A gas drilling air leakage monitoring device with multiple independent monitoring spaces

Abstract

This invention discloses a gas borehole leakage monitoring device with multiple independent monitoring spaces, specifically relating to the field of gas extraction technology. The gas borehole leakage monitoring device with multiple independent monitoring spaces includes: an extraction pipe connected to a gas extraction pipe and a gas detector assembly. The extraction pipe is internally divided into multiple sections: a distal section, at least one intermediate section, a proximal section, and a transition section. The intermediate section is located between the distal and proximal sections. The distal and intermediate sections are respectively provided with independent first and second exhaust channels. Both the first and second exhaust channels pass through the proximal section, and the first exhaust channel also passes through the intermediate section. The gas borehole leakage monitoring device with multiple independent monitoring spaces provided by this invention enables independent collection and detection of gas in different depth areas of the borehole, accurately locating leakage segments for precise subsequent leak sealing.

Description

Technical Field

[0001] This invention relates to the field of gas extraction technology, and in particular to a gas borehole leakage monitoring device with multiple independent monitoring spaces. Background Technology

[0002] During coal mining, methane gas is a safety hazard. Methane gas generally accumulates in the fissures of the coal seam. During mining, the fissures gradually enlarge due to the influence of ground pressure, causing free methane gas in the fissures to flow through the fissure channels into the roadways or mining faces, posing a great threat to safe production. Therefore, methane drainage is of paramount importance in coal mining.

[0003] Currently, gas drainage mainly involves pre-drilling multiple boreholes in the coal seam and inserting drainage pipes into them. (During insertion, the area around the borehole opening must be sealed to prevent air leakage from the roadway into the drainage pipes, thus reducing gas drainage efficiency.) These drainage pipes are connected to a main gas drainage pipe, which in turn connects to an underground gas pumping station. The pumping station then pumps the drained gas to the surface for treatment. During actual drainage, the continuous advancement of the coal face causes constant changes in ground pressure. Under this fluctuating pressure, the coal seam fissures around the gas boreholes gradually enlarge, allowing air from the roadway to enter the drainage pipes. To detect this problem promptly, real-time monitoring of the gas content in the drainage pipes is necessary for timely detection and intervention. However, traditional gas monitoring devices typically only detect the overall gas concentration of the borehole and cannot accurately pinpoint the leak location, leading to inefficient subsequent plugging measures.

[0004] Therefore, it is necessary to provide a gas borehole leakage monitoring device with multiple independent monitoring spaces to solve the above-mentioned technical problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a gas borehole leakage monitoring device with multiple independent monitoring spaces to facilitate accurate location of gas leaks.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A gas borehole leakage monitoring device with multiple independent monitoring spaces includes: an extraction pipe connected to a gas extraction pipe and a gas detector assembly. The extraction pipe is internally divided into multiple sections, namely a distal section, at least one intermediate section, a proximal section, and a transition section. The intermediate section is located between the distal section and the proximal section. The distal section and the intermediate section are respectively provided with independent first exhaust channels and second exhaust channels. Both the first exhaust channel and the second exhaust channel pass through the proximal section, and the first exhaust channel also passes through the intermediate section. A third exhaust channel is provided on the proximal section. The gas extracted from the first exhaust channel, the second exhaust channel, and the third exhaust channel all converge into the transition section and enter the main gas extraction pipe. The gas detector assembly includes a protective box, and a gas detector is installed inside the protective box. An air extraction valve assembly is installed on the transition section and on each first exhaust channel, each second exhaust channel, and each third exhaust channel. An air inlet pipe and an air outlet pipe are installed on the protective box. The air outlet pipe is connected to the main gas extraction pipe, and the air inlet pipe is connected to the air extraction valve assembly.

[0008] The gas extraction valve assembly includes a fixed block that is fixedly installed on the gas extraction pipe. The fixed block has a cylindrical groove, a first conical groove, and a second conical groove inside. The cylindrical groove is located above and connected to the first conical groove. The cone angles of the first and second conical grooves both point upwards. The fixed block also has a movable rod inside. The movable rod consists of a first conical rod located above and a second conical rod located below, which are fixed together as a whole. The first conical rod is located in the cylindrical groove and the second conical groove, and the second conical rod is located in the first conical groove. Both the first and second conical rods are covered with a silicone layer. The silicone layer achieves a seal between the first conical rod and the second conical groove, and between the second conical rod and the first conical groove, ultimately forming a double seal to prevent gas in the extraction pipe from escaping through the gas extraction valve assembly. A spring is fixedly installed at the top of the cylindrical groove, and the bottom end of the spring is fixed to the top of the second conical rod.

[0009] Preferably, a connector is rotatably mounted on the intake pipe. The connector includes a cap with an internal thread. A thread is provided on the outside of the fixing block. The cap and the fixing block can be threadedly connected. A top rod is fixedly mounted on the cap. The top rod is adapted to a limiting groove with the top of the first conical rod. An exhaust hole is provided on the top of the cap.

[0010] Preferably, a retaining ring is fixed inside the cap, and a sealing gasket is fixed at the bottom of the retaining ring.

[0011] Preferably, a filter screen is fixedly installed at the bottom of the fixing block, and the filter screen is used to filter particulate impurities in the gas.

[0012] Preferably, the air extraction valve assembly is further threaded with a sealing cap.

[0013] Preferably, multiple baffles are fixedly installed inside the extraction pipe. The first exhaust channel is composed of a baffle and a first arc-shaped plate. One end of the first arc-shaped plate is fixed to the baffle, and both sides of the first arc-shaped plate are fixed to the inner wall of the extraction pipe. The second exhaust channel is composed of a baffle and a second arc-shaped plate. One end of the second arc-shaped plate is fixed to the baffle, and both sides of the second arc-shaped plate are fixed to the inner wall of the extraction pipe. The third exhaust channel is composed of a baffle and a third arc-shaped plate. One end of the third arc-shaped plate is fixed to the baffle, and both sides of the third arc-shaped plate are fixed to the inner wall of the extraction pipe. Multiple suction holes are provided on the extraction pipe. Suction holes are distributed in the distal section, the middle section, and the proximal section, except for the first and second exhaust channels.

[0014] Preferably, there are multiple third exhaust channels, which are arranged in a ring shape, and each third exhaust channel is installed with an air extraction valve assembly.

[0015] Preferably, the transition section has a mixing hole inside, which is a hole with a larger diameter at both ends and a smaller diameter in the middle.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) This invention divides the extraction pipe into a distal section, a middle section, a proximal section and a transition section, and sets up independent first exhaust channels, second exhaust channels and third exhaust channels to achieve independent collection and detection of gas in different depth areas of the borehole, accurately locate the leakage section, so as to accurately plug the leak in the later stage.

[0018] (2) The present invention requires only a single gas detector component, and multiple gas segments can be detected by switching the gas extraction valve component, which greatly reduces equipment cost and maintenance complexity;

[0019] (3) The present invention achieves gas mixing through a venturi tube mixing hole, which facilitates the gas detector assembly to detect the overall gas content;

[0020] (4) The present invention has multiple third exhaust channels and corresponding air extraction valve components arranged in a ring at the near end section, which can identify the general direction of air leakage and provide spatial positioning basis for grouting and sealing. It is especially suitable for fine investigation of high air leakage risk areas at the borehole port. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of the gas borehole leakage monitoring device with multiple independent monitoring spaces provided by the present invention;

[0022] Figure 2This is a cross-sectional view of the extraction and drainage pipe.

[0023] Figure 3 This is a cross-sectional view of the extraction and discharge pipe from another perspective.

[0024] Figure 4 This is an assembly diagram of the partition, the first arc-shaped plate, the second arc-shaped plate, and the third arc-shaped plate;

[0025] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure of section A in the middle;

[0026] Figure 6 for Figure 4 A schematic diagram of the exploded structure;

[0027] Figure 7 This is a schematic diagram of the assembly of the fixing block and the sealing cap;

[0028] Figure 8 This is a cross-sectional structural diagram of the gas detector assembly.

[0029] The corresponding names of the reference numerals in the attached drawings are as follows: 1. Extraction pipe; 2. Distal section; 3. Middle section; 4. Proximal section; 5. Transition section; 6. Partition plate; 7. First arc-shaped plate; 8. First exhaust channel; 9. Second arc-shaped plate; 10. Second exhaust channel; 11. Third arc-shaped plate; 12. Third exhaust channel; 13. Suction hole; 14. Extraction valve assembly; 15. Protective box; 16. Gas detector; 17. Fixing block; 18. Cylindrical groove; 19. First conical groove; 20. First conical rod; 21. Second conical rod; 22. Second conical groove; 23. Spring; 24. Limiting groove; 25. Cap; 26. Top rod; 27. Exhaust hole; 28. Retaining ring; 29. ​​Filter screen; 30. Sealing cap; 31. Mixing hole. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0031] First Embodiment

[0032] like Figure 1-8As shown, the gas borehole leakage monitoring device with multiple independent monitoring spaces provided by the present invention includes: an extraction pipe 1 connected to a gas extraction pipe and a gas detector assembly. The extraction pipe 1 is internally divided into multiple sections, namely a distal section 2, at least one intermediate section 3, a proximal section 4, and a transition section 5. After the extraction pipe 2 is inserted into the gas borehole, the distal section 2 is located at the deepest point of the gas borehole, the proximal section 4 is located near the outside of the gas borehole, and the intermediate section 3 is located between the distal section 2 and the proximal section 4. The distal section 2 and the intermediate section 3 are each provided with independent... The first exhaust channel 8 and the second exhaust channel 10 both pass through the proximal section 4, and the first exhaust channel 8 also passes through the middle section 3. A third exhaust channel 12 is provided on the proximal section 4. The gas extracted from the first exhaust channel 8, the second exhaust channel 10 and the third exhaust channel 12 all flow into the transition section 5 and enter the gas extraction main pipe. In this process, each exhaust channel discharges the gas extracted from different sections of the extraction pipe 1 without interfering with each other, laying the foundation for subsequent measurement of whether there is gas leakage at different sections.

[0033] The gas detector assembly includes a protective box 15, and a gas detector 16 is installed inside the protective box 15.

[0034] A suction valve assembly 14 is installed on each of the transition section 5, each of the first exhaust channels 8, each of the second exhaust channels 10, and each of the third exhaust channels 12. An inlet pipe and an outlet pipe are installed on the protective box 15. The outlet pipe is connected to the main gas extraction pipe, and the inlet pipe is connected to the suction valve assembly 14. When the inlet pipe is connected to the suction valve assembly 14, some of the gas in the extraction pipe 1 will enter the gas detector assembly through the suction valve assembly 14 and the inlet pipe. Because the main gas extraction pipe is connected to the gas pump station, the gas entering the gas detector assembly enters the main gas extraction pipe through the outlet pipe. When the gas enters the gas extraction assembly, the gas extraction assembly will detect the gas content in the gas and transmit the detection signal to the control center.

[0035] Since each exhaust channel is equipped with an extraction valve assembly 14, the entire device only requires one gas detector assembly to detect the gas content in different sections. During detection, the intake pipe only needs to be connected to different extraction valve assemblies 14.

[0036] Second Embodiment

[0037] A connector is rotatably mounted on the air inlet pipe. The connector can be connected to the air extraction valve assembly 14 to allow the gas in the extraction pipe 1 to enter the air inlet pipe so that the gas detector assembly can detect the gas.

[0038] like Figure 5-6As shown, the extraction valve assembly 14 includes a fixing block 17 fixedly installed on the gas extraction pipe 1. The fixing block 17 has a cylindrical groove 18, a first conical groove 19, and a second conical groove 22 inside. The cylindrical groove 18 is located above and connected to the first conical groove 19. The cone angles of both the first conical groove 19 and the second conical groove 22 point upwards. The fixing block 17 also has a movable rod inside. The movable rod consists of a first conical rod 20 located above and a second conical rod 21 located below, both fixed as a whole. The first conical rod 20 is located in the cylindrical groove 18 and the second conical groove 22. The conical rod 21 is located in the first conical groove 19, and both the first conical rod 20 and the second conical rod 21 are wrapped with a silicone layer. The silicone layer achieves a seal between the first conical rod 20 and the second conical groove, and between the second conical rod 20 and the first conical groove 19, thus forming a double seal to prevent gas in the extraction pipe 1 from overflowing through the extraction valve assembly 14. A spring 23 is fixedly installed on the top of the cylindrical groove 18, and the bottom end of the spring 23 is fixed to the top of the second conical rod 21. In the initial state, the spring 23 has an upward pulling force on the second conical rod 21, so that the second conical rod 21 can be stably located in the first conical groove 19.

[0039] The connector includes a cap 25 with internal threads, and a threaded section on the outside of the fixing block 17, allowing the cap 25 and the fixing block 17 to be threadedly connected. A push rod 26 is fixedly mounted on the cap 25, and the push rod 26 is adapted to a limiting groove 24 on the top of the first tapered rod 20. When the cap 25 is connected to the fixing block 17, the push rod 26 is inserted into the limiting groove 24 and pushes the first tapered rod 20 downward, thereby creating a gap between the first tapered rod 20 and the second tapered groove 22, and between the second tapered rod 21 and the first tapered groove 19. The gap allows gas in the extraction tube 1 to enter the cap 25. The top of the cap 25 has an exhaust hole 27. Gas entering the cap 25 will enter the air inlet pipe through the exhaust hole 27. When the push rod 26 pushes the first conical rod 20 downward, the push rod 26 is inserted into the limiting groove 24. This also has the effect of preventing the first conical rod 20 and the second conical rod 21 from shifting, ensuring that the first conical rod 20 and the second conical rod 21 can return to their correct positions accurately, and avoiding the phenomenon that the first conical rod 20 hits the top of the cylindrical groove 18 due to shifting.

[0040] A retaining ring 28 is fixed inside the cap 25, and a sealing gasket is fixed at the bottom of the retaining ring 28. When the cap 25 is fully installed on the fixing block 17, the sealing gasket is fully in contact with the top of the fixing block 17, thereby achieving a seal and preventing gas from overflowing through the gap between the cap 25 and the fixing block 17.

[0041] A filter screen 29 is fixedly installed at the bottom of the fixed block 17. The filter screen 29 is used to filter particulate impurities in the gas to prevent larger particulate impurities from entering the interior of the fixed block 17 and affecting the seal.

[0042] The air extraction valve assembly 14 is also threaded with a sealing cap 30. When the air extraction valve assembly 14 is not in use, i.e., no air extraction is performed, the sealing cap 30 is installed on the air extraction valve assembly 14 to prevent sharp objects from pushing the first conical rod 20 to move and causing air leakage.

[0043] Third Embodiment

[0044] like Figure 1-4 As shown, multiple partitions 6 are fixedly installed inside the extraction pipe 1. The first exhaust channel 8 is composed of partitions 6 and a first arc-shaped plate 7. One end of the first arc-shaped plate 7 is fixed to the partition 6, and both sides of the first arc-shaped plate 7 are fixed to the inner wall of the extraction pipe 1. The second exhaust channel 10 is composed of partitions 6 and a second arc-shaped plate 9. One end of the second arc-shaped plate 9 is fixed to the partition 6, and both sides of the second arc-shaped plate 9 are fixed to the inner wall of the extraction pipe 1. The third exhaust channel 12 is composed of partitions 6 and a third arc-shaped plate 11. One end of the third arc-shaped plate 11 is fixed to the partition 6. Plate 6 is fixed, and both sides of the third arc plate 6 are fixed to the inner wall of the extraction pipe 1. Multiple suction holes 13 are opened on the extraction pipe 1. Suction holes 13 are distributed on the distal section 2, the middle section 3, and the proximal section 4, except for the first exhaust channel 8 and the second exhaust channel 10. In this way, the gas output from different exhaust holes represents different segments, so that personnel can identify which segment the gas extracted by the different exhaust valve assembly 14 belongs to, which is more conducive to accurately judging the leakage segment later.

[0045] There are multiple third exhaust channels 12 arranged in a ring. Since the proximal section 4 is located closest to the port of the gas extraction borehole, it is the place with the highest probability of gas leakage. Therefore, the detection of this area is the focus. The multiple third exhaust channels 12 face different angles and each third exhaust channel 12 is equipped with an air extraction valve assembly 14. During the gas extraction detection process, by switching different air extraction valve assemblies 14, the approximate direction of the gas leakage can be determined (e.g., left or right, upper left, lower right, etc. of the gas extraction borehole), so that subsequent personnel can more accurately perform grouting and leak sealing around the borehole.

[0046] Fourth embodiment

[0047] like Figure 2As shown, the transition section 5 has a mixing hole 31 inside. The mixing hole 31 is a hole with a large diameter at both ends and a small diameter in the middle, similar to a Venturi tube. Its function is to mix the gases delivered from each exhaust channel. The principle is the same as the mixing principle of a Venturi tube.

[0048] Working Principle: During use, the air inlet pipe is first connected to the extraction valve assembly 14 on the transition section 5. When an abnormal leak is detected, personnel go to the site and, by replacing different extraction valve assemblies 14, determine which section the leak is in. If the leak is in the proximal section 4, the air inlet pipe is connected to different extraction valve assemblies 14 on the proximal section 4 to further determine the direction of the leak. Under normal operating conditions, the gas extracted from each section is collected in the transition section 5 through the corresponding exhaust channels, and after being fully mixed through the mixing hole 31, it enters the main gas extraction pipe. When testing is required, the gas detector assembly is connected to different exhaust channels through the switchable extraction valve assembly 14. The extraction valve assembly 14 adopts a double conical rod sealing structure, which remains normally closed under the action of the spring 23, ensuring airtightness when not being tested. During testing, rotating the cap 25 drives the top rod 26 to press down the first conical rod 20, opening the airflow channel and allowing gas from a specific section to enter the gas detector assembly for testing.

[0049] When the system detects an abnormal gas concentration, operators can precisely pinpoint the specific section where the leak is occurring by sequentially switching between the extraction valve assemblies 14 connected to different segments. In particular, for the near-end segment 4, which has the highest risk of leakage, multiple ring-shaped third exhaust channels 12 are installed. By detecting the gas composition in different channels, the specific direction of the leak can be further determined, providing precise spatial location information for subsequent leak-sealing operations. The entire detection process can be completed by a single gas detector 16, ensuring both detection accuracy and improved equipment utilization efficiency. The filters 29 and sealing caps 30 equipped on each extraction valve assembly 14 effectively prevent interference from impurities and accidental leaks, ensuring long-term stable operation of the system.

[0050] In summary, this device can quickly and accurately identify and locate gas leaks in gas boreholes, significantly improving the safety management level of coal mine gas extraction.

Claims

1. A gas borehole leakage monitoring device with multiple independent monitoring spaces, characterized in that, include: The gas extraction pipe (1) and the gas detector assembly are connected to the gas extraction pipe. The gas extraction pipe (1) is divided into multiple sections, namely a distal section (2), at least one intermediate section (3), a proximal section (4), and a transition section (5). The intermediate section (3) is located between the distal section (2) and the proximal section (4). The distal section (2) and the intermediate section (3) are respectively provided with an independent first exhaust channel (8) and a second exhaust channel (10). The first exhaust channel (8) and the second exhaust channel (10) both pass through the proximal section (4), and the first exhaust channel (8) also passes through the intermediate section (3). The proximal section (4) is provided with a third exhaust channel. The gas extracted from the exhaust channels (12), the first exhaust channel (8), the second exhaust channel (10) and the third exhaust channel (12) all flow into the transition section (5) and enter the gas extraction main pipe. The gas detector assembly includes a protective box (15). A gas detector (16) is installed inside the protective box (15). An air extraction valve assembly (14) is installed on the transition section (5) and each of the first exhaust channels (8), each of the second exhaust channels (10) and each of the third exhaust channels (12). An air inlet pipe and an air outlet pipe are installed on the protective box (15). The air outlet pipe is connected to the gas extraction main pipe, and the air inlet pipe is connected to the air extraction valve assembly (14). The extraction valve assembly (14) includes a fixing block (17) fixedly installed on the gas extraction pipe (1). The fixing block (17) has a cylindrical groove (18), a first conical groove (19), and a second conical groove (22) inside. The cylindrical groove (18) is located above and connected to the first conical groove (19). The cone angles of the first conical groove (19) and the second conical groove (22) are both upward. The fixing block (17) also has a movable rod inside. The movable rod is connected to the first conical groove (19) located above. A conical rod (20) and a second conical rod (21) located below are fixed together as a whole. The first conical rod (20) is located in the cylindrical groove (18) and the second conical groove (22), and the second conical rod (21) is located in the first conical groove (19). Both the first conical rod (20) and the second conical rod (21) are covered with a silicone layer. A spring (23) is fixedly installed on the top of the cylindrical groove (18), and the bottom end of the spring (23) is fixed to the top of the second conical rod (21).

2. A gas borehole leakage monitoring device with multiple independent monitoring spaces according to claim 1, characterized in that, A connector is rotatably mounted on the intake pipe. The connector includes a cap (25) with an internal thread. A thread is opened on the outside of the fixing block (17). The cap (25) and the fixing block (17) can be threadedly connected. A top rod (26) is fixedly mounted on the cap (25). The top rod (26) is adapted to the limiting groove (24) at the top of the first conical rod (20). An exhaust hole (27) is opened at the top of the cap (25).

3. A gas borehole leakage monitoring device with multiple independent monitoring spaces according to claim 2, characterized in that, A retaining ring (28) is fixed inside the cap (25), and a sealing gasket is fixed at the bottom of the retaining ring (28).

4. A gas borehole leakage monitoring device with multiple independent monitoring spaces according to claim 1, characterized in that, A filter screen (29) is fixedly installed at the bottom of the fixed block (17), and the filter screen (29) is used to filter particulate impurities in the gas.

5. A gas borehole leakage monitoring device with multiple independent monitoring spaces according to claim 1, characterized in that, A sealing cap (30) is also threaded onto the air extraction valve assembly (14).

6. A gas borehole leakage monitoring device with multiple independent monitoring spaces according to claim 1, characterized in that, The extraction pipe (1) is internally fixedly equipped with multiple partitions (6). The first exhaust channel (8) is composed of partitions (6) and a first arc-shaped plate (7). One end of the first arc-shaped plate (7) is fixed to the partition (6), and both sides of the first arc-shaped plate (7) are fixed to the inner wall of the extraction pipe (1). The second exhaust channel (10) is composed of partitions (6) and a second arc-shaped plate (9). One end of the second arc-shaped plate (9) is fixed to the partition (6), and both sides of the second arc-shaped plate (9) are fixed to the inner wall of the extraction pipe (1). The third exhaust channel (12) is composed of a partition (6) and a third arc plate (11). One end of the third arc plate (11) is fixed to the partition (6), and both sides of the third arc plate (11) are fixed to the inner wall of the extraction pipe (1). Multiple suction holes (13) are provided on the extraction pipe (1). Suction holes (13) are provided on the distal section (2), the middle section (3) and the proximal section (4), except for the first exhaust channel (8) and the second exhaust channel (10).

7. A gas borehole leakage monitoring device with multiple independent monitoring spaces according to claim 1, characterized in that, There are multiple third exhaust channels (12), which are arranged in a ring. The multiple third exhaust channels (12) face different angles and each third exhaust channel (12) is equipped with an air extraction valve assembly (14).

8. A gas borehole leakage monitoring device with multiple independent monitoring spaces according to claim 1, characterized in that, The transition section (5) has a mixing hole (31) inside, which is a hole with a large diameter at both ends and a small diameter in the middle.

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