High-efficiency Coalbed Methane Fracturing Coal Dust Prevention Device

Abstract

The present invention relates to the technical field of coalbed methane fracturing exploitation, and particularly to an efficient coalbed methane fracturing anti-coal powder device. Its technical solution includes: a connecting pipeline assembly, on one side of which an ultrasonic generator is provided. The connecting pipeline assembly includes an internal connecting pipe, and an external connecting pipe is inserted outside the internal connecting pipe. After the ultrasonic generator of the present invention is activated, it generates high-frequency vibration, causing the gas in the fracturing fluid to form numerous stable microbubbles. When the fracturing fluid carrying microbubbles contacts the coal seam underground along the transmission pipeline, the bubbles quickly attach to the surface of the loose coal powder and lift it to the top area by means of buoyancy, avoiding settlement and mixing into the main flow path.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam gas fracturing exploitation, and particularly to an efficient coal seam gas fracturing coal powder prevention device. Background Art

[0002] Currently, during the fracturing exploitation of coal seam gas, there is a common phenomenon of a large amount of coal powder being generated, which not only seriously affects the exploitation efficiency but also brings great potential safety hazards. Existing treatment measures mostly focus on the post-treatment stage and lack effective source control technologies, so that the coal powder still has an adverse impact on production and the environment.

[0003] Currently, several common technical means include: ① Using the traditional hydraulic fracturing method, by increasing the volume of fracturing fluid to dilute the coal powder concentration. Although this method can alleviate the impact of coal powder to a certain extent, it will increase water resource consumption and the difficulty of post-treatment; ② Placing a physical isolation net or a filter device in the wellbore to intercept larger particles of coal powder. However, this method has limited blocking effect on fine coal powder, and long-term operation will cause blockage and requires frequent cleaning; ③ Applying chemical flocculants to promote the agglomeration and precipitation of coal powder. However, the use of chemical reagents may cause new environmental pollution problems and is costly. These three methods attempt to alleviate the coal powder problem from different perspectives, but each has obvious limitations.

[0004] Generally speaking, traditional methods mostly focus on post-treatment or simply preventing the spread of coal powder, lacking an active prevention mechanism, and cannot fundamentally solve the problem, resulting in low operation efficiency, serious environmental pollution, and difficulty in ensuring the safety of operators.

[0005] Therefore, the present application proposes an efficient coal seam gas fracturing coal powder prevention device. Summary of the Invention

[0006] The object of the present invention is to propose an efficient coal seam gas fracturing coal powder prevention device for the problems in the background art that traditional methods mostly focus on post-treatment or simply preventing the spread of coal powder, lacking an active prevention mechanism, resulting in low operation efficiency and serious environmental pollution.

[0007] The technical solution of the present invention: An efficient coal seam gas fracturing coal powder prevention device, including a connecting pipe assembly, on one side of the connecting pipe assembly is provided an ultrasonic generator, the connecting pipe assembly includes an internal connecting pipe, and an external connecting pipe is inserted outside the internal connecting pipe;

[0008] A detachable filtering component is installed inside the connecting pipe assembly, the detachable filtering component includes a microbubble injection system, and the ultrasonic generator is electrically connected to the microbubble injection system;

[0009] Inside the connecting pipe assembly, a first positioning and filtering component with an automatic cleaning function and an auxiliary adjustment component with an automatic cleaning function are installed. On the other side of the connecting pipe assembly, an intelligent monitoring system is provided. The intelligent monitoring system includes a plurality of high-precision sensor components, and the plurality of high-precision sensor components are distributed around the well wall for collecting environmental parameters such as pressure, temperature, and humidity.

[0010] Optionally, the detachable filtering component further includes a plurality of protective openings formed on the inner wall of the built-in connecting pipe, and a telescopic wall is fixedly installed inside the protective openings;

[0011] The first positioning and filtering component includes a first positioning and filtering plate slidably installed inside the protective opening, and a first filter element is fixedly installed on one side of the auxiliary filtering plate.

[0012] Optionally, the auxiliary adjustment component includes a second positioning and filtering component slidably installed inside the protective opening. The telescopic wall is fixedly installed on the upper and lower sides of the first positioning and filtering plate and the second positioning and filtering component. Electric telescopic rods are fixedly installed on the sides of the second positioning and filtering component and the first positioning and filtering plate that pass through the telescopic wall. The electric telescopic rods are fixedly installed on the inner wall of the built-in connecting pipe, and a positioning rod is installed inside the second positioning and filtering component.

[0013] Optionally, a microbubble injection pipe is fixedly installed on the outer side of the built-in connecting pipe. A control valve rod is slidably installed on the outer side of the microbubble injection pipe. A first spring is fixedly installed between the control valve rod and the microbubble injection pipe. A sliding rod is fixedly installed on one side of the control valve rod, and the side of the sliding rod away from the microbubble injection pipe is fixedly installed on the outer side of the electric telescopic rod. The microbubble injection pipe is connected to the microbubble injection system.

[0014] Optionally, the first positioning and filtering component further includes an auxiliary filtering plate rotatably installed at the bottom of the first positioning and filtering plate. A first filter element is fixedly installed on one side of the auxiliary filtering plate. A plurality of horizontal sliding rails are formed on the outer side of the first positioning and filtering plate, and a plurality of arc-shaped tracks are formed on the outer side of the auxiliary filtering plate. Auxiliary sliding columns are slidably installed inside the auxiliary filtering plate and the arc-shaped tracks. An auxiliary connecting long rod is fixedly installed on the side of the auxiliary sliding column passing through the auxiliary filtering plate. A second telescopic cleaning ring is fixedly installed on one side of the auxiliary connecting long rod, and a first telescopic cleaning ring is fixedly installed on the other side of the auxiliary connecting long rod.

[0015] Optionally, an external threaded pipe is fixedly installed on the side of the auxiliary filtering plate away from the first positioning and filtering plate. The external threaded pipe is rotatably installed on the inner wall of the built-in connecting pipe, and a guiding ball block is fixedly installed on the inner wall of the built-in connecting pipe. The guiding ball block is slidably installed inside the thread of the external threaded pipe.

[0016] Optionally, a second filter element is fixedly installed on one side of the second positioning and filtering component. A cleaning rack is arranged on the inner wall of the second positioning and filtering component, and the cleaning rack is attached to the second filter element.

[0017] Optionally, a pressure sensing component is installed on one side of the second positioning and filtering component. A leveling rack is fixedly installed on the outside of the pressure sensing component. A second spring is fixedly installed inside the pressure sensing component, and a telescopic rod is fixedly installed on one side of the second spring.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. After the ultrasonic generator is activated, it generates high-frequency vibrations, causing the gas in the fracturing fluid to form numerous stable micro-bubbles. When the fracturing fluid carrying micro-bubbles contacts the underground coal seam along the transmission pipeline, the bubbles quickly attach to the surface of the loose coal powder and lift it to the top area by buoyancy, avoiding settlement and mixing into the main flow path;

[0020] 2. As the auxiliary sliding column rotates along the arc track, the auxiliary sliding column performs a sliding movement under the guidance of the transverse sliding rail. The auxiliary sliding column drives the first telescopic cleaning ring and the second telescopic cleaning ring to move outward through the auxiliary connecting long rod. During the outward movement of the first telescopic cleaning ring and the second telescopic cleaning ring, the first telescopic cleaning ring and the second telescopic cleaning ring expand outward through their telescopic properties to scrape and clean the surface of the first filter element, avoiding clogging of the filtering component and extending the service life of the filter element;

[0021] 3. As the second positioning and filtering component moves downward, the leveling rack rotates following the positioning rod, stirring and pushing the fracturing fluid to various positions of the underground coal seam wall below, improving the anti-coal powder effect. At the same time, when contacting the fracturing fluid, it vibrates using the second spring to shake off the coal powder or fracturing fluid on the surface, and uses the pressure of the telescopic rod to understand whether the fracturing fluid is ejected normally, improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the coal seam gas fracturing anti-coal powder device of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the first positioning filter plate of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the first positioning and filtering component of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the first telescopic cleaning ring of the present invention

[0026] Figure 5 It is a schematic structural diagram of the external threaded pipe of the present invention

[0027] Figure 6 Structural schematic diagram of the leveling frame of the present invention

[0028] Figure 7 For the present invention Figure 6 Enlarged view of area A in the present invention

[0029] Figure 8 For the present invention Figure 6 Enlarged view of area B in the present invention.

[0030] Reference numerals: 1, connecting pipe assembly; 101, external connecting pipe; 102, internal connecting pipe; 2, detachable filtering assembly; 201, first spring; 202, protection port; 203, telescopic wall; 204, microbubble injection system; 205, electric telescopic rod; 206, sliding rod; 207, control valve rod; 208, microbubble injection pipe; 3, first positioning filtering assembly; 301, first positioning filter plate; 302, horizontal slide rail; 303, auxiliary filter plate; 304, arc track; 305, auxiliary sliding column; 306, positioning rod; 307, external threaded pipe; 308, first telescopic cleaning ring; 309, second telescopic cleaning ring; 310, auxiliary connecting long rod; 311, guiding ball block; 4, auxiliary adjustment assembly; 401, second positioning filtering assembly; 402, cleaning frame; 403, leveling frame; 404, second spring; 405, telescopic rod; 406, pressure sensing assembly. Detailed implementation manners

[0031] The technical solutions of the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0033] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "back end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] The high-efficiency coal-bed methane fracturing anti-coal dust device proposed by the present invention includes a connecting pipeline assembly 1. On one side of the connecting pipeline assembly 1, an ultrasonic generator is provided. The connecting pipeline assembly 1 includes an internal connecting pipe 102, and an external connecting pipe 101 is inserted outside the internal connecting pipe 102. A detachable filtering assembly 2 is installed inside the connecting pipeline assembly 1. The detachable filtering assembly 2 includes a microbubble injection system 204. The ultrasonic generator is electrically connected to the microbubble injection system 204. Inside the internal connecting pipe 102, a transmission pipeline for connecting the surface station and the downhole equipment is provided. The ultrasonic generator is installed on the ground and is connected to the transmission pipeline. The microbubble injection system 204 adopts an electric shut-off valve, which is in an open state when fracturing fluid is introduced and in a closed state when not in use, to prevent coal dust from entering the interior of the equipment.

[0037] A first positioning filtering assembly 3 with an automatic cleaning function and an auxiliary adjustment assembly 4 with an automatic cleaning function are installed inside the connecting pipeline assembly 1. On the other side of the connecting pipeline assembly 1, an intelligent monitoring system is provided. The intelligent monitoring system includes a plurality of high-precision sensor assemblies. The plurality of high-precision sensor assemblies are distributed around the wellbore for collecting environmental parameters such as pressure, temperature, and humidity. Refer to Figure 1 and Figure 6 , first, after the ultrasonic generator is activated, it generates high-frequency vibrations, causing the gas in the fracturing fluid to form numerous stable microbubbles. When the fracturing fluid carrying microbubbles contacts the coal seam underground along the transmission pipeline, the bubbles quickly adhere to the surface of the loose coal dust and lift it to the top area by buoyancy, avoiding sedimentation and mixing into the main flow path.

[0038] Meanwhile, the intelligent monitoring system continuously collects the changes in various parameters. When abnormal signals are detected, it will trigger preset logical judgments, such as increasing the bubble production or slowing down the fracturing speed, etc., to keep the overall process stable. The first positioning and filtering component 3 and the auxiliary adjustment component 4, as the last line of defense, further purify the mixed fluid flowing back to the upper part, remove the residual coal dust, and prevent them from interfering with the work of subsequent links. Moreover, the first positioning and filtering component 3 and the auxiliary adjustment component 4 are detachable. During later recycling, they can be cleaned and replaced. By accessing the real-time information of the high-precision sensor component through the terminal, remote managers can also understand the latest progress in real time and make corresponding decisions in a timely manner.

[0039] The detachable filter component 2 further includes a plurality of protective openings 202 formed on the inner wall of the built-in connecting pipe 102, and a telescopic wall 203 is fixedly installed inside the protective opening 202;

[0040] The first positioning and filtering component 3 includes a first positioning and filtering plate 301 slidably installed inside the protective opening 202. A first filter element is fixedly installed on one side of the auxiliary filter plate 303. The auxiliary adjustment component 4 includes a second positioning and filtering component 401 slidably installed inside the protective opening 202. The telescopic wall 203 is fixedly installed on the upper and lower sides of the first positioning and filtering plate 301 and the second positioning and filtering component 401. The second positioning and filtering component 401 includes the same mechanism as the first positioning and filtering plate 301, the auxiliary filter plate 303, and the auxiliary sliding column 305. Both the second positioning and filtering component 401 and the side of the first positioning and filtering plate 301 passing through the telescopic wall 203 are fixedly installed with electric telescopic rods 205. The electric telescopic rods 205 are fixedly installed on the inner wall of the built-in connecting pipe 102. A positioning rod 306 is installed inside the second positioning and filtering component 401. Refer to Figure 2 and Figure 7 , when it is necessary to clean the first positioning and filtering plate 301 and the second positioning and filtering component 401, the telescopic ends of the electric telescopic rods 205 drive the first positioning and filtering plate 301 and the second positioning and filtering component 401 to slide up and down along the protective opening 202. During this process, since the telescopic wall 203 has telescopic movement, as the first positioning and filtering plate 301 and the second positioning and filtering component 401 slide, the protective opening 202 is always in a sealed state, preventing coal powder from entering the equipment interior;

[0041] A microbubble injection pipe 208 is fixedly installed on the outer side of the built-in connecting pipe 102. A control valve rod 207 is slidably installed on the outer side of the microbubble injection pipe 208. A first spring 201 is fixedly installed between the control valve rod 207 and the microbubble injection pipe 208. A sliding rod 206 is fixedly installed on one side of the control valve rod 207. The side of the sliding rod 206 away from the microbubble injection pipe 208 is fixedly installed on the outer side of the electric telescopic rod 205. The microbubble injection pipe 208 is connected to the microbubble injection system 204. Refer toFigure 2 - Figure 5 When the second positioning and filtering component 401 and the first positioning and filtering plate 301 move upward, they are away from the spraying position of the microbubble injection system 204. At this time, the telescopic end of the electric telescopic rod 205 drives the control valve rod 207 to move upward along the microbubble injection pipe 208 through the sliding rod 206. At this time, the single spraying amount is increased to facilitate the injection of the fracturing fluid. When the second positioning and filtering component 401 and the first positioning and filtering plate 301 move downward, it is convenient for the scraping frame 403 to contact the fracturing fluid for stirring and spreading.

[0042] Such as Figure 1 and Figure 3 shown, the first positioning and filtering component 3 further includes an auxiliary filtering plate 303 rotatably installed at the bottom of the first positioning and filtering plate 301. A plurality of transverse slide rails 302 are provided on the outer side of the first positioning and filtering plate 301. A plurality of arc-shaped tracks 304 are provided on the outer side of the auxiliary filtering plate 303. An auxiliary sliding column 305 is slidably installed inside the auxiliary filtering plate 303 and the arc-shaped track 304. One side of the auxiliary sliding column 305 passing through the auxiliary filtering plate 303 is fixedly installed with an auxiliary connecting long rod 310. One side of the auxiliary connecting long rod 310 is fixedly installed with a second telescopic cleaning ring 309. The other side of the auxiliary connecting long rod 310 is fixedly installed with a first telescopic cleaning ring 308. One side of the auxiliary filtering plate 303 away from the first positioning and filtering plate 301 is fixedly installed with an external threaded pipe 307. The external threaded pipe 307 is rotatably installed on the inner wall of the internal connecting pipe 102. A guiding ball block 311 is fixedly installed on the inner wall of the internal connecting pipe 102. The guiding ball block 311 is slidably installed in the thread of the external threaded pipe 307. Refer to Figure 5When the external threaded pipe 307 is subjected to the upward pulling force of the first positioning filter plate 301, since the threads on the surface of the external threaded pipe 307 come into contact with the guide ball block 311 and the guide ball block 311 is fixedly arranged, the auxiliary filter plate 303, the first positioning filter plate 301, the external filter net and the second positioning filter assembly 401 adopt ceramic filter elements, while the external threaded pipe 307 adopts a stainless steel material frame and is relatively light in overall texture. When the external threaded pipe 307 rises, the threads on its outer side generate a rotational force under the contact pressure of the guide ball block 311, so the external threaded pipe 307 rotates correspondingly along the bottom of the first positioning filter plate 301 through the auxiliary filter plate 303. The external threaded pipe 307 drives the auxiliary filter plate 303 to rotate. Since the auxiliary sliding column 305 is limited by the arc track 304 and the horizontal sliding rail 302, as the auxiliary sliding column 305 rotates along the arc track 304, the auxiliary sliding column 305 slides under the guidance of the horizontal sliding rail 302. The auxiliary sliding column 305 drives the first telescopic cleaning ring 308 and the second telescopic cleaning ring 309 to move outwards through the auxiliary connecting long rod 310. During the process of the first telescopic cleaning ring 308 and the second telescopic cleaning ring 309 moving outwards, the first telescopic cleaning ring 308 and the second telescopic cleaning ring 309 expand outwards through their telescopic properties to scrape and clean the surface of the first filter element, avoiding blocking the filter assembly and prolonging the service life of the filter element.

[0043] Due to the protection of the second filter element, the pulverized coal particles covering the first filter element are smaller and are relatively easy to be removed.

[0044] Secondly, a second filter element is fixedly installed on one side of the second positioning filter assembly 401. The first filter element and the second filter element are a complete filter net assembly without gaps. A cleaning frame 402 is arranged on the inner wall of the second positioning filter assembly 401 and the cleaning frame 402 is attached to the second filter element. Refer to Figure 3 When the second positioning filter assembly 401 moves up and down synchronously, its rotatable surface rotates along the positioned surface, and its rotating surface drives the cleaning frame 402 to scrape along the second filter element through the positioning rod 306. Since the second filter element is close to the underground coal seam and the fracturing fluid injection layer, more pulverized coal covers its surface. Therefore, the cleaning frame 402 with better cleaning effect is used for work, and in cooperation with the up and down movement of the electric telescopic rod 205, the cleaning is carried out at a place relatively far from the microbubble injection system 204 to prevent interference with the injection of the fracturing fluid. A pressure sensing component 406 is installed on one side of the second positioning filter assembly 401. A scraping flat frame 403 is fixedly installed on the outside of the pressure sensing component 406. A second spring 404 is fixedly installed inside the pressure sensing component 406. One side of the second spring 404 is fixedly installed with a telescopic rod 405. Refer to Figure 8, as the second positioning and filtering component 401 moves downward, the leveling frame 403 rotates following the positioning rod 306, pushing and stirring the fracturing fluid to various positions of the underground coal seam wall below, improving the effect of preventing coal powder. At the same time, when in contact with the fracturing fluid, it vibrates by using the second spring 404 to shake off the coal powder or fracturing fluid on the surface, and uses the pressure of the telescopic rod 405 to understand whether the fracturing fluid is ejected normally, improving the stability of the device.

[0045] In this embodiment, the design concept of the high-efficiency coalbed methane fracturing coal powder prevention device is to integrate advanced microbubble technology and an intelligent control system to construct a complete coal powder management plan. It injects a large number of tiny bubbles into the fracturing fluid, and these bubbles can efficiently adsorb coal powder, reducing the possibility of it entering the production pipeline. At the same time, by arranging a highly sensitive sensor network to monitor the changes in the underground environment in real time, once an abnormality is detected, it can respond quickly, adjust the microbubble generation amount or the fracturing fluid flow rate to ensure the stability and safety of the underground operation environment. The designed detachable auxiliary adjustment component 4 and the first positioning and filtering component 3 are located near the wellhead, specifically used to capture a small amount of coal powder not completely absorbed by the microbubbles, and are equipped with a self-cleaning function to ensure the continuous and efficient operation of the system.

[0046] In addition, the present invention can also use a biodegradable foaming agent to replace air as the core component of the bubbles, which can not only enhance the adsorption effect but also reduce the ecological burden. Additionally, for mining areas with special coal powder characteristics under certain geological conditions, the adaptability of different types of microbubble systems can be pre-tested by simulating the actual environment in the laboratory, so as to select the best configuration.

[0047] The above specific embodiments are only the preferred embodiments of the present application. Based on the technical solutions of the present application and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments; the above specific embodiments are only explanations of the present application and are not limitations to the present application.

Claims

1. High-efficiency coalbed methane fracturing anti-coal dust device, including a connecting pipe assembly (1), characterized in that: One side of the connecting pipe assembly (1) is provided with an ultrasonic generator. The connecting pipe assembly (1) includes an internal connecting pipe (102), and an external connecting pipe (101) is inserted outside the internal connecting pipe (102); A detachable filter assembly (2) is installed inside the connecting pipe assembly (1). The detachable filter assembly (2) includes a microbubble injection system (204), and the ultrasonic generator is electrically connected to the microbubble injection system (204); A first positioning filter assembly (3) with an automatic cleaning function and an auxiliary adjustment assembly (4) with an automatic cleaning function are installed inside the connecting pipe assembly (1). An intelligent monitoring system is provided on the other side of the connecting pipe assembly (1). The intelligent monitoring system includes a plurality of high-precision sensor components, and the plurality of high-precision sensor components are distributed around the well wall for collecting environmental parameters such as pressure, temperature, and humidity; The detachable filter assembly (2) further includes a plurality of protective openings (202) opened on the inner wall of the internal connecting pipe (102), and a telescopic wall (203) is fixedly installed inside the protective openings (202); The first positioning filter assembly (3) includes a first positioning filter plate (301) slidably installed inside the protective opening (202); The auxiliary adjustment assembly (4) includes a second positioning filter assembly (401) slidably installed inside the protective opening (202). The telescopic wall (203) is fixedly installed on the upper and lower sides of the first positioning filter plate (301) and the second positioning filter assembly (401). Electric telescopic rods (205) are fixedly installed on one side of the second positioning filter assembly (401) and the first positioning filter plate (301) passing through the telescopic wall (203). The electric telescopic rods (205) are fixedly installed on the inner wall of the internal connecting pipe (102), and a positioning rod (306) is installed inside the second positioning filter assembly (401); The first positioning filter assembly (3) further includes an auxiliary filter plate (303) rotatably installed at the bottom of the first positioning filter plate (301). A first filter element is fixedly installed on one side of the auxiliary filter plate (303). A plurality of horizontal slide rails (302) are opened on the outside of the first positioning filter plate (301). A plurality of arc-shaped tracks (304) are opened on the outside of the auxiliary filter plate (303). An auxiliary sliding column (305) is slidably installed inside the auxiliary filter plate (303) and the arc-shaped track (304). An auxiliary connecting long rod (310) is fixedly installed on one side of the auxiliary sliding column (305) passing through the auxiliary filter plate (303). A second telescopic cleaning ring (309) is fixedly installed on one side of the auxiliary connecting long rod (310). A first telescopic cleaning ring (308) is fixedly installed on the other side of the auxiliary connecting long rod (310); One side of the auxiliary filter plate (303) away from the first positioning filter plate (301) is fixedly installed with an external threaded pipe (307). The external threaded pipe (307) is rotatably installed on the inner wall of the internal connecting pipe (102). A guiding ball block (311) is fixedly installed on the inner wall of the internal connecting pipe (102), and the guiding ball block (311) is slidably installed in the thread of the external threaded pipe (307). One side of the second positioning filter assembly (401) is fixedly installed with a second filter element. A cleaning frame (402) is arranged on the inner wall of the second positioning filter assembly (401), and the cleaning frame (402) is attached to the second filter element.

2. The high-efficiency coalbed methane fracturing anti-coal powder device according to claim 1, characterized in that, An air microbubble injection pipe (208) is fixedly installed on the outer side of the internal connecting pipe (102). A control valve rod (207) is slidably installed on the outer side of the air microbubble injection pipe (208). A first spring (201) is fixedly installed between the control valve rod (207) and the air microbubble injection pipe (208). A sliding rod (206) is fixedly installed on one side of the control valve rod (207). The side of the sliding rod (206) away from the air microbubble injection pipe (208) is fixedly installed on the outer side of the electric telescopic rod (205). The air microbubble injection pipe (208) is connected to the air microbubble injection system (204).

3. The high-efficiency coalbed methane fracturing anti-coal powder device according to claim 2, wherein, A pressure sensing assembly (406) is installed on one side of the second positioning filter assembly (401). A leveling frame (403) is fixedly installed on the outer side of the pressure sensing assembly (406). A second spring (404) is fixedly installed inside the pressure sensing assembly (406). A telescopic rod (405) is fixedly installed on one side of the second spring (404).

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