecting ears 18, so that the water tank 7 rises and falls relative to the built-in block 6.

[0028] Several vertically penetrating water channels 10 are provided on the lower side of the built-in block 6, below the inner cavity 12. The bottom ends of several water channels 19 are connected to the water cavity 10. The positions of several water channels 19 correspond one-to-one with several rigid connecting pipes 9, and a flexible connecting pipe 20 is connected between the lower end of the rigid connecting pipe 9 and the upper end of the water channel 19. The flexible connecting pipe 20 is located inside the inner cavity 12. The flexible connecting pipe 20 can be a retractable corrugated hose or a flexible hose, and the length of the flexible hose is greater than the distance between the rigid connecting pipe 9 and the water channel 19 to ensure that the flexible hose can provide sufficient upward distance for the vertical movement of the water tank 7.

[0029] An end cap connecting cavity 21 is provided on the lower side of the built-in block 6. The upper part of the end cap connecting cavity 21 is connected to the inner cavity 12, and an end cap 22 is connected inside the end cap connecting cavity 21, making the end cap 22 detachable. The battery 14 of the battery motor is fixed to the top of the end cap 22. When the battery 14 needs to be replaced, the battery 14 can be removed by simply removing the end cap 22. End cap 22 can be snapped into end cap connecting cavity 21, or, as another alternative implementation, end cap 22 can be threaded into end cap connecting cavity 21. For easy disassembly, a disassembly tool connecting groove 23 is provided in the lower part of end cap 22. The disassembly tool connecting groove 23 is at least triangular in structure so that after the disassembly tool (not shown in the figure) is inserted into the disassembly tool connecting groove 23, the end cap 22 can be rotated to achieve disassembly. In this connection method, the battery 14 of the battery motor is preferably rotatably connected to end cap 22 to avoid the cable used to connect battery 14 and motor 13 from kinking when rotating end cap 22.

[0030] A first annular sealing ring 24 is fixedly provided below the end cover 22. The outer diameter of the first sealing ring 24 is larger than the diameter of the end cover 22. A second sealing ring 25 is integrally formed on the side of the first sealing ring 24 near the end cover 22. The inner diameter of the second sealing ring 25 is also larger than the diameter of the end cover 22. A sealing groove 26 for accommodating the second sealing ring 25 is provided at the bottom of the built-in block 6 at a position corresponding to the second sealing ring 25. The second sealing ring 25 is located in the sealing groove 26. When the end cover 33 is connected to the end cover connecting cavity 21, the second sealing ring 25 can just enter the sealing groove 25 to seal the connection of the end cover 22 and prevent water in the water cavity 10 from entering the inner cavity 12 through the gap of the end cover 22, thus affecting the use of the motor 13.

[0031] In this invention, the built-in block 6 and the base 2 are also detachably connected. The connection method can be threaded. In this embodiment, the two are connected by screws. Several interconnected screw slots 27 are provided at corresponding positions of the built-in block 6 and the base 2. The central axis of the screw slot 27 is perpendicular to the central axis of the base 2. Screws 28 are connected in the screw slots 27, so that the built-in block 6 and the base 2 are detachably connected.

[0032] The top surface of the cutter wing 3 gradually bulges upward from the side towards the center to form a cutting edge, which has a cutting edge 29 and two inclined and symmetrical cutting edges 30. The direction of the cutting edge 29 is consistent with the radial direction of the base 2. Polycrystalline diamond composite sheets 4 are distributed on the cutting edges 30. The top height of the polycrystalline diamond composite sheets 4 on the two cutting edges 30 on the same cutter wing 3 is no higher than the top height of the cutting edge 29. Therefore, when the drill bit is working, both the polycrystalline diamond composite sheets 4 and the cutting edge 29 can play their full role.

[0033] In this invention, the top surface of the built-in block 6 has a smooth dome-shaped structure, so that the edge of the built-in block 6 gradually protrudes upward towards the center, avoiding the accumulation of debris and soil.

[0034] Each water tank 7 has two impact water holes 8 symmetrically distributed. In order to enable the impact water holes 8 to effectively clean the debris and dirt between adjacent blades 3, the number of water tanks 7 is 1 / 2 of the number of blades 3. That is, if there are 7 water tanks, then there are 14 blades 3. The two impact water holes 8 on each water tank 7 face the left and right sides of the same blade 3 respectively.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A polycrystalline diamond composite anchor drill bit, characterized in that: The device includes a connector, a base above the connector, and several circularly arranged blades above the base, each blade having several polycrystalline diamond composite sheets. A mounting cavity is located at the center of the base, containing an internal block. The internal block has several circularly arranged water tank cavities, each with a vertically slidable water tank. Impact water holes are formed on the outer surface of each water tank. Several water tanks can slide relative to the water tank cavities via a lifting mechanism, allowing the impact water holes to be concealed within or exposed outside the water tank cavities. An inner cavity communicating with the water tank cavities is located below the internal cavity within the internal block, and the lifting mechanism is located within this inner cavity. A rigid connecting pipe connects to the bottom of each water tank, and the lifting mechanism is fixed to the rigid connecting pipe. A water cavity is located within the connector, and a flexible connecting pipe is located below the rigid connecting pipe, communicating with the water cavity. The lifting mechanism includes a motor fixed inside the inner cavity, a lead screw connected to the output shaft of the motor, a nut on the lead screw, a linkage plate fixed to the outer periphery of the nut, and several rigid connecting pipes fixed to the linkage plate. The motor is a battery-powered motor, meaning that the motor is powered by a battery. The lower side of the built-in block is provided with an end cap connecting cavity, the upper part of the end cap connecting cavity is connected to the inner cavity, and an end cap is detachably connected inside the end cap connecting cavity. The top surface of the blade wing gradually bulges from the side towards the center to form a blade tip, such that the blade tip includes a blade tip and blade surfaces located on both sides of the blade tip; several polycrystalline diamond composite sheets are distributed on each blade surface; The end cap is threadedly connected to the end cap connecting cavity; a disassembly tool connecting groove is recessed below the end cap, the disassembly tool connecting groove is at least triangular in structure, and the battery of the battery motor is rotatably connected to the end cap.

2. The polycrystalline diamond composite anchor drill bit according to claim 1, characterized in that: Several water delivery channels are provided on the lower side of the built-in block below the inner cavity, and the bottom ends of the several water delivery channels are connected to the water cavity. The positions of the several water delivery channels correspond one-to-one with the positions of several flexible connecting pipes and are connected.

3. The polycrystalline diamond composite anchor drill bit according to claim 1, characterized in that: A first annular sealing ring is provided below the end cap, the outer diameter of the first sealing ring being larger than the diameter of the end cap; a second sealing ring is integrally formed on the side of the first sealing ring near the end cap, the inner diameter of the second sealing ring also being larger than the diameter of the end cap; a sealing groove for accommodating the second sealing ring is provided at the bottom of the built-in block at a position corresponding to the second sealing ring; when the end cap is connected to the end cap connecting cavity, the second sealing ring is exactly located in the sealing groove.

4. The polycrystalline diamond composite anchor drill bit according to claim 1, characterized in that: The number of water tanks is half the number of blades, and each water tank is provided with two impact water holes, with the two impact water holes on each water tank facing the left and right sides of the same blade respectively.

5. The polycrystalline diamond composite anchor drill bit according to claim 1, characterized in that: The top surface of the built-in block has a smooth dome-shaped structure, causing the edges of the built-in block to gradually protrude upwards towards the center.

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