Hydraulic fracturing device for coal mine tunnel

Abstract

The utility model provides a coal mine tunnel hydraulic fracturing device and relates to the technical field of hydraulic fracturing, the coal mine tunnel hydraulic fracturing device comprises a water injection pipe used for being inserted into a coal seam drill hole, one end of the water injection pipe is connected with a high-pressure water conveying assembly, and the end, close to the high-pressure water conveying assembly, of the water injection pipe is fixedly sleeved with a sleeve; the sleeve with the hole sealing bag and the anti-scour fixing assembly is fixedly arranged on the water injection pipe in the sleeved mode, the hole sealing bag is used for sealing a gap between the coal seam drill hole and the water injection pipe, fracturing fluid is prevented from leaking, the anti-scour fixing assembly is used for fixing the sleeve in the coal seam drill hole, and the anti-scour fixing assembly is used for fixing the sleeve in the coal seam drill hole. The sleeve is firmly fixed in a coal seam drill hole through the anti-scour fixing assembly, high-pressure recoil force is effectively resisted, the water injection pipe is prevented from popping out, the situation that high-pressure liquid is suddenly sprayed out due to equipment damage and popping out of the water injection pipe is avoided, casualties and roof collapse risks caused by high-pressure liquid spraying out are reduced, and the hydraulic fracturing operation safety of a coal mine tunnel is improved.

Description

Technical Field

[0001] This application relates to the field of hydraulic fracturing technology, and more specifically, to a hydraulic fracturing device for coal mine roadways. Background Technology

[0002] A hydraulic fracturing device for coal mine roadways is a piece of equipment used in coal mining. It mainly uses a high-pressure pump to inject prepared fracturing fluid into the coal seam borehole at high speed through a water injection pipe. The powerful pressure of the high-pressure fluid opens up the coal seam rock and forms cracks. At the same time, proppant is added with a sand mixing truck when necessary to maintain the open state of the cracks, thereby improving the permeability of the coal seam, assisting in gas extraction and roadway depressurization, and ensuring safe and efficient coal mining.

[0003] However, existing hydraulic fracturing devices for coal mine roadways are prone to ejecting the injection pipe from the fracturing hole due to high-pressure backlash during use. This not only causes the pipe to bend or break, directly damaging the equipment, but also the sudden ejection of high-pressure liquid may cause casualties or lead to the risk of collapse in unstable areas of the roof.

[0004] However, existing hydraulic fracturing devices in coal mine roadways suffer from significant problems related to high-pressure backlash. When high-pressure liquid is injected into the fracturing hole, the powerful backlash often causes the injection pipe to pop out, leading to bending or breakage and preventing the equipment from functioning properly. Furthermore, the sudden ejection of high-pressure liquid can easily cause injuries or fatalities to on-site workers and impact unstable areas of the roof, potentially triggering a collapse. Summary of the Invention

[0005] The purpose of this application is to provide a hydraulic fracturing device for coal mine roadways, which can solve the technical problems of existing hydraulic fracturing devices in coal mine roadways, where high pressure back force causes the water injection pipe to pop out, resulting in equipment damage and inability to work normally, and high pressure liquid spraying can easily cause casualties, impact unstable areas of the roof, and cause the risk of collapse.

[0006] This application provides a hydraulic fracturing device for coal mine roadways, including a water injection pipe for insertion into a coal seam borehole. One end of the water injection pipe is connected to a high-pressure water delivery component. A sleeve is fixedly fitted at the end of the water injection pipe near the high-pressure water delivery component. A sealing bag is provided at the end of the sleeve away from the high-pressure water delivery component. An anti-impact fixing component is provided on the sleeve to fix the sleeve inside the coal seam borehole.

[0007] Furthermore, the anti-impact fixing assembly includes a first movable cylinder, a second movable cylinder, and multiple support rods and connecting rods. The outer wall of the first sleeve is provided with an external thread, and the inner wall of the first movable cylinder is provided with an internal thread adapted to the external thread. The first movable cylinder is threadedly connected to the sleeve through the cooperation of the internal thread and the external thread. The second movable cylinder is movably sleeved on the sleeve and located on the side of the first movable cylinder away from the high-pressure water delivery assembly. The first movable cylinder and the second movable cylinder are movably connected. Multiple support rods are evenly arranged around the periphery of the sleeve. One end of each support rod is hinged to the sleeve. Each connecting rod corresponds to one of the support rods. One end of each connecting rod is hinged to the second movable cylinder, and the other end of each connecting rod is hinged to the middle of the support rod.

[0008] Furthermore, an annular protrusion is provided on the outer wall of the first movable cylinder near the second movable cylinder, and an annular limiting groove is formed on the second movable cylinder near the first movable cylinder by bending. The annular protrusion is movably disposed in the annular limiting groove.

[0009] Furthermore, the high-pressure water delivery assembly includes a high-pressure pipeline, a high-pressure pump, and a water delivery pipe. One end of the high-pressure pipeline is connected to the water injection pipe, and the other end of the high-pressure pipeline is connected to the outlet of the high-pressure pump. One end of the water delivery pipe is connected to the inlet of the high-pressure pump, and the other end of the water delivery pipe is used to connect to an external water source.

[0010] Furthermore, a pressure gauge and a flow meter are installed on the high-pressure pipeline.

[0011] Furthermore, a shut-off valve is provided on the water supply pipe, and a backflow valve is provided on the high-pressure pipeline.

[0012] Furthermore, the water injection pipe is evenly provided with multiple water outlet holes.

[0013] The beneficial effects of this utility model are:

[0014] This utility model fixes a sleeve onto the water injection pipe. The sleeve is equipped with a sealing bag and an anti-impact fixing component. The sealing bag is used to seal the gap between the coal seam borehole and the water injection pipe to prevent fracturing fluid leakage. The anti-impact fixing component firmly fixes the sleeve inside the coal seam borehole, effectively resisting high-pressure backlash and preventing the water injection pipe from being ejected from the fracturing hole due to high-pressure backlash. This avoids bending and breakage of the water injection pipe, ensuring normal equipment operation, and preventing the sudden ejection of high-pressure liquid due to the ejection of the water injection pipe. This reduces the threat of injury or death to on-site workers and the risk of roof collapse caused by high-pressure liquid impact, thereby improving the safety of hydraulic fracturing operations in coal mine roadways. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 These are schematic diagrams of structures in some embodiments of this application;

[0017] Figure 2 This is a schematic diagram of the anti-collision fixing component and water injection pipe in some embodiments of this application;

[0018] Figure 3 This is an exploded view of the structure of the first and second movable cylinders in some embodiments of this application;

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Water inlet pipe; 11. Water outlet; 2. High-pressure water delivery assembly; 21. High-pressure pipeline; 22. High-pressure pump; 23. Water delivery pipe; 3. Sleeve; 4. Sealing bag; 6. Anti-impact fixing assembly; 61. First movable cylinder; 611. Annular protrusion; 62. Second movable cylinder; 621. Annular limiting groove; 63. Support rod; 64. Connecting rod; 7. Pressure gauge; 8. Flow meter; 9. Shut-off valve; 10. Backflow valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific Implementation

[0027] like Figure 1 and Figure 2As shown, this application provides a hydraulic fracturing device for coal mine roadways, including a water injection pipe 1 for insertion into a coal seam borehole. One end of the water injection pipe 1 is connected to a high-pressure water delivery component 2. A sleeve 3 is fixedly fitted onto the end of the water injection pipe 1 near the high-pressure water delivery component 2. A sealing bag 4 is provided at the end of the sleeve 3 away from the high-pressure water delivery component 2. An anti-impact fixing component 6 is provided on the sleeve 3 to fix the sleeve 3 inside the coal seam borehole. During operation, the water injection pipe 1 is first inserted into the coal seam borehole, and the sealing bag 4 is used to seal the gap between the coal seam borehole and the water injection pipe 1 to prevent fracturing fluid leakage. Then, the anti-impact fixing component 6 is used to fix the sleeve 3 inside the coal seam borehole. The fixing component 6 firmly secures the sleeve 3 inside the coal seam borehole. Subsequently, the high-pressure water delivery component 2 injects high-pressure water through the water injection pipe 1. The high-pressure water expands the coal seam rock, forming cracks. The anti-impact fixing component 6 effectively resists the high-pressure backlash force, preventing the water injection pipe 1 from being ejected from the fracturing hole due to high-pressure backlash. This avoids bending and breakage of the water injection pipe 1, ensuring normal operation of the equipment. It also prevents the sudden ejection of high-pressure liquid due to the ejection of the water injection pipe 1, reducing the threat of injury or death to on-site workers and the risk of roof collapse caused by high-pressure liquid impact, thus improving the safety of hydraulic fracturing operations in coal mine roadways.

[0028] like Figure 2 As shown, the anti-impact fixing assembly 6 includes a first movable cylinder 61, a second movable cylinder 62, multiple support rods 63, and connecting rods 64. The outer wall of the first sleeve 3 is provided with external threads, and the inner wall of the first movable cylinder 61 is provided with internal threads adapted to the external threads. The first movable cylinder 61 is threadedly connected to the sleeve 3 through the cooperation of the internal and external threads. The second movable cylinder 62 is movably sleeved on the sleeve 3 and located on the side of the first movable cylinder 61 away from the high-pressure water conveying assembly 2. The first movable cylinder 61 and the second movable cylinder 62 are movably connected. Multiple support rods 63 are evenly arranged around the periphery of the sleeve 3. One end of the support rod 63 is hinged to the sleeve 3. The connecting rods 64 correspond one-to-one with the support rods 63. One end of the connecting rod 64 is hinged to the second movable cylinder 62, and the other end of the connecting rod 64 is hinged to the middle of the support rod 63. In this embodiment, three support rods 63 are provided, and three corresponding connecting rods 64 are also provided. By utilizing the external thread on the outer wall of the sleeve 3 and the internal thread on the inner wall of the first movable cylinder 61, the first movable cylinder 61 can be screwed into a suitable position on the sleeve 3. When the first movable cylinder 61 moves, it can drive the second movable cylinder 62 to move accordingly. When the positions of the first movable cylinder 61 and the second movable cylinder 62 change, the connecting rod 64 will drive the support rod 63, causing the support rod 63 to rotate around the hinge point between the support rod 63 and the sleeve 3, thereby adjusting the extension angle of the support rod 63. When the support rod 63 is pressed against the coal seam borehole, the sleeve 3 can be firmly fixed in the coal seam borehole. The extension design of the support rod 63 allows the anti-impact fixing component 6 to adapt to the size of different coal seam boreholes, achieving stable support and effectively resisting high-pressure backlash.

[0029] like Figure 2 and Figure 3 As shown, the outer wall of the first movable cylinder 61 near the second movable cylinder 62 is provided with an annular protrusion 611. The end of the second movable cylinder 62 near the first movable cylinder 61 is bent to form an annular limiting groove 621 that matches the annular protrusion 611. The annular protrusion 611 is movably disposed in the annular limiting groove 621. The first movable cylinder 61 and the second movable cylinder 62 can achieve relative displacement and rotation by means of the movement of the annular protrusion 611 in the annular limiting groove 621. That is, when the first movable cylinder 61 is screwed to the appropriate position on the sleeve 3, it can simultaneously drive the second movable cylinder 62 to move radially along the sleeve 3, thereby driving the connecting rod 64 connected to the second movable cylinder 62 to move accordingly, so that the support rod 63 rotates around the hinge point between the support rod 63 and the sleeve 3.

[0030] like Figure 1 As shown, the high-pressure water delivery assembly 2 includes a high-pressure pipeline 21, a high-pressure pump 22, and a water delivery pipe 23. One end of the high-pressure pipeline 21 is connected to the water injection pipe 1, and the other end of the high-pressure pipeline 21 is connected to the outlet of the high-pressure pump 22. One end of the water delivery pipe 23 is connected to the inlet of the high-pressure pump 22, and the other end of the water delivery pipe 23 is used to connect to an external water source. After the high-pressure pump 22 starts, it uses its own power to draw water from the water source through the water delivery pipe 23. Subsequently, the high-pressure pump 22 applies strong pressure to the water it draws in, causing its pressure to increase significantly. The pressurized water flows out from the outlet of the high-pressure pump 22, is delivered to the water injection pipe 1 through the high-pressure pipeline 21, and is finally injected into the coal seam borehole to provide the required high-pressure water flow for hydraulic fracturing operations in coal mine roadways, thereby realizing the fracturing operation of the coal seam.

[0031] like Figure 1 As shown, the high-pressure pipeline 21 is equipped with a pressure gauge 7 and a flow meter 8. The pressure gauge 7 and flow meter 8 provide crucial real-time monitoring data for hydraulic fracturing operations in coal mine roadways. Through the pressure gauge 7, operators can accurately grasp the liquid pressure inside the high-pressure pipeline 21 and adjust the parameters of the high-pressure pump 22 in a timely manner to ensure that the fracturing fluid is injected into the coal seam at a suitable pressure. This avoids damage to equipment or safety accidents caused by excessive pressure, while insufficient pressure will prevent the desired fracturing effect from being achieved. The flow rate data provided by the flow meter 8 helps staff understand the injection rate of the fracturing fluid, ensuring that the liquid flow rate is stable and meets process requirements during fracturing, thereby optimizing the fracturing effect and improving operational efficiency. It also helps to detect abnormalities such as pipeline blockage in a timely manner, ensuring the safe, stable, and efficient operation of the entire hydraulic fracturing operation.

[0032] like Figure 1As shown, a shut-off valve 9 is installed on the water supply pipe 23, and a backflow valve 10 is installed on the high-pressure pipeline 21. The shut-off valve 9 allows operators to flexibly control the water flow in the water supply pipe 23. It can precisely cut off or connect the water source when the equipment is started, stopped, or under maintenance, improving the controllability and safety of equipment operation. The backflow valve 10 provides reliable backflow protection for the high-pressure pipeline 21, effectively preventing high-pressure liquid backflow caused by abnormal conditions, avoiding damage to equipment such as the high-pressure pump 22, ensuring the normal operation and service life of the equipment, ensuring that hydraulic fracturing operations in coal mine roadways can be carried out continuously, stably, and safely, and reducing operation interruptions and safety risks caused by equipment failure.

[0033] Multiple water outlet holes 11 are evenly arranged on the water injection pipe 1. The arrangement of water outlet holes 11 effectively optimizes the fracturing effect, allowing high-pressure liquid to be sprayed from different positions, so that the coal seam can be subjected to pressure in a wider area at the same time, forming a denser and more uniform fracture network, improving the permeability of the coal seam, and facilitating gas extraction and roadway depressurization.

[0034] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hydraulic fracturing device for coal mine roadways, characterized in that: The device includes a water injection pipe for insertion into a coal seam borehole. One end of the water injection pipe is connected to a high-pressure water delivery assembly. A sleeve is fixedly fitted at the end of the water injection pipe near the high-pressure water delivery assembly. A sealing bag is provided at the end of the sleeve away from the high-pressure water delivery assembly. An anti-impact fixing assembly is provided on the sleeve. The anti-impact fixing assembly is used to fix the sleeve inside the coal seam borehole. The anti-impact fixing assembly includes a first movable cylinder, a second movable cylinder, and multiple support rods and connecting rods. The outer wall of the first movable cylinder is provided with an external thread, and the inner wall of the first movable cylinder is provided with an internal thread adapted to the external thread. The first movable cylinder is threadedly connected to the sleeve through the cooperation of the internal thread and the external thread. The second movable cylinder is movably sleeved on the sleeve and located on the side of the first movable cylinder away from the high-pressure water delivery assembly. The first movable cylinder and the second movable cylinder are movably connected. Multiple support rods are evenly arranged around the periphery of the sleeve. One end of each support rod is hinged to the sleeve. Each connecting rod corresponds to one of the support rods. One end of each connecting rod is hinged to the second movable cylinder, and the other end of each connecting rod is hinged to the middle of the support rod.

2. The hydraulic fracturing device for coal mine roadways according to claim 1, characterized in that: The first movable cylinder has an annular protrusion on the outer wall of one end near the second movable cylinder. The second movable cylinder is bent at one end near the first movable cylinder to form an annular limiting groove that matches the annular protrusion. The annular protrusion is movably disposed within the annular limiting groove.

3. The hydraulic fracturing device for coal mine roadways according to claim 1, characterized in that: The high-pressure water delivery assembly includes a high-pressure pipeline, a high-pressure pump, and a water delivery pipe. One end of the high-pressure pipeline is connected to the water injection pipe, and the other end of the high-pressure pipeline is connected to the outlet of the high-pressure pump. One end of the water delivery pipe is connected to the inlet of the high-pressure pump, and the other end of the water delivery pipe is used to connect to an external water source.

4. The hydraulic fracturing device for coal mine roadways according to claim 3, characterized in that: The high-pressure pipeline is equipped with a pressure gauge and a flow meter.

5. A hydraulic fracturing device for coal mine roadways according to claim 3, characterized in that: The water supply pipe is equipped with a shut-off valve, and the high-pressure pipeline is equipped with a backflow valve.

6. The hydraulic fracturing device for coal mine roadways according to claim 1, characterized in that: The water injection pipe is evenly provided with multiple water outlet holes.

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