A long-lasting screw drill

Abstract

Long-acting screw drill relates to deep sea oil drilling equipment technical field. The energy storage assembly includes a rack and an energy storage wheel, the rack is vertically fixed outside the barrel, the center of the energy storage wheel is provided with a shaft, the shaft is rotatably connected with two supporting arms, the two supporting arms are fixedly connected with a back plate, the back plate is connected with a drill bit body through bolts, one of the shafts of the energy storage wheel is wound with a torsional spring, one side of the torsional spring is fixedly connected with the energy storage wheel, and the other side of the torsional spring is fixedly connected with the supporting arm. The beneficial effects of the present application are: through the use of the pressure generated during drilling, the filter cartridge is lowered, the energy storage assembly stores and releases the compression energy of the compression spring A, the filter screen can be periodically shaken upward, the soil and rock debris that may enter the filter screen are thrown out, so that the water eye is not blocked by the soil and rock debris, the drilling operation is ensured to be carried out smoothly, and the use efficiency of the screw drill is improved.

Description

Technical Field

[0001] This invention relates to the field of deep-sea oil drilling equipment technology, and more particularly to a long-life screw drill bit. Shale gas extraction equipment. Background Technology

[0002] In shale gas extraction, screw drills are a commonly used piece of equipment. A screw drill is a volumetric oil and gas production device that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. When the mud pumped out by the mud pump flows through the bypass valve into the motor, a certain pressure difference is formed between the motor's inlet and outlet, driving the rotor to rotate around the stator's axis. The rotational speed and torque are then transmitted to the drill bit through the universal joint and drive shaft, thus achieving drilling operations.

[0003] The existing screw drilling technology has the following problems: When using existing screw drilling tools, the water holes in the drill bit are often blocked by mud, requiring cleaning of the water holes in the drill bit. However, when cleaning the water holes, the entire screw drilling tool needs to be stopped from drilling. For deep-sea oil drilling, the drill bit needs to be accurately and stably drilled into the preset position. Every time the drill bit is pulled out for cleaning, it needs to be repositioned. This not only reduces work efficiency but also increases the workload of the staff.

[0004] Publication No. CN 110410011 B discloses a screw drill bit with a feature to prevent clogging of the drill bit's water eye, comprising an internal thread drill bit water eye and an external thread slope soil-proofing net device. By rotating the slope fixing column in the external thread slope soil-proofing net device, the external thread connector is rotatably and fixedly connected to the internal thread drill bit water eye. This allows the external thread slope soil-proofing net device to prevent soil from entering the internal thread drill bit water eye, and it can simultaneously displace the soil. At the same time, it allows the internal thread drill bit water eye to be used continuously without the need for manual cleaning. However, although the external thread slope soil-proofing net device is installed, the drill bit water eye is still passively prevented from clogging, and the risk of clogging cannot be completely avoided. Summary of the Invention

[0005] To address the problem of existing screw drill bits frequently having their water holes clogged with mud, this invention provides a long-lasting screw drill.

[0006] The technical solution provided by the present invention is: a long-lasting screw drill bit, including a drill bit body, a cutting edge and a water eye on the upper part of the drill bit body, the number of the cutting edge and the water eye is three, the cutting edge and the water eye are arranged at intervals, the cutting edge and the water eye are evenly arranged along the central circumference of the drill bit body, and a filter component is provided in the water eye.

[0007] The filter assembly includes a filter cylinder installed inside a water eye. A filter screen is provided on the top plate of the filter cylinder. The water eye is machined with stepped holes A, B, and C from top to bottom, with the diameters of stepped holes A, B, and C decreasing sequentially. The filter cylinder consists of an upper stepped tube and a lower cylinder. The stepped tube is clearance-fitted with stepped hole A, and the cylinder is clearance-fitted with stepped hole C. A compression spring A is provided between the bottom surface of stepped hole A and the stepped tube. The drill bit body has a transverse groove at the step hole B position. An energy storage assembly is provided in the transverse groove. The energy storage assembly includes a rack and an energy storage wheel. The rack is vertically fixed on the outside of the cylinder. A shaft is provided at the center of the energy storage wheel. Support arms are rotatably connected to both sides of the shaft. The two support arms are fixedly connected to a back plate. The back plate is connected to the drill bit body by bolts. A torsion spring is wound on one of the shafts of the energy storage wheel. One side of the torsion spring is fixedly connected to the energy storage wheel, and the other side of the torsion spring is fixedly connected to the support arm.

[0008] The energy storage wheel is a gear without all its teeth. The area covered by the teeth of the energy storage wheel is less than half of the circumference. The teeth of the energy storage wheel mesh with the rack for transmission. The inner hole of the support arm is machined with a ratchet hole. The area covered by the ratchet hole is the same as that of the teeth. The support arm has an annular cavity in the circumferential direction without the ratchet hole. The inner diameter of the annular cavity is larger than that of the ratchet hole. The shaft has a groove on the outer circle connected to the support arm. The groove is rotatably connected to the check plate in the axial direction of the shaft via a pin. A compression spring C is installed between the check plate and the bottom of the groove. The top of the check plate is inserted into the ratchet hole.

[0009] The filter cartridge has a vertically oriented groove on one side of the stepped tube. The drill bit body has a stepped surface at the location of the groove. The stepped surface is connected to a limiting plate by bolts. The limiting plate is inserted horizontally into the groove.

[0010] The lower end of the drill bit body has a water inlet hole facing upwards. The outer circumference of the drill bit body has a transverse hole, and the inner side of the transverse hole has a conical hole that communicates with the water inlet hole. A steel ball is installed in the transverse hole and rests on the conical hole. A compression spring B is installed on the outside of the steel ball, and a valve seat is installed on the outside of the compression spring B. The valve seat is connected to the transverse hole through threads and a sealing ring. The transverse hole communicates with a stepped hole C. An annular groove is machined at the bottom of the stepped hole C, and an annular capsule is installed in the annular groove. The capsule is filled with compressed air.

[0011] A water divider is installed inside the filter cylinder. The top of the filter cylinder is machined into an inclined surface, with the highest point of the inclined surface located on one side of the drill bit body axis. The water divider divides the filter cylinder into inner and outer flow channels, with the cross-sectional area of ​​the inner flow channel being half that of the outer flow channel.

[0012] When the rack moves from top to bottom and meshes with the toothed block, the torsion spring is in the tightening process, the check plate is pressed against the ratchet hole, and the energy storage wheel cannot reverse. When the rack is completely in the position of the lowest toothed block of the energy storage wheel, the check plate is in the annular position. In the free state of the energy storage wheel, the uppermost toothed block of the energy storage wheel is in a position that can block the rack.

[0013] The beneficial effects of this invention are as follows: By utilizing the pressure generated during drilling, the filter cylinder descends, and the energy storage component stores and releases the compressed energy of the compression spring A, causing the filter screen to periodically vibrate upwards, ejecting any mud and cuttings that may have entered the filter screen. This ensures that the water holes are not blocked by mud and cuttings, guaranteeing smooth drilling operations and improving the efficiency of the screw drill bit. Even when drilling stops, the filter screen remains unblocked. Furthermore, the application of the water distribution plate improves the cooling effect of the drilling mud, extending the service life of the cutting edges. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Appendix Figure 2 It is attached Figure 1 AA cross-section view;

[0016] Appendix Figure 3 It is attached Figure 2 Enlarged view of point B;

[0017] Appendix Figure 4 This is a schematic diagram of the energy storage component;

[0018] Appendix Figure 5 This is a top view of the energy storage component;

[0019] Appendix Figure 6 It is attached Figure 5 CC cross-section;

[0020] Appendix Figure 7 It is attached Figure 6 Cross-sectional view of the central axis

[0021] Appendix Figure 8 This is a schematic diagram of the motion of the energy storage wheel and rack;

[0022] Appendix Figure 9 This is a schematic diagram of the filter cartridge in this invention;

[0023] Appendix Figure 10 This is a schematic diagram of the structure of the drill bit body of the present invention.

[0024] In the diagram: 1-Drill bit body, 101-Water inlet, 2-Cutting edge, 3-Water eye, 301-Stepped hole A, 302-Stepped hole B, 303-Transverse groove, 304-Stepped hole C, 305-Annular groove, 306-Transverse hole, 3061-Conical hole, 307-Stepped surface, 4-Filter assembly, 5-Water divider plate, 6-Compression spring A, 7-Energy storage assembly, 701-Energy storage wheel, 7011-Tooth block, 702-Rack, 703 - Torsion spring, 704- Shaft, 7041- Groove, 705- Back plate, 706- Support arm, 7061- Annular cavity, 7062- Rattle hole, 8- Filter cylinder, 801- Stepped tube, 802- Cylinder body, 803- Inclined surface, 805- Strip groove, 9- Filter screen, 10- Capsule, 11- Steel ball, 12- Compression spring B, 13- Valve seat, 14- Limiting plate, 15- Compression spring C, 16- Pin, 17- Check plate. Detailed Implementation

[0025] like Figures 1-10 As shown, a long-lasting screw drill includes a drill bit body 1. The upper part of the drill bit body 1 is provided with a cutting edge 2 and a water eye 3. The number of cutting edges 2 and water eyes 3 is three. The cutting edges 2 and water eyes 3 are arranged at intervals. The cutting edges 2 and water eyes 3 are evenly arranged along the central circumference of the drill bit body 1. A filter assembly 4 is provided in the water eye 3.

[0026] Filter assembly 4 includes filter cylinder 8, which is installed inside water eye 3. A filter screen 9 is provided on the top plate of filter cylinder 8. Water eye 3 is machined with stepped holes A301, B302, and C304 from top to bottom, with the diameters of stepped holes A301, B302, and C304 decreasing sequentially. Filter cylinder 8 consists of an upper stepped tube 801 and a lower cylinder 802. The stepped tube 801 is clearance-fitted with stepped hole A301, and the cylinder 802 is clearance-fitted with stepped hole C304. A compression spring A6 is provided between the bottom surface of stepped hole A301 and the stepped tube 801. Drill bit body 1 is located within the stepped hole... A transverse groove 303 is provided at position B302. An energy storage component 7 is provided in the transverse groove 303. The energy storage component 7 includes a rack 702 and an energy storage wheel 701. The rack 702 is vertically fixed to the outside of the cylinder 802. A shaft 704 is provided at the center of the energy storage wheel 701. Support arms 706 are rotatably connected to both sides of the shaft 704. The two support arms 706 are fixedly connected to the back plate 705. The back plate 705 is connected to the drill bit body 1 by bolts. A torsion spring 703 is wound on one of the shafts 704 of the energy storage wheel 701. One side of the torsion spring 703 is fixedly connected to the energy storage wheel 701, and the other side of the torsion spring 703 is fixedly connected to the support arm 706.

[0027] The energy storage wheel 701 is a gear without all the tooth blocks 7011. The area of ​​the tooth blocks 7011 covering the energy storage wheel 701 is less than half of the circumference. The tooth blocks 7011 of the energy storage wheel 701 mesh with the rack 702 for transmission. The inner hole of the support arm 706 is machined with a ratchet hole 7062. The area of ​​the ratchet hole 7062 covering the energy storage wheel 701 is the same as that of the tooth blocks 7011. The support arm 706 has an annular cavity 7061 in the circumferential direction where there is no ratchet hole 7062. The inner diameter of the annular cavity 7061 is larger than that of the ratchet. The outer circle of the shaft 704, which is connected to the support arm 706, has a groove 7041. The groove 7041 is rotatably connected to the check plate 17 via the pin 16 in the axial direction of the shaft 704. A compression spring C15 is installed between the check plate 17 and the bottom of the groove 7041. The top of the check plate 17 is inserted into the ratchet hole 7062. The shaft 704 can only rotate in the direction of the check plate 17 in the ratchet hole 7062. When the check plate 17 enters the annular space 7061, the shaft 704 is in a free state.

[0028] The filter cartridge 8 has a vertically oriented strip groove 804 on one side of the stepped tube 801. The drill bit body 1 has a stepped surface 307 at the position of the strip groove 804. The stepped surface 307 is connected to the limiting plate 14 by bolts. The limiting plate 14 is inserted horizontally into the strip groove 804.

[0029] The lower end of the drill bit body 1 has a water inlet hole 101 facing upwards. The outer circle of the drill bit body 1 has a transverse hole 306. A conical hole 3061 is formed inside the transverse hole 306. The conical hole 3061 is connected to the water inlet hole 101. A steel ball 11 is installed inside the transverse hole 306. The steel ball 11 rests on the conical hole 3061. A compression spring B12 is provided outside the steel ball 11. A valve seat 13 is provided outside the compression spring B12. The valve seat 13 is connected to the transverse hole 306 through threads and a sealing ring. This part forms a one-way valve, which prevents drilling mud from flowing out in reverse. The transverse hole 306 is connected to the stepped hole C304. An annular groove 305 is machined at the bottom of the stepped hole C304. An annular capsule 10 is installed in the annular groove 305. The capsule 10 is filled with compressed air.

[0030] A water divider plate 5 is installed inside the filter cylinder 8. The top of the filter cylinder 8 is machined into a slope 803. The highest point of the slope 803 is located on one side of the axis of the drill bit body 1. The water divider plate 5 divides the filter cylinder 8 into inner and outer flow channels. The cross-sectional area of ​​the inner flow channel is half that of the outer flow channel. The cross-sectional area of ​​the inner flow channel is small, the drilling mud flow rate is high, and the cooling effect of the sprayed cutting edge 2 is better, which improves the service life of the cutting edge 2.

[0031] When the rack 702 moves from top to bottom and meshes with the toothed block 7011, the torsion spring 703 is in the tightening process, the check plate 17 is pressed against the ratchet hole 7062, and the energy storage wheel 701 cannot reverse. When the rack 702 is completely in the position of the lowest toothed block 7011 of the energy storage wheel 701, the check plate 17 is in the position of the annular space 7061. In the free state of the energy storage wheel 701, the uppermost toothed block 7011 of the energy storage wheel 701 is in a position that can block the rack 702.

[0032] When the screw drill bit is drilling, the drilling mud drive motor rotates and then enters the water inlet 3 through the inlet hole 101. The rock cuttings and soil cut by the rotating drill bit are flushed to the outside of the drill bit and return to the surface by the drilling mud. The drilling mud also cools the cutting edge 2. When the drill bit is drilling, the pressure of the rock cuttings and soil causes the filter cylinder 8 to descend in the water inlet 3. The compression spring A6 is compressed and contracts. After the rack 702 descends, it engages with the tooth block 7011. Due to the action of the ratchet hole 7062 and the check plate 17, the energy storage wheel 701 cannot reverse at this time, that is, the energy storage wheel 701 hooks the rack 702 and descends. The cylinder 8 can rise, and the compression spring A6 remains compressed until the rack 702 completely passes the energy storage wheel 701. At this time, the check plate 17 rotates to the annular space 7061 of the support arm. Under the action of the torsion spring 703, the energy storage wheel 701 reverses, the rack 702 loses contact with the tooth block 7011, and the compression spring A6 rebounds quickly, throwing out any mud and rock cuttings that may get stuck in the filter screen 9. Then the filter cylinder 8 descends again, and this process is repeated to keep the filter screen 9 clean, thereby ensuring that the water hole 3 is not blocked by mud and rock cuttings, ensuring the smooth progress of drilling operations, and improving the efficiency of the screw drill bit.

[0033] During drilling, drilling mud pushes the steel ball into the water hole 3. The pressure of the drilling mud causes the capsule 10 to be in a compressed state. When drilling stops, the drilling mud injection stops, and the steel ball 11 is pressed against the conical hole 3061 by the compression spring B12, closing the fluid inlet channel. At this time, the drilling mud pressure in the water hole 3 disappears, the capsule 10 resumes expansion, and squeezes the mud in the water hole 3 to flow out of the filter screen 9, thereby preventing soil and rock cuttings from entering the filter screen 9.

[0034] By utilizing the pressure generated during drilling, the filter cylinder 8 descends, and the energy storage component 7 releases the compressed energy stored in the compression spring A6, causing the filter screen 9 to periodically vibrate upwards, ejecting any mud or cuttings that may have entered the filter screen 9. This ensures that the water hole 3 is not blocked by mud or cuttings, guaranteeing smooth drilling operations and improving the efficiency of the screw drill bit. Even when drilling stops, the filter screen 9 remains unblocked. Furthermore, the application of the water distribution plate 5 improves the cooling effect of the drilling mud, extending the service life of the cutting edge 2.

Claims

1. A long-life screw drill bit, comprising a drill bit body (1), characterized in that: The upper part of the drill bit body (1) is provided with a cutting edge (2) and a water eye (3). There are three cutting edges (2) and water eyes (3). The cutting edges (2) and water eyes (3) are arranged at intervals. The cutting edges (2) and water eyes (3) are evenly arranged along the central circumference of the drill bit body (1). A filter assembly (4) is provided in the water eye (3). The filter assembly (4) includes a filter cylinder (8), which is installed inside the water eye (3). The top plate of the filter cylinder (8) is provided with a filter screen (9). The water eye (3) is machined with stepped holes A (301), B (302) and C (304) from top to bottom. The diameters of the stepped holes A (301), B (302) and C (304) decrease sequentially. The filter cylinder (8) is composed of an upper stepped tube (801) and a lower cylinder (802). The stepped tube (801) is clearance-fitted with the stepped hole A (301), and the cylinder (802) is clearance-fitted with the stepped hole C (304). A compression spring A (6) is provided between the bottom surface of the stepped hole A (301) and the stepped tube (801). The drill bit body (1) is located in the stepped hole. A transverse groove (303) is provided at position B (302). An energy storage component (7) is provided in the transverse groove (303). The energy storage component (7) includes a rack (702) and an energy storage wheel (701). The rack (702) is vertically fixed on the outside of the cylinder (802). A shaft (704) is provided at the center of the energy storage wheel (701). Support arms (706) are rotatably connected to both sides of the shaft (704). The two support arms (706) are fixedly connected to the back plate (705). The back plate (705) is connected to the drill bit body (1) by bolts. A torsion spring (703) is wound on one of the shafts (704) of the energy storage wheel (701). One side of the torsion spring (703) is fixedly connected to the energy storage wheel (701), and the other side of the torsion spring (703) is fixedly connected to the support arm (706). The energy storage wheel (701) is a gear without all its toothed blocks (7011). The area covered by the toothed blocks (7011) of the energy storage wheel (701) is less than half the circumference. The toothed blocks (7011) of the energy storage wheel (701) mesh with the rack (702) for transmission. The inner hole of the support arm (706) is machined with a ratchet hole (7062). The area covered by the ratchet hole (7062) of the energy storage wheel (701) is the same as that of the toothed blocks (7011). The support arm (706) is located where the ratchet hole (7062) is not present. A circular opening (7061) is provided in the circumferential direction. The inner diameter of the circular opening (7061) is larger than that of the ratchet hole (7062). A groove (7041) is provided on the outer circle of the shaft (704) that is connected to the support arm (706). The groove (7041) is rotatably connected to the check plate (17) in the axial direction of the shaft (704) via a pin (16). A compression spring C (15) is installed between the check plate (17) and the bottom of the groove (7041). The top of the check plate (17) is inserted into the ratchet hole (7062). The filter cartridge (8) has a vertically oriented strip groove (804) on one side of the stepped tube (801). The drill bit body (1) has a stepped surface (307) at the position of the strip groove (804). The stepped surface (307) is connected to the limiting plate (14) by bolts. The limiting plate (14) is inserted horizontally into the strip groove (804). The lower end of the drill bit body (1) has a water inlet hole (101) facing upwards. The outer circle of the drill bit body (1) has a transverse hole (306). A conical hole (3061) is opened inside the transverse hole (306). The conical hole (3061) is connected to the water inlet hole (101). A steel ball (11) is installed in the transverse hole (306). The steel ball (11) rests on the conical hole (3061). A compression spring B (12) is provided on the outside of the steel ball (11). A valve seat (13) is provided on the outside of the compression spring B (12). The valve seat (13) is connected to the transverse hole (306) through threads and a sealing ring. The transverse hole (306) is connected to the stepped hole C (304). An annular groove (305) is machined at the bottom of the stepped hole C (304). An annular capsule (10) is installed in the annular groove (305). The capsule (10) is filled with compressed air.

2. The long-life screw drill bit according to claim 1, characterized in that: A water divider plate (5) is installed inside the filter cylinder (8). The top of the filter cylinder (8) is machined into a slope (803). The high point of the slope (803) is located on one side of the axis of the drill bit body (1). The water divider plate (5) divides the filter cylinder (8) into two channels, inner and outer. The cross-sectional area of ​​the inner channel is half that of the outer channel.

3. The long-life screw drill bit according to claim 1, characterized in that: When the rack (702) moves from top to bottom and meshes with the toothed block (7011), the torsion spring (703) is in the tightening process, the check plate (17) is pressed against the ratchet hole (7062), and the energy storage wheel (701) cannot reverse. When the rack (702) is completely in the position of the lowest toothed block (7011) of the energy storage wheel (701), the check plate (17) is in the position of the annular space (7061). In the free state of the energy storage wheel (701), the uppermost toothed block (7011) of the energy storage wheel (701) is in a position that can block the rack (702).

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