Modulation system of same frequency and different phase vibration, drilling tool and modulation method

Abstract

This invention discloses a modulation system, drill bit, and modulation method for vibrations of the same frequency but different phases. The modulation system includes at least two vibration modulation devices arranged at intervals along the length of the drill pipe. Each vibration modulation device includes a modulation sub-module, a backwash wave module, and a pulse wave module. The piston body of the backwash wave module is located on the mandrel joint in the modulation sub-module. A first elastic reset member is provided between the piston body and the inner end wall of the modulation sleeve. The moving disc valve in the pulse disc valve assembly of the pulse wave module is rotatably arranged and connected to a first water drive assembly. The moving disc valve rotates under the drive of the first water drive assembly to apply pulse wave pressure to the piston body by changing the flow area of ​​the pulse disc valve assembly. The moving disc valves arranged sequentially from front to back are arranged in the opposite direction to the rotation of the moving disc valves with an increasing phase angle, which allows the drill pipe to actively creep forward and improve the vibration drag reduction effect.

Description

Technical Field

[0001] This invention belongs to the field of drilling technology, and particularly relates to a modulation system, drilling tool and modulation method for vibrations of the same frequency but different phases. Background Technology

[0002] As unconventional oil and gas development moves towards deeper and ultra-deep formations, the drilling demand for ultra-long horizontal wells (>3000m) and wells with complex structures is gradually increasing. Frictional torque has become a core bottleneck restricting drilling efficiency for these well types. Especially during the drilling of ultra-long horizontal wells, the drill string adheres tightly to the wellbore under gravity, and the frictional resistance caused by contact restricts the transmission of drilling pressure, preventing the drill bit from obtaining sufficient rock-breaking load, affecting the drilling speed. Furthermore, excessive frictional torque can induce drill string buckling failure, posing a serious threat to downhole safety.

[0003] Meanwhile, vibration drag reduction technology transforms static friction between the tubing and wellbore into dynamic friction through axial / torsional vibration excitation, overcoming the limitations of existing boundary lubrication theories and achieving efficient friction reduction. This technology is particularly suitable for solving the high friction and high torque problems caused by "dragging pressure" in ultra-long horizontal sections and "helical buckling" in three-dimensional wells, playing a crucial role in the development of deep shale gas, tight oil and gas, and offshore oil and gas. Therefore, researching vibration friction reduction technology for long horizontal well sections is of great significance for the safe and efficient construction of horizontal wells and for supporting the economical and efficient development of unconventional oil and gas.

[0004] Currently, vibration drag reduction technology mainly includes two types: single-point vibration drag reduction and multi-point vibration drag reduction. It primarily uses a pulse generator to produce pulses that act on a vibration generating device, thereby causing the drill pipe near the generating device to vibrate. This reduces the contact friction coefficient between the drill pipe and the wellbore within the vibration influence range, achieving the effect of friction reduction and drag reduction. Single-point vibration drag reduction technology, because only one vibration device is installed in the drill pipe system, has a limited vibration influence range and is generally suitable for horizontal wells with short horizontal sections. For well types with prominent friction and torque, such as ultra-long horizontal wells (horizontal section length > 3000m), complex wellbore trajectories, extended reach wells, and U-shaped horizontal wells, two or more vibration drag reduction devices are generally used to form multi-point excitation drag reduction. By increasing the active excitation points in the drill string system, the vibration influence range is expanded, thereby improving the vibration drag reduction effect. However, because the two or more vibration drag reduction devices are independent of each other and may even interfere with each other, the application effect of multiple vibration drag reduction devices cannot be fully realized. Summary of the Invention

[0005] To address the aforementioned defects or deficiencies, this invention provides a modulation system, drilling tool, and modulation method for vibrations of the same frequency but different phases, aiming to solve the technical problem of poor performance caused by two or more vibration damping devices being independent of each other or even interfering with each other.

[0006] To achieve the above objectives, a first aspect of the present invention provides a modulation system for vibrations of the same frequency but different phases, wherein the modulation system includes at least two vibration modulation devices, and the vibration modulation devices include: The modulation sub module includes a modulation sleeve, a mandrel connector passing through the rear end of the modulation sleeve, and an end connector that mates with the front end of the modulation sleeve. Both the mandrel connector and the end connector are used to connect to the drill pipe sub and both have fluid flow channels. The backwave module includes a piston body and a first elastic reset member. The piston body is located at one end of the mandrel joint that extends into the modulation sleeve. The piston body is fitted against the inner circumferential wall of the modulation sleeve. The first elastic reset member is provided between the piston body and the inner end wall of the modulation sleeve. The pulse wave module includes a first water drive assembly and a pulse disc valve assembly arranged sequentially between the back wave module and the end connector along the axial direction of the modulation sleeve. The stationary disc valve in the pulse disc valve assembly is anti-rotation, and the moving disc valve is rotatably arranged and connected to the first water drive assembly. The moving disc valve is used to rotate under the drive of the first water drive assembly to apply pulse wave pressure to the piston body by changing the flow area of ​​the pulse disc valve assembly. In this configuration, at least two vibration modulation devices are arranged sequentially at intervals along the length of the drill pipe, and the moving disc valves arranged sequentially from front to back are arranged sequentially with increasing phase angles in the opposite direction to the rotation of the moving disc valves.

[0007] In one embodiment of the present invention, the stationary disc valve is provided with at least two first flow holes, which are evenly spaced on a first circumference with the center line of the rotating shaft of the moving disc valve as the center line. The moving disc valve is provided with a second flow hole and a third flow hole, the number of the second flow hole and the third flow hole are the same as the number of the first flow holes, and the diameter of the third flow hole is smaller than the diameter of the second flow hole. The second flow hole and the third flow hole are alternately and evenly spaced on the first circumference. The arc length of the first flow hole on the first circumference is greater than the arc length of the solid portion between adjacent second flow holes and third flow holes on the first circumference, and less than the arc length between the centers of adjacent second flow holes and third flow holes on the first circumference.

[0008] In one embodiment of the present invention, the number of first flow holes is set to four, and the phase angle difference between the moving disc valves in two adjacent vibration modulation devices is less than 90°.

[0009] In one embodiment of the present invention, the phase angle difference ∆θ of the moving disc valves in two adjacent vibration modulation devices is less than 360° / n, where n represents the number of first flow holes.

[0010] In one embodiment of the present invention, the first water drive assembly is configured as a screw drive assembly. The screw drive assembly includes a screw stator fixedly disposed in the modulation sleeve and a screw rotor rotatably disposed in the screw stator. The screw rotor is connected to the moving disc valve through a flexible connector and is used to drive the moving disc valve to rotate when drilling fluid is injected.

[0011] In one embodiment of the present invention, the peripheral walls of the moving disc valve and the stationary disc valve are provided with positioning grooves and anti-rotation grooves corresponding to each other. The positioning grooves and anti-rotation grooves are both axially extended on the corresponding disc valves. The pulse disc valve assembly also includes a disc valve seat fixedly disposed in the modulation sleeve. The moving disc valve and the stationary disc valve are stacked sequentially along the axial direction of the modulation sleeve and are both axially movable in the disc valve seat. The disc valve seat is provided with an elastic positioning component that can extend into or retract from the positioning groove corresponding to the moving disc valve. The disc valve seat is provided with an anti-rotation shaft that extends into the anti-rotation groove and abuts against the stationary disc valve corresponding to the stationary disc valve. The two opposite ends of the moving disc valve are provided with a first connecting shaft portion and a second connecting shaft portion. The first connecting shaft portion faces the stationary disc valve and passes through the stationary disc valve. The radial cross section of the first connecting shaft portion is polygonal. The pulse wave module also includes an impeller drive assembly and a centralizing sleeve. The centralizing sleeve is axially positioned between the screw drive assembly and the pulse disc valve assembly. The centralizing sleeve is connected to the screw rotor through a flexible connector. The centralizing sleeve is provided with a centralizing mounting hole and a fourth flow hole. The centralizing mounting hole is located on the center line of the rotating shaft of the moving disc valve and allows the first connecting shaft to pass through. The centralizing mounting hole has a circular hole section and a polygonal hole section in sequence from the end face facing the pulse disc valve assembly. The radial section of the circular hole section is set as the circumcircle of the first connecting shaft, and the polygonal hole section is set to have the same shape as the radial section of the first connecting shaft. A second elastic reset member is provided between the centralizing sleeve and the stationary disc valve. The impeller drive assembly is located on the second connecting shaft.

[0012] In one embodiment of the present invention, the disc valve seat is provided with a first mounting hole corresponding to the movable disc valve, and the elastic positioning component is placed in the first mounting hole and includes a mounting plug, a third elastic reset member and a positioning ball arranged in sequence. The third elastic reset member is used to drive the positioning ball into the positioning groove when it is elastically extended, and to drive the positioning ball out of the positioning groove when it is elastically compressed.

[0013] In one embodiment of the present invention, the disc valve seat is provided with a second mounting hole corresponding to the stationary disc valve, and the modulation sleeve is provided with a third mounting hole that communicates with the second mounting hole. The anti-rotation shaft passes through the third mounting hole and the second mounting hole in sequence and extends into the anti-rotation groove to abut against the stationary disc valve.

[0014] In one embodiment of the present invention, the inner wall of the modulation sleeve is provided with a first step surface, a second step surface and a third step surface at intervals along the length direction. The first step surface, the second step surface and the third step surface are located between the piston body and the screw drive assembly and are all arranged facing the piston body. The first step surface axially abuts against the end of the disc valve seat away from the piston body. The second elastic reset member is placed in the space between the first step surface and the second step surface, and the end of the second elastic reset member away from the piston body abuts against the second step surface axially. The straightening sleeve is placed in the space between the second step surface and the third step surface, and the end of the straightening sleeve away from the piston body abuts against the third step surface axially.

[0015] In one embodiment of the present invention, the second connecting shaft includes a main shaft section and a mounting shaft section arranged sequentially. The end of the main shaft section away from the mounting shaft section is connected to the end of the moving disc valve away from the stationary disc valve. The shaft diameter of the mounting shaft section is smaller than that of the main shaft section, so that a first axial stop surface is formed between the mounting shaft section and the main shaft section. The impeller drive assembly includes a drive impeller and a first clamping nut. The drive impeller is fixedly mounted on the mounting shaft section. The first clamping nut is threadedly connected to the mounting shaft section on the side of the drive impeller away from the first axial stop surface, so as to lock the drive impeller between the first clamping nut and the first axial stop surface.

[0016] In one embodiment of the present invention, a thrust seat is provided between one end of the end connector extending into the modulation sleeve and the screw stator. The opposite ends of the thrust seat abut against the end connector and the screw stator respectively, and the thrust seat is provided with a liquid flow channel connecting the end connector and a fifth flow hole in the inner cavity of the screw stator.

[0017] In one embodiment of the present invention, the backwave module further includes a clamping sleeve, which is sleeved on the mandrel connector and located between the piston body and the first elastic reset member.

[0018] In one embodiment of the present invention, the end of the mandrel connector extending into the modulation sleeve includes a first shaft segment and a second shaft segment arranged sequentially. The shaft diameter of the second shaft segment is smaller than that of the first shaft segment, so that a second axial stop surface is formed between the second shaft segment and the first shaft segment. The first elastic reset member and the clamping sleeve are fitted onto the first shaft segment. The backwave module also includes a second clamping nut, which is threadedly connected to the second shaft segment so as to lock the piston body between the second clamping nut and the second axial stop surface.

[0019] In one embodiment of the present invention, the increasing sequence is an arithmetic sequence.

[0020] In one embodiment of the present invention, the moving valve disc faces the back wave module, and the stationary valve disc is located on the side of the moving valve disc away from the back wave module.

[0021] In one embodiment of the present invention, the modulation sleeve includes a sleeve body and an end cap. The sleeve body forms a cavity for accommodating the backwave module and the pulse wave module. The sleeve body has an end cap and an end connector at opposite ends. The end cap and the end connector are threaded to the sleeve body. The end cap has an installation through hole for the mandrel connector to pass through.

[0022] To achieve the above objectives, a second aspect of the present invention provides a drilling tool, wherein the drilling tool includes a modulation system based on the above-described vibrations of the same frequency but different phases.

[0023] To achieve the above objectives, a third aspect of the present invention provides a modulation method, wherein the modulation method is applied to a drill bit according to the above description, and includes: The injection flow rate of the drilling fluid is adjusted to the preset working flow rate so that the pulse wave modules in each vibration modulation device generate pulse waves of the same frequency but different phases and apply them to the corresponding piston bodies.

[0024] In one embodiment of the present invention, the modulation method further includes: The injection displacement of drilling fluid is adjusted to the initial positioning displacement so that the moving valve disc in each vibration modulation device rotates under the drive of the impeller drive assembly until the elastic positioning assembly extends into the positioning groove. The initial positioning displacement is less than the preset working displacement. Increase the injection flow rate of drilling fluid to the preset working flow rate so that the moving disc valve in each vibration modulation device moves to the first connecting shaft and extends into the polygonal hole section, so that it can rotate under the drive of the screw rotor and generate pulse waves of the same frequency but different phases to be applied to the corresponding piston body.

[0025] Through the above technical solution, the modulation system for vibrations of the same frequency but different phases provided in the embodiments of the present invention has the following beneficial effects: When using the above-described modulation system, since it includes at least two vibration modulation devices, the first water drive assembly of the pulse wave module in each vibration modulation device rotates when drilling fluid is introduced. The moving disc valve rotates along with the first water drive assembly, and the stationary disc valve is set to stop rotation, which allows the flow area of ​​the pulse disc valve assembly to be changed. The change in flow area causes the fluid pressure outside the pulse disc valve assembly to change between increasing and releasing, thereby applying pulse wave pressure to the piston body of the backwave module. Under the action of pulse wave pressure, the piston body can generate backwave vibration and drive the mandrel joint to apply a backwave force axially to the drill pipe short section at the rear end. At the same time, at least two vibration modulation devices are arranged sequentially at intervals along the length of the drill pipe, and the moving disc valve arranged sequentially from front to back is set as... The phase angles are sequentially arranged in an increasing sequence in the opposite direction to the rotation of the moving disc valve, so that the pulse wave modules in the vibration modulation devices arranged sequentially from front to back generate pulse waves of the same frequency but different phases, which are applied to the corresponding piston bodies, thereby applying backward wave vibrations with the same characteristics to the drill pipe short section at the rear end. This generates a continuous backward wave that is transmitted along the length of the drill pipe. Under the action of friction between the drill pipe and the well wall, the drill pipe can actively creep forward and drill. The modulation system provided by this invention realizes active modulation of excitation and drag reduction, gives full play to the synergistic effect between various vibration modulation devices, improves the vibration drag reduction effect, maximizes the release of drilling pressure and torque, and thus enables the drill bit to drill quickly, further improving drilling speed and reducing drilling costs.

[0026] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the drill string according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a vibration modulation device according to an embodiment of the present invention; Figure 3 This is a partial structural schematic diagram of a pulse wave module according to an embodiment of the present invention; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is a partial structural schematic diagram of a backwave module according to an embodiment of the present invention; Figure 6This is a schematic diagram of the radial section where the stationary disc valve is located according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the radial section of the moving disc valve with a phase angle of 0° according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the radial section of the moving disc valve with a phase angle of θ according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the radial section of the moving disc valve with a phase angle of 2θ according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures: 10. Vibration modulation device; 20. Drill bit; 100. Modulation short section module; 110. Modulation sleeve; 111. Sleeve body; 112. End cap; 113. First step surface; 114. Second step surface; 115. Third step surface; 120. Mandrel joint; 121. Second axial stop surface; 130. End joint; 200. Backward wave module; 210. Piston body; 220. First elastic reset element; 230. Clamping sleeve; 240. Second clamping nut; 300. Pulse wave module; 310. Screw drive assembly; 311. Screw stator; 312. Screw rotor; 320. Disc valve seat; 330. Stationary disc valve; 33 1. First flow passage; 332. Anti-rotation groove; 340. Moving disc valve; 341. Second flow passage; 342. Third flow passage; 343. Positioning groove; 344. First connecting shaft; 345. Second connecting shaft; 350. Flexible connector; 360. Elastic positioning assembly; 361. Mounting plug; 362. Third elastic reset component; 363. Positioning ball; 370. Anti-rotation shaft; 380. Impeller drive assembly; 381. Drive impeller; 382. First clamping nut; 390. Straightening sleeve; 391. Straightening mounting hole; 392. Fourth flow passage; 393. Second elastic reset component; 400. Thrust seat; 401. Fifth flow passage. Detailed Implementation

[0029] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] The modulation system, drilling tool, and modulation method of the present invention for vibrations of the same frequency but different phases are described below with reference to the accompanying drawings.

[0031] like Figure 1 and Figure 2 As shown, the present invention provides a modulation system for vibrations of the same frequency but different phases, wherein the modulation system includes at least two vibration modulation devices 10, and the vibration modulation device 10 includes: The modulation sub module 100 includes a modulation sleeve 110, a mandrel connector 120 passing through the rear end of the modulation sleeve 110, and an end connector 130 that docks with the front end of the modulation sleeve 110. Both the mandrel connector 120 and the end connector 130 are used to connect to the drill pipe sub and both have fluid flow channels. The backwave module 200 includes a piston body 210 and a first elastic reset member 220. The piston body 210 is located at one end of the spindle joint 120 that extends into the modulation sleeve 110. The piston body 210 is fitted to the inner peripheral wall of the modulation sleeve 110. The first elastic reset member 220 is provided between the piston body 210 and the inner end wall of the modulation sleeve 110. The pulse wave module 300 includes a first water drive assembly and a pulse disc valve assembly arranged sequentially between the back wave module 200 and the end connector 130 along the axial direction of the modulation sleeve 110. The stationary disc valve 330 in the pulse disc valve assembly is anti-rotation, and the moving disc valve 340 is rotatably arranged and connected to the first water drive assembly. The moving disc valve 340 is used to rotate under the drive of the first water drive assembly to apply pulse wave pressure to the piston body 210 by changing the flow area of ​​the pulse disc valve assembly. In this configuration, at least two vibration modulation devices 10 are arranged sequentially at intervals along the length of the drill rod, and the moving disc valves 340 arranged sequentially from front to back are arranged sequentially with increasing phase angles in the opposite direction to the rotation of the moving disc valves 340.

[0032] When using the above-described modulation system, since it includes at least two vibration modulation devices 10, the first water drive assembly of the pulse wave module 300 in each vibration modulation device 10 rotates when drilling fluid is introduced. The moving disc valve 340 rotates with the first water drive assembly, and the stationary disc valve 330 is set to stop rotation, which allows the flow area of ​​the pulse disc valve assembly to be changed. The change in flow area causes the fluid pressure outside the pulse disc valve assembly to change between increase and release, thereby applying pulse wave pressure to the piston body 210 of the back wave module 200. Under the action of the pulse wave pressure, the piston body 210 can generate back vibration and drive the mandrel joint 120 to apply back wave force axially to the drill pipe short section at the rear end. At the same time, at least two vibration modulation devices 10 are arranged sequentially at intervals along the length of the drill pipe, and the moving disc valve 340 is arranged sequentially from front to back. The disc valves 340 are arranged sequentially with increasing phase angles in the opposite direction to the rotation of the moving disc valve 340. This allows the pulse wave modules 300 in the vibration modulation devices 10, arranged sequentially from front to back, to generate pulse waves of the same frequency but different phases, which are then applied to the corresponding piston bodies 210. This, in turn, applies backward wave vibrations with the same characteristics to the drill pipe sub at the rear end, generating continuous backward waves that propagate along the length of the drill pipe. Under the action of friction between the drill pipe and the well wall, the drill pipe can actively creep forward during drilling. The modulation system provided by this invention achieves active modulation of vibration and drag reduction, leveraging the synergistic effect between the various vibration modulation devices 10, improving the vibration drag reduction effect, maximizing the release of drilling pressure and torque, and enabling the drill bit 20 to drill rapidly, further improving drilling speed and reducing drilling costs. It should be noted that the modulation system provided by this invention is particularly suitable for drill pipes connected to horizontal well sections, but is not limited to this. Drill pipes in other types of well sections connected to the modulation system provided by this invention should also fall within the protection scope of this invention.

[0033] Specifically, in this invention, the front end refers to the end closer to the drill bit 20, and the rear end refers to the end farther from the drill bit 20. That is, the end connector 130 on the modulation sleeve 110 is connected to the one of the two adjacent drill pipe sections closest to the drill bit 20, and the mandrel connector 120 is connected to the one farther from the drill bit 20. Drilling fluid can be injected into the modulation sleeve 110 along the fluid passage of the mandrel connector 120 and flow out from the fluid passage of the end connector 130. The first water drive assembly can rotate under the water drive action of the drilling fluid, and drive the moving disc valve 340 in the pulse disc valve assembly to rotate. Both the moving disc valve 340 and the stationary disc valve 330 in the pulse disc valve assembly have flow holes, and the flow holes of the two are always connected during the rotation of the moving disc valve 340, but the flow area of ​​the connected flow changes. When the flow area is at its minimum, the fluid pressure can reach its peak value, applying pulse wave pressure to the piston body 210. In addition, a seal is provided between the inner wall of the piston body 210 and the spindle joint 120, and a seal is provided between the outer wall of the piston body 210 and the inner wall of the modulation sleeve 110. When the piston body 210 is subjected to pulse wave pressure, it can drive the spindle joint 120 to move backward and compress the first elastic reset member 220. The first elastic reset member 220 stores elastic potential energy so as to drive the piston body 210 to drive the spindle joint 120 to reset. The first elastic reset member 220 includes, but is not limited to, a disc spring.

[0034] More specifically, at least two vibration modulation devices 10 can be sequentially arranged along the length of the drill pipe within the horizontal well section. For example, if there are three vibration modulation devices 10, and the moving disc valve 340 rotates clockwise, if the phase angle of the first moving disc valve 340 located at the foremost position is set to 0°, specifically as follows: Figure 7 As shown, at the same moment, the phase angle of the second moving disc valve 340, which is set sequentially, can be θ. That is, the second moving disc valve 340 is set to rotate the first moving disc valve 340 counterclockwise by an angle θ, as shown in the figure. Figure 8 As shown, the phase angle of the third moving disc valve 340 can be 2θ, that is, the third moving disc valve 340 is set to rotate the first moving disc valve 340 counterclockwise by an angle of 2θ, as shown in the figure. Figure 9 As shown, 0°, θ, and 2θ are not only increasing sequences, but also arithmetic sequences. Of course, this invention is not limited to this; any increasing sequence is acceptable. Furthermore, the value of θ can be optimized based on drill string dynamics theory.

[0035] See Figure 2 as well as Figures 6 to 9In one embodiment of the present invention, the stationary disc valve 330 is provided with at least two first flow holes 331, which are evenly spaced on a first circumference with the center line of the rotating shaft of the moving disc valve 340 as the center line. The moving disc valve 340 is provided with a second flow hole 341 and a third flow hole 342, the number of the second flow holes 341 and the third flow holes 342 being the same as the number of the first flow holes 331. The second flow holes 341 and the third flow holes 342 are alternately and evenly spaced on the first circumference. The arc length of the first flow hole 331 on the first circumference is greater than the arc length of the solid portion between the adjacent second flow holes 341 and the third flow holes 342 on the first circumference, and less than the arc length between the centers of the adjacent second flow holes 341 and the third flow holes 342 on the first circumference. This ensures that when the second flow-through orifice 341 rotates to a position initially offset from the first flow-through orifice 331, the third flow-through orifice 342 has already rotated to a point where a portion begins to communicate with the first flow-through orifice 331. This guarantees that the pulse disc valve assembly can flow throughout the rotation of the moving disc valve 340. Simultaneously, the existence of a solid portion between the second and third flow-through orifices 341 and 342 allows for changes in the flow area during the rotation of the moving disc valve 340, resulting in pressure increases and releases, thus creating a pulse wave effect. Specifically, the diameter of the third flow-through orifice 342 can be set to be smaller than the diameter of the second flow-through orifice 341, and the diameter of the second flow-through orifice 341 can be set to be smaller than the diameter of the first flow-through orifice 331. Of course, the present invention is not limited to this. Alternatively, a first flow passage 331 can be provided on the stationary disc valve 330, and an annular opening can be provided on the moving disc valve 340. The annular opening has a first opening segment and a second opening segment arranged alternately in sequence. The opening size of the first opening segment in the radial direction is smaller than the opening size of the second opening segment in the radial direction, which can also realize the change of flow area.

[0036] In one embodiment of the present invention, the phase angle difference ∆θ between the moving disc valves 340 in two adjacent vibration modulation devices 10 is less than 360° / n, where n represents the number of first flow orifices 331. Specifically, the number of first flow orifices 331 is set to four, and the phase angle difference between the moving disc valves 340 in two adjacent vibration modulation devices 10 is less than 90°. This allows the latter of the two adjacent vibration modulation devices 10 to generate a pulse wave between the two pulse waves generated by the former. More specifically, when the number of first flow passages 331 is set to four, the number of second flow passages 341 and third flow passages 342 is also four. That is, the included angle between the second flow passages 341 and the third flow passages 342 adjacent to each other on the moving disc valve 340 is set to 45°. The phase angle difference between the moving disc valves 340 in the two adjacent vibration modulation devices 10 is preferably less than 45°, such as 15°, 20°, 30°, etc. When the phase angle difference between the moving disc valves 340 in the two adjacent vibration modulation devices 10 is 15°, if the phase angle of the first moving disc valve 340 at the front end is set to 0°, at the same time, the phase angle of the second moving disc valve 340 arranged sequentially can be 15°, and the phase angle of the third moving disc valve 340 can be 30°.

[0037] See Figure 2 In one embodiment of the present invention, the first water drive assembly is a screw drive assembly 310. The screw drive assembly 310 includes a screw stator 311 fixedly disposed within the modulation sleeve 110 and a screw rotor 312 rotatably disposed within the screw stator 311. Specifically, the structure of the screw rotor 312 can be configured to be consistent with the screw drill bit. Drilling fluid flows along the spiral grooves on the screw rotor 312 and drives the screw rotor 312 to perform planetary rotation within the screw stator 311. The screw rotor 312 is connected to the moving disc valve 340 via a flexible connector 350 and is used to drive the moving disc valve 340 to rotate when drilling fluid is injected. The screw rotor 312 and the moving disc valve 340 are connected via the flexible connector 350 so that power can be transmitted between the planetary rotating screw rotor 312 and the fixed-axis rotating moving disc valve 340. Further, the flexible connector 350 can be a universal connector. In addition, the first water drive assembly can also be configured as an impeller drive assembly 380. However, the screw drive assembly 310 has a hard torque characteristic, which will result in a higher rotational speed under normal operating displacement of drilling fluid injection compared to the impeller drive assembly 380 with a soft torque characteristic.

[0038] See Figures 2 to 4In one embodiment of the present invention, the peripheral walls of the moving disc valve 340 and the stationary disc valve 330 are respectively provided with positioning grooves 343 and anti-rotation grooves 332. The positioning grooves 343 and anti-rotation grooves 332 are both axially extended on the corresponding disc valves. The pulse disc valve assembly also includes a disc valve seat 320 fixedly disposed in the modulation sleeve 110. Specifically, the disc valve seat 320 and the modulation sleeve 110 can be installed with an interference fit. The moving disc valve 340 and the stationary disc valve 330 are stacked sequentially along the axial direction of the modulation sleeve 110 and can be axially movable in the disc valve seat 320. Further, the opposite ends of the disc valve seat 320 are open, so that the sides of the moving disc valve 340 and the stationary disc valve 330 that are opposite to each other are exposed. The outer peripheral walls of the moving disc valve 340 and the stationary disc valve 330 are respectively fitted to the inner peripheral wall of the disc valve seat 320. The disc valve seat 320 is provided with an elastic positioning component 360 corresponding to the moving disc valve 340, which can extend into or retract from the positioning groove 343. The addition of the elastic positioning component 360 can play a role in the initial positioning of the moving disc valve 340, so that each moving disc valve 340 is set according to the corresponding phase angle. The disc valve seat 320 is provided with an anti-rotation shaft 370 corresponding to the stationary disc valve 330, which extends into the anti-rotation groove 332 and abuts against the stationary disc valve 330. The addition of the anti-rotation shaft 370 can realize the anti-rotation setting of the stationary disc valve 330. Since both the positioning groove 343 and the anti-rotation groove 332 are designed to extend axially, the moving disc valve 340... While the stationary disc valve 330 moves, the elastic positioning component 360 and the anti-rotation shaft 370 can move within their respective slots. Furthermore, the moving disc valve 340 has a first connecting shaft portion 344 and a second connecting shaft portion 345 at opposite ends. The first connecting shaft portion 344 faces the stationary disc valve 330 and passes through it. The radial cross-section of the first connecting shaft portion 344 is polygonal. The pulse wave module 300 also includes an impeller drive component 380 and a straightening sleeve 390. The straightening sleeve 390 is axially positioned between the screw drive component 310 and the pulse disc valve component. The straightening sleeve 390 is connected to the screw rotor 312 via a flexible connector 350. The straightening sleeve 390 has a straightening mounting hole 3. The fourth flow passage 392 and the centering mounting hole 391 are located on the center line of the rotating shaft of the moving disc valve 340 and are for the first connecting shaft 344 to pass through. Multiple fourth flow passages 392 can be arranged sequentially around the centering mounting hole 391. The centering mounting hole 391 has a circular hole segment and a polygonal hole segment on its end face facing the pulse disc valve assembly. The radial cross-section of the circular hole segment is the circumcircle of the first connecting shaft 344, and the polygonal hole segment has the same shape as the radial cross-section of the first connecting shaft 344. A second elastic reset member 393 is provided between the centering sleeve 390 and the stationary disc valve 330. The impeller drive assembly 380 is located on the second connecting shaft 345. This arrangement allows the moving disc valve 340 to be initially positioned only by the impeller drive assembly 380 before the screw drive assembly 310 drives it to rotate, ensuring positional accuracy.

[0039] Specifically, first, a low-volume drilling fluid is injected. At this time, the volume is low, and the throttling pressure on the moving disc valve 340 is low, which cannot push the moving disc valve 340 and the stationary disc valve 330 toward the centralizing sleeve 390. The first connecting shaft 344 of the moving disc valve 340 is in the circular hole section. The moving disc valve 340 and the centralizing sleeve 390 rotate independently and automatically. The drilling fluid drives the impeller 381 drive assembly to drive the moving disc valve 340 to rotate until the moving disc valve 340 rotates to align with the positioning groove 343 and the elastic positioning assembly 360, so that the elastic positioning assembly 360 extends into the positioning groove 343 to restrict the rotation of the moving disc valve 340 and achieve initial positioning. Then, the injection rate of the drilling fluid is increased to the normal operating rate. At this time, the rate is higher, and the throttling pressure on the moving disc valve 340 and the stationary disc valve 330 is higher, which can push the moving disc valve 340 and the stationary disc valve 330 toward the centralizing sleeve 390 and compress the first elastic reset member 220 until the first connecting part of the moving disc valve 340 extends into the polygonal hole section. The radial cross section of the polygonal hole section and the first connecting shaft part 344 are set to have the same shape, thereby realizing the connection between the first connecting part and the centralizing sleeve 390. The screw rotor 312 of the screw drive assembly 310 overcomes the restriction of the elastic positioning assembly 360 and drives the moving disc valve 340 to rotate. Since the rotation speed of the screw rotor 312 is only related to the rate of discharge, under the condition of constant rate of discharge, all the moving disc valves 340 have the same rotation speed and maintain a constant phase difference. Furthermore, after the drilling fluid injection is completed, the second elastic reset member 393 can elastically drive the moving disc valve 340 and the stationary disc valve 330 to reset. The second elastic reset member 393 is sleeved on the outside of the first connecting shaft portion 344 and can be configured as a disc spring. Of course, the present invention is not limited to this, and the second elastic reset member 393 can also be configured as other suitable elastic members.

[0040] In one embodiment of the present invention, the disc valve seat 320 is provided with a first mounting hole corresponding to the movable disc valve 340. The elastic positioning component 360 is placed in the first mounting hole and includes a mounting plug 361, a third elastic reset member 362, and a positioning ball 363 arranged sequentially. The third elastic reset member 362 is used to drive the positioning ball 363 into the positioning groove 343 when elastically extended, and to drive the positioning ball 363 out of the positioning groove 343 when elastically compressed. Specifically, the opposite ends of the third elastic reset member 362 can be pre-connected to the mounting plug 361 and the positioning ball 363 respectively, and then the elastic positioning component 360 can be placed in the first mounting hole, which can facilitate disassembly and assembly. In addition, the third elastic reset member 362 can be a spring member. Of course, the present invention is not limited to this. The elastic positioning component 360 does not need to be provided with a mounting plug 361. The end of the third elastic reset member 362 away from the positioning ball 363 is connected to the disc valve seat 320 or the modulation sleeve 110, and the third elastic reset member 362 can also be other suitable elastic members.

[0041] In one embodiment of the present invention, the disc valve seat 320 is provided with a second mounting hole corresponding to the stationary disc valve 330, and the modulation sleeve 110 is provided with a third mounting hole communicating with the second mounting hole. The anti-rotation shaft 370 passes through the third mounting hole and the second mounting hole in sequence and extends into the anti-rotation groove 332 to abut against the stationary disc valve 330. That is, during installation, the pulse disc valve assembly can be placed in the modulation sleeve 110 first, and the second mounting hole can be aligned with the third mounting hole. Then, the anti-rotation shaft 370 can be inserted from the outside of the modulation sleeve 110 through the third mounting hole and the second mounting hole in sequence and into the anti-rotation groove 332, thereby facilitating the assembly and disassembly of the anti-rotation shaft 370. Of course, the present invention is not limited to this, and the anti-rotation shaft 370 can also be provided only on the disc valve seat 320.

[0042] See Figure 2 and Figure 3 In one embodiment of the present invention, the inner wall of the modulation sleeve 110 is provided with a first stepped surface 113, a second stepped surface 114, and a third stepped surface 115 at intervals along its length. The first stepped surface 113, the second stepped surface 114, and the third stepped surface 115 are located between the piston body 210 and the screw drive assembly 310 and are all disposed towards the piston body 210. The first stepped surface 113 axially abuts against the end of the disc valve seat 320 away from the piston body 210, thereby axially limiting the piston body 210 through the first stepped surface 113. The first elastic reset member 220 The space between the first step surface 113 and the second step surface 114 is provided, and the end of the second elastic reset member 393 facing away from the piston body 210 is axially abutted against the second step surface 114, so that the second elastic reset member 393 can be axially limited by the second step surface 114. The straightening sleeve 390 is placed in the space between the second step surface 114 and the third step surface 115, and the end of the straightening sleeve 390 facing away from the piston body 210 is axially abutted against the third step surface 115, so that the straightening sleeve 390 can be axially limited by the third step surface 115.

[0043] See Figure 2In one embodiment of the present invention, the second connecting shaft portion 345 includes a main shaft section and a mounting shaft section arranged sequentially. The end of the main shaft section away from the mounting shaft section is connected to the end of the moving disc valve 340 opposite to the stationary disc valve 330. The shaft diameter of the mounting shaft section is smaller than that of the main shaft section, so that a first axial stop surface is formed between the mounting shaft section and the main shaft section. The impeller drive assembly 380 includes a drive impeller 381 and a first clamping nut 382. The drive impeller 381 is fitted onto the mounting shaft section. The first clamping nut 382 is threadedly connected to the mounting shaft section on the side of the drive impeller 381 opposite to the first axial stop surface, so that the drive impeller 381 can be locked between the first clamping nut 382 and the first axial stop surface. Thus, by setting the first clamping nut 382 and the first axial stop surface, the drive impeller 381 can be detachably installed on the second connecting shaft portion 345, which facilitates disassembly and assembly.

[0044] In one embodiment of the present invention, a thrust seat 400 is provided between one end of the end connector 130 extending into the modulation sleeve 110 and the screw stator 311. The opposite ends of the thrust seat 400 abut against the end connector 130 and the screw stator 311, respectively. The thrust seat 400 is provided with a fifth flow hole 401 connecting the fluid passage of the end connector 130 and the inner cavity of the screw stator 311. The addition of the thrust seat 400 serves to axially limit the movement of the screw stator 311. Specifically, the end of the end connector 130 extending into the modulation sleeve 110 is threadedly connected to the modulation sleeve 110.

[0045] See Figure 2 and Figure 5 In one embodiment of the present invention, the backwave module 200 further includes a clamping sleeve 230, which is sleeved on the spindle connector 120 and located between the piston body 210 and the first elastic reset member 220. That is, by adding the clamping sleeve 230, the stability of the deformation of the first elastic reset member 220 can be ensured.

[0046] In one embodiment of the present invention, the end of the mandrel connector 120 extending into the modulation sleeve 110 includes a first shaft segment and a second shaft segment arranged sequentially. The shaft diameter of the second shaft segment is smaller than that of the first shaft segment, so that a second axial stop surface 121 is formed between the second shaft segment and the first shaft segment. The first elastic reset member 220 and the clamping sleeve 230 are fitted onto the first shaft segment. The backwave module 200 also includes a second clamping nut 240, which is threadedly connected to the second shaft segment, so as to lock the piston body 210 between the second clamping nut 240 and the second axial stop surface 121. That is, by adding the second axial stop surface 121 and the second clamping nut 240, the piston body 210 can be detachably installed on the mandrel connector 120, which facilitates disassembly and assembly.

[0047] like Figure 2As shown, in one embodiment of the present invention, the moving valve disc faces the backwash module 200, and the stationary valve 330 is located on the side of the moving valve disc away from the backwash module 200. Specifically, when the screw drive assembly 310 is configured as a first water drive assembly, the first water drive assembly can be located on the side of the stationary valve disc away from the moving valve disc.

[0048] Please see again Figure 2 In one embodiment of the present invention, the modulation sleeve 110 includes a sleeve body 111 and an end cap 112. The sleeve body 111 forms a cavity for accommodating the backwave module 200 and the pulse wave module 300. The sleeve body 111 has an end cap 112 and an end connector 130 at opposite ends. Both the end cap 112 and the end connector 130 are threadedly connected to the sleeve body 111. The end cap 112 has a mounting through hole for the mandrel connector 120 to pass through. By splitting the modulation sleeve 110 into the sleeve body 111 and the end cap 112, it is convenient to assemble and disassemble the backwave module 200 and the pulse wave module within the modulation sleeve 110.

[0049] Furthermore, the present invention also provides a drilling tool, wherein the drilling tool includes a modulation system based on the above-described vibrations of the same frequency but different phases. Since the drilling tool employs all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0050] Furthermore, the present invention provides a modulation method, wherein the modulation method is applied to the drill bit according to the above description, and includes: The injection flow rate of the drilling fluid is adjusted to the preset working flow rate so that the pulse wave modules 300 in each vibration modulation device 10 generate pulse waves of the same frequency but different phases and apply them to the corresponding piston body 210.

[0051] Specifically, the preset working displacement can be the normal working displacement. Under the normal working displacement, the first water drive component in each vibration modulation device 10 drives the moving valve disc to rotate at the normal working speed. Since the moving valve disc is at different phase angles, pulse waves with the same frequency but different phases can be generated and applied to the corresponding piston body 210, thereby applying the same backward wave vibration to the drill pipe short section at the rear end. This generates a continuous backward wave transmitted along the length of the drill pipe. Under the action of friction between the drill pipe and the well wall, the drill pipe can actively creep forward and drill. The modulation method provided by the present invention realizes active modulation of excitation and drag reduction, improves the vibration drag reduction effect, and enables the drill bit 20 to drill quickly, further improving the drilling speed and reducing the drilling cost.

[0052] In one embodiment of the present invention, the modulation method further includes: The injection displacement of drilling fluid is adjusted to the initial positioning displacement so that the moving valve disc in each vibration modulation device 10 rotates under the drive of the impeller drive assembly 380 until the elastic positioning assembly 360 extends into the positioning groove 343, wherein the initial positioning displacement is less than the preset working displacement. The injection flow rate of drilling fluid is increased to the preset working flow rate so that the moving disc valve 340 in each vibration modulation device 10 moves to the first connecting shaft 344 and extends into the polygonal hole section, so that it can rotate under the drive of the screw rotor 312 and generate pulse waves of the same frequency but different phases to be applied to the corresponding piston body 210.

[0053] Specifically, the modulation method provided in this embodiment is applicable to modulation systems capable of achieving initial positioning. First, a low-volume drilling fluid is injected. At this time, the volume is low, and the throttling pressure on the moving disc valve 340 is low, which prevents the moving disc valve 340 and the stationary disc valve 330 from moving towards the centralizing sleeve 390. The first connecting shaft portion 344 of the moving disc valve 340 is located in the circular hole section. The moving disc valve 340 and the centralizing sleeve 390 rotate independently and automatically. The drilling fluid drives the impeller 381 drive assembly to drive the moving disc valve 340 to rotate until the moving disc valve 340 rotates to align with the positioning groove 343 and the elastic positioning assembly 360, so that the elastic positioning assembly 360 extends into the positioning groove 343 to restrict the rotation of the moving disc valve 340, thereby achieving initial positioning. Then, the injection rate of the drilling fluid is increased to the normal operating rate. At this time, the rate is higher, and the throttling pressure on the moving disc valve 340 and the stationary disc valve 330 is higher, which can push the moving disc valve 340 and the stationary disc valve 330 toward the centralizing sleeve 390 and compress the first elastic reset member 220 until the first connecting part of the moving disc valve 340 extends into the polygonal hole section. The radial cross section of the polygonal hole section and the first connecting shaft part 344 are set to have the same shape, thereby realizing the connection between the first connecting part and the centralizing sleeve 390. The screw rotor 312 of the screw drive assembly 310 overcomes the restriction of the elastic positioning assembly 360 and drives the moving disc valve 340 to rotate. Since the rotation speed of the screw rotor 312 is only related to the rate of discharge, under the condition of constant rate of discharge, all the moving disc valves 340 have the same rotation speed and maintain a constant phase difference.

[0054] Therefore, this invention constructs pulse vibration modulation to generate vibrations of the same frequency but different phases within the drill string system. This vibration induces continuous axial backward waves in the drill string system, causing the drill string to creep forward under the friction between the drill string system and the wellbore. Compared to existing vibration drag reduction technologies, this technology, by modulating the excitation load on the drill string system, can induce the drill string system to actively move forward, achieving a shift from friction reduction to friction utilization. This has a significant promoting effect on rock-breaking load transfer in well types such as long horizontal wells and complex wellbore trajectories, thereby achieving the goal of increasing the ultimate wellbore extension distance and improving speed and efficiency.

[0055] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A modulation system for vibrations at the same frequency but different phases, characterized in that, The modulation system includes at least two vibration modulation devices (10), each vibration modulation device (10) comprising: The modulation sub module (100) includes a modulation sleeve (110), a mandrel connector (120) passing through the rear end of the modulation sleeve (110), and an end connector (130) docking with the front end of the modulation sleeve (110). The mandrel connector (120) and the end connector (130) are both used to connect to the drill pipe sub and both have fluid flow channels. The backwave module (200) includes a piston body (210) and a first elastic reset member (220). The piston body (210) is located at one end of the mandrel connector (120) that extends into the modulation sleeve (110). The piston body (210) is fitted against the inner peripheral wall of the modulation sleeve (110). The first elastic reset member (220) is provided between the piston body (210) and the inner end wall of the modulation sleeve (110). The pulse wave module (300) includes a first water drive assembly and a pulse disc valve assembly arranged sequentially between the back wave module (200) and the end connector (130) along the axial direction of the modulation sleeve (110). The stationary disc valve (330) in the pulse disc valve assembly is anti-rotation configured, and the moving disc valve (340) is rotatably configured and connected to the first water drive assembly. The moving disc valve (340) is used to rotate under the drive of the first water drive assembly to apply pulse wave pressure to the piston body (210) by changing the flow area of ​​the pulse disc valve assembly. Among them, at least two of the vibration modulation devices (10) are arranged at intervals along the length of the drill rod, and the moving disc valves (340) arranged in sequence from front to back are arranged in the opposite direction to the rotation of the moving disc valves (340) with an increasing phase angle.

2. The modulation system for vibrations of the same frequency but different phases according to claim 1, characterized in that, The stationary disc valve (330) is provided with at least two first flow holes (331), which are evenly spaced on a first circumference centered on the rotation axis of the moving disc valve (340). The moving disc valve (340) is provided with a second flow hole (341) and a third flow hole (342), the number of which is the same as the number of which is the number of which is the first flow hole (331), and the diameter of which is smaller than that of which is the first flow hole (341). The diameter of the two flow holes (341) is such that the second flow hole (341) and the third flow hole (342) are arranged alternately and evenly on the first circumference. The arc length of the first flow hole (331) on the first circumference is set to be greater than the arc length of the solid portion between the adjacent second flow hole (341) and the third flow hole (342) on the first circumference, and less than the arc length between the centers of the adjacent second flow hole (341) and the third flow hole (342) on the first circumference.

3. The modulation system for vibrations of the same frequency but different phases according to claim 2, characterized in that, The number of the first flow passage (331) is set to four, and the phase angle difference between the moving disc valves (340) in two adjacent vibration modulation devices (10) is less than 90°; And / or, the phase angle difference ∆θ of the moving disc valves (340) in two adjacent vibration modulation devices (10) is less than 360° / n, where n represents the number of the first flow holes (331).

4. The modulation system for vibrations of the same frequency but different phases according to claim 2, characterized in that, The first water drive assembly is configured as a screw drive assembly (310). The screw drive assembly (310) includes a screw stator (311) fixedly disposed in the modulation sleeve (110) and a screw rotor (312) rotatably disposed in the screw stator (311). The screw rotor (312) is connected to the moving disc valve (340) through a flexible connector (350) and is used to drive the moving disc valve (340) to rotate when drilling fluid is injected.

5. The modulation system for vibrations of the same frequency but different phases according to claim 4, characterized in that, The peripheral walls of the moving disc valve (340) and the stationary disc valve (330) are respectively provided with positioning grooves (343) and anti-rotation grooves (332). The positioning grooves (343) and the anti-rotation grooves (332) are both axially extended on the corresponding disc valves. The pulse disc valve assembly also includes a disc valve seat (320) fixedly disposed in the modulation sleeve (110). The moving disc valve (340) and the stationary disc valve (330) are stacked sequentially along the axial direction of the modulation sleeve (110) and can both be axially movable within the disc valve seat (320). The disc valve seat (320) corresponds to the moving disc valve (340) and the stationary disc valve (330). 340) An elastic positioning component (360) is provided that can extend into or retract from the positioning groove (343). The disc valve seat (320) is provided with an anti-rotation shaft (370) that extends into the anti-rotation groove (332) and abuts against the static disc valve (330) corresponding to the static disc valve (330). The moving disc valve (340) is provided with a first connecting shaft portion (344) and a second connecting shaft portion (345) at opposite ends. The first connecting shaft portion (344) faces the static disc valve (330) and passes through the static disc valve (330). The radial cross section of the first connecting shaft portion (344) is polygonal. The pulse wave module (300) further includes an impeller drive assembly (380) and a centralizing sleeve (390). The centralizing sleeve (390) is axially positioned between the screw drive assembly (310) and the pulse disc valve assembly. The centralizing sleeve (390) is connected to the screw rotor (312) via the flexible connector (350). The centralizing sleeve (390) is provided with a centralizing mounting hole (391) and a fourth flow hole (392). The centralizing mounting hole (391) is located on the center line of the rotating shaft of the moving disc valve (340) and provides power to the moving disc valve (340). The first connecting shaft portion (344) is inserted through it. The straightening mounting hole (391) is provided with a circular hole segment and a polygonal hole segment from the end face facing the pulse disc valve assembly. The radial cross section of the circular hole segment is set as the circumcircle of the first connecting shaft portion (344). The polygonal hole segment is set to have the same shape as the radial cross section of the first connecting shaft portion (344). A second elastic reset member (393) is provided between the straightening sleeve (390) and the stationary disc valve (330). The impeller drive assembly (380) is provided on the second connecting shaft portion (345).

6. The modulation system for vibrations of the same frequency but different phases according to claim 5, characterized in that, The disc valve seat (320) is provided with a first mounting hole corresponding to the moving disc valve (340). The elastic positioning component (360) is placed in the first mounting hole and includes a mounting plug (361), a third elastic reset member (362), and a positioning ball (363) arranged in sequence. The third elastic reset member (362) is used to drive the positioning ball (363) into the positioning groove (343) when it is elastically extended, and to drive the positioning ball (363) out of the positioning groove (343) when it is elastically compressed.

7. The modulation system for vibrations of the same frequency but different phases according to claim 5, characterized in that, The disc valve seat (320) is provided with a second mounting hole corresponding to the stationary disc valve (330). The modulation sleeve (110) is provided with a third mounting hole that communicates with the second mounting hole. The anti-rotation shaft (370) passes through the third mounting hole and the second mounting hole in sequence and extends into the anti-rotation groove (332) to abut against the stationary disc valve (330).

8. The modulation system for vibrations of the same frequency but different phases according to claim 5, characterized in that, The inner wall of the modulation sleeve (110) is provided with a first stepped surface (113), a second stepped surface (114), and a third stepped surface (115) at intervals along its length. The first stepped surface (113), the second stepped surface (114), and the third stepped surface (115) are located between the piston body (210) and the screw drive assembly (310) and are all oriented towards the piston body (210). The first stepped surface (113) axially abuts against the end of the disc valve seat (320) away from the piston body (210). The second elastic reset member (393) is placed in the space between the first step surface (113) and the second step surface (114), and the end of the second elastic reset member (393) away from the piston body (210) abuts axially with the second step surface (114). The straightening sleeve (390) is placed in the space between the second step surface (114) and the third step surface (115), and the end of the straightening sleeve (390) away from the piston body (210) abuts axially with the third step surface (115).

9. The modulation system for vibrations of the same frequency but different phases according to claim 5, characterized in that, The second connecting shaft (345) includes a main shaft section and a mounting shaft section arranged sequentially. The end of the main shaft section away from the mounting shaft section is connected to the end of the moving disc valve (340) away from the stationary disc valve (330). The shaft diameter of the mounting shaft section is smaller than that of the main shaft section, so that a first axial stop surface is formed between the mounting shaft section and the main shaft section. The impeller drive assembly (380) includes a drive impeller (381) and a first clamping nut (382). The drive impeller (381) is fitted onto the mounting shaft section. The first clamping nut (382) is threadedly connected to the mounting shaft section on the side of the drive impeller (381) away from the first axial stop surface, so that the drive impeller (381) can be locked between the first clamping nut (382) and the first axial stop surface.

10. The modulation system for vibrations of the same frequency but different phases according to claim 4, characterized in that, A thrust seat (400) is provided between one end of the end connector (130) that extends into the modulation sleeve (110) and the screw stator (311). The opposite ends of the thrust seat (400) abut against the end connector (130) and the screw stator (311) respectively. The thrust seat (400) is provided with a fifth flow hole (401) that connects the liquid flow channel of the end connector (130) and the inner cavity of the screw stator (311).

11. The modulation system for vibrations of the same frequency but different phases according to any one of claims 1 to 10, characterized in that, The backwave module (200) further includes a clamping sleeve (230), which is sleeved on the spindle connector (120) and located between the piston body (210) and the first elastic reset member (220).

12. The modulation system for vibrations of the same frequency but different phases according to claim 11, characterized in that, The mandrel connector (120) extends into one end of the modulation sleeve (110) and includes a first shaft segment and a second shaft segment arranged in sequence. The shaft diameter of the second shaft segment is smaller than that of the first shaft segment, so that a second axial stop surface (121) is formed between the second shaft segment and the first shaft segment. The first elastic reset member (220) and the clamping sleeve (230) are fitted onto the first shaft segment. The backwave module (200) also includes a second clamping nut (240), which is threadedly connected to the second shaft segment so that the piston body (210) can be locked between the second clamping nut (240) and the second axial stop surface (121).

13. The modulation system for vibrations of the same frequency but different phases according to any one of claims 1 to 10, characterized in that, The increasing sequence is an arithmetic sequence; And / or, the moving valve disc is disposed facing the back wave module (200), and the stationary valve disc is disposed on the side of the moving valve disc opposite to the back wave module (200); And / or, the modulation sleeve (110) includes a sleeve body (111) and an end cap (112), the sleeve body (111) forming a cavity for accommodating the backwave module (200) and the pulse wave module (300), and the end cap (112) and the end connector (130) are respectively provided at opposite ends of the sleeve body (111), the end cap (112) and the end connector (130) are threaded to the sleeve body (111), and the end cap (112) is provided with a mounting through hole for the spindle connector (120) to pass through.

14. A drilling tool, characterized in that, The drilling tool includes a modulation system for vibrations of the same frequency but different phases as described in any one of claims 1 to 13.

15. A modulation method, characterized in that, The modulation method is applied to the drill bit according to claim 14, and includes: The injection flow rate of the drilling fluid is adjusted to the preset working flow rate so that the pulse wave module (300) in each vibration modulation device (10) generates pulse waves of the same frequency but different phases and applies them to the corresponding piston body (210).

16. The modulation method according to claim 15, characterized in that, The modulation method further includes: The injection displacement of drilling fluid is adjusted to the initial positioning displacement so that the moving valve disc in each vibration modulation device (10) rotates under the drive of the impeller drive assembly (380) until the elastic positioning assembly (360) extends into the positioning groove (343), wherein the initial positioning displacement is less than the preset working displacement. The injection flow rate of drilling fluid is increased to the preset working flow rate so that the moving disc valve (340) in each vibration modulation device (10) moves to the first connecting shaft (344) and extends into the polygonal hole section so that it can rotate under the drive of the screw rotor (312) and generate pulse waves of the same frequency but different phases to be applied to the corresponding piston body (210).

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