A middle-through circular pipe type power short section assembly and a hydraulic oscillator

Abstract

The application discloses a middle-through pipe type power short joint assembly and a hydraulic oscillator, relates to the field of oil drilling and production technology, and comprises a cap-shaped upper static sleeve and a middle-through rotor shaft. The cap-shaped upper static sleeve separates the top opening of the bypass rotor shaft and high-pressure water flow. The lower part of the middle-through rotor shaft is provided with a middle-through pipe along an axis. The middle-through pipe is connected with the upper part of the middle-through rotor shaft and the bottom end surface of the middle-through rotor shaft. The power short joint assembly and the hydraulic oscillator can make the improved rotor shaft not generate axial force or generate very small axial force, and reduce the friction force between the lower end of the improved rotor shaft and the static valve piece.

Description

Technical Field

[0001] This application relates to the field of oil drilling and production technology, specifically to a centrally located circular tube type power short section assembly and a hydraulic oscillator. Background Technology

[0002] With the development of petroleum exploration technology, in order to improve the recovery rate and increase oil and gas field production, and to adapt to the complex well structure of horizontal wells, lateral wells, extended reach wells, and multi-branch horizontal wells with high extraction difficulty, these wells have complex wellbore trajectories and high friction between the drill string and the well wall rock. This causes phenomena such as drill string pressure and stuck drill during the drilling process, resulting in low drilling efficiency and long development cycles. Especially during sliding drilling, the drill string and the well wall rock are in a relatively static state, and the static friction is much greater than the dynamic friction. This increases the resistance to lowering the drill string, which reduces the drilling pressure applied to the drill bit through the drill string. As a result, the mechanical drilling rate is lower, the drilling cycle is longer, and the drilling cost is increased, which seriously restricts the development of horizontal wells, lateral wells, and extended reach wells.

[0003] To address the numerous problems caused by excessive friction between the drill string and the wellbore, extensive research has been conducted both domestically and internationally on drill string vibration drag reduction technology, leading to the development of turbine hydraulic oscillators. The hydraulic oscillator comprises a power subassembly and an oscillation subassembly. The oscillation subassembly is mounted on top of the power subassembly. The power subassembly generates a pressure difference, while the oscillation subassembly converts this pressure difference into vibration. The power subassembly of the hydraulic oscillator is as follows: Figures 1 to 6 As shown, high-pressure liquid enters from the inlet of the hydraulic oscillator and flows into the turbine assembly (the turbine stator 6 and turbine rotor 5 constitute the turbine assembly) through the open upper stationary sleeve 3. The turbine assembly drives the primary rotor shaft 7 to rotate. An eccentric hole is machined at the lower end of the primary rotor shaft 7, which contacts a single-hole stationary valve plate 9 with an eccentric hole. The single-hole stationary valve plate 9 bears the axial force generated by the primary rotor shaft 7 and the turbine assembly. As the primary rotor shaft 7 rotates, the eccentric hole at the lower end of the primary rotor shaft 7 and the eccentric hole on the single-hole stationary valve plate 9 form a channel with changing flow area, thereby generating pressure fluctuations.

[0004] However, since the pressure at the upper end of the original rotor shaft 7 is much higher than that at the lower end, the original rotor shaft 7 will generate a large downward axial force. The friction between the lower end of the original rotor shaft 7 and the single-hole static valve plate 9 will also be very large. The large friction will not only cause the original rotor shaft 7 to rotate slower and slower or even become unable to rotate, but will also greatly shorten the service life of the single-hole static valve plate 9. Summary of the Invention

[0005] In view of the deficiencies in the existing technology, the purpose of this application is to provide a centrally located circular tube type power short section assembly and hydraulic oscillator, so that the rotor shaft does not generate axial force or generates very small axial force, thereby reducing the friction between the lower end of the rotor shaft and the stationary valve plate.

[0006] To achieve the above objectives, the technical solution adopted is: a centrally located circular tube type power short section assembly, including a cap-shaped upper stationary sleeve and a centrally located rotor shaft. The cap-shaped upper stationary sleeve separates the top opening of the bypass rotor shaft from the high-pressure water flow. A centrally located tube is arranged along the axis at the lower part of the centrally located rotor shaft, and the centrally located tube connects the upper part of the centrally located rotor shaft and the bottom end face of the centrally located rotor shaft.

[0007] Based on the above technical solution, the central rotor shaft includes a hollow upper part and a hollow lower part separated from each other. The top opening of the central tube is connected to the hollow upper part, and its bottom opening passes through the constant overlapping area of ​​the eccentric hole of the static valve plate and the eccentric hole of the central rotor shaft.

[0008] The cap-shaped upper static sleeve includes an upwardly extending cap that separates the hollow upper opening from the high-pressure water flow.

[0009] Based on the above technical solution, the central rotor shaft also includes a transverse partition, which separates the upper hollow part and the lower hollow part; the top opening of the central tube is located in the center of the transverse partition.

[0010] Based on the above technical solution, the power sub-section assembly also includes a lower stationary sleeve fixed to the housing, and the lower stationary sleeve and the lower moving sleeve fixedly sleeved in the lower part of the hollow structure form sliding bearings for the high-pressure zone above the partition and the low-pressure zone below the partition.

[0011] Based on the above technical solution, the stationary valve plate is a multi-hole stationary valve plate, and a number of auxiliary connecting holes are provided around the eccentric hole of the multi-hole stationary valve plate; the auxiliary connecting holes are adjacent to the circumferential surface of the central rotor shaft.

[0012] Based on the above technical solution, an annular channel is formed between the lower static sleeve of the partition and the porous static valve plate, and the annular channel connects all the auxiliary connecting holes; there are four auxiliary connecting holes, which are evenly distributed at equal angles along the axis of the porous static valve plate 15; the annular channel connects to all the auxiliary connecting holes.

[0013] This application also discloses a hydraulic oscillator, comprising:

[0014] The aforementioned powertrain short section assembly;

[0015] An oscillating sub-section assembly is installed above the upper connector of the power sub-section assembly; the oscillating sub-section assembly converts the pressure difference generated by the continuous change of the matching area between the eccentric hole at the bottom end of the central rotor shaft of the power sub-section assembly and the eccentric hole of the multi-hole stationary valve plate into vibration.

[0016] Based on the above technical solution, the central rotor shaft includes a hollow upper part and a hollow lower part separated from each other. The top opening of the central tube is connected to the hollow upper part, and its bottom opening passes through the constant overlapping area of ​​the eccentric hole of the static valve plate and the eccentric hole of the central rotor shaft.

[0017] The cap-shaped upper static sleeve includes an upwardly extending cap that separates the hollow upper opening from the high-pressure water flow.

[0018] Based on the above technical solution, the power sub-section assembly also includes a lower stationary sleeve fixed to the housing, and the lower stationary sleeve and the lower moving sleeve fixedly sleeved in the lower part of the hollow structure form sliding bearings for the high-pressure zone above the partition and the low-pressure zone below the partition.

[0019] Based on the above technical solution, the stationary valve plate is a multi-hole stationary valve plate, and a number of auxiliary connecting holes are provided around the eccentric hole of the multi-hole stationary valve plate; the auxiliary connecting holes are adjacent to the circumferential surface of the central rotor shaft.

[0020] The beneficial effects of the technical solution provided in this application include:

[0021] The proposed central-tube type power short section assembly and hydraulic oscillator have a simple structure. Compared to known structures, only a few parts have been improved and optimized. The main improvements are to the open upper stationary sleeve, replacing it with a cap-shaped upper stationary sleeve; to the original rotor shaft, replacing it with a central-tube rotor shaft; and to the connecting lower stationary sleeve, replacing it with a separating lower stationary sleeve. In the improved structure, the cap of the cap-shaped upper stationary sleeve isolates the hollow upper part of the central-tube rotor shaft from the high-pressure water flow, ensuring that the interior of the hollow upper part remains a low-pressure zone. The central tube connects the interior of the hollow upper part, the bottom end face of the central-tube rotor shaft, and the outlet. These three locations have equal pressure and are all in low-pressure zones, which greatly reduces the downward axial force on the central-tube rotor shaft. This results in the central-tube rotor shaft generating no downward axial force or generating very little axial force, further reducing the friction between the bottom end face of the central-tube rotor shaft and the stationary valve plate, and increasing the service life of the stationary valve plate. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a general structural diagram of a currently known pressure fluctuation device;

[0024] Figure 2 for Figure 1 A schematic diagram of the open upper static sleeve in the middle;

[0025] Figure 3 for Figure 2 Top view;

[0026] Figure 4 for Figure 1A schematic diagram of a single-hole static valve plate;

[0027] Figure 5 for Figure 4 Top view;

[0028] Figure 6 for Figure 1 A schematic diagram of the original rotor shaft;

[0029] Figure 7 This is an overall structural diagram of the pressure fluctuation device provided in the first embodiment of this application;

[0030] Figure 8 This is an overall structural diagram of the pressure fluctuation device provided in the second embodiment of this application;

[0031] Figure 9 for Figure 7 or Figure 8 A schematic diagram of the cap-shaped static sleeve in the middle;

[0032] Figure 10 for Figure 9 Top view;

[0033] Figure 11 for Figure 7 or Figure 8 A schematic diagram of the lower static sleeve of the partition in the middle;

[0034] Figure 12 for Figure 7 or Figure 8 A schematic diagram of the porous static valve plate in the diagram;

[0035] Figure 13 for Figure 12 Top view;

[0036] Figure 14 for Figure 7 or Figure 8 A schematic diagram of the bypass rotor shaft in the diagram;

[0037] Reference numerals: 1. Upper connector; 2. Pressure cap; 3. Open upper stationary sleeve; 4. Upper moving sleeve; 5. Turbine rotor; 6. Turbine stator; 7. Original rotor shaft; 8. Spacer; 9. Single-hole stationary valve plate; 10. Housing; 11. Lower connector; 17. Lower moving sleeve; 18. Connecting lower stationary sleeve; 12. Hat-shaped upper stationary sleeve; 121. Cap; 16. Central rotor shaft; 161. Central pipe; 162. Hollow upper part; 163. Hollow lower part; 164. Transverse partition; 14. Partition lower stationary sleeve; 15. Multi-hole stationary valve plate; 19. Inlet; 20. Rotor shaft port area; 21. Outlet; 151. Auxiliary connecting hole. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application 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 invention and are not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figures 7 to 14 As shown, this application discloses an embodiment of a centrally located circular tube-type power sub-assembly, comprising a cap-shaped upper stationary sleeve 12 and a centrally located rotor shaft 16. The cap-shaped upper stationary sleeve 12 separates the top opening of the bypass rotor shaft 13 from the high-pressure water flow. A centrally located pipe 161 is arranged along the axis at the lower part of the centrally located rotor shaft 16, connecting the upper part of the centrally located rotor shaft 16 and the bottom end face of the centrally located rotor shaft 16. That is, the upper part of the centrally located rotor shaft 16 and the bottom end face of the centrally located rotor shaft 16 are connected through the centrally located pipe 161, and both are in a low-pressure area, which greatly reduces the downward axial force of the centrally located rotor shaft 16, so that the bypass rotor shaft 13 does not generate axial force or generates very little axial force.

[0040] In one embodiment, the central rotor shaft 16 includes a spaced-apart hollow upper portion 132 and hollow lower portion 133. The top opening of the central tube 161 is connected to the hollow upper portion 132, and its bottom opening is located on the circumferential surface of the hollow lower portion 133. The bottom opening passes through the constant overlap area between the eccentric hole of the stationary valve plate and the eccentric hole of the central rotor shaft 16. The central tube 161 does not interfere with the rotational movement of the central rotor shaft 16.

[0041] The cap-shaped upper stationary sleeve 12 includes an upwardly extending cap 121. The cap-shaped upper stationary sleeve 12 adds a cap 121 compared to the original open upper stationary sleeve 3. The cap 121 separates the opening of the hollow upper part 132 from the high-pressure water flow, so that the interior of the hollow upper part 132 remains a low-pressure area.

[0042] The power short section assembly of this application has a cleverly designed cap 121 that changes the hollow upper part 132, which should originally belong to the high-pressure area, into a low-pressure area, and makes the pressure on both sides of the hollow lower part 133 equal, thereby reducing the downward axial force of the central rotor shaft 16.

[0043] Furthermore, the central rotor shaft 16 also includes a transverse partition 134, which separates the hollow upper part 132 and the hollow lower part 133. The overall structure of the central rotor shaft 16 is basically the same as that of a conventional rotor shaft. The difference is that a central tube 161 is arranged downward along the axis in the hollow lower part 163. The top opening of the central tube 161 is located at the center of the transverse partition 164.

[0044] Furthermore, the lower stationary sleeve 14 is fixed to the housing 10. The lower stationary sleeve 14 and the lower moving sleeve 17 form a sliding bearing. The lower moving sleeve 17 is fitted and fixed to the hollow lower part 163. The lower stationary sleeve 14 is rotatably fitted onto the lower moving sleeve 17. The sliding bearing isolates the upper high-pressure area and the lower low-pressure area.

[0045] Specifically, when the central rotor shaft 16 rotates, the lower moving sleeve 17 is fixed relative to the central rotor shaft 16 and rotates together with the central rotor shaft 16, while the lower stationary sleeve 14 is relatively fixed to the housing 10 and remains stationary. The lower stationary sleeve 14, relative to the original connecting lower stationary sleeve 18, closes all bypass holes.

[0046] Similarly, the upper moving sleeve 4 and the cap-shaped upper stationary sleeve 12 have the same matching relationship. The upper moving sleeve 4 and the cap-shaped upper stationary sleeve 12 form a sliding bearing with a very small gap between them. The upper moving sleeve 4 is fixed to the central rotor shaft 16, and the cap-shaped upper stationary sleeve 12 is fixed to the housing 10.

[0047] The power short section assembly of this application has a simple structure. Compared with the known structure, only a few parts have been improved and optimized. The main improvements are to the open upper stationary sleeve 3, which is replaced by a cap-shaped upper stationary sleeve 12; the original rotor shaft 7, which is replaced by a through rotor shaft 16; and the connecting lower stationary sleeve 18, which is replaced by a blocking lower stationary sleeve 14. In the improved structure, the cap 121 of the cap-shaped upper stationary sleeve 12 blocks the hollow upper part 162 of the through rotor shaft 16 from the high-pressure water flow, so that the interior of the hollow upper part 162 remains a low-pressure area. The through pipe 161 connects the interior of the hollow upper part 162, the bottom end face of the through rotor shaft 16, and the outlet 21. The pressure at these three locations is equal and all belong to the low-pressure area, which greatly reduces the downward axial force of the through rotor shaft 16. This means that the through rotor shaft 16 does not generate a downward axial force or generates a very small axial force, further reducing the friction between the bottom end face of the through rotor shaft 16 and the stationary valve plate, and increasing the service life of the stationary valve plate.

[0048] Specifically, the rotor shaft port area 20 and the outlet 21 both belong to the low-pressure zone.

[0049] In another embodiment, based on the above technical solution, the stationary valve plate adopts a porous stationary valve plate 15, from... Figure 1 The single-hole static valve plate 9 was improved into Figure 12 The multi-hole static valve plate 15 has several auxiliary connecting holes 151 around its perimeter, which are adjacent to the circumferential surface of the central rotor shaft 16. The auxiliary connecting holes 151 allow the multi-hole static valve plate 15 to connect to the outlet 21 over a larger area, so that the bottom end of the central rotor shaft 16 is surrounded by a low-pressure zone, reducing the axial pressure on the central rotor shaft 16.

[0050] Furthermore, an annular channel is formed between the lower stationary sleeve 14 and the porous stationary valve plate 15, and the bottom opening of the central tube 161 connects to the bottom of the porous stationary valve plate 15. The annular channel connects all the auxiliary connecting holes 151. The two ends of the central tube 161, the annular channel, and the bottom end face of the central rotor shaft are all in the low-pressure area, reducing the axial force of the central rotor shaft.

[0051] To ensure that the bottom end face of the central rotor shaft 16 and the porous stationary valve plate 15 do not separate, and to ensure that the central rotor shaft 16 is subjected to a small downward axial force, the inner hole size between the cap-shaped upper stationary sleeve 12 and the partition lower stationary sleeve 14 must be calculated so that the inner hole size between the cap-shaped upper stationary sleeve 12 is slightly smaller than the inner hole size between the partition lower stationary sleeve 14.

[0052] Furthermore, there are four auxiliary connecting holes 151, which are evenly distributed at equal angles along the axis of the porous static valve plate 15, with each pair of holes being 90 degrees apart; the annular channel connects to all the auxiliary connecting holes 151.

[0053] It is worth noting that the modification of the power short section assembly in this application is simple. The main changes are to change the open upper stationary sleeve 3 to a hat-shaped upper stationary sleeve 12, change the original rotor shaft 7 to a through rotor shaft 16, change the connecting lower stationary sleeve 18 to a blocking lower stationary sleeve 14, and change the single-hole stationary valve plate 9 to a multi-hole stationary valve plate 15. For structures not mentioned, the original structure is kept unchanged.

[0054] This application also discloses an embodiment of a hydraulic oscillator, which includes the aforementioned power sub-assembly and an oscillation sub-assembly, with the oscillation sub-assembly mounted above the upper connector 1 of the power sub-assembly. The oscillation sub-assembly converts the pressure difference of the power sub-assembly into vibration. Specifically, when the central rotor shaft 16 rotates, the matching area between the eccentric hole at the bottom of the central rotor shaft 16 and the eccentric hole of the porous stationary valve plate 15 continuously changes, generating a pressure difference.

[0055] During this process, while the rotor shaft 16 vibrates normally, both ends of the shaft are in a low-pressure zone, which reduces the axial pressure on the rotor shaft 16.

[0056] Regarding the hydraulic oscillator, in one embodiment, the central rotor shaft 16 includes a spaced-apart hollow upper portion 132 and hollow lower portion 133. The top opening of the central tube 161 communicates with the hollow upper portion 132, and its bottom opening is located on the circumferential surface of the hollow lower portion 133. The bottom opening passes through the constant overlap area between the eccentric hole of the stationary valve plate and the eccentric hole of the central rotor shaft 16. The central tube 161 does not interfere with the rotational movement of the central rotor shaft 16. The cap-shaped upper stationary sleeve 12 includes an upwardly extending cap 121, which is added to the original open upper stationary sleeve 3. The cap 121 separates the opening of the hollow upper portion 132 from the high-pressure water flow, so that the interior of the hollow upper portion 132 remains a low-pressure area.

[0057] Regarding the hydraulic oscillator, further, the lower stationary sleeve 14 is fixed to the housing 10, the lower stationary sleeve 14 and the lower moving sleeve 17 form a sliding bearing, the lower moving sleeve 17 is fitted and fixed to the hollow lower part 163, the lower stationary sleeve 14 is rotatably fitted to the lower moving sleeve 17, and the sliding bearing isolates the upper high pressure area and the lower low pressure area.

[0058] Specifically, when the central rotor shaft 16 rotates, the lower moving sleeve 17 is fixed relative to the central rotor shaft 16 and rotates together with the central rotor shaft 16, while the lower stationary sleeve 14 is relatively fixed to the housing 10 and remains stationary. The lower stationary sleeve 14, relative to the original connecting lower stationary sleeve 18, closes all bypass holes.

[0059] Regarding the hydraulic oscillator, based on the above technical solution, the stationary valve plate adopts a porous stationary valve plate 15, from... Figure 1 The single-hole static valve plate 9 was improved into Figure 12 The multi-hole static valve plate 15 has several auxiliary connecting holes 151 around its perimeter, which are adjacent to the circumferential surface of the central rotor shaft 16. The auxiliary connecting holes 151 allow the multi-hole static valve plate 15 to connect to the outlet 21 over a larger area, so that the bottom end of the central rotor shaft 16 is surrounded by a low-pressure zone, reducing the axial pressure on the central rotor shaft 16.

[0060] Furthermore, an annular channel is formed between the lower stationary sleeve 14 and the porous stationary valve plate 15, and the bottom opening of the central tube 161 connects to the bottom of the porous stationary valve plate 15. The annular channel connects all the auxiliary connecting holes 151. The two ends of the central tube 161, the annular channel, and the bottom end face of the central rotor shaft are all in the low-pressure area, reducing the axial force of the central rotor shaft.

[0061] Furthermore, there are four auxiliary connecting holes 151, which are evenly distributed at equal angles along the axis of the porous static valve plate 15, with each pair of holes being 90 degrees apart; the annular channel connects to all the auxiliary connecting holes 151.

[0062] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0063] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A centrally located circular tube type power sub-assembly, characterized in that, It includes a cap-shaped upper stationary sleeve (12) and a central through rotor shaft (16). The cap-shaped upper stationary sleeve (12) separates the top opening of the central through rotor shaft (16) from the high-pressure water flow. A central through pipe (161) is provided along the axis at the lower part of the central through rotor shaft (16). The central through pipe (161) connects the upper part of the central through rotor shaft (16) and the bottom end face of the central through rotor shaft (16). The central rotor shaft (16) includes a hollow upper part (162) and a hollow lower part (163) separated from each other. The top opening of the central tube (161) is connected to the hollow upper part (162), and its bottom opening passes through the constant overlap area of ​​the eccentric hole of the stationary valve plate and the eccentric hole of the central rotor shaft (16). The cap-shaped upper static sleeve (12) includes an upwardly extending cap (121) that separates the hollow upper part (162) opening from the high-pressure water flow; The central rotor shaft (16) also includes a transverse partition (164) that separates the upper hollow part (162) and the lower hollow part (163); the top opening of the central tube (161) is located at the center of the transverse partition (164); The stationary valve plate is a multi-hole stationary valve plate (15), and several auxiliary connecting holes (151) are provided around the eccentric hole of the multi-hole stationary valve plate (15); the auxiliary connecting holes (151) are adjacent to the circumferential surface of the central rotor shaft (16).

2. The power sub-assembly of the central circular tube type as described in claim 1, characterized in that: The power sub-assembly also includes a lower stationary sleeve (14) fixed to the housing (10), and the lower stationary sleeve (14) and the lower moving sleeve (17) fixedly sleeved in the hollow lower part (163) form a sliding bearing for the upper high pressure zone and the lower low pressure zone of the partition.

3. The power sub-assembly of the central circular tube type as described in claim 2, characterized in that: An annular channel is formed between the lower stationary sleeve (14) of the partition and the porous stationary valve plate (15), and the annular channel connects all the auxiliary connecting holes (151). The auxiliary connecting holes (151) are four in number, and the four auxiliary connecting holes (151) are evenly distributed at equal angles along the axis of the porous static valve plate (15); the annular channel is connected to all the auxiliary connecting holes (151).

4. A hydraulic oscillator, characterized in that, Include: The power short section assembly as described in claim 1; The oscillating short section assembly is installed above the upper connector (1) of the power short section assembly; the oscillating short section assembly converts the pressure difference generated by the continuous change of the matching area between the eccentric hole at the bottom end of the central rotor shaft (16) of the power short section assembly and the eccentric hole of the multi-hole static valve plate (15) into vibration.

5. A hydraulic oscillator as described in claim 4, characterized in that: The power sub-assembly also includes a lower stationary sleeve (14) fixed to the housing (10), and the lower stationary sleeve (14) and the lower moving sleeve (17) fixedly sleeved in the hollow lower part (163) form a sliding bearing for the upper high pressure zone and the lower low pressure zone of the partition.

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