Rock breaking device with adjustable frequency pulse particle jet and regulation method

Abstract

This disclosure relates to an adjustable frequency pulsed particle jet rock-breaking device and its control method. The device includes an upper connector, a frequency-adjustable thruster, a housing, an upper flow channel, a cavity liner, a lower flow channel, a lower connector, a PID drill bit, and frequency-increasing nozzles. An acceleration chamber is formed between the upper connector and the upper flow channel; a pulse modulation chamber is formed between the upper flow channel, the cavity liner, and the lower flow channel; a rectifier chamber is provided inside the lower flow channel; a flow stabilizing chamber is provided between the lower connector and the PID drill bit; the device is equipped with four frequency-increasing nozzles. The particle jet, composed of particles and drilling fluid, is accelerated through the acceleration chamber and then enters the pulse modulation chamber, causing the particle jet to produce a pulse effect. The solution provided in this disclosure can generate high-frequency, high-speed pulsed particle jets, and the pulse frequency can be adjusted to improve rock-breaking efficiency, increase drilling speed at lower drilling pressure and torque, and purify the bottom hole flow field, reducing repeated wear of particles, cuttings, and the drill bit.

Description

Technical Field

[0001] This disclosure relates to a supporting device used in the field of oil and gas drilling engineering, specifically, to a frequency-adjustable pulsed particle jet rock-breaking device and its control method. Background Technology

[0002] Oil and gas resources, as a national strategic resource, are crucial to national economic security and sustainable development. With my country's rapid economic development and the gradual depletion of shallow oil and gas resources, the development of deep oil and gas reservoirs in complex formations has gradually become a key focus of petroleum exploration. As drilling depths continue to increase and the targets of oil and gas exploration and development become increasingly complex, with rock formations exhibiting more complex geological conditions such as high temperature, high pressure, and high hardness, deep and ultra-deep well drilling technology for abrasion-resistant formations will become a pressing research direction for my country in the near future.

[0003] In deep oil and gas drilling, although the depth of hard and abrasion-resistant formations only accounts for 20% to 30% of the total size, the cost of drilling them accounts for about 70% of the total cost. This directly restricts the drilling speed of deep and ultra-deep wells and the overall benefits of exploration and development. Conventional mechanical rock breaking methods (such as publication numbers CN104100504A, CN111764828A and CN115788313A) are difficult to further improve the drilling efficiency of deep and ultra-deep wells. Therefore, it is necessary to find a high-efficiency rock breaking technology for hard and abrasion-resistant formations to achieve rapid drilling in hard rock deep wells.

[0004] Pulsed particle jet rock breaking is a new technology found by technicians. However, some existing pulse frequency modulation technical solutions in jet drilling and related fields, such as those shown in publication numbers CN103157562A and CN202152634U, have some problems: they either require the removal and replacement of parts or the installation of moving parts. Such structures result in high time costs, complex operation, and increased impact of high-speed erosion, making them difficult to adapt to complex and variable geological environments. Summary of the Invention

[0005] This disclosure proposes an adjustable frequency pulsed particle jet rock breaking device and control method, which can solve the existing technical problems pointed out in the background art. It can adjust the most suitable particle jet pulse frequency for different rock geological environments to reduce the destructive intensity of the rock strata. It has the characteristics of high efficiency, low wear and safety and stability.

[0006] The present disclosure discloses a frequency-adjustable pulsed particle jet rock-breaking device, basic scheme 1: including an upper connector 1 and a lower connector 7, the unique feature of which is that the device also includes a frequency-adjustable thruster 2, a housing 3, an upper flow channel 4, a cavity liner 5, a lower flow channel 6, a PID drill bit 8, and a frequency-increasing nozzle 9.

[0007] The lower end of the upper connector 1 is threaded to the upper end of the housing 3; the lower end of the housing 3 is first connected to the lower flow channel 6, and then threaded to the lower connector 7; the lower connector 7 is threaded to the PID drill bit 8; the PID drill bit 8 is equipped with a frequency-boosting nozzle 9; the upper flow channel 4 is clearance-fitted to the housing 3; the inner lining 5 of the cavity is interference-fitted to the housing 3.

[0008] The frequency-modulated thruster 2 is controlled by a host computer and includes a lead screw base 21 and a lead screw 22, which are installed in the upper connector 1.

[0009] The internal channel of the upper connector 1 and the "Y"-shaped flow channel inside the upper flow channel 4 form an acceleration cavity 41; the upper flow channel 4, the inner liner 5 of the cavity and the lower flow channel 6 form a pulse modulation cavity 51, which is used to adjust the pulse frequency of the particle jet accelerated by the upper flow channel 4; the lower flow channel 6, the lower connector 7 and the PID drill bit 8 form a flow stabilization cavity 81; the frequency-modulated thruster 2 is sealed to the upper flow channel 4 through the lead screw base 21 and the lead screw 22, forming a structure that can adjust the pulse frequency.

[0010] The upper end of the frequency modulation thruster 2 is screwed to the upper connector 1, and the lower end is threaded to the upper flow channel 4.

[0011] The tapered external thread at the upper end of the upper connector 1 is used to connect with the drill string.

[0012] The lower flow channel 6 is threadedly connected to the housing 3; the upper end of the lower connector 7 is threadedly connected to the housing 3.

[0013] Based on the basic scheme 1, further optimization yields scheme 2: the frequency modulation thruster 2 drives the lead screw 22 to rotate forward or reverse, causing the upper flow channel 4 to move up or down, thereby changing the size of the pulse modulation cavity 51.

[0014] Further optimization of Scheme 2 yields Scheme 3:

[0015] The upper flow channel 4 is driven by the frequency-modulated propeller 2 to rotate the lead screw 22, causing the upper flow channel 4 to slide up or down on the housing 3.

[0016] Furthermore, solution 4 is obtained: the lower flow channel 6 has a flow channel inside, and the flow channel forms a rectifier cavity 61.

[0017] Further, solution 5 is obtained: the PID drill bit 8 is provided with 4 frequency-increasing nozzles 9, which are connected to the PID drill bit by threads. The 4 frequency-increasing nozzles 9 are respectively located at the center of the bottom of the PID drill bit 8 and evenly distributed on the circumference of the bottom of the drill bit. All 4 frequency-increasing nozzles are connected to the PID drill bit 8.

[0018] The mixed fluid of particles and drilling fluid enters the acceleration chamber 41 through the upper connector 1 to accelerate the particle jet. After entering the pulse modulation chamber 51 to generate a pulsed particle jet, it then enters the rectifier chamber 61 and the flow stabilization chamber 81 to stabilize the flow. Finally, it is ejected through the frequency-increasing nozzle 9 to impact the rock at the bottom of the well.

[0019] Another aspect of this disclosure is to provide a method for controlling a frequency-adjustable pulsed particle jet rock-breaking device, comprising the following steps:

[0020] First, the natural frequency f of the rock is determined based on the rock geological information;

[0021] Then, the host computer system used to control the frequency-modulated thruster calculates the distance d that needs to be adjusted based on the rock frequency;

[0022] Based on the calculated distance d, the host computer system sends a control signal to determine the rotational speed n of the frequency modulation thruster 2;

[0023] The frequency-modulated thruster 2 drives the lead screw 22 to rotate; the lead screw base 21 converts the rotational motion of the lead screw 22 into the linear motion of the upper flow channel 4.

[0024] When the upper flow channel 4 reaches the predetermined distance d, the frequency-modulated thruster 2 stops moving.

[0025] The change in position of the upper flow channel 4 causes a change in the volume of the pulse modulation cavity 51, and the pulse frequency of the particle jet flowing through it is modulated to f.

[0026] Furthermore, the rock geological information is obtained through a logging-while-drilling system;

[0027] The host computer system sends control signals via any of the following methods: cable, pulse, electromagnetic wave, ultrasonic wave, or acoustic wave signal transmission.

[0028] Furthermore, this disclosure also provides another aspect of the application, namely, a specific connection method for applying the aforementioned frequency-adjustable pulsed particle jet rock-breaking device to deep wells, ultra-deep wells, or abrasion-resistant formation drilling.

[0029] Connect using the following method:

[0030] The frequency modulation thruster is assembled, and waterproof sealing is performed before assembly;

[0031] Install the assembled frequency modulation thruster onto the two corresponding interfaces at the lower end of the upper connector and secure it with screws;

[0032] Connect the upper end of the lower channel to the lower ends of the two frequency-modulated thrusters with threads, and perform axis alignment so that the axes of the upper connector, frequency-modulated thrusters, and upper channel coincide.

[0033] The tapered internal thread at the upper end of the housing and the tapered external thread at the lower end of the upper connector are connected by a thread for sealing.

[0034] The internal thread at the lower end of the protective shell is sealed to the external thread at the upper end of the lower flow channel through the thread.

[0035] The upper external thread of the lower flow channel is sealed to the lower external thread of the housing through the thread;

[0036] The tapered internal thread at the lower end of the housing and the tapered external thread at the upper end of the lower connector are connected by a thread for sealing.

[0037] The lower end of the lower connector has a tapered internal thread, which is sealed to the upper end of the PID drill bit via a threaded connection.

[0038] The four internal threaded holes at the lower end of the PID drill bit are sealed to the external threads of the four frequency-boosting nozzles through threads.

[0039] The above-described at least one technical solution adopted in one or more embodiments of this specification can achieve the following beneficial effects:

[0040] First, the adjustable frequency pulsed particle jet rock breaking device disclosed herein can increase the frequency and speed of the pulsed particle jet through the frequency-increasing nozzle, generating a high-frequency and high-speed particle jet that can destroy the integrity and compaction of hard and wear-resistant formations, thereby reducing the rock breaking strength. This allows for a significant increase in drilling speed at lower drilling pressure and torque, ensuring the safety and stability of the drilling system.

[0041] Secondly, this disclosure provides an adjustable frequency pulsed particle jet rock-breaking device that can adjust the pulse frequency of the particle jet according to the geological environment of the rock strata, thereby improving the rock-breaking efficiency.

[0042] Furthermore, the pulse jet generated by the frequency-adjustable pulsed particle jet rock-breaking device disclosed herein can accelerate and enhance the flow of the bottom hole flow field, purify the bottom hole flow field, and improve the phenomenon of repeated wear between particles, rock cuttings, and drill bits.

[0043] Furthermore, the pulse jet generated by the frequency-adjustable pulse particle jet rock-breaking device disclosed herein is designed with a combination of three circumferential nozzles and one central nozzle to ensure that the rock-breaking speed of the central nozzle and the circumferential nozzles is equal, thereby avoiding uneven breaking speed and energy waste.

[0044] In addition, the frequency-adjustable pulsed particle jet rock-breaking device disclosed herein can also improve the rock-breaking speed and purify the flow field by relying on the frequency-adjustable pulsed water jet when the particles are exhausted or insufficient.

[0045] Furthermore, the control method of the adjustable pulsed particle jet rock-breaking device disclosed herein can automatically adjust the pulse frequency through a host computer system, or manually adjust the pulse frequency by sending a signal.

[0046] In summary, the technical solution presented in this disclosure can not only generate high-frequency and high-speed pulsed particle jets, but also adjust the pulse frequency according to the geological environment of the rock strata, thereby improving rock breaking efficiency and significantly increasing drilling speed under lower drilling pressure and torque.

[0047] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0048] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the specification, serve to illustrate the technical solutions of this disclosure.

[0050] Figure 1 This is a cross-sectional structural schematic diagram of the frequency-adjustable pulsed particle jet rock-breaking device described in this disclosure.

[0051] Figure 2 This is an exploded view, or a top-down view, of the frequency modulation drive section described in this disclosure.

[0052] Figure 3 This is an exploded view, or a downward angle view, of the frequency modulation drive section described in this disclosure.

[0053] Figure 4 This is a schematic cross-sectional view of the PID drill bit described in this disclosure.

[0054] Figure 5 This is an exploded view of the PID drill bit and modulation nozzle described in this disclosure.

[0055] Figure 6 This is a frequency control flowchart of the frequency-adjustable pulsed particle jet rock-breaking device described in this disclosure.

[0056] Figure 7 This is a schematic diagram of the minimum limit position of the pulse modulation cavity described in this disclosure.

[0057] Figure 8 This is a schematic diagram of the maximum limit position of the pulse modulation cavity described in this disclosure.

[0058] Figure 9 This is a schematic diagram of the PID drill bit described in this disclosure during operation.

[0059] In the diagram, 1-connector, 2-frequency modulated thruster, 21-screw base, 22-screw, 3-housing, 4-upper flow channel, 5-chamber liner, 6-lower flow channel, 7-lower connector, 8-PID drill bit, 9-frequency upscaling nozzle. Detailed Implementation

[0060] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0061] The term "exemplary" as used herein means "serving as an example, embodiment, or illustration." Any embodiment illustrated herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. The following specific embodiments provide an adjustable frequency pulsed particle jet rock-breaking device suitable for drilling in abrasion-resistant formations in deep and ultra-deep wells.

[0062] First, let me briefly describe this type of adjustable frequency pulsed particle jet rock-breaking device, which includes an upper connector, a frequency-adjustable thruster, a screw stabilizer, a screw, a housing, an upper flow channel, a chamber liner, a lower flow channel, a lower connector, a PID drill bit, and a frequency-adjustable nozzle. Specifically, it includes the upper flow channel, the chamber liner, and the lower flow channel installed within the housing. The upper connector also houses the frequency-adjustable thruster; the lower flow channel contains the screw stabilizer and the screw.

[0063] Preferably, an acceleration chamber is formed by the internal channel of the upper connector and the "Y"-shaped flow channel inside the upper flow channel; a pulse modulation chamber is formed by the upper flow channel, the inner lining of the chamber, and the lower flow channel; a flow stabilization chamber is formed by the lower flow channel, the lower connector, and the PID drill bit; and the frequency-modulated thruster is connected to the upper flow channel in a sealed manner through a screw stabilizer and a screw, forming a structure that can modulate the pulse frequency.

[0064] The mixed fluid of particles and drilling fluid enters the acceleration chamber through the upper connector to accelerate the particle jet. After entering the pulse modulation chamber, the pulsed particle jet is generated. Then, it enters the rectification chamber and the flow stabilization chamber to stabilize the flow. Finally, it is ejected through the frequency-increasing nozzle to impact the rock at the bottom of the well.

[0065] The upper end of the upper connector has a tapered external thread that connects to the drill string, and the lower end has a threaded connection to the housing. The frequency-modulated thruster includes a lead screw base and a lead screw. The upper end of the frequency-modulated thruster is screwed to the upper connector, and the lower end is threaded to the upper flow channel. The frequency-modulated thruster drives the lead screw to rotate forward or backward, causing the upper flow channel to move up or down, thus changing the size of the pulse modulation cavity.

[0066] The upper flow channel moves on the casing under the drive of the frequency-modulated propeller. It has two main functions: first, its upper end forms an acceleration cavity with the upper connector to accelerate the particle jet; second, its lower end forms a pulse modulation cavity with the cavity liner and the lower flow channel.

[0067] The pulse modulation cavity is mainly used to adjust the pulse frequency of the particle jet accelerated by the upper flow channel.

[0068] The lower flow channel is threaded to the shell and has two main functions: first, the top end of the lower flow channel and the inner lining of the cavity form a pulse modulation cavity; second, the internal flow channel forms an independent rectifier cavity.

[0069] The lower connector has a threaded connection at its upper end to the housing and a threaded connection at its lower end to the PID drill bit. It is mainly used to form a flow-stabilizing cavity with the lower flow channel and the PID drill bit to achieve stable flow of the pulsed particle jet.

[0070] The PID drill bit is equipped with four frequency-boosting nozzles, which are connected to the PID drill bit by threads. One frequency-boosting nozzle is located at the center of the bottom of the PID drill bit, and three are evenly distributed around the circumference. All four frequency-boosting nozzles are connected to the PID drill bit.

[0071] like Figure 1 As shown, the cross-sectional structure of the frequency-adjustable pulsed particle jet rock-breaking device is displayed, including an upper connector 1, a frequency-adjustable thruster 2, a lead screw base 21, a lead screw 22, a housing 3, an upper flow channel 4, a cavity liner 5, a lower flow channel 6, a lower connector 7, a PID drill bit 8, and a frequency-increasing nozzle 9.

[0072] The lower end of the upper connector 1 is threaded to the upper end of the housing 3; the lower end of the housing 3 is first connected to the lower flow channel, and then connected to the lower connector 7; the lower connector 7 is connected to a PID drill bit 8; the PID drill bit 8 is equipped with a frequency-increasing nozzle 9; the upper flow channel 4 is clearance-fitted to the housing 3; the inner lining 5 of the cavity is interference-fitted to the housing 3; a frequency-modulated thruster 2 is installed inside the upper connector 1; and a lead screw base 21 and a lead screw 22 are provided inside the lower flow channel 6.

[0073] The internal channel of the upper connector 1 and the "Y"-shaped flow channel inside the upper flow channel 4 form an acceleration cavity 41; the upper flow channel 4, the inner lining 5 of the cavity and the lower flow channel 6 form a pulse modulation cavity 51; the lower flow channel 6, the lower connector 7 and the PID drill bit 8 form a flow stabilizing cavity 81; the frequency-modulated thruster 2 is sealed to the upper flow channel 4 through the lead screw base 21 and the lead screw 22 to form a structure that can adjust the pulse frequency.

[0074] Acceleration chamber 41 is connected to pulse modulation chamber 51 through upper flow channel 4; pulse modulation chamber 51 is connected to flow stabilization chamber 81 through lower flow channel 6; PID drill bit 8 is connected to frequency boosting nozzle 9.

[0075] The upper end of the upper connector 1 has a tapered external thread that connects to the drill string, and the lower end has a threaded connection to the housing 3. For example... Figure 2 and Figure 3 As shown, the frequency-modulated thruster 2 includes a lead screw base 21 and a lead screw 22. The upper end of the frequency-modulated thruster 2 is screwed to the upper connector 1, and the lower end is threaded to the upper flow channel 4. It is mainly used to move the upper flow channel 4, thereby adjusting the pulse frequency of the particle jet.

[0076] The upper flow channel 4 is driven by the frequency-modulated propeller 2 to rotate the lead screw 22, causing the upper flow channel 4 to slide up or down on the housing 3. The upper flow channel 4 has two main functions: first, the upper end forms an acceleration cavity 41 with the upper connector 1 to accelerate the particle jet; second, the lower end forms a pulse modulation cavity 51 with the inner lining 5 of the cavity and the lower flow channel 6.

[0077] The lower flow channel 6 is threadedly connected to the housing 3. It has two main functions: first, its top end, the lower end of the upper flow channel 4, and the inner lining 5 of the cavity form a pulse modulation cavity 51; second, the internal flow channel forms an independent rectifier cavity 61.

[0078] The lower connector 7 is threaded to the housing 3 at its upper end and to the PID drill bit 8 at its lower end. It is mainly used to form a flow stabilizing cavity 15 with the lower flow channel 6 and the PID drill bit 8 to achieve the flow stabilization effect of the pulsed particle jet.

[0079] like Figure 4 and Figure 5 As shown, the PID drill bit 8 is equipped with four frequency-increasing nozzles 9, which are connected to the PID drill bit by threads. One frequency-increasing nozzle 9 is located at the center of the bottom of the PID drill bit 8 and three are evenly distributed around the circumference. All four frequency-increasing nozzles 9 are connected to the PID drill bit 8 to realize the frequency increase and acceleration of the steady-flow pulsed particle jet.

[0080] like Figure 6 The diagram illustrates the control method for a frequency-adjustable pulsed particle jet rock-breaking device. The specific process is as follows: First, the natural frequency f of the rock is determined based on the rock geological information. Then, the host computer system calculates the distance d to be adjusted based on the rock frequency. The rotational speed n of the frequency-adjustable thruster 2 is determined based on the transmission signal from the host computer, which drives the lead screw 22 to rotate. The lead screw base 21 converts the rotational motion of the lead screw 22 into linear motion of the upper flow channel 4. When the movement distance of the upper flow channel 4 reaches the predetermined distance d, the frequency-adjustable thruster 2 stops moving. Since the position change of the upper flow channel 4 causes the volume of the pulse modulation cavity 51 to change, the pulse frequency of the flowing particle jet is modulated to f. When the pulse frequency is close to the natural frequency of the rock, a resonance phenomenon occurs, at which point the rock is most easily broken.

[0081] Figure 6The rock geological information described herein can be obtained through logging-while-drilling systems. The methods by which the host computer transmits signals to the downhole include cable, pulse, electromagnetic wave, ultrasonic, or acoustic signal transmission.

[0082] like Figure 7 and Figure 8 The diagram shows the two extreme positions of the pulse modulation cavity in the frequency-adjustable pulsed particle jet rock-breaking device, where the thick solid arrows indicate the direction of motion: when the frequency-adjustable thruster 2 rotates forward, it drives the upper flow channel 4 downward; when the movement distance reaches the set limit value, the motor stops moving, at which point... Figure 7 The pulse modulation cavity is shown as having its minimum limit position. When the frequency modulation thruster 2 reverses, it drives the upper flow channel 4 to move upward. When the movement distance reaches the set limit value, the motor stops moving. This is the position of the pulse modulation cavity. Figure 8 The maximum limit position of the pulse modulation cavity is shown.

[0083] In this adjustable frequency pulsed particle jet rock-breaking device, during drilling, the particle jet enters the acceleration chamber 41 through the flow channel of the upper connector 1 and is accelerated to form a high-speed particle jet. When the accelerated particle jet enters the pulse modulation chamber 51, the volume of the pulse modulation chamber is changed by the frequency-adjusting thruster 2, thereby adjusting the pulse frequency of the particle jet. Then, rectification and flow stabilization are achieved through the rectification chamber 61 and the flow stabilization chamber 81 in the lower flow channel 6. When the pulsed particle jet flows through the frequency-increasing nozzle 9, a secondary frequency increase and acceleration phenomenon occurs, forming a high-frequency, high-speed pulsed particle jet that impacts the hard, abrasion-resistant formation surface, thereby increasing the impact kinetic energy of the pulsed particle jet on the bottom rock and further improving rock-breaking efficiency and drilling speed.

[0084] The rock-breaking principle underlying the technical solution disclosed herein is that when a high-frequency, high-speed pulsed particle jet impacts hard rock, the particles generate extremely large instantaneous impact contact stress within a very small contact area. From a microscopic perspective, when the particle velocity exceeds 120 m / s, the instantaneous impact stress exceeds the compressive strength of the hard rock, and tensile and shear stresses are generated around the boundary of the impact contact area. When the tensile or shear stresses generated by the impact exceed the tensile or shear strength of the rock, numerous cracks or macroscopic damage will form within the rock. Simultaneously, the pulsed jet impact force will cause pressure changes within the cracks, further exacerbating crack propagation and rock fragmentation. From a macroscopic perspective, such as Figure 9 As shown, the high-speed impact of the pulsed particle jet will form an annular fracture groove at the contact surface of the rock at the bottom of the well, thereby eliminating the compaction effect of the rock at the bottom of the well and reducing the rock strength. The damaged rock can form a borehole with a lower rotational torque and axial drilling pressure under the action of the mechanical cutter.

[0085] The technical advantages of the solution disclosed herein are that it allows for the direct connection of a frequency-adjustable pulsed particle jet rock-breaking device to the downhole system without altering existing drilling equipment and processes; the particles and drilling fluid are modulated and accelerated to form a high-frequency, high-speed, pulsating particle jet, achieving rapid breaking of hard rock formations; it easily breaks rocks with lower drill bit pressure and torque, reducing well deviation and downhole accidents; the pulsed jet's pulsating and intensifying characteristics clean and purify rock cuttings and particles in the bottom hole flow field, improving drill bit wear; and the frequency of the pulsed particle jet can be automatically or manually adjusted according to different geological environments, making it suitable for a wider range of geological conditions.

[0086] The embodiments described above are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A frequency-adjustable pulsed particle jet rock-breaking device, comprising an upper connector (1) and a lower connector (7), characterized in that, The device also includes a frequency-modulated thruster (2), a housing (3), an upper flow channel (4), a cavity liner (5), a lower flow channel (6), a PID drill bit (8), and a frequency-increasing nozzle (9). The lower end of the upper connector (1) is threaded to the upper end of the housing (3); the lower end of the housing (3) is first connected to the lower flow channel (6), and then threaded to the lower connector (7); the lower connector (7) is threaded to the PID drill bit (8); the PID drill bit (8) is equipped with a frequency-boosting nozzle (9); the upper flow channel (4) is clearance-fitted to the housing (3); the inner lining (5) of the cavity is interference-fitted to the housing (3); The frequency-modulated thruster (2) is controlled by a host computer and includes a lead screw base (21) and a lead screw (22), which are installed in the upper connector (1); The internal channel of the upper connector (1) and the "Y"-shaped flow channel inside the upper flow channel (4) form an acceleration cavity (41); the upper flow channel (4), the inner lining of the cavity (5), and the lower flow channel (6) form a pulse modulation cavity (51), which is used to adjust the pulse frequency of the particle jet accelerated by the upper flow channel (4); the lower flow channel (6), the lower connector (7), and the PID drill bit (8) form a flow stabilizing cavity (81); the frequency-modulated thruster (2) is sealed to the upper flow channel (4) through the lead screw base (21) and the lead screw (22) to form a structure that can adjust the pulse frequency; The upper end of the frequency modulation thruster (2) is screwed to the upper connector (1), and the lower end is threaded to the upper flow channel (4); The tapered external thread at the upper end of the upper connector (1) is used to connect with the drill string; The lower flow channel (6) is threadedly connected to the housing (3); the upper end of the lower connector (7) is threadedly connected to the housing (3).

2. The frequency-adjustable pulsed particle jet rock-breaking device according to claim 1, characterized in that: The frequency modulation thruster (2) drives the lead screw (22) to rotate forward or reverse, causing the upper flow channel (4) to move up or down, thereby changing the size of the pulse modulation cavity (51).

3. The frequency-adjustable pulsed particle jet rock-breaking device according to claim 2, characterized in that: The upper flow channel (4) is driven by the frequency-modulated propeller (2) to rotate the lead screw (22), causing the upper flow channel (4) to slide up or down on the housing (3).

4. The frequency-adjustable pulsed particle jet rock-breaking device according to claim 3, characterized in that: The lower flow channel (6) has a flow channel inside, which forms a rectifier cavity (61).

5. The frequency-adjustable pulsed particle jet rock-breaking device according to claim 4, characterized in that: The PID drill bit (8) is provided with four frequency-boosting nozzles (9), which are connected to the PID drill bit by threads. The four frequency-boosting nozzles (9) are located at the center of the bottom of the PID drill bit (8) and are evenly distributed on the circumference of the bottom of the drill bit. All four frequency-boosting nozzles are connected to the PID drill bit (8). The mixed fluid of particles and drilling fluid enters the acceleration chamber (41) through the upper connector (1) to accelerate the particle jet and then enters the pulse modulation chamber (51) to generate a pulsed particle jet. After entering the rectification chamber (61) and the stabilization chamber (81) to stabilize the flow, it is sprayed through the frequency-increasing nozzle (9) to impact the rock at the bottom of the well.

6. A method for controlling the frequency-adjustable pulsed particle jet rock-breaking device according to any one of claims 1 to 5, comprising the following steps: First, the natural frequency f of the rock is determined based on the rock geological information; Then, the host computer system used to control the frequency-modulated thruster calculates the distance d that needs to be adjusted based on the rock frequency; Based on the calculated distance d, the host computer system sends a control signal to determine the rotation number n of the frequency modulation thruster (2); The frequency-modulated thruster (2) drives the lead screw (22) to rotate; the lead screw base (21) converts the rotational motion of the lead screw (22) into the linear motion of the upper flow channel (4); When the upper channel (4) moves a predetermined distance d, the frequency-modulated thruster (2) stops moving; The change in position of the upper flow channel (4) causes a change in the volume of the pulse modulation cavity (51), and the pulse frequency of the particle jet flowing through it is modulated to f.

7. The method according to claim 6, characterized in that: The rock geological information was obtained through logging-while-drilling system; The host computer system sends control signals via any of the following methods: cable, pulse, electromagnetic wave, ultrasonic wave, or acoustic wave signal transmission.

8. A method for using the frequency-adjustable pulsed particle jet rock-breaking device according to any one of claims 1 to 5, characterized in that, It is used in drilling deep wells, ultra-deep wells, or abrasion-resistant formations. Connect using the following method: The frequency modulation thruster is assembled, and waterproof sealing is performed before assembly; Install the assembled frequency modulation thruster onto the two corresponding interfaces at the lower end of the upper connector and secure it with screws; Connect the upper end of the lower channel to the lower ends of the two frequency-modulated thrusters with threads, and perform axis alignment so that the axes of the upper connector, frequency-modulated thrusters, and upper channel coincide. The tapered internal thread at the upper end of the housing is sealed to the tapered external thread at the lower end of the upper connector through the thread. The internal thread at the lower end of the protective shell is sealed to the external thread at the upper end of the lower flow channel through the thread. The upper external thread of the lower flow channel is sealed to the lower external thread of the housing through the thread; The tapered internal thread at the lower end of the housing and the tapered external thread at the upper end of the lower connector are connected by a thread for sealing. The lower end of the lower connector has a tapered internal thread, which is sealed to the upper end of the PID drill bit via a threaded connection. The four internal threaded holes at the lower end of the PID drill bit are sealed to the external threads of the four frequency-boosting nozzles through threads.

Images