CN-121976750-A - Method and device for testing multi-parameter attenuation trend of gas in directional drilling of coal seam

Abstract

The invention provides a method and a device for testing a multi-parameter attenuation trend of directional drilling gas in a coal seam, wherein the method comprises the steps of S1, constructing a directional main hole between a return airway of the coal seam and a transport roadway, S2, constructing a plurality of branch holes in the coal seam, S3, paving a drainage pipe in the directional main hole, respectively paving an observation pipe in each branch hole, S4, setting a first detection component for detecting gas parameters at the orifice of the directional main hole, setting a plurality of second detection components for detecting gas parameters in the corresponding branch holes, S5, sealing the directional main hole by adopting a main hole sealing device, sealing each branch hole by adopting a plurality of branch hole sealing devices, and S6, analyzing gas distribution characteristics at different lengths of the coal seam by the gas parameters detected by the first detection component and the second detection component. By the adoption of the scheme, the problem that in the prior art, the attenuation trend test method and device for the directional long-drilling gas parameters along the coal seam increase along with the coal seam depth are poor in measurement effect is solved.

Inventors

• SHAO WENQI
• YANG LEILEI
• Su Boru
• HAN YOULONG
• ZHANG YI
• SU KE
• LIU YULONG
• ZHAO YUDE
• YAN KE
• XU TENGFEI
• LI ZHIHENG

Assignees

• 国家能源集团乌海能源有限责任公司

Dates

Publication Date

20260505

Application Date

20260319

Claims (13)

1. 1. The method for testing the multi-parameter attenuation trend of the gas in the directional drilling of the coal seam is characterized by comprising the following steps of: s1, constructing a directional main hole (51) between a return airway (61) and a transport airway (62) of a coal seam; S2, constructing a plurality of branch holes (52) which are arranged at intervals along the coal seam, wherein one end of each branch hole (52) is communicated with the directional main hole (51), and the other end of each branch hole is communicated with the air return roadway (61); S3, paving a suction pipe (71) in the directional main hole (51), wherein one end of the suction pipe (71) is communicated with a suction pipeline (63), each branch hole (52) is respectively paved with an observation pipe (72), one end of each observation pipe (72) is arranged at the intersection of the branch hole (52) and the return air lane (61), the gas environment and the gas parameters in the suction pipe (71) and the directional main hole (51) are consistent, and the gas environment and the gas parameters in each observation pipe (72) and the corresponding branch hole (52) are consistent; s4, arranging a first detection assembly (10) and a plurality of second detection assemblies (20), wherein the first detection assembly (10) is used for detecting gas parameters at the orifice of the directional main hole (51), and each second detection assembly (20) is used for detecting gas parameters in a corresponding branch hole (52); S5, sealing the directional main holes (51) by adopting a main hole sealing device (30), and sealing each branch hole (52) by adopting a plurality of branch hole sealing devices (40); S6, analyzing the gas distribution characteristics of different lengths of the along-seam coal through the gas parameters detected by the first detection assembly (10) and the second detection assembly (20).
2. 2. The method for testing the attenuation trend of coal seam directional drilling gas multiparameter according to claim 1, wherein the step S4 further comprises the steps of installing a plurality of transmission cables (73) in the directional main hole (51) and the plurality of branch holes (52), connecting the main hole sealing device (30) with the main hole controller (11) through the plurality of transmission cables (73), and connecting the plurality of branch hole sealing devices (40) with the plurality of branch hole controllers (21) through the plurality of transmission cables (73) in a one-to-one correspondence mode.
3. 3. The method for testing the attenuation trend of the directional drilling gas multiple parameters of the coal seam according to claim 2, wherein the first detection assembly (10) is connected with the main hole controller (11) through a plurality of transmission cables (73), the second detection assemblies (20) are connected with the branch hole controllers (21) through a plurality of transmission cables (73) in a one-to-one correspondence manner, and the gas flow, the gas concentration and the gas pressure at different lengths of the coal seam are measured through the first detection assembly (10) and the second detection assemblies (20).
4. 4. The method for testing the attenuation trend of multiple parameters of directional drilling gas in a coal seam according to claim 1, wherein the step S5 further comprises connecting the directional main hole (51) with a gas extraction pump (74) after the sealing of the directional main hole (51) and the plurality of branch holes (52) is completed for the first time.
5. 5. The method for testing the attenuation trend of the coal seam directional drilling gas multiple parameters according to claim 1, wherein in the step S6, the first detection component (10) and the plurality of second detection components (20) are connected with a multi-parameter acquisition and control device (75) arranged on the ground, the multi-parameter acquisition and control device (75) integrates and processes the gas parameters detected by the first detection component (10) and the second detection component (20), the gas distribution characteristics at different depths of the coal seam directional drilling are analyzed through data of different extraction time lengths, the drilling distribution and drilling extraction pressure are adjusted, and the directional drilling gas extraction parameters are optimized.
6. 6. The method for testing the attenuation trend of the coal seam directional drilling gas multiparameter according to claim 1, wherein the method further comprises the step of washing holes of the directional main hole (51) and the branch holes (52) after construction between the step of S2 and the step of S3, and flushing out coal dust and rock dust generated in the construction process.
7. 7. A test device, characterized in that the test device adopts the method for testing the multi-parameter attenuation trend of coal seam directional drilling gas according to any one of claims 1 to 6, the test device comprises a first detection component (10), a plurality of second detection components (20), a main hole sealing device (30) and a plurality of branch hole sealing devices (40), the first detection component (10) is used for detecting gas parameters at the orifice of the directional main hole (51), each second detection component (20) is used for detecting gas parameters in a corresponding branch hole (52), the main hole sealing device (30) is used for sealing the directional main hole (51), and each branch hole sealing device (40) is used for sealing a corresponding branch hole (52).
8. 8. The test device according to claim 7, wherein the main hole sealing device (30) comprises a first inflation conduit (31), a first booster pump (32), a plurality of main hole bags (33) and a plurality of main hole pressure sensors (34), the plurality of main Kong Nangdai (33) are arranged in a gap between the directional main hole (51) and the extraction pipe (71), one end of the first inflation conduit (31) is connected with the first booster pump (32), the other end of the first inflation conduit (31) is connected with the plurality of main Kong Nangdai (33), the first booster pump (32) is arranged in the extraction pipeline (63) and is positioned at a crossing position of the extraction pipeline (63) and the directional main hole (51), and each main hole pressure sensor (34) is respectively arranged in one main Kong Nangdai (33).
9. 9. The test device according to claim 8, wherein the first detection assembly (10) comprises a main hole controller (11) and a comprehensive collector (12), the main hole controller (11) is arranged in the extraction pipeline (63), the comprehensive collector (12) is located at the end of the extraction pipe (71) and in the extraction pipeline (63), the comprehensive collector (12), the first booster pump (32) and the plurality of main hole pressure sensors (34) are all electrically connected with the main hole controller (11), and the comprehensive collector (12) is used for detecting gas flow, pressure and concentration parameters at the orifice of the directional main hole (51).
10. 10. The test device according to claim 7, wherein each of the branch hole sealing devices (40) includes a second air-filling duct (41), a second booster pump (42), a plurality of branches Kong Nangdai (43) and a plurality of branch hole pressure sensors (44), a plurality of the branches Kong Nangdai (43) are provided in a gap between each of the branch holes (52) and the corresponding observation tube (72), one end of the second air-filling duct (41) is connected to the second booster pump (42) in each of the branch holes (52), the other end of the second air-filling duct (41) is connected to the plurality of branches Kong Nangdai (43), the second booster pump (42) is provided in the transport lane (62), and each of the branch hole pressure sensors (44) is provided in one of the branches Kong Nangdai (43) at a crossing of the branch hole (52) and the transport lane (62), respectively.
11. 11. The test device according to claim 10, wherein each of the second detection assemblies (20) includes a branch hole controller (21) and a pressure collector (22), the branch hole controller (21) being disposed in the transport lane (62), the pressure collector (22) being located at an end of the observation tube (72) and in the transport lane (62), the second booster pump (42), the branch hole pressure sensor (44) and the pressure collector (22) in each of the branch hole sealing devices (40) being electrically connected with the branch hole controller (21), each of the pressure collectors (22) being configured to detect a gas pressure in the corresponding branch hole (52).
12. 12. The test device according to claim 11, wherein each of the second detection assemblies (20) further comprises a flow collector (23) and a concentration collector (24), in each of the branch holes (52), the concentration collector (24) is disposed at an end of the observation tube (72) near the directional main hole (51), a plurality of the branches Kong Nangdai (43) are located between the pressure collector (22) and the flow collector (23), the flow collector (23) and the concentration collector (24) are each electrically connected with the corresponding branch hole controller (21), the flow collector (23) is configured to detect a gas flow rate in the corresponding branch hole (52), and the concentration collector (24) is configured to detect a gas concentration in the corresponding branch hole (52).
13. 13. The test device according to claim 12, wherein each flow collector (23) further comprises a flow sensor (231) and a flow conduit (232), the flow conduit (232) being arranged in the viewing tube (72) and the diameter of the flow conduit (232) being smaller than the diameter of the corresponding viewing tube (72), the flow sensor (231) being arranged on a side wall of the viewing tube (72) and being connected to the flow conduit (232), the flow sensor (231) being arranged to detect the flow of gas in the flow conduit (232).

Description

Method and device for testing multi-parameter attenuation trend of gas in directional drilling of coal seam Technical Field The invention relates to the technical field of coal mine gas extraction, in particular to a method and a device for testing multi-parameter attenuation trend of gas in directional drilling along a coal seam. Background During coal mine exploitation, gas control is an important link for guaranteeing coal mine safety exploitation, and the directional long-drilling coal seam gas extraction technology is widely adopted in coal mine gas control along with the maturation and popularization of the directional long-drilling technology. As the firmness coefficients, the air permeability coefficients and the like of different coal beds are different, the negative pressure and the extraction effect in the holes are obviously weakened along with the increase of the length of the holes, and the use of directional long holes is seriously influenced and restricted, so that the reasonable determination of the parameters such as the negative pressure, the flow and the gas concentration in the holes plays an important role in coal mine gas control, the comprehensive research on the negative pressure, the gas flow and the gas concentration in the holes is important, the further optimization of the directional long holes parameters and the improvement of the gas extraction effect are facilitated, however, in the prior art, the testing method and the testing device for the gas parameters of the directional holes in the coal mines are imperfect, and the accurate measurement and analysis of the gas parameters at different positions of the directional holes cannot be realized, so that the effects of optimizing the directional long holes parameters and improving the gas extraction efficiency cannot be achieved. Disclosure of Invention The invention provides a method and a device for testing the attenuation trend of multiple parameters of directional drilling gas along a coal seam, which are used for solving the problems of poor measurement effect of the method and the device for testing the attenuation trend and characteristics of directional drilling gas parameters along the coal seam with the increase of the depth of the coal seam in the prior art. According to one aspect of the invention, a method for testing the attenuation trend of multiple parameters of gas in directional drilling along a coal seam is provided, which comprises the following steps: S1, constructing a directional main hole between a return airway of a coal seam and a transport airway; s2, constructing a plurality of branch holes which are arranged at intervals along the coal seam, wherein one end of each branch hole is communicated with the directional main hole, and the other end of each branch hole is communicated with the return airway; S3, paving a drainage pipe in the directional main hole, wherein one end of the drainage pipe is communicated with a drainage pipeline, paving an observation pipe in each branch hole, arranging one end of each observation pipe at the intersection of the branch hole and the return airway, and enabling the gas environment and the gas parameters in the drainage pipe and the directional main hole to be consistent, and enabling the gas environment and the gas parameters in each observation pipe and the corresponding branch hole to be consistent; s4, arranging a first detection assembly and a plurality of second detection assemblies, wherein the first detection assembly is used for detecting gas parameters at the orifice of the directional main hole, and each second detection assembly is used for detecting the gas parameters in a corresponding branch hole; S5, sealing the directional main holes by using a main hole sealing device, and sealing each branch hole by using a plurality of branch hole sealing devices; s6, analyzing gas distribution characteristics of different lengths of the along-seam through the gas parameters detected by the first detection assembly and the second detection assembly. Further, S4 also comprises the steps of installing a plurality of transmission cables in the directional main hole and the plurality of branch holes respectively, connecting the main hole sealing device with the main hole controller through the plurality of transmission cables, and connecting the plurality of branch hole sealing devices with the plurality of branch hole controllers in a one-to-one correspondence manner through the plurality of transmission cables. Further, the first detection assembly is connected with the main hole controller through the transmission cables, the second detection assemblies are connected with the branch hole controllers in a one-to-one correspondence mode through the transmission cables, and the gas flow, the gas concentration and the gas pressure at different lengths of the coal seam are measured through the first detection assembly and the second detection assemblies. And S5, conne