Hole sealing, fracturing and bulletproof integrated device

Abstract

The utility model discloses a hole sealing, fracturing and bulletproof integrated device. A front hole sealing section, a middle positioning fracturing section and a rear hole sealing section are arranged on a water injection pipe; the front capsule and the rear capsule are respectively sleeved outside the front hole sealing section and the rear hole sealing section, and are respectively communicated with the water injection pipe through the front capsule water injection port and the rear capsule water injection port; the positioning fracturing mechanism is arranged on the middle positioning fracturing section and comprises a fracturing bin, a limiting block, a rubber base and a positioning column. The middle positioning fracturing section is sleeved with the fracturing bin and the anti-seepage bin from inside to outside, and fracturing holes are formed in the fracturing bin; the limiting block is mounted on the inner side wall of the fracturing bin; radial guide holes A and B are oppositely formed in the anti-seepage bin and the limiting block; the rubber base is assembled in the anti-seepage bin in a sliding manner; the top guide section extends into the radial guide hole B through the radial guide hole A; the positioning column is arranged in the radial guide hole B and connected with the top guide section, and the positioning column is sleeved with the spring. The device can integrally realize hole sealing operation, positioning operation and fracturing operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mining, and in particular relates to an integrated device for sealing, fracturing and preventing ejection. Background Art

[0002] During underground mining operations in coal mines, in order to improve the permeability of coal seams and the efficiency of gas extraction, it is often necessary to carry out hydraulic fracturing operations on regional coal bodies to increase the permeability of coal seams, improve the gas extraction rate, release the gas pressure in coal seams, and change the properties of the coal body, thereby effectively reducing the danger of coal and gas outbursts and achieving the purpose of coal and gas co-mining.

[0003] A sealing method with good sealing performance, strong high-pressure resistance, and stable performance is a prerequisite for the smooth implementation of hydraulic fracturing operations. However, existing fracturing technologies have many problems, such as poor sealing effect and the sealing device being prone to popping out during the fracturing process. This will reduce the pressure that can be withstood during the sealing process, which will seriously affect the fracturing effect and even cause major safety accidents. At the same time, the existing fracturing and sealing devices have a single function and a complicated operation process. It is usually necessary to install the sealing device and fracturing equipment separately, resulting in low operating efficiency during the fracturing operation. For this reason, there is an urgent need to provide a device that can integrate the functions of sealing, positioning, and fracturing operations. Summary of the Invention

[0004] In response to the problems existing in the above-mentioned prior art, the utility model provides an integrated device for sealing, fracturing and anti-pop-up, which has a reasonable structure, diverse functions, low manufacturing and use costs, simple operation process and high operation efficiency. It can realize sealing, positioning and fracturing operations in an integrated manner, which can significantly improve the convenience and safety of operations.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an integrated device for sealing, fracturing and preventing pop-up, comprising a water injection pipe, a front capsule, a rear capsule, and a positioning fracturing mechanism;

[0006] The water injection pipe is provided with a front sealing section, a middle positioning fracturing section and a rear sealing section in order from front to back, and its front end is a closed structure, and its rear end serves as a water injection end;

[0007] The front capsule is fixedly sleeved on the outside of the front sealing section, and the inner cavity of the front capsule is connected to the inner cavity of the water injection pipe through a plurality of front capsule water injection ports radially opened on the front sealing section;

[0008] The rear capsule is fixedly sleeved on the outside of the rear sealing section, and the inner cavity of the rear capsule is connected to the inner cavity of the water injection pipe through a plurality of rear capsule water injection ports radially opened on the rear sealing section;

[0009] The positioning fracturing mechanism is arranged on the middle positioning fracturing section, and includes a fracturing chamber, a limit block, a rubber base, and a positioning column;

[0010] The fracturing chamber is cylindrical and coaxially fixedly sleeved on the outside of the middle positioning fracturing section, and forms an annular fracturing cavity between the water injection pipe and the fracturing chamber; a plurality of fracturing holes connected to the annular fracturing cavity are radially opened on the front and rear sections of the fracturing chamber;

[0011] The anti-seepage chamber is cylindrical and is located on the inner side of the middle section of the annular fracturing chamber. It is coaxially fixed and sleeved on the outside of the central positioning fracturing section. At the same time, an annular anti-seepage chamber is formed between the water injection pipe and the anti-seepage chamber. The central area of ​​the annular anti-seepage chamber in the longitudinal direction is connected to the inner cavity of the water injection pipe through multiple anti-seepage chamber water inlets uniformly arranged on the water injection pipe in an annular direction. Multiple radial guide holes A are opened on the barrel of the anti-seepage chamber corresponding to the multiple anti-seepage chamber water inlets. Two fracturing chamber water inlets are opened on the inner side of the front and rear end plates of the anti-seepage chamber at positions corresponding to the anti-seepage chamber water inlets.

[0012] The stop block is annular in structure and is arranged on the outer side of the middle section of the annular fracturing chamber corresponding to the anti-seepage chamber and is coaxially fixedly mounted on the inner side wall of the fracturing chamber. A plurality of radial guide holes B are formed on the annular portion of the stop block at positions corresponding to the plurality of radial guide holes A. The size of the radial guide holes B is consistent with the size of the radial guide holes A. The plurality of radial guide holes B are connected to the outside world through a plurality of radial guide holes C formed on the body of the fracturing chamber. The size of the radial guide holes C is smaller than the size of the radial guide holes B.

[0013] Multiple rubber bases are arranged in the annular anti-seepage cavity corresponding to multiple anti-seepage chamber water inlets, and the rubber base includes a bottom sliding section and a top guide section. The bottom sliding section is a block structure with an arc-shaped cross-section, and its length dimension is adapted to the length dimension of the annular anti-seepage cavity, and its width dimension is larger than the aperture of the anti-seepage chamber water inlet and the aperture of the corresponding two fracturing chamber water inlets, and is slidably and sealingly assembled on the inner side of the annular anti-seepage cavity. When the bottom sliding section slides to the inner end of the annular anti-seepage cavity, it simultaneously blocks the anti-seepage chamber water inlet and the corresponding two fracturing chamber water inlets. When the bottom sliding section slides to the outer end of the annular anti-seepage cavity, it simultaneously detaches from the anti-seepage chamber water inlet and the corresponding two fracturing chamber water inlets; the outer diameter of the top guide section is adapted to the size of the radial guide hole A, and it is slidably and sealingly inserted into the radial guide hole A, and its inner end is fixedly connected to the center of the outer arc surface of the bottom sliding section, and its outer end is slidably and sealingly inserted into the radial guide hole B;

[0014] Multiple sealing rubber pads are arranged in the annular anti-seepage cavity corresponding to the multiple rubber bases. The size of the sealing rubber pads is adapted to the size of the bottom sliding section. The inner side of the sealing rubber pad is fixedly connected to the outer surface of the water injection pipe, and the outer side thereof cooperates with the inner side of the bottom sliding section. The sealing rubber pad is provided with a connecting hole at a position corresponding to the water inlet of the anti-seepage chamber.

[0015] A plurality of positioning posts are arranged inside the plurality of radial guide holes B, the hole diameters of the positioning posts are adapted, the outer ends of the positioning posts are coaxially fixedly connected at the center, and the outer ends thereof are radially slidably inserted into the radial guide holes C;

[0016] The plurality of springs correspond to the plurality of positioning columns. The springs are sleeved on the outside of the corresponding positioning columns, and the inner ends of the springs abut against the outer ends of the top guide sections, and the outer ends of the springs abut against the inner sidewall of the fracturing chamber.

[0017] Furthermore, in order to improve the sealing effect, the bottom sliding section is fixedly connected with a cylindrical plug at a position corresponding to the communicating hole; when the bottom sliding section is snugly connected to the sealing gasket, the cylindrical plug is inserted into the communicating hole.

[0018] As a preferred embodiment, the positioning column and the radial guide hole B are radially limited.

[0019] Furthermore, in order to improve the positioning effect, the outer end of the positioning column is a sharp structure that gradually smoothes from front to back and protrudes outward.

[0020] As a preference, the pre-capsule and the post-capsule are of the same model.

[0021] Furthermore, in order to facilitate the connection to the high-pressure water supply equipment, the water injection end of the water injection pipe is connected to a quick-connect connector.

[0022] In the present invention, a front capsule and a rear capsule are respectively installed on the outside of the front sealing section and the rear sealing section of the water injection pipe, and the front capsule and the rear capsule are connected to the inner cavity of the water injection pipe through the front capsule water injection port and the rear capsule water injection port provided on the water injection pipe, so that water injection operation can be carried out in the front capsule and the rear capsule by using the water injection pipe, so that the capsules can fully expand and seal with the hole wall of the borehole, thereby achieving effective plugging operation of the borehole, thereby forming a closed space between the front capsule and the rear capsule. The fracturing chamber is coaxially installed on the outside of the middle positioning fracturing section, and an annular fracturing cavity is formed between the water injection pipe and the fracturing chamber, and a plurality of fracturing holes are opened on the barrel of the fracturing chamber. In this way, during the fracturing operation, high-pressure water can be ejected at high speed from the diameter of the fracturing chamber barrel closer to the borehole, thereby significantly improving the fracturing effect. The anti-seepage chamber located in the annular fracturing chamber is coaxially mounted on the outside of the middle positioning fracturing section, and an annular anti-seepage chamber is formed between the water injection pipe and the anti-seepage chamber. At the same time, the central area of ​​the annular anti-seepage chamber is connected to the inner cavity of the water injection pipe through multiple anti-seepage chamber water inlets circumferentially opened on the water injection pipe, and fracturing water inlets corresponding to the anti-seepage chamber water inlets are opened on the front and rear end plates of the anti-seepage chamber. In this way, the water in the water injection pipe can first enter the anti-seepage chamber through the anti-seepage chamber water inlet, and then enter the annular fracturing chamber outside the anti-seepage chamber through the fracturing water inlet. Therefore, it is convenient to set a seat in the anti-seepage chamber to open or close the anti-seepage chamber water inlet and the fracturing water inlet, so as to achieve effective control of the fracturing operation. An annular limit block is fixedly connected to the inner wall of the fracturing chamber, and the limit block is aligned with the anti-seepage chamber. A radial guide hole B and a radial guide hole A are correspondingly provided on the limit block and the anti-seepage chamber. The radial guide holes B and A can be used to form a radial sliding space for the top guide section in the rubber base. Thus, when the rubber base is placed in the anti-seepage chamber, the top guide section can be slid through the radial guide hole A and extended into the radial guide hole B, thereby ensuring that the rubber base in the anti-seepage chamber moves only in the radial direction. The bottom sliding section of the rubber base is slidably and sealedly assembled in the annular anti-seepage cavity, and the anti-seepage chamber water inlet and the corresponding two fracturing chamber water inlets can be opened or closed during the sliding process. A smaller radial guide hole C is opened on the barrel of the fracturing chamber corresponding to the radial guide hole B, and then a positioning column is slidably assembled in the radial guide hole C. At the same time, the inner end of the positioning column is coaxially fixedly connected to the center area of ​​the outer end of the top guide section. Then, a spring is set in the radial guide hole B and is sleeved on the outside of the positioning column. In this way, the elastic force of the spring can be used to press the rubber base against the side close to the water injection pipe, and the elastic force of the spring can be used as the opening pressure of the anti-seepage chamber.In addition, when the water injection pressure overcomes the elastic force of the spring and pushes the rubber base as a whole to the outer end of the annular anti-seepage cavity, the outer end of the positioning column will extend out of the fracturing chamber and then press against or penetrate the wall of the drilled hole, thereby achieving a reliable positioning effect. When the water injection pressure decreases, the elastic force of the spring will push the rubber base to the inner end of the annular anti-seepage cavity again, thereby driving the positioning column to quickly reach a retracted state, which is conducive to the withdrawal operation of the device. A sealing rubber gasket that is compatible with the bottom sliding section is snugly assembled at the inner end of the annular anti-seepage cavity, and a corresponding connecting hole is opened on it. The sealing performance at the water inlet of the anti-seepage chamber can be improved by cooperating with the bottom sliding section.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Through the integrated design, the sealing, fracturing and anti-pop-out functions are integrated into one, which significantly improves the convenience and safety of the operation;

[0025] 2. The device has a high degree of integration, and there is no need to install or disassemble components before and after operations. At the same time, it has a high degree of automation. Only the water injection pressure needs to be controlled to carry out sealing operations, positioning operations and fracturing operations in sequence, which can effectively simplify the operation process and fully improve the operation efficiency.

[0026] 3. The device has good stability and can effectively reduce the occurrence of repeated operations and increased maintenance costs caused by equipment failure, thereby reducing the overall operating costs;

[0027] 4. The device has strong versatility and adaptability, and is suitable for various underground coal mine operating conditions.

[0028] The device has a reasonable structure, diverse functions, low manufacturing and use costs, a simple operation process, and high operating efficiency. It can realize sealing operations, positioning operations, and fracturing operations in an integrated manner, significantly improving the convenience and safety of operations, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of the utility model;

[0030] Figure 2 This is a schematic diagram of the assembly of the water injection pipe, anti-seepage chamber, fracturing chamber, sealing gasket and limit block in the utility model;

[0031] Figure 3 It is a structural diagram of the positioning fracturing mechanism part of the utility model;

[0032] Figure 4 It is a structural diagram of the rubber base in the utility model.

[0033] In the figure: 1. water injection pipe, 2. front capsule water injection port, 3. front capsule, 4. rear capsule water injection port, 5. rear capsule, 6. quick connector, 7. fracturing chamber, 8. fracturing hole, 9. positioning column, 10. spring, 11. limit block, 12. rubber base, 13. sealing gasket, 14. anti-seepage chamber water inlet, 15. anti-seepage chamber, 16. fracturing chamber water inlet, 17. front sealing section, 18. middle positioning fracturing section, 19. rear sealing section, 20. positioning fracturing mechanism, 21. annular fracturing chamber, 22. annular anti-seepage chamber, 23. connecting hole, 24. radial guide hole A, 25. bottom sliding section, 26. top guide section, 27. radial guide hole B, 28. radial guide hole C, 29. cylindrical plug. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the following embodiments, but the present invention is not limited to the following embodiments.

[0035] like Figures 1 to 4 As shown, the utility model provides an integrated device for sealing, fracturing and preventing pop-up, including a water injection pipe 1, a front capsule 3, a rear capsule 5, and a positioning fracturing mechanism 20;

[0036] The water injection pipe 1 is provided with a front sealing section 17, a middle positioning fracturing section 18 and a rear sealing section 19 in order from front to back, and its front end is a closed structure, and its rear end serves as a water injection end;

[0037] The front capsule 3 is fixedly sleeved on the outside of the front sealing section 17, and the inner cavity of the front capsule 3 is connected to the inner cavity of the water injection pipe 1 through a plurality of front capsule water injection ports 2 radially opened on the front sealing section 17;

[0038] The rear capsule 5 is fixedly sleeved on the outside of the rear sealing section 19, and the inner cavity of the rear capsule 5 is connected to the inner cavity of the water injection pipe 1 through a plurality of rear capsule water injection ports 4 radially opened on the rear sealing section 19;

[0039] The positioning fracturing mechanism 20 is arranged on the middle positioning fracturing section 18, and includes a fracturing chamber 7, an anti-seepage chamber 15, a limit block 11, a rubber base 12, a positioning column 9 and a spring 10;

[0040] The fracturing chamber 7 is cylindrical and is coaxially fixedly mounted on the outside of the central positioning fracturing section 18, and forms an annular fracturing cavity 21 between the water injection pipe 1 and the fracturing chamber 7; a plurality of fracturing holes 8 connected to the annular fracturing cavity 21 are radially opened on the front and rear sections of the cylinder of the fracturing chamber 7, wherein the plurality of fracturing holes 8 are evenly distributed circumferentially along the cylinder of the fracturing chamber 7.

[0041] The anti-seepage chamber 15 is cylindrical and is located on the inner side of the middle section of the annular fracturing chamber 21. It is coaxially fixedly sleeved on the outside of the central positioning fracturing section 18. At the same time, an annular anti-seepage chamber 22 is formed between the water injection pipe 1 and the anti-seepage chamber 15. The central area of ​​the annular anti-seepage chamber 22 in the longitudinal direction is connected to the inner cavity of the water injection pipe 1 through multiple anti-seepage chamber water inlets 14 uniformly arranged on the water injection pipe 1 in an annular direction. Multiple radial guide holes A24 are opened on the barrel of the anti-seepage chamber 15 corresponding to the multiple anti-seepage chamber water inlets 14. Two fracturing chamber water inlets 16 are opened on the inner side of the front and rear end plates of the anti-seepage chamber 15 at positions corresponding to the anti-seepage chamber water inlets 14.

[0042] The stop block 11 is annular in structure and is arranged on the outer side of the middle section of the annular fracturing chamber 21 corresponding to the anti-seepage chamber 15, and is coaxially fixedly mounted on the inner side wall of the fracturing chamber 7. The stop block 11 is provided with a plurality of radial guide holes B27 on the annular surface at positions corresponding to the plurality of radial guide holes A24. The size of the radial guide holes B27 is consistent with the size of the radial guide holes A24. The plurality of radial guide holes B27 are connected to the outside world through a plurality of radial guide holes C28 provided on the body of the fracturing chamber 7. The size of the radial guide holes C28 is smaller than that of the radial guide holes B27.

[0043] A plurality of rubber bases 12 are arranged in the annular anti-seepage cavity 22 corresponding to a plurality of anti-seepage chamber water inlets 14. The rubber base 12 includes a bottom sliding section 25 and a top guide section 26. The bottom sliding section 25 is a block structure with an arc-shaped cross section. The size of the bottom sliding section 25 is adapted to the size of the annular anti-seepage cavity 22 in the length direction. The size of the bottom sliding section 25 in the width direction is larger than the aperture of the anti-seepage chamber water inlet 14 and the aperture of the corresponding two fracturing chamber water inlets 16. The bottom sliding section 25 is slidingly and sealingly assembled on the inner side of the annular anti-seepage cavity 22. When the bottom sliding section 25 slides to the annular anti-seepage cavity 2 2, it simultaneously blocks the anti-seepage compartment water inlet 14 and the corresponding two fracturing compartment water inlets 16. When the bottom sliding section 25 slides to the outer end of the annular anti-seepage cavity 22, it simultaneously detaches from the anti-seepage compartment water inlet 14 and the corresponding two fracturing compartment water inlets 16. The outer diameter of the top guide section 26 is adapted to the size of the radial guide hole A24, and it is slidably and sealingly inserted into the radial guide hole A24, and its inner end is fixedly connected to the center of the outer arc surface of the bottom sliding section 25, and its outer end is slidably and sealingly inserted into the radial guide hole B27.

[0044] Multiple sealing rubber pads 13 are arranged in the annular anti-seepage cavity 22 corresponding to the multiple rubber bases 12. The size of the sealing rubber pads 13 is adapted to the size of the bottom sliding section 25. The inner side of the sealing rubber pad 13 is fixedly connected to the outer surface of the water injection pipe 1, and its outer side is matched with the inner side of the bottom sliding section 25. The sealing rubber pad 13 is provided with a connecting hole 23 at the position corresponding to the water inlet 14 of the anti-seepage bin;

[0045] Multiple positioning posts 9 are disposed within the multiple radial guide holes B27 corresponding to the multiple rubber bases 12. The outer diameter of the positioning posts 9 matches the diameter of the radial guide holes C28. The inner ends of the positioning posts 9 are coaxially fixedly connected to the centers of the outer ends of the corresponding top guide sections 26, and their outer ends are radially slidably inserted into the radial guide holes C28. When the multiple positioning posts 9 are fully retracted, the circular surface formed by the outer ends of the multiple positioning posts 9 is smaller than the diameter of the positioning holes.

[0046] Multiple springs 10 are arranged in multiple radial guide holes B27 corresponding to multiple positioning columns 9. The springs 10 are sleeved on the outside of the corresponding positioning columns 9, and their inner ends abut against the outer ends of the top guide sections 26, and their outer ends abut against the inner wall of the fracturing chamber 7.

[0047] In order to improve the sealing effect, the bottom sliding section 25 is fixedly connected with a cylindrical plug 29 at a position corresponding to the communicating hole 23 ; when the bottom sliding section 25 is snugly connected to the sealing gasket 13 , the cylindrical plug 29 is inserted into the communicating hole 23 .

[0048] As a preferred embodiment, the positioning column 9 is radially limited in fit with the radial guide hole B27.

[0049] In order to improve the positioning effect, the outer end of the positioning column 9 is a sharp structure that gradually smoothes from front to back and protrudes outward.

[0050] As a preference, the pre-capsule 3 and the post-capsule 5 are of the same model.

[0051] Furthermore, in order to facilitate the connection to the high-pressure water supply equipment, the water injection end of the water injection pipe 1 is connected to a quick-connect connector 6.

[0052] During use, the entire device is placed into the directional drilled hole, and ensure that the front capsule 3 and the rear capsule 5 reach the front and rear sides of the fracturing section respectively. At the same time, the water injection end 6 at the rear end of the water injection pipe 1 is located near the orifice, and the water injection end 6 is connected to the external high-pressure water supply equipment through the quick-plug connector 6. The high-pressure water supply equipment pumps high-pressure water into the water injection pipe 1. Under the strong elastic force of the spring 10, the rubber base 12 is pressed against the surface of the sealing gasket 13, so that the water inlet 14 of the anti-seepage chamber can be effectively sealed. In this way, high-pressure water will first enter the interior of the front capsule 3 through the front capsule water injection port 2, and enter the interior of the rear capsule 5 through the rear capsule water injection port 4, until the front capsule 3 and the rear capsule 5 are fully expanded and sealed in contact with the wall of the positioning borehole, thereby forming a closed space between the front capsule 3 and the rear capsule 5, thereby achieving effective sealing of the front and rear sides of the fracturing section. When the front capsule 3 and the rear capsule 5 are fully expanded, the high-pressure water will no longer be able to enter the interior of the front capsule 3 and the rear capsule 5. The continuously pumped high-pressure water causes the water pressure in the water injection pipe 1 to continue to increase. When the water pressure exceeds the elastic force of the spring 10 acting on the rubber base 12, the rubber base 12 will be pushed toward the limit block 11 until it reaches the outer end of the annular anti-seepage cavity 22, thereby opening the anti-seepage chamber water inlet 14 and the corresponding two fracturing chamber water inlets 16. Synchronously, the positioning column 9 reaches a fully extended state radially outward and penetrates into the hole wall, so as to prevent the device from popping out of the borehole during the fracturing process by positioning. During this process, the high-pressure water in the water injection pipe 1 can enter the annular fracturing cavity 21 through the anti-seepage chamber water inlet 14 and the corresponding two fracturing chamber water inlets 16. Since the high-pressure water in the water injection pipe 1 acts on multiple rubber bases 12 in the radial direction at the same time, the high-pressure water will quickly enter the annular fracturing cavity 21 outside the anti-seepage chamber 15 through multiple anti-seepage chamber water inlets 14 and several fracturing chamber water inlets 16, thereby causing the annular fracturing cavity 21 outside the anti-seepage chamber 15 to quickly reach a high-pressure state. At the same time, the high-pressure water is radially ejected at high speed through multiple fracturing holes 8 and acts on the hole wall to start the fracturing operation. After the crushing is completed, the high-pressure water supply equipment is controlled to stop working, and the water injection end 6 is separated from the external high-pressure water supply equipment. The front capsule 3 and the rear capsule 5 squeeze out the water inside under the action of their own elasticity and discharge it through the water injection pipe 1. At the same time, after the water pressure drops, the spring 10 elastically acts on the rubber base 12 to reset the rubber base 12 to the inner end of the annular anti-seepage cavity 22, and the anti-seepage chamber water inlet 14 and the corresponding two fracturing chamber water inlets 16 are blocked again. Synchronously, the positioning column 9 is driven to retract into the interior of the fracturing chamber 7, releasing the positioning state of the device, and then the device can be taken out of the positioning drilled hole.

[0053] In the present invention, a front capsule and a rear capsule are respectively installed on the outside of the front sealing section and the rear sealing section of the water injection pipe, and the front capsule and the rear capsule are connected to the inner cavity of the water injection pipe through the front capsule water injection port and the rear capsule water injection port provided on the water injection pipe, so that water injection operation can be carried out in the front capsule and the rear capsule by using the water injection pipe, so that the capsules can fully expand and seal with the hole wall of the borehole, thereby achieving effective plugging operation of the borehole, thereby forming a closed space between the front capsule and the rear capsule. The fracturing chamber is coaxially installed on the outside of the middle positioning fracturing section, and an annular fracturing cavity is formed between the water injection pipe and the fracturing chamber, and a plurality of fracturing holes are opened on the barrel of the fracturing chamber. In this way, during the fracturing operation, high-pressure water can be ejected at high speed from the diameter of the fracturing chamber barrel closer to the borehole, thereby significantly improving the fracturing effect. The anti-seepage chamber located in the annular fracturing chamber is coaxially mounted on the outside of the middle positioning fracturing section, and an annular anti-seepage chamber is formed between the water injection pipe and the anti-seepage chamber. At the same time, the central area of ​​the annular anti-seepage chamber is connected to the inner cavity of the water injection pipe through multiple anti-seepage chamber water inlets circumferentially opened on the water injection pipe, and fracturing water inlets corresponding to the anti-seepage chamber water inlets are opened on the front and rear end plates of the anti-seepage chamber. In this way, the water in the water injection pipe can first enter the anti-seepage chamber through the anti-seepage chamber water inlet, and then enter the annular fracturing chamber outside the anti-seepage chamber through the fracturing water inlet. Therefore, it is convenient to set a seat in the anti-seepage chamber to open or close the anti-seepage chamber water inlet and the fracturing water inlet, so as to achieve effective control of the fracturing operation. An annular limit block is fixedly connected to the inner wall of the fracturing chamber, and the limit block is aligned with the anti-seepage chamber. A radial guide hole B and a radial guide hole A are correspondingly provided on the limit block and the anti-seepage chamber. The radial guide holes B and A can be used to form a radial sliding space for the top guide section in the rubber base. Thus, when the rubber base is placed in the anti-seepage chamber, the top guide section can be slid through the radial guide hole A and extended into the radial guide hole B, thereby ensuring that the rubber base in the anti-seepage chamber moves only in the radial direction. The bottom sliding section of the rubber base is slidably and sealedly assembled in the annular anti-seepage cavity, and the anti-seepage chamber water inlet and the corresponding two fracturing chamber water inlets can be opened or closed during the sliding process. A smaller radial guide hole C is opened on the barrel of the fracturing chamber corresponding to the radial guide hole B, and then a positioning column is slidably assembled in the radial guide hole C. At the same time, the inner end of the positioning column is coaxially fixedly connected to the center area of ​​the outer end of the top guide section. Then, a spring is set in the radial guide hole B and is sleeved on the outside of the positioning column. In this way, the elastic force of the spring can be used to press the rubber base against the side close to the water injection pipe, and the elastic force of the spring can be used as the opening pressure of the anti-seepage chamber.In addition, when the water injection pressure overcomes the elastic force of the spring and pushes the rubber base as a whole to the outer end of the annular anti-seepage cavity, the outer end of the positioning column will extend out of the fracturing chamber and then press against or penetrate the wall of the drilled hole, thereby achieving a reliable positioning effect. When the water injection pressure decreases, the elastic force of the spring will push the rubber base to the inner end of the annular anti-seepage cavity again, thereby driving the positioning column to quickly reach a retracted state, which is conducive to the withdrawal operation of the device. A sealing rubber gasket that is compatible with the bottom sliding section is snugly assembled at the inner end of the annular anti-seepage cavity, and a corresponding connecting hole is opened on it. The sealing performance at the water inlet of the anti-seepage chamber can be improved by cooperating with the bottom sliding section.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1. Through the integrated design, the sealing, fracturing and anti-pop-out functions are integrated into one, which significantly improves the convenience and safety of the operation;

[0056] 2. The device has a high degree of integration, and there is no need to install or disassemble components before and after operations. At the same time, it has a high degree of automation. Only the water injection pressure needs to be controlled to carry out sealing operations, positioning operations and fracturing operations in sequence, which can effectively simplify the operation process and fully improve the operation efficiency.

[0057] 3. The device has good stability and can effectively reduce the occurrence of repeated operations and increased maintenance costs caused by equipment failure, thereby reducing the overall operating costs;

[0058] 4. The device has strong versatility and adaptability, and is suitable for various underground coal mine operating conditions.

[0059] The device has a reasonable structure, diverse functions, low manufacturing and use costs, a simple operation process, and high operating efficiency. It can realize sealing operations, positioning operations, and fracturing operations in an integrated manner, significantly improving the convenience and safety of operations, and is suitable for large-scale promotion and use.

Claims

1. A sealing, fracturing and anti-pop-up integrated device, comprising a water injection pipe (1), a front capsule (3) and a rear capsule (5), characterized in that: Also included is a positioning fracturing mechanism (20); The water injection pipe (1) is provided with a front sealing section (17), a middle positioning fracturing section (18) and a rear sealing section (19) in order from front to back, and its front end is a closed structure, and its rear end serves as a water injection end; The front capsule (3) is fixedly sleeved on the outside of the front sealing section (17), and the inner cavity of the front capsule (3) is connected to the inner cavity of the water injection pipe (1) through a plurality of front capsule water injection ports (2) radially opened on the front sealing section (17); The rear capsule (5) is fixedly sleeved on the outside of the rear sealing section (19), and the inner cavity of the rear capsule (5) is connected to the inner cavity of the water injection pipe (1) through a plurality of rear capsule water injection ports (4) radially opened on the rear sealing section (19); The positioning fracturing mechanism (20) is arranged on the middle positioning fracturing section (18), and comprises a fracturing chamber (7), an anti-seepage chamber (15), a limit block (11), a rubber base (12), a positioning column (9) and a spring (10); The fracturing chamber (7) is cylindrical and is coaxially fixedly sleeved on the outside of the middle positioning fracturing section (18), and forms an annular fracturing cavity (21) between the water injection pipe (1) and the fracturing chamber (7); a plurality of fracturing holes (8) communicating with the annular fracturing cavity (21) are radially opened on the front and rear sections of the fracturing chamber (7); The anti-seepage chamber (15) is cylindrical and is located on the inner side of the middle section of the annular fracturing chamber (21), and is coaxially fixedly sleeved on the outside of the middle positioning fracturing section (18). At the same time, an annular anti-seepage chamber (22) is formed between the water injection pipe (1) and the anti-seepage chamber (15); the central area of ​​the annular anti-seepage chamber (22) in the longitudinal direction is connected to the inner cavity of the water injection pipe (1) through a plurality of anti-seepage chamber water inlets (14) uniformly arranged on the water injection pipe (1) in an annular direction; a plurality of radial guide holes A (24) are provided on the barrel of the anti-seepage chamber (15) corresponding to the plurality of anti-seepage chamber water inlets (14), and two fracturing chamber water inlets (16) are provided on the inner side of the front and rear end plates of the anti-seepage chamber (15) at positions corresponding to the anti-seepage chamber water inlets (14); The limit block (11) is an annular structure, which is arranged on the outer side of the middle section of the annular fracturing chamber (21) corresponding to the anti-seepage chamber (15), and is coaxially fixedly installed on the inner wall of the fracturing chamber (7); a plurality of radial guide holes B (27) are opened in the annular direction of the limit block (11) at positions corresponding to the plurality of radial guide holes A (24), and the size of the radial guide holes B (27) is consistent with the size of the radial guide holes A (24); the plurality of radial guide holes B (27) are connected to the outside through a plurality of radial guide holes C (28) opened on the barrel of the fracturing chamber (7), and the size of the radial guide holes C (28) is smaller than the size of the radial guide holes B (27); A plurality of rubber bases (12) are arranged in an annular anti-seepage cavity (22) corresponding to a plurality of anti-seepage chamber water inlets (14). The rubber base (12) comprises a bottom sliding section (25) and a top guide section (26). The bottom sliding section (25) is a block structure with an arc-shaped cross section. The length direction of the bottom sliding section (25) is adapted to the length direction of the annular anti-seepage cavity (22). The width direction of the bottom sliding section (25) is larger than the aperture of the anti-seepage chamber water inlet (14) and the aperture of the corresponding two fracturing chamber water inlets (16). The bottom sliding section (25) is slidingly and sealingly assembled on the inner side of the annular anti-seepage cavity (22). When the bottom sliding section (25) slides into the annular anti-seepage cavity ( 22), it simultaneously blocks the anti-seepage chamber water inlet (14) and the corresponding two fracturing chamber water inlets (16); when the bottom sliding section (25) slides to the outer end of the annular anti-seepage cavity (22), it simultaneously detaches from the anti-seepage chamber water inlet (14) and the corresponding two fracturing chamber water inlets (16); the outer diameter of the top guide section (26) is adapted to the size of the radial guide hole A (24), and it is inserted into the radial guide hole A (24) in a sliding and sealing manner, and its inner end is fixedly connected to the center of the outer arc surface of the bottom sliding section (25), and its outer end is inserted into the radial guide hole B (27) in a sliding and sealing manner; A plurality of sealing rubber pads (13) are arranged in the annular anti-seepage cavity (22) corresponding to the plurality of rubber bases (12); the size of the sealing rubber pads (13) is adapted to the size of the bottom sliding section (25); the inner side of the sealing rubber pad (13) is fixedly connected to the outer surface of the water injection pipe (1), and the outer side thereof is matched with the inner side of the bottom sliding section (25); the sealing rubber pad (13) is provided with a communication hole (23) at a position corresponding to the water inlet (14) of the anti-seepage chamber; A plurality of positioning columns (9) are arranged inside a plurality of radial guide holes B (27) corresponding to a plurality of rubber bases (12); the outer diameter of the positioning column (9) is adapted to the diameter of the radial guide hole C (28); the inner end of the positioning column (9) is coaxially fixedly connected to the center of the outer end of the corresponding top guide section (26); and the outer end thereof is radially slidably inserted into the radial guide hole C (28); A plurality of springs (10) are arranged in a plurality of radial guide holes B (27) corresponding to a plurality of positioning columns (9). The springs (10) are fitted onto the outside of the corresponding positioning columns (9), and their inner ends abut against the outer ends of the top guide sections (26), and their outer ends abut against the inner sidewall of the fracturing chamber (7).

2. The integrated sealing, fracturing and anti-pop-up device according to claim 1, characterized in that: The bottom sliding section (25) is fixedly connected with a cylindrical plug (29) at a position corresponding to the communicating hole (23); when the bottom sliding section (25) is snugly connected to the sealing rubber gasket (13), the cylindrical plug (29) is inserted into the communicating hole (23).

3. The integrated sealing, fracturing and anti-pop-up device according to claim 1 or 2, characterized in that: The positioning column (9) is radially limited in fit with the radial guide hole B (27).

4. The integrated sealing, fracturing and anti-pop-up device according to claim 3, characterized in that: The outer end of the positioning column (9) is a sharp structure that gradually smoothes outward from front to back.

5. The integrated sealing, fracturing and anti-pop-up device according to claim 4, characterized in that: The pre-capsule (3) and post-capsule (5) are of the same model.

6. The integrated sealing, fracturing and anti-pop-up device according to claim 5, characterized in that: The water injection end of the water injection pipe (1) is connected to a quick-connect connector (6).

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