A cleaning apparatus for coal seam gas wellbore screens

Abstract

The present application relates to the technical fields of wellbore screen cleaning, and particularly relates to a cleaning device for coalbed methane wellbore screen, which comprises a lifting box and a mounting seat arranged below the lifting box, a spacing adjustment element matched with the lifting box is mounted on the mounting seat, a plurality of arc-shaped plates are circumferentially arranged above the mounting seat, and a translation unit for driving the plurality of arc-shaped plates to translate is mounted on the lifting box; a plurality of rotating arms are circumferentially arranged above the mounting seat, a positioning strip is rotatably connected to the end of the rotating arm away from the lifting box, and the plurality of positioning strips and the plurality of arc-shaped plates are arranged alternately; the stepwise downward movement of the lifting box relative to the mounting seat is realized, so that the cleaning brush can be automatically moved down to the preset cleaning area, the step-by-step cleaning of the whole screen can be completed without the aid of external traction devices, and the continuous operation of fixing, cleaning, stepping and re-cleaning can be independently completed in the wellbore screen.

Description

Technical Field

[0001] This invention relates to the field of wellbore screen cleaning technology, and in particular to a cleaning device for coalbed methane wellbore screens. Background Technology

[0002] When installing tubing systems in coalbed methane wells, screen pipes are required. These screens filter proppant particles and coal dust from the coal seam to prevent them from entering the wellbore, thus avoiding pump jamming or reduced pump efficiency. As production time increases, coal dust, proppant, rock cuttings, scale, and other impurities gradually accumulate on the inner wall of the screen pipes, reducing the effective flow area and even clogging the screen holes, affecting production efficiency. Currently, screen pipe clogging is often addressed in the field by reverse circulation well washing or replacing the screen pipes during well workover. However, well washing requires surface pump trucks and large amounts of washing fluid, resulting in high costs, and its effectiveness in cleaning scale adhering to the inner wall of the screen pipes is limited. Replacing the screen pipes, on the other hand, involves prolonged interruption of production, complex engineering, and high costs.

[0003] Existing technologies also include some downhole cleaning tools, but most of them have simple structures and rely solely on brushes to scrape inside the wellbore. During the cleaning process, the tools are prone to deflection or jamming inside the wellbore, making it difficult to ensure continuous and effective contact between the cleaning brush and the inner wall of the screen pipe. More importantly, existing cleaning tools cannot achieve autonomous movement inside the wellbore and often require repeated lifting with steel wire ropes or external traction devices to move them segment by segment. This is cumbersome, inefficient, and difficult to control the cleaning position, easily resulting in the omission of some screen pipe sections and incomplete cleaning, which cannot meet the long-term stable production requirements of coalbed methane wells.

[0004] Therefore, in order to solve the above problems, a more suitable facility that meets the needs of users is needed. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a cleaning device for coalbed methane well screen pipes, so as to solve the problem that the existing cleaning tools cannot achieve autonomous stepping in the wellbore and are prone to missing some screen pipe sections.

[0006] To achieve the above objectives, the present invention provides a cleaning device for coalbed methane well screen pipes, including a lifting box and a mounting base disposed below the lifting box. The mounting base is equipped with a spacing adjustment component that cooperates with the lifting box. Several circumferentially distributed arc plates are provided above the mounting base. A translation unit for driving several arc plates to translate is installed on the lifting box.

[0007] The mounting base has several circumferentially distributed rotating arms above it. The end of the rotating arm away from the lifting box is rotatably connected to a positioning strip, and several positioning strips and several arc-shaped plates are staggered. The lifting box is equipped with an adjustment structure for changing the angle of the rotating arms and applying pressure to the rotating arms. At least three circumferentially distributed cleaning brushes are provided below the mounting base. A drive assembly for driving several cleaning brushes to translate and revolve is installed below the mounting base.

[0008] Optionally, the adjustment structure includes several rotating seats rotatably mounted on the outer wall of the lifting box. Several stop strips are fixedly connected to the outer wall of the lifting box, and the stop strips are located below the rotating seats. A first sliding groove is provided at the end of the rotating seat away from the lifting box. The end of the rotating arm away from the positioning strip is slidably mounted in the first sliding groove. A first slider is slidably provided in the first sliding groove. A first compression spring is provided in the first sliding groove, and the two ends of the first compression spring are fixedly connected to the rotating arm and the first slider, respectively. A push unit for driving the first slider to slide in the first sliding groove is installed on the lifting box.

[0009] Optionally, the pushing unit includes a support plate fixedly installed on the side of the first slider away from the rotating arm. The end of the support plate away from the first slider is located outside the first slide groove. A push plate is provided on the side of the support plate away from the first slider. A plurality of connecting blocks are provided inside the lifting box. A turntable is rotatably connected inside the lifting box. A first servo motor is fixedly connected to the top of the lifting box. The output end of the first servo motor is fixedly connected to the top of the turntable. One end of the connecting block is fixedly connected to the corresponding push plate. A transmission component that cooperates with the turntable is installed on the other end of the connecting block.

[0010] Optionally, the transmission component includes a rectangular ring fixedly installed on the end of the connecting block away from the push plate, with a movable column slidably disposed inside the rectangular ring, and the top end of the movable column being fixedly connected to the bottom of the turntable.

[0011] Optionally, the spacing adjustment component includes a first electric push rod fixedly installed on the top of the mounting base, and the telescopic end of the first electric push rod is fixedly connected to the bottom of the lifting box.

[0012] Optionally, the bottom of the lifting box is fixedly connected with several guide columns, and a guide sleeve is slidably fitted on the outside of the guide columns, with the bottom end of the guide sleeve fixedly connected to the top of the mounting base.

[0013] Optionally, the drive assembly includes a rotating shaft rotatably mounted below the mounting base. A second servo motor is fixedly connected to the bottom of the mounting base. The output end of the second servo motor is fixedly connected to the top end of the rotating shaft. A plurality of first prisms are fixedly connected to the rotating shaft. A movable sleeve is slidably fitted on the outside of the first prisms. The end of the movable sleeve away from the rotating shaft is fixedly connected to a corresponding cleaning brush. A second compression spring is provided inside the movable sleeve. The two ends of the second compression spring are fixedly connected to the first prism and the cleaning brush, respectively. A limiter that cooperates with the movable sleeve is installed below the mounting base.

[0014] Optionally, the limiter includes a support column fixedly installed above the movable sleeve, an adjustment frame is provided below the mounting base, a plurality of second electric push rods are fixedly connected to the mounting base, and the telescopic ends of the second electric push rods are fixedly connected to the top of the adjustment frame. A first push block and a second push block are respectively provided on both sides of the support column. The first push block and the second push block are both fixedly connected to the adjustment frame. The first push block and the second push block are both provided with inclined surfaces, and the inclination angles of the inclined surfaces on the first push block and the second push block are opposite.

[0015] Optionally, the translation unit includes several second sliders disposed within the lifting box. One end of the second slider facing the arc plate extends to the outside of the lifting box, and a second groove is provided at the end of the second slider facing the arc plate. A second prism is slidably disposed within the second groove, and a third compression spring is disposed within the second groove. The two ends of the third compression spring are respectively fixedly connected to the inner walls of the second prism and the second groove. The end of the second prism away from the third compression spring is fixedly connected to the corresponding arc plate. Several support frames are provided above the lifting box, and fixed columns are fixedly connected to both sides of the second slider. The bottom end of the support frame is provided with two inclined surfaces that cooperate with the fixed columns. A lifter for driving the lifting of several support frames is installed on the lifting box.

[0016] Optionally, the lifting device includes a mounting frame fixedly installed on the top of the lifting box, a third electric push rod fixedly connected to the top of the mounting frame, a lifting frame slidably installed on the mounting frame, and the top of the support frame fixedly connected to the lifting frame, and the telescopic end of the third electric push rod fixedly connected to the lifting frame.

[0017] The beneficial effects of this invention are as follows: By activating the translation drive unit, the linear motion output by the unit is transmitted and drives several arc-shaped plates to translate and press against the inner wall of the well screen pipe, achieving temporary fixation of the lifting box relative to the well screen pipe. The driving assembly drives the cleaning brush to translate and contact the inner wall of the well screen pipe, and then drives the cleaning brush to revolve, achieving active rotational cleaning of the inner wall of the well screen pipe. By adjusting the structure to adjust the tilt angle of the rotating arm and applying pressure to the rotating arm, the positioning strip remains pressed against the inner wall of the well screen pipe during the downward movement of the lifting box. Combined with the continuous contact between the cleaning brush and the inner wall of the well screen pipe, this ensures centering of the lifting box during vertical movement. To ensure safety and stability, and to prevent the cleaning equipment from tilting or getting stuck inside the well shaft, the system uses an arc-shaped plate and positioning strip to alternately press against the inner wall of the well shaft screen pipe. This, combined with the spacing adjustment mechanism that increases or decreases the distance between the lifting box and the mounting base, allows the lifting box to move downwards in a step-by-step manner relative to the mounting base. This enables the cleaning brush to automatically move down segment by segment to the preset cleaning area, completing the step-by-step cleaning of the entire screen pipe without the need for an external traction device. The system can autonomously complete continuous operations of fixing, cleaning, stepping, and re-cleaning within the well shaft screen pipe, effectively avoiding equipment tilting and blind spots during cleaning. This significantly improves the automation level and cleaning effect of well shaft screen pipe cleaning. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of the lifting box according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the lifting box according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the bottom of the turntable in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the internal structure of the rotating seat according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the disassembled structure of the second prism and the second slider in an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the driving component according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the disassembled movable sleeve and first prism in an embodiment of the present invention.

[0027] The diagram is marked as follows:

[0028] 1. Lifting box; 2. Arc-shaped plate; 3. Rotating arm; 4. Positioning strip; 5. Mounting base; 6. First compression spring; 7. Cleaning brush; 8. Rotating seat; 9. First slide groove; 10. First slider; 11. Stop strip; 12. Support plate; 13. Push plate; 14. Turntable; 15. First servo motor; 16. Movable column; 17. Rectangular ring; 18. Connecting block; 19. First electric push rod; 20. Guide column; 21. Guide sleeve; 22. 23. Movable sleeve; 24. Second compression spring; 25. Rotating shaft; 26. Second servo motor; 27. Support column; 28. Adjustment frame; 29. ​​Second electric push rod; 30. First push block; 31. Second push block; 32. First prism; 33. Second slider; 34. Second slide groove; 35. Second prism; 36. Third compression spring; 37. Support frame; 38. Fixed column; 39. Mounting frame; 40. Lifting frame. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0030] Example 1, by Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7 The present invention includes a lifting box 1 and a mounting base 5 disposed below the lifting box 1. The mounting base 5 is equipped with a spacing adjustment component that cooperates with the lifting box 1. Several arc-shaped plates 2 distributed in a circle are provided above the mounting base 5. The lifting box 1 is equipped with a translation unit for driving several arc-shaped plates 2 to translate.

[0031] The mounting base 5 is provided with several circumferentially distributed rotating arms 3. The end of the rotating arm 3 away from the lifting box 1 is rotatably connected to a positioning strip 4. Several positioning strips 4 and several arc plates 2 are arranged alternately. The lifting box 1 is equipped with an adjustment structure for changing the angle of the rotating arm 3 and applying pressure to the rotating arm 3. The mounting base 5 is provided with at least three circumferentially distributed cleaning brushes 7. The mounting base 5 is also equipped with a drive assembly for driving several cleaning brushes 7 to translate and revolve.

[0032] Furthermore, considering the differences in formation water salinity and scaling levels among different coalbed methane wells, the bristle material of cleaning brush 7 can be selected according to the actual well conditions. For wells with low salinity and mild scaling, nylon or fiber bristles can be used to reduce wear on the inner wall of the screen tube while ensuring cleaning effectiveness. For wells with high salinity and severe scaling (such as blocks with high salinity in deep formation water), metal bristles such as steel wire, stainless steel wire, or copper-plated steel wire can be used to effectively scrape and clean the hard scale layer on the inner wall of the screen tube using the hardness and wear resistance of the metal bristles. For wells with combined blockage of coal dust deposition and scaling, abrasive bristles can also be used to enhance the cutting ability of the scale layer by incorporating abrasive particles into the bristles. In practice, operators can select the appropriate cleaning brush 7 based on the measured mineralization data of the well shaft to be cleaned and the hardness test results of the scale layer, so as to achieve the best cleaning effect under different well conditions.

[0033] When the well screen needs cleaning, the operator places the lifting box 1 inside the well screen, and fixes one end of a rope to the top of the lifting box 1 and the other end of the rope to the outside of the well screen. By activating the translation drive unit, its output linear motion is transmitted and drives several arc-shaped plates 2 to translate. These arc-shaped plates 2 press against the inner wall of the well screen, fixing the arc-shaped plates 2 and the lifting box 1 relative to the well screen. The drive assembly is connected to multiple cleaning brushes 7, driving each cleaning brush 7 to translate synchronously along a preset linear trajectory, so that the cleaning brush 7 contacts the inner wall of the well screen. Then, the drive assembly drives each cleaning brush 7 to revolve synchronously around a common rotation axis, that is, each cleaning brush 7 moves circumferentially along the same circumferential trajectory. The movement of the cleaning brush 7 to clean the inner wall of the well screen tube requires the lifting box 1 to move downward inside the well screen tube. The adjustment mechanism, in transmission cooperation with the rotating arm 3, drives the rotating arm 3 to rotate, thereby changing its tilt angle relative to the horizontal plane. This allows the positioning strip 4 to slide along the inner wall of the well screen tube to below the arc plate 2. The force-applying end of the adjustment structure abuts against the force-bearing surface of the rotating arm 3, applying a clamping force to the rotating arm 3, pressing the positioning strip 4 against the inner wall of the well screen tube. Simultaneously, the drive assembly drives each cleaning brush 7 to move synchronously and continuously along a preset straight trajectory, increasing the pressure of the cleaning brush 7 on the well screen tube, thus fixing the cleaning brush 7 and the mounting base 5 relative to the well screen tube. Then, the translation drive unit is activated, and its output... After the linear motion is transmitted, it drives several arc-shaped plates 2 to stop pressing on the inner wall of the well screen pipe, releasing the fixation of the lifting box 1. Then, the distance between the lifting box 1 and the mounting base 5 is reduced by the spacing adjustment component, so that the lifting box 1 moves down relative to the mounting base 5. During the downward movement of the lifting box 1, the rotating arm 3 rotates relative to the positioning strip 4, and the positioning strip 4 always maintains the state of pressing on the inner wall of the well screen pipe. The force-applying end of the adjustment structure abuts against the force-bearing surface of the rotating arm 3 and controls the clamping force applied to the rotating arm 3, thereby controlling the force of the rotating arm 3 and the positioning strip 4 pressing on the inner wall of the well screen pipe. The cleaning brush 7 and the positioning strip 4 both abut against the inner wall of the well screen pipe to ensure the stability of the lifting box 1 when it moves vertically. When the lifting box 1 drives the arc-shaped plates 2 to move down to the positioning strip When the screen is on one side of 4, the translation drive unit is activated, and its output linear motion is transmitted to drive several arc-shaped plates 2 to press against the inner wall of the well screen again, so that the arc-shaped plates 2 are fixed relative to the lifting box 1. Then, the drive assembly drives each cleaning brush 7 to move synchronously in the opposite direction along a preset linear trajectory, so that the cleaning brush 7 no longer contacts the inner wall of the well screen, releasing the fixed relationship between the mounting base 5 and the well screen. By increasing the distance between the mounting base 5 and the lifting box 1 through the spacing adjustment component, the mounting base 5 can be moved downward relative to the lifting box 1, so that the cleaning brush 7 can move to the next cleaning area. Then, the drive assembly drives each cleaning brush 7 to move synchronously along the preset linear trajectory again, so that several cleaning brushes 7 contact the inner wall of the well screen again.Then, the drive assembly drives each cleaning brush 7 to rotate synchronously around a common axis of rotation, meaning each cleaning brush 7 moves circumferentially along the same circumferential trajectory. This allows the cleaning brushes 7 to clean the inner wall of the well screen. Once the well screen is completely cleaned, the drive assembly stops the cleaning brushes 7 from pressing against the inner wall of the well screen. The translation drive unit is then activated, and its output linear motion, after transmission, causes several arc-shaped plates 2 to stop pressing against the inner wall of the well screen. The adjustment structure also adjusts the position of the rotating arm 3 so that the positioning strip 4 is no longer pressed tightly against the inner wall of the well screen. The operator can then quickly pull the lifting box 1 and the mounting base 5 out of the well screen using ropes.

[0034] Example 2, based on Example 1, is... Figure 2 , Figure 3 , Figure 4 and Figure 5 The adjustment structure includes several rotating seats 8 rotatably mounted on the outer wall of the lifting box 1. Several stop strips 11 are fixedly connected to the outer wall of the lifting box 1, and the stop strips 11 are located below the rotating seats 8. A first slide groove 9 is provided at the end of the rotating seat 8 away from the lifting box 1. The end of the rotating arm 3 away from the positioning strip 4 is slidably mounted in the first slide groove 9. A first slider 10 is slidably mounted in the first slide groove 9. A first compression spring 6 is provided in the first slide groove 9, and the two ends of the first compression spring 6 are fixedly connected to the rotating arm 3 and the first slider 10, respectively. A pushing unit for driving the first slider 10 to slide in the first slide groove 9 is installed on the lifting box 1. The pushing unit includes a support plate 12 fixedly mounted on the side of the first slider 10 away from the rotating arm 3. The end of the support plate 12 away from the first slider 10 is located outside the first slide groove 9. The side of the support plate 12 away from the first slider 10 is in contact with the push plate 13. The lifting box 1 is provided with several connecting blocks 18. The lifting box 1 is rotatably connected to the turntable 14. The top of the lifting box 1 is fixedly connected to the first servo motor 15. The output end of the first servo motor 15 is fixedly connected to the top of the turntable 14. One end of the connecting block 18 is fixedly connected to the corresponding push plate 13. The other end of the connecting block 18 is equipped with a transmission component that cooperates with the turntable 14. The transmission component includes a rectangular ring 17 fixedly installed on the end of the connecting block 18 away from the push plate 13. A movable column 16 is slidably provided in the rectangular ring 17, and the top end of the movable column 16 is fixedly connected to the bottom of the turntable 14.

[0035] The first servo motor 15 drives the turntable 14 to rotate, and the turntable 14 drives the movable column 16 to slide within the rectangular ring 17. The movable column 16 then pushes the rectangular ring 17, the connecting block 18, and the push plate 13 to translate relative to the lifting box 1. The push plate 13 pushes the support plate 12 and the first slider 10 to slide relative to the rotating seat 8, reducing the distance between the first slider 10 and the rotating arm 3. The first compression spring 6 is in a compressed state, and the first compression spring 6 applies pressure to the rotating arm 3 and the positioning strip 4, so that the positioning strip 4 presses against the inner wall of the well screen pipe. It is necessary to change the tilt angle of the rotating arm 3 to... When the positioning strip 4 moves downward relative to the arc plate 2, the first servo motor 15 drives the turntable 14 to rotate in the opposite direction, so that the push plate 13 moves away from the rotating seat 8. The first compression spring 6 pushes the first slider 10 and the support plate 12 to move along with the push plate 13. The first compression spring 6 gradually returns to its initial length. The friction between the positioning strip 4 and the inner wall of the well screen is less than the component of the weight of the positioning strip 4 and the rotating arm 3 along the well wall. At this time, the positioning strip 4 slides down relative to the inner wall of the well screen, the rotating arm 3 rotates relative to the positioning strip 4, and the rotating seat 8 rotates relative to the lifting box 1. Finally, the rotation... The bottom of the rotating seat 8 contacts the stop strip 11. When the rotating seat 8 rotates to a preset angle, it stops rotating. At this time, the first servo motor 15 drives the turntable 14 to rotate again, so that the push plate 13 moves toward the rotating seat 8. The push plate 13 can then push the support plate 12 and the first slider 10 to slide relative to the rotating seat 8. By changing the length of the first compression spring 6, the force of the positioning strip 4 pressing on the inner wall of the well screen tube can be controlled. When the spacing adjustment component drives the lifting box 1 to move down relative to the mounting seat 5, the lifting box 1 moves down relative to the positioning strip 4, and the rotating seat 8 rotates relative to the lifting box 1. When the positioning bar 4 rotates relative to the rotating seat 8, the stop bar 11 no longer supports the rotating seat 8, and the rotating arm 3 slides relative to the first slide groove 9. The distance between the rotating arm 3 and the first slider 10 changes. The first servo motor 15 controls the turntable 14 to rotate, thereby changing the position of the push plate 13 relative to the lifting box 1, and thus adjusting the position of the first slider 10 in the first slide groove 9. This changes the distance between the rotating arm 3 and the first slider 10, thereby adjusting the deformation degree of the first compression spring 6. During the downward movement of the lifting box 1, the force of the positioning bar 4 pressing the inner wall of the well screen pipe can be adjusted.

[0036] Example 3, based on Example 1, is... Figure 1 , Figure 7 and Figure 8The spacing adjustment component includes a first electric push rod 19 fixedly installed on the top of the mounting base 5, with the telescopic end of the first electric push rod 19 fixedly connected to the bottom of the lifting box 1. Several guide posts 20 are fixedly connected to the bottom of the lifting box 1. Guide sleeves 21 are slidably fitted onto the outer side of each guide post 20, and the bottom end of the guide sleeves 21 is fixedly connected to the top of the mounting base 5. The drive assembly includes a rotating shaft 24 rotatably installed below the mounting base 5. A second servo motor 25 is fixedly connected to the bottom of the mounting base 5. The output end of the second servo motor 25 is fixedly connected to the top end of the rotating shaft 24. Several first prisms 31 are fixedly connected to the rotating shaft 24. Movable sleeves 22 are slidably fitted onto the outer side of each first prism 31, and the end of the movable sleeve 22 away from the rotating shaft 24 is fixedly connected to a corresponding cleaning brush 7. The movable sleeve 22 is provided with a second compression spring 23, and the two ends of the second compression spring 23 are fixedly connected to the first prism 31 and the cleaning brush 7 respectively. A limiter that cooperates with the movable sleeve 22 is installed below the mounting base 5. The limiter includes a support column 26 fixedly installed above the movable sleeve 22. An adjustment frame 27 is provided below the mounting base 5. Several second electric push rods 28 are fixedly connected to the mounting base 5, and the telescopic ends of the second electric push rods 28 are fixedly connected to the top of the adjustment frame 27. A first push block 29 and a second push block 30 are provided on both sides of the support column 26 respectively. The first push block 29 and the second push block 30 are both fixedly connected to the adjustment frame 27. The first push block 29 and the second push block 30 are both provided with inclined surfaces, and the inclination angles of the inclined surfaces on the first push block 29 and the second push block 30 are opposite.

[0037] The lifting box 1 is driven to move vertically relative to the mounting base 5 by the first electric push rod 19, thereby changing the distance between the lifting box 1 and the mounting base 5. The lifting box 1 also drives the guide column 20 to slide relative to the guide sleeve 21. The design of the guide column 20 and guide sleeve 21 prevents the lifting box 1 from tilting or swaying relative to the mounting base 5. The second compression spring 23 is initially in a compressed state, applying pressure to the cleaning brush 7 and the movable sleeve 22, causing the cleaning brush 7 to press against the inner wall of the well screen. The second servo motor 25 drives the rotating shaft 24 and the first prism 31 to rotate, allowing the first prism 31 to drive the cleaning brush 7 to clean the inner wall of the well screen through the movable sleeve 22. When it is necessary to increase the pressure of the cleaning brush 7 against the inner wall of the well screen, the second servo motor 25 drives the rotating shaft 24 to rotate. The movable sleeve 22 drives the support column 26 to move between the first push block 29 and the second push block 30. Then, the second electric push rod 28 drives the adjusting frame 27 and the first push block 29 to move upward. The inclined surface on the first push block 29 contacts the end of the support column 26. As the first push block 29 continues to move upward, it pushes the support column 26 and the movable sleeve 22 to slide relative to the first prism 31, so that the cleaning brush 7 is in close contact with the inner wall of the well screen. Conversely, when the second electric push rod 28 drives the adjusting frame 27 to move downward, the inclined surface on the second push block 30 contacts the other end of the support column 26. As the second push block 30 continues to move downward, it pushes the support column 26 and the movable sleeve 22 to slide in the opposite direction relative to the first prism 31, so that the cleaning brush 7 is no longer in contact with the inner wall of the well screen.

[0038] Example 4, based on Example 1, by Figure 1 , Figure 2 , Figure 3 and Figure 6 The translation unit includes several second sliders 32 disposed within the lifting box 1. One end of each second slider 32 facing the arc-shaped plate 2 extends to the outside of the lifting box 1. A second groove 33 is formed at the end of each second slider 32 facing the arc-shaped plate 2. A second prism 34 is slidably disposed within the second groove 33. A third compression spring 35 is disposed within the second groove 33. Both ends of the third compression spring 35 are fixedly connected to the inner walls of the second prism 34 and the second groove 33, respectively. The end of the second prism 34 away from the third compression spring 35 is fixedly connected to the corresponding arc-shaped plate 2. The upper part of the lifting box 1... The lifting box 1 is provided with several support frames 36. The two sides of the second slider 32 are fixedly connected with fixed columns 37. The bottom end of the support frame 36 is provided with two inclined surfaces that cooperate with the fixed columns 37. The lifting box 1 is equipped with a lifting device for driving the lifting of several support frames 36. The lifting device includes a mounting frame 38 fixedly installed on the top of the lifting box 1. The top of the mounting frame 38 is fixedly connected with a third electric push rod 39. The lifting frame 40 is slidably installed on the mounting frame 38. The top of the support frame 36 is fixedly connected to the lifting frame 40. The telescopic end of the third electric push rod 39 is fixedly connected to the lifting frame 40.

[0039] The lifting frame 40 is driven to move vertically by the third electric push rod 39. The lifting frame 40 drives the support frame 36 to move vertically. The fixed column 37 slides on the inclined surface of the support frame 36. The support frame 36 pushes the fixed column 37 and the second slider 32 to move horizontally. The second slider 32 pushes the arc plate 2 to contact the inner wall of the well screen pipe through the third compression spring 35 and the second prism 34. As the lifting frame 40 continues to move downward, the second slider 32 slides relative to the second prism 34. The length of the third compression spring 35 becomes shorter. The third compression spring 35 applies pressure to the second prism 34 and the arc plate 2, increasing the pressure applied by the arc plate 2 to the inner wall of the well screen pipe, so that the arc plate 2 and the lifting box 1 are fixed relative to the well screen pipe.

[0040] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A cleaning device for coalbed methane well screen pipes, comprising a lifting box (1) and a mounting base (5) disposed below the lifting box (1), characterized in that, The mounting base (5) is equipped with a spacing adjustment component that cooperates with the lifting box (1). Above the mounting base (5) are several arc-shaped plates (2) arranged in a circular pattern. The lifting box (1) is equipped with a translation unit for driving several arc-shaped plates (2) to translate. The mounting base (5) is provided with several circumferentially distributed rotating arms (3) above it. The end of the rotating arm (3) away from the lifting box (1) is rotatably connected to a positioning strip (4). Several positioning strips (4) and several arc plates (2) are staggered. The lifting box (1) is equipped with an adjustment structure for changing the angle of the rotating arm (3) and applying pressure to the rotating arm (3). At least three circumferentially distributed cleaning brushes (7) are provided below the mounting base (5). A drive assembly for driving several cleaning brushes (7) to translate and revolve is installed below the mounting base (5).

2. The cleaning equipment for coalbed methane well screen pipes according to claim 1, characterized in that, The adjustment structure includes several rotating seats (8) rotatably mounted on the outer wall of the lifting box (1). Several stop strips (11) are fixedly connected to the outer wall of the lifting box (1), and the stop strips (11) are located below the rotating seats (8). A first slide groove (9) is provided at one end of the rotating seat (8) away from the lifting box (1). The end of the rotating arm (3) away from the positioning strip (4) is slidably mounted in the first slide groove (9). A first slider (10) is slidably provided in the first slide groove (9). A first compression spring (6) is provided in the first slide groove (9), and the two ends of the first compression spring (6) are fixedly connected to the rotating arm (3) and the first slider (10) respectively. A push unit for driving the first slider (10) to slide in the first slide groove (9) is installed on the lifting box (1).

3. The cleaning equipment for coalbed methane wellbore screens according to claim 2, characterized in that, The pushing unit includes a support plate (12) fixedly installed on the side of the first slider (10) away from the rotating arm (3). The end of the support plate (12) away from the first slider (10) is located outside the first slide groove (9). The side of the support plate (12) away from the first slider (10) is in contact with a push plate (13). The lifting box (1) is provided with several connecting blocks (18). The lifting box (1) is rotatably connected to a turntable (14). The top of the lifting box (1) is fixedly connected to a first servo motor (15). The output end of the first servo motor (15) is fixedly connected to the top of the turntable (14). One end of the connecting block (18) is fixedly connected to the corresponding push plate (13). The other end of the connecting block (18) is equipped with a transmission component that cooperates with the turntable (14).

4. The cleaning equipment for coalbed methane wellbore screens according to claim 3, characterized in that, The transmission component includes a rectangular ring (17) fixedly installed on the end of the connecting block (18) away from the push plate (13), and a movable column (16) is slidably provided inside the rectangular ring (17), and the top of the movable column (16) is fixedly connected to the bottom of the turntable (14).

5. The cleaning equipment for coalbed methane well screen pipes according to claim 1, characterized in that, The spacing adjustment component includes a first electric push rod (19) fixedly installed on the top of the mounting base (5), and the telescopic end of the first electric push rod (19) is fixedly connected to the bottom of the lifting box (1).

6. The cleaning equipment for coalbed methane wellbore screens according to claim 1, characterized in that, The bottom of the lifting box (1) is fixedly connected with several guide columns (20), and the guide column (20) is slidably fitted with a guide sleeve (21), and the bottom end of the guide sleeve (21) is fixedly connected to the top of the mounting base (5).

7. The cleaning equipment for coalbed methane wellbore screens according to claim 1, characterized in that, The drive assembly includes a rotating shaft (24) rotatably mounted below the mounting base (5). A second servo motor (25) is fixedly connected to the bottom of the mounting base (5). The output end of the second servo motor (25) is fixedly connected to the top end of the rotating shaft (24). A plurality of first prisms (31) are fixedly connected to the rotating shaft (24). A movable sleeve (22) is slidably fitted on the outside of the first prisms (31). The end of the movable sleeve (22) away from the rotating shaft (24) is fixedly connected to the corresponding cleaning brush (7). A second compression spring (23) is provided inside the movable sleeve (22). The two ends of the second compression spring (23) are fixedly connected to the first prism (31) and the cleaning brush (7) respectively. A limiter that cooperates with the movable sleeve (22) is installed below the mounting base (5).

8. The cleaning equipment for coalbed methane well screen pipes according to claim 7, characterized in that, The limiter includes a support column (26) fixedly installed above the movable sleeve (22), an adjustment frame (27) is provided below the mounting base (5), a number of second electric push rods (28) are fixedly connected to the mounting base (5), and the telescopic end of the second electric push rod (28) is fixedly connected to the top of the adjustment frame (27). A first push block (29) and a second push block (30) are respectively provided on both sides of the support column (26). The first push block (29) and the second push block (30) are both fixedly connected to the adjustment frame (27). The first push block (29) and the second push block (30) are both provided with inclined surfaces, and the inclination angles of the inclined surfaces on the first push block (29) and the second push block (30) are opposite.

9. The cleaning equipment for coalbed methane well screen pipes according to claim 1, characterized in that, The translation unit includes several second sliders (32) disposed in the lifting box (1). The end of the second slider (32) facing the arc plate (2) extends to the outside of the lifting box (1), and the end of the second slider (32) facing the arc plate (2) is provided with a second groove (33). A second prism (34) is slidably disposed in the second groove (33). A third compression spring (35) is disposed in the second groove (33). The two ends of the third compression spring (35) are fixedly connected to the inner wall of the second prism (34) and the second groove (33), respectively. The end of the second prism (34) away from the third compression spring (35) is fixedly connected to the corresponding arc plate (2). Several support frames (36) are provided above the lifting box (1). Fixed columns (37) are fixedly connected to both sides of the second slider (32). The bottom end of the support frame (36) is provided with two inclined surfaces that cooperate with the fixed columns (37). A lifter for driving the lifting of several support frames (36) is installed on the lifting box (1).

10. The cleaning equipment for coalbed methane wellbore screens according to claim 9, characterized in that, The lifting device includes a mounting frame (38) fixedly installed on the top of the lifting box (1), a third electric push rod (39) fixedly connected to the top of the mounting frame (38), a lifting frame (40) slidably installed on the mounting frame (38), and the top of the support frame (36) is fixedly connected to the lifting frame (40), and the telescopic end of the third electric push rod (39) is fixedly connected to the lifting frame (40).

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