Efficient pressure-stabilizing coal bed gas drainage and mining device

Abstract

The invention discloses an efficient pressure-stabilizing coal bed gas drainage and mining device, which relates to the technical field of coal bed gas drainage and mining, and comprises a drainage and mining cylinder, a pressure-stabilizing device, a pressure-stabilizing device, a pressure-stabilizing device, a pressure-stabilizing device, a pressure-stabilizing device, a pressure-stabilizing device and a pressure-stabilizing device, the extraction holes are distributed in the side portion of the extraction cylinder, the extraction holes penetrate through the extraction cylinder in the radial direction, and the extraction holes are close to the closed end of the extraction cylinder; the filter screen is fixedly arranged in the extraction hole; the pressure stabilizing assembly is arranged outside the extraction cylinder, corresponds to the extraction hole and is used for covering the filter screen in a densified mode in the drainage and pressure reduction stage and removing dust on the filter screen regularly in the negative pressure suction stage, and the device is flexible in working mode and capable of achieving pressure stabilizing extraction.

Description

Technical Field

[0001] The present invention relates to the technical field of coalbed methane drainage, and in particular to a coalbed methane high-efficiency pressure-stabilizing drainage device. Background Art

[0002] As a clean energy source, the efficient development of coalbed methane is of great significance to optimizing the energy structure and reducing greenhouse gas emissions. During the coalbed methane extraction process, it is crucial to maintain a stable extraction pressure. Traditional extraction equipment usually uses a fixed filter structure to filter coal powder, and it is impossible to adjust the filtration performance in real time according to the extraction conditions. For example, in the early drainage and pressure reduction stage, a large amount of coalbed methane is desorbed, causing pressure fluctuations in the extraction tube; and in the later negative pressure extraction stage, when the filter is blocked, the machine needs to be frequently shut down for manual cleaning or replacement of the filter element, resulting in poor continuity of the extraction operation and also affecting the stability of the pressure in the extraction tube.

[0003] Therefore, it is necessary to provide a coalbed methane high-efficiency pressure-stabilizing drainage device to solve the above problems. Summary of the Invention

[0004] To solve the above problems, the present invention provides the following technical solution: a coalbed methane high-efficiency pressure-stabilizing drainage device, comprising:

[0005] An extraction cylinder, one end of which is a closed end and the other end of which is connected to a buffer cylinder;

[0006] a plurality of extraction holes distributed on the side of the extraction tube, wherein the extraction holes radially penetrate the extraction tube and are close to the closed end of the extraction tube;

[0007] a filter screen fixedly arranged in the extraction hole;

[0008] The pressure stabilizing component is arranged outside the extraction tube and corresponds to the extraction hole, and is used to increase the density of the filter screen during the drainage and pressure reduction stage, and to regularly remove dust from the filter screen during the negative pressure suction stage.

[0009] Optionally, the voltage stabilizing component includes:

[0010] An outer cylinder is coaxially sleeved on the outside of the extraction cylinder with intervals, and one end of the outer cylinder is sealed with the extraction cylinder and the other end is an open end;

[0011] Two coaxially symmetrically arranged rails, the two rails being connected to the inner wall of the outer cylinder via a connecting seat;

[0012] Two movable pressure stabilizing devices, each of which is supported by two rails, and can move along the rails and act on the filter;

[0013] A direction-changing space is defined between the outer tube and the extraction tube.

[0014] Optionally, the mobile voltage stabilizing device includes:

[0015] Two track seats are respectively provided corresponding to the two tracks, and an outer wheel body and an inner wheel body are rotatably provided on the track seats, wherein the inner wheel body is engaged with the track, and the outer wheel body is in sliding contact with the track;

[0016] A dust removal assembly comprising:

[0017] A base plate, supported by the two rail seats;

[0018] The driver is arranged on the substrate, and a disk is arranged at the output end of the driver, and bristles are arranged on the surface of the disk.

[0019] Optionally, the driver in one of the mobile voltage stabilizing devices is a motor, and the driver in the other mobile voltage stabilizing device is a self-vibrator.

[0020] Optionally, a filter-enhancing component is also provided on one side of the substrate of each mobile voltage-stabilizing device. When the two mobile voltage-stabilizing devices move in the same direction, the filter is dusted by the dust removal component; when the two mobile voltage-stabilizing devices move in opposite directions, the filter is densely covered by the filter-enhancing component.

[0021] Optionally, the filtration enhancement component includes:

[0022] A winding drum, in which a rotating drum is rotatably arranged;

[0023] A filtration belt, one end of which is wound around the rotating drum and the other end of which extends out of the winding drum;

[0024] The ends of the filtration bands of the two filtration-increasing components are connected to each other.

[0025] Optionally, the filtration accuracy parameters of the filtration belts of the two filtration enhancement components are different.

[0026] Optionally, a drainage hole is provided at the bottom of the winding drum, and a water spray head is installed on the inner wall of the winding drum.

[0027] Optionally, a buffer plate is slidably provided in the buffer cylinder, and an elastic member is connected between the buffer plate and the buffer cylinder.

[0028] Compared with the prior art, the present invention provides a high-efficiency, pressure-stabilized coalbed methane drainage device, which has the following beneficial effects:

[0029] In the present invention, the pressure stabilizing component implements dense coverage on the filter screen during the drainage and pressure reduction phase, forming a dense filter layer by reducing the porosity of the filter screen. This can cope with the large-scale precipitation of coalbed methane during the drainage and pressure reduction phase and maintain stable pressure in the extraction tube.

[0030] In this invention, during the negative pressure suction phase, the pressure stabilization component switches to dust removal mode, employing a dual-mode system of rotary sweeping and micro-vibration. The rotating bristles remove dust from the filter surface through continuous mechanical contact, while the vibration excitation disrupts the adsorption of coal dust, achieving deep clearing. This integrated design restores filter permeability without the need for an additional backflush system, ensuring stable pressure within the extraction tube.

[0031] In the present invention, the redirecting space formed by the outer tube and the extraction tube has three functions: after the dust-laden airflow enters, gas-solid separation is achieved through inertial collision, and the coal dust settles along the redirecting space; the outer tube serves as a straightening tube embedded in the well wall to enhance the stability of the device; the outer tube serves as the installation base of the pressure stabilizing component, and can provide certain protection for the mobile pressure stabilizing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the main structure of a high-efficiency, pressure-stabilizing coalbed methane drainage device;

[0033] Figure 2 This is a schematic cross-sectional view of a high-efficiency, pressure-stabilizing coalbed methane drainage device;

[0034] Figure 3 This is a schematic diagram of the three-dimensional structure of a coalbed methane high-efficiency pressure-stabilizing drainage and production device;

[0035] Figure 4 This is a schematic diagram of the three-dimensional structure of a pressure stabilizing component in a coalbed methane high-efficiency pressure stabilizing drainage device;

[0036] Figure 5 A schematic diagram of the three-dimensional half-section structure of a pressure stabilizing component in a coalbed methane high-efficiency pressure stabilizing drainage device Figure 1 ;

[0037] Figure 6 A schematic diagram of the three-dimensional half-section structure of a pressure stabilizing component in a coalbed methane high-efficiency pressure stabilizing drainage device Figure 2 ;

[0038] Figure 7 This is a schematic cross-sectional view of a filter-enhancing component in a high-efficiency, pressure-stabilizing coalbed methane production and extraction device;

[0039] Figure 8 This is a schematic diagram of the implementation of a filtration component in a high-efficiency, pressure-stabilizing coalbed methane production device;

[0040] In the figure: 1. Extraction cylinder; 2. Buffer cylinder; 3. Extraction tube; 4. Pressure stabilizing assembly; 5. Changing space; 11. Extraction hole; 21. Buffer plate; 22. Elastic member; 41. Outer cylinder; 42. Track; 43. Connecting seat; 44. Track seat; 45. Outer wheel body; 46. Inner wheel body; 47. Synchronizing rod; 48. Power assembly; 49. Dust removal assembly; 410. Filtering assembly; 491. Driver; 492. Disc; 493. Base plate; 4101. Winding drum; 4102. Filtering belt; 4103. Drain hole; 4104. Sprinkler head. DETAILED DESCRIPTION

[0041] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, and this is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0042] Example: Please refer to Figures 1-8 In an embodiment of the present invention, a high-efficiency, pressure-stabilized coalbed methane drainage device is provided, comprising:

[0043] A pumping tube 1, one end of which is closed and the other end is connected to a buffer tube 2;

[0044] A plurality of extraction holes 11 distributed on the side of the extraction tube 1, wherein the extraction holes 11 radially penetrate the extraction tube 1 and are close to the closed end of the extraction tube 1;

[0045] A filter screen is fixed in the extraction hole 11;

[0046] The pressure stabilizing component 4 is arranged outside the extraction tube 1 and corresponds to the extraction hole 11, and is used to increase the density of the filter screen during the drainage and pressure reduction stage, and to perform regular dust removal on the filter screen during the negative pressure suction stage.

[0047] During the drainage and pressure reduction stage, the pressure stabilizing component 4 implements a dense covering on the filter screen fixed to the extraction hole 11. At this time, the porosity of the filter screen surface is reduced, forming a dense filter layer, which can cope with the large amount of coalbed methane precipitation during the drainage and pressure reduction stage and maintain the pressure in the extraction tube stable. When entering the negative pressure suction stage, the pressure stabilizing component 4 switches the working mode and performs periodic dust removal operations on the filter screen through mechanical vibration and other means to remove coal powder impurities attached to the surface of the filter screen and restore the air permeability of the filter screen. Compared with traditional fixed filtering devices, the pressure fluctuation amplitude is reduced by more than 40%. In addition, the dust removal function and the densification and covering function are integrated into the same component, which has high integration.

[0048] It is worth mentioning that the outer tube 41 can be used as a stabilizing tube embedded in the wellbore. Specifically, the outer diameter of the outer tube 41 is large and close to the outer diameter of the wellbore. Therefore, it is only necessary to arrange some expandable and contractible bladders on the outer wall of the outer tube 41.

[0049] In this embodiment, the voltage stabilizing component 4 includes:

[0050] The outer tube 41 is coaxially sleeved on the outside of the extraction tube 1 with intervals, and one end of the outer tube 41 is sealed with the extraction tube 1 and the other end is an open end;

[0051] Two coaxially symmetrically arranged rails 42, the two rails 42 are connected to the inner wall of the outer cylinder 41 through a connecting seat 43;

[0052] Two movable pressure stabilizing devices, each of which is supported by two rails 42, and can move along the rails 42 and act on the filter screen;

[0053] A direction-changing space 5 is defined between the outer tube 41 and the extraction tube 1 .

[0054] The deflection space 5 serves as a gas redirection channel. When the dust-laden airflow enters the open end of the outer cylinder 41, its direction changes. Coal dust particles, due to inertia, strike the inner wall of the outer cylinder 41. Under the action of gravity, they move downward along the deflection space 5, achieving gas-solid separation. Clean gas then enters the extraction cylinder 1 through the extraction hole 11. Furthermore, as mentioned above, the outer cylinder 41 can be embedded in the wellbore as a centering cylinder. Therefore, the deflection space 5 simultaneously performs the triple functions of centering, coal dust settling, and device installation, integrating multiple technical effects within a limited radial space.

[0055] In this embodiment, the mobile voltage stabilizing device includes:

[0056] Two track seats 44 are respectively provided corresponding to the two tracks 42 , and an outer wheel body 45 and an inner wheel body 46 are rotatably provided on the track seats 44 , wherein the inner wheel body 46 is engaged with the tracks 42 , and the outer wheel body 45 is in sliding contact with the tracks 42 ;

[0057] The dust removal assembly 49 comprises:

[0058] The base plate 493 is supported by the two rail seats 44;

[0059] The driver 491 is disposed on the substrate 493 , and a disk 492 is disposed at its output end, and bristles are disposed on the surface of the disk 492 .

[0060] The synchronization rod 47 is connected between the corresponding two inner wheel bodies 46. Of course, the synchronization rod 47 can also be set between the corresponding two outer wheel bodies 45, and the synchronization rod 47 is driven by the power component 48. The power component 48 includes a gear set and a power device that drives the gear set, which will not be repeated here.

[0061] In an optional embodiment, the driver 491 in one of the mobile voltage stabilizing devices is a motor, and the driver 491 in the other mobile voltage stabilizing device is a self-vibrator.

[0062] When the device moves to the filter area, the dust removal assembly 49, supported by the base plate 493, enters its operating position. The motor-driven disc 492 rotates, causing the bristles to create a sweeping effect, removing coal dust from the filter surface. Meanwhile, the self-vibrator-driven disc 492 vibrates, causing the bristles to vibrate slightly, disrupting the coal dust's adsorption capacity. These two drive modes can operate independently or in conjunction, respectively, adapting to continuous dust removal and deep blockage clearing.

[0063] Furthermore, a filter-enhancing component 410 is provided on one side of the substrate 493 of each mobile pressure-stabilizing device. When the two mobile pressure-stabilizing devices move in the same direction, the filter is dusted by the dust removal component 49; when the two mobile pressure-stabilizing devices move in opposite directions, the filter is densely covered by the filter-enhancing component 410.

[0064] Specifically, the filtration component 410 includes:

[0065] The winding drum 4101 has a rotating drum rotatably disposed therein;

[0066] The filtration belt 4102 has one end wound around the rotating drum and the other end extending out of the winding drum 4101;

[0067] The ends of the filtration belts 4102 of the two filtration enhancement assemblies 410 are connected to each other.

[0068] The filtration assembly 410 dynamically adjusts the filtration density through the linkage between the take-up drum 4101 and the filtration belt 4102. When the two movable pressure-stabilizing devices move in opposite directions along the track 42 (one moving clockwise and the other moving counterclockwise), the interconnected filtration belt 4102 is pulled out of the take-up drum 4101, forming a covering structure on the filter surface.

[0069] Of course, even if the filter belt 4102 is used to cover the outer surface of the extraction tube 1, there are still some parts of the filter screen that are not covered, such as Figure 8 , the uncovered straight-line distance is M. In practical applications, the distance L between the two winding drums 4101 should be minimized as much as possible, and the position of the filtration belt 4102 extending from the winding drum 4101 should be adjusted, that is, the filtration belt 4102 extends from the position A of the winding drum 4101 close to the extraction drum 1, so that the number of uncovered filter screens can be effectively reduced.

[0070] Furthermore, the filtering precision parameters of the filtering belts 4102 of the two filtering components 410 are different. Therefore, in a specific implementation, filtering belts 4102 with different filtering precision parameters can be selected.

[0071] Specifically, the filter enhancement assembly 410 achieves on-demand coverage through a differentiated dual filtration precision parameter design. When the two mobile pressure stabilizing devices move in opposite directions to unfold the filter enhancement belt 4102, filter enhancement belts 4102 with different filtration precision parameters can be selected.

[0072] It needs to be explained that different filtration accuracy parameters mean different covering densities. Of course, when the filtration belt 4102 is covered on the filter net, the filtration belt 4102 can play a certain role in intercepting coal powder, so the filtration belt 4102 must be constantly cleaned.

[0073] In order to clean the filtration belt, a drainage hole 4103 is opened at the bottom of the winding drum 4101, and a water spray head 4104 is installed on the inner wall of the winding drum 4101.

[0074] During the winding and adjustment process, the water spray head 4104 sprays high-pressure water onto the surface of the filtration belt 4102, using hydraulic impact to peel off the embedded coal powder, and the sewage is discharged from the winding drum 4101 through the drainage hole 4103, realizing self-cleaning of the belt body.

[0075] In this embodiment, a buffer plate 21 is slidably provided in the buffer cylinder 2 , an elastic member 22 is connected between the buffer plate 21 and the buffer cylinder 2 , and a pumping tube 3 is further provided on one side of the buffer cylinder 2 .

[0076] When coalbed methane enters the buffer cylinder 2, the gas pressure pushes the buffer plate 21 axially along the cylinder, causing the elastic member 22 (such as a coil spring or gas spring) to deform and absorb the impact energy. After the pressure peak, the restoring force of the elastic member 22 pushes the buffer plate 21 back to its original position, converting the stored elastic potential energy into gas kinetic energy, thereby maintaining stable system pressure.

[0077] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high-efficiency, pressure-stabilizing coalbed methane drainage device, characterized in that: include: An extraction tube (1), wherein one end of the extraction tube (1) is a closed end and the other end is connected to a buffer tube (2); A plurality of extraction holes (11) distributed on the side of the extraction tube (1), wherein the extraction holes (11) radially penetrate the extraction tube (1), and the extraction holes (11) are close to the closed end of the extraction tube (1); A filter screen fixedly arranged in the extraction hole (11); A pressure stabilizing component (4) is arranged outside the extraction cylinder (1) and corresponds to the extraction hole (11), and is used to increase the density of the filter screen during the drainage and pressure reduction stage, and to perform regular dust removal on the filter screen during the negative pressure suction stage.

2. The high-efficiency and stable-pressure coalbed methane drainage device according to claim 1 is characterized in that: The voltage stabilizing component (4) comprises: An outer cylinder (41) is coaxially sleeved on the outside of the extraction cylinder (1) at intervals, and one end of the outer cylinder (41) is sealedly connected to the extraction cylinder (1), and the other end is an open end; Two coaxially symmetrically arranged rails (42), the two rails (42) being connected to the inner wall of the outer cylinder (41) via a connecting seat (43); Two movable pressure stabilizing devices, each of the movable pressure stabilizing devices being supported by two rails (42) and being capable of moving along the rails (42) and acting on the filter screen; A direction-changing space (5) is defined between the outer cylinder (41) and the extraction cylinder (1).

3. The high-efficiency and stable pressure drainage device for coalbed methane according to claim 2 is characterized in that: The mobile voltage stabilizing device comprises: Two track seats (44) are respectively provided corresponding to the two tracks (42), and an outer wheel body (45) and an inner wheel body (46) are rotatably provided on the track seats (44), wherein the inner wheel body (46) is engaged with the track (42), and the outer wheel body (45) is in sliding contact with the track (42); A dust removal assembly (49) comprising: A base plate (493) is supported by the two rail seats (44); The driver (491) is arranged on the substrate (493), and a disk (492) is provided at the output end thereof, and bristles are provided on the surface of the disk (492).

4. The high-efficiency and stable-pressure coalbed methane drainage device according to claim 3 is characterized in that: The driver (491) in one of the mobile voltage stabilizing devices is a motor, and the driver (491) in the other mobile voltage stabilizing device is a self-vibrator.

5. The high-efficiency and pressure-stabilizing coalbed methane drainage device according to claim 3 is characterized in that: A filter-increasing component (410) is further provided on one side of the base plate (493) of each movable pressure-stabilizing device. When the two movable pressure-stabilizing devices move in the same direction, the filter screen is dusted by the dust removal component (49); and when the two movable pressure-stabilizing devices move in opposite directions, the filter screen is densely covered by the filter-increasing component (410).

6. The high-efficiency and pressure-stabilizing coalbed methane drainage device according to claim 5 is characterized in that: The filtration enhancement component (410) comprises: A winding drum (4101) having a rotating drum rotatably disposed therein; A filtration belt (4102), one end of which is wound around the rotating drum and the other end of which extends out of the winding drum (4101); The ends of the filtration belts (4102) of the two filtration enhancement assemblies (410) are connected to each other.

7. The high-efficiency and pressure-stabilizing coalbed methane drainage device according to claim 6 is characterized in that: The filtering accuracy parameters of the filtering belts (4102) of the two filtering components (410) are different.

8. The high-efficiency and pressure-stabilizing coalbed methane drainage device according to claim 6 is characterized in that: A drainage hole (4103) is provided at the bottom of the winding drum (4101), and a water spray head (4104) is installed on the inner wall of the winding drum (4101).

9. The high-efficiency and pressure-stabilizing coalbed methane drainage device according to claim 1 is characterized in that: A buffer plate (21) is slidably provided in the buffer cylinder (2), and an elastic member (22) is connected between the buffer plate (21) and the buffer cylinder (2).

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