Resonance-assisted rock breaking tool

Abstract

The invention belongs to the technical field of oil and gas drilling, and particularly relates to a resonance auxiliary rock breaking tool. The resonance-assisted rock breaking tool comprises: a housing; the vibration generating mechanism is arranged in the shell, and the vibration generating mechanism is constructed to be capable of responding to the pressure change of drilling fluid so as to generate vibration; the vibration generating mechanism is arranged in the shell, the frequency adjusting mechanism is arranged in the shell, an oscillation cavity is formed between the frequency adjusting mechanism and a first pressure face, used for responding to drilling fluid pressure, of the vibration generating mechanism, and the size of the oscillation cavity can be adjusted by adjusting the distance between the frequency adjusting mechanism and the vibration generating mechanism. And the vibration frequency is adjusted.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas drilling, and in particular relates to a resonance-assisted rock breaking tool. Background Art

[0002] As the depth of geological exploration increases, the rate of encountering difficult-to-drill formations gradually increases. The formations are hard, abrasive, and have poor drillability, requiring greater rock-breaking energy for successful drilling. To address the need to increase drilling speed in these difficult-to-drill formations, a variety of drilling speed-increasing tools have been developed, such as impact tools such as jet impactors, torque impactors, impact screw drills, oscillating screw drills, and tools to improve drilling conditions such as constant torque devices and hydraulic oscillators. Field tests and applications have proven that these tool technologies have a certain speed-increasing effect. However, there are still problems such as low drilling efficiency, rapid failure of drill tools and drill bits, and unstable results. In particular, the drillability parameters of ultra-hard formations place higher demands on tool performance, and the working performance of existing speed-increasing tools often cannot meet the needs of increasing drilling speed and efficiency.

[0003] Resonance percussion drilling is a drilling technique that applies periodic vibrations to rock at appropriate amplitudes and rotational speeds, promoting internal crack propagation and intensifying rock vibrations, leading to fracture. Specifically, when the frequency of the simple harmonic vibrations equals the rock's natural frequency, the rock resonates, experiencing maximum vibration displacement and susceptibility to damage. This is known as resonance drilling. Resonance-assisted rock breaking can reduce the difficulty of breaking, effectively avoiding the dramatic cost increases associated with simply improving drilling tool performance. This provides a new technical approach for increasing drilling speed and efficiency in hard and difficult formations. Summary of the Invention

[0004] In response to the above-mentioned technical problems, the present invention aims to provide a resonance-assisted rock breaking tool, which can adjust the vibration frequency of the drill bit.

[0005] According to the present invention, a resonance-assisted rock breaking tool is provided, comprising:

[0006] shell;

[0007] a vibration generating mechanism disposed within the housing, the vibration generating mechanism being configured to vibrate in response to a pressure change of the drilling fluid; and

[0008] A frequency adjustment mechanism is arranged in the shell, and an oscillation cavity is formed between the frequency adjustment mechanism and the first pressure surface of the vibration generating mechanism for responding to the drilling fluid pressure. By adjusting the distance of the frequency adjustment mechanism relative to the vibration generating mechanism, the size of the oscillation cavity can be adjusted, thereby adjusting the vibration frequency.

[0009] In a specific embodiment, the frequency adjustment mechanism includes an upper oscillating member, which includes a large diameter portion and a small diameter portion. The inner diameter of the large diameter portion is larger than the inner diameter of the small diameter portion, and the oscillation cavity is between the lower end surface of the small diameter portion and the first pressure surface.

[0010] In a specific embodiment, the large diameter portion and the vibration generating mechanism overlap in a partial length direction, and a first sealing member is provided at the overlapping position of the large diameter portion and the vibration generating mechanism.

[0011] In a specific embodiment, the upper oscillating member is connected to the housing via a thread, and the size of the oscillation cavity can be adjusted by rotating the upper oscillating member relative to the housing.

[0012] In a specific embodiment, an upper joint is provided at the upper end of the shell, a rotation adjustment cylinder is fixedly provided on the upper part of the upper oscillating member, the rotation adjustment cylinder is connected to the upper joint through a thread, and the rotation adjustment cylinder is connected to the upper oscillating member through a fastening screw.

[0013] In a specific embodiment, the vibration generating mechanism includes a piston assembly, the upper end surface of the piston assembly is a first pressure surface, the lower end surface of the piston assembly is a second pressure surface, and the axial projection area of ​​the first pressure surface is larger than that of the second pressure surface.

[0014] In a specific embodiment, at least one group of piston blocks and pressure blocks are arranged in the annulus between the piston assembly and the outer shell, and the radial inner and outer sides of the piston block and the pressure block are sealed with the piston assembly and the outer shell respectively, wherein the piston block is fixed to the outer shell, and the piston block is fixed to the piston assembly, and a first pressure transmission hole is provided on the corresponding piston assembly below the piston block.

[0015] In a specific embodiment, a second pressure transmission hole is provided in the housing at a position corresponding to the piston block, and a third pressure transmission hole is provided in the piston block for connecting the second pressure transmission hole with the upper end of the piston block.

[0016] In a specific embodiment, the piston assembly includes a lower oscillating member, an upper piston, and a lower piston that are fixedly connected in sequence from top to bottom, and the lower oscillating member and the lower piston are both sealed with the housing.

[0017] In a specific embodiment, a torque transmission shaft is fixedly provided in the housing through a torque transmission connection, a lower joint is provided at the lower end of the torque transmission shaft, and the lower piston is in axial contact with the torque transmission shaft.

[0018] Compared with the prior art, the advantages of this application are as follows.

[0019] The vibration generating mechanism of the present invention can oscillate in response to the pulse pressure of the drilling fluid, and the frequency regulating mechanism can change the vibration frequency of the vibration generating mechanism under the same drilling fluid pulse pressure. When the vibration frequency is close to the resonance frequency of the rock, it causes the rock to resonate, which can reduce the difficulty of its fracture and form volume crushing, thereby achieving the purpose of improving the rock breaking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described below with reference to the accompanying drawings.

[0021] Figure 1 A schematic diagram showing an embodiment of a resonance-assisted rock breaking tool according to the present invention is shown;

[0022] Figure 2 shows a partially enlarged schematic diagram of the vibration generating mechanism according to the present invention;

[0023] Figure 3 A schematic diagram showing an embodiment of a sealing assembly according to the present invention is shown;

[0024] Figure 4 and Figure 5 The vibration frequencies generated when the upper oscillating member and the lower oscillating member are at different axial distances are shown, where the horizontal axis is time and the vertical axis is vibration frequency.

[0025] In the figure: 1. Upper joint; 2. Rotating adjustment cylinder; 3. Housing; 31. Second pressure transmission hole; 4. Fastening screw; 5. Upper oscillating member; 51. Large diameter portion; 52. Small diameter portion; 6. First sealing member; 7. Lower oscillating member; 8. Second sealing member; 9. Third sealing member; 10. Piston block; 101. Third pressure transmission hole; 102. First piston block; 103. Second piston block; 104. Third piston block; 11. Fourth sealing member; 12. Upper piston; 13. Fifth sealing member; 14. Fixing screw; 15. Lower piston; 16. Torque transmission shaft; 17. Lower joint;

[0026] 100. Resonance-assisted rock breaking tools;

[0027] 200, vibration generating mechanism; 201, first pressure surface; 202, second pressure surface; 203, piston assembly; 204, pressure block; 205, first pressure transmission hole;

[0028] 300. Frequency adjustment mechanism;

[0029] 400. Oscillation cavity.

[0030] In this application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn to scale. DETAILED DESCRIPTION

[0031] The present invention will be described below with reference to the accompanying drawings.

[0032] It should be noted that, in this application, the direction of the resonance-assisted rock breaking tool according to the present invention approaching the wellhead after entering the well is described as "up" or similar terms, that is, Figure 1 The direction of the resonance-assisted rock breaking tool according to the present invention away from the wellhead after entering the well is described as "down" or similar terms, that is, Figure 1 Below.

[0033] Figure 1 FIG. 1 shows the structure of a resonance-assisted rock breaking tool 100 according to the present invention. Figure 1 As shown, the resonance-assisted rock breaking tool 100 includes a housing 3 , a vibration generating mechanism 200 and a frequency adjusting mechanism 300 .

[0034] In this embodiment, the housing 3 is configured to be cylindrical, and the vibration generating mechanism 200 and the frequency adjusting mechanism 300 are both coaxially disposed inside the housing 3 .

[0035] The vibration generating mechanism 200 is configured to oscillate in response to pulsed pressure changes in the drilling fluid. Furthermore, the upper end surface of the vibration generating mechanism 200 is configured as a first pressure surface 201, and the lower end surface of the vibration generating mechanism 200 is configured as a second pressure surface 202. The axial projection area of ​​the first pressure surface 201 is greater than the axial projection area of ​​the second pressure surface 202. When drilling fluid flows through the vibration generating mechanism 200, due to the pressure differential between the axial ends of the vibration generating mechanism 200, the vibration generating mechanism 200 tends to move downward, thereby driving the outer shell 3 to generate axial vibration under the pulsed pressure of the drilling fluid, and then transmitting the vibration to the drill bit connected below the outer shell 3.

[0036] The frequency adjustment mechanism 300 is located above the vibration generating mechanism 200, and an oscillation cavity 400 is formed between the frequency adjustment mechanism 300 and the first pressure surface 201 of the vibration generating mechanism 200, which is used to respond to drilling fluid pressure. By adjusting the distance between the frequency adjustment mechanism 300 and the vibration generating mechanism 200, the size of the oscillation cavity 400 can be adjusted, thereby changing the frequency of the pressure pulses generated by the fluid passing through the oscillation cavity 400 and thereby adjusting the vibration frequency.

[0037] In the process of using the present invention, by adjusting the distance between the frequency adjustment mechanism 300 and the vibration generating mechanism 200 and changing the size of the oscillation cavity 400, the vibration frequency generated by the frequency adjustment mechanism 300 is made as close as possible to the natural frequency of the formation rock, thereby achieving the purpose of improving rock breaking efficiency.

[0038] In a specific embodiment, the frequency adjustment mechanism 300 includes an upper oscillating member 5, which includes a large-diameter portion 51 and a small-diameter portion 52. The inner diameter of the large-diameter portion 51 is larger than that of the small-diameter portion 52. An oscillation cavity 400 is defined between the lower end surface of the small-diameter portion 52 and the first pressure surface 201. When the upper oscillating member 5 moves axially relative to the first pressure surface 201, the size of the oscillation cavity 400 can be adjusted, thereby changing the vibration frequency generated by the resonance-assisted rock breaking tool 100.

[0039] Furthermore, the large diameter portion 51 overlaps with the vibration generating mechanism 200 in a partial length direction, and a first sealing member 6 is provided at the overlapping position of the large diameter portion 51 and the vibration generating mechanism 200. Figure 1 As shown, the outer wall of the large-diameter portion 51 contacts the inner wall of the housing 3, an annulus exists between the upper end of the vibration-generating mechanism 200 and the housing 3, and the lower portion of the large-diameter portion 51 extends into the annulus between the upper end of the vibration-generating mechanism 200 and the housing 3. A first sealing member 6 is provided between the lower inner wall of the large-diameter portion 51 and the upper outer wall of the vibration-generating mechanism 200. This arrangement ensures the sealing of the oscillation cavity 400, and the space of the oscillation cavity 400 is controlled between the upper oscillating member 5 and the first pressure surface 201. This allows the size of the oscillation cavity 400 to be strictly controlled, and thus the vibration frequency generated by the resonance-assisted rock breaking tool 100 to be precisely controlled.

[0040] In this embodiment, the first sealing member 6 is an O-ring.

[0041] According to the present invention, in a specific embodiment, the upper oscillating member 5 is connected to the housing 3 via a thread, and the size of the oscillating cavity 400 can be adjusted by rotating the upper oscillating member 5 relative to the housing 3. Figure 1 As shown, an upper joint 1 is provided at the upper end of the housing 3. The upper joint 1 is coaxially fixed to the housing 3 via a threaded connection, and the inner diameter of the upper joint 1 is smaller than the inner diameter of the housing 3. A rotating adjustment cylinder 2 is coaxially fixed to the upper portion of the upper oscillating member 5. In this embodiment, the inner diameter of the rotating adjustment cylinder 2 is smaller than the inner diameter of the small-diameter portion 52. The rotating adjustment cylinder 2 is sleeved on the outer side of the upper end of the small-diameter portion 52. A plurality of fastening screws 4 are evenly arranged along the circumference of the rotating adjustment cylinder 2 and the small-diameter portion 52. The rotating adjustment cylinder 2 is connected to the upper joint 1 via threads, i.e., an external thread is provided on the outer wall of the rotating adjustment cylinder 2, and an internal thread is provided on the inner wall of the upper joint 1.

[0042] According to the present invention, in a specific embodiment, the vibration generating mechanism 200 includes a piston assembly 203. The upper end surface of the piston assembly 203 is a first pressure surface 201, and the lower end surface of the piston assembly 203 is a second pressure surface 202. The axial projection area of ​​the first pressure surface 201 is larger than that of the second pressure surface 202. When drilling fluid flows through the vibration generating mechanism 200, the drilling fluid exerts a downward pulse pressure on the piston assembly 203 under the pulse pressure of the drilling fluid, thereby causing the resonance-assisted rock breaking tool 100 to generate axial vibration.

[0043] In a preferred embodiment, at least one set of piston blocks 10 and pressure blocks 204 are disposed within the annulus between the piston assembly 203 and the housing 3. The radial inner and outer sides of the piston block 10 and the pressure block 204 are sealed against the piston assembly 203 and the housing 3, respectively. The piston block 10 is fixed to the housing 3, and the piston block 10 is fixed to the piston assembly 203. A first pressure transmission hole 205 is provided on the piston assembly 203 corresponding to the piston block 10 and the pressure block 204. Under this arrangement, the drilling fluid pressure can be transmitted between the piston block 10 and the pressure block 204 through the first pressure transmission hole 205. The pulse pressure of the drilling fluid will apply an upward force to the housing 3 through the piston block 10. At the same time, the pulse pressure of the drilling fluid will apply a downward force to the piston assembly 203 through the pressure block 204, thereby increasing the tendency of the piston assembly 203 to move downward relative to the housing 3 and increasing the impact force.

[0044] like Figure 1 and Figure 2 As shown, a second pressure transmission hole 31 is provided at a position of the housing 3 corresponding to the piston block 10 , and a third pressure transmission hole 101 is provided in the piston block 10 to connect the second pressure transmission hole 31 with the upper end of the piston block 10 .

[0045] like Figure 2 and Figure 3 As shown, the piston block 10 is constructed as a whole in an annular shape, with multiple third pressure-transmitting holes 101 evenly arranged along the circumference of the piston block 10. The third pressure-transmitting holes 101 include interconnected axial holes and radial holes, with one end of the axial hole located on the upper end surface of the piston block 10 and the other end located inside the piston block 10. One end of the radial hole is located on the outer side of the piston block 10 and communicates with the second pressure-transmitting hole 31, while the other end of the radial hole is located inside the piston block 10 and communicates with the end of the axial hole located inside the piston block 10.

[0046] Furthermore, multiple groups of piston blocks 10 and pressure blocks 204 are arranged in the annulus between the piston assembly 203 and the housing 3, forming multi-stage piston pressurization, which generates a stronger impact force after superposition, thereby being more conducive to rock breaking.

[0047] In a specific embodiment, the piston assembly 203 includes a lower oscillating member 7, an upper piston 12, and a lower piston 15 that are fixedly connected in sequence from top to bottom.

[0048] Among them, the outer diameter of the lower oscillating member 7 is larger than the outer diameter of the upper piston 12, and the lower part of the lower oscillating member 7 is fixedly connected to the outer side of the upper part of the upper piston 12 by a threaded connection. A second sealing member 8 is provided between the inner wall of the lower oscillating member 7 and the outer wall of the upper piston 12, and a third sealing member 9 is provided between the outer wall of the lower oscillating member 7 and the inner wall of the outer casing 3.

[0049] In this embodiment, the second sealing member 8 is an O-ring, and the third sealing member 9 is a Gly ring.

[0050] The outer diameter of the lower piston 15 is greater than that of the upper piston 12 . The upper portion of the lower piston 15 is fixedly connected to the outer side of the lower portion of the upper piston 12 by a threaded connection. A seal is provided between the outer wall of the lower piston 15 and the housing 3 .

[0051] Two piston blocks 10 are arranged in the annulus between the upper piston 12 and the housing 3 , namely a first piston block 102 located at the top and a second piston block 103 located at the bottom.

[0052] The first piston block 102 is fixedly connected to the housing 3 via a fixing screw 14. The upper end of the first piston block 102 is in axial contact with the lower oscillating member 7. In other words, the lower end of the lower oscillating member 7 acts as a pressure block compatible with the first piston block 102. When the piston assembly 203 is subjected to the pulse pressure of the drilling fluid and tends to move downward, the piston assembly 203 can transmit a downward force to the first piston block 102 through the lower oscillating member 7, thereby causing the housing 3 to drive the drill bit connected below to generate axial vibration.

[0053] A pressure block 204 is disposed between the first piston block 102 and the second piston block 103. In this embodiment, the pressure block 204 is integral with the upper piston 12. The second piston block 103 is fixedly connected to the housing 3 via a set screw 14, with the upper end of the second piston block 103 in axial contact with the lower end of the pressure block 204. When the piston assembly 203 is subjected to the pulse pressure of the drilling fluid and tends to move downward, the piston assembly 203 transmits a downward force to the second piston block 103 through the pressure block 204, thereby causing the housing 3 to drive the drill bit connected below to generate axial vibration.

[0054] A seal is provided between the upper end of the lower piston 15 and the outer shell 3. The lower outer diameter of the lower piston 15 is smaller than the inner diameter of the outer shell 3. A third piston block 104 is provided in the annulus between the lower piston 15 and the outer shell 3. The third piston block 104 is fixedly connected to the outer shell 3 via a fixing screw 14. The upper end surface of the third piston block 104 is in axial contact with the lower piston 15. In other words, the upper end of the lower piston 15 acts as a pressure block compatible with the third piston block 104. When the piston assembly 203 is subjected to the pulse pressure of the drilling fluid and tends to move downward, the piston assembly 203 can transmit a downward force to the third piston block 104 through the lower piston 15, thereby enabling the outer shell 3 to drive the drill bit connected below to generate axial vibration.

[0055] First pressure-transmitting holes 205 are provided on the sidewalls of the piston assemblies 203 below the first, second, and third piston blocks 102, 103, and 104. Specifically, radial first pressure-transmitting holes 205 are provided on the sidewalls of the upper piston 12 between the first piston block 102 and the pressure block 204, and between the second piston block 103 and the lower piston 15. A radial first pressure-transmitting hole 205 is provided on the sidewall of the lower piston 15 between the third piston block 104 and the torque-transmitting shaft 16.

[0056] The drilling fluid pressure can be transmitted to between the first piston block 102 and the pressure block 204, between the second piston block 103 and the lower piston 15, and between the third piston block 104 and the torque transmission shaft 16 through the above-mentioned three first pressure transmission holes 205. Under this setting, the downward impact force of the piston assembly 203 relative to the outer shell 3 can be increased, thereby improving the rock breaking effect.

[0057] It is easy to understand that although three piston blocks 10 are provided in this embodiment, this is only one embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Those skilled in the art can increase the number of piston blocks 10 based on the present invention. For example, one or more lower pistons 15 can be connected below the lower piston 15, and the piston blocks 10 can be provided between the lower piston 15 and the housing 3.

[0058] According to the present invention, in a specific embodiment, the torque transmission shaft 16 is fixedly disposed within the housing 3 via a torque transmission connection. The lower piston 15 is in axial contact with the torque transmission shaft 16. A lower connector 17 is threadedly disposed at the lower end of the torque transmission shaft 16. The lower connector 17 is connected to the lower drilling tool via a drill pipe thread. In a specific embodiment, the torque transmission shaft 16 is connected to the housing 3 via a threaded connection.

[0059] According to the present invention, during the drilling process using the present invention, a tooling or electric rotating device is used to rotate the rotating adjustment cylinder 2 inside the upper joint 1 to adjust the relative position of the upper joint 1 and the rotating adjustment cylinder 2, so that the relative position of the upper oscillating member 5 and the lower oscillating member 7 and the structural dimensions of the oscillation cavity 400 formed by the two are changed, thereby changing the frequency of the pressure pulses generated by the fluid passing through the self-excited oscillation cavity.

[0060] like Figure 2 As shown, the upper end face of the piston block 10 is connected to the outside of the tool through the third pressure transmission hole 101 and the second pressure transmission hole 22 of the shell 3, and the first pressure transmission hole 205 on the upper piston 12 is connected to the lower part of the piston block 10, so that the upper and lower ends of the piston block 10 are respectively connected to the inside and outside of the tool. When the fluid passes through the inside of the tool to generate a pressure pulse in the oscillation cavity 400 formed by the upper oscillating member 5 and the lower oscillating member 7, the internal pressure of the tool is higher than the external pressure, thereby forming a superimposed and amplified downward force on the piston end faces of the piston block 10 and the upper piston 12 and the lower piston 15, and the force is transmitted to the lower drilling tool or drill bit through the torque transmission shaft 16 and the lower joint 17.

[0061] The pressure curves generated by the oscillation cavities 400 of different sizes are as follows: Figure 4 and Figure 5 When the distance L between the upper oscillating member 5 and the lower oscillating member 7 is 70 mm, the frequency of the generated oscillating pressure is 434 Hz. When the distance L between the upper oscillating member 5 and the lower oscillating member 7 is 80 mm, the frequency of the generated oscillating pressure is 384 Hz.

[0062] When the frequency of the downward impact force generated by the oscillating pressure is close to the resonance frequency of the rock, it can cause violent resonance damage to the rock, thereby reducing the difficulty of the drill bit in breaking the rock and increasing the mechanical drilling speed.

[0063] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0064] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0065] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0066] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A resonance-assisted rock breaking tool, characterized in that: include: Housing (3); a vibration generating mechanism (200) disposed within the housing (3), the vibration generating mechanism (200) being configured to respond to pressure changes of drilling fluid, thereby generating vibration; as well as A frequency adjustment mechanism (300) is arranged in the housing (3), and an oscillation cavity (400) is formed between the frequency adjustment mechanism (300) and a first pressure surface (201) of the vibration generating mechanism (200) for responding to drilling fluid pressure. By adjusting the distance between the frequency adjustment mechanism (300) and the vibration generating mechanism (200), the size of the oscillation cavity (400) can be adjusted, thereby adjusting the vibration frequency.

2. The resonance-assisted rock breaking tool according to claim 1, characterized in that: The frequency adjustment mechanism (300) includes an upper oscillating member (5), the upper oscillating member (5) including a large-diameter portion (51) and a small-diameter portion (52), the inner diameter of the large-diameter portion (51) is larger than the inner diameter of the small-diameter portion (52), and the oscillation cavity (400) is located between the lower end surface of the small-diameter portion (52) and the first pressure surface (201).

3. The resonance-assisted rock breaking tool according to claim 2, characterized in that: The large diameter portion (51) and the vibration generating mechanism (200) overlap in a partial length direction, and a first sealing member (6) is provided at the overlapping position of the large diameter portion (51) and the vibration generating mechanism (200).

4. The resonance-assisted rock breaking tool according to claim 3, characterized in that: The upper oscillating member (5) is connected to the housing (3) via a thread, and the size of the oscillating cavity (400) can be adjusted by rotating the upper oscillating member (5) relative to the housing (3).

5. The resonance-assisted rock breaking tool according to claim 4, characterized in that: An upper joint (1) is provided at the upper end of the housing (3), a rotation adjustment cylinder (2) is fixedly provided on the upper part of the upper oscillating member (5), the rotation adjustment cylinder (2) is connected to the upper joint (1) via a thread, and the rotation adjustment cylinder (2) is connected to the upper oscillating member (5) via a fastening screw (4).

6. The resonance-assisted rock breaking tool according to any one of claims 1 to 5, characterized in that: The vibration generating mechanism (200) includes a piston assembly (203), the upper end surface of the piston assembly (203) is a first pressure surface (201), the lower end surface of the piston assembly (203) is a second pressure surface (202), and the axial projection area of ​​the first pressure surface (201) is larger than that of the second pressure surface (202).

7. The resonance-assisted rock breaking tool according to claim 6, characterized in that: At least one group of piston blocks (10) and pressure blocks (204) are arranged in the annulus between the piston assembly (203) and the outer shell (3), and the radial inner and outer sides of the piston block (10) and the pressure block (204) are sealed with the piston assembly (203) and the outer shell (3) respectively, wherein the piston block (10) is fixed to the outer shell (3), and the piston block (10) is fixed to the piston assembly (203), and a first pressure transmission hole (205) is provided on the corresponding piston assembly (203) below the piston block (10).

8. The resonance-assisted rock breaking tool according to claim 7, characterized in that: A second pressure transmission hole (31) is provided at a position of the housing (3) corresponding to the piston block (10), and a third pressure transmission hole (101) is provided in the piston block (10) for connecting the second pressure transmission hole (31) with the upper end of the piston block (10).

9. The resonance-assisted rock breaking tool according to claim 6, characterized in that: The piston assembly (203) comprises a lower oscillating member (7), an upper piston (12) and a lower piston (15) which are fixedly connected in sequence from top to bottom. The lower oscillating member (7) and the lower piston (15) are both sealed with the housing (3).

10. The resonance-assisted rock breaking tool according to claim 9, characterized in that: A torque transmission shaft (16) is fixedly arranged in the housing (3) by a torque transmission connection, a lower joint (17) is arranged at the lower end of the torque transmission shaft (16), and the lower piston (15) is in contact with the torque transmission shaft (16).

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