A jet device for hydraulic fracturing of a coal mine roof

Abstract

This utility model provides a jetting device for hydraulic fracturing of coal mine roof, including a jetting device body, a nozzle connected to the inside of the jetting device body, a fixing ring integrally formed with the outside of the jetting device body, and a protective plate arranged in a circumferential array covering the outside of the jetting device body. The protective plate has water-permeable holes corresponding to the nozzles. One end of the jetting device body is inserted into one side of the fixing ring, and the other side of the jetting device body is detachably fixed to the outside of the jetting device body by a fastener. In this utility model, several protective plates surround the outside of the jetting device body in a cylindrical shape. During the jetting process, the protective plates block the backflow of water to achieve the purpose of erosion resistance of the jetting device body. When a single protective plate is damaged, it is not necessary to disassemble the component connected to one end of the jetting device body. The corresponding fastener can be directly removed from the jetting device body, and the damaged protective plate can be replaced individually, which is convenient for maintenance.

Description

Technical Field

[0001] This utility model belongs to the technical field of fracturing equipment, specifically relating to a jetting device for hydraulic fracturing of coal mine roof. Background Technology

[0002] In recent years, the rock pressure caused by hard roofs in coal mining has severely impacted production efficiency and safety levels. Faced with the difficulty of roof collapse, the industry has successively tried technologies such as blasting pre-splitting and carbon dioxide fracturing, but these generally suffer from limitations such as high randomness in fracture formation and high disturbance intensity, making on-site operation difficult and costly. Hydraulic fracturing technology, by modifying the rock mass structure with high-pressure water flow, has become an important means to improve tunneling efficiency.

[0003] During hydraulic perforation fracturing, the high-speed perforating fluid injected into the inner wall of the casing will splash back, forming a splash zone around the nozzle of the injector, especially in the axial direction. This zone is splashed and eroded for a long time, which may cause the injector to fail.

[0004] In the prior art, Chinese utility model patent document CN214499011U discloses a high-efficiency perforation fracturing jetting device with an anti-erosion protective sleeve, and another Chinese utility model patent document CN221973493U discloses a sliding-sleeve alloy hydraulic jetting gun for downhole hydraulic jet fracturing. Currently, the purpose of erosion resistance is achieved by fitting a protective sleeve (anti-erosion protective sleeve) on the outside of the nozzle of the jetting device body. This method of erosion resistance has two drawbacks: firstly, after damage, the components connected to one end need to be disassembled and replaced, which is a relatively cumbersome replacement process; secondly, if one side of the protective sleeve is damaged, the entire device needs to be replaced, resulting in high material costs.

[0005] Therefore, it is necessary to design a jetting device for hydraulic fracturing of coal mine roof that can be directly disassembled, facilitates replacement and maintenance, and reduces the cost of replacement materials to solve the current technical problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a jetting device for hydraulic fracturing of coal mine roof that can be directly disassembled, facilitates replacement and maintenance, and reduces the cost of replacement materials.

[0007] The technical solution of this utility model is as follows: a jetting device for hydraulic fracturing of coal mine roof, comprising a jetting device body, a nozzle connected to the inside of the jetting device body, a fixing ring integrally formed therewith fixedly disposed on the outside of the jetting device body, a protective plate covering the outside of the jetting device body in a circumferential array, the protective plate being provided with water-permeable holes corresponding to the nozzles, one end of the jetting device body being inserted into one side of the fixing ring, and the other side of the jetting device body being detachably fixed to the outside of the jetting device body by means of a fastener.

[0008] Furthermore, the guard plate has a guard plate body, and both ends of the guard plate body are fixedly provided with connecting end plates that are integral with it. The connecting end plates are symmetrically provided with connecting holes. The fixing member has a fixing plate, and the inner side of the fixing plate is provided with a positioning groove that matches the connecting end plate. The interior of the positioning groove is provided with a mounting hole that penetrates the fixing plate, corresponding to the connecting hole. The mounting hole and the connecting hole are provided with bolts for detachable and fixed connection with the spray device body.

[0009] Furthermore, a slot matching the connecting end plate is provided on one side of the fixing ring, and the connecting end plate is inserted into the slot.

[0010] Furthermore, both the main body of the protective plate and the connecting end plate are arc-shaped plates whose inner sides match the outer side of the main body of the spraying device.

[0011] Furthermore, a padding layer is provided on the inner side of the main body of the protective plate, and a wear-resistant coating is provided on the outer side of the main body of the protective plate.

[0012] Furthermore, the pad is a polytetrafluoroethylene pad or a polyurethane plastic pad, and the wear-resistant coating is a metal-based or ceramic-based wear-resistant coating.

[0013] Furthermore, the nozzle is threadedly fitted inside the side wall of the main body of the spraying device.

[0014] Furthermore, the outer side of the main body of the spraying device is covered with eight protective plates in a circumferential array.

[0015] The beneficial effects of this utility model are:

[0016] (1) In this utility model, several protective plates are arranged in a cylindrical shape on the outside of the main body of the spraying device. During the spraying process, the protective plates block the backflow of water to achieve the purpose of erosion resistance of the main body of the spraying device.

[0017] (2) When a single guard plate is damaged, there is no need to disassemble the parts connected to one end of the spray device body. The corresponding fastener can be directly removed from the spray device body, and the damaged guard plate can be replaced separately, which is convenient for maintenance.

[0018] (3) Since the guard plate can be replaced individually, the cost of replacement materials can be reduced. Attached Figure Description

[0019] Figure 1 This is one of the structural schematic diagrams of the jetting device for hydraulic fracturing of the coal mine roof in this utility model.

[0020] Figure 2This is the second schematic diagram of the jetting device for hydraulic fracturing of the coal mine roof in this utility model.

[0021] Figure 3 for Figure 2 Cross-sectional view at point AA.

[0022] Figure 4 This is a schematic diagram of the structure of the protective plate in this utility model.

[0023] Figure 5 This is a structural schematic diagram of the fixing component in this utility model. Detailed Implementation

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are not intended to limit the present invention or its application or use in any way. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0025] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] like Figures 1 to 5As shown, a jetting device for hydraulic fracturing of coal mine roof is disclosed, including a jetting device body 1, a nozzle 5 connected to the body of the jetting device body 1, a fixing ring 4 integrally formed with the body of the jetting device body 1, and a protective plate 2 arranged in a circumferential array covering the outer side of the jetting device body 1. The protective plate 2 is provided with water-permeable holes 23 corresponding to the nozzle 5. One end of the jetting device body 1 is inserted into one side of the fixing ring 4, and the other side of the jetting device body 1 is detachably fixed to the outer side of the jetting device body 1 by a fastener 3. In this embodiment, several protective plates 2 surround the outer side of the jetting device body 1 in a cylindrical shape. During the jetting process, the protective plates 2 block the backflow of water to achieve the purpose of erosion resistance of the jetting device body 1. When a single protective plate 2 is damaged, it is not necessary to disassemble the component connected to one end of the jetting device body 1. The corresponding fastener can be directly removed from the jetting device body 1, and the damaged protective plate 2 can be replaced individually, which is convenient for maintenance. Since the protective plates 2 can be replaced individually, the replacement material cost can be reduced.

[0027] In some embodiments, the guard plate 2 has a guard plate body 21, and both ends of the guard plate body 21 are fixedly provided with connecting end plates 22 that are integral with it. The connecting end plates 22 are symmetrically provided with connecting holes 24. The fastener 3 has a fixing plate 31, which is an arc-shaped plate whose inner side matches the outer side of the spray device body 1. The inner side of the fixing plate 31 is provided with a positioning groove 32 that matches the connecting end plate 22. The interior of the positioning groove 32 is provided with a mounting hole 33 that passes through the fixing plate, corresponding to the connecting hole 24. The mounting hole 33 and the connecting hole 24 are provided with bolts for detachable fixed connection with the spray device body. The connecting end plate 22 at one end of the guard plate 2 is inserted into the interior of one side of the fixing ring 4. The connecting end plate 22 at the other end of the guard plate 2 is matched and fitted into the positioning groove 32. The fixing plate 31 is fixed to the outer side of the spray device body 1 by bolt assembly. The fixing plates 31 abut against each other to ensure their stability. The guard plate 2 can be disassembled and replaced by removing the bolts inside the mounting hole 33.

[0028] In some embodiments, a slot 41 matching the connecting end plate 22 is provided on one side of the fixing ring 4, and the connecting end plate 22 is inserted into the slot 41; after the fixing member 3 at one end of the guard plate 2 is removed, the other end of the guard plate 2 can be pulled out from the slot 41 for replacement.

[0029] In some embodiments, the guard plate body 21 and the connecting end plate 22 are both arc-shaped plates whose inner sides match the outer sides of the spray device body 1.

[0030] In some embodiments, a pad is provided on the inner side of the protective plate body 21, and a wear-resistant coating is provided on the outer side of the protective plate body 21. The pad is used to eliminate the installation gap between the protective plate body 21 and the spray device body 1, ensuring the stability of the installation of the protective plate 2. The wear-resistant coating is used to improve the wear resistance of the outer side of the protective plate body 21, so that the protective plate 2 has a longer service life. Specifically, the pad is a polytetrafluoroethylene pad or a polyurethane plastic pad, and the wear-resistant coating is a metal-based or ceramic-based wear-resistant coating. More specifically, the metal-based wear-resistant coating is a tungsten carbide coating or a chromium carbide coating, and the ceramic-based wear-resistant coating is a silicon carbide coating, a chromium oxide ceramic coating, or a silicon nitride coating. In addition, the inner side of the protective plate body 21 is the side closer to the spray device body 1, and the other side is the outer side.

[0031] In some embodiments, the nozzle 5 is threaded inside the side wall of the spray device body 1. When the nozzle 5 malfunctions such as wear, the outer protective plate 2 can be removed to disassemble and replace the nozzle 5.

[0032] In some embodiments, the outer side of the main body 1 of the spraying device is covered with eight protective plates 2 in a circular array; wherein the protective plates 2 are 45° arc-shaped plates.

[0033] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0034] The embodiments described above only illustrate some implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A jetting device for hydraulic fracturing of coal mine roof, characterized in that: The device includes a main body for spraying, on which a nozzle is provided and communicates with its interior. A fixing ring integrally formed with the main body is fixedly provided on the outer side of the main body. A protective plate is covered in a circumferential array on the outer side of the main body. Water-permeable holes corresponding to the nozzle are provided on the protective plate. One end of the main body is inserted into one side of the fixing ring, and the other end of the main body is detachably fixed to the outer side of the main body by a fastener.

2. The jetting device for hydraulic fracturing of coal mine roof according to claim 1, characterized in that: The guard plate has a main body, and both ends of the main body are fixedly provided with connecting end plates that are integral with it. The connecting end plates are symmetrically provided with connecting holes. The fixing member has a fixing plate, and the inner side of the fixing plate is provided with a positioning groove that matches the connecting end plate. The interior of the positioning groove is provided with a mounting hole that penetrates the fixing plate, corresponding to the connecting hole. The mounting hole and the connecting hole are provided with bolts for detachable and fixed connection with the main body of the spraying device.

3. The jetting device for hydraulic fracturing of coal mine roof according to claim 2, characterized in that: The fixing ring has a slot on one side that matches the connecting end plate, and the connecting end plate is inserted into the slot.

4. The jetting device for hydraulic fracturing of coal mine roof according to claim 2, characterized in that: Both the main body of the protective plate and the connecting end plate are arc-shaped plates whose inner sides match the outer side of the main body of the spraying device.

5. The jetting device for hydraulic fracturing of coal mine roof according to claim 2, characterized in that: The inner side of the protective plate body is provided with a padding layer, and the outer side of the protective plate body is provided with a wear-resistant coating.

6. The jetting device for hydraulic fracturing of coal mine roof according to claim 5, characterized in that: The padding layer is a polytetrafluoroethylene padding layer or a polyurethane plastic padding layer, and the wear-resistant coating is a metal-based or ceramic-based wear-resistant coating.

7. The jetting device for hydraulic fracturing of coal mine roof according to claim 1, characterized in that: The nozzle is threadedly fitted inside the side wall of the main body of the spraying device.

8. The jetting device for hydraulic fracturing of coal mine roof according to claim 1, characterized in that: The outer side of the main body of the spraying device is covered with eight protective plates arranged in a circular array.

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