CN115822494A - Pulse amplifier and hydraulic oscillator comprising same - Google Patents

Abstract

The invention provides a pulse amplifier and a hydraulic oscillator comprising the same, which comprise a main body, wherein an oscillation cavity is arranged in the main body; the inlet joint is arranged at the front end of the main body and is connected with the pulse generating mechanism; the outlet joint is arranged at the front end of the main body and is connected with a vibration generating mechanism; the pulse pressure emitted by the pulse generating mechanism enters the oscillation cavity through the inlet connector, oscillates and is amplified in the oscillation cavity and then enters the vibration generating mechanism through the outlet connector. The invention realizes the resonance, superposition and amplification of pulse signals, thereby improving the utilization rate of energy, greatly improving the vibration energy of the hydraulic oscillator by the smallest pressure loss (energy loss) and solving the pressure supporting problem in the sliding drilling process of the ultra-deep and ultra-long horizontal well.

Description

Pulse amplifier and hydraulic oscillator comprising same

Technical Field

The invention relates to a pulse amplifier, belongs to the field of petroleum and natural gas exploration and development, and further relates to a hydraulic oscillator.

Background

With the acceleration of the development process of unconventional oil and gas exploration, horizontal well drilling occupies about 70 percent of the total number of global well drilling, and the length of a horizontal section shows a trend of increasing year by year. How to effectively reduce the friction resistance of a drill string, improve the mechanical drilling speed and the borehole extension capacity becomes one of the key points of the horizontal well drilling technology research and construction.

The hydraulic oscillator is a downhole tool for solving the problem of bottom-hole pressure holding and improving the transmission of the bit pressure, and converts partial hydraulic energy into vibration energy of a drill string, converts static friction between the drill string and a well wall into dynamic friction and reduces the frictional resistance between the drill string and the well wall. The hydraulic oscillator is mainly divided into a screw hydraulic oscillator and a turbine hydraulic oscillator, and the main principle is that pressure pulses are generated by overlapping and staggering throttling valve discs to push a piston to generate vibration. The hydraulic oscillator achieves good friction reduction and drag reduction effects in irregular oil and gas resource development horizontal wells in Chongqing, jiangsu, hainan and the like, but the hydraulic oscillator is generally 3-4MPa in pressure consumption, still has the problems of high pressure consumption and insufficient vibration force, and limits the application of the hydraulic oscillator in deep shale gas wells.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a pulse amplifier and a hydraulic oscillator comprising the same, which realize resonance, superposition and amplification of pulse signals, thereby improving the utilization rate of energy, greatly improving the vibration energy of the hydraulic oscillator by using the lowest possible pressure loss (energy loss) and solving the pressure supporting problem in the sliding drilling process of ultra-deep and ultra-long horizontal wells.

The invention provides a pulse amplifier, comprising:

the vibration isolator comprises a main body, wherein an oscillation cavity is arranged in the main body;

the inlet joint is arranged at the front end of the main body and is connected with the pulse generating mechanism; and

the outlet joint is arranged at the front end of the main body and is connected with the vibration generating mechanism;

the pulse pressure emitted by the pulse generating mechanism enters the oscillation cavity through the inlet connector, oscillates and is amplified in the oscillation cavity and then enters the vibration generating mechanism through the outlet connector.

The invention has the further improvement that the end surface of the inlet end of the oscillation cavity is an annular plane, the outlet end of the oscillation cavity is a conical inclined plane, and the conical inclined plane and the side wall of the main body form an oscillation cavity splitting angle.

The invention is further improved in that the inlet joint is provided with an inlet joint female thread, and the outlet joint is provided with an outlet joint male joint.

The invention is further improved in that the female thread of the inlet joint is provided with a fluorine rubber sealing ring.

According to another aspect of the present invention, there is also provided a hydroscillator, comprising:

the pulse amplifier;

the pulse generating mechanism is connected with the inlet joint of the pulse amplifier and is provided with a valve port which changes periodically; and

the vibration generating mechanism is connected with an outlet joint of the pulse amplifier and comprises a piston mechanism, and a vibration mandrel connected with a drill rod is arranged above the piston mechanism;

when the valve port changes periodically, pulse pressure changing periodically is formed above the pulse generating mechanism, the pulse pressure is amplified by the pulse amplifier and acts on the piston mechanism, and the piston mechanism drives the vibrating mandrel to vibrate periodically.

The invention is further improved in that the pulse generating mechanism comprises an outer shell, and a rotating mandrel is coaxially arranged inside the outer shell; the outer wall of the rotating mandrel is provided with a hydraulic rotating assembly;

and a valve disc mechanism is arranged at the end parts of the outer shell and the rotating mandrel, and the valve port is arranged on the valve disc mechanism.

The invention has the further improvement that the valve disc mechanism comprises a static valve disc arranged on the outer shell and a movable valve disc arranged at the end part of the rotating mandrel, wherein a static valve disc hole is formed in the static valve disc, and a movable valve disc hole is formed in the movable valve disc;

wherein the static valve disc hole and the movable valve disc hole are eccentrically arranged, and the valve port is formed by the overlapped part of the static valve disc hole and the movable valve disc hole.

The invention is further improved in that the upper end of the rotating mandrel is provided with a flow guide cap with an overflowing hole, and the lower part of the rotating mandrel is provided with a plurality of flow guide holes.

The invention is further improved in that the piston mechanism comprises a piston shell connected to the upper end of the outer shell, a piston block is arranged in the piston shell in a sliding mode, and a disc spring group is arranged at the upper end of the piston block.

The invention has the further improvement that an anti-drop shell is connected above the piston shell, and an anti-drop groove is arranged on the inner wall of the anti-drop shell;

the outer wall of the vibration mandrel is provided with an anti-falling clamping ring, and when the vibration mandrel moves in a reciprocating mode, the anti-falling clamping ring is limited in the anti-falling groove.

The invention is further improved in that the upper end of the anti-falling shell is connected with a spline shell, an internal spline is arranged on the spline shell, and an external spline matched with the internal spline is arranged on the outer wall of the vibration mandrel.

A further improvement of the invention is that the external splines and the internal splines are helical splines.

Compared with the prior art, the invention has the advantages that:

according to the hydraulic oscillator, relevant parameters of the pulse oscillation amplifier are optimally designed, so that the pulse oscillation amplifier and a power unit, a throttle valve disc and the like of the hydraulic oscillator work cooperatively, resonance, superposition and amplification of pulse signals are realized, the utilization rate of energy is improved, the vibration energy of the hydraulic oscillator is greatly improved with pressure loss (energy loss) as small as possible, and the pressure supporting problem in the sliding drilling process of ultra-deep and ultra-long horizontal wells is solved.

The pulse amplifier structure is designed according to the working parameters and the structural parameters of the existing hydraulic oscillator. The external dimensions are: the maximum diameter is 110mm, the length is 140mm, the space requirement is met, the pulse modulation of the invention can realize the pressure of outlet pulse jet flow of 4.5MPa, the pulse frequency is 40Hz, the pressure loss of the device is 0.3MPa, and the low-frequency and high-energy pulse jet flow is realized on the basis of low pressure loss, thereby improving the vibration energy of the hydraulic oscillator.

In the pulse amplifier, the inlet joint is provided with the drainage channel which is used for connecting flow passages with different sizes at the inlet of the device and reducing the pressure loss. The inner surface of the device is sprayed with tungsten carbide, so that the erosion resistance of the device is improved. And chamfering treatment is carried out in the oscillation cavity, so that the internal flow field can be optimized, and the cavitation effect and the erosion of the oscillation pulse fluid to the wall surface are reduced. In addition, the invention has small volume and simple structure, and is convenient to install and disassemble in the existing hydraulic oscillator.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic diagram of a pulse amplifier according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a hydroscillator according to an embodiment of the present invention;

FIG. 3 is a graph showing the outlet pressure of a hydroscillator in accordance with one embodiment of the present invention over time;

in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

The meaning of the reference symbols in the drawings is as follows:

100. the pulse amplifier comprises a pulse amplifier, 200, a pulse generation mechanism, 300, a vibration generation mechanism, 110, a main body, 111, an oscillation cavity, 112, an oscillation cavity wedge angle, 120, an inlet joint, 121, an inlet joint female thread, 130, an outlet joint, 131, an outlet joint male thread, 132, a fluororubber sealing ring, 210, an outer shell, 211, a lower joint, 220, a rotating mandrel, 221, a deflector cap, 222, an overflowing hole, 223, a deflector hole, 230, a hydraulic rotating component, 231, a gasket, 240, a valve disc mechanism, 241, a static valve disc, 242, a movable valve disc, 243, a static valve disc hole, 244, a movable valve disc hole, 310, a piston block, 311, a disc spring group, 312, a flow guide pipe, 320, a vibration mandrel, 321, an anti-drop snap ring, 322, a spiral spline, 330, a piston shell, 331, an anti-drop shell, 332, a spline shell, 333 and an anti-drop groove.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.

Fig. 1 schematically shows a pulse amplifier according to the present invention, comprising a main body 110, wherein the main body 110 is a hollow structure like a cylinder, and an oscillation cavity 111 is arranged inside the main body 110. An inlet connector 120 is provided at the front end of the body 110, and the inlet connector 120 is connected to the pulse generating mechanism 200. The rear end of the body 110 is provided with an outlet connector 130, and the outlet connector 130 is connected to a vibration generating mechanism 300. The pulse pressure generated by the pulse generating mechanism 200 enters the oscillation cavity 111 through the inlet joint 120, oscillates and is amplified in the oscillation cavity 111, and then enters the vibration generating mechanism 300 through the outlet joint 130.

In one embodiment, the end surface of the inlet end of the oscillation cavity 111 is a ring plane, and the outlet end is a tapered inclined surface, and the tapered inclined surface and the side wall of the main body 110 form an oscillation cavity cleavage angle 112.

The pulse fluid enters the oscillation cavity 111 through the inlet connector 120, the fluid is divided under the action of the splitting angle 112 of the oscillation cavity to generate self-oscillation in the oscillation cavity 111, and the modulated pulse jet flows out of the device through the outlet connector 130 to provide vibration energy for the vibration generating mechanism 300 of the hydraulic oscillator.

In one embodiment, the inlet connector 120 is provided with inlet connector female threads 121 and the outlet connector 130 is provided with outlet connector male threads 131.

Preferably, the inlet joint female thread 121 is provided with a fluorine rubber sealing ring 132. The fluororubber sealing ring 132 ensures that the device meets the sealing requirement of deep well underground high pressure.

In a preferred embodiment, the external dimensions of the pulse amplifier are: the maximum diameter is 110mm, the length is 140mm, the space requirement is met, the pulse modulation of the invention can realize the pressure of outlet pulse jet flow of 4.5MPa, the pulse frequency is 40Hz, the pressure loss of the device is 0.3MPa, and the low-frequency and high-energy pulse jet flow is realized on the basis of low pressure loss, thereby improving the vibration energy of the hydraulic oscillator.

In this embodiment, the inlet connector 120 is designed with a flow guiding channel for connecting different size flow channels at the inlet of the device, and can reduce the pressure loss. The inner surface of the device is sprayed with tungsten carbide, so that the erosion resistance of the device is improved. The inner part of the oscillation cavity 111 is chamfered, so that the internal flow field can be optimized, and the cavitation effect and the erosion of the oscillation pulse fluid to the wall surface are reduced.

According to another aspect of the present invention, there is also provided a hydraulic oscillator, as shown in fig. 2, comprising the pulse amplifier of the above embodiment, wherein the inlet connector 120 of the pulse amplifier is connected with a pulse generating mechanism 200, and the pulse generating mechanism 200 is provided with a valve port which changes periodically. The outlet joint 130 of the pulse amplifier is connected with a vibration generating mechanism 300, the vibration generating mechanism 300 comprises a piston mechanism, and a vibration mandrel 320 connected with a drill rod is arranged above the piston mechanism.

The fluid flows into the pulse generating mechanism 200 from above, and the pressure above the valve port changes periodically due to the periodic change of the valve port, thereby forming pulse pressure. The pulse pressure is transmitted to the pulse amplifier and passes through the oscillation cavity 111, and the fluid is divided under the action of the wedge angle 112 of the oscillation cavity to generate self-oscillation in the oscillation cavity 111, so that the amplified pulse pressure is formed. The amplified pulse pressure acts on the piston mechanism to drive the piston mechanism to reciprocate periodically along the axial direction, so that the vibration mandrel 320 is driven to vibrate periodically, the vibration mandrel 320 drives the drill rod to vibrate along the axial direction, static friction between the drill rod and the well wall is converted into dynamic friction, and resistance is reduced.

In one embodiment, the pulse generating mechanism 200 includes an outer housing 210, the outer housing 210 is a cylindrical housing, the upper end of the outer housing is provided with a male thread for connecting with the inlet connector female thread 121 of the pulse amplifier, and the lower end of the outer housing is provided with a lower connector 211. The inside of outer casing 210 is provided with rotating mandrel 220, and rotating mandrel 220 is the tubular structure, sets up with outer casing 210 is coaxial. An annular space is formed between the rotating mandrel 220 and the outer housing 210, and a hydraulic rotating assembly 230 is disposed on an outer wall of the rotating mandrel 220. The ends of the outer shell 210 and the rotating mandrel 220 are provided with a valve disc mechanism 240, and the valve disc mechanism 240 is provided with the valve port.

The hydraulic rotating assembly 230 is an assembly that is driven by water flow to rotate and drive the rotating mandrel 220 to rotate. The hydraulic rotating assembly 230 is preferably a turbine mechanism that is an annular structure and is located within the annular space. Preferably, the turbine mechanism comprises a plurality of annular turbine units, and a plurality of blades are arranged inside the turbine units, are obliquely arranged, and push the blades to enable the turbine units to rotate when the fluid passes through the blades. When the rotating mandrel 220 rotates, the valve port that drives the valve disc mechanism 240 changes periodically in size.

Preferably, the turbine group adopts a metal turbine group, the metal turbine group has the advantages of low pressure loss, erosion resistance, oil resistance, high temperature resistance and the like, the pressure of a ground slurry pump is reduced, and the tool is favorably used in an ultra-deep and ultra-long horizontal well.

In one embodiment, the valve disc mechanism 240 includes a static valve disc 241 disposed on the outer housing 210, and a movable valve disc 242 disposed on an end of the rotating mandrel 220, wherein a static valve disc hole 243 is disposed on the static valve disc 241, and a movable valve disc hole 244 is disposed on the movable valve disc 242. Wherein the stationary valve disc hole 243 and the movable valve disc hole 244 are eccentrically disposed, and a portion where the stationary valve disc hole 243 and the movable valve disc hole 244 coincide forms the valve port.

In the screw vibration hydroscillator according to the present embodiment, the lower end surface of the movable valve plate 242 is a smooth plane, and the inner movable valve plate hole 244 is an eccentric circular hole. The static valve disc 241 comprises a connecting cylinder sleeved in the turbine shell, the bottom end of the connecting cylinder is a smooth plane disc, and a static valve disc hole 243 in the disc is an eccentric round hole. By rotating the valve disc 242, the two valve disc holes 244 and the static valve disc hole 243 can be overlapped and staggered, and a small part of flow channels are still overlapped when the eccentric flow channels are staggered, so that the flow channels are not completely blocked.

In one embodiment, the upper end of the rotating mandrel 220 is provided with a cylindrical deflector cap 221. The lower part of the deflector cap 221 is connected with the rotating mandrel 220 through threads.

The upper end and the lower end of the hydraulic rotating assembly 230 are both provided with a gasket 231, and the gasket 231 is provided with a plurality of through holes; furthermore, the deflector cap 221 is provided with a plurality of flow holes 223 along the radial direction, and the lower portion of the rotating mandrel 220 is provided with a plurality of deflector holes.

In the hydraulic oscillator according to the present embodiment, the deflector cap 221 is provided with a plurality of flow holes 223 to divert a portion of the drilling fluid into the hydraulic rotating assembly 230, and the lower portion of the rotating mandrel 220 is provided with a plurality of deflector holes, so that the drilling fluid flowing through the hydraulic rotating assembly 230 enters the flow passage inside the rotating mandrel 220 through the deflector holes.

During assembly, the rotor of the hydraulic rotating assembly 230 is sleeved on the rotating mandrel 220 and is tightly pressed and fixed through the diversion cap 221 and the end face of the step at the lower end of the vibration mandrel 320, the lower part of the gasket 231 is in contact with the upper end face of the connecting cylinder of the static valve disc 241, the lower end face of the static valve disc 241 is in contact with the upper end face of the lower connector 211, and the stator of the hydraulic rotating assembly 230, the gasket 231 and the static valve disc 241 are tightly pressed and fixed through the step of the turbine outer shell 210 and the lower connector 211.

In one embodiment, the piston mechanism comprises a piston housing 330 connected to the outlet connector 130 of the pulse amplifier, the piston housing 330 is a cylindrical structure, a piston block 310 is slidably disposed in the piston housing 330, and a disc spring set 311 is disposed at an upper end of the piston block 310. The upper part of the piston shell 330 is provided with a flow guide pipe 312, the flow guide pipe 312 is connected with the male thread 131 of the outlet connector through a female thread, the lower end of the flow guide pipe 312 extends into the piston shell and is provided with a plurality of through holes on the side surface, and the through holes are used for guiding pressure to the upper end surface of the piston block 310.

In this embodiment, the piston block 310 has a cylindrical structure, a flow channel is disposed at the center thereof, and the vibrating mandrel 320 is connected to the upper end thereof. An annular space is formed in front of the vibration core shaft 320 and the piston housing 330 for mounting the disc spring assembly 311.

When the piston block 310 receives the pulse pressure amplified by the pulse amplifier, the piston block 310 is pushed to move when the pulse pressure is increased, and the disc spring set 311 can be compressed when the piston block 310 drives the vibration mandrel 320 to move upwards. When the pulse pressure is reduced, the disc spring set 311 pushes the piston block 310 to move downwards through the elastic force, and primary stretching vibration is completed.

In one embodiment, a drop-proof housing 331 is connected to the upper portion of the piston housing 330, and drop-proof grooves 333 are formed on the inner wall of the drop-proof housing 331; in the present embodiment, the drop-prevention groove 333 is an annular groove in the drop-prevention housing 331, and the upper end is the upper end surface of the spline housing 332.

An anti-dropping snap ring 321 is arranged on the outer wall of the vibration mandrel 320, and when the vibration mandrel 320 moves in a reciprocating manner, the anti-dropping snap ring 321 is limited in the anti-dropping groove 333.

Preferably, the vibration core shaft 320 is stepped in multiple stages, and a female button is provided at the upper portion thereof to be threadedly coupled to the upper drill string. The middle part of the vibration mandrel 320 is provided with a clamping block groove, and the clamping block groove is used for installing an anti-falling clamping ring 321. The anti-drop snap ring 321 is formed by two semicircular rings which are combined, and the outer diameter of the anti-drop snap ring 321 is larger than the male connector of the spline shell 332 and the male connector of the anti-drop shell 331.

In one embodiment, a spline housing 332 is connected to an upper end of the anti-drop housing 331, an internal spline is disposed on the spline housing 332, and an external spline matched with the internal spline is disposed on an outer wall of the vibration mandrel 320. In a preferred embodiment, the external splines and the internal splines are helical splines 322. The middle part of the vibration mandrel 320 is provided with a spiral inner spline, a spiral outer spline is arranged in the spline shell 332, and the spiral inner spline and the spiral outer spline are connected through a spiral spline. The vibratory mandrel 320 transfers weight-on-bit with the spline housing 332 through end face contact.

The helical spline can also rotate when vibrating along the axis, so that the drill string can be driven to generate high-frequency three-dimensional vibration, the static friction between the drill string and the well wall is changed into dynamic friction, the frictional resistance between the drill string and the well wall in the sliding drilling process is effectively reduced, and the problems of directional drilling pressure supporting, low mechanical drilling speed and the like are practically solved.

In one embodiment, the piston block 310 is slidably sealed to the piston housing 330 by a seal.

When the spiral vibration hydroscillator according to the present embodiment is used, the fluid passes through the vibration generating mechanism 300 from above into the pulse generating mechanism 200.

Fluid enters the annular space between the rotating mandrel 220 and the outer housing 210 from the flow port and the annular inlet at the upper end and into the hydro-rotating assembly 230. The fluid pushes the hydraulic rotation assembly 230 to rotate during the flowing process, thereby rotating the rotating mandrel 220. The rotating mandrel 220 drives the movable valve disc 242 to rotate, so that the two movable valve disc holes 244 and the static valve disc holes 243 can be overlapped and staggered, and pulse pressure is formed above the movable valve disc holes and the static valve disc holes.

The pulse fluid enters the oscillation cavity 111 through the inlet connector 120, the fluid is divided under the action of the splitting angle 112 of the oscillation cavity to generate self-oscillation in the oscillation cavity 111, and the modulated pulse jet flows out of the device through the outlet connector 130 to provide vibration energy for the vibration generating mechanism 300 of the hydraulic oscillator. The pressure change is shown in figure 3.

The vibration generating mechanism 300 drives the piston to extend and contract by the vibration energy, thereby extending and contracting the vibrating mandrel 320. The vibration mandrel 320 drives the drill rod to vibrate along the axial direction, so that the static friction force between the drill rod and the well wall is converted into the dynamic friction force, and the resistance is reduced.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.

Claims (12)

1. A pulse amplifier, comprising:

a main body (110), wherein an oscillation cavity (111) is arranged in the main body (110);

an inlet joint (120) arranged at the front end of the main body (110), wherein the inlet joint (120) is connected with a pulse generating mechanism (200); and

an outlet connector (130) arranged at the front end of the main body (110), wherein the outlet connector (130) is connected with a vibration generating mechanism (300);

the pulse pressure emitted by the pulse generating mechanism (200) enters the oscillation cavity (111) through the inlet connector (120), oscillates and is amplified in the oscillation cavity (111), and then enters the vibration generating mechanism (300) through the outlet connector (130).

2. The pulse amplifier according to claim 1, wherein the end face of the inlet end of the oscillation cavity (111) is a ring-shaped plane, and the outlet end is a tapered inclined plane, and the tapered inclined plane and the side wall of the main body (110) form an oscillation cavity splitting angle (112).

3. The pulse amplifier according to claim 2, wherein the inlet connector (120) is provided with an inlet connector female thread (121) and the outlet connector (130) is provided with an outlet connector male thread (131).

4. The pulse amplifier according to claim 3, wherein the inlet connector female thread (121) is provided with a fluoro-rubber seal (132).

5. A hydroscillator, comprising:

the pulse amplifier of any one of claims 1 to 4;

the pulse generating mechanism (200) is connected with an inlet joint (120) of the pulse amplifier, and a valve port which changes periodically is arranged on the pulse generating mechanism (200); and

the vibration generating mechanism (300) is connected with an outlet connector (130) of the pulse amplifier, the vibration generating mechanism (300) comprises a piston mechanism, and a vibration core shaft (320) connected with a drill rod is arranged above the piston mechanism;

when the valve port changes periodically, periodically-changed pulse pressure is formed above the pulse generating mechanism (200), and the pulse pressure is amplified by the pulse amplifier and acts on the piston mechanism, and the piston mechanism drives the vibration mandrel (320) to vibrate periodically.

6. The hydroscillator of claim 5, characterized in that said pulse generating mechanism (200) comprises an outer housing (210), said outer housing (210) being internally coaxially provided with a rotating mandrel (220); the outer wall of the rotating mandrel (220) is provided with a hydraulic rotating assembly (230);

the end parts of the outer shell (210) and the rotating mandrel (220) are provided with a valve disc mechanism (240), and the valve port is arranged on the valve disc mechanism (240).

7. The hydroscillator of claim 6, characterized in that said valve disk mechanism (240) comprises a static valve disk (241) disposed on said outer housing (210) and a moving valve disk (242) disposed at the end of said rotating mandrel (220), said static valve disk (241) having a static valve disk aperture (243) disposed thereon and said moving valve disk (242) having a moving valve disk aperture (244) disposed thereon;

wherein the stationary valve disc hole (243) and the movable valve disc hole (244) are eccentrically disposed, and a portion where the stationary valve disc hole (243) and the movable valve disc hole (244) coincide forms the valve port.

8. The hydroscillator of claim 7, characterized in that the upper end of the rotating mandrel (220) is provided with a deflector cap (221) with an overflow aperture (223), and the lower part of the rotating mandrel (220) is provided with a number of deflector apertures.

9. A hydroscillator according to any of claims 5 to 8 characterized in that said piston mechanism comprises a piston housing (330) attached to the upper end of the outer housing (210), a piston block (310) being slidably arranged in the piston housing (330), and a disc spring set (311) being arranged at the upper end of the piston block (310).

10. The hydroscillator of claim 9 wherein a drop-proof housing (331) is attached above the piston housing (330), and drop-proof grooves (333) are provided on the inner wall of the drop-proof housing (331);

the outer wall of the vibration mandrel (320) is provided with an anti-falling snap ring (321), and when the vibration mandrel (320) moves in a reciprocating mode, the anti-falling snap ring (321) is limited in the anti-falling groove (333).

11. The hydroscillator of claim 10, wherein a spline housing (332) is connected to the upper end of the drop-proof housing (331), wherein the spline housing (332) is provided with internal splines, and the outer wall of the oscillating mandrel (320) is provided with external splines matching with the internal splines.

12. The hydroscillator of claim 11 wherein said external splines and said internal splines are helical splines (322).

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