A gas extraction device for high-gas coal mines

Abstract

The present invention discloses a gas extraction device for high-gas coal mines, comprising: a drilling and extraction component, which can extract gas synchronously during the drilling process; a sealing component, which is arranged on a foundation and is used to seal the hole produced by the drilling of the drilling and extraction component; a first pipe body, one end of which is connected to the gas outlet end of the drilling and extraction component, and the other end is connected to a preset bin; and a second pipe body, one end of which is embedded in the sealing component, and the other end is connected to the preset bin, and the preset bin is also connected to the gas collecting bin by a third pipe body.

Description

Technical Field

[0001] The invention relates to the technical field of gas extraction, and in particular to a gas extraction device used in high-gas coal mines. Background Art

[0002] At present, gas extraction often involves first drilling along a predetermined route using drilling equipment, then taking out the drilling equipment, and then inserting an extraction pipe for extraction. Obviously, this type of extraction device and method is not conducive to gas extraction in high-gas coal mines. On the one hand, when drilling, the connection between the drilling equipment and the wellhead of the mine is not tight enough, which may cause leakage and overflow of coal mine gas. In addition, the amount of gas in high-gas coal mines is large, and this type of extraction device and method is not conducive to ensuring that the gas in high-gas coal mines can be continuously and stably extracted.

[0003] Therefore, it is necessary to provide a gas extraction device for high-gas coal mines to solve the above problems. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a gas extraction device for high-gas coal mines, comprising:

[0005] Drilling and extraction components, which can extract gas synchronously during drilling;

[0006] A sealing assembly is arranged on the foundation and is used to seal the orifice produced by the drilling and extraction assembly;

[0007] A first pipe body, one end of which is connected to the gas outlet of the drilling and extraction assembly, and the other end of which is connected to the preset chamber; and

[0008] One end of the second tube body is embedded in the sealing assembly, and the other end is connected to the pre-placement bin. The pre-placement bin is also connected to the gas collection bin by the third tube body.

[0009] Further, as a preference, the drilling and extraction assembly is configured to stop drilling after drilling a first spacing distance, and then perform static extraction until the extraction pressure drops to a first threshold value, and then perform the next drilling;

[0010] The first spacing is 5m to 10m;

[0011] The first threshold value is 30% to 50% of the initial static drainage pressure.

[0012] Further, as a preference, the sealing assembly is sealed and fixed on a casting layer, and the casting layer is a layer body formed by a cast-in-place sealing solution, below which are the comprehensive layer and the coal seam in sequence.

[0013] Further, as a preference, the drilling and extraction assembly comprises:

[0014] Drill pipe;

[0015] A drill bit, which is fixed to the end of the drill rod, and the drill bit is provided with a plurality of water outlet holes, and one end of the water outlet holes close to the drill rod is connected to the one-way filtering and plugging assembly; and

[0016] A sealing plate is sealed inside the drill pipe to separate the drill bit, and an extraction pipe is provided through the sealing plate. The top of the extraction pipe is connected to the first pipe body through a swivel joint, and one side of the extraction pipe is also connected to a water pipe.

[0017] Further, preferably, a support ring is provided on the outside of the drill rod for supporting drilling.

[0018] Further, as a preference, a first filter screen and a second filter screen are vertically installed in the pre-placed bin, the first filter screen corresponds to the first tube body, the second filter screen corresponds to the second tube body, at least two dust collection holes are also opened at the bottom of the pre-placed bin, one of the dust collection holes is located on the side of the first filter screen close to the first tube body, and the other dust collection hole is located on the side of the second filter screen close to the second tube body, and the bottom of the pre-placed bin is also connected to a collection bin;

[0019] The first tube body and the second tube body are both provided with valve bodies for alternate extraction.

[0020] Further, preferably, the sealing component comprises:

[0021] The sealing seat is a slot structure with the slot opening facing downward;

[0022] A ring chamber, which is embedded in the sealing seat and is coaxially arranged with the drilling and extraction assembly; and

[0023] A sealing guide ring is coaxially embedded in the ring compartment and is used to provide guidance for the drilling and extraction assembly.

[0024] Furthermore, preferably, a plurality of through holes are opened in the sealing guide ring, and the through holes are sealed with a sealing film. Air supply holes are opened at positions corresponding to the ring bin and the sealing film. The ring bin is also provided with an air control cylinder, and the air control cylinder can pump gas into the ring bin.

[0025] Further, as a preference, the one-way filtering and plugging assembly comprises:

[0026] A pipe body, one end of which is connected to the water outlet of the drill bit, and the other end of which is connected to a mounting seat, wherein the mounting seat is a chamber structure, and is arranged to be interlinked from top to bottom;

[0027] A third filter screen is fixed to the bottom of the mounting seat and is located inside the tube body;

[0028] One end of the first spring is fixed on the third filter screen, and the other end is connected with a one-way blocking mechanism.

[0029] Further, as a preference, the one-way blocking mechanism comprises:

[0030] A fourth filter screen, one end of which is connected to the first spring, and the other end of which is connected to a truncated cone groove, wherein the middle portion of the truncated cone groove is a through structure;

[0031] a fifth filter screen, which is fixed to an end of the truncated cone groove away from the fourth filter screen, and both ends of the fifth filter screen are sealing ring structures; and

[0032] The baffle is connected to the fifth filter screen by a second spring.

[0033] Compared with the prior art, the present invention provides a gas extraction device for high-gas coal mines, which has the following beneficial effects:

[0034] In the embodiment of the present invention, a sealing solution is cast on the integrated layer to form a sealed casting layer, and then a sealing assembly is arranged on the casting layer so that the sealing assembly can be used to collect gas in the hole during the drilling process of the drilling and extraction assembly, thereby preventing gas leakage from affecting the safety of surrounding construction.

[0035] In the embodiment of the present invention, the drilling and extraction component can be used to extract gas during the drilling process, thereby realizing comprehensive collection of gas. In addition, the drilling and extraction component is configured to stop drilling after drilling a first spacing distance, and then perform static extraction until the extraction pressure drops to a first threshold value, and then perform the next drilling. In this way, it can be ensured that the gas in high-gas coal mines can be continuously and stably extracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure is a schematic diagram of the overall structure of a gas extraction device used in a high-gas coal mine;

[0037] Figure 2 The present invention is a structural schematic diagram of a drilling and extraction component in a gas extraction device used in a high-gas coal mine;

[0038] Figure 3 The present invention is a schematic diagram of the structure of a sealing assembly in a gas extraction device used in a high-gas coal mine;

[0039] Figure 4 It is a structural schematic diagram of a one-way filtering and plugging component in a gas extraction device used in a high-gas coal mine;

[0040] In the figure: 1. coal seam; 2. comprehensive layer; 3. casting layer; 4. sealing assembly; 5. drilling and extraction assembly; 6. first pipe body; 7. preset bin; 8. first filter screen; 9. second pipe body; 10. second filter screen; 11. collecting bin; 12. third pipe body; 13. gas collecting bin; 41. sealing seat; 42. ring bin; 43. sealing guide ring; 44. sealing membrane; 45. air control cylinder; 51. drill rod; 52. drill bit; 53. sealing plate; 54. extraction pipe; 55. one-way filtering and plugging assembly; 56. swivel joint; 57. water pipe; 58. support ring; 551. pipe body; 552. third filter screen; 553. mounting seat; 554. first spring; 555. fourth filter screen; 556. truncated cone groove; 557. baffle; 558. second spring; 559. fifth filter screen. DETAILED DESCRIPTION

[0041] See also Figures 1 to 4 The present invention provides a gas extraction device for high-gas coal mines, comprising:

[0042] A drilling and extraction assembly 5, which can extract gas synchronously during the drilling process;

[0043] A sealing assembly 4, which is arranged on the foundation and used to seal the hole produced by the drilling and extraction assembly 5;

[0044] A first pipe body 6, one end of which is connected to the gas outlet end of the drilling and extraction assembly 5, and the other end of which is connected to the preset chamber 7; and

[0045] One end of the second tube body 9 is embedded in the sealing assembly 4 , and the other end is connected to the pre-placement chamber 7 . The pre-placement chamber 7 is also connected to the gas collection chamber 13 by the third tube body 12 .

[0046] In addition, the drilling and extraction component 5 is configured to stop drilling after drilling a first spacing distance, and then perform static extraction until the extraction pressure drops to a first threshold value, and then perform the next drilling;

[0047] The first spacing is 5m to 10m;

[0048] The first threshold value is 30% to 50% of the initial static drainage pressure.

[0049] In this embodiment, a sealing component 4 is arranged on the foundation so that the sealing component 4 can be used to collect gas in the hole during the drilling process of the drilling and extraction component 5, and the drilling and extraction component 5 itself can also extract gas during the drilling process, thereby realizing comprehensive collection of gas, thereby preventing gas leakage from affecting the safety of surrounding construction.

[0050] In addition, the drilling and extraction component 5 is configured to stop drilling after drilling a first spacing distance, and then perform static extraction until the extraction pressure drops to a first threshold value, and then perform the next drilling, so as to ensure that the gas can be continuously and stably extracted.

[0051] In order to improve the sealing performance of the sealing component 4, the sealing component 4 is sealed and fixed on the casting layer 3. The casting layer 3 is a layer body formed by a cast-in-place sealing solution, and below it are the comprehensive layer 2 and the coal seam 1 in sequence.

[0052] In this embodiment, Figure 2 , the drilling and extraction assembly 5 comprises:

[0053] Drill rod 51;

[0054] A drill bit 52, which is fixed to the end of the drill rod 51, and the drill bit 52 is provided with a plurality of water outlet holes, and one end of the water outlet holes close to the drill rod is connected to the one-way filtering plugging assembly 55; and

[0055] The sealing plate 53 seals the inside of the drill rod 51 and is used to separate the drill bit. A pumping tube 54 is provided through the sealing plate 53. The top of the pumping tube 54 is connected to the first tube body 6 via a swivel joint 56. One side of the pumping tube 54 is also connected to a water pipe 57.

[0056] As a preferred embodiment, the outer portion of the drill rod 51 is provided with a support ring 58 for supporting drilling.

[0057] The support ring 58 can improve the sealing performance between the drilling and extraction assembly 5 and the sealing assembly 4, and the support ring 58 can also be supported in the borehole, thereby achieving rigid support for the borehole and preventing the gas extraction borehole from collapsing under the action of radial load;

[0058] In this embodiment, a first filter screen 8 and a second filter screen 10 are vertically installed in the pre-set bin 7, the first filter screen 8 corresponds to the first tube body 6, the second filter screen 10 corresponds to the second tube body 9, and at least two dust collection holes are opened at the bottom of the pre-set bin 7, one of which is located on the side of the first filter screen close to the first tube body 6, and the other dust collection hole is located on the side of the second filter screen close to the second tube body, and the bottom of the pre-set bin 7 is also connected to a collection bin 11;

[0059] The first tube body 6 and the second tube body 9 are both provided with valve bodies for alternate extraction.

[0060] The first filter screen 8 can be used to filter the fluid in the first tube body 6; the second filter screen can be used to filter the fluid in the second tube body, and the two filtrations are performed alternately, which is conducive to backblowing the first filter screen and the second filter screen, thereby improving the filtration efficiency of the first filter screen and the second filter screen.

[0061] In this embodiment, Figure 3 , the sealing component 4 comprises:

[0062] The sealing seat 41 is a slot structure with the slot opening facing downward;

[0063] The ring chamber 42 is embedded in the sealing seat 41 and is coaxially arranged with the drilling and extraction assembly 5; and

[0064] The sealing guide ring 43 is coaxially embedded in the ring chamber 42 to provide guidance for the drilling and extraction assembly 5 .

[0065] In addition, a plurality of through holes are provided in the sealing guide ring 43, and the through holes are sealed with a sealing film 44. Air supply holes are provided at positions corresponding to the ring chamber 42 and the sealing film 44. An air control cylinder 45 is also provided on the ring chamber 42, and the air control cylinder 45 can pump gas into the ring chamber.

[0066] That is to say, in this embodiment, the sealing guide ring 43 can provide a drilling guide for the drilling and extraction component 5, and a plurality of through holes are opened in the sealing guide ring 43, and the through holes are sealed with a sealing film 44. In this way, when the drilling and extraction component 5 remains stationary, the sealing film can further improve the sealing effect.

[0067] In this embodiment, Figure 4 The one-way filtering and blocking component 55 comprises:

[0068] The tube body 551 has one end connected to the water outlet of the drill bit 52, and the other end connected to the mounting seat 53. The mounting seat 53 is a chamber structure, and is connected to each other from top to bottom.

[0069] The third filter screen 552 is fixed to the bottom of the mounting seat 53 and is located inside the tube body 551;

[0070] One end of the first spring 554 is fixed on the third filter screen 552 , and the other end is connected to a one-way blocking mechanism.

[0071] In addition, the one-way blocking mechanism includes:

[0072] A fourth filter screen 555, one end of which is connected to the first spring 554, and the other end of which is connected to a truncated cone groove 556, wherein the middle portion of the truncated cone groove 556 is a through structure;

[0073] a fifth filter screen 559, which is fixed to one end of the truncated cone groove 556 away from the fourth filter screen 555, and both ends of the fifth filter screen 559 are sealing ring structures; and

[0074] The baffle 557 is connected to the fifth filter screen 559 by a second spring 558 .

[0075] During implementation, when drilling is performed using the drilling extraction component 5, water can be injected into the extraction pipe 54 at intervals, and the water enters the mounting seat 553 through the extraction pipe 54, thereby pushing the entire one-way sealing mechanism to move through the baffle 557, so that the water passes through the mounting seat 553 and enters the pipe body 551 and is discharged from the drill bit, thereby achieving the discharge of annular debris and cooling of the drill bit; and when gas is extracted using the extraction pipe 54, the gas enters the pipe body 551 through the drill bit, and then pushes the baffle 557 after being filtered by the third filter screen 552 and the fourth filter screen 555, and then passes through the fifth filter screen 559 into the extraction pipe, thereby achieving one-way multi-layer filtration, preventing large pieces of debris from entering the extraction pipe and causing blockage of the extraction pipe.

[0076] In the specific implementation, a sealing solution is first cast on top of the integrated layer to form a sealed casting layer 3, and then a sealing component 4 is arranged on the casting layer 3, so that the sealing component 4 can be used to collect the gas in the hole during the drilling process of the drilling and extraction component 5, and the drilling and extraction component 5 itself can also extract gas during the drilling process, thereby realizing comprehensive collection of gas, thereby preventing gas leakage from affecting the safety of surrounding construction. In addition, the drilling and extraction component 5 is configured to stop drilling after drilling a first spacing distance, and then perform static extraction until the extraction pressure drops to a first threshold value, and then perform the next drilling, so as to ensure that the gas can be continuously and stably extracted.

[0077] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas extraction device for high-gas coal mines, characterized in that: include: A drilling and extraction assembly (5) capable of extracting gas synchronously during the drilling process; A sealing assembly (4) is arranged on the foundation and is used to seal the hole produced by the drilling and extraction assembly (5); A first tube body (6), one end of which is connected to the gas outlet end of the drilling and extraction assembly (5), and the other end of which is connected to the preset chamber (7); as well as A second tube body (9), one end of which is embedded in the sealing assembly (4), and the other end of which is connected to the pre-placement chamber (7); the pre-placement chamber (7) is also connected to the gas collection chamber (13) by means of a third tube body (12); The drilling and extraction assembly (5) comprises: Drill rod (51); a drill bit (52) fixed to the end of the drill rod (51), and the drill bit (52) is provided with a plurality of water outlet holes, wherein one end of the water outlet holes close to the drill rod is connected to a one-way filtering plugging assembly (55); and A sealing plate (53) is sealed inside the drill rod (51) and is used to separate the drill bit. A pumping tube (54) is provided through the sealing plate (53). The top of the pumping tube (54) is connected to the first tube body (6) via a swivel joint (56). One side of the pumping tube (54) is also connected to a water pipe (57); A first filter screen (8) and a second filter screen (10) are vertically installed in the pre-set bin (7), the first filter screen (8) corresponds to the first tube body (6), the second filter screen (10) corresponds to the second tube body (9), two dust collection holes are also provided at the bottom of the pre-set bin (7), one of the dust collection holes is located on a side of the first filter screen close to the first tube body (6), and the other dust collection hole is located on a side of the second filter screen close to the second tube body, and the bottom of the pre-set bin (7) is also connected to a collection bin (11); The first tube body (6) and the second tube body (9) are both provided with valve bodies for alternate extraction; The one-way filtering and plugging component (55) comprises: A tube body (551), one end of which is connected to the water outlet of the drill bit (52), and the other end of which is connected to a mounting seat (53), wherein the mounting seat (53) is a chamber structure and is arranged to be interlinked from top to bottom; A third filter screen (552) fixed to the bottom of the mounting seat (53) and located inside the tube body (551); A first spring (554), one end of which is fixed to the third filter screen (552), and the other end of which is connected to a one-way blocking mechanism; The one-way blocking mechanism comprises: A fourth filter screen (555), one end of which is connected to the first spring (554), and the other end of which is connected to a truncated cone groove (556), wherein the middle portion of the truncated cone groove (556) is a through structure; a fifth filter screen (559), which is fixed to an end of the truncated cone groove (556) away from the fourth filter screen (555), and both ends of the fifth filter screen (559) are sealing ring structures; and The baffle (557) is connected to the fifth filter screen (559) by a second spring (558).

2. A gas extraction device for high-gas coal mines according to claim 1, characterized in that: The drilling and extraction component (5) is configured to stop drilling after drilling a first spacing distance, and then perform static extraction until the extraction pressure drops to a first threshold value, and then perform the next drilling; The first spacing is 5m to 10m; The first threshold value is 30% to 50% of the initial static drainage pressure.

3. A gas extraction device for high-gas coal mines according to claim 1, characterized in that: The sealing component (4) is sealed and fixed on the casting layer (3), and the casting layer (3) is a layer body formed by a cast-in-place sealing solution, and below it are the comprehensive layer (2) and the coal seam (1) in sequence.

4. A gas extraction device for high-gas coal mines according to claim 1, characterized in that: The outer portion of the drill rod (51) is provided with a support ring (58) for supporting drilling.

5. A gas extraction device for high-gas coal mines according to claim 1, characterized in that: The sealing component (4) comprises: The sealing seat (41) is a slot structure with the slot opening facing downward; A ring chamber (42), which is embedded in the sealing seat (41) and is coaxially arranged with the drilling and extraction assembly (5); and A sealing guide ring (43) is coaxially embedded in the ring chamber (42) and is used to provide guidance for the drilling and extraction assembly (5).

6. A gas extraction device for high-gas coal mines according to claim 5, characterized in that: The sealing guide ring (43) is provided with a plurality of through holes, and the through holes are sealed with a sealing film (44). The ring chamber (42) is provided with air supply holes at positions corresponding to the sealing film (44). The ring chamber (42) is also provided with an air control cylinder (45), and the air control cylinder (45) is capable of pumping gas into the ring chamber.

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