Anti-blocking filter screen for coalbed methane well drainage

Abstract

The utility model provides a special anti-blocking filtering screen pipe for coalbed methane well drainage, which relates to the technical field of coalbed methane well screen pipes, and comprises a plurality of pipelines, wherein the outer wall of the pipeline is provided with a plurality of windows distributed in an annular array, and the inner wall of the pipeline is fixedly connected with a holder at both sides of the window, the holder is arranged along the length direction of the pipeline, and a screen plate is inserted between two holders at any window, and a kit is lifted and lowered along a central rod to realize lifting and lowering of a plurality of screen plates connected to the kit along the holder, that is, the screen plate part located at the window can be adjusted to ensure that the surface of the screen plate at the window is in a transparent state, and when the screen plate is lifted and lowered through the inner wall of the window, impurities originally attached to the outer wall of the screen plate will also be scraped off under the action of the inner wall of the window, so as to realize cleaning and prevent blockage, and there is no need to take out the entire pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of coalbed methane well screen pipes, in particular to a special anti-blocking filtering screen pipe for coalbed methane well drainage and production. Background Art

[0002] Coalbed methane is commonly known as "gas". Its main component is methane, which is a gas produced during the formation and metamorphosis of coal. Methane is usually supported in the coalbed methane by water pressure. During mining, screen pipes are required to prevent coal blocks in underground coal mines from being ejected along with other impurities along with the coalbed methane.

[0003] Therefore, the prior art coalbed methane well sand control and coal powder blockage prevention screen pipe, publication number: CN212027755U, includes: a perforated screen pipe, one end of which is connected to the pump body through a first coupling, and the perforated screen pipe is provided with spirally distributed filtering holes; a slotted screen pipe, one end of which is connected to the other end of the perforated screen pipe through a second coupling, and the slotted screen pipe has parallel and staggered filtering slots; a wire-wrapped screen pipe, one end of which is connected to the other end of the slotted screen pipe through a third coupling, and the wire-wrapped screen pipe has filtering gaps; and a wire plug, which is arranged at the other end of the wire-wrapped screen pipe, and three combined screen pipes with excellent performance are adopted to improve the reliability of sand control and coal powder control through the different control particle sizes of each screen pipe, while minimizing the occurrence of screen pipe blockage.

[0004] However, when the existing technology realizes filtration, the filtered substances will also adhere to the surface of the screen tube, causing the air permeability of the screen tube surface to decrease. In addition, because the underground situation is unclear, personnel are required to pull out the screen tube from time to time to clean and dredge the screen tube surface. Utility Model Content

[0005] The utility model aims to solve the problems existing in the prior art and proposes a special anti-blocking filter screen pipe for coalbed methane well drainage.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a special anti-blocking filter screen pipe for coalbed methane well drainage, including a plurality of pipes, the outer wall of the pipe is provided with a plurality of windows distributed in a circular array, and the inner wall of the pipe is fixedly connected with a holder at both sides of the window, the holder is arranged along the length direction of the pipe, and a screen plate is inserted between two holders at any window, a center rod is fixedly connected at the center of the pipe, a fixing frame is fixedly connected to the center rod at a position at the same height as the window, and a set of fixed connections of a plurality of screen plates is sleeved on the center rod, a connecting rod is fixedly connected through the set, one end of the connecting rod is fixedly connected with a connecting frame sleeved on the fixing frame, the connecting frame is fixedly connected with a connecting sleeve away from one end of the connecting rod, the connecting sleeve is inserted into the connecting rod, and a spring rod is connected between the connecting sleeve and the fixing frame.

[0007] Preferably, the side of the fixing frame is slidably connected to the inner wall of the sieve plate, and the upper and lower surfaces of the fixing frame are fixedly connected with wire brushes for cleaning the inner wall of the sieve plate.

[0008] Preferably, a block that is plugged into the socket is fixedly connected to one end of the inner wall of the pipe, one end of the center rod is stepped, and the other end is cylindrical and plugged into the stepped end of the center rod, and through holes that cooperate with fastening screws are provided on the block and the pipe.

[0009] Preferably, the outer wall of the connecting sleeve is threadedly connected with a fastening screw for passing through the connecting sleeve and the connecting rod.

[0010] Preferably, several of the pipes are spliced ​​end to end and located in the pipe at the top, the top of the center rod is threadedly connected to a mounting seat, a driving telescopic member is installed on the mounting seat, and the telescopic end of the driving telescopic member is rotatably connected to a threaded ring threadedly connected to the surface of the connecting rod.

[0011] Preferably, the top edge and the bottom edge of the window are both chamfered, and in two adjacent pipes, the outer wall of one pipe is rotatably connected to a nut threadedly connected to the outer wall of the other pipe.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] 1. In the utility model, the kit is lifted and lowered along the center rod, so that a plurality of sieve plates connected to the kit can be lifted and lowered along the base, that is, the sieve plate portion located at the window can be adjusted to ensure that the sieve plate surface at the window is in a transparent state, and when the sieve plate is lifted and lowered through the inner wall of the window, impurities originally attached to the outer wall of the sieve plate will also be scraped off by the action of the inner wall of the window, thereby achieving cleaning and preventing blockage, without the need to remove the entire pipeline.

[0014] 2. In the utility model, by setting a clamping block, a nut and a fastening screw, utilizing the plug-in connection between the clamping block and the clamping seat, and the threaded connection between the nut and the pipe, a plurality of pipes can be combined and spliced, which can be used in coalbed methane wells of different depths. The fastening screws provided can ensure that the kits in the spliced-together pipes are in a rigidly connected state, thereby ensuring that the sieve plates in the spliced-together pipes can be smoothly raised and lowered at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model provides a three-dimensional structural diagram of a special anti-blocking filter screen for coalbed methane well drainage;

[0016] Figure 2 The utility model proposes a special anti-blocking filter screen for coalbed methane well drainage Figure 1 A schematic cross-sectional structure diagram of;

[0017] Figure 3The utility model proposes a special anti-blocking filter screen for coalbed methane well drainage Figure 2 A schematic cross-sectional structure diagram of ;

[0018] Figure 4 for Figure 3 A schematic cross-sectional structure diagram of ;

[0019] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0020] Legend: 1. Pipe; 2. Window; 3. Nut; 4. Sieve plate; 5. Block; 6. Through hole; 7. Center rod; 8. Kit; 9. Connecting rod; 10. Fixing bracket; 11. Mounting seat; 12. Driving telescopic part; 13. Threaded ring; 14. Clamping seat; 15. Wire brush; 16. Connecting frame; 17. Connecting sleeve; 18. Spring rod; 19. Fastening screw. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0023] like Figure 1-5As shown, a special anti-blocking filter screen pipe for coalbed methane well drainage includes a plurality of pipes 1, the outer wall of the pipe 1 is provided with a plurality of windows 2 distributed in a circular array, and the inner wall of the pipe 1 is fixedly connected with a holder 14 at both sides of the window 2, the holder 14 is arranged along the length direction of the pipe 1, and a sieve plate 4 is inserted between two holders 14 at any window 2, and the length of the sieve plate 4 is greater than one times the height of the window 2, so that the sieve plate 4 can slide along between the two holders 14, so that the impurities accumulated on the surface of the sieve plate 4 at the window 2 can be scraped off by the edge of the window 2 as the sieve plate 4 moves, thereby ensuring the permeability of the sieve plate 4 at the window 2, and there is no need to take out the pipe 1, a center rod 7 is fixedly connected at the center of the pipe 1, a fixing frame 10 is fixedly connected to the center rod 7 at a position at the same height as the window 2, and a set 8 for fixing the plurality of sieve plates 4 is sleeved on the center rod 7, a connecting rod 9 is fixedly connected through the set 8, and one end of the connecting rod 9 is fixedly connected with a sleeve on the fixing frame 10 The connecting frame 16 on the connecting rod 9 is fixedly connected with a connecting sleeve 17 at one end of the connecting frame 16 away from the connecting rod 9. The connecting sleeve 17 is plugged into the connecting rod 9, and a spring rod 18 is connected between the connecting sleeve 17 and the fixing frame 10. The spring rod 18 is set to ensure that the positions of the connecting sleeve 17, the connecting frame 16 and the connecting rod 9 remain unchanged when no external force is applied, thereby achieving the stability of the position of the set 8 fixed to the connecting rod 9 and the sieve plate 4 fixed to the set 8. When the connecting rod 9 is subjected to downward pressure, the connecting frame 16 is driven to slide downward on the fixing frame 10, and the spring rod 18 is elastically extended at the same time. The side of the fixing frame 10 is slidably connected to the inner wall of the sieve plate 4, and the upper and lower surfaces of the fixing frame 10 are fixedly connected with a wire brush 15 for cleaning the inner wall of the sieve plate 4. When the sieve plate 4 is lifted and lowered in the card seat 14 as the set 8 is lifted and lowered on the center rod 7, when passing through the wire brush 15 at the fixing frame 10, the wire brush 15 can be used to push out and clean the impurities in the sieve holes on the surface of the sieve plate 4.

[0024] Further discussion, in order to facilitate the combined use of multiple pipelines 1 and adapt to coalbed methane wells of different depths: a block 5 plugged into the card seat 14 is fixedly connected to one end of the inner wall of the pipeline 1, one end of the center rod 7 is stepped, and the other end is cylindrical and plugged into the stepped end of the center rod 7, the outer wall of the connecting sleeve 17 is threadedly connected with a fastening screw 19 for passing through the connecting sleeve 17 and the connecting rod 9, and a through hole 6 matching the fastening screw 19 is opened on the block 5 and the pipeline 1. When two adjacent pipelines 1 are combined, the block 5 on one of the pipelines 1 is inserted into the other pipeline 1, and one end of the center rod 7 on one of the pipes 1 is inserted into the other end of the center rod 7 in the other pipe 1. At the same time, the connecting rod 9 in one of the pipes 1 is inserted into the connecting sleeve 17 in the other pipe 1. As shown in the figure, the connecting rod 9 in the plugged state coincides with the hollow part on the surface of the connecting sleeve 17, and the plugged block 5 also coincides with the through hole 6 on the card seat 14. Therefore, it is convenient to use a screwdriver to pass through the overlapping through hole 6 and get stuck on the fastening screw 19, and the fastening screw 19 can be rotated to achieve the fastening screw 19 through. The hollow overlap of the connecting rod 9 and the connecting sleeve 17 in the plugged state realizes the rigid connection of the connecting rod 9 parts of the two adjacent pipes 1, and the exposed through hole 6 can be sealed by the spiral mounting bolt, and the relative position of the block 5 and the pipe 1 can be fixed. A plurality of pipes 1 are connected end to end and located in the pipe 1 at the top, and the top of the center rod 7 is threadedly connected with a mounting seat 11, and a driving telescopic member 12 is installed on the mounting seat 11. The driving telescopic member 12 preferably selects the common waterproof electric telescopic rod or electric push rod on the market. The telescopic end 12 is rotatably connected to a threaded ring 13 threadedly connected to the surface of the connecting rod 9. After the driving telescopic member 12 is installed, the driving telescopic member 12 is extended and retracted to realize the simultaneous lifting and lowering of the connecting rods 9 in the spliced ​​pipes 1. The top and bottom edges of the window 2 are chamfered to facilitate the removal of impurities accumulated on the outer wall of the sieve plate 4. Among the two adjacent pipes 1, the outer wall of one of the pipes 1 is rotatably connected to a nut 3 threadedly connected to the outer wall of the other pipe 1. The nut 3 can ensure that the butt end faces of the two adjacent pipes 1 are sealed and fit to ensure sealing.

[0025] Working principle: When in use, the corresponding number of pipes 1 are spliced ​​and combined according to the depth of the coalbed methane well, and then the mounting seat 11 is installed on the pipe 1 at the top, and the combined pipes 1 are placed in the coalbed methane well, and the sieve plate 4 at the window 2 is used for filtering. After a period of use, the telescopic member 12 is driven to extend, so that the connecting rod 9 in the spliced ​​pipes 1 drives the corresponding position of the kit 8 to descend at the same time, and then the sieve plate 4 in the pipe 1 is simultaneously descended along the holder 14. When the sieve plate 4 rises and falls in the holder 14 as the kit 8 rises and falls on the center rod 7, the impurities on the outer wall of the sieve plate 4 are scraped off through the chamfer at the window 2, and when the inner wall of the sieve plate 4 passes through the wire brush 15 at the fixing frame 10, the wire brush 15 can be used to push out and clean the impurities in the sieve holes on the surface of the sieve plate 4.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A special anti-blocking filter screen for coalbed methane well drainage, comprising a plurality of pipes (1), characterized in that: The outer wall of the pipeline (1) is provided with a plurality of windows (2) distributed in a circular array, and the inner wall of the pipeline (1) is fixedly connected to holders (14) at positions on both sides of the windows (2), the holders (14) are arranged along the length direction of the pipeline (1), and a sieve plate (4) is inserted between two holders (14) at any window (2), a center rod (7) is fixedly connected at the center of the pipeline (1), and a fixing frame (10) is fixedly connected to the center rod (7) at a position at the same height as the window (2), Furthermore, a sleeve (8) is sleeved on the central rod (7) and fixedly connected to a plurality of sieve plates (4); a connecting rod (9) is passed through and fixedly connected to the sleeve (8); one end of the connecting rod (9) is fixedly connected to a connecting frame (16) sleeved on a fixing frame (10); one end of the connecting frame (16) away from the connecting rod (9) is fixedly connected to a connecting sleeve (17); the connecting sleeve (17) is plugged into the connecting rod (9), and a spring rod (18) is connected between the connecting sleeve (17) and the fixing frame (10).

2. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 1 is characterized in that: The side of the fixing frame (10) is slidably connected to the inner wall of the sieve plate (4), and a wire brush (15) for cleaning the inner wall of the sieve plate (4) is fixedly connected to the upper and lower surfaces of the fixing frame (10).

3. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 1 is characterized in that: A clamping block (5) plugged into a clamping seat (14) is fixedly connected to one end of the inner wall of the pipe (1); one end of the center rod (7) is stepped and the other end is cylindrical and plugged into the stepped end of the center rod (7); and through holes (6) cooperating with fastening screws (19) are provided on the clamping block (5) and the pipe (1).

4. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 1 is characterized in that: The outer wall of the connecting sleeve (17) is threadedly connected with a fastening screw (19) for passing through the connecting sleeve (17) and the connecting rod (9).

5. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 1 is characterized in that: In a pipe (1) where a plurality of pipes (1) are spliced ​​end to end and located at the top, a mounting seat (11) is threadedly connected to the top of the center rod (7), a driving telescopic member (12) is mounted on the mounting seat (11), and a threaded ring (13) is rotatably connected to the surface of the connecting rod (9) through a threaded connection at the telescopic end of the driving telescopic member (12).

6. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 1 is characterized in that: The top edge and the bottom edge of the window (2) are both chamfered, and the outer wall of one of the two adjacent pipes (1) is rotatably connected to a nut (3) threadedly connected to the outer wall of the other pipe (1).

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