Infiltration device and extraction system

Abstract

The present invention provides a permeability enhancement device and an extraction system, which relate to the field of coal mine gas extraction. The permeability enhancement device includes a heating furnace, a heating pipe and a screen pipe. The screen pipe can be set in the extraction borehole of the coal seam, and the heating pipe is set in the screen pipe. Both ends of the heating pipe extend out of the screen pipe and the extraction borehole and are connected to the heating furnace. When the permeability enhancement device is in use, the screen pipe is set in the extraction borehole, and the heating pipe is set in the screen pipe. There is no need to drill a special heating borehole, which greatly reduces the drilling workload of the traditional heating permeability enhancement method and also avoids the collapse accident caused by the increase in the number of boreholes. In addition, the screen pipe forms a protection for the heating pipe and also plays a supporting and protective role for the extraction borehole. That is, the permeability enhancement device takes into account heating permeability enhancement and screen pipe hole protection at the same time, realizing the integration of heating permeability enhancement and hole protection to promote extraction. It has a simple structure, is not easy to cause hole collapse, and can protect the hole. It is particularly suitable for soft coal seams in high-gas and protruding mines.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine gas extraction, and in particular to a permeability enhancement device and an extraction system. Background Art

[0002] As much as 82% of my country's coal mining areas are soft, low-permeability coal seams. These seams are characterized by fractured coal, low permeability, and high gas content. Gas extraction is the primary method for addressing gas problems in my country's high-gas and outburst mines. However, the low permeability of soft, low-permeability coal seams makes conventional extraction methods ineffective.

[0003] Because increasing the temperature of coal seams can increase the kinetic energy of methane molecules adsorbed within them, facilitating gas desorption and improving extraction efficiency, existing technologies have developed permeability enhancement devices that heat coal seams to increase their permeability. However, these existing devices require the drilling of specialized heating boreholes, which increases the amount of drilling work and, with the increasing number of boreholes, increases the risk of borehole collapse. Summary of the Invention

[0004] The first purpose of the present invention is to provide a permeation enhancement device to solve the technical problems in the prior art that the permeation enhancement device needs to set up special heating boreholes, the drilling workload increases, and as the number of boreholes increases, the boreholes are prone to collapse.

[0005] The permeability enhancement device provided by the present invention includes a heating furnace, a heating pipe and a screen pipe. The screen pipe can be set in the extraction borehole of the coal seam, and the heating pipe is set in the screen pipe. Both ends of the heating pipe extend outside the screen pipe and the extraction borehole and are connected to the heating furnace.

[0006] Furthermore, the permeability enhancement device further includes a tee pipe having a first pipe section, a second pipe section, and a third pipe section, wherein the first pipe section extends into the extraction borehole, and an outer side wall of the first pipe section is sealed against a wall of the extraction borehole, and an outer end of the screen tube is connected to the first pipe section;

[0007] The second pipe section is provided with an end cap at its mouth, and the end cap is provided with two through holes respectively matching the two ends of the heating pipe, and the two ends of the heating pipe respectively pass through the corresponding through holes;

[0008] The third pipe section is connected to the extraction pipeline.

[0009] Furthermore, the first pipe section and the second pipe section are coaxially arranged, and the third pipe section is arranged at an angle to the first pipe section and the second pipe section.

[0010] Furthermore, the input end and the output end of the heating pipe are respectively connected to a heat supply pipeline and a heat return pipeline, and are connected to the heating furnace through the heat supply pipeline and the heat return pipeline.

[0011] Furthermore, the heat supply pipeline includes a heat supply main pipe and a plurality of heat supply branch pipes, the heat supply main pipe is connected to the heating furnace, the plurality of heat supply branch pipes are respectively connected to the heat supply main pipe, and the input end of the heating pipe is connected to one of the heat supply branch pipes;

[0012] The heat recovery pipeline includes a heat recovery main pipe and multiple heat recovery branch pipes. The heat recovery main pipe is connected to the heating furnace. The multiple heat recovery branch pipes are respectively connected to the heat recovery main pipe. The output end of the heating pipe is connected to one of the heat recovery branch pipes.

[0013] Furthermore, the heat supply branch pipe is provided with a first stop valve, and the first stop valve is used to control the on and off of the heat supply branch pipe;

[0014] And / or, the heat recovery branch pipe is provided with a second stop valve, and the second stop valve is used to control the opening and closing of the heat recovery branch pipe.

[0015] Furthermore, a detection pipe section is provided beside the third pipe section, and a gas detection device is installed at the pipe mouth of the detection pipe section away from the third pipe section. The gas detection device is used to detect the components of the gas in the third pipe section and the content of each component.

[0016] Furthermore, the gas detection device is connected to the first stop valve and the second stop valve. When the detection result of the gas detection device exceeds a preset range, the gas detection device controls the corresponding branch to be disconnected.

[0017] Furthermore, the permeation enhancement device further includes a temperature sensor and a pressure sensor. The temperature sensor is used to monitor the temperature of the heating medium in the heating furnace, and the pressure sensor is used to monitor the pressure of the heating medium.

[0018] The permeation enhancement device provided by the present invention can produce the following beneficial effects:

[0019] The permeability enhancement device provided by the present invention, when in use, heats the heating medium in the heating furnace, and then transports the heating medium to the extraction borehole of the coal seam through the heating pipe to heat the coal seam to increase the permeability of gas in the coal seam and promote gas extraction.

[0020] The permeability enhancement device provided by the present invention includes a screen pipe. When in use, the screen pipe is arranged in the extraction borehole, and the heating pipe is arranged in the screen pipe. There is no need to drill a special heating borehole, which greatly reduces the drilling workload of the traditional heating permeability enhancement method and also avoids the collapse accident caused by the increase in the number of boreholes. In addition, the screen pipe forms a protection for the heating pipe and also plays a supporting and protective role for the extraction borehole. That is, the permeability enhancement device of the present invention takes into account both heating permeability enhancement and screen pipe hole protection, realizing the integration of heating permeability enhancement and hole protection to promote extraction. It has a simple structure, is not prone to hole collapse, and can protect the hole. It is particularly suitable for soft coal seams in high-gas and protruding mines, can effectively improve the permeability of gas in the coal seam, and greatly shortens the time to reach the extraction standard.

[0021] The second purpose of the present invention is to provide an extraction system to solve the technical problems in the prior art that the infiltration device needs to be drilled with a special heating borehole, the drilling workload increases, and as the number of boreholes increases, the borehole collapse is prone to occur.

[0022] The extraction system provided by the present invention includes the aforementioned permeation enhancement device. The extraction system has all the advantages of the aforementioned permeation enhancement device, so they are not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the partial structure of the extraction system provided in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 100 - heating furnace; 110 - heat supply main pipe; 120 - heat supply branch pipe; 121 - first stop valve; 130 - heating pipe; 140 - heat recovery branch pipe; 141 - second stop valve; 150 - heat recovery main pipe; 160 - circulating pump; 170 - temperature sensor; 180 - pressure sensor;

[0027] 200-sieve tube;

[0028] 310- extraction pipeline; 320- grid connection pipe; 330- third stop valve;

[0029] 410 - first pipe section; 420 - second pipe section; 421 - end cap; 430 - third pipe section;

[0030] 510- detection pipe section; 520- fourth stop valve;

[0031] 600-sealing tube; 610-sealing body;

[0032] 700-coal seam; 710-extraction drilling hole. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] This embodiment provides a permeation enhancement device, such as Figure 1 As shown, the permeability enhancement device includes a heating furnace 100, a heating pipe 130 and a screen pipe 200. The screen pipe 200 can be set in the extraction borehole 710 of the coal seam 700 and can extend to the bottom of the extraction borehole 710. The heating pipe 130 is set in the screen pipe 200, and both ends of the heating pipe 130 extend out of the screen pipe 200 and the extraction borehole 710 and are connected to the heating furnace 100.

[0035] When the permeability enhancement device provided in this embodiment is used, after the heating furnace 100 heats the heating medium, the heating medium is transported to the extraction borehole 710 of the coal seam 700 through the heating pipe 130 to heat the coal seam 700 to increase the permeability of gas in the coal seam 700 and promote gas extraction.

[0036] The permeability enhancement device provided in this embodiment includes a screen pipe 200. When in use, the screen pipe 200 is set in the extraction borehole 710, and the heating pipe 130 is set in the screen pipe 200. There is no need to drill a special heating borehole, which greatly reduces the drilling workload of the traditional heating permeability enhancement method and avoids the collapse accident caused by the increase in the number of boreholes. In addition, the screen pipe 200 forms a protection for the heating pipe 130 and also plays a supporting and protective role for the extraction borehole 710. That is, the permeability enhancement device of this embodiment takes into account the heating permeability enhancement and the hole protection of the screen pipe 200 at the same time, realizing the integration of heating permeability enhancement and hole protection to promote extraction. It has a simple structure, is not prone to hole collapse, and can protect the hole. It is especially suitable for soft coal seams in high-gas and protruding mines. It can effectively improve the permeability of gas in the coal seam 700 and greatly shorten the time to meet the extraction standard.

[0037] Specifically, the supporting and protective effect of the screen pipe 200 on the heating pipe 130 is as follows: when the diameter of the screen pipe 200 matches the aperture of the extraction borehole 710, the screen pipe 200 supports the extraction borehole 710 and can avoid hole collapse; and when the diameter of the screen pipe 200 is smaller than the aperture of the extraction borehole 710, if hole collapse occurs, the screen pipe 200 can also play a supporting role, thereby greatly reducing the adverse effects on extraction and ensuring the normal and stable extraction.

[0038] Preferably, in this embodiment, Figure 1 As shown, the screen pipe 200 and the heating pipe 130 are both laid to the bottom of the extraction borehole 710. Such an arrangement can ensure the heating and permeability-enhancing effect on the coal seam 700 along the entire length of the extraction borehole 710.

[0039] Specifically, in this embodiment, continue as Figure 1 As shown, the heating pipe 130 is arranged in a U-shape within the screen pipe 200. Of course, in other embodiments of the present application, the arrangement of the heating pipe 130 within the screen pipe 200 is not limited to the U-shape. For example, the heating pipe 130 extends in a spiral shape with the axis of the screen pipe 200 as the axis to the bottom of the extraction borehole 710, and then returns in a straight line along the axis of the screen pipe 200. In this arrangement, the heating medium stays in the extraction borehole 710 for a long time, which can better perform heat exchange, and the low-temperature heating medium after heat exchange can also be quickly returned to the heating furnace 100.

[0040] Specifically, in this embodiment, the screen pipe 200 can adopt a multi-section plug-in structure; the heating pipe 130 can adopt a multi-section plug-in structure or be made of a flexible material. This arrangement facilitates the installation of the screen pipe 200 and the heating pipe 130 in the underground coal mine tunnel.

[0041] Specifically, in this application, Figure 1 As shown, the permeation enhancement device also includes a tee pipe having a first pipe section 410, a second pipe section 420, and a third pipe section 430. The first pipe section 410 extends into the extraction borehole 710, and the outer wall of the first pipe section 410 is sealed with the wall of the extraction borehole 710. The outer end of the screen tube 200 is connected to the first pipe section 410; the pipe mouth of the second pipe section 420 is provided with an end cap 421, which has two through-holes that match the two ends of the heating pipe 130, and the two ends of the heating pipe 130 pass through the corresponding through-holes; the third pipe section 430 is connected to the extraction pipeline 310. With this arrangement, the tee pipe integrates the functions of the gas channel and the heating pipe 130 channel, with a high degree of functional integration and a simple and reliable structure.

[0042] Specifically, in this embodiment, the permeation enhancement device further includes a sealing tube 600, the outer wall of the sealing tube 600 and the hole wall of the extraction borehole 710 are sealed by a sealing material, and the sealing material forms a sealing body 610 after solidification; the first pipe section 410 is sealedly connected to the outer end of the sealing tube 600; and the outer end of the screen tube 200 is inserted into the sealing tube 600. With this arrangement, it is relatively convenient to install the sealing tube 600 in the extraction borehole 710 and to install the tee pipe in the sealing tube 600. Of course, in other embodiments of the present application, the sealing tube 600 may not be provided, and the first pipe section 410 may be directly and sealedly installed in the extraction borehole 710.

[0043] It should be noted that in other embodiments of the present application, the outer end of the screen pipe 200 may also be sleeved onto the outside of the sealing pipe 600, or connected to the sealing pipe 600 via a flange structure. In other words, as long as the connection between the screen pipe 200 and the sealing pipe 600 ensures protection of the heating pipe 130 and the extraction borehole 710, the present application does not limit the specific connection method between the screen pipe 200 and the sealing pipe 600.

[0044] Specifically, in this embodiment, continue as Figure 1 As shown, the third pipe section 430 can be connected to the extraction pipeline 310 through the grid-connected pipe 320 , thereby achieving the extraction of gas in the extraction borehole 710 .

[0045] Specifically, in this embodiment, the first pipe section 410 and the second pipe section 420 are coaxially arranged, and the third pipe section 430 is arranged at an angle thereto. Preferably, the third pipe section 430 is arranged perpendicular to the first and second pipe sections 410 and 420. During use, the first and second pipe sections 410 and 420 are arranged horizontally to facilitate pipeline laying, while the third pipe section 430 is arranged vertically to facilitate upward gas flow.

[0046] Specifically, in this embodiment, the input end and the output end of the heating pipe 130 are respectively connected to the heat supply pipe and the heat return pipe, and are connected to the heating furnace 100 through the heat supply pipe and the heat return pipe.

[0047] More specifically, in this embodiment, the heat supply pipeline includes a heat supply main pipe 110 and multiple heat supply branch pipes 120. The heat supply main pipe 110 is connected to the heating furnace 100, and the multiple heat supply branch pipes 120 are respectively connected to the heat supply main pipe 110. The input end of the heating pipe 130 is connected to one of the heat supply branch pipes 120. The heat return pipeline includes a heat return main pipe 150 and multiple heat return branch pipes 140. The heat return main pipe 150 is connected to the heating furnace 100, and the multiple heat return branch pipes 140 are respectively connected to the heat return main pipe 150. The output end of the heating pipe 130 is connected to one of the heat return branch pipes 140. Under this setting, multiple extraction boreholes 710 in the same area can be connected to the heat supply main pipe 110 through a heat supply branch pipe 120, and connected to the heat recovery main pipe 150 through a heat recovery branch pipe 140. That is, one heating furnace 100 can heat multiple extraction boreholes 710 at the same time, thereby further increasing the permeability of gas in the coal seam 700 and promoting the extraction of gas in the coal seam 700.

[0048] Specifically, in this embodiment, Figure 1As shown, the heat supply branch pipe 120 is provided with a first stop valve 121 for controlling the on / off operation of the heat supply branch pipe 120; the heat recovery branch pipe 140 is provided with a second stop valve 141 for controlling the on / off operation of the heat recovery branch pipe 140. In this configuration, when the first stop valve 121 and the second stop valve 141 are closed simultaneously, repair and replacement of the heat supply branch pipe 120, the heating pipe 130, and the heat recovery branch pipe 140 between them can be facilitated. When the first stop valves 121 on all heat supply branch pipes 120 and the second stop valves 141 on all heat recovery branch pipes 140 are closed, repair and replacement of the heating furnace 100, the heat supply main pipe 110, and the heat recovery main pipe 150 can be facilitated.

[0049] It should be noted that, in other embodiments of the present application, only one of the first stop valve 121 and the second stop valve 141 may be provided, so as to realize the opening and closing of a pipeline.

[0050] Specifically, in this embodiment, a circulation pump 160 is further provided on the heat recovery main pipe 150 . The circulation pump 160 can adjust the circulation speed of the heating medium, thereby improving the heating efficiency of the coal seam 700 .

[0051] It should be noted that, in other embodiments of the present application, the circulation pump 160 may also be provided on the heat delivery main pipe 110 .

[0052] Specifically, in this embodiment, Figure 1 As shown, a detection pipe section 510 is installed next to the third pipe section 430. A gas detection device is installed at the end of the detection pipe section 510 away from the third pipe section 430. The gas detection device is used to detect the composition and content of the gas within the third pipe section 430. In this configuration, the third pipe section 430 facilitates the installation of the gas detection device, which in turn facilitates the detection of dangerous situations and the implementation of timely measures to prevent accidents.

[0053] Preferably, the gas detection device may be a real-time detection device, thereby enabling real-time and continuous monitoring, thereby facilitating timely detection of dangerous situations.

[0054] It should be noted that, in other embodiments of the present application, a detection hole may be directly provided in the third pipe section 430 , and the gas detection device may be directly installed at the detection hole.

[0055] Specifically, in this embodiment, the gas detection device can be connected to the first shut-off valve 121 and the second shut-off valve 141. When the gas detection device's detection results exceed a preset range, the gas detection device controls the corresponding branch circuit to disconnect. The "preset range" can be a specified safe value range, such as a safe methane concentration range. This arrangement achieves intelligent linkage between the gas detection device and the first and second shut-off valves 121, 141, providing a more rapid and timely response than manual operation.

[0056] Preferably, the gas detection device can also generate an alarm while disconnecting the first stop valve 121 and the second stop valve 141 to stop heating the coal seam 700 .

[0057] It should be noted that the connection between the gas detection device and the first stop valve 121 and the second stop valve 141 and how to implement the alarm are mature existing technologies. This application does not make any improvements, so this application will not elaborate on them.

[0058] Specifically, in this embodiment, a third stop valve 330 may be provided on the grid connection pipe 320 to control the on and off of the grid connection pipe 320 .

[0059] Specifically, in this embodiment, a fourth stop valve 520 is provided on the detection pipe section 510 to control the on and off of the detection pipe section 510 .

[0060] Specifically, in this embodiment, Figure 1 As shown, the permeation device further includes a temperature sensor 170 and a pressure sensor 180 . The temperature sensor 170 is used to monitor the temperature of the heating medium in the heating furnace 100 , and the pressure sensor 180 is used to monitor the pressure of the heating medium.

[0061] Specifically, in this embodiment, the heating medium can be water, oil or steam. Compared with using electric heating, the heating medium used in this embodiment can avoid the dangerous situation of gas combustion or explosion caused by short circuit, and is safer.

[0062] This embodiment further provides a drainage system including the above-mentioned permeation enhancement device. This drainage system has all the advantages of the above-mentioned permeation enhancement device, so they are not described in detail here.

[0063] Finally, it should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0064] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A permeation enhancement device, characterized in that: The invention comprises a heating furnace (100), a heating pipe (130) and a screen pipe (200), wherein the screen pipe (200) can be arranged in a drainage borehole (710) of a coal seam (700), the heating pipe (130) is arranged in the screen pipe (200), and both ends of the heating pipe (130) extend outside the screen pipe (200) and the drainage borehole (710) and are connected to the heating furnace (100); The permeability enhancement device further comprises a tee pipe, the tee pipe comprising a first pipe section (410), a second pipe section (420) and a third pipe section (430), the first pipe section (410) extending into the extraction borehole (710), and the outer wall of the first pipe section (410) being sealed against the wall of the extraction borehole (710), and the outer end of the screen tube (200) being connected to the first pipe section (410); The mouth of the second pipe section (420) is provided with an end cover (421), and the end cover (421) is provided with two through holes respectively matching the two ends of the heating pipe (130), and the two ends of the heating pipe (130) respectively pass through the corresponding through holes; The third pipe section (430) is in communication with the extraction pipeline (310); The first pipe section (410) and the second pipe section (420) are coaxially arranged, and the third pipe section (430) is arranged at an angle to the first pipe section (410) and the second pipe section (420); The input end and the output end of the heating pipe (130) are respectively connected to a heat supply pipe and a heat return pipe, and are connected to the heating furnace (100) through the heat supply pipe and the heat return pipe; The permeation enhancement device further comprises a temperature sensor (170) and a pressure sensor (180), wherein the temperature sensor (170) is used to monitor the temperature of the heating medium in the heating furnace (100), and the pressure sensor (180) is used to monitor the pressure of the heating medium.

2. The permeation enhancement device according to claim 1, characterized in that The heat delivery pipeline comprises a heat delivery main pipe (110) and a plurality of heat delivery branch pipes (120), the heat delivery main pipe (110) is connected to the heating furnace (100), the plurality of heat delivery branch pipes (120) are respectively connected to the heat delivery main pipe (110), and the input end of the heating pipe (130) is connected to one of the heat delivery branch pipes (120); The heat recovery pipeline comprises a heat recovery main pipe (150) and a plurality of heat recovery branch pipes (140); the heat recovery main pipe (150) is connected to the heating furnace (100); the plurality of heat recovery branch pipes (140) are respectively connected to the heat recovery main pipe (150); and the output end of the heating pipe (130) is connected to one of the heat recovery branch pipes (140).

3. The permeation enhancement device according to claim 2, characterized in that: The heat supply branch pipe (120) is provided with a first stop valve (121), and the first stop valve (121) is used to control the on and off of the heat supply branch pipe (120); And / or, the heat recovery branch pipe (140) is provided with a second stop valve (141), and the second stop valve (141) is used to control the on and off of the heat recovery branch pipe (140).

4. The permeation enhancement device according to claim 3, characterized in that A detection pipe section (510) is provided beside the third pipe section (430), and a gas detection device is installed at the pipe mouth of the detection pipe section (510) away from the third pipe section (430). The gas detection device is used to detect the components of the gas in the third pipe section (430) and the content of each component.

5. The permeation enhancement device according to claim 4, characterized in that: The gas detection device is connected to the first stop valve (121) and the second stop valve (141). When the detection result of the gas detection device exceeds a preset range, the gas detection device controls the corresponding branch to be disconnected.

6. A drainage system, characterized in that: The invention comprises the permeation enhancing device according to any one of claims 1 to 5.

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