An ex situ capping device

Abstract

The utility model relates to the technical field of hole sealing of coal mine gas extraction, concretely relates to an external injection type hole sealing device. The hole sealing device includes a connecting pipe, both ends of the connecting pipe are communicated with mounting seats, the mounting seat includes first pipe body and second pipe body connected in sequence along the longitudinal direction, a first grouting hole is arranged on the second pipe body, a cylindrical bag sleeve is arranged on the second pipe body, a grouting port is arranged on the connecting pipe or the mounting seat, a plugging plug is detachably connected in the grouting port, a second grouting hole is arranged on the connecting pipe or the mounting seat outside the covering range of the bag sleeve and close to the end of the connecting pipe, and a valve core is connected to the second grouting hole. The grout storage chamber formed by the mounting seat, the connecting pipe and the flow guide pipe can store more expansion agents, can be filled in the hole sealing section, and the hole sealing effect is improved. The grouting pipe is not needed to be separately arranged to grout the hole sealing section, the operation is simple, and the hole sealing efficiency is high. The overall structure is more compact, and the radial dimension occupied by the gas extraction hole is smaller.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for coal mine gas extraction, specifically to an external injection sealing device. Background Technology

[0002] Drilling for gas extraction is the main method of coal mine gas control, and sealing the borehole is one of the key steps in drilling for gas extraction. The two-plug-one-injection type sealing device is a commonly used sealing device for boreholes.

[0003] Chinese patent discloses a sealing device and sealing apparatus (publication number: CN219622667U). The bag-type sealing device consists of a reaction cylinder and two independent reagent cylinders. The two reagent cylinders respectively contain component A and component B of a polyurethane sealing agent. The reagent cylinders are connected to the reaction cylinder via simple valves, allowing for pre-filling of the reagents. On-site, simply opening the valves allows the two reagents to mix within the reaction cylinder. After the component A and component B react, the sealing agent foams and expands. The two-plug-one-injection sealing device includes two sealing devices connected in series on a gas extraction guide pipe. During sealing, two plugs are formed using the two bag-type sealing devices, and then the sealing agent is injected externally through an injection pipe, forming a sealed section between the two plugs.

[0004] While existing sealing devices can improve sealing efficiency, they also have some problems: First, the amount of agent stored in the agent cartridge is limited, only enough to inflate the two bags and form two seals; the sealing section between the two bags needs to be grouted separately through an injection pipe. Second, during use, a simple valve is opened to allow the A and B components stored in the two agent cartridges to react, making it difficult for the A and B components to mix evenly. This results in poor expansion of the polyurethane sealing agent, reducing the sealing effect. Utility Model Content

[0005] To address the aforementioned shortcomings, the technical problem to be solved by this utility model is to provide an external injection sealing device that can store more reagents, and the sealing section does not need to be injected through a separate grouting pipe, thereby improving the sealing efficiency.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An external injection sealing device is provided, comprising a connecting pipe, both ends of which are connected to tubular mounting seats. The mounting seats include a first pipe body and a second pipe body connected longitudinally, the inner diameter of the second pipe body being larger than the inner diameter of the first pipe body, and the first pipe body being located at the end of the mounting seat away from the connecting pipe. The second pipe body is provided with a first injection hole, and a cylindrical bladder sleeve is fitted onto the second pipe body, both ends of which are sealed to the second pipe body. The first injection hole is located within the coverage area of ​​the bladder sleeve. The connecting pipe or the second pipe body is provided with a grouting port, which is located outside the coverage area of ​​the bladder sleeve, and a sealing plug is detachably connected inside the grouting port. The mounting seat is located at the end of the connecting pipe outside the coverage area of ​​the bladder sleeve and close to the connecting pipe, or a second injection hole is provided on the connecting pipe, and the second injection hole is connected to a valve core.

[0007] By adopting the above scheme, during use, the gas extraction guide pipe is inserted into the mounting base and connecting pipe, and the first pipe body of both mounting bases is sealed to the guide pipe. The sealing plug is removed, and a uniformly mixed two-component polyurethane expanding agent (AB material) is injected through the grouting port into the grout storage chamber enclosed between the mounting base, connecting pipe, and guide pipe. After the grout storage chamber is filled with the expanding agent, the sealing plug is installed into the grouting port to seal it. The mounting base, guide pipe, and connecting pipe are then placed into the gas extraction hole that needs to be sealed. After the two-component polyurethane expanding agent (AB material) reacts and foams, the expanding agent first enters the inner space of the gas extraction bag sleeve through the first grouting hole, thus supporting the two gas extraction bags. After the gas extraction bags are supported, they form cylindrical bags, and the outer surface of the bags fits tightly against the wall of the gas extraction hole, thus forming a preliminary seal for the extraction hole. When the pressure generated by the expanding agent in the slurry storage chamber exceeds the opening pressure of the valve core, the valve core opens, and the expanding agent enters from the slurry storage chamber into the sealing section enclosed by the connecting pipe, the extraction hole, and the two bladders. The expanding agent fills the sealing section and, under pressure, enters the gaps in the hole wall of the extraction hole, thereby further enhancing the sealing effect. The slurry storage chamber formed by the mounting base, connecting pipe, and guide pipe can store more reagent and fill the sealing section with expanding agent, improving the sealing effect. There is no need to separately install a grouting pipe for grouting the sealing section, making operation simple and sealing efficiency high. Since the connecting pipe and mounting base are both fitted onto the guide pipe, the overall structure is more compact, occupying less radial dimension of the gas extraction hole. In actual use, the second exhaust pipe on the mounting base located at the inner end of the gas extraction hole is plugged with a plug or other sealing method. This prevents water present at the inner end of the extraction hole from flowing into the sealing section through the second exhaust pipe, ensuring that the sealing section is filled with expanding agent, thus guaranteeing sealing performance.

[0008] Preferably, a first venting groove is longitudinally formed on the outer side of the second tube body. One end of the first venting groove is located within the coverage area of ​​the gas bag sleeve, while the other end is located outside the coverage area of ​​the gas bag sleeve and close to the first tube body. The first venting groove facilitates the discharge of gas from the inner space of the gas bag sleeve, allowing the expanding agent to fill the inner space of the gas bag sleeve, thereby ensuring the sealing effect of the gas bag on the gas extraction hole.

[0009] Preferably, the first exhaust groove is provided with a first exhaust pipe. The first exhaust pipe facilitates the discharge of gas from the pouch. Preferably, a second venting groove is longitudinally formed on the outer side of the second tube body. One end of the second venting groove is located at the end of the second tube body near the first tube body, and the other end is near the connecting pipe. Both ends of the second venting groove are outside the coverage area of ​​the bladder sleeve. The second venting groove facilitates the discharge of gas and water from the sealed section between the two bladders formed after the two bladder sleeves are supported. The expanding agent can further fill the space within the sealed section, further enhancing the sealing effect.

[0010] Preferably, the second exhaust groove is provided with a second exhaust pipe, both ends of which are located outside the coverage area of ​​the pouch. The second exhaust pipe allows for convenient discharge of air and water.

[0011] Preferably, the connecting pipe and the mounting base are detachably connected. This detachable connection facilitates the installation and removal of the mounting base and the connecting pipe.

[0012] Preferably, the outer side of the second tube has a groove corresponding to the position of the first grouting hole, and the first grouting hole is located in the groove. Because the first grouting hole is located in the groove, when the expanding agent enters the bag from the first grouting hole, the contact area between the expanding agent and the bag is increased, making it easier for the expanding agent to inflate the bag.

[0013] Preferably, the second tube body has a first annular groove and a second annular groove on its outer side. Both the first and second annular grooves are located on the second tube body. One end of the pouch is fixed in the first annular groove, and the other end of the pouch is fixed in the second annular groove. In use, the two ends of the pouch are tied and fixed in the first and second annular grooves, further improving the sealing effect between the pouch and the second tube body. Simultaneously, the first and second annular grooves also provide positioning for the pouch, facilitating the positioning of the pouch during installation.

[0014] Preferably, the mounting base is in the shape of a cylindrical tube.

[0015] Preferably, the end of the second tube away from the first tube is connected to a third tube, the inner diameter of the third tube being smaller than the inner diameter of the second tube, and the inner diameter of the third tube being larger than the inner diameter of the first tube. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any novel effort.

[0016] Figure 1 This is a structural schematic diagram of the present invention, with a partial cross-sectional view of the first grouting hole, the grouting port, and the second grouting hole; Figure 2 yes Figure 1 An enlarged view of point a in the middle; Figure 3 yes Figure 1 A magnified view at point b in the middle; Figure 4 This is a three-dimensional structural diagram of the mounting base in this utility model from a first-view perspective; Figure 5 This is a three-dimensional structural diagram of the mounting base in this utility model from a second perspective; Figure 6 This is a schematic diagram of the structure of this utility model in use.

[0017] The reference numerals in the attached drawings include: connecting pipe 1, mounting base 2, first pipe body 3, second pipe body 4, third pipe body 5, first grouting hole 6, bladder sleeve 7, grouting port 8, sealing plug 9, second grouting hole 10, valve core 11, first vent groove 12, second vent groove 13, groove 14, first annular groove 15, second annular groove 16, guide pipe 17, extraction hole 18, sealing section 19, and second vent pipe 20. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the following description is provided in conjunction with the appendix. Figure 1-6 The present invention will be further described in detail below with reference to specific embodiments.

[0019] Please see Figure 1-6This embodiment provides an external injection sealing device, including a connecting pipe 1. Both ends of the connecting pipe 1 are connected to tubular mounting seats 2, preferably circular tubes, which are coaxially arranged with the connecting pipe 1. The mounting seat 2 includes a first tube body 3, a second tube body 4, and a third tube body 5 arranged longitudinally. The inner diameter of the second tube body 4 is larger than the inner diameters of the first tube body 3 and the third tube body 5, and the inner diameter of the third tube body 5 is larger than the inner diameter of the first tube body 3. The first tube body 3 is located at the end of the mounting seat 2 away from the connecting pipe 1, and the third tube body 5 is located at the end of the mounting seat 2 closer to the connecting pipe 1. A first grouting hole 6 is provided on the mounting seat 2, specifically located in the middle of the second tube body 4. A cylindrical bladder 7 is fitted onto the second tube body 4, with both ends of the bladder 7 sealed to the second tube body 4. The first grouting hole 6 is located within the coverage area of ​​the bladder 7. The gas bag sleeve 7 can be cylindrical or hexagonal, etc. The cylindrical gas bag sleeve 7 is preferably shaped to match the gas extraction hole 18 so that the gas bag formed when the gas bag sleeve 7 is in place fits snugly against the inner wall of the extraction hole 18. The mounting base 2 has a grouting port 8 located outside the coverage area of ​​the gas bag sleeve 7. The grouting port 8 communicates with the internal space of the second pipe body 4 of the mounting base 2, and a sealing plug 9 is detachably connected inside the grouting port 8. The sealing plug 9 can be threaded to the grouting port 8 or connected in other detachable ways, ensuring that the sealing plug 9 can seal the grouting port 8. A second grouting hole 10 is provided on the connecting pipe 1, or a second grouting hole 10 is provided on the mounting base 2 outside the coverage area of ​​the gas bag sleeve 7 and near the end of the connecting pipe 1. The second grouting hole 10 is connected to a valve core 11. Specifically, the valve core 11 can be a rubber sleeve, a cover plate, a filter element, a filter sleeve, or a microporous tube. If a rubber sleeve is used as the valve core, it is fitted onto the second grouting hole 10, sealing it. When the pressure at the second grouting hole 10 reaches a preset value, the rubber sleeve is forced open, thus opening the second grouting hole 10. If a cover plate is used as the valve core, it is adhered to the outside. When the pressure at the second grouting hole 10 reaches a preset value, the cover plate is forced open, thus opening the second grouting hole 10. This allows the internal space of the mounting base 2 to communicate with the external space. The mounting base 2 and the connecting pipe 1 are fitted onto the gas extraction guide pipe 17 and together with the guide pipe 17 form a grout storage chamber. In this embodiment, preferably, the second grouting hole 10 is located on the second pipe body 4, near the end of the connecting pipe 1. In some embodiments, the grouting port 8 can also be located on the connecting pipe 1.

[0020] Please continue reading. Figure 4 and Figure 5The second tube 4 has a first exhaust groove 12 longitudinally formed on its outer side. The lower end of the first exhaust groove 12 is located within the coverage area of ​​the pouch sleeve 7; the upper end of the first exhaust groove 12 is located outside the coverage area of ​​the pouch sleeve 7 and close to the first tube 3. Specifically, the upper end of the first exhaust groove 12 is flush with the upper end of the second tube 4.

[0021] To facilitate the venting of the sac, a first venting pipe is provided in the first venting groove 12, and the first venting pipe is embedded in the first venting groove 12.

[0022] Please see Figure 3 and Figure 5 To facilitate the discharge of gas and water from the sealing section 19 between the two bags, a second venting groove 13 is further provided longitudinally on the outer side of the second tube 4. One end of the second venting groove 13 is located at the end of the second tube 4 near the first tube 3, and the other end of the second venting groove 13 is near the connecting pipe 1. Both ends of the second venting groove 13 are outside the coverage area of ​​the bag sleeve 7. A second venting pipe 20 is provided inside the second venting groove 13, and both ends of the second venting pipe 20 are outside the coverage area of ​​the bag sleeve 7.

[0023] For ease of installation, the connecting pipe 1 and the mounting base 2 are detachably connected. Specifically, the third pipe body 5 is connected to the connecting pipe 1 via a threaded connection.

[0024] Please see Figure 4 and Figure 5 The mounting base 2 has a groove 14 on its outer side that corresponds to the position of the first grouting hole 6, and the first grouting hole 6 is located in the groove 14.

[0025] Please continue reading. Figure 4 and Figure 5 The mounting base 2 has a first annular groove 15 and a second annular groove 16 on its outer side. Both the first annular groove 15 and the second annular groove 16 are located on the second tube 4. One end of the bladder sleeve 7 is fixed in the first annular groove 15, and the other end of the bladder sleeve 7 is fixed in the second annular groove 16. The first grouting hole 6 is located between the first annular groove 15 and the second annular groove 16, and the second grouting hole 10 is located between the third tube 5 and the second annular groove 16. The first annular groove 15 and the second annular groove 16 facilitate the positioning of the bladder sleeve 7 during installation. Furthermore, binding the two ends of the bladder sleeve 7 within the first annular groove 15 and the second annular groove 16 further increases the sealing between the bladder sleeve 7 and the mounting base 2.

[0026] By adopting the above scheme, during use, the gas extraction guide pipe 17 is inserted into the mounting base 2 and the connecting pipe 1, and the first pipe body 3 of both mounting bases 2 is sealed to the guide pipe 17. The sealing method can specifically be by adding an annular sealing ring, filling the space between the first pipe body 3 and the guide pipe 17 with sealing filler, sealing the connection between the first pipe body 3 and the guide pipe 17 with sealing tape, or other existing sealing methods. Alternatively, the above sealing methods can be combined to ensure the sealing between the first pipe body 3 and the guide pipe 17. Remove the sealing plug 9, and inject a uniformly mixed two-component polyurethane expanding agent AB into the slurry storage chamber enclosed between the mounting base 2, the connecting pipe 1, and the guide pipe 17 through the grouting port 8. After the slurry storage chamber is filled with the expanding agent, install the sealing plug 9 into the grouting port 8 to seal it. Place the mounting base 2, the guide pipe 17, and the connecting pipe 1 into the gas extraction hole 18 that needs to be sealed. After the two components of the polyurethane expanding agent (AB material) react, they foam and expand. The expanding agent first enters the inner space of the two bladder sleeves 7 through the first injection hole 6, thus supporting the two bladder sleeves 7. After the bladder sleeves 7 are supported, they form cylindrical bladders, and the outer surface of the bladder sleeves 7 is tightly fitted with the wall of the gas extraction hole 18, thus forming a preliminary seal for the extraction hole 18. When the pressure generated by the expanding agent in the slurry storage chamber is greater than the opening pressure of the valve core 11, the valve core 11 opens, and the expanding agent enters from the slurry storage chamber into the sealing section 19 enclosed by the connecting pipe 1, the extraction hole 18, and the two bladders. The expanding agent fills the sealing section 19 and, under pressure, enters the gaps in the hole wall of the extraction hole 18, thereby further enhancing the sealing effect. The slurry storage chamber formed by the mounting base 2, the connecting pipe 1, and the guide pipe 17 can store more reagent and fill the sealing section 19 with expanding agent, improving the sealing effect. No separate grouting pipe is needed for grouting the sealing section 19, making the operation simple and the sealing efficiency high. Since both the connecting pipe 1 and the mounting base 2 are fitted onto the guide pipe 17, the overall structure is more compact, occupying less radial dimension of the gas extraction hole 18.

[0027] Two-component polyurethane expanding agent is a commonly used expanding agent in the prior art for pore sealing. It contains expanding agent A and expanding agent B. By adjusting the ratio of A and B, different reaction rates can be obtained, which can correspondingly change the sealing time.

[0028] It should be noted that words indicating direction in this article, such as "up" and "down," are all in the format of "upper" and "lower." Figure 1 The direction setting is for ease of description only and has no other specific meaning.

[0029] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0030] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An external injection type sealing device, characterized in that, The system includes a connecting pipe (1), both ends of which are connected to tubular mounting seats (2). The mounting seat (2) includes a first pipe body (3) and a second pipe body (4) connected longitudinally. The inner diameter of the second pipe body (4) is larger than the inner diameter of the first pipe body (3). The first pipe body (3) is located at the end of the mounting seat (2) away from the connecting pipe (1). The second pipe body (4) is provided with a first grouting hole (6). A cylindrical bladder sleeve (7) is fitted on the second pipe body (4). Both ends of the bladder sleeve (7) are connected to the second pipe body (4). The bodies (4) are sealed together, and the first grouting hole (6) is located within the coverage area of ​​the bladder sleeve (7); the connecting pipe (1) or the second pipe body (4) is provided with a grouting port (8), the grouting port (8) is located outside the coverage area of ​​the bladder sleeve (7), and a sealing plug (9) is detachably connected inside the grouting port (8); the mounting base (2) is located outside the coverage area of ​​the bladder sleeve (7) and close to the end of the connecting pipe (1) or the connecting pipe (1) is provided with a second grouting hole (10), and the second grouting hole (10) is connected to a valve core (11).

2. The external injection sealing device according to claim 1, characterized in that, The second tube (4) has a first exhaust groove (12) longitudinally opened on the outside. One end of the first exhaust groove (12) is located within the coverage area of ​​the pouch sleeve (7); the other end of the first exhaust groove (12) is located outside the coverage area of ​​the pouch sleeve (7) and close to the first tube (3).

3. The external injection sealing device according to claim 2, characterized in that, The first exhaust groove (12) is provided with a first exhaust pipe.

4. The external injection sealing device according to claim 1, characterized in that, The second tube (4) has a second exhaust groove (13) longitudinally opened on the outer side. One end of the second exhaust groove (13) is located on the end of the second tube (4) near the first tube (3), and the other end of the second exhaust groove (13) is near the connecting tube (1). Both ends of the second exhaust groove (13) are located outside the coverage area of ​​the sac cover (7).

5. An external injection sealing device according to claim 4, characterized in that, The second exhaust groove (13) is provided with a second exhaust pipe (20), and both ends of the second exhaust pipe (20) are located outside the coverage area of ​​the pouch sleeve (7).

6. An external injection sealing device according to any one of claims 1-5, characterized in that, The connecting pipe (1) is detachably connected to the mounting base (2).

7. An external injection sealing device according to claim 1, characterized in that, The second tube (4) has a groove (14) on its outer side that corresponds to the position of the first grouting hole (6), and the first grouting hole (6) is located in the groove (14).

8. An external injection sealing device according to claim 1, characterized in that, The second tube (4) has a first annular groove (15) and a second annular groove (16) on its outer side. The first annular groove (15) and the second annular groove (16) are both located on the second tube (4). One end of the sac sleeve (7) is fixed in the first annular groove (15), and the other end of the sac sleeve (7) is fixed in the second annular groove (16).

9. An external injection sealing device according to claim 1, characterized in that, The mounting base (2) is in the shape of a round tube.

10. An external injection sealing device according to claim 1, characterized in that, The second tube (4) is connected to a third tube (5) at the end away from the first tube (3). The inner diameter of the third tube (5) is smaller than the inner diameter of the second tube (4), and the inner diameter of the third tube (5) is larger than the inner diameter of the first tube (3).

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