Drilling tool

Abstract

The invention discloses a drilling tool which comprises a first cavity, a second cavity, a high-pressure fluid jet excitation assembly arranged in the first cavity and an electromagnetic excitation assembly arranged in the second cavity. The electromagnetic excitation assembly comprises an impact block, a permanent magnet, a magnetic modulator and a locking part used for locking the impact block and the second cavity, the impact block is movably arranged in the second cavity, the permanent magnet and the magnetic modulator fill the two ends of the second cavity respectively, and the permanent magnet and the magnetic modulator are arranged at the two ends of the impact block in the moving direction respectively. The drilling tool can adjust the operation states of the high-pressure fluid jet excitation assembly and the electromagnetic excitation assembly according to different requirements of application scenes, only the high-pressure fluid jet excitation assembly can be started when the requirement for the impact frequency of a downhole tool is low, and only the high-pressure fluid jet excitation assembly can be started when the requirement for the impact frequency of the downhole tool is high. The high-pressure fluid jet shock excitation assembly and the electromagnetic excitation assembly can be started at the same time, and the problems that the drilling efficiency of a site difficult-to-drill stratum is poor and an existing ultrahigh-frequency downhole tool is single in application scene are solved.

Description

Technical Field

[0001] This application relates to the technical field of downhole operations, and particularly to a drilling tool. Background Art

[0002] At present, according to different implementation methods of ultra-high-frequency excitation force, downhole high-frequency impact drilling tools are divided into high-pressure fluid jet excitation tools and downhole electromagnetic excitation tools.

[0003] High-pressure fluid jet excitation tools convert the pressure potential energy of high-pressure drilling fluid into high-frequency impact energy through a mechanical structure, and can form a reliable, continuous, and stable high-frequency impact force output. However, the impact force frequency is not too high, generally below 1 kHz. Downhole electromagnetic excitation tools convert electrical energy into mechanical energy through downhole permanent magnet coils, cables, piezoelectric ceramics, etc., and can achieve high-frequency impacts of 10 kHz. The above two types of downhole tools are respectively applicable to different occasions. Therefore, whether it is a high-pressure fluid jet excitation tool or a downhole electromagnetic excitation tool, their application scenarios are single and their functions are relatively limited. Summary of the Invention

[0004] The purpose of this application is to provide a drilling tool that can adjust the working mode according to the application scenario, so as to provide high-frequency impacts of different frequencies based on different operating principles and meet the operating requirements under different application scenarios.

[0005] To achieve the above purpose, this application provides a drilling tool, which includes a first cavity, a second cavity, a high-pressure fluid jet excitation assembly disposed in the first cavity, and an electromagnetic excitation assembly disposed in the second cavity; the electromagnetic excitation assembly includes an impact block, a permanent magnet, a magnetic modulator, and a locking portion for locking the impact block and the second cavity. The impact block is movably installed in the second cavity, the permanent magnet and the magnetic modulator respectively fill both ends of the second cavity, and the permanent magnet and the magnetic modulator are respectively disposed at both ends of the moving direction of the impact block.

[0006] In some embodiments, it further includes a first cylinder body and a second cylinder body sleeved on the first cylinder body; the first cavity is disposed in the first cylinder body, and the second cavity is disposed between the first cylinder body and the second cylinder body; both axial ends of the first cylinder body are provided with joint cavities for connecting a drill pipe and a drill bit respectively, and the first cavity communicates with the two joint cavities.

[0007] In some embodiments, a plurality of second cavities are provided in the second cylinder body, and all the second cavities are annularly distributed; the electromagnetic excitation assembly includes an annular magnetic modulator and a plurality of impact blocks; all the impact blocks are correspondingly arranged in all the second cavities, and all the impact blocks are correspondingly distributed with the magnetic modulator.

[0008] In some embodiments, the electromagnetic excitation assembly further includes a plurality of wedge-shaped limit blocks, and all the wedge-shaped limit blocks are respectively arranged in all the second cavities one by one; the impact block moves between the first end and the second end of the second cavity, the thickness of the wedge-shaped limit block gradually increases from the first end to the second end of the second cavity, and one side surface of the impact block is in sliding fit with the wedge surface of the wedge-shaped limit block; the locking portion includes a fastener, and the fastener is used to penetrate into and press the impact block from the second cylinder body and the second end of the wedge-shaped limit block.

[0009] In some embodiments, any one of the wedge-shaped limit blocks is close to the outside of the corresponding second cavity; the first cylinder body is adjacent to the inside of all the second cavities.

[0010] In some embodiments, the electromagnetic excitation assembly further includes a buffer; the magnetic modulator includes a working surface facing the second cavity, and the buffer covers the working surface.

[0011] In some embodiments, the buffer is specifically a buffer disc spring.

[0012] In some embodiments, the high-pressure fluid jet excitation assembly includes a hydraulic high-frequency generator and a stroke control rod; the two joint cavities include a first joint cavity for connecting the drill pipe and a second joint cavity for connecting the drill bit, the hydraulic high-frequency generator is arranged between the first joint cavity and the first cavity, and the stroke control rod is distributed along the central axis of the first cavity.

[0013] In some embodiments, both the first joint cavity and the second joint cavity are provided as female-threaded cavities.

[0014] In some embodiments, the high-pressure fluid jet excitation assembly further includes a bushing; the bushing wraps the stroke control rod.

[0015] Compared with the above background art, the drilling tool provided by the present application includes a first cavity, a second cavity, a high-pressure fluid jet excitation assembly arranged in the first cavity, and an electromagnetic excitation assembly arranged in the second cavity; the electromagnetic excitation assembly includes an impact block, a permanent magnet, a magnetic modulator, and a locking portion for locking the impact block and the second cavity, the impact block is movably installed in the second cavity, the permanent magnet and the magnetic modulator respectively fill both ends of the second cavity, and the permanent magnet and the magnetic modulator are respectively arranged at both ends in the moving direction of the impact block.

[0016] The drilling tool provided by this application can provide different impact frequencies for downhole operations according to different operation scenarios: when the impact frequency requirement for the downhole tool is relatively low, only the high-pressure fluid jet excitation component in the first cavity can be activated, and only rely on the high-pressure impact of the drilling fluid to drive the impact system in the drilling tool to reciprocate axially, so as to provide a high-frequency shock wave output below 1 kHz to the drill bit; when the impact frequency requirement for the downhole tool is relatively high, the high-pressure fluid jet excitation component in the first cavity and the electromagnetic excitation component in the second cavity can be activated at the same time, and a super-high-frequency shock wave output of 5 kHz to 10 kHz can be provided to the drill bit through a combination of electromagnetic excitation and high-pressure fluid impact methods.

[0017] In summary, the drilling tool provided by this application can adjust the operating states of the high-pressure fluid jet excitation component and the electromagnetic excitation component according to different requirements of the application scenario, thereby changing the working mode of the drilling tool and generating shock wave outputs of different frequencies externally, solving the problems of poor drilling efficiency in difficult-to-drill formations on site and the single application scenario of existing super-high-frequency downhole tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0019] Figure 1 It is a schematic structural diagram of the drilling tool provided by the embodiment of this application.

[0020] Wherein, 1 - first cavity, 2 - second cavity, 3 - high-pressure fluid jet excitation component, 31 - hydraulic high-frequency generator, 32 - amplitude-changing control rod, 33 - bushing, 4 - electromagnetic excitation component, 41 - impact block, 42 - permanent magnet, 43 - magnetic modulator, 44 - wedge-shaped limit block, 45 - fastener, 46 - buffer, 5 - first cylinder, 61 - first joint cavity, 62 - second joint cavity, 7 - second cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0022] To enable those skilled in the art of this technical field to better understand the solution of this application, the following further detailed description of this application will be given in conjunction with the accompanying drawings and specific embodiments.

[0023] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the drilling tool provided by the embodiment of this application.

[0024] This application provides a drilling tool, which includes a first cavity 1, a second cavity 2, a high-pressure fluid jet excitation assembly 3 and an electromagnetic excitation assembly 4; wherein, the electromagnetic excitation assembly 4 includes an impact block 41, a permanent magnet 42, a magnetic modulator 43 and a locking part. The impact block 41 is movably installed in the second cavity 2. The permanent magnet 42 and the magnetic modulator 43 respectively fill both ends of the second cavity 2. The permanent magnet 42 and the magnetic modulator 43 are respectively arranged at both ends of the moving direction of the impact block 41. The locking part is arranged between the impact block 41 and the second cavity 2 and can lock and unlock the impact block 41.

[0025] This drilling tool is provided with a high-pressure fluid jet excitation assembly 3 and an electromagnetic excitation assembly 4, and uses the high-pressure fluid jet excitation assembly 3 and the electromagnetic excitation assembly 4 to make the drill bit of the drilling tool generate high-frequency impacts. In this embodiment, the high-pressure fluid jet excitation assembly 3 can operate independently, that is, the high-pressure fluid jet excitation assembly 3 relies on the high-pressure impact of the drilling fluid to provide high-frequency shock wave output outward; the high-pressure fluid jet excitation assembly 3 can also operate jointly with the electromagnetic excitation assembly 4, that is, the high-pressure fluid jet excitation assembly 3 and the electromagnetic excitation assembly 4 cooperate to operate. The high-pressure fluid jet excitation assembly 3 relies on the high-pressure impact of the drilling fluid to provide high-frequency shock wave output outward, and the impact block 41 of the electromagnetic excitation assembly 4 provides high-frequency shock wave output outward under the magnetic field operation.

[0026] When using the drilling tool provided by this application, if it is necessary to use the high-pressure fluid jet excitation assembly 3 alone, the impact block 41 can be locked through a locking member, and at the same time, only the high-pressure fluid jet excitation assembly 3 is turned on; if it is necessary to use both the high-pressure fluid jet excitation assembly 3 and the electromagnetic excitation assembly 4 at the same time, the locking member can be used to unlock the impact block 41, and then the high-pressure fluid jet excitation assembly 3 and the electromagnetic excitation assembly 4 are turned on, and the movement characteristics of the impact block 41 are adjusted through the magnetic modulator 43, so that the high-pressure fluid jet excitation assembly 3 and the electromagnetic excitation assembly 4 cooperate to operate and provide ultra-high-frequency shock wave output outward.

[0027] In summary, the drilling tool provided by the present application can provide different impact frequencies for downhole operations according to different operation scenarios. When the requirement for the impact frequency of the downhole tool is relatively low, only the high-pressure fluid jet excitation assembly 3 can be activated, and only rely on the high-pressure impact of the drilling fluid to drive the axial reciprocating movement of the impact system in the drilling tool. Through the mechanical structure, a high-frequency shock wave output below 1 kHz can be provided. When the requirement for the impact frequency of the downhole tool is relatively high, both the high-pressure fluid jet excitation assembly 3 and the electromagnetic excitation assembly 4 can be activated. Through the combined method of electromagnetic excitation and high-pressure fluid impact, a super-high-frequency shock wave output of 5 kHz to 10 kHz can be provided.

[0028] In summary, the drilling tool provided by the present application can adjust the operating states of the high-pressure fluid jet excitation assembly 3 and the electromagnetic excitation assembly 4 according to different requirements of the application scenarios, thereby changing the working mode of the drilling tool and generating shock wave outputs of different frequencies externally.

[0029] The following further describes the drilling tool provided by the present application in conjunction with the accompanying drawings and embodiments.

[0030] In some embodiments, the drilling tool provided by the present application further includes a first cylinder 5 and a second cylinder 7; the second cylinder 7 is sleeved on the first cylinder 5, and the first cylinder 5 and the second cylinder 7 can be coaxially distributed; the high-pressure fluid jet excitation assembly 3 is arranged in the first cylinder 5, the electromagnetic excitation assembly 4 is arranged between the second cylinder 7 and the first cylinder 5, and the locking part can be installed on the impact block 41 and the second cylinder 7 to lock the impact block 41 and the second cylinder 7.

[0031] In the above embodiment, the first cylinder 5 is provided with a first cavity 1, and two joint cavities are provided at both axial ends of the first cylinder 5. The first cavity 1 and the two joint cavities communicate with each other; a second cavity 2 is provided between the first cylinder 5 and the second cylinder 7. The second cavity 2 is located between the outer cylinder wall of the first cylinder 5 and the inner cylinder wall of the second cylinder 7, and the permanent magnet 42 and the magnetic modulator 43 respectively fill both ends of the second cavity 2.

[0032] In the above embodiment, the first cavity 1 is arranged in the first cylinder 5 for high-pressure fluid to flow through. The two joint cavities are respectively arranged at both axial ends of the first cylinder 5 and can be used to connect the drill pipe and the drill bit, and at the same time satisfy the flow of high-pressure fluid in the drill pipe, the drill bit and the first cylinder 5, so that the high-pressure fluid jet excitation assembly 3 generates a high-frequency impact on the drill bit; the second cavity 2 is arranged between the first cylinder 5 and the second cylinder 7 for the impact block 41 to reciprocate. The permanent magnet 42 and the magnetic modulator 43 respectively fill both ends of the second cavity 2 and can drive the impact block 41 to reciprocate, so that the electromagnetic excitation assembly 4 generates a high-frequency impact on the drill bit.

[0033] In some embodiments, a plurality of second cavities 2 are provided in the second cylinder body 7. The electromagnetic excitation assembly 4 includes a magnetic modulator 43 and a plurality of impact blocks 41. The magnetic modulator 43 is annular, and all the impact blocks 41 are correspondingly arranged in all the second cavities 2 one by one, and all the impact blocks 41 are correspondingly distributed with the aforementioned magnetic modulator 43. The magnetic modulator 43 can be specifically set as an ultra-high frequency modulator, which is distributed with each permanent magnet 42 on two opposite sides of each impact block 41, so that the impact block 41 can reciprocate in the magnetic field generated by the ultra-high frequency modulator and the permanent magnet 42. When using the electromagnetic excitation assembly 4, the impact blocks 41 in each second cavity 2 can be made to move cooperatively through the ultra-high frequency modulator, while ensuring the cooperative operation of the electromagnetic excitation assembly 4 and the high-pressure fluid jet excitation assembly 3.

[0034] On the basis of the above embodiments, the electromagnetic excitation assembly 4 further includes a plurality of wedge-shaped limit blocks 44. All the wedge-shaped limit blocks 44 are correspondingly arranged in all the second cavities 2 one by one, and any one of the wedge-shaped limit blocks 44 is located between the outer cylindrical wall of the first cylinder body 5 and the inner cylindrical wall of the corresponding second cylinder body 7. In this embodiment, for any one of the second cavities 2 and the impact block 41 and the wedge-shaped limit block 44 therein, the impact block 41 moves between the first end and the second end of the second cavity 2. The wedge-shaped limit block 44 is arranged on one side of the second cavity 2, and the thickness of the wedge-shaped limit block 44 gradually increases from the first end to the second end of the second cavity 2. One side surface of the aforementioned impact block 41 is in sliding fit with the wedge surface of the wedge-shaped limit block 44, and the permanent magnet 42 and the magnetic modulator 43 can drive the impact block 41 to slide along the wedge surface of the wedge-shaped limit block 44, so that the impact block 41 reciprocates between the first end and the second end of the second cavity 2.

[0035] In the above embodiments, the locking part may include a fastener 45. The fastener 45 passes through the second cylinder body 7 and the second end of the wedge-shaped limit block 44 for squeezing and positioning the impact block 41 to realize the relative fixation of the second cylinder body 7, the wedge-shaped limit block 44 and the impact block 41. Of course, when the electromagnetic excitation assembly 4 needs to be used, the fastener 45 can be disassembled to release the constraint of the fastener 45 on the impact block 41. For example, the fastener 45 can be pulled out of the second cylinder body 7 so that the inner end of the fastener 45 is separated from the impact block 41. At this time, the fastener 45 can still be in the second cylinder body 7 and the wedge-shaped limit block 44.

[0036] In the above embodiments, the wedge-shaped limit block 44 and the first cylinder body 5 are respectively arranged on two sides of the second cavity 2. For example, the first cylinder body 5 is adjacent to the inner side of all the second cavities 2, and any one of the wedge-shaped limit blocks 44 is close to the outer side of the corresponding second cavity 2.

[0037] In addition, in the above embodiments, the electromagnetic excitation assembly 4 further includes a buffer 46. The magnetic modulator 43 includes a working surface facing the second cavity 2, and the buffer 46 covers the working surface. For reference Figure 1, the working surface of the magnetic modulator 43 faces downward. In other words, the bottom surface of the magnetic modulator 43 is the working surface of the magnetic modulator 43, and the buffer member 46 covers the bottom surface of the magnetic modulator 43.

[0038] Generally, the buffer member 46 can be specifically set as a buffer disc spring. The buffer disc spring can protect the drill string above the drilling tool from the influence of ultra-high frequency impact.

[0039] In some embodiments, the high-pressure fluid jet excitation assembly 3 may include a hydraulic high-frequency generator 31 and a stroke control rod 32. At the same time, the two joint cavities include a first joint cavity 61 and a second joint cavity 62. The first joint cavity 61 and the second joint cavity 62 are used to connect the drill pipe and the drill bit respectively. For example, the first joint cavity 61 is used to connect the cavity of the drill pipe, and the second joint cavity 62 is used to connect the cavity of the drill bit. In this embodiment, the hydraulic high-frequency generator 31 is arranged between the first joint cavity 61 and the first cavity 1, and the stroke control rod 32 is distributed along the central axis of the first cavity 1. The high-pressure fluid can flow from the cavity of the drill pipe through the first joint cavity 61 into the first cavity 1, and then flow out from the second joint cavity 62 and flow to the cavity of the drill bit.

[0040] In the above embodiment, the hydraulic high-frequency generator 31 can convert the pressure potential energy of the high-pressure drilling fluid into mechanical energy of up-and-down vibration, thereby driving the stroke control rod 32 to vibrate up and down, and finally driving the drill bit to vibrate up and down to generate high-frequency vibration. As the pressure of the drilling fluid gradually increases, the high-frequency vibration frequency generated by the drill bit will also gradually increase, and the maximum can reach 1 kHz.

[0041] In the above embodiment, the first joint cavity 61 and the second joint cavity 62 can be specifically set as female thread cavities, which is convenient for connecting the drill pipe and the drill bit; wherein, female threads are respectively provided at both axial ends of the first cylinder 5, and the female thread cavity is arranged inside the female thread.

[0042] In the above embodiment, the high-pressure fluid jet excitation assembly 3 further includes a bushing 33; the bushing 33 wraps the stroke control rod 32, which can protect the stroke control rod 32 from the impact of high-pressure fluid, and at the same time can also reduce the friction generated by the up-and-down vibration of the stroke control rod 32.

[0043] The drilling tool provided by the present application has two working modes: high-frequency working mode and ultra-high-frequency working mode. When the drilling tool is in the high-frequency working mode, it only relies on the high-pressure impact of the drilling fluid to drive the axial reciprocating movement of the internal impact system therein, and realizes the output of high-frequency shock waves with a maximum of 1 kHz only by the mechanical structure. When the drilling tool is in the ultra-high-frequency working mode, it can output ultra-high-frequency shock waves with a maximum of 10 kHz through a combination of electromagnetic excitation and high-pressure fluid impact.

[0044] When using the high-frequency working mode of the drilling tool provided by the present application, it can be operated according to the following steps:

[0045] (1) Before leaving the factory, conduct flaw detection tests and pressure-bearing tests on the drilling tool.

[0046] (2) Check the drilling tool before on-site use. For example, it is possible to detect whether the fastener 45 of the drilling tool is tightened; it is possible to check whether there are foreign objects in the female thread cavities at both ends of the drilling tool; it is possible to check whether the first cavity 1 of the drilling tool is unobstructed.

[0047] (3) Connect the drill pipe and the drill bit to the drilling tool according to the on-site working conditions.

[0048] (4) Before lowering into the well, start the pump for a shallow test at the wellhead and measure the pressure loss of the above assembly.

[0049] (5) After the above assembly is lowered into the well, turn on the high-pressure fluid jet excitation assembly 3 and follow up the relevant drilling parameters in real time, and judge the operating state of the aforementioned assembly according to parameters such as pump pressure, torque, drilling speed, and rotational speed.

[0050] After the above assembly is lifted out of the well, promptly clean the foreign objects in the first cavity 1 of the tool, and transport the aforementioned assembly back to the maintenance workshop, and check each component of the aforementioned assembly in the workshop.

[0051] When using the ultra-high frequency working mode of the drilling tool provided by the present application, the following steps can be followed for operation:

[0052] (1) Before leaving the factory, conduct flaw detection tests and pressure-bearing tests on the drilling tool.

[0053] (2) Check the drilling tool before on-site use. For example, it is possible to check whether there are foreign objects in the female thread cavities at both ends of the drilling tool; it is possible to check whether the first cavity 1 of the drilling tool is unobstructed.

[0054] (3) Connect the drill pipe and the drill bit to the drilling tool according to the on-site working conditions.

[0055] (4) Loosen the fastener 45 of the drilling tool to release the impact block 41.

[0056] (5) Adjust the ultra-high frequency modulator so that the impact block 41 of the electromagnetic excitation assembly 4 and the high-pressure fluid jet excitation assembly 3 move in coordination.

[0057] (6) Before lowering into the well, start the pump for a shallow test at the wellhead and measure the pressure loss of the above assembly.

[0058] (7) After the above assembly is lowered into the well, follow up the relevant drilling parameters in real time, and judge the tool operating state according to parameters such as pump pressure, torque, drilling speed, and rotational speed.

[0059] (8) After the above assembly is lifted out of the well, tighten the fastener 45 to lock the impact block 41.

[0060] (9) Timely clean the foreign matters in the first cavity 1 of the above-mentioned assembly, and transport the aforesaid assembly back to the maintenance workshop to inspect each component of the aforesaid assembly in the workshop.

[0061] The drilling tool provided by the present application can select the working mode, placement position, usage precautions, etc. of the drilling tool according to different downhole working conditions. When processing and using the drilling tool provided by the present application, it should be strictly in accordance with this method to ultimately achieve the purpose of more standardized and efficient use of the drilling tool.

[0062] In summary, the drilling tool provided by the present application can select the working mode in real time according to the on-site situation, can effectively solve the problems such as poor drilling efficiency in difficult-to-drill formations on site and single application scenarios of existing ultra-high frequency downhole tools, improve the mechanical drilling rate, and reduce the occurrence of downhole complex situations.

[0063] The above has introduced the drilling tool provided by the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A drilling tool, characterized in that, It includes a first cavity (1), a second cavity (2), a high-pressure fluid jet excitation assembly (3) disposed in the first cavity (1), and an electromagnetic excitation assembly (4) disposed in the second cavity (2); the electromagnetic excitation assembly (4) includes an impact block (41), a permanent magnet (42), a magnetic modulator (43), and a locking portion for locking the impact block (41) and the second cavity (2). The impact block (41) is movably installed in the second cavity (2). The permanent magnet (42) and the magnetic modulator (43) respectively fill both ends of the second cavity (2), and the permanent magnet (42) and the magnetic modulator (43) are respectively disposed at both ends in the moving direction of the impact block (41).

2. The drilling tool according to claim 1, wherein It further includes a first cylinder body (5) and a second cylinder body (7) sleeving the first cylinder body (5); the first cavity (1) is disposed in the first cylinder body (5), and the second cavity (2) is disposed between the first cylinder body (5) and the second cylinder body (7); joint cavities for respectively connecting a drill pipe and a drill bit are provided at both axial ends of the first cylinder body (5), and the first cavity (1) communicates with the two joint cavities.

3. The drilling tool according to claim 2, wherein A plurality of the second cavities (2) are provided in the second cylinder body (7), and all the second cavities (2) are annularly distributed; the electromagnetic excitation assembly (4) includes an annular magnetic modulator (43) and a plurality of impact blocks (41); all the impact blocks (41) are correspondingly arranged in all the second cavities (2), and all the impact blocks (41) are correspondingly distributed with the magnetic modulator (43).

4. The drilling tool according to claim 3, characterized in that, The electromagnetic excitation assembly (4) further includes a plurality of wedge-shaped limit blocks (44), and all the wedge-shaped limit blocks (44) are correspondingly disposed in all the second cavities (2); the impact block (41) moves between the first end and the second end of the second cavity (2), the thickness of the wedge-shaped limit block (44) gradually increases from the first end to the second end of the second cavity (2), and one side surface of the impact block (41) is in sliding fit with the wedge surface of the wedge-shaped limit block (44); the locking portion includes a fastener (45), and the fastener (45) is used to penetrate from the second cylinder body (7) and the second end of the wedge-shaped limit block (44) and press the impact block (41).

5. The drilling tool according to claim 4, wherein Any one of the wedge-shaped limit blocks (44) is close to the outer side of the corresponding second cavity (2); the first cylinder body (5) is adjacent to the inner sides of all the second cavities (2).

6. The drilling tool according to claim 2, characterized in that The electromagnetic excitation assembly (4) further includes a buffer member (46); the magnetic modulator (43) includes a working surface facing the second cavity (2), and the buffer member (46) covers the working surface.

7. The drilling tool according to claim 6, characterized in that The buffer member (46) is specifically a buffer disc spring.

8. The drilling tool according to any one of claims 2 to 7, characterized in that, The high-pressure fluid jet excitation assembly (3) includes a hydraulic high-frequency generator (31) and an amplitude-varying control rod (32); the two joint cavities include a first joint cavity (61) for connecting a drill pipe and a second joint cavity (62) for connecting a drill bit. The hydraulic high-frequency generator (31) is arranged between the first joint cavity (61) and the first cavity (1), and the amplitude-varying control rod (32) is distributed along the central axis of the first cavity (1).

9. The drilling tool according to claim 8, wherein, Both the first joint cavity (61) and the second joint cavity (62) are provided as female-thread cavities.

10. The drilling tool according to claim 8, wherein, The high-pressure fluid jet excitation assembly (3) further includes a bushing (33); the bushing (33) wraps the amplitude-varying control rod (32).

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