Special anti-blocking filter sieve tube for drainage and mining of coal-bed gas well

Abstract

The anti-blocking filter screen pipe special for coal-bed gas well drainage and mining comprises a screen pipe body, a screen mechanism and a cleaning mechanism, the screen mechanism is arranged in the screen pipe body and comprises a large filter screen, a middle filter screen, a small filter screen and two connecting plates, and the large filter screen, the middle filter screen, the small filter screen and the two connecting plates are arranged on the screen pipe body. The cleaning mechanism comprises a driving assembly, a cleaning assembly, a sweeping assembly and two locking assemblies, the cleaning assembly is rotationally arranged in the screen pipe body, and the cleaning assembly is connected with the driving assembly; the sweeping assembly is slidably arranged in the screen pipe body. The two locking assemblies are fixedly arranged on the cleaning assembly. One purpose of the utility model is to provide the special anti-blocking filter screen pipe for drainage and mining of the coal-bed gas well, and the function of timely self-cleaning the screen pipe due to the fact that the conical filter screen is matched with the cleaning mechanism is realized. By means of the mechanism, accumulation on the screen pipe can be removed irregularly, the blocking phenomenon of the screen pipe is effectively prevented, and it is guaranteed that mining operation is continuously and efficiently carried out.

Description

Technical Field

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

[0002] Coalbed methane, a precious mineral resource associated with coal, is primarily composed of methane and is an essential high-quality fuel for industry, chemical production, power generation, and daily life. The extraction process involves reducing the pressure of the coal reservoir, allowing the methane to desorb from the surface of the coal matrix. The methane then diffuses through a complex network of pores and fractures and seeps into the wellbore. However, this process often involves the extraction of coal ash, large particles, and other impurities.

[0003] Currently, existing mining processes use filter screens to remove coal ash, large particles, and other impurities. However, most screens are not designed to prevent clogging. Consequently, over extended periods of use, these screens can easily become clogged due to the accumulation of impurities. This can lead to interruptions in mining operations, requiring the screens to be removed for cleaning and maintenance, impacting the efficiency and progress of coalbed methane extraction. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent.

[0005] To this end, one purpose of the present invention is to propose a special anti-blocking filter screen for coalbed methane well drainage. By setting a conical filter screen and a cleaning mechanism, it not only ensures efficient stratification and filtration of coal ash, large particles and other impurities, but also realizes timely cleaning of the screen blockage problem.

[0006] This mechanism can remove the accumulation on the screen pipe from time to time, effectively preventing the screen pipe from being blocked, thereby greatly avoiding the obstruction of coalbed methane mining progress caused by screen pipe blockage, and ensuring the continuous and efficient progress of mining operations.

[0007] To achieve the above-mentioned object, the first aspect of the present invention proposes a special anti-blocking filter screen for coalbed methane well drainage, comprising a screen body, a screen mechanism and a cleaning mechanism, wherein the screen mechanism is arranged in the screen body, and the screen mechanism includes a large filter, a medium filter, a small filter and two connecting plates, wherein the large filter is arranged at the bottom of the screen body and is fixedly connected to the screen body; the two connecting plates are fixedly arranged on the large filter; the medium filter and the small filter are both conical filter screens, and the medium filter and the small filter are arranged in sequence in the screen body, and the medium filter and the small filter are fixedly connected to the two connecting plates; the cleaning mechanism includes a driving assembly, a cleaning assembly, a sweeping assembly and two locking assemblies, wherein the cleaning assembly is rotatably arranged in the screen body and the cleaning assembly is connected to the driving assembly; the sweeping assembly is slidably arranged in the screen body; the two locking assemblies are fixedly arranged on the sweeping assembly, and the screen body is provided with a hole for the locking assembly to slide.

[0008] In addition, the anti-blocking filter screen pipe for coalbed methane well drainage proposed in the present invention may also have the following additional technical features:

[0009] Specifically, the drive assembly includes a fixed box, a driving component and a transmission component, wherein the fixed box is fixedly arranged on the outside of the screen tube body; the driving component is arranged in the fixed box; the transmission component is connected to the driving component, and the transmission component includes a rotating shaft and an active bevel gear, wherein the rotating shaft passes through the screen tube body and is connected to the output end of the driving component; the active bevel gear is fixed on the rotating shaft.

[0010] Specifically, the cleaning assembly includes a rotating rod, a driven bevel gear and a plurality of cleaning blades, wherein the rotating rod passes through the large filter screen and is rotatably arranged in the screen tube body; the driven bevel gear is fixedly arranged at one end of the rotating rod, and the driven bevel gear is meshed with the driving bevel gear; the plurality of cleaning blades are respectively fixedly arranged on the rotating rod, and the plurality of cleaning blades are closely attached to the medium filter screen and the small filter screen.

[0011] Specifically, the cleaning assembly includes two cleaning plates, two connecting rods and two connecting blocks, wherein the two cleaning plates are slidably arranged in the screen tube body, and the two cleaning plates are respectively close to the bottom of the middle filter screen and the small filter screen, the two connecting rods are respectively fixedly arranged on the two cleaning plates, and the two connecting blocks are respectively fixedly arranged on the top of the two connecting rods.

[0012] Specifically, the locking assembly includes a hollow slider, a solid slider and a spring, wherein the hollow slider is fixedly arranged on the connecting block; a first sliding groove is opened inside the hollow slider, the solid slider is slidably arranged in the first sliding groove, and the solid slider is connected to the hollow slider through the spring.

[0013] Compared with the existing technology, the utility model has the following beneficial effects: the utility model is a special anti-blocking filter screen for coalbed methane well drainage, which is equipped with a conical filter screen and a cleaning mechanism. The conical filter screen fits the cleaning mechanism, which not only ensures efficient stratification and filtration of coal ash, large particles and other impurities, but also realizes timely cleaning of the screen blockage problem. This mechanism can remove the accumulation on the screen tube from time to time, effectively preventing the blockage of the screen tube, thereby greatly avoiding the obstruction of the coalbed methane mining progress due to the blockage of the screen tube, and ensuring the continuous and efficient mining operation. In addition, the cleaning mechanism can be slid and removed, which is convenient for users to remove accumulated impurities from time to time, and the inner wall of the screen tube can also be thoroughly cleaned and maintained during the removal process.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0016] Figure 1 This is a structural diagram of a special anti-blocking filter screen for coalbed methane well drainage according to the utility model;

[0017] Figure 2 This is a schematic diagram of the expansion of the anti-blocking filter screen pipe specially used for coalbed methane well drainage according to the utility model. Figure 1 ;

[0018] Figure 3 This is a schematic diagram of the expansion of the anti-blocking filter screen pipe specially used for coalbed methane well drainage according to the utility model. Figure 2 ;

[0019] Figure 4 It is a schematic diagram of the structure of the screen mechanism according to the utility model;

[0020] Figure 5 It is a structural schematic diagram of the cleaning mechanism according to the utility model;

[0021] Figure 6 It is a structural schematic diagram of the driving component and the cleaning component according to the utility model.

[0022] Figure 7It is a structural schematic diagram of the cleaning component according to the utility model.

[0023] Figure 8 It is a structural schematic diagram of the locking assembly according to the utility model.

[0024] Figure numerals: 1. Screen tube body; 2. Screen mechanism; 21. Large filter; 22. Medium filter; 23. Small filter; 24. Connecting plate; 3. Cleaning mechanism; 31. Driving assembly; 311. Fixing box; 312. Driving component; 313. Transmission component; 3131. Rotating shaft; 3132. Active bevel gear; 32. Cleaning assembly; 321. Rotating rod; 322. Driven bevel gear; 323. Cleaning blades; 33. Cleaning assembly; 331. Cleaning plate; 332. Connecting rod; 333. Connecting block; 34. Locking assembly; 341. Hollow slider; 342. Solid slider; 343. Spring. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] The following describes an anti-blocking filter screen specially used for coalbed methane well drainage and production according to an embodiment of the present invention with reference to the accompanying drawings.

[0027] In one embodiment of the present invention, Figures 1-8 As shown, it includes a screen tube body 1, a screen mechanism 2 and a cleaning mechanism 3.

[0028] The screen mechanism 2 is disposed in the screen tube body 1 , and the screen mechanism 2 includes a large filter 21 , a medium filter 22 , a small filter 23 and two connecting plates 24 .

[0029] Among them, the large filter screen 21 is arranged at the bottom of the screen tube body 1, and the large filter screen 21 is fixedly connected to the screen tube body 1, and two connecting plates 24 are fixedly arranged on the large filter screen 21, and the medium filter screen 22 and the small filter screen 23 are both conical filter screens. The medium filter screen 22 and the small filter screen 23 are arranged in the screen tube body 1 in sequence, and the medium filter screen 22 and the small filter screen 23 are fixedly connected to the two connecting plates 24.

[0030] The cleaning mechanism 3 includes a driving assembly 31 , a cleaning assembly 32 , a sweeping assembly 33 and two locking assemblies 34 .

[0031] Among them, the cleaning component 32 is rotatably arranged in the screen tube body 1, and the cleaning component 32 is connected to the driving component 31, the cleaning component 33 is slidably arranged in the screen tube body 1, two locking components 34 are fixedly arranged on the cleaning component 33, and the screen tube body is provided with a hole for the locking component to slide.

[0032] It should be noted that existing mining processes use filter screens to remove coal ash, large particles, and other impurities, but most screens are not designed to prevent clogging. For example, after each pump inspection, restoring a coalbed methane well to its previous production level can take as little as a month or as long as three months. During this period, the average monthly production cost per well is approximately 20,000 yuan. If the coalbed methane screens lack the necessary anti-clogging function, operations must be suspended for cleaning, which undoubtedly results in a double loss of time and financial costs.

[0033] Specifically, when the screen body 1 needs to be cleaned, the driving component 31 is operated, and the driving component 31 drives the cleaning component 32 to operate, which can clean the coal ash, particles and other impurities on the medium filter screen 22 and the small filter screen 23. Since the medium filter screen 22 and the small filter screen 23 are conical, some impurities will fall into the well through the filter screen, and some will enter the cleaning plate 331.

[0034] When it is necessary to clean the impurities of the cleaning component 33, lightly press the locking component 34 so that the cleaning component 33 can slide freely inside the screen tube body 1, making it easy to remove and install. In addition, the cleaning component 33 will also clean the inner wall of the screen tube body 1 during the sliding process.

[0035] In one embodiment of the present invention, Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, the driving assembly 31 includes a fixing box 311 , a driving component 312 and a transmission component 313 .

[0036] The fixing box 311 is fixedly arranged on the outside of the screen tube body 1 , and the driving component 312 is arranged inside the fixing box 311 .

[0037] The transmission component 313 is connected to the driving component 312 , and the transmission component 313 includes a rotating shaft 3131 and a driving bevel gear 3132 .

[0038] The rotating shaft 3131 passes through the screen tube body 1 , and is connected to the output end of the driving component 312 . The driving bevel gear 3132 is fixedly disposed on the rotating shaft 3131 .

[0039] Specifically, the driving component 312 is operated to drive the rotating shaft 3131 to rotate, and the driving bevel gear 3132 fixedly connected to the rotating shaft 3131 also starts to rotate.

[0040] In one embodiment of the present invention, Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, the cleaning assembly 32 includes a rotating rod 321 , a driven bevel gear 322 and a plurality of cleaning blades 323 .

[0041] Among them, the rotating rod 321 passes through the large filter 21 and is rotatably set in the screen tube body 1, the driven bevel gear 322 is fixedly set at one end of the rotating rod 321, and the driven bevel gear 322 is engaged with the driving bevel gear 3132, and the multiple cleaning blades 323 are respectively fixed on the rotating rod 321, and the multiple cleaning blades 323 are close to the medium filter 22 and the small filter 23.

[0042] Specifically, the rotating active bevel gear 3132 drives the driven bevel gear 322 engaged with it to start rotating, and the rotating rod 321 rotates to drive the multiple cleaning blades 323 to rotate. Since the cleaning blades 323 are tightly attached to the medium filter 22 and the small filter 23 respectively, they can clean impurities such as coal ash and particles on the medium filter 22 and the small filter 23.

[0043] In one embodiment of the present invention, Figure 1 、 Figure 2 、 Figure 3 and Figure 7 As shown, the cleaning assembly 33 includes two cleaning plates 331 , two connecting rods 332 and two connecting blocks 333 .

[0044] Among them, the two cleaning plates 331 are slidably arranged in the screen tube body 1, and the two cleaning plates 331 are respectively close to the bottom of the middle filter screen 22 and the small filter screen 23, the two connecting rods 332 are fixedly arranged on the two cleaning plates 331, and the two connecting blocks 333 are respectively fixedly arranged on the top of the two connecting rods 332.

[0045] Specifically, impurities such as soot and particles are cleaned from the middle filter 22 and the small filter 23. Since the middle filter 22 and the small filter 23 are conical, some impurities fall into the well through the filter, while others enter the cleaning plate 331. When the screen tube body 1 needs to be cleaned regularly, the cleaning plate 331 can be slid out for cleaning, and the cleaning plate 331 also cleans the inner wall of the screen tube body 1 during the sliding process.

[0046] In one embodiment of the present invention, Figure 1 、 Figure 2 、 Figure 3 and Figure 8 As shown, the locking assembly 34 includes a hollow slider 341 , a solid slider 342 and a spring 343 .

[0047] The hollow slider 341 is fixed on the connecting block 333 , a first sliding groove is provided inside the hollow slider 341 , the solid slider 342 is slidably provided in the first sliding groove, and the solid slider 342 is connected to the hollow slider 341 via a spring 343 .

[0048] Specifically, lightly press the solid slider 342, and after the spring 343 connected to the solid slider 342 is pressed, the solid slider 342 will slide inside the hollow slider 341, so that the cleaning plate 331 can slide freely inside the screen tube body 1, which is convenient for removal and installation.

[0049] Specifically, when the screen tube body 1 needs to be cleaned, the driving component 312 is operated to drive the rotating shaft 3131 to rotate, and the active bevel gear 3132 fixedly connected to the rotating shaft 3131 also starts to rotate. The rotating active bevel gear 3132 drives the driven bevel gear 322 meshed with it to start rotating. The rotation of the rotating rod 321 drives the multiple cleaning blades 323 to rotate. Since the cleaning blades 323 are respectively in close contact with the middle filter screen 22 and the small filter screen 23, they can clean impurities such as coal ash and particles on the middle filter screen 22 and the small filter screen 23. Since the middle filter screen 22 and the small filter screen 23 are conical, some impurities will fall into the well through the filter screen, and some will enter the cleaning plate 331.

[0050] When it is necessary to clean impurities in the cleaning assembly 33, lightly press the solid slider 342. After the spring 343 connected to the solid slider 342 is pressed, the solid slider 342 will slide inside the hollow slider 341, so that the cleaning plate 331 can slide freely inside the screen tube body 1, which is convenient for removal and installation. In addition, the cleaning plate 331 will also clean the inner wall of the screen tube body 1 during the sliding process.

[0051] In summary, the utility model of the anti-blocking filter screen pipe for coalbed methane well drainage and production, by setting a conical filter screen and a cleaning mechanism, the conical filter screen fits the cleaning mechanism, which not only ensures the efficient filtration of coal ash, large particles and other impurities in layers, but also realizes timely self-cleaning of the screen pipe blockage problem. This mechanism can remove the accumulation on the screen pipe from time to time, effectively preventing the blockage of the screen pipe, thereby greatly avoiding the obstruction of the coalbed methane mining progress due to the blockage of the screen pipe, and ensuring the continuous and efficient progress of the mining operation. In addition, the cleaning mechanism can be slid and removed, which is convenient for the user to remove the accumulated impurities from time to time, and the inner wall of the screen pipe can also be thoroughly cleaned and maintained during the removal process.

[0052] In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. Anti-blocking filter screen pipe for coalbed methane well drainage, characterized by: It includes a screen tube body, a screen mechanism and a cleaning mechanism, wherein: The screen mechanism is arranged in the screen tube body, and the screen mechanism includes a large filter, a medium filter, a small filter and two connecting plates, wherein: The large filter is arranged at the bottom of the sieve tube body, and the large filter is fixedly connected to the sieve tube body; The two connecting plates are fixedly arranged on the large filter net; The middle filter and the small filter are both conical filter screens, and are sequentially arranged in the sieve tube body, and are both fixedly connected to the two connecting plates; The cleaning mechanism includes a driving component, a cleaning component, a sweeping component and two locking components, wherein: The cleaning assembly is rotatably disposed in the screen tube body, and the cleaning assembly is connected to the driving assembly; The cleaning assembly is slidably disposed in the screen tube body; The two locking assemblies are fixedly arranged on the cleaning assembly, and the screen tube body is provided with holes for the locking assemblies to slide.

2. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 1 is characterized in that: The driving assembly includes a fixing box, a driving component and a transmission component, wherein: The fixing box is fixedly arranged on the outside of the screen tube body; The driving component is arranged in the fixing box; The transmission component is connected to the driving component, and the transmission component includes a rotating shaft and a driving bevel gear, wherein, The rotating shaft passes through the screen tube body, and the rotating shaft is connected to the output end of the driving component; The driving bevel gear is fixedly arranged on the rotating shaft.

3. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 2 is characterized in that: The cleaning assembly includes a rotating rod, a driven bevel gear and a plurality of cleaning blades, wherein: The rotating rod passes through the large filter screen and is rotatably arranged in the screen tube body; The driven bevel gear is fixedly arranged at one end of the rotating rod, and the driven bevel gear is meshed with the driving bevel gear; The plurality of cleaning blades are respectively fixedly arranged on the rotating rod, and the plurality of cleaning blades are closely attached to the middle filter screen and the small filter screen.

4. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 3 is characterized in that: The cleaning assembly includes two cleaning plates, two connecting rods and two connecting blocks, wherein: The two cleaning plates are slidably arranged in the screen tube body, and the two cleaning plates are respectively closely attached to the bottom of the middle filter screen and the small filter screen; The two connecting rods are respectively fixedly arranged on the two cleaning plates; The two connecting blocks are respectively fixedly arranged on the tops of the two connecting rods.

5. The anti-blocking filter screen pipe for coalbed methane well drainage according to claim 4 is characterized in that: The locking assembly includes a hollow slider, a solid slider and a spring, wherein: The hollow slider is fixedly arranged on the connecting block; A first sliding groove is provided inside the hollow slider, the solid slider is slidably arranged in the first sliding groove, and the solid slider is connected to the hollow slider via the spring.

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