Rotary valve water hammer

Abstract

The application discloses a rotary valve type hydraulic oscillator and relates to the technical field of oil drilling, which comprises an upper shaft, an upper joint, a vibration generating mechanism, a rotary valve mechanism and a lower joint. The upper joint is sleeved with the outer periphery of the upper shaft, and the upper end of the upper joint is inserted with the outer wall of the upper shaft. The lower end of the upper joint is connected with one end of the vibration generating mechanism. The upper end of the upper shaft is used for the inlet of drilling fluid. The lower end of the upper shaft is connected with the vibration generating mechanism and is internally communicated. The outer part of the rotary valve mechanism is an outer pipe. The lower end of the outer pipe is connected with the upper end of the lower joint. The rotary valve mechanism is made of metal material. The rotary valve type hydraulic oscillator has long service life and high drilling efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling, in particular to a rotary valve type hydraulic oscillator. BACKGROUND

[0002] In view of the serious problem of pressure support in deep drilling, especially in the process of sliding drilling, due to the inclination of the well, the gravity component of the drill string acts on the well wall to produce friction resistance, it is difficult to effectively apply the drilling pressure to the bottom of the well to maintain the stability of the drill bit, which directly affects the drilling speed and drilling cycle. Moreover, for the valve control mechanism of the conventional hydraulic oscillator, its structure is directly exposed to high-speed fluid, which is severely eroded and directly leads to reduced service life, and the rubber stator in the screw rotary valve has poor high temperature resistance. Therefore, it is urgent to design a full-metal hydraulic oscillator that can avoid the direct erosion of the key components of the valve control mechanism to improve drilling efficiency and reduce costs. SUMMARY

[0003] The present application provides a rotary valve type hydraulic oscillator to solve the problems of the prior art, has a long service life and high drilling efficiency.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0005] The present application provides a rotary valve type hydraulic oscillator, comprising an upper shaft, an upper joint, a vibration generating mechanism, a rotary valve mechanism and a lower joint, the upper joint is sleeved on the outer periphery of the upper shaft, and the upper end of the upper joint is inserted with the outer wall of the upper shaft, the lower end of the upper joint is connected with one end of the vibration generating mechanism, the upper end of the upper shaft is used for the inlet of drilling fluid, the lower end of the upper shaft is connected with the vibration generating mechanism and internally communicates, the outer part of the rotary valve mechanism is an outer tube, the lower end of the vibration generating mechanism is connected with the upper end of the outer tube, the lower end of the outer tube is connected with the upper end of the lower joint, and the rotary valve mechanism is made of metal material.

[0006] Preferably, the vibration generating mechanism comprises a disc spring outer tube, an adjusting sleeve, a disc spring piece set, an upper gasket, a lower gasket, a piston sleeve, a positioning element and a coaxial sealing piston, the disc spring piece set is sleeved on the outer periphery of the upper shaft, and the two ends of the disc spring piece set abut against and are pre-tightened with the upper gasket and the lower gasket respectively, the two ends of the adjusting sleeve abut against the lower end of the upper connector and the upper end of the upper gasket respectively, the upper end of the positioning element is threadedly connected to the outer periphery of the lower end of the upper shaft and abuts against the lower end of the lower gasket, the coaxial sealing piston is installed on the outer periphery of the positioning element and is axially positioned by the positioning element, and the positioning element can communicate the upper shaft and the rotary valve mechanism, the piston sleeve is sleeved on the outer periphery of the coaxial sealing piston and the positioning element, and there is a gap between the outer wall of the positioning element and the inner wall of the piston sleeve, the upper end of the piston sleeve is threadedly connected with the inner wall of the lower end of the disc spring outer tube, and the lower end of the piston sleeve is threadedly connected with the inner wall of the upper end of the outer tube.

[0007] Preferably, the vibration generating mechanism further comprises a drop prevention ring, the outer periphery of the upper shaft is provided with a shaft step, the end face of the shaft step is arranged towards the disc spring piece set, and the upper end of the drop prevention ring is in contact with the end face of the shaft step, and the other end of the drop prevention ring is in contact with the upper end of the upper gasket.

[0008] Preferably, the inner wall of the upper end of the upper connector and the outer wall of the upper shaft are inserted by spline fitting, and a dust seal is further installed between the inner wall of the upper connector and the outer wall of the upper shaft, and the dust seal is arranged close to the upper end of the upper connector.

[0009] Preferably, the positioning element comprises an upper positioning tube and a lower positioning tube, the upper end of the upper positioning tube is threadedly connected to the outer periphery of the lower end of the upper shaft, the outer periphery of the upper positioning tube is provided with an upper step, the end face of the upper step is arranged towards the lower connector, the coaxial sealing piston and the lower positioning tube are both sleeved on the outer periphery of the upper positioning tube, and the lower positioning tube is threadedly connected with the upper positioning tube, one side of the coaxial sealing piston is in contact with the end face of the upper step, and the other side of the coaxial sealing piston is in contact with the upper end of the lower positioning tube.

[0010] Preferably, the valve switching mechanism comprises the outer pipe, the flow guide pipe, the packer pipe, the slow valve, the fast valve and the packer shaft which are sequentially sleeved from outside to inside, the side wall of the flow guide pipe is provided with a water passage which can communicate with the inside of the flow guide pipe, the side wall of the packer pipe is provided with a plurality of water passages which are arranged along the axial direction of the packer pipe, the flow guide pipe and the packer pipe can be fixed in the circumferential direction and make the water passage communicate with the water passage, the weight of the slow valve is greater than that of the fast valve, the lower end of the slow valve is rotationally connected with the lower end of the fast valve, the lower end of the slow valve is provided with a slow valve arc-shaped water channel, the lower end of the fast valve is provided with a fast valve arc-shaped water channel, the water passage can communicate with the slow valve arc-shaped water channel, the slow valve and the fast valve can rotate relative to each other and make the slow valve arc-shaped water channel communicate with or not communicate with the fast valve arc-shaped water channel, the side wall of the slow valve and the fast valve is provided with a communication channel, the side wall of the packer shaft is fixed with a limiting key, the limiting key can extend through the two communication channels and be limited on the inner wall of the packer pipe, and there is a gap between the side wall of the communication channel and the limiting key, the inner wall of the packer pipe is provided with a key groove, the limiting key can be embedded in the key groove, the side wall of the limiting key is curved, the upper end and the lower end of the packer shaft are respectively connected with an upper cover and a lower cover, and the packer pipe, the slow valve and the fast valve are limited between the upper cover and the lower cover, the inner passage of the packer shaft can communicate with the cavity on one side of the limiting key, and the lower end of the inner passage of the packer shaft can communicate with the inside of the lower joint.

[0011] Preferably, the slow valve comprises a slow valve body and a slow valve flange, the lower end of the slow valve body is fixed on the slow valve flange, the inside of the slow valve body is hollow and the side wall thereof is provided with the communication channel which can communicate with the inside of the slow valve body, the slow valve arc-shaped water channel is provided on the slow valve flange and can penetrate through the slow valve flange, and the slow valve arc-shaped water channel and the slow valve body have the same center; the fast valve comprises a fast valve body and a fast valve flange, the lower end of the fast valve body is fixed on the fast valve flange, the inside of the fast valve body is hollow and the side wall thereof is provided with the communication channel which can communicate with the inside of the fast valve body, the fast valve arc-shaped water channel is provided on the fast valve flange and can penetrate through the fast valve flange, and the fast valve arc-shaped water channel and the fast valve body have the same center.

[0012] Preferably, the slow valve flange is located on the upper end of the fast valve flange, and the lower end surface of the slow valve flange is provided with a lower limiting groove, the upper end surface of the fast valve flange is provided with an upper limiting groove corresponding to the position of the lower limiting groove, and a thrust bearing is installed between the upper limiting groove and the lower limiting groove; the lower end surface of the fast valve flange is provided with a bottom limiting groove, the upper end of the lower cover is provided with a top limiting groove, the lower cover is located on the lower end of the fast valve flange, and a thrust bearing is installed between the bottom limiting groove and the top limiting groove; the arc of the fast valve arc-shaped water channel is 90°, and the arc of the slow valve arc-shaped water channel is 30°.

[0013] Preferably, the side wall of the flow guide pipe is provided with two flow guide surfaces, the upper ends of the two flow guide surfaces extend to the upper end of the flow guide pipe, the two flow guide surfaces can receive the fluid flowing through the upper end opening of the outer pipe, the lower ends of the two flow guide surfaces do not contact, and the gap formed between the lower ends of the two flow guide surfaces is communicated with the upper end of the water passing channel, and the lower end of the water passing channel extends to the lower end of the flow guide pipe; the water passing channel is L-shaped and includes a longitudinal channel and a transverse channel, the upper end of the longitudinal channel is communicated with the gap between the two flow guide surfaces, and the lower end of the longitudinal channel is communicated with one end of the transverse channel.

[0014] Preferably, the lower cover is provided with a through hole corresponding to the position of the sealing core shaft inner channel, and the through hole can communicate the sealing core shaft inner channel with the lower end opening of the outer pipe.

[0015] The present application has the following technical effects compared with the prior art:

[0016] The valve type hydraulic oscillator provided by the application is characterized in that an upper joint sleeve is arranged on the outer periphery of an upper shaft, the upper end of the upper joint is inserted into the outer wall of the upper shaft to realize torque transmission, the lower end of the upper joint is connected with one end of a vibration generating mechanism, the liquid energy of mud is converted into the high-frequency vibration of the key components of the valve type hydraulic oscillator through the conversion of the hydraulic energy, so as to drive the vibration of the drill string, the friction between the drill string and the well wall is effectively reduced, the stability of the effective weight on the bottom of the well is improved, and the drilling efficiency is improved, the upper end of the upper shaft is used for the inlet of the drilling fluid, the lower end of the upper shaft is connected with the vibration generating mechanism and is internally communicated, the axial differential under the entrainment is changed into the circumferential differential by using the valve mechanism, the axial length of the drilling tool is reduced, the friction between the valve bodies is improved, the displacement required from the closing of the valve body to the opening of the valve body is controllably reduced, the ability of the valve mechanism to deal with different well inclinations is improved, the switching frequency of the valve mechanism is greatly improved, the number of times of the pressure surge in the upper cavity per unit time is improved, that is, under the condition of constant flow, the vibration frequency is higher, so the effective working range is expanded (the friction and resistance of the longer drill string are reduced), the outer periphery of the valve mechanism is an outer pipe, the lower end of the outer pipe is connected with the upper end of a lower joint, and then the connection between the structures is realized, the valve mechanism is made of metal material, and the high-temperature resistance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0018] Figure 1 is a structural schematic diagram of the valve type hydraulic oscillator provided by the present application.

[0019] Figure 2 is an installation schematic diagram of the fast valve and the slow valve in the present application.

[0020] Figure 3 is a structural schematic diagram of the flow guide pipe in the present application.

[0021] Figure 4 is a structural schematic diagram of the packer pipe in the present application.

[0022] Figure 5 is a structural schematic diagram of the slow valve in the present application.

[0023] Figure 6 is a top view of Figure 5 .

[0024] Figure 7It is the structure schematic view of the fast valve in the application;

[0025] Figure 8 It is Figure 7 the top view of the fast valve;

[0026] In the figure: 100-rotary valve type hydraulic oscillator, 1-upper mandrel, 2-upper joint, 21-dustproof ring, 22-male spline, 23-female spline, 3-vibration generating mechanism, 30-coaxial sealing piston, 31-dish spring outer tube, 32-adjusting sleeve, 33-anti-drop ring, 34-upper gasket, 35-dish spring piece group, 36-lower gasket, 37-piston sleeve, 38-upper positioning tube, 39-lower positioning tube, 4-rotary valve mechanism, 41-outer tube, 42-flow guide pipe, 421-flow guide surface, 422-water passage, 43-upper cover, 44-sealing pipe, 441-water hole, 442-key groove, 45-slow valve, 451-slow valve body, 452-slow valve flange plate, 453-slow valve arc-shaped waterway, 46-fast valve, 461-fast valve body, 462-fast valve flange plate, 463-fast valve arc-shaped waterway, 464-upper limiting groove, 465-lower arc-shaped end surface, 47-sealing mandrel, 471-limiting key, 472-limiting surface, 473-first cavity, 474-second cavity, 48-thrust bearing, 49-lower cover, 5-lower joint. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0028] The object of the application is to provide a rotary valve type hydraulic oscillator to solve the technical problems of short service life and low drilling efficiency of the existing oscillator.

[0029] In order to make the above-mentioned objects, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0030] As Figures 1-8As shown, the embodiment provides a rotary valve type hydraulic oscillator 100, which comprises an upper shaft 1, an upper joint 2, a vibration generating mechanism 3, a rotary valve mechanism 4 and a lower joint 5, the upper joint 2 is sleeved on the outer periphery of the upper shaft 1, and the upper end of the upper joint 2 is inserted with the outer wall of the upper shaft 1 to realize torque transmission, the lower end of the upper joint 2 is connected with one end of the vibration generating mechanism 3, through the liquid energy conversion of the mud, the hydraulic energy is converted into high-frequency vibration of the key components in the rotary valve type hydraulic oscillator 100, thereby driving the drill string to vibrate, which can effectively reduce the friction between the drill string and the well wall, improve the stability of the effective weight on the bottom of the well, thereby improving the drilling efficiency, the upper end of the upper shaft 1 is used for the inlet of the drilling fluid, the lower end of the upper shaft 1 is connected with the vibration generating mechanism 3 and internally communicates, the rotary valve mechanism 4 is used to change the axial differential under the effect of the suction into the circumferential differential, avoid using the axial pair to reduce the axial length of the drilling tool, and improve the friction between the valve bodies, controllably reduce the displacement required from the valve closing to the valve opening of the valve body, improve the ability of the rotary valve mechanism 4 to respond to different well inclinations, greatly improve the switching frequency of the rotary valve mechanism 4, and increase the number of pressure surges in the upper cavity per unit time, that is, under the condition of constant flow, it has higher vibration frequency, thereby expanding the effective working range (making the longer drill string reduce the friction and resistance), the outer part of the rotary valve mechanism 4 is an outer pipe 41, the lower end of the vibration generating mechanism 3 is connected with the upper end of the outer pipe 41, the lower end of the outer pipe 41 is connected with the upper end of the lower joint 5, thereby realizing the connection between the structures, the rotary valve mechanism 4 is made of metal material, which improves the high temperature resistance.

[0031] Specifically, the vibration generating mechanism 3 comprises a disc spring outer tube 31, an adjusting sleeve 32, a disc spring piece group 35, an upper gasket 34, a lower gasket 36, a piston sleeve 37, a positioning element and a coaxial sealing piston 30, the disc spring piece group 35 is sleeved on the outer periphery of the upper shaft 1, and the two ends of the disc spring piece group 35 abut against and are pre-tightened with the upper gasket 34 and the lower gasket 36 respectively, that is, in the initial state, the disc spring piece group 35 is in the compressed state, and during the process of lowering the drilling tool into the well, the weight of the lower drilling tool acts on the contact surface between the adjusting sleeve 32 and the upper gasket 34, and the disc spring piece group 35 does not contract after being subjected to the downward pulling force of the upper gasket 34 due to the axial pre-tightening force of the disc spring piece group 35 during assembly; the two ends of the adjusting sleeve 32 abut against the lower end of the upper joint 2 and the upper end of the upper gasket 34 respectively, the upper end of the positioning element is threadedly connected to the outer periphery of the lower end of the upper shaft 1 and abuts against the lower end of the lower gasket 36, the coaxial sealing piston 30 is installed on the outer periphery of the positioning element and is axially positioned by the positioning element, and the positioning element can communicate the upper shaft 1 and the rotary valve mechanism 4, so that the drilling fluid can flow into the rotary valve mechanism 4 from the inner cavity of the positioning element, and the opening and closing of the water passage in the rotary valve mechanism 4 are realized, the piston sleeve 37 is sleeved on the outer periphery of the coaxial sealing piston 30 and the positioning element, and there is a gap between the outer wall of the positioning element and the inner wall of the piston sleeve 37, which ensures that when the water passage in the rotary valve mechanism 4 is closed, the drilling fluid can enter the gap between the positioning element and the piston sleeve 37 and impact the coaxial sealing piston 30, the upper end of the piston sleeve 37 is threadedly connected to the inner wall of the lower end of the disc spring outer tube 31, and the lower end of the piston sleeve 37 is threadedly connected to the inner wall of the upper end of the outer tube 41. During the circulation drilling process, the circulation flow of the drilling fluid causes the rotary valve mechanism 4 to reciprocate and switch, when the valve is closed, a sudden increase in hydraulic pressure is generated on the lower end surface of the coaxial sealing piston 30 and the upper end surface (the upper cover 43) of the rotary valve mechanism 4, under the action of the pressure difference, the upper joint 2 fixedly connected with the rotary valve mechanism 4 has a downward movement trend, the upper shaft 1 fixedly connected with the coaxial sealing piston 30 has an upward movement trend, and the disc spring piece group 35 is compressed and shortened axially because the extrusion force of the lower end surface of the adjusting sleeve 32 and the upper end surface of the upper positioning tube 38 exceeds the pre-tightening force, so that the upper joint 2, the disc spring outer tube 31, the piston sleeve 37, the outer tube 41, the lower joint 5 and the drilling tool connected below are axially displaced downward relative to the upper shaft 1 and the drilling tool above, when the valve is opened, the disc spring piece group 35 rebounds, so that the upper joint 2, the disc spring outer tube 31, the piston sleeve 37, the outer tube 41, the lower joint 5 and the drilling tool connected below are axially displaced upward relative to the upper shaft 1 and the drilling tool above, and this displacement reciprocally changes up and down with the reciprocating opening and closing of the valve, and vibration is generated. This vibration will convert the friction between the drilling tool of thousands of meters underground and the well wall from static friction to dynamic friction, which will greatly reduce the friction resistance of the drilling tool and improve the transmission efficiency of the drilling pressure.

[0032] The vibration generating mechanism 3 further comprises an anti-drop ring 33, the outer periphery of the upper mandrel 1 is provided with a mandrel step, the end face of the mandrel step is arranged towards the disc spring piece group 35, the upper end of the anti-drop ring 33 is in contact with the end face of the mandrel step, the other end of the anti-drop ring 33 is in contact with the upper end of the upper gasket 34, and the anti-drop ring 33 is arranged to prevent the occurrence of the downhole accident of the "core extraction" of the drilling tool components after the upper joint 2 is disconnected from the disc spring outer tube 31.

[0033] The inner wall of the upper end of the upper joint 2 and the outer wall of the upper mandrel 1 are inserted and connected through spline cooperation, that is, the inner wall of the upper joint 2 and the outer wall of the upper mandrel 1 are circumferentially limited and torque-transmitted through the cooperation of the male spline 22 and the female spline 23, and the dustproof ring 21 is further arranged between the inner wall of the upper joint 2 and the outer wall of the upper mandrel 1, and the dustproof ring 21 is arranged close to the upper end of the upper joint 2.

[0034] The positioning element comprises an upper positioning tube 38 and a lower positioning tube 39, the upper end of the upper positioning tube 38 is threadedly connected to the outer periphery of the lower end of the upper mandrel 1, the outer periphery of the upper positioning tube 38 is provided with an upper step, the end face of the upper step is arranged towards the lower joint 5, the coaxial sealing piston 30 and the lower positioning tube 39 are both sleeved on the outer periphery of the upper positioning tube 38, and the lower positioning tube 39 is threadedly connected to the upper positioning tube 38, one side of the coaxial sealing piston 30 is in contact with the end face of the upper step, and the other side of the coaxial sealing piston 30 is in contact with the upper end of the lower positioning tube 39, and the axial limitation of the coaxial sealing piston 30 is realized through the cooperation of the upper positioning tube 38 and the lower positioning tube 39.

[0035] The valve rotating mechanism 4 comprises, from outside to inside, an outer pipe 41, a flow guide pipe 42, a sealing pipe 44, a slow valve 45, a fast valve 46 and a sealing core shaft 47. The inner wall of the outer pipe 41 and the outer wall of the flow guide pipe 42 are provided with limiting step surfaces in an interference fit, and the limiting step surfaces are arranged in an up-down manner and are coincident with each other to realize limiting function. A water passing channel 422 is formed in the side wall of the flow guide pipe 42 to communicate with the inside of the flow guide pipe 42, so that the fluid flowing through the opening at the upper end of the outer pipe 41 can enter the water passing channel 422. A plurality of water passing holes 441 are formed in the side wall of the sealing pipe 44 in an axial arrangement. The flow guide pipe 42 and the sealing pipe 44 are fixed in a circumferential direction by means of hole shaft interference fit and the like, and the water passing channel 422 is communicated with the water passing holes 441. The sealing pipe 44 and the sealing core shaft 47 are arranged to make the fluid generate a swirling action when passing through the water passing channel 422 to reduce the pressure of the first chamber 473, so as to facilitate the movement of the fast valve 46 and the slow valve 45. The fast valve 46 and the slow valve 45 are protected in a certain cavity by the sealing pipe 44 and the sealing core shaft 47 to reduce the erosion degree of the fluid and prolong the service life. The weight of the slow valve 45 is greater than that of the fast valve 46, so that the rotating speed of the slow valve 45 is lower than that of the fast valve 46. The lower end of the slow valve 45 is rotatably connected with the lower end of the fast valve 46. The lower end of the slow valve 45 is provided with a slow valve arc-shaped water channel 453, and the lower end of the fast valve 46 is provided with a fast valve arc-shaped water channel 463. The water passing channel 422 is communicated with the slow valve arc-shaped water channel 453, so that the rotating speeds of the fast valve 46 and the slow valve 45 are different due to the weight difference when subjected to pressure difference, the fast valve 46 and the slow valve 45 are relatively rotated to make the slow valve arc-shaped water channel 453 communicated with or not communicated with the fast valve arc-shaped water channel 463, and different states of the valve rotating mechanism 4 are realized. The side walls of the slow valve 45 and the fast valve 46 are provided with communication channels. The side wall of the sealing core shaft 47 is fixed with a limiting key 471. The limiting key 471 can extend through the two communication channels and be limited on the inner wall of the sealing pipe 44. There is a gap between the side wall of the communication channel and the limiting key 471. When the fluid passes through the water passing channel 422 and forms swirling, the chambers on both sides of the limiting key 471 (i.e. the first chamber 473 and the second chamber 474 formed between the two end surfaces of the communication channel, the outer wall of the limiting key 471 and the limiting surface 472) form a pressure difference, so as to drive the fast valve 46 and the slow valve 45 to rotate. The inner wall of the sealing pipe 44 is provided with a key groove 442, and the limiting key 471 can be embedded in the key groove 442 to realize the circumferential positioning of the sealing pipe 44 and the sealing core shaft 47. The side wall of the limiting key 471 is a curved surface, and two limiting surfaces 472 are arranged on both sides of the limiting key 471. The two limiting surfaces 472 on the same side are respectively used for limiting the end surfaces of the two communication channels during the rotation of the fast valve 46 and the slow valve 45. The upper end and the lower end of the sealing core shaft 47 are respectively connected with an upper cover 43 and a lower cover 49, and the sealing pipe 44, the slow valve 45 and the fast valve 46 are limited between the upper cover 43 and the lower cover 49 to facilitate the relative movement between the structures.The lower end surface of the upper cover 43 contacts the upper end surfaces of the sealing core shaft 47, the fast valve 46, the slow valve 45 and the sealing pipe 44, the upper end surface of the fast valve 46, the upper end surface of the slow valve 45 and the lower end surface of the upper cover 43 are in clearance fit, and a limiting step surface is arranged on the inner wall of the flow guide pipe 42, and the partial outer edge of the upper cover 43 can be limited at the limiting step surface, the inner passage of the sealing core shaft 47 can be communicated with the second cavity 474, and the lower end of the inner passage of the sealing core shaft 47 can be communicated with the inside of the lower joint 5. Through the above design, the axial differential under the effect of the suction is changed into the circumferential differential, the friction between the valve bodies is improved, the direct erosion of the fluid to the valve bodies is relieved, the required displacement from the closing of the valve body to the opening of the valve body is controllably reduced, the ability of the rotary valve mechanism 4 to cope with different well inclinations is improved, and the opening and closing frequency and service life of the rotary valve mechanism 4 are greatly improved.

[0036] The slow valve 45 comprises a slow valve body 451 and a slow valve flange plate 452, the lower end of the slow valve body 451 is fixed on the slow valve flange plate 452, the inside of the slow valve body 451 is hollow and a communication passage capable of communicating the inside of the slow valve body 451 is arranged on the side wall, a slow valve arc-shaped water channel 453 is arranged on the slow valve flange plate 452 and can penetrate the slow valve flange plate 452 to facilitate the flow of fluid, the slow valve arc-shaped water channel 453 has the same center as the slow valve body 451, the lower end of the sealing pipe 44 and the lower end of the flow guide pipe 42 are in clearance fit with the upper end of the slow valve flange plate 452 to reduce the friction when rotating; the fast valve 46 comprises a fast valve body 461 and a fast valve flange plate 462, the lower end of the fast valve body 461 is fixed on the fast valve flange plate 462, the inside of the fast valve body 461 is hollow and a communication passage capable of communicating the inside of the fast valve body 461 is arranged on the side wall, a fast valve arc-shaped water channel 463 is arranged on the fast valve flange plate 462 and can penetrate the fast valve flange plate 462 to facilitate the flow of fluid, the fast valve arc-shaped water channel 463 has the same center as the fast valve body 461, the lower end surface of the fast valve flange plate 462 is in clearance fit with the upper end surface of the lower cover 49, and is limited by the thrust bearing 48 between the fast valve flange plate 462 and the lower cover 49.

[0037] The outer cylindrical surface of the slow valve flange plate 452 and the outer cylindrical surface of the fast valve flange plate 462 are in hole-shaft gap fit with the inner wall of the outer pipe 41, the inner and outer cylindrical surfaces of the slow valve body 451 and the inner and outer cylindrical surfaces of the fast valve body 461, the inner cylindrical surface of the packer 44 and the outer cylindrical surface of the packer core shaft 47 are in hole-shaft gap fit, the slow valve body 451 is sleeved on the outer periphery of the fast valve body 461, the slow valve flange plate 452 is located on the upper end of the fast valve flange plate 462, and a lower limit groove is formed in the lower end surface of the slow valve flange plate 452, an upper limit groove 464 is formed in the upper end surface of the fast valve flange plate 462 at a position corresponding to the lower limit groove, a thrust bearing 48 is installed between the upper limit groove 464 and the lower limit groove, so that the fast valve 46 and the slow valve 45 can stably rotate relative to each other; a bottom limit groove is formed in the lower end surface of the fast valve flange plate 462, a top limit groove is formed in the upper end of the lower cover 49, the lower cover 49 is located at the lower end of the fast valve flange plate 462, and a thrust bearing 48 is installed between the bottom limit groove and the top limit groove, so that the fast valve 46 can stably rotate relative to the lower cover 49; the arc of the fast valve arc-shaped water channel 463 is 90°, and the arc of the slow valve arc-shaped water channel 453 is 30°, and in the actual design process, the arc of the fast valve arc-shaped water channel 463 and the slow valve arc-shaped water channel 453 can be adaptively changed according to actual needs.

[0038] Two guide surfaces 421 are arranged on the side wall of the flow guide pipe 42, the guide surfaces 421 are arc-shaped curved surfaces formed at the upper end of the flow guide pipe 42, and from top to bottom, the two guide surfaces 421 gradually approach each other, that is, the opening formed between the two guide surfaces 421 gradually decreases, the upper ends of the two guide surfaces 421 extend to the upper end of the flow guide pipe 42, and the two guide surfaces 421 can receive the fluid flowing down through the upper opening of the outer pipe 41, the lower ends of the two guide surfaces 421 do not contact each other, and the gap between the lower ends of the two guide surfaces 421 is in communication with the upper end of the water passage 422, so that the fluid flowing down through the guide surfaces 421 can enter the water passage 422, and the lower end of the water passage 422 extends to the lower end of the flow guide pipe 42, so as to facilitate the fluid flowing into the slow valve arc-shaped water channel 453 through the lower end of the water passage 422; the water passage 422 is L-shaped and includes a longitudinal passage and a transverse passage, the upper end of the longitudinal passage is in communication with the gap between the two guide surfaces 421, and the lower end of the longitudinal passage is in communication with one end of the transverse passage, so that the L-shaped water passage 422 cooperates with the circumferential rotating valve design, thereby reducing the requirement for the entrainment effect, that is, improving the sensitivity of the rotating valve mechanism 4 to the start-up flow.

[0039] A through hole is formed in the lower cover 49 at a position corresponding to the inner passage of the packer core shaft 47, the through hole can communicate the inner passage of the packer core shaft 47 with the lower opening of the outer pipe 41, and the fluid can flow through.

[0040] The upper cover 43 and the lower cover 49 are fixed on the sealing core shaft 47 by screws, and the number of the screws can be selected according to actual needs to ensure stable connection during actual installation. The lower edge end surface of the limiting key 471 of the sealing core shaft 47 is in clearance fit with the upper end surface of the slow valve flange plate 452 and the lower arc-shaped end surface 465 of the communication passage, and the axial length of the sealing core shaft 47 is adjusted to ensure the realization and adjustment of the clearance fit.

[0041] The working principle of the rotary valve mechanism 4 in the rotary valve type hydraulic oscillator 100 provided by the embodiment is that the outer flow passage fluid flows into the outer pipe 41 from the inlet at the upper end of the outer pipe 41, flows along the guide surface 421 of the guide pipe 42, flows into the water passage 422, then enters the slow valve arc-shaped waterway 453, and finally flows out from the outlet at the lower end of the outer pipe 41.

[0042] The inner flow passage fluid flows out from the first chamber 473 through the water passage hole 441, and flows into the second chamber 474 from the outlet at the lower end of the outer pipe 41, the through hole of the lower cover 49 and the inner passage of the sealing core shaft 47, or the inner flow passage fluid flows into the first chamber 473 through the water passage hole 441, and flows out from the second chamber 474 from the inner passage of the sealing core shaft 47, the through hole of the lower cover 49 and the outlet at the lower end of the outer pipe 41.

[0043] The principles and implementation manners of the present application are described by using specific examples in the specification, and the above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, according to the idea of the present application, the specific implementation manners and application ranges will be changed by those skilled in the art. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A rotating valve hydrodynamic oscillator characterized in that: The application relates to a drilling fluid vibration device, which comprises an upper mandrel, an upper joint, a vibration generating mechanism, a rotary valve mechanism and a lower joint, the upper joint is sleeved on the outer periphery of the upper mandrel, the upper end of the upper joint is inserted into the outer wall of the upper mandrel, the lower end of the upper joint is connected with one end of the vibration generating mechanism, the upper end of the upper mandrel is used for the inlet of drilling fluid, the lower end of the upper mandrel is connected with the vibration generating mechanism and is internally communicated, the outer part of the rotary valve mechanism is an outer pipe, the lower end of the outer pipe is connected with the upper end of the lower joint, and the rotary valve mechanism is made of metal material. The rotary valve mechanism comprises, from outside to inside, the outer pipe, a flow guide pipe, a packer pipe, a slow valve, a fast valve and a packer core shaft, a water passing channel capable of communicating the inside of the flow guide pipe is arranged on the side wall of the flow guide pipe, a plurality of water passing holes arranged along the axial direction of the packer pipe are arranged on the side wall of the packer pipe, the flow guide pipe and the packer pipe can be fixed in the circumferential direction and make the water passing channel and the water passing holes communicated, the weight of the slow valve is greater than that of the fast valve, the lower end of the slow valve is rotationally connected with the lower end of the fast valve, a slow valve arc-shaped water channel is arranged on the lower end of the slow valve, a fast valve arc-shaped water channel is arranged on the lower end of the fast valve, the water passing channel can communicate with the slow valve arc-shaped water channel, the slow valve and the fast valve can relatively rotate and make the slow valve arc-shaped water channel and the fast valve arc-shaped water channel communicated or not communicated, a communicating channel is arranged on the side wall of the slow valve and the fast valve, a limiting key is fixed on the side wall of the packer core shaft, the limiting key can extend out through the two communicating channels and be limited on the inner wall of the packer pipe, and there is a gap between the side wall of the communicating channel and the limiting key, a key groove is arranged on the inner wall of the packer pipe, the limiting key can be embedded in the key groove, the side wall of the limiting key is a curved surface, the upper end and the lower end of the packer core shaft are respectively connected with an upper cover and a lower cover, and the packer pipe, the slow valve and the fast valve are all limited between the upper cover and the lower cover, the inner channel of the packer core shaft can be communicated with the cavity on one side of the limiting key, and the lower end of the inner channel of the packer core shaft can be communicated with the inside of the lower joint.

2. The rotating valve hydraulic oscillator of claim 1, wherein: The vibration generating mechanism comprises a disc spring outer tube, an adjusting sleeve, a disc spring piece group, an upper gasket, a lower gasket, a piston sleeve, a positioning element and a coaxial sealing piston, the disc spring piece group is sleeved on the outer periphery of the upper shaft, and the two ends of the disc spring piece group abut against and pre-tighten the upper gasket and the lower gasket respectively, the two ends of the adjusting sleeve abut against the lower end of the upper connector and the upper end of the upper gasket respectively, the upper end of the positioning element is threadedly connected to the outer periphery of the lower end of the upper shaft and abuts against the lower end of the lower gasket, the coaxial sealing piston is installed on the outer periphery of the positioning element and is axially positioned by the positioning element, and the positioning element can communicate the upper shaft and the rotary valve mechanism, the piston sleeve is sleeved on the outer periphery of the coaxial sealing piston and the positioning element, and there is a gap between the outer wall of the positioning element and the inner wall of the piston sleeve, the upper end of the piston sleeve is threadedly connected to the inner wall of the lower end of the disc spring outer tube, and the lower end of the piston sleeve is threadedly connected to the inner wall of the upper end of the outer tube.

3. The rotating valve hydraulic oscillator of claim 2, wherein: The vibration generating mechanism further comprises a drop prevention ring, the outer periphery of the upper shaft is provided with a shaft step, the end face of the shaft step is arranged towards the disc spring piece group, and the upper end of the drop prevention ring is in contact with the end face of the shaft step, and the other end of the drop prevention ring is in contact with the upper end of the upper gasket.

4. The rotating valve hydraulic oscillator of claim 2, wherein: The inner wall of the upper end of the upper connector and the outer wall of the upper shaft are inserted by spline fit, and a dustproof ring is further installed between the inner wall of the upper connector and the outer wall of the upper shaft, and the dustproof ring is arranged close to the upper end of the upper connector.

5. The rotating valve hydraulic oscillator of claim 2, wherein: The positioning element comprises an upper positioning tube and a lower positioning tube, the upper end of the upper positioning tube is threadedly connected to the outer periphery of the lower end of the upper shaft, the outer periphery of the upper positioning tube is provided with an upper step, the end face of the upper step is arranged towards the lower connector, the coaxial sealing piston and the lower positioning tube are both sleeved on the outer periphery of the upper positioning tube, and the lower positioning tube is threadedly connected to the upper positioning tube, one side of the coaxial sealing piston is in contact with the end face of the upper step, and the other side of the coaxial sealing piston is in contact with the upper end of the lower positioning tube.

6. The rotating valve hydraulic oscillator of claim 1, wherein: The slow valve comprises a slow valve body and a slow valve flange plate, the lower end of the slow valve body is fixed on the slow valve flange plate, the slow valve body is hollow inside and the side wall is provided with the communication channel capable of communicating the inside of the slow valve body, the slow valve arc-shaped water channel is arranged on the slow valve flange plate and can penetrate through the slow valve flange plate, and the slow valve arc-shaped water channel is concentric with the slow valve body; the fast valve comprises a fast valve body and a fast valve flange plate, the lower end of the fast valve body is fixed on the fast valve flange plate, the fast valve body is hollow inside and the side wall is provided with the communication channel capable of communicating the inside of the fast valve body, the fast valve arc-shaped water channel is arranged on the fast valve flange plate and can penetrate through the fast valve flange plate, and the fast valve arc-shaped water channel is concentric with the fast valve body.

7. The rotating valve hydraulic oscillator of claim 6, wherein: The slow valve flange plate is located on the upper end of the fast valve flange plate, and a lower limiting groove is formed on the lower end surface of the slow valve flange plate, and an upper limiting groove is formed on the upper end surface of the fast valve flange plate corresponding to the position of the lower limiting groove, and a thrust bearing is installed between the upper limiting groove and the lower limiting groove; a bottom limiting groove is formed on the lower end surface of the fast valve flange plate, and a top limiting groove is formed on the upper end of the lower cover, the lower cover is located on the lower end of the fast valve flange plate, and a thrust bearing is installed between the bottom limiting groove and the top limiting groove; the arc of the fast valve arc-shaped water channel is 90°, and the arc of the slow valve arc-shaped water channel is 30°.

8. The rotating valve hydraulic oscillator of claim 1, wherein: Two flow guide surfaces are arranged on the side wall of the flow guide pipe, the upper ends of the two flow guide surfaces extend to the upper end of the flow guide pipe, the two flow guide surfaces can receive fluid flowing through the upper opening of the outer pipe, the lower ends of the two flow guide surfaces are not in contact, and a gap is formed between the lower ends of the two flow guide surfaces, the gap is communicated with the upper end of the water passing channel, and the lower end of the water passing channel extends to the lower end of the flow guide pipe; the water passing channel is L-shaped and includes a longitudinal channel and a transverse channel, the upper end of the longitudinal channel is communicated with the gap between the two flow guide surfaces, and the lower end of the longitudinal channel is communicated with one end of the transverse channel.

9. The rotating valve hydraulic oscillator of claim 1, wherein: A through hole is formed on the lower cover corresponding to the position of the sealing core shaft inner channel, and the through hole can communicate the sealing core shaft inner channel with the lower opening of the outer pipe.

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