Screen pipe cleaning device for coal-bed gas well

Abstract

The invention relates to the technical field of screen pipe cleaning, and discloses a screen pipe cleaning device for a coal-bed gas well, which adopts a split mounting structure, is convenient to disassemble, assemble and maintain, adopts a working structure that end part washing is matched with plugging middle section cleaning, and utilizes a conical cleaning head arranged at the lower end of a cleaning liquid guide column to wash and clean the inner wall of a screen pipe. And for a heavily-blocked section, the inner section of the screen pipe can be blocked and isolated through water filling expansion of water filling bag seats on the upper side and the lower side of a cleaning liquid guide column, blocked dirt in a hole of the heavily-blocked section can be effectively removed in cooperation with water injection flushing of a cleaning spray head, and the cleaning operation of the screen pipe can be efficiently completed through double cooperation. The conical cleaning head is arranged in a conical seat structure, water liquid is guided through a conical flow guide seat to form conical cleaning water liquid, and an opening of the conical cleaning head is downwards matched with the conical high-pressure water liquid to wash and clean the inner wall of the screen pipe in a 360-degree dead-angle-free mode.

Description

Technical Field

[0001] The invention relates to the technical field of screen pipe cleaning, in particular to a screen pipe cleaning device for a coalbed methane well. Background Art

[0002] Coalbed methane refers to hydrocarbon gas stored in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, and partially free in coal pores or dissolved in coal seam water. It is a mineral resource associated with coal and an unconventional natural gas. It is a clean, high-quality energy and chemical raw material that has emerged internationally in the past 10 to 20 years. Coalbed methane can be used as civil fuel, industrial fuel, power generation fuel, automobile fuel and important chemical raw material, and has a wide range of uses. In the process of oil and gas well completion, it is necessary to lower the pipe string into the well to transport oil and gas from the underground strata to the ground. Sanding of the oil layer is a common problem in the exploitation of loose sandstone reservoirs. Sanding of the oil layer not only affects the collection quality, but also blocks the collection pipeline. To address this problem, conventional oil wells currently use sand-proof screens. Since the screen is inside the soil layer, after working for a period of time, mud, debris and other debris are prone to blockage in the holes of the screen, resulting in a significant reduction in the permeability of the screen. In order to ensure the normal operation of the screen, the screen cleaning device needs to be used to clean and maintain the screen.

[0003] Existing screen cleaning devices mostly adopt a high-pressure flushing cleaning method inside the pipe, in which the inner wall of the pipe body is flushed and cleaned from the inside of the screen by high-pressure water. Since the blockages are concentrated in the holes of the screen, for the pipe section with serious blockage during the cleaning process, it is difficult to effectively clean the dirt in the holes by relying solely on internal flushing, and the cleaning effect is not good. Therefore, a screen cleaning device for coalbed methane wells is proposed. Summary of the invention

[0004] The object of the present invention is to provide a screen cleaning device for a coalbed methane well to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A screen cleaning device for a coalbed methane well, comprising: a cleaning liquid guide column, a cleaning sleeve, a water-filled bag seat, a conical cleaning head and a connecting end seat;

[0006] The cleaning sleeve is in the shape of a sleeve seat, and is installed in the middle of the end rod of the cleaning liquid guide column. A cleaning nozzle is arranged on the outer peripheral side of the cleaning sleeve;

[0007] The water-filled bladder seats are arranged in pairs, and the two groups of water-filled bladder seats are respectively installed on the upper and lower end column sides of the cleaning liquid-guiding column;

[0008] The conical cleaning head is in the shape of a conical seat, and is installed in an inverted manner at the lower end of the cleaning liquid guide column, and a conical guide seat is provided in the middle of the conical cleaning head;

[0009] The upper part of the cleaning liquid guide column is provided with a sleeve water supply end pipe, a bag seat water supply end pipe and a cleaning head water supply end pipe which are respectively connected with the cleaning sleeve, the water filling bag seat and the conical cleaning head. The connecting end seat is fastened to the upper end of the cleaning liquid guide column, and a rotating disc seat is provided in the middle of the connecting end seat.

[0010] Preferably, the cleaning liquid guiding column is in the shape of a rod column, and the sleeve water supply end tube, the bag seat water supply end tube and the cleaning head water supply end tube are evenly fixedly installed in a circle on the upper end of the cleaning liquid guiding column.

[0011] Preferably, the upper end of the cleaning liquid guide column is provided with an external thread, the connecting end seat is fixedly installed with the upper end of the cleaning liquid guide column by threaded fastening, the rotating disk seat is rotatably engaged and installed in the middle part of the connecting end seat, and the upper part of the rotating disk seat is penetrated by an end tube mounting hole.

[0012] Preferably, the above-mentioned end tube mounting holes correspond to the distribution positions of the sleeve water supply end tube, the bag seat water supply end tube and the cleaning head water supply end tube, and the end tube mounting holes and the upper ends of the sleeve water supply end tube and the bag seat water supply end tube are all inserted and installed in the corresponding end tube mounting holes, and the end tube mounting holes and the sleeve water supply end tube and the bag seat water supply end tube are connected and installed with the externally arranged water supply pipe through the threaded structure arranged at the end.

[0013] Preferably, the cleaning sleeve fixed sleeve is installed in the middle of the end rod of the cleaning liquid guiding column, and a water supply opening is provided in the middle of the end rod of the cleaning liquid guiding column, and the water supply opening is connected to the water supply end pipe of the sleeve.

[0014] Preferably, the above-mentioned cleaning nozzles are provided in plurality, and a plurality of the cleaning nozzles are evenly installed in a circular shape on the outer peripheral side of the cleaning sleeve.

[0015] Preferably, the two groups of the above-mentioned water-filled bladder seats are fixedly mounted on the upper and lower end column parts of the cleaning liquid guide column through cylinder seats. The water-filled bladder seats are ring-shaped devices, which are connected to the water supply end pipe of the bladder seat. During mid-section cleaning, the water-filled bladder seats are installed by expanding to contact the inner wall of the screen tube.

[0016] Preferably, a threaded interface is provided in the middle of the lower end of the above-mentioned cleaning liquid guide column, and a threaded butt joint is fixed to the upper part of the conical cleaning head. The threaded butt joint is threadedly fastened to the threaded interface, and the threaded interface is connected to the water supply end pipe of the cleaning head.

[0017] Preferably, the conical guide seat is in the shape of a cone seat, a guide block is fixed to the middle of the conical guide seat, and the upper part of the guide block is in the shape of a spherical surface.

[0018] Preferably, the guide protrusion is fixedly mounted on the conical cleaning head via an inner support, and after installation, the conical cleaning head and the outside of the conical guide seat form an annular cleaning nozzle.

[0019] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0020] 1. The cleaning device adopts a columnar structure. The overall columnar shape of the device can easily enter the interior of the screen tube, is easy to install and use, and adopts a split installation structure. The cleaning sleeve and the conical cleaning head can be detachably installed on the upper part of the cleaning liquid guide column, which is convenient for disassembly and maintenance.

[0021] 2. The working structure of end flushing and plugging mid-section cleaning is adopted. The conical cleaning head arranged at the lower end of the cleaning guide column is used to flush and clean the inner wall of the screen tube. For the heavily blocked section, the water-filled expansion of the water-filled bag seats on the upper and lower sides of the cleaning guide column can block and isolate the inner section of the screen tube. The water injection and flushing of the cleaning nozzle can effectively remove the blocked dirt in the holes of the heavily blocked section. The double coordination can efficiently complete the cleaning operation of the screen tube, and the working mode can be selected according to the blockage situation, which greatly improves the flexibility of the device.

[0022] 3. The conical cleaning head adopts a conical seat structure. The conical guide seat can be used to guide the water to form a conical cleaning water. The conical cleaning head opens downward and the conical high-pressure water can be used to clean the inner wall of the screen tube 360 ​​degrees without dead ends. The high efficiency of flushing can effectively improve the cleaning effect of the screen tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the upper three-dimensional structure of the overall installation of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall installation bottom three-dimensional structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the installation structure of the cleaning sleeve and the cleaning liquid guide column of the present invention;

[0027] Figure 4 This is a schematic diagram of the installation structure of the connection terminal seat of the present invention;

[0028] Figure 5It is a schematic diagram of the installation structure of the conical cleaning head of the present invention;

[0029] Figure 6 It is a schematic diagram of the internal structure of the conical cleaning head of the present invention;

[0030] Figure 7 It is a schematic diagram of the working installation structure of the present invention and the screen pipe.

[0031] Explanation of the accompanying drawings: 1. Cleaning liquid guide column; 2. Cleaning sleeve; 3. Water-filled bladder seat; 4. Conical cleaning head; 5. Connecting end seat; 6. Sleeve water supply end pipe; 7. Bladder seat water supply end pipe; 8. Cleaning head water supply end pipe; 9. Rotating disk seat; 10. End pipe mounting hole; 11. Cleaning nozzle; 12. Threaded joint; 13. Threaded interface; 14. Conical guide seat; 15. Guide bump. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0034] Example

[0035] See also Figure 1-7 , The present invention provides a technical solution: a screen cleaning device for a coalbed methane well, comprising: a cleaning liquid guide column 1, a cleaning sleeve 2, a water-filled bag seat 3, a conical cleaning head 4 and a connecting end seat 5, specifically;

[0036] As attached Figure 1 As shown, the cleaning liquid guide column 1 is in the shape of a rod column, and the cleaning device adopts a columnar structure. The device as a whole is in the shape of a column, which can easily enter the interior of the screen tube, and is easy to install and use. In order to facilitate the water supply connection, as shown in the attached Figure 4As shown, a sleeve water supply end pipe 6, a bladder seat water supply end pipe 7 and a cleaning head water supply end pipe 8 are respectively arranged on the upper part of the cleaning liquid guiding column 1, which are connected and installed with the cleaning sleeve 2, the water-filled bladder seat 3 and the conical cleaning head 4. The sleeve water supply end pipe 6, the bladder seat water supply end pipe 7 and the cleaning head water supply end pipe 8 are evenly fixedly installed on the upper end of the cleaning liquid guiding column 1 in a circular shape. In order to facilitate the connection and installation of the connecting end seat 5, an external thread is arranged on the upper end of the cleaning liquid guiding column 1. The connecting end seat 5 is fixedly installed with the upper end of the cleaning liquid guiding column 1 by threaded fastening. In order to facilitate the coordinated installation with the water supply end pipe, a rotating disc seat 9 is arranged in the middle of the connecting end seat 5. The rotating disc seat 9 is rotatably fitted in the middle of the connecting end seat 5. The rotating disc seat 9 An end pipe mounting hole 10 is provided through the upper part, and the end pipe mounting hole 10 corresponds to the distribution positions of the sleeve water supply end pipe 6, the bag seat water supply end pipe 7 and the cleaning head water supply end pipe 8. The end pipe mounting hole 10 and the upper ends of the sleeve water supply end pipe 6 and the bag seat water supply end pipe 7 are all inserted and installed in the corresponding end pipe mounting hole 10. The end pipe mounting hole 10 and the sleeve water supply end pipe 6 and the bag seat water supply end pipe 7 are connected and installed with the external water supply pipe through the threaded structure arranged at the end. A traction connecting block is provided at the lower part of the water supply pipe. The lower part of the water supply pipe is fixedly installed with the traction connecting block and is connected and installed with the reinforced steel rope in a staggered spiral shape, forming a single-bundle lifting and traction structure, which can effectively improve the lifting and pulling stability of the device.

[0037] Cleaning sleeve 2 is used for cleaning the heavily blocked section of the screen pipe. Figure 3 As shown, the cleaning sleeve 2 is in the shape of a sleeve seat. The cleaning sleeve 2 is fixedly mounted in the middle of the end rod of the cleaning liquid guiding column 1. In order to facilitate flushing and cleaning, a cleaning nozzle 11 is arranged on the outer peripheral side of the cleaning sleeve 2. There are multiple cleaning nozzles 11, and several cleaning nozzles 11 are evenly installed in a circular shape on the outer peripheral side of the cleaning sleeve 2. In order to supply water to the cleaning sleeve 2, a water supply opening is arranged in the middle of the end rod of the cleaning liquid guiding column 1. The water supply opening is connected to the water supply end pipe 6 of the sleeve, and water can be transported into the interior of the cleaning sleeve 2.

[0038] The water-filled bladder seat 3 is made of rubber. Figure 1 As shown, the water-filling bladder seat 3 is arranged in pairs, and the two groups of water-filling bladder seats 3 are respectively fixedly mounted on the upper and lower end column parts of the cleaning liquid-guiding column 1 through the cylinder seat. The water-filling bladder seat 3 is a ring-shaped device, and the water-filling bladder seat 3 is connected to the bladder seat water supply end pipe 7, as shown in the attached Figure 7As shown, during the middle section cleaning, the water-filled bag seat 3 is installed in contact with the inner wall of the screen tube by expansion, and the working structure of the end flushing and plugging middle section cleaning is adopted. The conical cleaning head 4 arranged at the lower end of the cleaning liquid guide column 1 is used to flush and clean the inner wall of the screen tube, and for the heavily blocked section, the water-filled bag seat 3 on the upper and lower sides of the cleaning liquid guide column 1 can be expanded to block and isolate the inner section of the screen tube, and the water injection and flushing of the cleaning nozzle 11 can effectively remove the blocked dirt in the holes of the heavily blocked section. The double coordination can efficiently complete the cleaning operation of the screen tube, and the working mode can be selected according to the blockage situation, which greatly improves the flexibility of the device.

[0039] The conical cleaning head 4 is used for flushing and cleaning the inner wall of the screen tube. Figure 5 As shown, the conical cleaning head 4 is in the shape of a conical seat. In order to facilitate the connection and installation of the conical cleaning head 4, a threaded interface 13 is provided in the middle of the lower end of the cleaning liquid guiding column 1. A threaded joint 12 is fixed to the upper part of the conical cleaning head 4. The threaded joint 12 and the threaded interface 13 are threadedly fastened and installed. A split installation structure is adopted. The cleaning sleeve 2 and the conical cleaning head 4 can be detachably installed on the upper part of the cleaning liquid guiding column 1, which is convenient for disassembly and maintenance. The threaded interface 13 is connected to the water supply end pipe 8 of the cleaning head to realize the supply and transportation of water. In order to guide the water, as shown in the attached Figure 6 As shown, a conical guide seat 14 is arranged in the middle of the conical cleaning head 4, and the conical guide seat 14 is in the shape of a conical seat. In order to improve the diversion effect, a guide protrusion 15 is fixed in the middle of the conical guide seat 14, and the upper part of the guide protrusion 15 is spherical. While diverting the water, the flow resistance of the conical guide seat 14 to the water can be reduced. The conical cleaning head 4 is installed in an inverted state at the lower end of the cleaning guide column 1, and the guide protrusion 15 is fixedly installed with the conical cleaning head 4 through the inner support. After installation, the conical cleaning head 4 and the outside of the conical guide seat 14 form an annular cleaning nozzle. The conical cleaning head 4 adopts a conical seat structure. The conical guide seat 14 is used to guide the water to form a conical cleaning water. The conical cleaning head 4 opens downward and cooperates with the conical high-pressure water to perform 360-degree no-dead-angle flushing and cleaning of the inner wall of the screen tube. The efficient flushing can effectively improve the cleaning effect of the screen tube.

[0040] Working principle or structural principle, when in use, the connecting end seat 5 is installed on the upper end of the cleaning liquid guide column 1 so that the sleeve water supply end pipe 6 and the end pipe mounting hole 10 are plugged and installed in position, and then the connecting end seat 5 is tightened and installed by screwing. After completion, the three water supply pipes are respectively connected and installed with the three groups of water supply end pipes through the threaded end structure to complete the installation of the device. Then, the internal blockage of the screen tube is checked and marked by the internal inspection camera device. After completion, the device is placed in the interior of the screen tube in an upright state. At this time, the water-filled bag seat 3 is in a semi-filled state, which can provide auxiliary guidance for the lowering of the device. At the same time, the water supply end pipe 8 of the cleaning head carries out high-pressure water delivery. The high-pressure water enters the conical cleaning head 4 through the water supply end pipe 8 of the cleaning head. In the conical cleaning head 4, the water passes through the conical guide seat 14 and is sprayed out from the nozzle on the lower side of the conical cleaning head 4 at a high speed to form a conical water flow, and the dirt on the inner wall of the screen tube is washed and cleaned by the conical high-pressure water flow;

[0041] When the device reaches the severe blockage section, it stops lowering, and then the bag seat water supply end pipe 7 supplies water to the two groups of water-filled bag seats 3. After the two groups of water-filled bag seats 3 are filled with water, they are fully expanded to expand and block the upper and lower sides of the middle section of the screen tube to form a closed chamber structure. At the same time, the device can be temporarily positioned and supported by the expansion support of the water-filled bag seats 3, and then water is supplied to the cleaning sleeve 2 through the sleeve water supply end pipe 6. The water is sprayed out through the cleaning nozzle 11 on the upper part of the cleaning sleeve 2 to clean the inner wall of the screen tube and fill the cavity of the closed section with water. The internal pressure of the closed chamber is used to allow the water to be retained from the through hole of the screen tube, and the blocked through hole is dredged by reverse flushing. After the cleaning is completed, the water-filled bag seat 3 is depressurized. The water-filled bag seat 3 loses the water pressure support and shrinks and resets, so that the cleaning sewage is discharged and the inner wall of the screen tube is flushed and cleaned for the second time through the cleaning nozzle 11, completing the cleaning work of the severe blockage section. Then the device continues to be lowered to complete the screen tube cleaning work.

[0042] In summary, the cleaning device adopts a columnar structure. The device is columnar as a whole, which can easily enter the interior of the screen tube. It is easy to install and use, and adopts a split installation structure. The cleaning sleeve 2 and the conical cleaning head 4 can be detachably installed on the upper part of the cleaning liquid guide column 1. It is convenient to disassemble and maintain. The end flushing and plugging mid-section cleaning working structure are adopted. The conical cleaning head 4 arranged at the lower end of the cleaning liquid guide column 1 is used to flush and clean the inner wall of the screen tube. For the heavily blocked section, the inner section of the screen tube can be cleaned by expanding the water-filled bag seats 3 on the upper and lower sides of the cleaning liquid guide column 1. Plugging and isolation, combined with the water injection and flushing of the cleaning nozzle 11, can effectively remove the blocked dirt in the holes of the heavily blocked section. The double cooperation can efficiently complete the cleaning operation of the screen pipe, and the working mode can be selected according to the blockage situation, which greatly improves the flexibility of the device. The conical cleaning head 4 adopts a conical seat structure, and the conical guide seat 14 is used to guide the water to form a conical cleaning water liquid. The conical cleaning head 4 opens downward and cooperates with the conical high-pressure water liquid to perform 360-degree non-dead-angle flushing and cleaning of the inner wall of the screen pipe. The efficient flushing can effectively improve the cleaning effect of the screen pipe.

[0043] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. A screen cleaning device for a coalbed methane well, characterized in that: include: A cleaning liquid guide column (1), a cleaning sleeve (2), a water-filled bag seat (3), a conical cleaning head (4) and a connecting end seat (5); The cleaning sleeve (2) is in the shape of a sleeve seat, and is installed in the middle of the end rod of the cleaning liquid guide column (1). A cleaning nozzle (11) is arranged on the outer peripheral side of the cleaning sleeve (2); The water-filled bladder seats (3) are arranged in pairs, and two groups of the water-filled bladder seats (3) are respectively installed on the upper and lower end column sides of the cleaning liquid-guiding column (1); The conical cleaning head (4) is in the shape of a conical seat, and the conical cleaning head (4) is installed in an inverted manner at the lower end of the cleaning liquid guide column (1), and a conical guide seat (14) is provided in the middle of the conical cleaning head (4); The upper part of the cleaning liquid-conducting column (1) is provided with a sleeve water supply end pipe (6), a bladder seat water supply end pipe (7) and a cleaning head water supply end pipe (8) which are respectively connected and installed with the cleaning sleeve (2), the water-filled bladder seat (3) and the conical cleaning head (4); the connecting end seat (5) is fixedly installed on the upper end of the cleaning liquid-conducting column (1); and a rotating disc seat (9) is provided in the middle of the connecting end seat (5).

2. A screen cleaning device for a coalbed methane well according to claim 1, characterized in that: The cleaning liquid guide column (1) is in the shape of a rod column, and the sleeve water supply end pipe (6), the bag seat water supply end pipe (7) and the cleaning head water supply end pipe (8) are evenly and fixedly installed on the upper end of the cleaning liquid guide column (1) in a circular arrangement.

3. A screen cleaning device for a coalbed methane well according to claim 2, characterized in that: The upper end of the cleaning liquid guide column (1) is provided with an external thread, the connecting end seat (5) is fixedly mounted on the upper end of the cleaning liquid guide column (1) by threaded fastening, the rotating disc seat (9) is rotatably engaged and mounted on the middle part of the connecting end seat (5), and the upper part of the rotating disc seat (9) is penetrated by an end pipe mounting hole (10).

4. A screen cleaning device for a coalbed methane well according to claim 3, characterized in that: The end pipe mounting holes (10) correspond to the distribution positions of the sleeve water supply end pipe (6), the bag seat water supply end pipe (7) and the cleaning head water supply end pipe (8); the end pipe mounting holes (10) and the upper ends of the sleeve water supply end pipe (6) and the bag seat water supply end pipe (7) are all inserted and installed with the corresponding end pipe mounting holes (10); the end pipe mounting holes (10) and the sleeve water supply end pipe (6) and the bag seat water supply end pipe (7) are all connected and installed with the externally arranged water supply pipe through the threaded structure arranged at the end.

5. The screen cleaning device for coalbed methane well according to claim 1, characterized in that: The cleaning sleeve (2) is fixedly mounted on the middle part of the end rod of the cleaning liquid-conducting column (1); the middle part of the end rod of the cleaning liquid-conducting column (1) is provided with a water supply opening, and the water supply opening is connected to the sleeve water supply end pipe (6).

6. A screen cleaning device for a coalbed methane well according to claim 5, characterized in that: A plurality of cleaning nozzles (11) are provided, and a plurality of the cleaning nozzles (11) are evenly installed in a circular shape on the outer peripheral side of the cleaning sleeve (2).

7. A screen cleaning device for a coalbed methane well according to claim 1, characterized in that: The two groups of water-filled bladder seats (3) are respectively fixedly mounted on the upper and lower end column parts of the cleaning liquid guide column (1) through the cylinder seat. The water-filled bladder seat (3) is a ring-shaped device. The water-filled bladder seat (3) is connected to the bladder seat water supply end pipe (7). When the middle section is cleaned, the water-filled bladder seat (3) is installed by expanding to contact the inner wall of the screen tube.

8. The screen cleaning device for coalbed methane well according to claim 1, characterized in that: A threaded interface (13) is provided at the middle of the lower end of the cleaning liquid guide column (1), a threaded butt joint (12) is fixed to the upper part of the conical cleaning head (4), the threaded butt joint (12) and the threaded interface (13) are threadedly fastened and installed, and the threaded interface (13) is connected to the water supply end pipe (8) of the cleaning head.

9. A screen cleaning device for a coalbed methane well according to claim 8, characterized in that: The conical flow guide seat (14) is in the shape of a conical seat, a flow guide protrusion (15) is fixed in the middle of the conical flow guide seat (14), and the upper part of the flow guide protrusion (15) is in the shape of a spherical surface.

10. A screen cleaning device for a coalbed methane well according to claim 9, characterized in that: The guide protrusion (15) is fixedly installed with the conical cleaning head (4) via an inner support. After installation, the conical cleaning head (4) and the outside of the conical guide seat (14) form an annular cleaning nozzle.

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