Coal bed gas fracturing and pulverized coal prevention integrated device

Abstract

The utility model relates to the technical field of coal bed gas fracturing exploitation, and provides a coal bed gas fracturing pulverized coal prevention integrated device. The coal bed gas fracturing and pulverized coal prevention integrated device comprises a connecting pipe, a Venturi tube type microbubble generator, a filtering mechanism, a backwashing mechanism and an outlet control valve. According to the coal bed gas fracturing pulverized coal prevention integrated device, pulverized coal sedimentation and blockage are prevented from the source, compared with a post interception or treatment scheme, the pulverized coal prevention efficiency is higher, the effect is more thorough, the core component Venturi tube type microbubble generator is of a pure mechanical structure, a complex circuit and a high-frequency vibration component are omitted, and the coal bed gas fracturing pulverized coal prevention integrated device is suitable for large-scale popularization and application. The defects that energy consumption is high and faults are prone to happening are overcome, meanwhile, the filter element is combined with the backwashing mechanism, the mechanical blocking risk and the requirement for frequent maintenance are greatly reduced, and the whole device has higher reliability and longer service life in the underground severe environment.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane fracturing mining technology, and in particular to an integrated device for preventing coal dust during coalbed methane fracturing. Background Technology

[0002] Coalbed methane, as an important unconventional natural gas resource, is primarily extracted using hydraulic fracturing technology. However, during fracturing, the coal seam inevitably produces a large amount of coal dust. This coal dust flows with the fracturing fluid and easily deposits at the bottom of the wellbore, clogging the fracturing fractures, abrading downhole and surface equipment, severely restricting extraction efficiency and posing safety hazards.

[0003] In the prior art, the invention patent with publication number CN120026888A proposes a high-efficiency coalbed methane fracturing and coal dust prevention device, which proposes a method of generating microbubbles with ultrasound and combining it with a complex mechanical cleaning mechanism. However, this solution has obvious drawbacks: the ultrasonic generator has high energy consumption and insufficient stability in the harsh underground environment, and it relies on precision mechanical components such as electric telescopic rods, cleaning rings, and tracks for cleaning, resulting in a complex structure that is prone to jamming and wear under high pressure and high dust conditions, leading to low reliability and difficult maintenance.

[0004] Therefore, it is necessary to provide a new integrated device for preventing coal dust during coalbed methane fracturing to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an integrated device for preventing coal dust during coalbed methane fracturing.

[0006] The coalbed methane fracturing anti-coal powder integrated device provided by this utility model includes: a connecting pipe, a Venturi tube microbubble generator, a filtration mechanism, a backwashing mechanism, and an outlet control valve. A matching cover plate is fixedly connected to the upper end of the connecting pipe, and an installation pipe is fixedly connected to the upper surface of the cover plate. The Venturi tube microbubble generator is installed at the upper end of the installation pipe. The filtration mechanism is connected inside the connecting pipe, and the filtration mechanism includes a partition plate, an internally threaded pipe, and a filter element. A matching partition plate is fixedly connected inside the connecting pipe, and an internally threaded pipe is fixedly connected to the lower surface of the partition plate. A matching filter element is internally threaded to the lower end of the internally threaded pipe. A backwashing mechanism is connected to the side of the connecting pipe, and the backwashing mechanism includes a backwashing pipe and a backwashing control valve. A backwashing pipe is fixedly connected to the side of the connecting pipe, and a backwashing control valve is installed on the backwashing pipe. An outlet control valve is installed on the connecting pipe, located above the lower end of the backwashing pipe.

[0007] Preferably, a threaded connector is fixedly connected to the side of the connecting pipe, and a pressure sensor is threadedly connected to the threaded connector.

[0008] Preferably, the threaded joint is located above the partition.

[0009] Preferably, the lower end of the backflushing pipe is located above the partition.

[0010] Preferably, the lower end of the connecting pipe is fixedly connected to a matching mounting flange.

[0011] Preferably, the upper end of the backwash pipe is fixedly connected to a connecting flange.

[0012] Preferably, the upper end of the mounting pipe is fixedly connected to a fixed flange, and the outlet of the venturi tube microbubble generator is fixedly connected to the fixed flange by bolts.

[0013] Compared with related technologies, the integrated coalbed methane fracturing and coal dust prevention device provided by this utility model has the following beneficial effects:

[0014] 1. This utility model provides an integrated device for preventing coal dust during coalbed methane fracturing. It utilizes a Venturi tube microbubble generator to energize the coal seam before fracturing fluid is injected, generating a large number of microbubbles. These microbubbles directly act on the newly generated coal dust downhole, actively carrying it to the top of the wellbore through flotation. This achieves the prevention of coal dust settling and blockage at the source. Compared with post-interception or treatment methods, this method has higher dust prevention efficiency and more fundamental effect.

[0015] 2. This utility model provides an integrated device for preventing coal dust during coalbed methane fracturing. The core component, the Venturi tube microbubble generator, is a purely mechanical structure without complex circuits or high-frequency vibrating components, thus avoiding the defects of high energy consumption and easy failure. At the same time, the filter element combined with the backwashing mechanism greatly reduces the risk of mechanical blockage and the need for frequent maintenance. The whole device has higher reliability and longer service life in the harsh underground environment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0018] Figure 3 This is a partial cross-sectional structural diagram of the present invention.

[0019] The following are the labels in the diagram: 1. Connecting pipe; 2. Mounting flange; 3. Mounting pipe; 4. Fixed flange; 5. Venturi tube microbubble generator; 6. Outlet control valve; 7. Backwash pipe; 8. Backwash control valve; 9. Pressure sensor; 10. Connecting flange; 11. Threaded joint; 12. Filter element; 13. Partition plate; 14. Internally threaded pipe; 15. Cover plate. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please refer to the following: Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram of the present invention from another angle; Figure 3 This is a partial cross-sectional structural diagram of the present invention. It includes: a connecting pipe 1, a Venturi tube microbubble generator 5, a filtration mechanism, a backwashing mechanism, and an outlet control valve 6.

[0022] refer to Figure 1 , Figure 2 and Figure 3 As shown, a matching cover plate 15 is fixedly connected to the upper end of the connecting pipe 1. An installation pipe 3 is fixedly connected to the upper surface of the cover plate 15. A Venturi tube microbubble generator 5 is installed at the upper end of the installation pipe 3. A filter mechanism is connected inside the connecting pipe 1. The filter mechanism includes a partition plate 13, an internally threaded pipe 14, and a filter element 12. A matching partition plate 13 is fixedly connected inside the connecting pipe 1. An internally threaded pipe 14 is fixedly connected to the lower surface of the partition plate 13. A matching filter element 12 is internally threaded to the lower end of the internally threaded pipe 14. A backwashing mechanism is connected to the side of the connecting pipe 1. The backwashing mechanism includes a backwashing pipe 7 and a backwashing control valve 8. A backwashing pipe 7 is fixedly connected to the side of the connecting pipe 1. The lower end of the backwashing pipe 7 is located above the partition plate 13. A backwashing control valve 8 is installed on the backwashing pipe 7. An outlet control valve 6 is installed on the connecting pipe 1. The outlet control valve 6 is located above the lower end of the backwashing pipe 7.

[0023] It should be noted that during use, the pumped fracturing fluid first flows through the Venturi tube microbubble generator 5, which uses the negative pressure to draw in and break up gas (the Venturi tube microbubble generator 5 is an existing device, and will not be described in detail here; its air inlet is connected to an existing gas supply device or gas filtration device), thereby preparing fracturing fluid carrying a large number of microbubbles. The fracturing fluid rich in microbubbles then passes through the internally threaded pipe 14 on the lower surface of the baffle 13, from the inside of the filter element 12 to the outside, and is injected into the underground coal seam through the lower end of the connecting pipe 1. When the fracturing fluid impacts the coal seam, the microbubbles it carries quickly adhere to the surface of the detached coal powder particles, forming coal powder and microbubble agglomerates. The density of these agglomerates decreases, and under the action of buoyancy, they move upward against the direction of the main fluid flow, thereby lifting the coal powder to the top area of ​​the wellbore or fracture, fundamentally avoiding the coal powder settling at the bottom of the well and blocking the flow passage. During this process, the filter element 12 effectively blocks the floating agglomerates, preventing them from entering the equipment.

[0024] It should be further explained that when the filter element 12 needs to be cleaned due to blockage by impurities, the outlet control valve 6 is closed and the backwash control valve 8 is opened. The pumped backwash fluid is directly introduced from the backwash pipe 7 to form a high-pressure fluid, which then flows from the inside of the filter element 12 to the outside. The high-pressure backwash fluid flushes down the impurities blocking the outside of the filter element 12, thus achieving automatic cleaning.

[0025] refer to Figure 1 and Figure 2 As shown, a threaded connector 11 is fixedly connected to the side of the connecting pipe 1. The threaded connector 11 is located above the partition plate 13. A pressure sensor 9 is threadedly connected to the threaded connector 11. The pressure sensor 9 can detect the pressure inside the connecting pipe 1. When the permeability of the filter element 12 decreases, the resistance of the fluid passing through the filter element 12 increases, and the pressure changes accordingly. By observing the change in the value of the pressure sensor 9, it is easy to understand the clogging status of the filter element 12 and to clean it in a timely manner.

[0026] refer to Figure 1 As shown, the lower end of the connecting pipe 1 is fixedly connected to a matching mounting flange 2, which facilitates the assembly and disassembly of the connecting pipe 1.

[0027] refer to Figure 1 As shown, the upper end of the backwash pipe 7 is fixedly connected to a connecting flange 10, which facilitates the connection of the backwash pipe 7 to an external pipeline.

[0028] refer to Figure 1 As shown, a fixed flange 4 is fixedly connected to the upper end of the mounting pipe 3. The outlet of the Venturi tube microbubble generator 5 is fixedly connected to the fixed flange 4 by bolts. The fixed flange 4 facilitates the assembly and disassembly of the Venturi tube microbubble generator 5.

[0029] The working principle of this utility model is as follows: During use, the pumped fracturing fluid first flows through the Venturi tube microbubble generator 5, which uses the negative pressure to draw in and break up gas (the Venturi tube microbubble generator 5 is an existing device, and will not be described in detail here; its air inlet is connected to an existing gas supply device or gas filtration device), thereby preparing a fracturing fluid carrying a large number of microbubbles. The microbubble-rich fracturing fluid then passes through the internally threaded tube 14 on the lower surface of the partition 13, flowing from the inside of the filter element 12 outwards, and is connected to... The lower end of pipe 1 is injected into the underground coal seam. When the fracturing fluid impacts the coal seam, the microbubbles it carries quickly adhere to the surface of the detached coal powder particles, forming coal powder and microbubble agglomerates. These agglomerates have a lower density and, under buoyancy, move upwards against the main fluid flow direction, thus lifting the coal powder to the top of the wellbore or fracture. This fundamentally prevents coal powder from settling at the bottom of the well and clogging the flow path. During this process, filter element 12 effectively blocks the floating agglomerates, preventing them from entering the equipment. When filter element 12 needs cleaning due to blockage caused by intercepted impurities... During the process, the outlet control valve 6 is closed and the backwash control valve 8 is opened. The pumped backwash fluid is directly introduced through the backwash pipe 7, forming a high-pressure fluid, which then flows from the inside of the filter element 12 to the outside. The high-pressure backwash fluid flushes away the impurities that are blocked on the outside of the filter element 12, achieving automatic cleaning. In summary, this utility model utilizes the Venturi tube microbubble generator 5 to energize the fracturing fluid before it is injected into the coal seam, generating a large number of microbubbles. The microbubbles directly act on the newly generated coal dust underground, actively carrying it to the top area of ​​the wellbore through the flotation principle. This achieves the prevention of coal dust settling and blockage from the source. Compared with the solution of interception or treatment after the fact, the dust prevention efficiency is higher and the effect is more fundamental. Moreover, the core component, the Venturi tube microbubble generator 5, is a purely mechanical structure without complex circuits and high-frequency vibration components, avoiding the defects of high energy consumption and easy failure. At the same time, the filter element 12 combined with the backwash mechanism greatly reduces the risk of mechanical blockage and the need for frequent maintenance. The overall device has higher reliability and longer service life in the harsh underground environment.

[0030] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0031] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An integrated device for preventing coal dust during coalbed methane fracturing, characterized in that, include: A connecting pipe (1) is fixedly connected to the upper end of the connecting pipe (1) with a matching cover plate (15), and an installation pipe (3) is fixedly connected to the upper surface of the cover plate (15). Venturi tube type microbubble generator (5), the upper end of the mounting tube (3) is equipped with Venturi tube type microbubble generator (5); The filter mechanism is connected inside the connecting pipe (1). The filter mechanism includes a partition (13), an internally threaded pipe (14), and a filter element (12). A matching partition (13) is fixedly connected inside the connecting pipe (1). The lower surface of the partition (13) is fixedly connected to the internally threaded pipe (14). The lower end of the internally threaded pipe (14) is internally threaded to a matching filter element (12). The backwashing mechanism is connected to the side of the connecting pipe (1). The backwashing mechanism includes a backwashing pipe (7) and a backwashing control valve (8). The side of the connecting pipe (1) is fixedly connected to the backwashing pipe (7), and the backwashing control valve (8) is installed on the backwashing pipe (7). An outlet control valve (6) is installed on the connecting pipe (1) and is located above the lower end of the backwash pipe (7).

2. The integrated coalbed methane fracturing and coal dust prevention device according to claim 1, characterized in that, The side of the connecting pipe (1) is fixedly connected to a threaded joint (11), and a pressure sensor (9) is threadedly connected to the threaded joint (11).

3. The integrated coalbed methane fracturing and coal dust prevention device according to claim 2, characterized in that, The threaded joint (11) is located above the partition (13).

4. The integrated coalbed methane fracturing and coal dust prevention device according to claim 1, characterized in that, The lower end of the backwash pipe (7) is located above the partition (13).

5. The integrated coalbed methane fracturing and coal dust prevention device according to claim 1, characterized in that, The lower end of the connecting pipe (1) is fixedly connected to a matching mounting flange (2).

6. The integrated coalbed methane fracturing and coal dust prevention device according to claim 1, characterized in that, The upper end of the backwash pipe (7) is fixedly connected to a connecting flange (10).

7. The integrated coalbed methane fracturing and coal dust prevention device according to claim 1, characterized in that, The upper end of the mounting pipe (3) is fixedly connected to a fixed flange (4), and the outlet of the Venturi tube microbubble generator (5) is fixedly connected to the fixed flange (4) by bolts.

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