A liquid flow cavitation device

Abstract

The application discloses a liquid flow cavitation device, which comprises a shell with a top opening and a bottom opening; a free-moving working medium limited in the inner cavity of the shell, wherein a flow channel for liquid flow is arranged between the working medium and the cavity wall of the shell; and a resonance tail wing extending out of the bottom opening end face of the shell in the axial direction of the cavitation device is arranged on the shell. The liquid flow cavitation device can further enhance the cavitation effect of the cavitation device, increase the reconstruction effect on underground rock layers, improve the reservoir seepage capacity and the recovery rate.

Description

Technical Field

[0001] The present invention relates to the fields of petroleum, natural gas, coalbed methane and uranium mining, and in particular to a liquid flow cavitation device. Background Art

[0002] Currently, there are two main technologies used in oil extraction: hydraulic fracturing and ultrasonic cavitation.

[0003] Hydraulic fracturing is a production-increasing technique that injects fracturing fluid into an oil reservoir to create a primary fracture, thereby altering the oil flow pattern. The 1980s marked a significant period in the development of hydraulic fracturing, which has since become a crucial technique in the exploration and development of oil and gas, particularly low-permeability oil and gas. The hydraulic fracturing production-increasing mechanism: When a high-pressure pump set on the surface injects a high-viscosity liquid into a well at a rate exceeding the formation's absorption capacity, the pressure generated at the bottom of the well exceeds the in-situ stress near the wellbore wall and the rock's tensile strength, creating a fracture in the formation. As the proppant-laden fluid is injected into the formation, the fracture gradually extends forward, forming a sand-filled fracture of a defined length, width, and height. This fracture has a high conductivity, altering the oil and gas flow pattern.

[0004] However, hydraulic fracturing has the following disadvantages: (1) The process is complex and the operation cost is high. Hydraulic fracturing is a rigorous system engineering. If there is insufficient understanding of the reservoir geological conditions, improper well and layer selection, improper fracturing fluid selection, improper proppant selection, unreasonable design of fracturing construction parameters, improper construction scale, and improper post-fracturing drainage measures, it may lead to the failure of fracturing construction or reduce the production increase effect. What's more, it may have a serious impact on the later development and adjustment of the oil and gas field. Reservoir transformation technology is also a high-investment and high-risk technology. The operation cost of a single well is generally between hundreds of thousands and millions of yuan, and the cost of deep well operation is even more than 10 million yuan. (2) It seriously pollutes the oil well and formation. If the fracturing fluid is not selected properly, it may cause the clay minerals in the formation to expand, the crude oil to emulsify, mechanical impurities to be brought into the formation, and the formation water is incompatible with the formation water to form precipitation, which may cause damage to the formation. For acid fracturing, the liquid will also cause damage to the reservoir. The poor corrosion inhibition performance of the acid will also cause serious corrosion to the construction equipment and pipe string. Fracturing is a high-pressure operation, and the various chemicals used in the construction can also pose a serious threat to human life, property, and the ecological environment. (3) It has a great destructive effect on oil wells and formations. If fracturing is not done properly, it can cause serious consequences such as violent flooding of oil wells and reactive water injection, or it can press open the adjacent aquifers or the upper part of the reservoir containing the gas cap. In addition, improper drainage may increase the damage to the reservoir, which may cause proppant backflow and cause permanent damage to the formation and oil wells. (4) The introduction of artificial main fractures exacerbates the heterogeneity of the reservoir, which may have an adverse impact on the development of oil and gas reservoirs.

[0005] Ultrasonic oil recovery technology is one of the tertiary oil recovery technologies developed in recent decades. Ultrasonic cavitation plugging removal and oil production enhancement technology is also known as high-power ultrasonic plugging removal technology. The new ultrasonic oil production enhancement system mainly consists of a magnetic positioning system, special transmission cables, a high-power ultrasonic electrical signal transmitter, and an ultrasonic electroacoustic converter. It uses a high-power pulsed electrical oscillation signal generated by a high-power ultrasonic transmitter on a ground vehicle. Through a special transmission cable, the pulsed electrical oscillation signal is transmitted to the piezoelectric ceramic electroacoustic converter in the oil layer. The electroacoustic converter converts the pulsed electrical oscillation signal into ultrasonic waves and injects them into the oil-bearing formation. By ultrasonically treating the near-wellbore oil layer of production oil wells and water injection wells, the physical properties and flow state of the fluid in the oil layer are changed, the flow conditions and permeability in the near-wellbore area are improved, the blockage of oil and water injection wells is relieved, and the liquid recovery, crude oil production, and water injection volume are increased to achieve the goal of increasing production.

[0006] However, ultrasonic cavitation has the following disadvantages: (1) Ultrasonic cavitation can only be used for unblocking near the wellbore. The liquid medium generates cavitation bubbles, which requires the ultrasonic wave to have a certain intensity. The greater the ultrasonic wave power, the better the unblocking effect. However, the attenuation rate of ultrasonic waves is extremely fast. Studies have shown that the sound intensity at the wellbore wall is attenuated to 45% of the sound source, and the sound intensity at a radius of 1 meter in the porous medium geometric model is attenuated to 10% of the wellbore wall. Therefore, the cavitation effect generated by ultrasonic waves can only act in the near-wellbore area, with a maximum effective radius of only 15 meters, so the effect is limited. (2) The cavitation area is in a non-flowing state. The cavitation area (or cavitation) formed around the cavitator is limited in scope. As the hydrostatic (external) pressure increases, the liquid flow cannot be interrupted to form cavitation under high hydrostatic pressure in deep oil wells. According to the numerical requirements of cavitation, in order to produce gaps in the liquid flow, the liquid must be pumped at an extremely high speed, but this extremely high speed cannot be achieved in all cases, especially in deep wells or extended pipelines; under very high external hydrostatic pressure, such as in deep wells, cavitation effect cannot be obtained using ultrasonic waves. (3) Due to the limitation of treatment time, the operation effect is limited. The cumulative ultrasonic treatment time has a great influence on the unblocking effect, but after the treatment time exceeds 60 minutes, the unblocking effect does not increase significantly; the higher the ultrasonic frequency, the greater the attenuation during the propagation process, and the unblocking effect becomes worse. (4) The technical supporting equipment is complex, the operation cost is high, and the requirements for the operating environment are relatively high. (5) It is not suitable for oil wells with an inclination greater than 45 degrees.

[0007] Today, natural gas and coalbed methane extraction primarily utilizes the hydraulic fracturing technology described above, which, of course, also presents the aforementioned problems. Furthermore, hydraulic fracturing in coalbed methane wells can cause coal dust drift and blockage, a problem that currently remains unresolved.

[0008] Currently, uranium mining primarily relies on solution leaching. However, permeability varies significantly across the ore-bearing layer profile, resulting in uneven solution flow. These variations in permeability and uneven distribution of the leachate significantly impact leaching equilibrium, directly affecting the uranium concentration and leaching rate of the leachate. Furthermore, during leaching, as the in-situ leaching system operates, physical blockage of the ore-bearing layer caused by the migration of the leachate and fine particles within the ore layer, as well as chemical blockage caused by the interaction of the leachate with the minerals, further alters the permeability of the ore-bearing layer, changing the reservoir structure, reducing the permeability coefficient of the ore-bearing layer, reducing the injection flow rate, and even causing some injection holes to lose production capacity, severely impacting production operations. These problems have long plagued in-situ leaching mines, and to date, no effective method has been found to address the heterogeneity of leaching in heterogeneous ore-bearing layers.

[0009] To address these issues, the Chinese patent application "Liquid Flow Cavitation Device, Liquid Flow Cavitation System, and Liquid Flow Cavitation Method," published under the publication number CN105201482A, provides a liquid flow cavitation device that generates cavitation in a liquid, releasing powerful internal energy from the liquid. The resulting shock wave conducts through a large number of micro-fractures in the reservoir, thereby increasing the reservoir pore throats, effectively improving the reservoir's permeability, significantly increasing the reservoir's homogeneity, and enhancing the recovery rate. Based on this, the designers discovered that further improvements to the structure of the aforementioned cavitation device could further enhance the cavitation effect of the device, increase the transformation effect on the underground rock formation, and improve the reservoir's permeability and recovery rate. Summary of the Invention

[0010] In view of the above problems, the object of the present invention is to provide a liquid flow cavitation device to further enhance the cavitation effect of the cavitator, increase the transformation effect of underground rock formations, and improve the reservoir seepage capacity and recovery rate.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] The present invention provides a liquid flow cavitation device, the cavitation device comprising:

[0013] a housing having a top opening and a bottom opening;

[0014] A freely movable working medium is confined in the inner cavity of the shell, and a flow channel for liquid flow is provided between the working medium and the inner cavity wall of the shell;

[0015] The cavitation device further comprises a resonance tail wing located on the shell and extending out of the bottom opening end surface of the shell along the axial direction of the cavitation device.

[0016] In addition, a preferred solution is that the cavitation device includes a plurality of resonance tail fins uniformly arranged along the circumferential direction of the shell; and a spacing space is left between the side walls of two adjacent resonance tail fins.

[0017] In addition, a preferred solution is that the resonance tail wing and the shell are an integral structure, and the resonance tail wing extends from the edge of the bottom opening of the shell along the axial direction of the cavitation device.

[0018] In addition, a preferred solution is that the resonant tail and the housing are separate structures; the cavitation device includes a resonant member, and the resonant member includes:

[0019] an annular fixing portion connected and fixed to the bottom of the shell, and

[0020] a vibrating portion located on the fixing portion and uniformly arranged along the circumferential direction of the fixing portion, the vibrating portion extending along the axial direction of the fixing portion;

[0021] The vibrating portion of the resonant member forms a resonant tail wing of the cavitation device.

[0022] In addition, a preferred solution is that the cavitation device includes a plurality of resonance tail fins evenly arranged along the circumferential direction of the shell; the spacing between the side walls of two adjacent resonance tail fins is not less than one-third of the width of the resonance tail fin and not more than twice the width of the resonance tail fin.

[0023] In addition, a preferred solution is that the inner wall surface of the resonance tail wing is a curved surface or a flat surface, and the outer wall surface of the resonance tail wing is a curved surface.

[0024] In addition, a preferred solution is that the inner wall surface of the resonant tail wing and the inner cavity wall surface of the corresponding shell are arc surfaces with the same curvature;

[0025] In the axial direction of the cavitation device, the projections of the inner wall surface of the resonance tail wing and the corresponding inner cavity wall surface of the shell on the horizontal plane are located on the same arc line.

[0026] In addition, a preferred solution is that the thickness of the resonance tail wing in the radial direction decreases gradually from the end of the resonance tail wing close to the bottom opening of the shell to the end away from the bottom opening of the shell.

[0027] In addition, it is preferred that, in the axial direction of the cavitation device, the length of the resonance tail wing is no more than 45% of the length of the shell.

[0028] In addition, it is preferred that the cavitation device includes a plurality of upper baffles adjacent to the top opening of the shell, and a lower baffle adjacent to the bottom opening of the shell;

[0029] The upper baffles are formed by the inner cavity wall of the shell protruding inwardly, and are used to prevent the working medium from escaping from the shell through the top opening of the shell;

[0030] The lower baffle protrudes inward from the inner cavity wall of the shell to prevent the working medium from escaping from the shell through the bottom opening of the shell;

[0031] The bottom surface of the upper partition is a plane, an angle is formed between the axis of the upper partition and the axis of the cavitation device, and two adjacent upper partitions are arranged in parallel.

[0032] The beneficial effects of the present invention are as follows:

[0033] 1. Compared with the existing cavitator structure, when the liquid flow in the liquid flow cavitation device provided by the present invention flows out from the bottom opening of the shell, vortices are alternately generated around the high-speed fluid, causing lateral vibrations of a certain frequency. When the vibration frequency approaches the resonant frequency of the resonant tail, the resonant tail is excited to vibrate, radiating sound waves to the surrounding liquid and generating cavitation near the tail.

[0034] The bubbles within the cavitation zone flow with the liquid, forming a cavitation field within the flow field. The lateral vibration of the resonant tail accompanied by the effect of acoustic radiation prevents the cavitation bubbles in the cavitation field from merging, increasing the number of cavitation bubbles and further strengthening the cavitation intensity. In addition, due to the transferability of acoustic energy, the flowing bubbles continuously produce cavitation phenomena under the transfer effect, forming a multi-stage cavitation effect.

[0035] The resonant tail vibration stimulates the large-scale vibration of the bubble, making the bubble a good energy storage device. Under the action of the sound field, it produces an energy-gathering effect, greatly increasing the energy density in the bubble by more than ten orders of magnitude.

[0036] 2. The resonant tail vibrates left and right under the action of cavitation, squeezing the water flow. That is, it is affected by the pressure difference between the internal and external water flows, causing the resonant tail to vibrate left and right. The resonant tail provides new vibration waves and sound waves generated by vibration. The sound waves are transmitted along the radial direction of the device. The two form new vibration energy, which further enhances the cavitation effect and increases the transformation effect on the underground rock formation.

[0037] 3. The vibration waves and sound waves generated by the resonant tail vibration resonate with the self-excited oscillation and cavitation energy of the device. This resonance effect acts on the device, further enhancing the energy waves generated by the self-excited oscillation and cavitation of the device.

[0038] 4. The effect of the pulsed liquid flow on the resonant tail can make the frequency of the sound waves generated by the resonant tail not fixed, but change with the change of the pulsed water flow, which can form a resonance effect with the self-excited oscillation of the device, increase the impact on the underground rock formation, and improve the cavitation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Figure 1 A schematic diagram of the external structure of the liquid flow cavitation device provided by the present invention is shown.

[0041] Figure 2A structural cross-sectional view showing a specific embodiment of the liquid flow cavitation device provided by the present invention.

[0042] Figure 3 A structural cross-sectional view showing another specific embodiment of the liquid flow cavitation device provided by the present invention.

[0043] Figure 4 Show Figure 3 Schematic diagram of the structure of the resonant component in the liquid flow cavitation device structure shown. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0045] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0046] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0047] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0048] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0049] In order to further enhance the cavitation effect of the cavitator, increase the transformation effect of underground rock formations, and improve the reservoir seepage capacity and recovery rate, combined with Figures 1 to 4 As shown, the present invention provides a liquid flow cavitation device; specifically, firstly, combined with Figure 1 as well as Figure 2 As shown, in one embodiment, the cavitation device includes:

[0050] A housing 1 having a top opening 11 and a bottom opening 12;

[0051] A freely movable working medium 2 is confined in the inner cavity of the shell 1 , and a flow channel 3 for liquid flow is provided between the working medium 2 and the inner cavity wall of the shell 1 ; there is no mechanical connection between the working medium and the shell.

[0052] The cavitation device further comprises a resonance tail wing 4 located on the shell 1 and extending out of the end surface of the bottom opening 12 of the shell 1 along the axial direction of the cavitation device.

[0053] Compared with the existing liquid flow cavitator, the liquid flow cavitation device provided by the present invention has the following characteristics: during operation, the liquid flow (water) enters the device from the top, passes through the working medium, and flows out from the bottom of the device. The working medium oscillates to generate a pulsed water flow, and the device itself generates self-excited oscillation. The water discharged from the bottom of the device forms a liquid cavitation field containing a large number of cavitation bubbles. The cavitation bubbles are quickly squeezed in the liquid and burst continuously.

[0054] In addition, eddies are alternately generated around the high-speed fluid, causing lateral vibrations of a certain frequency. When the frequency of the vibration is close to the resonant frequency of the resonant tail fin, the resonant tail fin is excited to vibrate, radiating sound waves to the surrounding liquid and generating cavitation near the tail fin.

[0055] The bubbles within the cavitation zone flow with the liquid, forming a cavitation field within the flow field. The lateral vibration of the tail accompanied by the effect of acoustic radiation prevents the cavitation bubbles in the cavitation field from merging, increasing the number of cavitation bubbles and further strengthening the cavitation intensity. Furthermore, due to the transferability of acoustic energy, the flowing bubbles continuously generate cavitation under the transfer effect, forming a multi-stage cavitation effect.

[0056] Furthermore, the vibration of the tail wing stimulates the large-scale vibration of the bubble, making the bubble a good energy storage device, producing an energy-gathering effect under the action of the sound field, and greatly increasing the energy density in the bubble by more than ten orders of magnitude.

[0057] The liquid flow cavitation device provided by the present invention utilizes a resonant tail to vibrate left and right under the action of cavitation, squeezing the water flow. That is, the resonant tail is affected by the pressure difference between the internal and external water flows, causing the resonant tail to vibrate left and right. The resonant tail provides new vibration waves and sound waves generated by vibration. The sound waves are transmitted along the radial direction of the device. The two form additional vibration energy, further enhancing the cavitation effect and increasing the transformation effect on the underground rock formation.

[0058] Furthermore, the vibration waves and sound waves generated by the resonant tail vibration produce a resonance effect with the self-excited oscillation and cavitation energy of the device, and this resonance effect acts on the liquid flow cavitation device, further enhancing the self-excited oscillation and cavitation energy waves generated by the liquid flow cavitation device.

[0059] The effect of the pulsed liquid flow on the resonant tail in the present invention can make the frequency of the sound waves generated by the resonant tail not fixed, but change with the change of the pulsed water flow, which can form a resonance effect with the self-excited oscillation of the device, increase the impact on the underground rock formation, and improve the cavitation effect.

[0060] Optionally, the cavitation device provided by the present invention includes a plurality of resonant tail fins 4 evenly arranged along the circumference of the housing 1. No fewer than three resonant tail fins 4 are arranged along the circumference of the housing 1, with space between the sidewalls of adjacent resonant tail fins. Furthermore, the spacing between the sidewalls of adjacent resonant tail fins 4 is no less than one-third of the width of the resonant tail fin 4 and no more than twice the width of the resonant tail fin 4. This ensures that there are no blind spots in the angle of influence of vibration transmission from the resonant tail fins 4.

[0061] In this embodiment, the resonant tail fin 4 is integrally formed with the housing 1, extending from the edge of the bottom opening 12 of the housing 1 along the axial direction of the cavitation device. Optionally, the housing 1 is integrally formed of a high-strength metal material. When the resonant tail fin 4 vibrates laterally under the action of high-speed fluid cavitation, the integral structure facilitates resonance with the self-excitation of the device.

[0062] Combine Figure 3 as well as Figure 4 As shown, in another embodiment, the resonant tail and the housing are separate structures; specifically, the cavitation device includes a resonant member 5, and the resonant member 5 includes:

[0063] an annular fixing portion 51 connected and fixed to the bottom of the housing 1, and

[0064] The vibrating portion 52 is located on the fixing portion 51 and is evenly arranged along the circumferential direction of the fixing portion. The vibrating portion 52 extends along the axial direction of the fixing portion 51 . The vibrating portion 52 of the resonant member 5 forms the resonant tail 4 of the cavitation device.

[0065] The connection and fixing method between the annular fixing portion 51 of the resonance member 5 and the shell 1 can adopt the connection methods well known in the art, including but not limited to screw connection, clamping, welding, and plug-in connection. Its advantage is that designing the resonance tail wing and the shell as a split structure can facilitate the independent processing and manufacturing of the resonance member and the shell, and facilitate disassembly and assembly. In different application scenarios and different conditions, resonance members with different numbers of resonance tail wing can be selected, which expands the scope of application of the cavitation device. In addition, for the resonance tail wing material selected for the resonance member, a metal material with high elasticity and strength different from the shell can be selected for processing, such as high carbon alloy or copper alloy and stainless steel material. Combined with Figure 4 As shown, in this embodiment, the annular fixing portion 51 includes a reinforcing rib 53 for increasing the structural strength of the annular fixing portion 51. Optionally, the reinforcing rib can also serve as a lower baffle for limiting the freely movable working medium in the inner cavity of the shell.

[0066] In an optional embodiment, the inner wall surface of the resonant tail 4 is a curved surface or a flat surface, and the outer wall surface of the resonant tail 4 is a curved surface. It should be noted that, in an optional embodiment, when the inner surface of the resonant tail 4 adopts a flat structure, the lateral vibration effect of the resonant tail 4 can be improved.

[0067] In another optional embodiment, in order to ensure that the cavitation bubbles do not burst prematurely due to changes in flow pressure during the process of being transported out of the cavity with the flowing liquid, the inner wall surface of the resonant tail fin 4 and the corresponding inner cavity wall surface of the shell 1 are arc surfaces with the same curvature; in the axial direction of the cavitation device, the inner wall surface of the resonant tail fin 5 and the corresponding inner cavity wall surface of the shell 1 are projected on the same arc on the horizontal plane.

[0068] In conjunction with the illustrated structure, the radial thickness of the resonant tail fin 4 decreases from the end of the resonant tail fin 4 closest to the bottom opening 12 of the housing 1 to the end farther from the bottom opening 12 of the housing 1. This enhances the new vibration waves and acoustic effects of the vibration-generated sound provided by the resonant tail fin. The enhanced vibration waves and acoustic waves generated by the vibration of the resonant tail fin resonate with the self-excited oscillation and cavitation energy of the device. This resonance effect, in turn, acts on the liquid flow cavitation device, further enhancing the energy waves generated by the self-excited oscillation and cavitation of the liquid flow cavitation device.

[0069] Since the length of the resonance tail affects its amplitude frequency and sound wave intensity, the length of the resonance tail in the axial direction of the cavitation device should not be too long or too short. Taking into account the material strength of the resonance tail and the intensity of the vibration waves and sound wave effects it acts on the cavitation device, it is preferred that the length of the resonance tail in the axial direction of the cavitation device is not greater than 45% of the shell length.

[0070] In the present invention, the cavitation device includes a plurality of upper baffles 111 adjacent to the top opening 11 of the shell 1, and a lower baffle 121 adjacent to the bottom opening 12 of the shell 1; the plurality of upper baffles 111 can be formed by protruding inward from the inner cavity wall of the shell 1, and are used to prevent the working medium 2 from escaping from the shell 1 from the top opening 11 of the shell 1; the lower baffle 121 can be protruding inward from the inner cavity wall of the shell 1, and is used to prevent the working medium 2 from escaping from the shell 1 from the bottom opening 12 of the shell 1; the bottom surface of the upper baffle 111 is a plane, and an angle is formed between the axis of the upper baffle 111 and the axis of the cavitation device, and adjacent upper baffles 111 are arranged in parallel.

[0071] The upper baffle 111 can be integrally formed with the housing, or can be formed on the housing 1 using other metal materials or high-strength engineering plastics. Similarly, the lower baffle 121 can be integrally formed with the housing 1, and can have a straight or cross-shaped structure, or employ other structural styles that can be used to prevent the working fluid 2 from escaping the housing through the bottom opening 12 of the housing 1. The working fluid 2 can be a perfect circle or an eccentric sphere. In addition to metal, the working fluid can also be made of other materials such as high-strength engineering plastics and rubber, thereby reducing the impact of the working fluid on the interior of the housing and the upper and lower baffles, thereby extending the service life of the device.

[0072] The present invention utilizes a plurality of upper baffles arranged at an angle relative to the shell. After the liquid flow enters the inner cavity of the shell, it passes through the guidance of the upper baffles, which can cause the liquid flow to rotate in a clockwise or counterclockwise direction on the working fluid, thereby increasing the self-rotation of the working fluid. By utilizing the self-rotation of the working fluid, the impact force between the working fluid and the inner cavity wall of the shell can be reduced, while enhancing the cavitation effect.

[0073] Different working fluid structures are suitable for different product structures and have different advantages. Regarding the structural form of the working fluid, the present invention provides the following optional implementation methods.

[0074] In one embodiment, the working medium is a spherical structure, and the spherical working medium is confined in the inner cavity of the shell and can move freely. A flow channel for the liquid flow is included between the working medium and the inner cavity wall of the shell.

[0075] In an alternative embodiment, the working fluid has a cylindrical structure, preferably, the cylindrical structure is cylindrical along the direction of liquid flow. Alternatively, the working fluid may have a conical structure, preferably, the conical structure gradually tapers along the direction of liquid flow. Alternatively, the working fluid has an annular structure, preferably, the annular structure is annular in a plane perpendicular to the direction of liquid flow, similar to a donut shape. Optionally, the working fluids of the above-mentioned structures may include through holes or be solid.

[0076] In an optional embodiment, a freely movable gasket and / or spring pad may be provided below the working fluid, and the gasket and / or spring pad are also confined within the housing cavity. Specifically, the gasket and / or spring pad are positioned within the housing cavity below the working fluid and above the lower baffle. In the present invention, when cavitating the liquid flow, the working fluid vibrates in conjunction with the gasket and / or spring pad, thereby enhancing the cavitation effect of the liquid flow cavitation device provided by the present invention.

[0077] In a preferred embodiment, a single or multiple working fluids can be confined within the inner cavity of the housing. During the liquid flow cavitation operation, the multiple working fluids interact with each other to enhance the cavitation effect. The multiple working fluids can be spherical, cylindrical, conical, annular, or a combination thereof.

[0078] Furthermore, the housing cavity of the liquid flow cavitation device provided by the present invention may include multiple compartments. These compartments may be separated along the liquid flow direction by a through-wall formed by an inwardly protruding inner wall of the housing. Each compartment houses multiple working fluids in groups. This allows only working fluids within the same group to collide with each other, accelerating the cavitation effect along the liquid flow direction.

[0079] During actual use, the liquid flow cavitation device provided by the present invention utilizes the vibration waves generated by the excited resonant tail and the sound waves radiated into the surrounding liquid to enhance the cavitation effect of the device. Furthermore, the vibration waves and sound waves generated by the resonant tail can be further utilized to resonate with the device's self-excited oscillation and cavitation energy. This resonance effect, in turn, acts on the cavitation device, further enhancing the self-excited oscillation of the cavitation device and the energy waves generated by cavitation. This allows for better utilization of the cavitation device's transformation effect on underground rock formations, improving reservoir permeability and recovery efficiency.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A liquid flow cavitation device, characterized in that: The cavitation device comprises: a housing having a top opening and a bottom opening; A freely movable working medium is confined in the inner cavity of the shell, and a flow channel for liquid flow is provided between the working medium and the inner cavity wall of the shell; The cavitation device further comprises a resonance tail wing located on the shell and extending out of the bottom opening end surface of the shell in the axial direction of the cavitation device; The cavitation device includes a plurality of resonance tail fins uniformly arranged along the circumferential direction of the shell; a spacing space is left between the side walls of two adjacent resonance tail fins; The inner wall surface of the resonance tail wing is a curved surface or a flat surface.

2. The liquid flow cavitation device according to claim 1, characterized in that: The resonance tail wing and the shell are an integrated structure, and the resonance tail wing extends from the edge of the bottom opening of the shell along the axial direction of the cavitation device.

3. The liquid flow cavitation device according to claim 1, characterized in that The resonant tail and the housing are separate structures; the cavitation device includes a resonant component, and the resonant component includes: an annular fixing portion connected and fixed to the bottom of the shell, and a vibrating portion located on the fixing portion and uniformly arranged along the circumferential direction of the fixing portion, the vibrating portion extending along the axial direction of the fixing portion; The vibrating portion of the resonant member forms a resonant tail wing of the cavitation device.

4. The liquid flow cavitation device according to claim 1, characterized in that The distance between the side walls of two adjacent resonance tail fins is not less than one third of the width of the resonance tail fin and not more than twice the width of the resonance tail fin.

5. The liquid flow cavitation device according to claim 1, characterized in that: The outer wall surface of the resonance tail wing is a cambered surface.

6. The liquid flow cavitation device according to claim 1, characterized in that: The thickness of the resonance tail wing in the radial direction decreases gradually from the end of the resonance tail wing close to the bottom opening of the shell to the end of the resonance tail wing far from the bottom opening of the shell.

7. The liquid flow cavitation device according to claim 1, characterized in that: In the axial direction of the cavitation device, the length of the resonance tail wing is not greater than 45% of the length of the shell.

8. The liquid flow cavitation device according to claim 1, characterized in that: The cavitation device includes a plurality of upper baffles adjacent to the top opening of the shell, and a lower baffle adjacent to the bottom opening of the shell; The upper baffles are formed by the inner cavity wall of the shell protruding inwardly, and are used to prevent the working medium from escaping from the shell through the top opening of the shell; The lower baffle protrudes inward from the inner cavity wall of the shell to prevent the working medium from escaping from the shell through the bottom opening of the shell; The bottom surface of the upper partition is a plane, an angle is formed between the axis of the upper partition and the axis of the cavitation device, and two adjacent upper partitions are arranged in parallel.

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