A quick response wear-resistant mud pulse generator

Abstract

The utility model relates to a kind of quick response wear-resistant mud pulse generator, it is related to well drilling technical field, including upper disc valve, lower disc valve, transmission shaft and pulser shell, upper disc valve is with mud passage, lower disc valve is with pulse sheet, transmission shaft is fixedly connected with two magnetic strips A, pulser shell is fixedly connected with a limit buffer magnetic strip, limit buffer magnetic strip is located between two magnetic strips A, any one magnetic strip A is close to limit buffer magnetic strip and generates magnetic repulsion force;Through magnetic repulsion force, the rigid impact of transmission shaft to pulser shell is reduced.The upper disc valve is with self-cleaning device, when mud passage is blocked, filter screen is forced to prop up, intercepts solid phase particle, after mud passage opens, filter screen is forced to fold, and the solid phase particle on the surface of filter screen is washed away by high-speed flowing mud liquid, and the solid phase particle is discharged from sand discharge groove.Self-cleaning device and sand discharge groove cooperate, effectively intercept solid phase particle and wash it, reduce the wear and tear of upper disc valve and lower disc valve to solid phase particle.

Description

Technical Field

[0001] This invention belongs to the field of drilling technology, and particularly relates to a fast-response, wear-resistant mud pulse generator for geothermal well operations. Background Technology

[0002] In the drilling industry, mud pulse generators are key information transmission devices for ensuring wellbore trajectory control and formation parameter acquisition. Especially in the drilling needs of geothermal wells, deep wells, and ultra-deep wells, mud pulse generators are the core component for information transmission in measurement while drilling, and their performance directly determines the stability and timeliness of downhole information transmission.

[0003] Geothermal well drilling environments are highly unique, with downhole temperatures reaching 120℃-200℃ and pressures ranging from 10-40 MPa. The drilling mud contains a large amount of solid particles, including formation sand and gravel, and requires high flow rates and velocities to meet rock-carrying requirements, resulting in severe erosion and wear on the pulse generator. Furthermore, geothermal wells are typically located at depths of 1500-3000 m, necessitating the rapid and precise generation of pressure wave pulses by the pulse generator. The equipment generating the pressure wave must have a response time of less than 5 seconds to achieve real-time feedback of downhole information.

[0004] Existing technological solutions: Currently, most mud pulse generators used in geothermal wells are based on mature products from the oil drilling field, commonly generating pressure wave pulses through the reciprocating shearing action of a shear valve. Performance is optimized by using hard alloy materials for the stator and rotor to improve wear resistance and adding wear-resistant sleeves to protect easily worn parts.

[0005] Existing technical problems: First, there is no effective solution to the slow response problem; second, although wear-resistant rings and hard alloys are used for wear protection, the protection effect is still not ideal, and the erosion and wear of the pulse generator by the mud is still severe.

[0006] The optimized structure of this application improves the wear resistance of the pulse generator, thereby extending its service life and reducing the frequency of replacement. It belongs to the category of special equipment for low-carbon mining technology. Summary of the Invention

[0007] To address the problems in the background technology, this invention provides a fast-response, wear-resistant mud pulse generator. This technical solution solves the core pain points of mud pulse generators under geothermal well conditions through an integrated structural design of "buffer energy storage - self-cleaning - flow diversion and sand removal - active lubrication". It is also compact in structure, easy to maintain, and suitable for confined downhole spaces and harsh working environments.

[0008] The technical solution provided by this invention is: a fast-response, wear-resistant mud pulse generator, comprising a valve seat, an upper disc valve, a lower disc valve, a drive shaft, and a pulse generator housing. The upper disc valve is fixedly installed inside the valve seat, and the lower disc valve is rotatably installed inside the valve seat. The lower end face of the upper disc valve is close to the upper end face of the lower disc valve. The upper disc valve has a mud channel through which mud flows. The lower disc valve has a pulse plate. When the pulse plate aligns with the mud channel, it temporarily blocks the mud channel, preventing mud flow and forming a pulse pressure wave. The drive shaft is intermittently inserted into the pulse generator housing. The drive shaft rotates synchronously with the lower disc valve. The pulse generator housing is fixedly connected to the valve seat and remains stationary. Two magnetic strips A of the same pole are fixedly mounted on the drive shaft. A limiting buffer magnetic strip is fixedly mounted inside the pulse generator housing. After assembly, the limiting buffer magnetic strip is located between the two magnetic strips A. If either magnetic strip A approaches the limiting buffer magnetic strip, the limiting buffer magnetic strip will be positioned between the two magnetic strips A. Magnetic repulsion is generated during the firing of the magnetic strip. This magnetic repulsion acts as a buffer, preventing strong mechanical collisions between the drive shaft and the pulse generator housing. The magnetic repulsion also stores potential energy for the reverse action, making it possible to reduce the pulse response period to less than 5 seconds. A self-cleaning device is located above the upper valve. A through mounting hole is provided axially on the upper valve. The self-cleaning device includes a piston cylinder, filter screen, piston rod, spring, connecting rod mechanism, and fixing plate. The piston cylinder is installed in the mounting hole, and the piston rod is slidably sealed within the piston cylinder. The spring is located between the lower end face of the piston rod and the upper valve. The upper end of the piston rod is hinged to the connecting rod mechanism. The fixing plate and piston cylinder are an integral structure. The upper end of the connecting rod mechanism is hinged to the piston rod, and the lower end of the connecting rod mechanism is hinged to the fixing plate. One side of the filter screen is rotatably mounted on the connecting rod mechanism. The upward and downward movement of the piston rod indirectly drives the retraction and expansion of the filter screen, respectively. Specifically, when the piston rod drives the connecting rod mechanism downwards, the free part of the filter screen is forced to rotate due to contact with the fixed plate, resulting in an upright position. When the piston rod drives the connecting rod mechanism upwards, the free part of the filter screen is forced to rotate due to the impact of the mud, resulting in a retracted position. When the pulse plate temporarily blocks the mud channel, the thrust of the piston rod from the mud is sufficient to overcome the spring force, causing the piston rod to move downwards relative to the piston cylinder. The filter screen is then uprighted, intercepting solid particles in the mud. This prevents solid particles from eroding the upper and lower valve plates and also prevents large particles from entering the mud. The channel becomes blocked; when the pulse plate resets, the mud channel becomes unobstructed, and the piston rod moves upward to reset under the action of the spring, the filter screen is retracted, and the solid particles intercepted on the filter screen are detached from the filter screen under the impact of high-pressure mud, realizing the self-cleaning of the filter screen; the mud channel has a sand discharge trough, and the lower edge of the retracted filter screen is located above the sand discharge trough. Most of the detached solid particles are guided out by the sand discharge trough. The upper end surface of the pulse plate is a guide surface, which is an arc surface or a conical surface, which plays a role in guiding the mud flow and reducing the impact of mud on the lower plate valve, thereby reducing friction damage.

[0009] A further technical solution is as follows: The drive shaft above magnetic strip A is a hollow structure, and a pressure balance compensation piston and a one-way valve are installed inside the hollow structure. The one-way valve is located below the pressure balance compensation piston. The pressure balance compensation piston and the drive shaft are in sliding seal cooperation. The one-way valve only allows lubricating oil to flow from top to bottom. The drive shaft below the one-way valve has an oil passage hole that connects the inside and outside. The lower end of the pulse generator housing is connected to a reducer through a transition joint. Inside the transition joint, the output shaft of the reducer is connected to the drive shaft through a coupling. The lubricating oil flowing out of the oil passage hole passes through the gap between the pulse generator housing and the drive shaft to the gap between the limit buffer magnetic strip and magnetic strip A, to the coupling, to the gap between the transition joint and the coupling, and to the reducer, thus playing a lubricating role.

[0010] A further technical solution is as follows: a hollow axial limiting screw is slidably installed in the center of the lower plate valve. The axial limiting screw is threadedly connected to the drive shaft, thereby preventing the drive shaft from axially disengaging from the lower plate valve. The drive shaft and the lower plate valve are keyed together, so that the rotation of the drive shaft drives the lower plate valve to rotate. After the pulse plate temporarily blocks the mud channel, the mud liquid generates an axial impact on the lower plate valve. In order to reduce the impact, a buffer spring is installed between the lower plate valve and the drive shaft.

[0011] A further technical solution is: a wear-resistant ring is installed inside the valve seat corresponding to the lower plate valve. After the mud flows through the guide surface, it impacts the wear-resistant ring and flows out of the valve seat. The wear-resistant ring serves to protect the valve seat.

[0012] A further technical solution is that the mud channel is an inclined channel.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. Significantly improved response speed: The magnetic repulsion of the same pole magnetic strip A effectively buffers the impact generated by the limit action of the drive shaft, while providing starting assistance, shortening the response time of the pressure wave pulse, and meeting the needs of real-time trajectory control and adjustment of geothermal wells.

[0015] 2. Optimized wear resistance: The flow guiding and sand discharge mechanism works in synergy with the self-cleaning device, and the solid particles work in synergy with the self-cleaning device to effectively intercept and clean solid particles such as mud and sand, reducing the wear of solid particles on the upper and lower valves (stator and rotor), thereby improving the service life of the mud pulse generator.

[0016] 3. Excellent anti-clogging effect: In addition to improving the wear resistance of the mud pulse generator, intercepting solid particles can also effectively prevent mud and sand from clogging the mud pulse generator, ensuring smooth mud flow and improving the clarity of the pressure waves generated by the pulse generator.

[0017] 4. Stable and reliable lubrication and sealing: The pressure balance compensation piston and one-way guide valve realize passive supply and one-way flow of lubricating oil, which can effectively block mud from entering the oil chamber and prevent lubricating oil backflow, thus improving the working stability of components such as reducers and motors. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a perspective view of the valve seat in this invention.

[0020] Figure 3 This is a plan view of the self-cleaning device in this invention.

[0021] Figure 4 This is a perspective view of the self-cleaning device in this invention.

[0022] Figure 5 This is a perspective view of the upper disc valve in this invention.

[0023] Figure 6 This is a perspective view of the lower disc valve in this invention.

[0024] Figure 7 This is a plan view of the lower disc valve in this invention.

[0025] Figure 8 yes Figure 7 Cross-sectional view along the AA direction.

[0026] Figure 9 This is a plan view of the pulse generator housing in this invention.

[0027] Figure 10 yes Figure 9 Cross-sectional view along the BB direction.

[0028] Figure 11 This is a perspective view of the drive shaft in this invention.

[0029] Figure 12 yes Figure 1 Cross-sectional view at point C.

[0030] In the diagram: 1. Salvage head; 2. Valve seat; 201. Threaded hole A; 202. Flow port A; 3. Self-cleaning device; 301. Filter screen; 302. Piston cylinder; 303. Piston rod; 304. Linkage mechanism; 305. Spring; 306. Fixing plate; 4. Upper valve; 401. Mounting hole; 402. Mud channel; 403. Sand discharge trough; 404. Pin positioning hole; 5. Wear ring; 6. Lower valve; 601. Keyway groove; 602. Pulse 7. Lamination; 8. Limit key; 9. Pulse generator housing; 10. Limit buffer magnetic strip; 11. Threaded hole B; 12. Flow port B; 13. Drive shaft; 14. Magnetic strip A; 15. Oil passage hole; 16. Keyway; 17. Transition joint; 18. Coupling; 19. Reducer; 10. Magnetic drive coupler; 10. One-way guide valve; 11. Pressure balance compensation piston; 12. Buffer spring; 13. Axial limit screw; 14. Needle roller bearing. Detailed Implementation

[0031] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] This embodiment includes a valve seat 2, an upper disc valve 4, a lower disc valve 6, a drive shaft 9, and a pulse generator housing 8. The valve seat 2 is a housing, with its upper end fixedly connected to the retrieval head 1. The upper disc valve 4 is fixedly installed inside the valve seat 2, and the lower disc valve 6 is rotatably installed inside the valve seat 2. The lower end face of the upper disc valve 4 is close to the upper end face of the lower disc valve 6. The upper disc valve 4 has a mud channel 402 through which mud flows. The lower disc valve 6 has a pulse plate 602. When the pulse plate 602 is aligned with the mud channel 402, it temporarily blocks the mud channel 402, preventing mud flow and forming a pulse pressure wave. The drive shaft 9 is inserted into the pulse generator housing 8 with a clearance. A needle roller bearing 18 is provided between the drive shaft 9 and the pulse generator housing 8 to reduce friction between them. The drive shaft 9 rotates synchronously with the lower valve 6. The pulser housing 8 has four threaded holes B802, and the valve seat 2 also has four threaded holes A201. The positions of the four threaded holes B802 and A201 are one-to-one. The pulser housing 8 and the valve seat 2 are fixedly connected by four bolts or screws. The valve seat 2 has a flow port A202, and the pulser housing 8 has a flow port B803. The positions of the flow ports A202 and B803 are corresponding. The mud flows out of the valve seat 2 through the flow ports A202 and B803.

[0033] One of the innovative aspects of this embodiment is: Figure 12As shown, two magnetic strips A901 with the same poles are fixedly connected to the drive shaft 9 (for example, the S poles of both magnetic strips A901 are located on the left and the N poles are located on the right). A limiting buffer magnetic strip 801 is fixedly connected inside the pulse generator housing 8 (following the above example, the S poles of the limiting buffer magnetic strip 801 are located on the right and the N poles are located on the left). The limiting buffer magnetic strip 801 is located between the two magnetic strips A901. When either magnetic strip A901 approaches the limiting buffer magnetic strip 801, a magnetic repulsive force is generated, and the magnetic repulsive force plays a buffering role. To avoid strong mechanical collisions and impacts between the drive shaft 9 and the pulser housing 8 when the drive shaft 9 rotates, the magnetic repulsion also stores potential energy for the reverse movement of the drive shaft 9, thus shortening the response time of the reverse movement of the drive shaft 9, which in turn shortens the response time of the pressure wave pulse. By selecting the magnetic strength of the magnetic strip A901 (the greater the magnetic strength of the magnetic strip A901, the greater the repulsion, the greater the stored potential energy, and the shorter the response time of the side pressure wave pulse), this application can reduce the pulse response cycle to less than 5 seconds, meeting the needs of real-time trajectory control and adjustment of geothermal wells.

[0034] The second innovation of this embodiment is: Figure 1 , 3 As shown in Figures 4 and 5, the upper disc valve 4 has a self-cleaning device 3 above it, and a through mounting hole 401 is provided axially on the upper disc valve 4. The self-cleaning device 3 includes a piston cylinder 302, a filter screen 301, a piston rod 303, a spring 305, a connecting rod mechanism 304, and a fixing plate 306. The piston cylinder 302 is spirally installed in the mounting hole 401, and the piston rod 303 is slidably sealed in the piston cylinder 302. The spring 305 is located between the lower end face of the piston rod 303 and the upper disc valve 4. Under the action of the spring 305, the piston rod 303 has an upward movement tendency relative to the piston cylinder 302. The fixing plate 306 is integrally formed with the piston cylinder 302. The upper end of the linkage structure 304 is hinged to the piston rod 303, and the lower end of the linkage mechanism 304 is hinged to the fixed plate 306. One side of the filter screen 301 is rotatably mounted on the linkage mechanism 304 (for example, one side of the filter screen 301 and one side of the linkage mechanism 304 are hinged). The filter screen 301 away from the linkage mechanism 304 is in a free state but is in contact with the fixed plate 306 under its own weight. The upward and downward movement of the piston rod 303 indirectly drives the filter screen 301 to retract and extend, respectively. Figure 4The diagram shows two states of the filter screen 301: raised and retracted. When the pulse plate 602 temporarily blocks the mud channel 402, the piston rod 303 experiences increased thrust from the mud, causing it to move downwards relative to the piston cylinder 302 (spring 305 is compressed). This drives the connecting rod mechanism 304 to move downwards, and the filter screen 301 follows the connecting rod mechanism 304 downwards. As the filter screen 301 comes into contact with the fixed plate 306, it is forced to rotate relative to the connecting rod mechanism 304, ultimately reaching the raised state. The raised filter screen 301 then acts as a filter to intercept solid particles in the mud. When the pulse plate 602 is reset, the mud channel 402 is unobstructed, and the elastic potential energy stored in the compressed spring 305 needs to be released. Therefore, under the action of the spring 305, the piston rod 303 moves upward to reset, driving the connecting rod mechanism 304 to move upward. The filter screen 301 moves upward with the connecting rod mechanism 304. At this time, the filter screen 301 on the side away from the connecting rod mechanism 304 rotates downward under its own gravity and the impact force of the mud. The filter screen 301 is in a retracted state. After the filter screen 301 is retracted, the solid particles on the filter screen 301 are detached under the high flow rate impact of the high-pressure mud, achieving self-cleaning. Furthermore, since the mud channel 402 contains a sand discharge trough 403, the lower edge of the retracted filter screen 301 is located directly above the sand discharge trough 403. Most of the solid particles are guided out by the sand discharge trough 403. The upper surface of the pulse plate 602 is designed as a guide surface, and the sand discharged from the sand discharge trough 403 falls onto the guide surface. The guide surface is an arc surface or a conical surface, which guides the flow of mud and gravel. The guiding effect of the sand discharge trough 403 gives most of the gravel a definite direction, greatly reducing the amount of gravel that directly impacts the lower plate valve 6 vertically, thereby reducing the erosion and friction damage to the lower plate valve 6. The self-cleaning device 3 works in conjunction with the guide and sand discharge mechanism, and the solid particles work in conjunction with the self-cleaning device 3 to effectively intercept and clean solid particles such as mud and sand, reducing the wear of solid particles on the upper plate valve 4 and the lower plate valve 6, thereby improving the service life of the mud pulse generator. With the self-cleaning device 3 installed, the anti-clogging effect is particularly outstanding. Because the filter screen 301 intercepts most solid particles, there is no accumulation of solid particles in the mud channel 402 of the upper valve 4, effectively preventing mud and sand from clogging the mud pulse generator and ensuring smooth mud flow. Due to the absence of clogging, the pressure waves generated by the pulse generator are clearer.

[0035] The valve seat 2 corresponding to the lower plate valve 6 is provided with a wear-resistant ring 5. After the mud flows through the guide surface, it impacts the wear-resistant ring 5 and flows out of the valve seat 2. The wear-resistant ring 5 serves to protect the valve seat 2.

[0036] The third innovation of this embodiment: Figure 1 As shown, a hollow axial limiting screw 17 is slidably disposed in the center of the lower disc valve 6. The axial limiting screw 17 is threadedly connected to the drive shaft 9, thereby preventing the drive shaft 9 from axially disengaging from the lower disc valve 6. The drive shaft 9 and the lower disc valve 6 are keyed together. Specifically, Figure 8In the middle, the lower plate valve 6 has a keyed slide groove 601. Figure 10 In the middle, the drive shaft 9 has a keyway 903. Figure 1 In the keyway 903, a limiting key 7 is fixedly installed. The limiting key 7 slides within the keyway 601, thereby restricting the rotation between the drive shaft 9 and the lower valve 6, forcing the rotation of the drive shaft 9 to drive the lower valve 6 to rotate. Because the pulse plate 602 temporarily blocks the mud channel 402, the pressure of the mud liquid generates an axial impact on the lower valve 6. To reduce this impact, a buffer spring 16 is provided between the lower valve 6 and the drive shaft 9.

[0037] The fourth innovation of this embodiment: The drive shaft 9 above the magnetic strip A901 is a hollow structure. Inside the hollow structure are a pressure balance compensation piston 15 and a one-way valve 14. The one-way valve 14 is located below the pressure balance compensation piston 15. The chamber between the pressure balance compensation piston 15 and the one-way valve 14 is filled with lubricating oil. The pressure balance compensation piston 15 and the drive shaft 9 are in a sliding seal fit. The one-way valve 14 only allows lubricating oil to pass through from top to bottom. The drive shaft 9 below the one-way valve 14 has an oil passage 902 connecting the inside and outside. The upper end of the pressure balance compensation piston 15 is affected by the mud liquid. The pressure pushes the fluid downwards, forcing lubricating oil through a one-way valve and oil passage 902. The lower end of the pulser housing 8 is connected to a reducer 12 via a transition joint 10 (the transition joint 10 is a commercially available product). Inside the transition joint 10, the output shaft of the reducer 12 is connected to the drive shaft 9 via a coupling 11. The lubricating oil passively squeezed out through the oil passage 902 passes through the gap between the pulser housing 8 and the drive shaft 9, reaching the space between the limit buffer magnetic strips 801 and A901, then the coupling 11, and finally the gap between the transition joint 10 and the coupling 11, reaching the reducer 12, thus providing lubrication. The pressure balance compensation piston 15 effectively prevents mud from entering the oil chamber, and the one-way guide valve 14 prevents lubricating oil backflow, improving the operational stability of components such as the reducer 12 and the motor. The motor controlled by the circuit board (the motor and circuit board are omitted in the figure) is connected to the magnetic drive coupler 13. The motor drives the magnetic drive coupler 13, which in turn drives the reducer 12. The reducer 12 then drives the coupling 11, and finally the coupling 11 drives the drive shaft 9.

[0038] like Figure 1 As shown, the mud channel 402 is an inclined channel. Compared with the axial mud channel 402, the inclined mud channel 402, in conjunction with the arc surface or conical surface of the guide surface, achieves a more efficient guide effect and can further reduce the erosion on the upper surface of the lower plate valve 6.

[0039] In this embodiment, the lower end of the upper disc valve 4 has a pin positioning hole 404, and the upper disc valve 4 and the valve seat 2 are limited by a pin.

[0040] In summary, this embodiment solves the core pain points of mud pulse generators under geothermal well conditions by integrating "buffer energy storage, self-cleaning, flow diversion and sand removal, and active lubrication" into a single structural design. It also features a compact structure, convenient maintenance, and suitability for confined downhole spaces and harsh working environments.

[0041] This technology has extremely broad cross-domain application prospects, especially in the context of the accelerated large-scale development of medium-deep geothermal resources (1500-4000 meters) in China and the extension of global oil and gas exploration to deep wells, ultra-deep wells (3000-6000 meters) and complex lithological formations. As a core signal transmission equipment that integrates rapid response and strong wear resistance, it can accurately solve common industry problems such as pulse generator signal delay, valve group erosion failure, and solid particle blockage under high sand content and high vibration conditions in geothermal wells and high temperature, high pressure and high salinity conditions in oil and gas wells. It can significantly improve the real-time performance and stability of downhole information transmission, reduce non-working time (NPT) and avoid the risk of major downhole accidents. With the continuous iteration of intelligent technologies for clean energy and oil and gas resource development, this solution innovatively integrates a buffer energy storage magnet drive mechanism, a flow-guiding and sand-discharging-self-cleaning integrated structure, and a pressure balance compensation lubrication system. This not only directly adapts to the measurement-while-drilling (MWD) scenarios of medium-deep geothermal wells and hot dry rock exploration wells, but also seamlessly extends to signal transmission operations in complex drilling environments such as deep / ultra-deep oil and gas wells, coalbed methane wells, and shale gas wells. Furthermore, it can serve as a general-purpose pulse generation platform resistant to harsh working conditions, enabling dynamic adjustment of downhole trajectories and real-time monitoring of formation parameters in related fields. By upgrading traditional passive protection to a multi-dimensional collaborative design of "response acceleration + active wear prevention + intelligent unblocking + stable lubrication," this technology is expected to become a core standard component of MWD systems in future complex formation energy development. It provides key technical support for promoting efficient geothermal and oil and gas resource development and achieving cost reduction and efficiency improvement in drilling engineering, possessing extremely high industrial promotion value and significant economic and social benefits.

Claims

1. A fast-response, wear-resistant mud pulse generator, comprising a valve seat (2), an upper disc valve (4), a lower disc valve (6), a drive shaft (9), and a pulse generator housing (8), wherein the upper disc valve (4) is fixedly disposed within the valve seat (2), and the lower disc valve (6) is rotatably disposed within the valve seat (2), the upper disc valve (4) having a mud channel (402), and the lower disc valve (6) having a pulse plate (602), characterized in that: The drive shaft (9) rotates synchronously with the lower plate valve (6). The pulse generator housing (8) is fixedly connected to the valve seat (2). Two magnetic strips A (901) with the same poles are fixedly connected on the drive shaft (9). A limiting buffer magnetic strip (801) is fixedly connected inside the pulse generator housing (8). The limiting buffer magnetic strip (801) is located between the two magnetic strips A (901). When either magnetic strip A (901) approaches the limiting buffer magnetic strip (801), a magnetic repulsion force is generated. The upper plate valve (4) is equipped with a self-cleaning device (3). The upper plate valve (4) is provided with a through mounting hole (401) in the axial direction. The self-cleaning device (3) includes a piston cylinder (302), a filter screen (301), a piston rod (303), a spring (305), a connecting rod mechanism (304), and a fixing plate (306). The piston cylinder (302) is installed in the mounting hole (401), and the piston rod (303) slides. Sealed inside the piston cylinder (302), the spring (305) is located between the lower end face of the piston rod (303) and the upper disc valve (4). The fixed plate (306) is integrally connected to the piston cylinder (302). The upper end of the linkage mechanism (304) is hinged to the piston rod (303), and the lower end of the linkage mechanism (304) is hinged to the fixed plate (306). One side of the filter screen (301) is rotatably mounted on the linkage mechanism (304). The filter screen (301) away from the linkage mechanism (304) is in a free state but is in contact with the fixed plate (306) due to its own gravity. The upward and downward movement of the piston rod (303) indirectly drives the filter screen (301) to retract and lift. The mud channel (402) has a sand discharge groove (403). The lower edge of the retracted filter screen (301) is located above the sand discharge groove (403). The upper end face of the pulse plate (602) has a guide surface.

2. The fast-response, wear-resistant mud pulse generator according to claim 1, characterized in that: The drive shaft (9) above the magnetic strip A (901) is a hollow structure. Inside the hollow structure, there is a pressure balance compensation piston (15) and a one-way valve (14). The one-way valve (14) is located below the pressure balance compensation piston (15). The pressure balance compensation piston (15) and the drive shaft (9) are in sliding seal cooperation. The one-way valve (14) only allows lubricating oil to flow from top to bottom. The drive shaft (9) below the one-way valve (14) has an oil passage hole (902). The lower end of the pulse generator housing (8) is connected to the reducer (12) through a transition joint (10). Inside the transition joint (10), the output shaft of the reducer (12) is connected to the drive shaft (9) through a coupling (11). The lubricating oil flowing out of the oil passage hole (902) can reach the inside of the transition joint (10), the coupling (11) and the reducer (12).

3. The fast-response, wear-resistant mud pulse generator according to claim 1, characterized in that: A hollow axial limiting screw (17) is slidably provided in the center of the lower plate valve (6). The axial limiting screw (17) is threadedly connected to the drive shaft (9), thereby restricting the axial separation of the drive shaft (9) from the lower plate valve (6). The drive shaft (9) and the lower plate valve (6) are connected by a key, so that the rotation of the drive shaft (9) drives the lower plate valve (6) to rotate. A buffer spring (16) is provided between the lower plate valve (6) and the drive shaft (9).

4. A fast-response, wear-resistant mud pulse generator according to claim 1, characterized in that: The mud channel (402) is an inclined channel.

5. A fast-response, wear-resistant mud pulse generator according to claim 1, characterized in that: A wear-resistant ring (5) is provided inside the valve seat (2) corresponding to the lower plate valve (6).

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