Gas extraction device and extraction method
By using a combination device of porous breathable materials and extraction eye structure in soft coal seams, the problems of drilling instability and blockage during gas extraction in soft coal seams are solved, and efficient and safe gas extraction is achieved.
Patent Information
- Application Number
- CN202510679603.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2025-07-25
Smart Images
Figure CN120367645A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of coal mine gas drainage, and particularly to a gas drainage device and a drainage method. Background Art
[0002] Gas is a common harmful gas in the process of coal mine exploitation. Disasters such as gas explosions and outbursts caused by it significantly restrict the safe production of coal mines. To solve this problem, coal mines generally adopt the method of drilling drainage to control gas disasters, and install gas drainage pipes in the coal seam by drilling holes to collect and discharge gas. Soft coal seams account for a large proportion of the existing exploitable coal seams in China, and are widely distributed in mining areas such as Huainan-Huaibei and Panjiang. Soft coal seams generally have low permeability, high gas content, and fast desorption speed. A high-pressure area is easily formed in front of the gas drainage borehole, which is likely to induce gas dynamic phenomena such as hole spraying.
[0003] Soft coal seams usually have low mechanical strength and strong plasticity, and often show non-uniformity in geological structures. These characteristics lead to the instability of the coal seam during the drilling process. Especially when the borehole is just formed, due to the insufficient consolidation of the coal seam, the hole wall is prone to collapse, resulting in the reduction of the borehole diameter, which may cause the gas drainage pipe to fail to reach the predetermined working depth, directly affecting the smooth progress of gas drainage operations, thus increasing the construction cost and operation risk. In addition, after the gas drainage pipe is pushed to a certain depth, due to the continuous collapse of the soft coal seam, the drainage pipe is often blocked or the drainage hole is closed, greatly reducing the gas drainage effect. At present, although some technical solutions have been proposed for the design of drainage pipes and borehole support methods for soft coal seams, most of the existing technologies only optimize for a single problem and fail to comprehensively solve various challenges in soft coal seams. Some existing technologies for strengthening the borehole wall, such as the grouting reinforcement technology for the surrounding rock of the borehole, although can alleviate the borehole instability problem to a certain extent, but face many problems such as high input cost and unstable drainage effect. In addition, in some other solutions, slag removal devices and support devices are added to the drainage pipe, but the application of these technologies still cannot effectively prevent coal chips generated continuously during the long-term drainage process from entering the drainage hole, and may still cause the drainage pipe to be blocked, further affecting the gas drainage efficiency. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a gas drainage device and a drainage method to improve the drainage efficiency and reduce the drainage cost.
[0005] To solve the above technical problem, the technical solution of the present invention is as follows:
[0006] A gas drainage device, comprising:
[0007] A plurality of first extraction pipes, the plurality of first extraction pipes are arranged in a straight line and the ends of two adjacent first extraction pipes are fixedly connected;
[0008] A plurality of second extraction pipes, the plurality of second extraction pipes are sleeved in the plurality of first extraction pipes, the plurality of second extraction pipes are arranged in a straight line in the straight pipeline formed by the plurality of first extraction pipes, and one end of the straight pipeline formed by the plurality of second extraction pipes is flush with one end of the straight pipeline formed by the plurality of first extraction pipes. Each second extraction pipe of the plurality of second extraction pipes is provided with extraction holes and hole baffles on its pipe body; and
[0009] A drill, the drill is arranged at one end of the straight pipeline formed by the plurality of second extraction pipes and is fixedly connected to the second extraction pipe at this end, and the outer diameter of the drill is the same as the outer diameter of the first extraction pipe.
[0010] In one embodiment, each first extraction pipe of the plurality of first extraction pipes is an annular pipe including an outer wall and an inner wall, and a porous breathable material is filled between the outer wall and the inner wall.
[0011] In one embodiment, each end of each first extraction pipe of the plurality of first extraction pipes is respectively provided with a first internal thread and an external thread, and the plurality of first extraction pipes are fixedly connected by threads.
[0012] In one embodiment, the plurality of second extraction pipes include:
[0013] A first inner pipe, one end of the first inner pipe is flush with one end of the straight pipeline formed by the plurality of first extraction pipes and this end of the first inner pipe is fixedly connected to the drill; and
[0014] A plurality of second inner pipes, the plurality of second inner pipes are arranged in a straight line in sequence at the other end of the first inner pipe, the pipe diameter of the second inner pipe is the same as the pipe diameter of the first inner pipe, and the lengths of the first inner pipe, the second inner pipe and the first extraction pipe are the same.
[0015] In one embodiment, a first flange is provided at the other end of the first inner pipe; second flanges are provided at both ends of the second inner pipe.
[0016] In one embodiment, the outer wall of the first flange and the outer wall of the second flange are respectively attached to the inner wall of the first extraction pipe.
[0017] In one embodiment, a second internal thread matching the first internal thread on the first extraction pipe is provided at one end of the first inner pipe.
[0018] In one embodiment, multiple rows of extraction holes are evenly distributed on the first inner pipe and the second inner pipe, and the extraction holes are arranged in a straight line on the first inner pipe and the second inner pipe.
[0019] In one embodiment, the drill rig includes:
[0020] A drill bit, with a slag removal hole opened at one end of the drill bit;
[0021] A power device, which is arranged at the other end of the drill bit, and the outer diameter of the power device is the same as the outer diameter of the first extraction pipe; and
[0022] A connecting shaft, one end of the connecting shaft is fixedly connected to one end of the power device, the other end of the connecting shaft is fixedly connected to one end of the first inner pipe, and the slag removal hole, the connecting shaft, the first inner pipe and the second inner pipe communicate with each other.
[0023] An embodiment of the present invention also provides an extraction method based on the above-mentioned gas extraction device, including the following steps:
[0024] Step 1: Insert a first extraction pipe into the pipe body of the first inner pipe. After aligning one end of the first extraction pipe with one end of the first inner pipe, fixedly connect the drill rig to one end of the first inner pipe. After starting the drill rig, push the drill rig, the first extraction pipe and the first inner pipe into the unstable borehole;
[0025] Step 2: When the drill rig, the first extraction pipe and the first inner pipe in Step 1 are gradually pushed into the unstable borehole, fixedly connect one end of a second inner pipe to the other end of the first inner pipe, then insert another first extraction pipe along the pipe body of the second inner pipe, and thread-connect it with the first extraction pipe in Step 1. Continue to push the extraction pipe after connecting the second inner pipe into the unstable borehole;
[0026] Step 3: According to the borehole depth, connect multiple second inner pipes through second flange plates, synchronously insert multiple first extraction pipes along the pipe body of the second inner pipe, and further push the extraction pipe connected by multiple pipe sections into the unstable borehole step by step. At the same time, discharge the broken coal slag out of the hole in the order of the slag removal hole, the connecting shaft, the first inner pipe and multiple second inner pipes;
[0027] Step 4: After the gas extraction device completely enters the bottom of the unstable borehole, perform a sealing operation at the borehole opening and carry out long-term gas extraction work.
[0028] The above solution of the present invention has at least the following beneficial effects:
[0029] The gas drainage device and method provided by the above solution of the present invention, wherein the drainage device includes a plurality of first drainage pipes, a plurality of second drainage pipes and a drill rig; the plurality of first drainage pipes are arranged in a straight line and the ends of two adjacent first drainage pipes are fixedly connected; the plurality of second drainage pipes are sleeved in the plurality of first drainage pipes, and the plurality of second drainage pipes are arranged in a straight line in the straight pipeline formed by the plurality of first drainage pipes, and one end of the straight pipeline formed by the plurality of second drainage pipes is flush with one end of the straight pipeline formed by the plurality of first drainage pipes. Each second drainage pipe of the plurality of second drainage pipes is provided with drainage holes and hole baffles on its pipe body; the drill rig is arranged at one end of the straight pipeline formed by the plurality of second drainage pipes and is fixedly connected to the second drainage pipe at this end, and the outer diameter of the drill rig is the same as the outer diameter of the first drainage pipe. The above drainage device is easy to operate, has a good hole protection effect, smooth gas drainage, can be reused, and is convenient to promote and use in the process of gas drainage in soft coal seams. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 FIG. 6 is a three-dimensional structural diagram of the gas drainage device provided by an embodiment of the present invention;
[0031] Figure 2 FIG. 10 is a three-dimensional structural diagram of the first drainage pipe provided by an optional embodiment of the present invention;
[0032] Figure 3 FIG. 14 is a three-dimensional structural diagram of the installation of the second inner pipe and the drill bit provided by an optional embodiment of the present invention;
[0033] Figure 4 FIG. 18 is a three-dimensional structural diagram of the second inner pipe provided by an optional embodiment of the present invention.
[0034] Figure 5 FIG. 22 is a structural diagram of a normal drill hole and an unstable drill hole provided by an optional embodiment of the present invention.
[0035] Figure 6 FIG. 26 is a working diagram of the gas drainage device provided by an optional embodiment of the present invention.
[0036] REFERENCE NUMERALS IN THE DRAWINGS: 1, first drainage pipe; 11, outer wall; 12, porous breathable material; 13, inner wall; 14, first internal thread; 15, external thread; 2, first inner pipe; 21, first flange; 22, first internal thread; 3, second inner pipe; 31, second flange; 4, drill rig; 41, drill bit; 42, slag removal hole; 43, power device; 44, connecting shaft; 5, drainage hole; 6, hole baffle; 7, roadway; 8, normal drill hole; 9, unstable drill hole; 10, coal slag; 11, repaired drill hole. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0037] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.
[0038] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments can be practiced without one or more of these specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.
[0039] References to "one embodiment" or "an embodiment" throughout the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" throughout the specification do not necessarily all refer to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.
[0040] In the following description, for the purpose of clearly showing the structure and working mode of the present invention, many directional terms will be used for description. However, the orientation or positional relationship indicated by "front", "rear", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0041] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0042] As Figure 1As shown in the figure, an embodiment of the present invention provides a gas drainage device, which includes a plurality of first drainage pipes 1, a plurality of second drainage pipes, and a drilling rig 4. Among them, the plurality of first drainage pipes 1 are arranged in a straight line, and the ends of two adjacent first drainage pipes 1 are fixedly connected; the plurality of second drainage pipes are sleeved inside the plurality of first drainage pipes 1, and the plurality of second drainage pipes are arranged in a straight line within the straight pipeline formed by the plurality of first drainage pipes 1, and one end of the straight pipeline formed by the plurality of second drainage pipes is flush with one end of the straight pipeline formed by the plurality of first drainage pipes 1. On the pipe body of each second drainage pipe among the plurality of second drainage pipes, a drainage eyelet 5 and an eyelet baffle 6 are provided; the drilling rig 4 is arranged at one end of the straight pipeline formed by the plurality of second drainage pipes and is fixedly connected to the second drainage pipe at this end. The outer diameter of the drilling rig 4 is the same as the outer diameter of the first drainage pipe 1.
[0043] In this embodiment, the plurality of first drainage pipes 1 are sequentially connected to form a first straight pipeline, the plurality of second drainage pipes are sequentially connected to form a second straight pipeline, the second straight pipeline is sleeved inside the first straight pipeline, and the two ends are flush.
[0044] Preferably, at both ends of each first drainage pipe among the plurality of first drainage pipes 1, a first internal thread 14 and an external thread 15 are respectively provided, and the plurality of first drainage pipes 1 are fixedly connected through the cooperation of the first internal thread 14 and the external thread 15.
[0045] The plurality of second drainage pipes are provided with drainage eyelets 5, and one eyelet baffle 6 is provided on each drainage eyelet 5; as Figure 4 shown in the figure, the eyelet baffle 6 faces the inside of the second drainage pipe and is inclined. One end of the eyelet baffle 6 is fixedly connected to the inner wall of the second drainage pipe, and the other end is away from the inner wall of the second drainage pipe, so that the plate body of the eyelet baffle 6 forms a certain angle with the inner wall of the second drainage pipe; the setting of the eyelet baffle 6 can, on the one hand, prevent the coal slag from blocking the drainage eyelet 5 during the slag discharge process of the second drainage pipe, and on the other hand, can avoid hindering the discharge of the coal slag; preferably, the eyelet baffle 6 can be a part of the inner wall of the second drainage pipe reserved when the drainage eyelet 5 is opened (that is, the eyelet baffle 6 is integrally formed with the second drainage pipe), or can be independently installed on the inner wall of the second drainage pipe and semi-cover the drainage eyelet 5.
[0046] Here, the drilling rig 4 can be an explosion-proof electric drilling rig. The outer diameter of the drilling rig 4, the outer diameter of the first drainage pipe 1, and the aperture of the unstable borehole 9 are the same, which can effectively penetrate the deformation conditions such as the subsidence, collapse, and closure of the unstable borehole 9, improving the drainage efficiency while avoiding safety risks.
[0047] In this embodiment, the main body of the gas drainage device adopts a tubular structure that is easy to assemble and disassemble, which can be applied to the repair of unstable boreholes 9 in soft coal seams with different lengths and angles, thereby improving the applicability of the drainage device.
[0048] In an alternative embodiment of the present invention, each of the plurality of first extraction pipes 1 is an annular pipe including an outer wall 11 and an inner wall 13, and a porous breathable material 12 is filled between the outer wall 11 and the inner wall 13.
[0049] In this embodiment, the outer wall 11 and the inner wall 13 can adopt a steel skeleton structure, which can reduce the overall weight of the entire extraction device on the one hand and improve the stiffness of the device on the other hand;
[0050] A high-strength porous breathable material 12 is filled between the outer wall 11 and the inner wall 13, which can better protect the borehole wall and at the same time form a smooth flow channel for gas from the coal body to the porous breathable material 12 and then to the inside of the second extraction pipe; here, the porous breathable material can be a porous high-toughness breathable sponge or other materials with certain strength, toughness and not easily deformed. The porous setting is beneficial to the entry of gas while blocking crushed coal.
[0051] In an alternative embodiment of the present invention, the plurality of second extraction pipes include a first inner pipe 2 and a plurality of second inner pipes 3. Among them, one end of the first inner pipe 2 is flush with one end of the straight pipeline formed by the plurality of first extraction pipes 1, and this end of the first inner pipe 2 is fixedly connected to the drill 4; the plurality of second inner pipes 3 are arranged in a straight line in sequence at the other end of the first inner pipe 2. The diameter of the second inner pipe 3 is the same as that of the first inner pipe 2, and the lengths of the first inner pipe 2, the second inner pipe 3 and the first extraction pipe 1 are the same.
[0052] In this embodiment, the first inner pipe 2 and the second inner pipe 3 are of the same size, and their lengths are both the same as that of the first extraction pipe 1 for easy installation; here, the combination of the first inner pipe 2 and the plurality of second inner pipes 3 can flexibly adjust the length of the extraction device to improve the applicability of the extraction device;
[0053] Here, one end of the first inner pipe 2 is provided with a second internal thread 22 that matches the first internal thread 14 on the first extraction pipe 1; after the first inner pipe 2 is sleeved into the first extraction pipe 1, the first inner pipe 2 and one end of the first extraction pipe 1 are fixedly connected by the cooperation of the second internal thread 22 and the first internal thread 14;
[0054] Preferably, a first flange 21 is provided at the other end of the first inner pipe 2; second flanges 31 are provided at both ends of the second inner pipe 3; the other end of the first inner pipe 2 can be fixedly connected to one end of the adjacent second inner pipe 3 through the first flange 21 and the second flange 31, and the plurality of second inner pipes 3 are fixedly connected to each other through the second flange 31.
[0055] More preferably, the outer walls of the first flange 21 and the second flange 31 are respectively in contact with the inner wall 13 of the first extraction pipe 1, so that there are gaps between the inner wall 13 and the outer wall of the first inner pipe 2, and between the inner wall 13 and the outer wall of the second inner pipe 3. Here, the remaining gap is to allow the gas inhaled from the outside of the entire extraction pipe to be better discharged through the inner pipe, and to prevent the crushed coal on the porous elastic material from being too close to the extraction holes, resulting in a reduction in extraction efficiency. Therefore, a moving gap is left between the two.
[0056] In an alternative embodiment of the present invention, multiple rows of extraction holes 5 are uniformly arranged on the first inner pipe 2 and the second inner pipe 3, and the extraction holes 5 are arranged in a straight line on the first inner pipe 2 and the second inner pipe 3.
[0057] In this embodiment, multiple rows of extraction holes 5 are arranged in a straight line on the first inner pipe 2 and the second inner pipe 3, and multiple rows of extraction holes 5 are uniformly formed on the outer circumferences of the first inner pipe 2 and the second inner pipe 3, thereby improving the extraction efficiency.
[0058] In an alternative embodiment of the present invention, the drill rig 4 includes a drill bit 41, a power device 43, and a connecting shaft 44. Among them, a slag removal hole 42 is formed at one end of the drill bit 41; the power device 43 is arranged at the other end of the drill bit 41, and the outer diameter of the power device 43 is the same as the outer diameter of the first extraction pipe 1; one end of the connecting shaft 44 is fixedly connected to one end of the power device 43, and the other end of the connecting shaft 44 is fixedly connected to one end of the first inner pipe 2, and the slag removal hole 42, the connecting shaft 44, the first inner pipe 2, and the second inner pipe 3 are mutually communicated.
[0059] In this embodiment, the power device 43 is arranged between the drill bit 41 and the connecting shaft 44. The power device 43 can be an electric motor, one end of which is in transmission connection with the drill bit 41 and the other end is fixedly connected to the connecting shaft 44 to provide power for the rotation of the drill bit 41; here, the power device 43 is a cylinder as a whole, and its outer diameter is the same as the outer diameter of the first extraction pipe 1 and the aperture of the unstable borehole 9, so as to effectively penetrate the deformation conditions such as the sinking, collapse, and closure of the unstable borehole 9, and while improving the extraction efficiency, it can also avoid safety risks;
[0060] The slag removal holes 42 are uniformly formed on the drill bit 41; here, the slag removal holes 42, the connecting shaft 44, the first inner pipe 2, and the second inner pipe 3 are mutually communicated to facilitate the removal of coal slag from the unstable borehole 9.
[0061] As Figure 5 shown, the difference between the unstable borehole 9 in the soft coal seam and the normal borehole 8 is that it will undergo instability phenomena such as sinking, collapse, and closure in a short time after the hole is formed, and a large amount of coal slag 10 will accumulate in the hole. Based on this, an embodiment of the present invention also provides a extraction method for a gas extraction device based on the above embodiment, including the following steps:
[0062] Step 1: Insert a first extraction pipe 1 into the pipe body of the first inner pipe 2. After aligning one end of the first extraction pipe 1 with one end of the first inner pipe 2, fixedly connect the drill rig 4 to one end of the first inner pipe 2. After starting the drill rig 4, push the drill rig 4, the first extraction pipe 1, and the first inner pipe 2 into the unstable borehole;
[0063] Step 2: When the drill rig 4, the first extraction pipe 1, and the first inner pipe 2 in Step 1 are gradually pushed into the unstable borehole, fixedly connect one end of a second inner pipe 3 to the other end of the first inner pipe 2. Then insert another first extraction pipe 1 into the pipe body of the second inner pipe 3 and thread-connect it to the first extraction pipe 1 in Step 1. Continue to push the extraction pipe connected to the second inner pipe 3 into the unstable borehole;
[0064] Step 3: According to the borehole depth, connect multiple second inner pipes 3 through second flange plates 31, synchronously insert multiple first extraction pipes 1 along the pipe body of the second inner pipe 3, further push the extraction pipe with multiple pipe sections connected into the unstable borehole step by step, and at the same time discharge the broken coal slag out of the hole in the order of the slag removal hole 42, the connecting shaft 44, the first inner pipe 2, and multiple second inner pipes 3;
[0065] Step 4: After the gas extraction device completely enters the bottom of the unstable borehole, perform a sealing operation at the borehole opening and carry out long-term gas extraction work.
[0066] In this embodiment, as Figure 6As shown in the figure, first, a first gas extraction pipe 1 is sleeved along the pipe body of the first inner pipe 2 in the roadway 7. Further, the first internal thread 22 at the upper end of the first inner pipe 2 is threadedly connected to the external thread 15 of the first gas extraction pipe 1. The drill 4 is started, and this section of the gas extraction pipe is pushed into the unstable borehole 9. When the first section of the gas extraction pipe is gradually pushed into the unstable borehole 9, the second flange 31 of a second inner pipe 3 is connected to the first flange 21 of the first inner pipe 2. Then, another first gas extraction pipe 1 is sleeved along the pipe body of the second inner pipe 3 and is threadedly connected to the previous first gas extraction pipe 1. The two sections of the gas extraction pipe are continuously pushed into the unstable borehole 9. According to the borehole depth, the second inner pipes 3 are connected by the second flanges 31, and multiple first gas extraction pipes 1 are sleeved synchronously along the pipe body. Further, the gas extraction pipe formed by connecting multiple pipe bodies is gradually pushed into the unstable borehole 9. During the pushing process, the drill bit 41 driven by the power device 43 penetrates the deformation conditions such as the subsidence, collapse, and closure of the unstable borehole 9. Combined with the extraction device in the roadway 7, the broken coal slag 10 is discharged out of the hole along the slag removal hole 42, the connecting shaft 44, the first inner pipe 2, and multiple second inner pipes 3 in sequence. After the gas extraction device completely enters the bottom of the unstable borehole 9, a sealing operation is carried out at the borehole opening, and then a long-term gas extraction work is carried out. Subsequently, the unstable borehole 9 is supported by the outer wall 11 and cannot undergo large deformations. A small amount of the fallen coal slag 10 will be blocked by the high-strength porous breathable material 12, preventing it from blocking the extraction eyelets 5, and thus a repaired borehole 11 is formed. After the gas extraction is completed, the gas extraction pipe is gradually disassembled in the order of the first gas extraction pipe 1 first and then the second inner pipe 3. For the last section of the gas extraction pipe, the first gas extraction pipe 1 is disassembled first, and then the first inner pipe 2 is disassembled, cleaned, and used for the gas extraction work in the next stage.
[0067] The gas extraction device and the gas extraction method provided by the above embodiments of the present invention; wherein, by opening extraction eyelets on the first inner pipe and the second inner pipe, and arranging inward eyelet baffles on the extraction eyelets, it can not only prevent the coal slag from blocking the extraction eyelets during the slag discharge process of the first inner pipe and the second inner pipe, but also does not hinder the discharge of the coal slag; the outer wall and the inner wall of the first gas extraction pipe adopt a steel skeleton structure, which can reduce the overall weight of the gas extraction device. Combined with the high-strength porous breathable material filled between the outer wall and the inner wall, it can better protect the borehole wall, and at the same time form a smooth flow channel for gas from the coal body to the high-strength porous breathable material and then to the inner pipe; the gas extraction device uses an explosion-proof drill with the same diameter as the unstable borehole, which can effectively penetrate the deformation conditions such as the subsidence, collapse, and closure of the unstable borehole, avoiding safety risks while improving efficiency; in addition, the main structure of the gas extraction device is easy to assemble and disassemble, with a stable structure, and can protect the borehole once, being applicable to the repair of unstable boreholes in soft coal seams with different lengths and different angles, and can be reused, facilitating popularization and use during the gas extraction process in soft coal seams.
[0068] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.
[0069] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A gas drainage device, characterized in that, Including: A plurality of first extraction pipes (1), the plurality of first extraction pipes (1) are arranged in a straight line, and the ends of two adjacent first extraction pipes (1) are fixedly connected; A plurality of second extraction pipes, the plurality of second extraction pipes are sleeved in the plurality of first extraction pipes (1), the plurality of second extraction pipes are arranged in a straight line in the straight pipeline formed by the plurality of first extraction pipes (1), and one end of the straight pipeline formed by the plurality of second extraction pipes is flush with one end of the straight pipeline formed by the plurality of first extraction pipes (1). Extraction holes (5) and hole baffles (6) are provided on the pipe body of each second extraction pipe among the plurality of second extraction pipes; and A drill (4), the drill (4) is arranged at one end of the straight pipeline formed by the plurality of second extraction pipes and is fixedly connected to the second extraction pipe at this end, and the outer diameter of the drill (4) is the same as the outer diameter of the first extraction pipe (1).
2. The gas drainage device according to claim 1, wherein Each of the plurality of first extraction pipes (1) is an annular pipe including an outer wall (11) and an inner wall (13), and a porous breathable material (12) is filled between the outer wall (11) and the inner wall (13).
3. The gas drainage device according to claim 1, characterized in that, At both ends of each of the plurality of first extraction pipes (1), a first internal thread (14) and an external thread (15) are respectively provided, and the plurality of first extraction pipes (1) are fixedly connected by threads.
4. The gas drainage device according to claim 1, characterized in that, The plurality of second extraction pipes include: A first inner pipe (2), one end of the first inner pipe (2) is flush with one end of the straight pipeline formed by the plurality of first extraction pipes (1), and this end of the first inner pipe (2) is fixedly connected to the drill (4); and A plurality of second inner pipes (3), the plurality of second inner pipes (3) are arranged in a straight line in sequence at the other end of the first inner pipe (2), the pipe diameter of the second inner pipe (3) is the same as the pipe diameter of the first inner pipe (2), and the lengths of the first inner pipe (2), the second inner pipe (3) and the first extraction pipe (1) are the same.
5. The gas drainage device according to claim 4, characterized in that, A first flange (21) is provided at the other end of the first inner pipe (2); second flanges (31) are provided at both ends of the second inner pipe (3).
6. The gas drainage device according to claim 5, characterized in that The outer wall of the first flange (21) and the outer wall of the second flange (31) are respectively attached to the inner wall (13) of the first extraction pipe (1).
7. The gas drainage device according to claim 1, characterized in that, A second internal thread (22) matching the first internal thread (14) on the first extraction pipe (1) is provided at one end of the first inner pipe (2).
8. The gas drainage device according to claim 4, characterized in that, Multiple rows of extraction holes (5) are evenly distributed on the first inner pipe (2) and the second inner pipe (3), and the extraction holes (5) are arranged in a straight line on the first inner pipe (2) and the second inner pipe (3).
9. The gas drainage device according to claim 1, characterized in that, The drill (4) includes: A drill bit (41), a slag removal hole (42) is opened at one end of the drill bit (41); A power device (43), the power device (43) is arranged at the other end of the drill bit (41), and the outer diameter of the power device (43) is the same as the outer diameter of the first extraction pipe (1); and A connecting shaft (44), one end of the connecting shaft (44) is fixedly connected to one end of the power device (43), the other end of the connecting shaft (44) is fixedly connected to one end of the first inner pipe (2), and the slag removal hole (42), the connecting shaft (44), the first inner pipe (2) and the second inner pipe (3) communicate with each other.
10. A gas drainage method based on the gas drainage device according to any one of claims 1 to 9, characterized in that, Including the following steps: Step 1: Insert a first extraction pipe (1) into the pipe body of the first inner pipe (2). After aligning one end of the first extraction pipe (1) with one end of the first inner pipe (2), fixedly connect the drill rig (4) to one end of the first inner pipe (2). After starting the drill rig (4), push the drill rig (4), the first extraction pipe (1) and the first inner pipe (2) into the unstable borehole. Step 2: When the drill rig (4), the first extraction pipe (1) and the first inner pipe (2) in Step 1 are gradually pushed into the unstable borehole, fixedly connect one end of a second inner pipe (3) to the other end of the first inner pipe (2). Then insert another first extraction pipe (1) along the pipe body of the second inner pipe (3) and make a threaded connection with the first extraction pipe (1) in Step 1. Continue to push the extraction pipe connected to the second inner pipe (3) into the unstable borehole. Step 3: According to the borehole depth, connect multiple second inner pipes (3) through second flange plates (31), synchronously insert multiple first extraction pipes (1) along the pipe body of the second inner pipe (3), and further push the extraction pipe connected by multiple pipe sections into the unstable borehole step by step. At the same time, discharge the broken coal slag out of the hole in the order of the slag removal hole (42), the connecting shaft (44), the first inner pipe (2) and multiple second inner pipes (3). Step 4: After the gas extraction device completely enters the bottom of the unstable borehole, perform a sealing operation at the borehole opening and carry out long-term gas extraction work.