Screen cleaning device for coalbed methane wells

Abstract

The present invention relates to the technical field of coalbed methane well construction, and in particular to a screen cleaning device for coalbed methane wells, comprising: the top of a conversion joint is connected to a fixed valve joint, and a screen is inserted into the bottom of the conversion joint; a connecting pipe is connected to the conversion joint and is located in the screen, and the connecting pipe includes a plurality of unit pipes; a centralizer is connected between two adjacent unit pipes, and the centralizer includes two centralizing ring pipes and a plurality of arc-shaped pipes connected to the two centralizing ring pipes and in an arc shape; a rotating nozzle is connected between two adjacent unit pipes, and the rotating nozzle includes a rotating drum connected to the corresponding unit pipe, a central pipe connected to the inner wall of the rotating drum, a shell rotatably connected to the outer wall of the rotating drum, and an impeller connected to the side of the shell close to the central pipe, and the central pipe is provided with a liquid inlet hole, and the shell is provided with a nozzle hole. The present invention improves the cleaning effect of the screen.

Description

Technical Field

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

[0002] When the screen pipe of a coalbed methane well is blocked, well repair operations are required, which requires shutting down the well, and the operation process is complicated and costly. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a screen cleaning device for a coalbed methane well, which solves the technical problem of the difficulty in cleaning the inner wall of the screen in the traditional technology, improves the cleaning effect of the screen, avoids the screen cleaning device from damaging the screen, and improves the structural stability of the screen.

[0004] The present invention provides a screen cleaning device for a coalbed methane well, comprising:

[0005] A conversion joint, the top end of which is connected to a fixed valve joint, and a screen tube is inserted into the bottom end of the conversion joint;

[0006] A connecting pipe, the connecting pipe is connected to the conversion joint and is located in the screen pipe, and the connecting pipe includes a plurality of unit pipes;

[0007] A centralizer, the centralizer is connected between two adjacent unit pipes, and the centralizer includes two centralizing ring pipes and a plurality of arc-shaped pipes connected to the two centralizing ring pipes and in an arc shape;

[0008] A rotating spray head, the rotating spray head is connected between two adjacent unit pipes, the rotating spray head comprises a rotating drum connected to the corresponding unit pipe, a central pipe connected to the inner wall of the rotating drum, a shell rotatably connected to the outer wall of the rotating drum, and an impeller connected to the side of the shell close to the central pipe, the central pipe is provided with a liquid inlet hole, and the shell is provided with a nozzle hole;

[0009] The high-pressure cleaning liquid enters the conversion joint, flows through the connecting pipe and the centralizer, and then enters the rotating nozzle, so that the high-pressure cleaning liquid enters between the central tube and the outer shell from the liquid inlet hole, and then the high-pressure cleaning liquid drives the impeller to rotate, thereby driving the outer shell to rotate, so that the high-pressure cleaning liquid is sprayed outward from the nozzle hole to clean the screen tube.

[0010] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that the conversion joint includes a head and a tail, an inner channel is opened in the conversion joint, and the inner channel is used to communicate with the fixed valve joint and the screen.

[0011] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that a diversion hole is opened in the middle of the conversion joint, a diversion interface is opened on the side wall of the conversion joint corresponding to the diversion hole, the conversion joint protrudes downward at the position corresponding to the diversion hole to form a connecting boss, the connecting pipe is connected to the connecting boss, and the high-pressure cleaning fluid is introduced into the diversion hole through the diversion interface.

[0012] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that the centralizers are arranged on both sides of each of the rotating nozzles.

[0013] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that the rotating drum and the unit pipeline are connected via a pipe joint, and a sealing ring is also provided between the pipe joint and the rotating drum.

[0014] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that the pipe joint includes an upper joint and a lower joint, the top end of the rotating drum is connected to the unit pipeline through the upper joint, and the bottom end of the rotating drum is connected to the unit pipeline through the lower joint.

[0015] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that the rotary nozzle also includes a bushing sleeved on the outer wall of the rotating drum, two bearings connected to the rotating drum and located at both ends of the bushing, and a fixed joint connected to the two bearings, a fixed seat is arranged between the fixed joint and the rotating drum, and the outer shell is connected to the fixed joint.

[0016] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that the impeller comprises an inner ring, a plurality of blades fixed to the inner ring at intervals, and an outer ring connected to the inner ring, the blades are located between the inner ring and the outer ring, a set gap is provided between the inner ring and the outer wall of the central pipe, and the outer ring is fixedly connected to the outer shell;

[0017] The blades are pushed by high-pressure cleaning fluid to drive the blades to rotate, thereby driving the shell to rotate around the central tube.

[0018] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that the blades are spiral-shaped.

[0019] A further improvement of the screen cleaning device for coalbed methane wells of the present invention is that a plurality of nozzle holes are arranged at intervals, and nozzles are arranged at the nozzle holes.

[0020] The screen pipe cleaning device for coalbed methane wells of the present invention is provided with a centralizer, so that the rotary nozzle can remain stable during the rotation process, avoiding collision between the rotary nozzle and the screen pipe, avoiding rupture of the rotary nozzle and the screen pipe, and improving the structural stability of the screen pipe and the rotary nozzle. By providing a rotating drum, a center drum, an outer shell and an impeller, the impeller is pushed by high-pressure cleaning fluid to drive the outer shell to rotate, so that the high-pressure cleaning fluid can be evenly sprayed on the inner wall of the screen pipe, thereby improving the cleaning efficiency of the screen pipe.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a cross-sectional view of a screen cleaning device for a coalbed methane well provided by the present invention.

[0024] Figure 2 It is a schematic diagram of a centralizer in a screen cleaning device for a coalbed methane well provided by the present invention.

[0025] Figure 3 It is a half-section view of a rotary nozzle in a screen pipe cleaning device for a coalbed methane well provided by the present invention.

[0026] Figure 4 It is a half-section schematic diagram of a rotary nozzle in a screen pipe cleaning device for a coalbed methane well provided by the present invention.

[0027] Figure 5 It is a schematic diagram of an impeller in a screen cleaning device for a coalbed methane well provided by the present invention.

[0028] Reference numerals:

[0029] 1. Conversion joint; 2. Screen tube; 3. Stabilizer; 4. Rotating nozzle; 41. Upper joint; 42. Rotating drum; 43. Fixed joint; 44. Bearing; 45. Bushing; 46. Housing; 461. Nozzle hole; 47. Impeller; 471. Outer ring; 472. Blades; 473. Inner ring; 48. Center tube; 481. Liquid inlet hole; 49. Lower joint; 5. Connecting pipe; 6. Plug. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0031] Combine the following Figure 1 The screen cleaning device for coalbed methane well of the present invention comprises:

[0032] A conversion joint 1, the top end of which is connected to a fixed valve joint, and a screen tube 2 is inserted into the bottom end of the conversion joint 1;

[0033] A connecting pipe 5, the connecting pipe 5 is connected to the conversion joint 1 and is located in the screen pipe 2, and the connecting pipe 5 includes a plurality of unit pipes;

[0034] A centralizer 3, which is connected between two adjacent unit pipes. The centralizer 3 includes two centralizer ring pipes and a plurality of arc-shaped pipes connected to the two centralizer ring pipes and in an arc shape. The arc-shaped pipes can be made of elastic material, such as rubber;

[0035] The rotating spray head 4 is connected between two adjacent unit pipes. The rotating spray head 4 includes a rotating drum 42 connected to the corresponding unit pipe, a central pipe 48 connected to the inner wall of the rotating drum 42, a shell 46 rotatably connected to the outer wall of the rotating drum 42, and an impeller 47 connected to the side of the shell 46 close to the central pipe 48. The central pipe 48 is provided with a liquid inlet hole 481, and the shell 46 is provided with a nozzle hole 461;

[0036] The high-pressure cleaning liquid enters the conversion joint 1, flows through the connecting pipe 5 and the centralizer 3, and then enters the rotating nozzle 4, so that the high-pressure cleaning liquid enters between the central tube 48 and the outer shell 46 from the liquid inlet hole 481, and then the high-pressure cleaning liquid drives the impeller 47 to rotate, thereby driving the outer shell 46 to rotate, so that the high-pressure cleaning liquid is sprayed outward from the nozzle hole 461 to clean the screen pipe 2.

[0037] In a preferred embodiment of the present invention, the screen pipe 2 cleaning device for coalbed methane wells is as follows: Figure 1 As shown, the conversion joint 1 includes a head and a tail. An inner channel is opened in the conversion joint 1, and the inner channel is used to communicate with the fixed valve joint and the screen pipe 2.

[0038] Preferably, four inner channels are arranged at intervals to facilitate the connection between the fixed valve and the screen tube 2 .

[0039] Specifically, a guide hole is opened in the middle of the conversion joint 1, and a guide interface is opened on the side wall of the conversion joint 1 corresponding to the guide hole. The position of the conversion joint 1 corresponding to the guide hole protrudes downward to form a connecting boss, and the connecting pipe 5 is connected to the connecting boss. The high-pressure cleaning fluid is introduced into the guide hole through the guide interface.

[0040] Preferably, the connecting pipe 5 and the connecting boss are connected by interference fit, thereby improving the connection stability between the connecting pipe 5 and the connecting boss.

[0041] Preferably, a pressure switch may be provided at the flow guide interface. When the screen tube 2 is cleaned, the pressure switch may be operated to allow the cleaning fluid to flow into the conversion joint 1 through the flow guide interface.

[0042] Furthermore, if Figure 1 and Figure 2 As shown, centralizers 3 are provided on both sides of each rotary nozzle 4 to guide the high-pressure cleaning liquid to flow into the rotary nozzle 4 to ensure that the high-pressure cleaning liquid can be smoothly transmitted and utilized, thereby ensuring the efficiency and effect of the screen pipe 2 cleaning operation. The centralizer 3 can ensure that the screen pipe 2 cleaning device is in the correct position to prevent it from shifting, and can also reduce the vibration generated by the rotary nozzle 4 when cleaning the screen pipe 2.

[0043] Preferably, the centralizer 3 may also be two pipe hoops provided on the connecting pipe 5 and an arc rod connected between the two pipe hoops, and the arc rod is used to reduce the vibration generated by the rotating nozzle 4 when cleaning the screen pipe 2.

[0044] Furthermore, if Figure 3 and Figure 4 As shown, the rotating drum 42 and the unit pipeline are connected via a pipe joint, and a sealing ring is also provided between the pipe joint and the rotating drum 42.

[0045] Specifically, the pipe joint includes an upper joint 41 and a lower joint 49 . The top end of the rotating drum 42 is connected to the unit pipeline through the upper joint 41 , and the bottom end of the rotating drum 42 is connected to the unit pipeline through the lower joint 49 .

[0046] Preferably, the top end of the upper joint 41 forms an upper plug-in section, and the bottom end of the lower joint 49 forms a lower plug-in section, so that the unit pipe corresponding to the upper joint 41 is plugged into the upper plug-in section, and the unit pipe corresponding to the lower joint 49 is sleeved into the lower plug-in section, thereby preventing the high-pressure cleaning fluid from flushing open the upper joint 41 and the unit pipe and preventing the lower joint 49 and the unit pipe from flushing open, thereby improving the connection stability between the rotating nozzle 4 and the connecting pipe 5.

[0047] Preferably, the bottom end of the connecting pipe 5 is connected to the screw plug 6, and the unit pipes can be connected through flanges.

[0048] Specifically, Figure 3 and Figure 4As shown, the rotary nozzle 4 also includes a bushing 45 sleeved on the outer wall of the rotating drum 42, two bearings 44 connected to the rotating drum 42 and located at both ends of the bushing 45, and a fixing joint 43 connected to the two bearings 44, a fixing seat is arranged between the fixing joint 43 and the rotating drum 42, and the outer shell 46 is connected to the fixing joint 43.

[0049] When the high-pressure cleaning liquid enters the central tube 48, it enters the gap between the central tube 48 and the outer shell 46 through the liquid inlet hole 481, and drives the impeller 47 to rotate, thereby driving the outer shell 46, the bearing 44, the fixed joint 43 and the fixed seat to rotate synchronously.

[0050] Preferably, the fixing seat and the fixing joint 43 are connected by bolts.

[0051] Furthermore, if Figure 3 , Figure 4 and Figure 5 As shown, the impeller 47 includes an inner ring 473, a plurality of blades 472 fixed to the inner ring 473 at intervals, and an outer ring 471 connected to the inner ring 473, the blades 472 are located between the inner ring 473 and the outer ring 471, a set gap is provided between the inner ring 473 and the outer wall of the center tube 48, and the outer ring 471 is fixedly connected to the housing 46;

[0052] The blades 472 are pushed by the high-pressure cleaning fluid to drive the blades 472 to rotate, thereby driving the housing 46 to rotate around the central tube 48.

[0053] Preferably, the blades are spiral-shaped.

[0054] Preferably, the set gap can be 1mm, 2mm, 3mm, etc.

[0055] Preferably, a reinforcement section is formed on the side of the outer ring 471 close to the outer casing 46 , and the reinforcement section is fixedly connected to the outer casing. The reinforcement section improves the connection strength between the impeller 47 and the outer casing 46 .

[0056] Preferably, the impeller 47 drives the housing 46 to rotate 360° inside the screen tube 2, thereby ensuring that the entire inner surface of the screen tube 2 can be fully cleaned.

[0057] Furthermore, a plurality of nozzle holes 461 are arranged at intervals, and nozzles are arranged at the nozzle holes 461 .

[0058] Preferably, the diameter of the nozzle hole 461 can be set correspondingly according to the inner diameter of the screen tube 2, so as to ensure that the nozzle can spray the cleaning liquid normally.

[0059] Preferably, the number of the rotating nozzles 4 can be selected according to the height of the screen pipe 2 .

[0060] In a specific implementation of the present invention, when the screen tube 2 needs to be cleaned, the pressure switch is operated to make the high-pressure cleaning liquid flow into the conversion joint 1 through the diversion interface, and then enter the center tube 48 through the connecting pipe 5 and the stabilizer 3, and then the high-pressure cleaning liquid enters the gap between the center tube 48 and the outer shell 46 through the liquid inlet hole 481. At this time, the high-pressure cleaning liquid drives the impeller 47 to rotate, thereby driving the outer shell 46, the bearing 44, the fixed joint 43 and the fixed seat to rotate synchronously. At the same time, the cleaning liquid between the center tube 48 and the outer shell 46 can be sprayed outward from the nozzle connected to the nozzle hole 461 to fully clean the screen tube 2.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screen cleaning device for a coalbed methane well, characterized in that: include: A conversion joint, the top end of which is connected to a fixed valve joint, and a screen tube is inserted into the bottom end of the conversion joint; A connecting pipe, the connecting pipe is connected to the conversion joint and is located in the screen pipe, and the connecting pipe includes a plurality of unit pipes; A centralizer, the centralizer is connected between two adjacent unit pipes, and the centralizer includes two centralizing ring pipes and a plurality of arc-shaped pipes connected to the two centralizing ring pipes and in an arc shape; A rotating spray head, the rotating spray head is connected between two adjacent unit pipes, the rotating spray head comprises a rotating drum connected to the corresponding unit pipe, a central pipe connected to the inner wall of the rotating drum, a shell rotatably connected to the outer wall of the rotating drum, and an impeller connected to the side of the shell close to the central pipe, the central pipe is provided with a liquid inlet hole, and the shell is provided with a nozzle hole; The high-pressure cleaning liquid enters the conversion joint, flows through the connecting pipe and the centralizer, and then enters the rotating nozzle, so that the high-pressure cleaning liquid enters between the central tube and the outer shell from the liquid inlet hole, and then the high-pressure cleaning liquid drives the impeller to rotate, thereby driving the outer shell to rotate, so that the high-pressure cleaning liquid is sprayed outward from the nozzle hole to clean the screen tube; The impeller comprises an inner ring, a plurality of blades fixed to the inner ring at intervals, and an outer ring connected to the inner ring, wherein the blades are located between the inner ring and the outer ring, and the blades are spiral-shaped, a set gap is provided between the inner ring and the outer wall of the central tube, and the outer ring is fixedly connected to the outer shell; The blades are pushed by high-pressure cleaning fluid to drive the blades to rotate, thereby driving the shell to rotate around the central tube.

2. The screen cleaning device for coalbed methane well according to claim 1, characterized in that: The conversion joint comprises a head portion and a tail portion. An inner channel is provided in the conversion joint. The inner channel is used to communicate with the fixed valve joint and the screen pipe.

3. The screen cleaning device for coalbed methane well according to claim 2, characterized in that: A guide hole is provided in the middle of the conversion joint, a guide interface is provided on the side wall of the conversion joint corresponding to the guide hole, the conversion joint protrudes downward at the position corresponding to the guide hole to form a connecting boss, the connecting pipe is connected to the connecting boss, and the high-pressure cleaning fluid is introduced into the guide hole through the guide interface.

4. The screen cleaning device for coalbed methane well according to claim 1, characterized in that: The centralizers are arranged on both sides of each of the rotating nozzles.

5. The screen cleaning device for coalbed methane well according to claim 1, characterized in that: The rotating drum and the unit pipeline are connected via a pipe joint, and a sealing ring is also provided between the pipe joint and the rotating drum.

6. The screen cleaning device for coalbed methane well according to claim 5, characterized in that: The pipe joint includes an upper joint and a lower joint. The top end of the rotating drum is connected to the unit pipeline through the upper joint, and the bottom end of the rotating drum is connected to the unit pipeline through the lower joint.

7. The screen cleaning device for coalbed methane well according to claim 1, characterized in that: The rotary spray head also includes a bushing sleeved on the outer wall of the rotating drum, two bearings connected to the rotating drum and located at both ends of the bushing, and a fixing joint connected to the two bearings, a fixing seat is arranged between the fixing joint and the rotating drum, and the outer shell is connected to the fixing joint.

8. The screen cleaning device for coalbed methane well according to claim 1, characterized in that: A plurality of nozzle holes are arranged at intervals, and nozzles are arranged at the nozzle holes.

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