Magnetic force type bidirectional shock absorber

Abstract

The invention belongs to the technical field of petroleum downhole tools, particularly relates to a magnetic force type bidirectional shock absorber and aims to solve the problem that bit pressure and torque at a drill bit cannot be kept stable due to the fact that a drilling tool vibrates easily. The device comprises a mandrel connecting assembly and a magnetic vibration reduction assembly. The mandrel connecting assembly comprises a rotating mandrel and a spline housing which is arranged on the rotating mandrel in a sleeving manner and is in key connection with the rotating mandrel; the magnetic vibration reduction assembly comprises an outer shell, a magnetic center shaft, an inductance magnet, a controller, a permanent magnet and a Hall sensor. The direction of current in the magnetic induction coil is reversed through induction of the Hall sensor to the magnetism of the magnet, so that the magnetic pole is changed, and repulsive magnetic damping force is generated during upward vibration. Pressure fluctuation can be effectively relieved, the drill bit jumping possibility is reduced, fatigue damage of a drilling tool is reduced, the service life of a drill column is prolonged, and economic benefits are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of oil well downhole tools, and specifically relates to a magnetic bidirectional vibration damper. Background Technology

[0002] Currently, the working environment is extremely harsh when drilling encounters formations with alternating soft and hard rock types and heterogeneous lithology. This can easily cause drill string vibration, making it impossible to maintain stable drilling pressure and torque at the drill bit. Instead, these fluctuations can lead to drill skipping.

[0003] On the other hand, harmful vibrations in the longitudinal, circumferential, and lateral directions subject the drill string to alternating stress, creating a poor working environment that easily leads to fatigue failure, causing downhole safety accidents and increasing drilling costs. Drilling fluid pressure fluctuations are also a significant cause of harmful vibrations when using downhole power drilling tools. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, namely the tendency of drill bits to vibrate, which prevents the drill pressure and torque at the drill bit from remaining stable, this invention provides a magnetic bidirectional vibration damper.

[0005] This application discloses a magnetic bidirectional vibration damper, which adopts the following technical solution:

[0006] A magnetic bidirectional vibration damper includes a spindle connection assembly and a magnetic vibration damping assembly;

[0007] The spindle connection assembly includes a rotating spindle and a spline sleeve fitted on the rotating spindle and connected to the key of the rotating spindle.

[0008] The magnetic vibration damping assembly includes a housing, a magnetic central shaft, an inductive magnet, a controller, a permanent magnet, and a Hall sensor;

[0009] The outer shell is connected to the lower end of the spline sleeve; the magnetic central shaft is connected to the lower end of the rotation axis, and there is a gap between the magnetic central shaft and the outer shell; the Hall sensor is installed on the magnetic central shaft; the permanent magnet is sleeved on the central shaft and fixed to the inner wall of the outer shell; the Hall sensor is installed in the middle of the permanent magnet.

[0010] The inductive magnet is arranged on the upper side of the permanent magnet and spaced apart from the permanent magnet. A coil is wound on the inductive magnet, and the coil is spirally wound along the groove of the magnet. When the coil is energized, the inductive magnet is magnetic. The controller is used to change the direction of the current in the coil wound on the inductive magnet.

[0011] The outer casing is connected to the lower connector, and the rotating spindle and the magnetic center axis are tubular.

[0012] By adopting the above technical solution, when the drilling machine vibrates upward, the outer shell drives the permanent magnet to move upward. At this time, the Hall sensor approaches the S pole and inputs a high level to the controller. The current direction in the coil remains unchanged, the magnetic poles of the inductor remain unchanged, and the two N poles relative to each other will dampen the upward movement of the permanent magnet. When the drilling machine vibrates downward, the outer shell drives the permanent magnet to move downward. At this time, the Hall sensor approaches the N pole and inputs a low level to the controller. The current direction in the coil changes, the magnetic poles of the inductor switch, and the N poles and S poles relative to each other will dampen the downward movement of the permanent magnet.

[0013] Preferably, the magnetic vibration damping assembly further includes a downhole energy storage battery for powering the coil, controller, and Hall sensor, the downhole energy storage battery being arranged above the controller.

[0014] Preferably, a sealing ring protrudes from the rotating spindle, and a limiting ring is fitted onto the sealing ring, with the limiting ring positioned on the upper side of the downhole energy storage battery.

[0015] Preferably, it also includes a hydraulic damping assembly; the hydraulic damping assembly includes a hydraulic housing, a hydraulic central shaft, an upper piston, a lower piston, and a damping valve with a damping orifice;

[0016] The upper end of the hydraulic housing is connected to the lower end of the housing body, and the lower end is connected to the upper end of the lower connector.

[0017] The hydraulic central shaft passes through the hydraulic housing, and there is a gap between the hydraulic central shaft and the hydraulic housing; the upper end of the hydraulic central shaft is connected to the lower end of the magnetic central shaft.

[0018] The upper piston is fixed in the outer casing, the lower piston is fixed in the hydraulic housing, the damping valve is arranged between the upper piston and the lower piston, and the damping valve is fixed on the hydraulic central shaft; the upper piston, the hydraulic housing, the hydraulic central shaft, and the damping valve form an upper hydraulic chamber; the lower piston, the hydraulic housing, the hydraulic central shaft, and the damping valve form a lower hydraulic chamber; the damping hole on the damping valve connects the upper hydraulic chamber and the lower hydraulic chamber;

[0019] The hydraulic central shaft is tubular.

[0020] Preferably, a locking nut is fitted on the hydraulic central shaft. The locking nut is threaded onto the hydraulic central shaft, and the locking nut and the stepped surface on the hydraulic central shaft together provide axial limiting for the damping valve.

[0021] Preferably, there are two damping holes, which are arranged at equal intervals along the circumference on the damping valve. A one-way valve is installed at the opening of the damping hole, and the one-way valves in the two damping holes are respectively installed on the upper and lower sides of the damping valve.

[0022] Preferably, a pad is fitted on the magnetic central shaft, and the pad separates the permanent magnet from the upper piston.

[0023] Preferably, a limiting sleeve is installed in the hydraulic housing. The limiting sleeve is arranged on the lower side of the lower piston and is fixedly connected to the inner wall of the hydraulic housing, thus supporting the lower piston.

[0024] Preferably, the hydraulic housing has an upper injection hole and a lower injection hole, the upper injection hole being connected to the upper hydraulic chamber and the lower injection hole being connected to the lower hydraulic chamber.

[0025] Preferably, it also includes a pressure wave buffer assembly; the pressure wave buffer assembly includes an inlet central shaft connected to a hydraulic central shaft, an inlet hole provided on the inlet central shaft, and a pressure bearing sleeve sleeved on the inlet central shaft and connected to the outer wall of the inlet central shaft, the inlet hole being arranged on the upper side of the pressure bearing sleeve, and a gap existing between the pressure bearing sleeve and the limiting sleeve.

[0026] The lower piston, pressure sleeve, liquid inlet central shaft, lower connector and hydraulic housing form a liquid inlet cavity, and the liquid inlet hole communicates with the liquid inlet cavity;

[0027] The liquid inlet central axis is tubular.

[0028] The beneficial effects of this invention are as follows: The magnetic bidirectional vibration damper reverses the direction of the current in the magnetic coil by sensing the magnet's magnetism through a Hall sensor, thereby changing the magnetic poles and generating a repulsive magnetic damping force during upward vibration. Simultaneously, the vertical vibration of the drill bit causes changes in the hydraulic chamber volume. The fluid flowing through the hydraulic chamber must overcome the resistance of the slender flow channel and the one-way valve, generating hydraulic damping. By adding a pressure wave buffer assembly at the bottom, pressure fluctuations can be effectively mitigated, preventing further aggravation of harmful vibrations. This invention effectively alleviates pressure fluctuations, reduces the possibility of drill bit skipping, and helps reduce drill bit fatigue damage, extend drill string service life, and improve economic efficiency. Attached Figure Description

[0029] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the initial state of the magnetic bidirectional vibration damper in this embodiment;

[0031] Figure 2 This is a schematic diagram of the mandrel connection assembly in this embodiment;

[0032] Figure 3 This is a schematic diagram of the rotating mandrel in this embodiment;

[0033] Figure 4This is a schematic diagram of the rotating mandrel in this embodiment;

[0034] Figure 5 This is a schematic diagram of the magnetic damping assembly and the hydraulic damping assembly in this embodiment;

[0035] Figure 6 This is a schematic diagram of the downhole energy storage battery in this embodiment;

[0036] Figure 7 This is a schematic diagram of the magnetic center axis in this embodiment;

[0037] Figure 8 This is a schematic diagram of the magnetic center axis in this embodiment;

[0038] Figure 9 This is a schematic diagram of the damping valve in this embodiment;

[0039] Figure 10 This is a schematic diagram of the damping valve in this embodiment;

[0040] Figure 11 This is a schematic diagram of the magnetic bidirectional vibration damper in the upward vibration state in this embodiment;

[0041] Figure 12 This is a schematic diagram of the magnetic bidirectional vibration damper in the downward vibration state in this embodiment.

[0042] Explanation of reference numerals in the attached drawings: 1. Mandrel connection assembly; 101. Rotating mandrel; 102. Spline; 103. Spline groove; 104. Spline sleeve; 105. Sealing ring; 106. Trapezoidal thread; 107. Limiting ring; 109. Shaft body groove; 110. Center hole; 2. Sealing element; 3. Magnetic vibration damping assembly; 301. Downhole energy storage battery; 302. Controller; 303. Housing; 304. Inductive magnet; 305. Magnetic central shaft; 306. Permanent magnet; 307. Hall sensor; 308. Gasket; 309. Wiring groove; 310. Coil; 31 1. Magnet groove; 312. Threaded hole; 313. Positioning shaft groove; 4. Hydraulic damping assembly; 401. Upper piston; 402. Hydraulic housing; 403. Upper hydraulic chamber; 404. Locking nut; 405. Hydraulic central shaft; 406. Check valve; 407. Lower hydraulic chamber; 408. Lower piston; 409. Limit sleeve; 410. Damping valve; 411. Damping hole; 412. Upper injection hole; 413. Lower injection hole; 5. Pressure wave buffer assembly; 501. Inlet hole; 502. Inlet central shaft; 503. Pressure bearing sleeve; 504. Inlet chamber; 6. Lower connector. Detailed Implementation

[0043] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] This invention provides a magnetic bidirectional vibration damper, referring to... Figure 1 The magnetic bidirectional vibration damper includes a spindle connection assembly 1, a sealing element 2, a magnetic vibration damping assembly 3, a hydraulic vibration damping assembly 4, and a pressure wave buffer assembly 5. The upper side of the magnetic bidirectional vibration damper is connected to the drill pipe, and the lower side is connected to the drill bit.

[0046] Reference Figure 2 , Figure 3 , Figure 4 The mandrel connection assembly 1 includes a rotating mandrel 101, which is divided into a first section, a second section, and a third section. The diameters of the first, second, and third sections decrease sequentially, and a central hole 110 is provided through the rotating mandrel 101 along its length. The first section is connected to the drill pipe, and the drilling fluid in the drill pipe is transferred to the central hole 110 in the rotating mandrel 101 via the drill pipe, and then transferred to the drill bit via the central hole 110.

[0047] The second section has a protruding spline 102, and a spline sleeve 104 is fitted on the rotating spindle 101. A spline groove 103 that mates with the spline 102 is opened on the inner wall of the spline sleeve 104, so that the rotating spindle 101 can drive the spline sleeve 104 to rotate when it rotates, and transmit torque to the spline sleeve 104.

[0048] The third section has a protruding limiting ring 107, which is concentric with the rotating spindle 101. A trapezoidal thread 106 is provided on the outer ring surface of the limiting ring 107. The limiting ring 107 is arranged in the spline sleeve 104. A sealing ring 105 is installed between the spline sleeve 104 and the limiting ring 107. The sealing ring 105 is fixedly connected to the limiting ring 107 on the rotating spindle 101 through the trapezoidal thread 106.

[0049] The third section has a shaft groove 109, which is opened along the length of the rotating spindle 101. There are two shaft grooves 109 arranged around the rotating spindle 101 for wiring.

[0050] Trapezoidal threads are also provided on the third section.

[0051] When the rotating spindle 101 is connected to the spline sleeve 104, the sealing element 2 seals the contact between the spline sleeve 104 and the sealing ring 105.

[0052] The sealing element 2 is used for sealing the connection between the spindle connection assembly 1, the magnetic damping assembly 3, the hydraulic damping assembly 4, and the pressure wave buffer assembly 5.

[0053] Reference Figure 2 , Figure 5 The magnetic vibration damping assembly 3 includes a housing 303, and a magnetic central shaft 305 is inserted in the housing 303, with a gap between the magnetic central shaft 305 and the housing 303.

[0054] The outer casing 303 is connected to the spline sleeve 104 via a pipe thread, and the lower end of the spline sleeve 104 is inserted into the upper end of the outer casing 303. When the outer casing 303 is connected to the spline sleeve 104, the lower end of the rotating spindle 101 is inserted into the outer casing 303.

[0055] The magnetic center shaft 305 is tubular, and its upper end is fitted onto the lower end of the rotating spindle 101, and the two are connected by a pipe thread. The connection between the upper end of the magnetic center shaft 305 and the lower end of the rotating spindle 101 is located in the outer casing 303.

[0056] A downhole energy storage battery 301 and a controller 302 are mounted on the third section of the rotating spindle 101, as shown in the reference. Figure 6 Both the downhole energy storage battery 301 and the controller 302 have wires that can be connected to their inner surfaces, and wiring slots 309 are provided on their outer surfaces. The downhole energy storage battery 301 and the controller 302 are connected by wires through the wiring slots 309, and the downhole energy storage battery 301 provides power to the controller 302. The downhole energy storage battery 301 is arranged in a spline sleeve 104, and the controller 302 is arranged in a housing 303.

[0057] An inductive magnet 304 is fitted onto the third section of the rotating mandrel 101. The inductive magnet 304 is threadedly connected to the rotating mandrel 101 and is located below the controller 302, within the outer casing 303. A coil 310 is wound around the inductive magnet 304, spirally wound along the magnet's groove 311. When the coil 310 is energized, the inductive magnet 304 becomes magnetic. The downhole energy storage battery 301 is connected to the Hall sensor 307 and the coil 310, providing power to them. The controller 302 is used to change the direction of the current in the coil 310 wound around the inductive magnet 304. (Refer to...) Figure 7 , Figure 8Furthermore, a threaded hole 312 and a positioning groove 313 arranged along the length of the magnetic central shaft 305 are provided on the outer wall of the magnetic central shaft 305. A Hall sensor 307 is installed in the threaded hole 312, and the positioning groove 313 is used for the upward wiring of the Hall sensor 307. The controller 302 and the Hall sensor 307 work together to change the direction of the current in the coil 310. When a low level is input to the pin of the controller 302, the positive and negative poles of the current in the Hall sensor 307 are reversed, thereby reversing the N pole and S pole of the inductor magnet 304.

[0058] A permanent magnet 306 is fitted onto the magnetic central shaft 305 and fixed to the outer casing 303. The permanent magnet 306 is positioned at the threaded hole 312 of the magnetic central shaft 305 where the Hall sensor 307 is mounted. The permanent magnet 306 is spaced apart from the inductive magnet 304. The upper end of the permanent magnet 306 is the N pole, and the lower end is the S pole. The Hall sensor 307 is installed in the middle of the permanent magnet 306. It outputs a low level when it is close to the N pole and a high level when it is close to the S pole. When the drill vibrates upward, the housing 303 drives the permanent magnet 306 to move upward. At this time, the Hall sensor 307 is close to the S pole and inputs a high level to the controller 302. The current direction in the coil 310 remains unchanged, the magnetic poles of the inductor 304 remain unchanged, and the two N poles relative to each other will dampen the upward movement of the permanent magnet 306. When the drill vibrates downward, the housing 303 drives the permanent magnet 306 to move downward. At this time, the Hall sensor 307 is close to the N pole and inputs a low level to the controller 302. The current direction in the coil 310 changes, the magnetic poles of the inductor 304 switch, and the N and S poles relative to each other will dampen the downward movement of the permanent magnet 306.

[0059] Reference Figure 5 The hydraulic damping assembly 4 includes a hydraulic housing 402, and a hydraulic central shaft 405 is inserted through the hydraulic housing 402, with a gap between the hydraulic central shaft 405 and the hydraulic housing 402.

[0060] The hydraulic housing 402 is connected to the housing body 303 via a pipe thread, and the lower end of the magnetic central shaft 305 is inserted into the upper end of the hydraulic housing 402. When the hydraulic housing 402 is connected to the housing body 303, the lower end of the magnetic central shaft 305 is inserted into the hydraulic housing 402. The housing body 303 and the hydraulic housing 402 are sealed by the sealing element 2. The lower end of the hydraulic housing 402 is connected to the lower connector 6 via a pipe thread.

[0061] The hydraulic central shaft 405 is tubular. An upper piston 401 is fitted onto the magnetic central shaft 305, located within the outer casing 303 and below the permanent magnet 306, separated from the permanent magnet 306 by a gasket 308. A damping valve 410 is fitted onto the hydraulic central shaft 405, located within the hydraulic housing 402. A locking nut 404 is fitted onto the hydraulic central shaft 405, threaded onto it. The locking nut 404 and a stepped surface on the hydraulic central shaft 405 together axially limit the damping valve 410, thus fixing it to the hydraulic central shaft 405. The upper piston 401, together with the hydraulic housing 402, the hydraulic central shaft 405, and the damping valve 410, forms an upper hydraulic chamber 403. An upper injection hole 412 is provided on the hydraulic housing 402, and silicone oil is injected into the upper hydraulic chamber 403 through a lower injection hole 413. The volume of the upper hydraulic chamber 403 increases when the hydraulic housing 402, upper piston 401, and gasket 308 move upwards, and decreases when they move downwards.

[0062] A lower piston 408 is fitted onto the hydraulic central shaft 405 and is arranged within the hydraulic housing 402. A limiting sleeve 409 is installed within the hydraulic housing 402, positioned below the lower piston 408 and fixedly connected to the inner wall of the hydraulic housing 402, thus supporting the lower piston 408. The lower piston 408, together with the hydraulic housing 402, the hydraulic central shaft 405, and the damping valve 410, forms a lower hydraulic chamber 407. A lower injection hole 413 is provided on the hydraulic housing 402, through which silicone oil is injected into the lower hydraulic chamber 407. The volume of the lower hydraulic chamber 407 decreases when the lower connector 6, hydraulic housing 402, limiting sleeve 409, and lower piston 408 move upwards, and increases when they move downwards. The upper injection hole 412 and lower injection hole 413 are sealed with sealing pins after the silicone oil is injected.

[0063] Reference Figure 9 , Figure 10 A damping orifice 411 is provided on the damping valve 410 to generate a certain liquid damping when silicone oil passes through. Two damping orifices 411 are provided on the damping valve 410, and the two orifices 411 are arranged at equal intervals along the circumference. A one-way valve 406 is installed at the opening of each damping orifice 411, with the one-way valve 406 installed on the upper and lower sides of the damping valve 410, respectively. In this embodiment, the one-way valve 406 on the left is installed on the upper side, and the one-way valve 406 on the right is installed on the lower side. The one-way valve 406 is interference-fitted with the damping orifice 411 and opens in a specific direction when the hydraulic pressure is higher than a preset pressure.

[0064] When the drilling machine vibrates upward, the lower connector 6, limit sleeve 409, lower piston 408, hydraulic housing 402, upper piston 401, gasket 308, housing 303, permanent magnet 306, and spline sleeve 104 all undergo axial upward displacement. The volume of the upper hydraulic chamber 403 increases, while the volume of the lower hydraulic chamber 407 decreases after compression. The left check valve 406 opens under greater hydraulic pressure. The silicone oil in the lower hydraulic chamber 407 flows to the upper hydraulic chamber 403 after overcoming the flow resistance of the slender damping orifice 411 and the left check valve 406, generating hydraulic damping to reduce vibration. When the drilling machine vibrates downwards, the lower connector 6, limit sleeve 409, lower piston 408, hydraulic housing 402, upper piston 401, gasket 308, housing 303, permanent magnet 306, and spline sleeve 104 all undergo axial downward displacement. The volume of the upper hydraulic chamber 403 decreases after compression, while the volume of the lower hydraulic chamber 407 increases. The right-side check valve 406 opens under greater hydraulic pressure. The silicone oil in the upper hydraulic chamber 403 flows into the lower hydraulic chamber 407 after overcoming the flow resistance of the slender damping orifice 411 and the right-side check valve 406, generating hydraulic damping to reduce vibration.

[0065] Reference Figure 5 The pressure wave buffer assembly 5 includes a liquid inlet central shaft 502 connected to the hydraulic central shaft 405. The liquid inlet central shaft 502 is tubular and arranged in the lower connector 6. The upper end of the liquid inlet central shaft 502 is sleeved on the lower end of the hydraulic central shaft 405 and passes through the limiting sleeve 409.

[0066] A liquid inlet hole 501 is provided on the liquid inlet central shaft 502. Multiple liquid inlet holes 501 are provided and are equally spaced on the circumference of the liquid inlet central shaft 502. In this embodiment, six are provided.

[0067] A pressure-bearing sleeve 503 is fitted onto the liquid inlet central shaft 502 and threadedly connected to the outer wall of the liquid inlet central shaft 502. A liquid inlet hole 501 is located on the upper side of the pressure-bearing sleeve 503, and a gap exists between the pressure-bearing sleeve 503 and the limiting sleeve 409. A liquid inlet cavity 504 is formed between the lower piston 408, the pressure-bearing sleeve 503, the liquid inlet central shaft 502, the lower connector 6, and the hydraulic housing 402. The liquid inlet hole 501 communicates with the liquid inlet cavity 504.

[0068] Pressure fluctuations often accompany drill bit vibration. The pressure wave buffer assembly 5 converts the pressure fluctuations into the axial movement of the lower piston 408, thereby balancing the pressure waves.

[0069] The lower connector 6 is connected to the drill bit via a thread, transmitting drilling pressure and torque to the drill bit, and serves as a channel for drilling fluid to flow from the tool to the drill bit.

[0070] The sealing element 2 is used to seal the liquid flow gaps between the spline sleeve 104 and the sealing ring 105, between the upper piston 401 and the hydraulic housing 402, between the central shaft and the damping valve 410, between the lower piston 408 and the hydraulic housing 402, between the lower piston 408 and the central shaft, and between the pressure-bearing sleeve 503 and the lower connector 6.

[0071] The operating principle of a magnetic bidirectional vibration damper disclosed in this application embodiment is as follows: (Refer to...) Figure 1 , Figure 11 , Figure 12 The magnetic bidirectional vibration damper is connected to the drill rod at the top and the drill bit at the bottom. In the initial state, the torque is transmitted by the cooperation of the spline 102 and the spline groove 103, so that the rotating spindle 101 and the spline sleeve 104 can move axially relative to each other. The drilling pressure is transmitted by the magnetic force between the inductive magnet 304 and the permanent magnet 306 and the hydraulic pressure of the silicone oil in the lower hydraulic chamber 407.

[0072] When the drilling machine vibrates upwards, the lower connector 6, limit sleeve 409, lower piston 408, hydraulic housing 402, upper piston 401, gasket 308, housing 303, permanent magnet 306, and spline sleeve 104 all undergo axial upward displacement. The volume of the upper hydraulic chamber 403 increases, while the volume of the lower hydraulic chamber 407 decreases after compression. The left-side check valve 406 opens under greater hydraulic pressure, and the silicone oil in the lower hydraulic chamber 407 flows to the upper hydraulic chamber 403 after overcoming the flow resistance of the slender damping orifice 411 and the left-side check valve 406, generating hydraulic damping to reduce vibration. At the same time, the Hall sensor 307 outputs a high level near its S pole, and the magnetic poles of the inductive magnet 304 remain unchanged, causing the N pole of the permanent magnet 306 to face the N pole of the inductive magnet 304, generating a magnetic repulsive damping force against the upward displacement, thus achieving a vibration reduction effect.

[0073] When the drilling machine vibrates downwards, the lower connector 6, limit sleeve 409, lower piston 408, hydraulic housing 402, upper piston 401, gasket 308, housing 303, permanent magnet 306, and spline sleeve 104 all undergo axial downward displacement. The volume of the upper hydraulic chamber 403 decreases after compression, while the volume of the lower hydraulic chamber 407 increases. The right-side check valve 406 opens under greater hydraulic pressure. The silicone oil in the upper hydraulic chamber 403 flows into the lower hydraulic chamber 407 after overcoming the flow resistance of the slender damping orifice 411 and the right-side check valve 406, generating hydraulic damping to reduce vibration. Simultaneously, the Hall sensor 307 outputs a low level when close to its N pole, and the magnetic poles of the inductive magnet 304 reverse, causing the N pole of the permanent magnet 306 to face the S pole of the inductive magnet 304, generating a magnetic attraction damping force against the downward displacement, thus achieving a vibration reduction effect. Pressure fluctuations are often accompanied by drill bit vibration. The pressure wave buffer assembly 5 converts the pressure fluctuations into the axial movement of the lower piston 408. The lower hydraulic chamber 407, the upper hydraulic chamber 403, the damping valve 410, and the check valve 406 work together to generate hydraulic damping force, thereby balancing the pressure fluctuations.

[0074] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0075] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A magnetic bidirectional vibration damper, characterized in that: It includes a spindle connection assembly (1) and a magnetic damping assembly (3); The spindle connection assembly (1) includes a rotating spindle (101) and a spline (102) sleeve that is sleeved on the rotating spindle (101) and keyed to the rotating spindle (101); The magnetic vibration damping assembly includes a housing (303), a magnetic central shaft (305), an inductive magnet (304), a controller (302), a permanent magnet (306), and a Hall sensor (307); The outer shell (303) is connected to the lower end of the spline (102) sleeve; the magnetic central shaft (305) is connected to the lower end of the rotating shaft, and there is a gap between the magnetic central shaft (305) and the outer shell (303); the Hall sensor (307) is installed on the magnetic central shaft (305); the permanent magnet (306) is sleeved on the central shaft and fixed to the inner wall of the outer shell (303); the Hall sensor (307) is installed in the middle position of the permanent magnet (306); The inductive magnet (304) is arranged on the upper side of the permanent magnet (306) and spaced apart from the permanent magnet (306). A coil (310) is wound on the inductive magnet (304). The coil (310) is spirally wound along the magnet's groove (311). When the coil (310) is energized, the inductive magnet (304) is magnetized. The controller (302) is used to change the direction of the current in the coil (310) wound on the inductive magnet (304). The outer shell (303) is connected to the lower connector (6), and the rotating spindle (101) and the magnetic center shaft (305) are in a tubular shape.

2. The magnetic bidirectional vibration damper according to claim 1, characterized in that: The magnetic vibration damping assembly (3) also includes a downhole energy storage battery (301) for powering the coil (310), the controller (302), and the Hall sensor (307), the downhole energy storage battery (301) being arranged above the controller (302).

3. The magnetic bidirectional vibration damper according to claim 2, characterized in that: A sealing ring (105) is protruding from the rotating spindle (101), and a limiting ring (107) is sleeved on the sealing ring (105). The limiting ring (107) is arranged on the upper side of the downhole energy storage battery (301).

4. The magnetic bidirectional vibration damper according to claim 1, characterized in that: It also includes a hydraulic damping assembly (4); the hydraulic damping assembly (4) includes a hydraulic housing (402), a hydraulic central shaft (405), an upper piston (401), a lower piston (408), and a damping valve (410) with a damping hole (411); The upper end of the hydraulic housing (402) is connected to the lower end of the housing body (303), and the lower end is connected to the upper end of the lower connector (6); The hydraulic central shaft (405) passes through the hydraulic housing (402), and there is a gap between the hydraulic central shaft (405) and the hydraulic housing (402); the upper end of the hydraulic central shaft (405) is connected to the lower end of the magnetic central shaft (305); The upper piston (401) is fixed in the outer casing (303), the lower piston (408) is fixed in the hydraulic casing (402), and the damping valve (410) is arranged between the upper piston (401) and the lower piston (408). The damping valve (410) is fixed on the hydraulic central shaft (405). The upper piston (401), the hydraulic casing (402), the hydraulic central shaft (405), and the damping valve (410) form an upper hydraulic chamber (403). The lower piston (408), the hydraulic casing (402), the hydraulic central shaft (405), and the damping valve (410) form a lower hydraulic chamber (407). The damping hole (411) on the damping valve (410) connects the upper hydraulic chamber (403) and the lower hydraulic chamber (407). The hydraulic center shaft (405) is tubular.

5. The magnetic bidirectional vibration damper according to claim 4, characterized in that: A locking nut (404) is fitted on the hydraulic central shaft (405). The locking nut (404) is threaded onto the hydraulic central shaft (405). The locking nut (404) and the stepped surface on the hydraulic central shaft (405) together axially limit the damping valve (410).

6. The magnetic bidirectional vibration damper according to claim 4, characterized in that: Two damping holes (411) are provided, and the two damping holes (411) are arranged at equal intervals along the circumference on the damping valve (410). A one-way valve (406) is installed at the opening of the damping hole (411), and the one-way valve (406) in the two damping holes (411) is installed on the upper side and the lower side of the damping valve (410) respectively.

7. The magnetic bidirectional vibration damper according to claim 4, characterized in that: A sleeve (308) is fitted on the magnetic central shaft (305), and the sleeve (308) separates the permanent magnet (306) from the upper piston (401).

8. The magnetic bidirectional vibration damper according to claim 4, characterized in that: A limiting sleeve (409) is installed in the hydraulic housing (402). The limiting sleeve (409) is arranged on the lower side of the lower piston (408) and is fixedly connected to the inner wall of the hydraulic housing (402). The limiting sleeve (409) supports the lower piston (408).

9. The magnetic bidirectional vibration damper according to claim 4, characterized in that: The hydraulic housing (402) is provided with an upper injection hole (412) and a lower injection hole (413). The upper injection hole (412) is connected to the upper hydraulic chamber (403), and the lower injection hole (413) is connected to the lower hydraulic chamber (407).

10. The magnetic bidirectional vibration damper according to claim 4, characterized in that: It also includes a pressure wave buffer assembly (5); the pressure wave buffer assembly (5) includes an inlet center shaft (502) connected to the hydraulic center shaft (405), an inlet hole (501) opened on the inlet center shaft (502), and a pressure bearing sleeve (503) sleeved on the inlet center shaft (502) and connected to the outer wall of the inlet center shaft (502). The inlet hole (501) is arranged on the upper side of the pressure bearing sleeve (503), and there is a gap between the pressure bearing sleeve (503) and the limiting sleeve (409). The lower piston (408), pressure sleeve (503), liquid inlet center shaft (502), lower connector (6) and hydraulic housing (402) form a liquid inlet cavity (504), and the liquid inlet hole (501) communicates with the liquid inlet cavity (504); The liquid inlet center shaft (502) is tubular.

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