Rapid hole fixing device for coal mine underground gas extraction drilling

Abstract

The utility model provides a coal mine underground gas extraction drill hole rapid hole fixing device which comprises a hole fixing pipe, an expansion capsule is wrapped on the surface of the hole fixing pipe, two ends of the expansion capsule are respectively connected with a first inner pagoda joint and a second inner pagoda joint, an outer pagoda joint is arranged between the hole fixing pipe and the second inner pagoda joint, and the outer pagoda joint is connected with the expansion capsule. The sealing ring is arranged in the outer pagoda connector, one end of the outer pagoda connector and one end of the first inner pagoda connector are connected with a first water inlet pipe and a second water inlet pipe respectively, and a first valve and a second valve are installed on the first water inlet pipe and the second water inlet pipe respectively. The coal mine underground gas extraction drilling rapid hole fixing device is easy and convenient to install, economical, practical, high in applicability and high in working efficiency, the hole fixing waiting time is shortened, the length of the hole fixing section is adjusted by connecting a plurality of hole fixing devices in series, different expansion pressures are applied to the expansion capsule, and tight hole fixing of an extraction hole is achieved.

Description

Technical Field

[0001] This utility model relates to the field of underground gas drilling and extraction in coal mines, and in particular to a rapid hole-fixing device for underground gas extraction drilling in coal mines. Background Technology

[0002] Coal mine gas accidents are one of the main threats to coal mine safety. In order to ensure the safety of underground coal mine operations, pre-drainage of gas through boreholes is carried out to reduce the gas content in the coal seam and achieve the goal of safe production. Borehole extraction is an important means of coal mine gas control. By extracting gas, the gas content in the mine can be significantly reduced, thereby reducing the occurrence of coal mine gas accidents.

[0003] Currently, the main sealing technologies used domestically and internationally include mechanical cement mortar sealing, sealing device sealing, polyurethane resin sealing, capsule sealing, and "two-plug-one-injection" sealing. Existing sealing technologies suffer from problems such as complex operation processes, high labor intensity, high cost, and incomplete sealing. Operators often fail to meet the theoretical sealing process requirements during construction. In particular, when using mechanical cement mortar sealing, the sealing material needs to be transported downhole, resulting in high labor intensity. Furthermore, after sealing, the gas drilling operation can only proceed after the cement has solidified, delaying the construction period. In addition, most existing sealing devices use the "two-plug-one-injection" sealing process, where the sealing fluid and sealing device remain separate, requiring high overall operation standards and complex construction, making it difficult to achieve the theoretical sealing requirements on-site.

[0004] Therefore, it is necessary to provide a rapid hole-fixing device for underground gas drainage boreholes in coal mines to solve the above-mentioned technical problems. Utility Model Content

[0005] This utility model provides a rapid hole-fixing device for underground gas drainage boreholes in coal mines, which solves the problem that existing sealing devices mostly adopt the "two-plug-one-injection" sealing process, in which the sealing fluid and sealing device are still in a separate state, the overall operation requirements are high, the construction is complicated, and it is difficult to achieve the theoretical sealing requirements on site.

[0006] To solve the above-mentioned technical problems, this utility model provides a rapid hole-fixing device for underground gas drainage boreholes in coal mines, comprising:

[0007] A solid hole tube, the surface of which is wrapped with an expansion capsule, the two ends of which are respectively connected to a first inner pagoda connector and a second inner pagoda connector, and an outer pagoda connector is provided between the solid hole tube and the second inner pagoda connector;

[0008] A sealing ring is disposed inside the outer pagoda connector. One end of the outer pagoda connector and the first inner pagoda connector are respectively connected to a first water inlet pipe and a second water inlet pipe. A first valve and a second valve are respectively installed on the first water inlet pipe and the second water inlet pipe.

[0009] Preferably, one end of each of the fixed-hole tubes is connected to a flange, and the surface of the flange is provided with multiple bolt holes.

[0010] Preferably, the expansion capsule is made of highly elastic and wear-resistant rubber.

[0011] Preferably, the first inner pagoda connector and the second inner pagoda connector are used for sealing the expansion capsule.

[0012] Preferably, the sealing ring is used to seal the liquid inside the expansion capsule.

[0013] Preferably, the end of the expansion capsule is provided with an installation component, the installation component including a threaded connecting seat, and a threaded connecting head is threadedly connected to the surface of the threaded connecting seat.

[0014] Preferably, a pipe is installed between the threaded connector and the threaded connector head.

[0015] Compared with related technologies, the rapid hole-fixing device for underground gas drainage boreholes provided by this utility model has the following beneficial effects:

[0016] This utility model provides a rapid hole-fixing device for underground gas drainage boreholes in coal mines. It is easy to install, economical, practical, highly applicable, and efficient, reducing hole-fixing waiting time. By connecting several hole-fixing devices in series to adjust the length of the hole-fixing section and applying different expansion pressures to the expansion capsule, it achieves tight hole-fixing of the drainage borehole, ensuring the construction and sealing effect of subsequent gas drainage boreholes. This device can adapt to the hole-fixing of gas drainage boreholes with different diameters, ensuring effective sealing length and hole-fixing quality. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a first embodiment of a rapid hole-fixing device for underground gas extraction drilling in coal mines provided by this utility model;

[0018] Figure 2 for Figure 1 The enlarged schematic diagram of part A shown below;

[0019] Figure 3 for Figure 1 The enlarged schematic diagram of section B is shown below;

[0020] Figure 4A schematic diagram of the second embodiment of a rapid hole-fixing device for underground gas extraction drilling in coal mines provided by this utility model;

[0021] Figure 5 for Figure 4 The enlarged schematic diagram of section C is shown.

[0022] Labels in the diagram: 1. Fixed hole pipe; 2. Flange; 3. Bolt hole; 4. Expansion capsule; 5. First inner pagoda joint; 6. Second inner pagoda joint; 7. Outer pagoda joint; 8. Sealing ring; 9. First valve; 10. First inlet pipe; 11. Second inlet pipe; 12. Second valve;

[0023] 13. Mounting components; 131. Threaded connector; 132. Threaded connector head; 133. Pipe. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] First Embodiment

[0026] Please refer to the following: Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of a rapid hole-fixing device for underground gas extraction drilling in coal mines provided by this utility model; Figure 2 for Figure 1 The enlarged schematic diagram of part A shown below; Figure 3 for Figure 1 The enlarged schematic diagram of section B is shown. A rapid hole-fixing device for underground gas drainage boreholes in coal mines includes:

[0027] A solid hole tube 1, the surface of which is covered with an expansion capsule 4, the two ends of which are respectively connected to a first inner pagoda connector 5 and a second inner pagoda connector 6, and an outer pagoda connector 7 is provided between the solid hole tube 1 and the second inner pagoda connector 6.

[0028] A sealing ring 8 is disposed inside the outer pagoda connector 7. One end of the outer pagoda connector 7 and the first inner pagoda connector 5 are respectively connected to a first water inlet pipe 10 and a second water inlet pipe 11. A first valve 9 and a second valve 12 are respectively installed on the first water inlet pipe 10 and the second water inlet pipe 11.

[0029] One end of each of the fixed-hole tubes 1 is connected to a flange 2, and the surface of the flange 2 is provided with multiple bolt holes 3.

[0030] The expansion capsule 4 is made of high-elasticity and wear-resistant rubber.

[0031] The first inner pagoda connector 5 and the second inner pagoda connector 6 are used for sealing the expansion capsule 4.

[0032] The sealing ring 8 is used to seal the liquid inside the expansion capsule 4.

[0033] During gas drainage drilling, the blowout preventer is connected to the fixed-hole pipe 1 via bolt holes 3. An expansion capsule 4 is coaxially wrapped around the fixed-hole pipe 1. The expansion capsule is made of high-elasticity, wear-resistant rubber, and the inner diameter of its cylindrical hole is the same as the outer diameter of the gas drainage pipe. A wire mesh is embedded inside the expansion capsule to reinforce it.

[0034] One end of the expansion capsule 4 is fastened to the solid hole tube 1 through the first inner pagoda connector 5, which serves to seal the expansion capsule. The first inner pagoda connector 5 and the solid hole tube 1 are fixedly connected by welding.

[0035] The second inner pagoda connector 6 and the outer pagoda connector 7 are coaxially installed on the fixed hole tube 1. The outer pagoda connector 7 fastens the expansion capsule 4 to the second inner pagoda connector 6. When the expansion capsule 4 expands radially, it will contract axially. The expansion capsule 4 slides axially with the second inner pagoda connector 6 and the outer pagoda connector 7 to prevent tearing at the weak connection between the second inner pagoda connector 6, the outer pagoda connector 7 and the expansion capsule 4.

[0036] The inner wall of the outer pagoda connector 7 has two grooves, and a sealing ring 8 is installed in the groove. During the expansion capsule 4's expansion process, the sealing ring 8 plays the role of sealing the liquid.

[0037] The outer pagoda connector 7 has a water inlet hole inside, and the water inlet pipe 10 is welded to the water inlet hole. A valve 9 is installed on the first water inlet pipe 10, and the pressure of the water in the expansion capsule 4 is controlled by the valve 9.

[0038] The first inner pagoda connector 5 has a water inlet hole inside, and the water inlet pipe 11 is welded to the water inlet hole of the first inner pagoda connector 5. A valve 12 is installed on the second water inlet pipe 11, and the water inlet pipe 11 can be connected in series with the water inlet pipe of the next fixed hole device.

[0039] The two wheels of the solidified tube 1 have threads, and several solidified devices can be connected in series by threads according to the length of the solidified section to increase the solidified length and sealing effect.

[0040] Drilling should be carried out in accordance with the drilling design requirements and safety technical measures. The construction depth of the solidified hole section should be greater than or equal to the series length of the solidified hole pipe 1, the hole diameter should be greater than the outer diameter of the solidified hole device, and the hole wall should be as smooth as possible. Umbrella-shaped, step-shaped, or curved holes should not appear in the solidified hole section.

[0041] The solidified borehole section must be cleaned with compressed air or by washing the borehole to ensure that there is no coal slag or rock slag residue in the solidified borehole section. Coal slag or rock slag residue may damage the expansion capsule, causing the expansion capsule to break and leak water or the seal between the borehole wall and the capsule to be incomplete, which may lead to gas leakage during subsequent drilling operations.

[0042] Calculate the required number of hole-fixing devices based on the length of the hole-fixing section. Ensure that the valve at the innermost end of the innermost hole-fixing pipe 1 is closed and send it into the borehole. Connect the remaining hole-fixing devices end to end with the threads at both ends and connect the inlet and outlet of the hole-fixing devices end to end with a hose. Ensure that all these inlet and outlet ports are open. Finally, connect the last hole-fixing pipe 1 with the flange 2 and ensure that the flange is at the borehole opening.

[0043] Connect the water injection pump pipeline to the first water inlet pipe 10 or the second water inlet pipe 11 of the solid hole pipe 1, start the water injection pump, and the water enters the expansion capsule 4 through the water inlet pipeline and the hose connected end to end of the solid hole pipe 1. The expansion capsule 4 expands radially and fits tightly against the hole wall. Observe the water pressure gauge of the water injection pump. Generally, when the water pressure reaches 3 to 5 MPa, the water injection pump can be turned off and the outermost valve of the solid hole device can be closed to keep the capsule in a pressure-holding state.

[0044] Drilling continues as the drill string is lowered through the pore-fixing pipe 1. The pressure in the expansion capsule 4 is constantly monitored by the pressure gauge. If the pressure gauge shows a pressure less than 1.0 MPa, the water pump is connected to the outermost valve to perform pressure replenishment and maintain the pore-fixing pressure.

[0045] After the gas extraction borehole drilling operation is completed, the outermost valve is opened. Due to the contraction of the capsule, the liquid in the expansion capsule 4 flows back, the expansion capsule 4 is reset, the expansion pressure disappears, and the solidification tube 1 can be removed and disassembled from the gas extraction borehole.

[0046] By repeating the above steps, the solidified tube 1 can be reused.

[0047] Compared with related technologies, the rapid hole-fixing device for underground gas drainage boreholes provided by this utility model has the following beneficial effects:

[0048] This utility model provides a rapid hole-fixing device for underground gas drainage boreholes in coal mines. It is easy to install, economical, practical, highly applicable, and efficient, reducing the waiting time for hole fixing. By connecting several hole-fixing devices in series to adjust the length of the hole-fixing section and applying different expansion pressures to the expansion capsule 4, a tight hole-fixing of the drainage borehole is achieved, ensuring the construction and sealing effect of subsequent gas drainage boreholes. This device can adapt to the hole-fixing of gas drainage boreholes with different diameters, ensuring the effective sealing length and hole-fixing quality.

[0049] Second embodiment

[0050] Please refer to Figure 4 and Figure 5 Based on the first embodiment of this application, which provides a rapid hole-fixing device for underground gas drainage boreholes in coal mines, the second embodiment of this application proposes another rapid hole-fixing device for underground gas drainage boreholes in coal mines. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0051] Specifically, the second embodiment of this application provides a rapid hole-fixing device for underground gas extraction drilling in coal mines, wherein the expansion capsule 4 is provided with an installation component 13 at its end, the installation component 13 includes a threaded connecting seat 131, and the surface of the threaded connecting seat 131 is threadedly connected to a threaded connecting head 132.

[0052] The threaded connector 131 is connected to the end of the expansion capsule 4. A sealing ring is bonded to the inner wall of the through hole of the threaded connector 132. When the pipe 133 is installed inside the threaded connector 132, the sealing ring can be used to squeeze and seal.

[0053] A pipe 133 is installed between the threaded connector 131 and the threaded connector 132.

[0054] The working principle of the rapid hole-fixing device for underground gas drainage boreholes in coal mines provided by this utility model is as follows:

[0055] In use, first install the pipe 133 inside the threaded connector 132, then pass the pipe 133 through the inside of the threaded connector 131 and move it into the inside of the expansion capsule 4, while contacting one end of the threaded connector 132 with the threaded connector 131, and finally connect the threaded connector 132 and the threaded connector 131 by rotating the threaded connector 132.

[0056] Compared with related technologies, the rapid hole-fixing device for underground gas drainage boreholes provided by this utility model has the following beneficial effects:

[0057] This utility model provides a rapid hole-fixing device for underground gas extraction boreholes in coal mines. A threaded connecting seat 131, a threaded connecting head 132, and a pipe 133 are provided at the end of the expansion capsule 4, which can install and remove the pipe 133 from one end of the expansion capsule 4.

[0058] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A rapid hole-fixing device for underground gas drainage boreholes in coal mines, characterized in that, include: A solid hole tube, the surface of which is wrapped with an expansion capsule, the two ends of which are respectively connected to a first inner pagoda connector and a second inner pagoda connector, and an outer pagoda connector is provided between the solid hole tube and the second inner pagoda connector; A sealing ring is disposed inside the outer pagoda connector. One end of the outer pagoda connector and the first inner pagoda connector are respectively connected to a first water inlet pipe and a second water inlet pipe. A first valve and a second valve are respectively installed on the first water inlet pipe and the second water inlet pipe.

2. The rapid hole-fixing device for underground gas drainage boreholes in coal mines according to claim 1, characterized in that, One end of each of the fixed-hole tubes is connected to a flange, and the surface of the flange is provided with multiple bolt holes.

3. The rapid hole-fixing device for underground gas drainage boreholes in coal mines according to claim 1, characterized in that, The expansion capsule is made of highly elastic and wear-resistant rubber.

4. The rapid hole-fixing device for underground gas drainage boreholes in coal mines according to claim 1, characterized in that, The first inner pagoda connector and the second inner pagoda connector are used for sealing the expansion capsule.

5. The rapid hole-fixing device for underground gas drainage boreholes in coal mines according to claim 1, characterized in that, The sealing ring is used to seal the liquid inside the expansion capsule.

6. The rapid hole-fixing device for underground gas drainage boreholes in coal mines according to claim 1, characterized in that, The end of the expansion capsule is provided with an installation component, the installation component including a threaded connecting seat, and a threaded connecting head is threadedly connected to the surface of the threaded connecting seat.

7. The rapid hole-fixing device for underground gas drainage boreholes in coal mines according to claim 6, characterized in that, A pipe is installed between the threaded connector and the threaded connector head.

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