Hydraulic oscillator for oil drilling

Abstract

The application discloses a hydraulic oscillator for oil drilling, which comprises a valve control mechanism and a nozzle assembly. The valve control mechanism comprises at least two groups of valve control assemblies, and all the valve control assemblies are arranged in series. The mass of the valve core of all the valve control assemblies decreases in the direction from top to bottom. The topmost valve control assembly is connected with a vibrating mechanism. Each two adjacent groups of valve control assemblies are connected with each other by using the nozzle assembly. The nozzle assembly comprises a speed increasing element and a nozzle. During operation, the drilling fluid flows into the oscillator from the vibrating mechanism. In the process of opening and closing of the valve control assembly, the drilling fluid transmits pressure pulse to the vibrating mechanism. Under the action of the pressure pulse, the oscillator vibrates. In the application, the motion periods of the valve cores of the multiple groups of valve control assemblies are different. Under the action of the certain time and the certain flow, the closing times of the waterway are increased, the oscillation frequency dynamically changes in a range, and the oil field drilling work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of oilfield drilling equipment and its peripheral facilities, and in particular to a hydraulic oscillator for oil drilling. Background Technology

[0002] During oilfield drilling, severe pressure build-up occurs in deep drilling, especially during sliding drilling. Due to well inclination, the gravitational component of the drill string acts on the wellbore, creating friction and making it difficult to effectively apply drilling pressure (DP) to the bottom of the well and maintain stability of the DP applied by the drill bit. This directly reduces drilling speed and prolongs the drilling cycle. To address this problem, an oscillator is placed at a suitable location on the drill string. Through the hydraulic energy conversion of the drilling mud, the hydraulic energy is converted into high-frequency vibrations of key components in the oscillator, thereby causing the drill string to vibrate. This vibration effectively reduces friction between the drill string and the wellbore, alleviates the pressure build-up problem, and improves the stability of the effective DP applied to the bottom of the well.

[0003] Existing hydraulic oscillators primarily utilize a screw-rotor rotary valve to achieve periodic valve opening and closing, thereby periodically changing the pressure in the upper flow channel and driving the spring unit to vibrate. The presence of rubber components limits their performance and service life in high-temperature wells. Furthermore, a single-frequency oscillator has limited drag reduction effectiveness for the dynamically changing friction of the drill string during drilling; an oscillator with an output frequency range would provide better results. Additionally, the eccentric structure of the screw-rotor configuration increases the oscillator's lateral vibration, exacerbating the overall drill string vibration and reducing drilling efficiency.

[0004] Therefore, how to change the current situation of poor drilling efficiency of hydraulic oscillators in existing technologies has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic oscillator for oil drilling to solve the problems existing in the prior art and improve the efficiency of oilfield drilling operations.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a hydraulic oscillator for oil drilling, comprising:

[0007] A valve control mechanism includes at least two sets of valve control components, all of which are connected in series. Each valve control component includes a pipe and a valve core slidably disposed within the pipe. The valve core includes a piston and a sleeve valve, the sleeve valve being slidably fitted onto the outside of the piston. The valve core divides the pipe into an upper cavity and a lower cavity. The upper cavity can be connected to a vibration mechanism and can be connected to the lower cavity via the sleeve valve. The piston can block the connection between the sleeve valve and the lower cavity. The mass of the valve core decreases sequentially from top to bottom in all valve control components.

[0008] The nozzle assembly includes a topmost valve control assembly connected to the vibration mechanism. Each pair of adjacent valve control assemblies is connected via the nozzle assembly. The nozzle assembly includes a speed-increasing element and a nozzle. The speed-increasing element is connected to the nozzle. The speed-increasing element is located near the upper valve control assembly and is connected to the lower cavity of the upper valve control assembly. The nozzle is located near the lower valve control assembly and is connected to the upper cavity of the lower valve control assembly. Adjacent valve control assemblies are connected by tubing. The speed-increasing element has a guide channel with a spiral structure. The bottom surface of the guide channel is a conical spiral surface. The larger opening end of the guide channel is located near the upper valve control assembly.

[0009] Preferably, the sleeve valve has a communication port, and the piston has a plug that can block the communication port.

[0010] Preferably, a limit ring is provided on the inner wall of the pipe fitting, and the sleeve valve can abut against the limit ring.

[0011] Preferably, the vibration mechanism includes a piston sleeve, a coaxial sealing piston, and a piston positioning element. The coaxial sealing piston and the piston positioning element are both disposed inside the piston sleeve. The piston positioning element can fix the axial position of the coaxial sealing piston. The coaxial sealing piston abuts against the inner wall of the piston sleeve. The inner cavity of the piston positioning element is connected to the drilling fluid. The inner cavity of the piston sleeve can be connected to the drilling fluid through the piston positioning element. The inner cavity of the piston sleeve can also be connected to the upper cavity of the topmost valve control assembly through the piston positioning element.

[0012] Preferably, the piston positioning element includes an upper positioning tube and a lower positioning tube. The upper positioning tube has a positioning boss. The coaxial sealing piston is fitted outside the upper positioning tube and abuts against the positioning boss. The upper positioning tube passes through the coaxial sealing piston and is threadedly connected to the lower positioning tube. The end of the coaxial sealing piston away from the positioning boss abuts against the lower positioning tube.

[0013] Preferably, the upper positioning tube has a first communicating hole on its side wall, and the inner cavity of the upper positioning tube is connected to the inner cavity of the piston sleeve through the first communicating hole;

[0014] The nozzle has a second connecting hole on its side wall, and the nozzle communicates with the upper cavity of the lower valve control assembly via the second connecting hole.

[0015] Preferably, the upper positioning tube is connected to an upper spindle, and a disc spring assembly is fitted around the upper spindle. The disc spring assembly includes multiple disc spring plates. One end of the disc spring assembly abuts against the upper positioning tube. An outer disc spring tube is fitted around the disc spring assembly. One end of the outer disc spring tube is connected to the upper positioning tube, and the other end of the outer disc spring tube is connected to an upper connector. The upper connector is fitted around the upper spindle, and a sealing element is provided between the two. The upper connector is keyed to the upper spindle.

[0016] The other end of the disc spring assembly abuts against the upper connector using an adjusting sleeve. The adjusting sleeve is fitted onto the outside of the upper spindle, and gaskets are provided at both ends of the disc spring assembly.

[0017] Preferably, the valve control mechanism is connected to a lower connector, and both the upper connector and the lower connector have a connecting section that can be connected to the drill pipe.

[0018] Preferably, the valve control mechanism is made of metal.

[0019] Preferably, the pipe fittings of adjacent valve control assemblies are threaded together.

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] In the oil drilling hydraulic oscillator of the present invention, when in operation, the drilling fluid flows into the oscillator through the vibration mechanism, flows into the uppermost valve control assembly connected to the vibration mechanism, and enters the lower cavity of the valve control assembly through the sleeve valve, and then enters the upper cavity of the lower valve control assembly through the speed-increasing element and the nozzle. The drilling fluid can also enter the lower cavity of the lower valve control assembly through the sleeve valve. Due to the entrainment effect of the fluid flow, the valve core of the valve control assembly moves upward under the action of pressure difference until the piston seals the connection between the sleeve valve and the lower cavity. The water channel in the upper part of the valve control mechanism is blocked, and the drilling fluid can only remain in the vibration mechanism. The pressure in the vibration mechanism increases, and under the pressure of the drilling fluid, the valve core of the valve control assembly moves downward until the water channel opens, while the drilling fluid still enters the lower cavity through the sleeve valve. When the velocity difference of the fluid at both ends of the connecting hole reaches a certain value, the valve core moves upward again under the entrainment effect, repeating the above movement process. Similarly, under the action of the drilling fluid entering the lower valve control assembly through the speed-increasing element and nozzle, the valve core in the lower valve control assembly performs the same up-and-down reciprocating motion as the valve core in the upper valve control assembly. During the opening and closing of the valve control assembly, the drilling fluid transmits pressure pulses to the vibration mechanism, and the oscillator vibrates under the action of the pressure pulses. In the valve control mechanism of this invention, the mass of the valve cores of all valve control components decreases sequentially from top to bottom. The different movement cycles of the valve cores in multiple valve control components increase the number of water circuit closures within a certain time and flow rate, thereby increasing the vibration frequency of the oscillator. Simultaneously, the oscillation frequency is dynamically varied within a range to cope with the dynamically changing friction experienced by the drill string during drilling, thus improving the efficiency of oilfield drilling. It should also be emphasized that this invention incorporates a speed-increasing element. After passing through the guide channel of the speed-increasing element, the drilling fluid's circumferential velocity increases on top of its original axial velocity, increasing the overall velocity and thus increasing the flow rate of the drilling fluid entering the valve control components, enhancing the entrainment effect. Attached Figure Description

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

[0023] Figure 1 This is a schematic diagram of the hydraulic oscillator for oil drilling according to the present invention;

[0024] Figure 2 This is a perspective structural schematic diagram of the speed-increasing element of the hydraulic oscillator for oil drilling according to the present invention;

[0025] Figure 3This is a displacement curve diagram of the piston working process in an embodiment of the hydraulic oscillator for oil drilling of the present invention;

[0026] Figure 4 This is a schematic diagram of the working process of the piston in the hydraulic oscillator for oil drilling according to the present invention.

[0027] Among them, 1 is a pipe fitting, 2 is a piston, 3 is a sleeve valve, 4 is an upper cavity, 5 is a lower cavity, 6 is a speed-increasing element, 7 is a nozzle, 8 is a guide channel, 9 is a connecting port, 10 is a plug, 11 is a limiting retaining ring, 12 is a piston sleeve, 13 is a coaxial sealing piston, 14 is an upper positioning tube, 15 is a lower positioning tube, 16 is a positioning boss, 17 is a first connecting hole, 18 is a second connecting hole, 19 is an upper spindle, 20 is a disc spring assembly, 21 is a disc spring plate, 22 is a disc spring outer tube, 23 is an upper connector, 24 is an adjusting sleeve, 25 is a gasket, 26 is a lower connector, and 27 is a drain hole.

[0028] Curve A represents the displacement change curve of the piston in the upper valve control assembly, and curve B represents the displacement change curve of the lower valve control assembly. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The purpose of this invention is to provide a hydraulic oscillator for oil drilling to solve the problems existing in the prior art and improve the efficiency of oilfield drilling operations.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Please refer to Figures 1-4 ,in, Figure 1 This is a schematic diagram of the hydraulic oscillator for oil drilling according to the present invention. Figure 2 This is a perspective structural diagram of the speed-increasing element of the hydraulic oscillator for oil drilling according to the present invention. Figure 3 This is a displacement curve diagram showing the piston working process in an embodiment of the hydraulic oscillator for oil drilling according to the present invention. Figure 4 This is a schematic diagram of the working process of the piston in the hydraulic oscillator for oil drilling according to the present invention.

[0033] This invention provides a hydraulic oscillator for oil drilling, comprising a valve control mechanism and a nozzle assembly. The valve control mechanism includes at least two sets of valve control components, all connected in series. Each valve control component includes a pipe fitting 1 and a valve core slidably disposed within the pipe fitting 1. The valve core includes a piston 2 and a sleeve valve 3, the sleeve valve 3 being slidably fitted onto the outside of the piston 2. The valve core divides the pipe fitting 1 into an upper cavity 4 and a lower cavity 5. The upper cavity 4 can communicate with the vibration mechanism, and the upper cavity 4 can communicate with the lower cavity 5 via the sleeve valve 3. The piston 2 can block the connection between the sleeve valve 3 and the lower cavity 5. Along the top-to-bottom direction, the mass of the valve core in each valve control component decreases sequentially; the topmost... The valve control assembly is connected to the vibration mechanism. Each pair of adjacent valve control assemblies is connected by a nozzle assembly. The nozzle assembly includes a speed-increasing element 6 and a nozzle 7. The speed-increasing element 6 is connected to the nozzle 7. The speed-increasing element 6 is close to the upper valve control assembly and is connected to the lower cavity 5 of the upper valve control assembly. The nozzle 7 is located close to the lower valve control assembly and is connected to the upper cavity 4 of the lower valve control assembly. The pipes 1 of adjacent valve control assemblies are connected. The speed-increasing element 6 has a guide channel 8, which is a spiral structure. The bottom surface of the guide channel 8 is a conical spiral surface. The larger opening end of the guide channel 8 is located close to the upper valve control assembly.

[0034] In the oil drilling hydraulic oscillator of the present invention, when in operation, the drilling fluid flows into the oscillator through the vibration mechanism, flows into the uppermost valve control assembly connected to the vibration mechanism, and enters the lower cavity 5 of the valve control assembly through the sleeve valve 3, and then enters the upper cavity 4 of the lower valve control assembly through the speed-increasing element 6 and the nozzle 7. The drilling fluid can also enter the lower cavity 5 of the lower valve control assembly through the sleeve valve 3. Due to the entrainment effect of the fluid flow, the valve core of the valve control assembly moves upward under the action of pressure difference until the piston 2 blocks the connection between the sleeve valve 3 and the lower cavity 5. The water channel in the upper part of the valve control mechanism is blocked, and the drilling fluid can only remain in the vibration mechanism. The pressure in the vibration mechanism increases, and under the pressure of the drilling fluid, the valve core of the valve control assembly moves downward until the oscillating drilling fluid still enters the lower cavity 5 through the sleeve valve 3. The water channel is opened, and when the fluid flow reaches a certain velocity, the valve core moves upward again under the entrainment effect, repeating the above movement process. Similarly, under the action of the drilling fluid entering the lower valve control assembly through the speed-increasing element 6 and the nozzle 7, the valve core in the lower valve control assembly performs the same up-and-down reciprocating motion as the valve core in the upper valve control assembly. During the opening and closing of the valve control assembly, the drilling fluid transmits pressure pulses to the vibration mechanism. Under the action of the pressure pulses, the oscillator vibrates. In the valve control mechanism of this invention, the mass of the valve cores of all valve control components decreases sequentially from top to bottom. The movement cycles of the valve cores of the valve control components are different, and the number of valve control components is at least two sets. Under a certain time and flow rate, this increases the number of times the water circuit is closed, improves the vibration frequency of the oscillator, and simultaneously enables dynamic variation of the oscillation frequency within a certain range to cope with the dynamically changing friction experienced by the drill string during drilling, thereby improving the efficiency of oilfield drilling. It should also be emphasized that this invention incorporates a speed-increasing element 6. After passing through the guide channel 8 of the speed-increasing element 6, the drilling fluid's circumferential velocity increases on top of its original axial velocity, increasing the overall velocity and thus increasing the flow rate of the drilling fluid entering the valve control components, enhancing the entrainment effect.

[0035] The sleeve valve 3 has a connecting port 9, and the piston 2 has a plug 10. The plug 10 can block the connecting port 9. When the piston 2 moves upward until the plug 10 blocks the connecting port 9, the water circuit is closed. In practical applications, the sleeve valve 3 can be equipped with blind holes or grooves to reduce its size. Similarly, the piston 2 can also be equipped with blind holes or keyways to reduce its size, but this must be done without affecting their respective movements and the opening and closing of the water circuit.

[0036] To improve the accuracy of the reciprocating motion of the valve core, a limit ring 11 is provided on the inner wall of the fitting 1. The sleeve valve 3 can abut against the limit ring 11. When the sleeve valve 3 moves to abut against the limit ring 11, it stops moving. Correspondingly, the piston 2 has an inverted frustum structure adapted to the sleeve valve 3 to control the extreme position of the piston 2, avoid misalignment of the piston 2, and improve the working reliability of the valve core.

[0037] Specifically, the vibration mechanism includes a piston sleeve 12, a coaxial sealing piston 13, and a piston positioning element. Both the coaxial sealing piston 13 and the piston positioning element are housed within the piston sleeve 12. The piston positioning element fixes the axial position of the coaxial sealing piston 13. The coaxial sealing piston 13 abuts against the inner wall of the piston sleeve 12. The inner cavity of the piston positioning element is connected to the drilling fluid. The inner cavity of the piston sleeve 12 is also connected to the drilling fluid via the piston positioning element. Furthermore, the inner cavity of the piston sleeve 12 is connected to the upper cavity 4 of the topmost valve control assembly via the piston positioning element. The drilling fluid flows into the oscillator through the inner cavity of the piston positioning element and into the upper valve control assembly connected to the vibration mechanism. The valve core in the valve control assembly reciprocates to open and close the water passage. During the opening and closing of the valve control assembly, the drilling fluid transmits pressure pulses to the coaxial sealing piston 13. The coaxial sealing piston 13 abuts against the piston sleeve 12, and the oscillator vibrates under the action of the pressure pulses.

[0038] The piston positioning element also adopts a split structure, including an upper positioning tube 14 and a lower positioning tube 15. The upper positioning tube 14 has a positioning boss 16. The coaxial sealing piston 13 is fitted outside the upper positioning tube 14 and abuts against the positioning boss 16, which facilitates the positioning of the coaxial sealing piston 13. The coaxial sealing piston 13 is coaxially set with the drill rod to ensure reliable vibration transmission and reduce drill rod wear. The upper positioning tube 14 passes through the coaxial sealing piston 13 and is threadedly connected to the lower positioning tube 15. The end of the coaxial sealing piston 13 away from the positioning boss 16 abuts against the lower positioning tube 15. The upper positioning tube 14 and the lower positioning tube 15 cooperate to fix the axial position of the coaxial sealing piston 13 and improve the structural stability of the device.

[0039] More specifically, the upper positioning tube 14 has a first connecting hole 17 on its side wall. The inner cavity of the upper positioning tube 14 is connected to the inner cavity of the piston sleeve 12 via the first connecting hole 17, ensuring that drilling fluid can enter the inner cavity of the piston sleeve 12 and drive the sleeve valve 3 and piston 2 to move. It should be noted that the axial position of the first connecting hole 17 is reasonably set to avoid the piston 2 blocking the first connecting hole 17. In addition, in this invention, when the piston 2 moves upward, the lower positioning tube 15 extends into the central hole of the piston 2, providing guidance and limiting for the movement of the piston 2, further improving the working reliability and stability of the oscillator. Similarly, the nozzle 7 has a second connecting hole 18 on its side wall. The nozzle 7 is connected to the upper cavity 4 of the valve control assembly located at the lower part via the second connecting hole 18. The height of the second connecting hole 18 is reasonably set, and multiple second connecting holes 18 can be provided. Multiple second connecting holes 18 are evenly distributed circumferentially around the axis of the nozzle 7 to improve the uniformity of fluid flow and avoid the problem of radial displacement of the oscillator caused by uneven fluid flow, which leads to accelerated wear of the drill pipe.

[0040] In addition, the upper positioning tube 14 is connected to the upper spindle 19, and the upper spindle 19 is fitted with a disc spring assembly 20. The disc spring assembly 20 includes multiple disc spring plates 21. One end of the disc spring assembly 20 abuts against the upper positioning tube 14. The disc spring assembly 20 is fitted with a disc spring outer tube 22. One end of the disc spring outer tube 22 is connected to the upper positioning tube 14. The other end of the disc spring outer tube 22 is connected to an upper connector 23. The upper connector 23 is fitted outside the upper spindle 19 and a sealing element is provided between the two. The upper connector 23 and the upper spindle 19 are connected by a key. The other end of the disc spring assembly 20 abuts against the upper connector 23 through an adjusting sleeve 24. The adjusting sleeve 24 is fitted outside the upper spindle 19. Gaskets 25 are provided at both ends of the disc spring assembly 20. The upper positioning tube 14 is connected to the upper spindle 19 via a threaded pair and presses against the gasket 25 to generate a preload force on the disc spring assembly 20. The upper connector 23 is connected to the upper spindle 19 via a hole-shaft fit. The upper inner hole surface of the upper connector 23 has a sealing element, and the lower end has a spline that fits with the upper spindle 19 to achieve torque transmission. The adjusting sleeve 24 fits with the hole-shaft of the disc spring outer tube 22, with its upper end abutting against the lower end face of the upper connector 23 and its lower end abutting against the upper end face of the gasket 25. The lower end of the disc spring outer tube 22 is threadedly connected to the upper end of the piston sleeve 12, and the upper end face of the piston sleeve 12 abuts against the lower end face of the gasket 25. The coaxial sealing piston 13 fits with the hole-shaft of the piston sleeve 12. The coaxial sealing piston 13 is sleeved on the upper positioning tube 14, and the upper positioning tube 14 is tightened by the threaded connection between the lower positioning tube 15 and the upper positioning tube 14 to achieve axial positioning of the coaxial sealing piston 13. The disc spring assembly 20 in the connected oscillator is in a compressed state and has a certain preload. The value of the preload is determined based on the axial component of the drill string below the oscillator's position, which is determined by the oscillator's installation position in the drill string.

[0041] Correspondingly, fitting 1 is connected to a lower connector 26, and both the upper connector 23 and the lower connector 26 have connecting sections that can be connected to the drill pipe to ensure the smooth progress of oilfield drilling operations. In addition, the oscillator is also equipped with a drain hole 27 to drain residual drilling fluid from the oscillator during non-working hours.

[0042] It should also be noted that the valve control mechanism is made of metal, which improves the high temperature resistance of the oscillator and thus improves the adaptability of the oscillator. In practical applications, the mass can also be reduced by using lightweight materials such as titanium alloy and aluminum alloy, or by adding blind holes, axial keyways, etc. to reduce the volume without affecting the water circuit structure.

[0043] Furthermore, the pipe fittings 1 of adjacent valve control components are threaded together, which facilitates disassembly and assembly. In practical applications, the number of valve control components can be set according to specific working conditions, thereby improving the flexibility and adaptability of the valve control mechanism.

[0044] The working process of the hydraulic oscillator for oil drilling of the present invention will be further explained below, taking the number of valve control components as an example of two sets.

[0045] The valve core of the upper valve control assembly has a larger mass than that of the lower valve control assembly. Specifically, the mass m3 of the piston 2 in the lower valve control assembly is smaller than the mass m1 of the piston 2 in the upper valve control assembly (m1 > m3), and the mass m4 of the sleeve valve 3 in the lower valve control assembly is smaller than the mass m2 of the sleeve valve 3 in the upper valve control assembly (m2 > m4). This achieves the goal of making the valve core of the lower valve control assembly lighter. In the prior art, the return time of the piston 2 in the injection valve control mechanism is half of the downward time. This invention improves the suction effect by setting the speed-increasing element 6 and using a lightweight valve core in the lower valve control assembly. By adjusting the helix angle θ of the spiral structure of the speed-increasing element 6, the mass m3 of the piston 2 in the lower valve control assembly, and the mass m4 of the sleeve valve 3, the return time of the lower valve control assembly can be shortened to half that of the upper valve control assembly. At the same time, since the flow rate is constant, the downward time remains basically unchanged. Therefore, the axial displacement curves of the piston 2 in the upper valve control assembly and the piston 2 in the lower valve control assembly are as follows: Figure 3 As shown, Figure 3 In the diagram, curve A represents the displacement change curve of piston 2 in the upper valve control assembly, and curve B represents the displacement change curve of piston 2 in the lower valve control assembly. Figure 3 It is evident that within a given time period, the number of valve closing cycles of the valve control mechanism approximately doubles. By using the upper valve control assembly as the upper valve and the lower valve control assembly as the lower valve, while maintaining the same opening and closing frequencies for both the upper and lower valves, the vibration frequency of the vibration mechanism is increased without exacerbating wear on the upper and lower valves. Similarly, to achieve the same vibration frequency, i.e., the same valve closing frequency, the opening and closing frequencies required for each upper and lower valve in the valve control mechanism are lower than those of a conventional single-valve mechanism oscillator. This significantly reduces wear between valve components and increases the service life of the valve control mechanism.

[0046] The hydraulic oscillator for oil drilling of the present invention, by setting a valve control mechanism, increases the number of pressure surges in the upper chamber (inner cavity of piston sleeve 12) per unit time. That is, under constant flow conditions, it has a higher frequency of vibration, thereby increasing the effective working range of the hydraulic oscillator (reducing wear and resistance of longer drill string sections), while reducing the reciprocating frequency of each valve and the linear velocity of axial movement, thus increasing the service life of the oscillator. In addition, the present invention sets an acceleration element 6, in which a spiral guide channel 8 is set, to enhance the entrainment effect.

[0047] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A hydraulic oscillator for oil drilling, characterized by, The application relates to a valve control mechanism, which comprises at least two groups of valve control components, all of which are arranged in series; the valve control component comprises a pipe and a valve core slidingly arranged in the pipe; the valve core comprises a piston and a sleeve valve; the sleeve valve is slidingly arranged outside the piston; the valve core divides the pipe into an upper cavity and a lower cavity; the upper cavity can be connected with a vibration mechanism; the upper cavity can be connected with the lower cavity by the sleeve valve; the piston can block the connection between the sleeve valve and the lower cavity; the mass of the valve core decreases in a top-down direction; a nozzle assembly is arranged between the vibration mechanism and the uppermost valve control component; the nozzle assembly comprises a speed increasing element and a nozzle; the speed increasing element is connected with the nozzle; the speed increasing element is arranged close to the upper valve control component; the speed increasing element is connected with the lower cavity of the upper valve control component; the nozzle is arranged close to the lower valve control component; the nozzle is connected with the upper cavity of the lower valve control component; the pipes of the adjacent valve control components are connected; the speed increasing element has a spiral flow channel; the bottom surface of the flow channel is a conical spiral surface; the opening of the flow channel is arranged close to the upper valve control component. The sleeve valve has a communication port; the piston has a plug; the plug can block the communication port. A limiting ring is arranged on the inner wall of the pipe; the sleeve valve can abut against the limiting ring.

2. The hydraulic oscillator for oil drilling as claimed in claim 1, characterized in that: The vibration mechanism comprises a piston sleeve, a coaxial sealing piston and a piston positioning element; the coaxial sealing piston and the piston positioning element are arranged in the piston sleeve; the piston positioning element can fix the axial position of the coaxial sealing piston; the coaxial sealing piston abuts against the inner wall of the piston sleeve; the inner cavity of the piston positioning element is connected with drilling fluid; the inner cavity of the piston sleeve is connected with the drilling fluid through the piston positioning element; the inner cavity of the piston sleeve is also connected with the upper cavity of the uppermost valve control component through the piston positioning element.

3. The hydraulic oscillator for oil drilling as claimed in claim 2, characterized in that: The piston positioning element comprises an upper positioning pipe and a lower positioning pipe; the upper positioning pipe has a positioning boss; the coaxial sealing piston is arranged outside the upper positioning pipe and abuts against the positioning boss; the upper positioning pipe passes through the coaxial sealing piston and is threadedly connected with the lower positioning pipe; the end of the coaxial sealing piston, which is away from the positioning boss, abuts against the lower positioning pipe.

4. The hydraulic oscillator for oil drilling as claimed in claim 1, wherein: The side wall of the upper positioning pipe has a first communication hole; the inner cavity of the upper positioning pipe is connected with the inner cavity of the piston sleeve through the first communication hole; 5. The hydraulic oscillator for oil drilling as claimed in claim 4, characterized in that: The side wall of the nozzle has a second communication hole; the nozzle is connected with the upper cavity of the lower valve control component through the second communication hole.

6. The hydraulic oscillator for oil drilling as claimed in claim 5, characterized in that: ​ ​ 7. The hydraulic oscillator for oil drilling as claimed in claim 5, wherein: The upper positioning pipe is connected with an upper mandrel, a disc spring assembly is sleeved outside the upper mandrel, the disc spring assembly comprises a plurality of disc spring pieces, one end of the disc spring assembly abuts against the upper positioning pipe, a disc spring outer pipe is sleeved outside the disc spring assembly, one end of the disc spring outer pipe is connected with the upper positioning pipe, the other end of the disc spring outer pipe is connected with an upper joint, the upper joint is sleeved outside the upper mandrel and a sealing element is arranged between the upper joint and the upper mandrel, and the upper joint is connected with the upper mandrel in a key connection mode; The other end of the disc spring assembly abuts against the upper joint through an adjusting sleeve, the adjusting sleeve is sleeved outside the upper mandrel, and gaskets are arranged at both ends of the disc spring assembly.

8. The hydraulic oscillator for oil drilling as claimed in claim 7, characterized in that: The valve control mechanism is connected with a lower joint, the upper joint and the lower joint both have a connecting section, and the connecting section can be connected with a drill rod.

9. The hydraulic oscillator for oil drilling as claimed in any one of claims 1 to 8, characterized in that: The valve control mechanism is made of metal.

10. The hydraulic oscillator for oil drilling as claimed in any one of claims 1 to 8, characterized in that: The pipe pieces of adjacent valve control assemblies are connected in a threaded mode.

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