Method and device for testing multi-parameter attenuation trend of gas by directional drilling along coal seam

Abstract

The invention provides a coal-seam-following directional drilling gas multi-parameter attenuation trend testing method and testing device. The coal-seam-following directional drilling gas multi-parameter attenuation trend testing method comprises the steps that S1, a directional main hole is constructed between a coal-seam-following air return roadway and a transportation roadway; s2, a plurality of branch holes are constructed along the coal seam; s3, an extraction pipe is laid in the directional main hole, and an observation pipe is laid in each branch hole; s4, a first detection assembly is arranged to detect gas parameters at the opening of the directional main hole, and a plurality of second detection assemblies are arranged to detect gas parameters in the corresponding branch holes; s5, a main hole sealing device is adopted to seal the directional main hole, and a plurality of branch hole sealing devices are adopted to seal each branch hole; and S6, analyzing gas distribution characteristics at different lengths along the coal seam according to the gas parameters detected by the first detection assembly and the second detection assembly. By means of the scheme, the problem that in the prior art, a method and device for testing the attenuation trend of coal seam oriented long drill hole gas parameters along with increase of the coal seam depth are poor in measurement effect is solved.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas extraction technology, and more specifically, to a method and apparatus for testing the multi-parameter attenuation trend of gas in directional boreholes along coal seams. Background Technology

[0002] During coal mining, gas control is a crucial aspect of ensuring safe operation. With the maturity and widespread adoption of directional drilling technology, this technique is widely used for coal seam gas extraction. However, due to variations in the firmness and permeability of different coal seams, the extraction negative pressure and efficiency decrease significantly with increasing borehole length, severely impacting and restricting the use of directional drilling. Therefore, rationally determining parameters such as borehole extraction negative pressure, flow rate, and gas concentration is essential for coal mine gas control. Comprehensive research on these parameters is crucial for optimizing directional drilling parameters and improving gas extraction efficiency. However, current technologies lack adequate testing methods and equipment for directional drilling gas parameters, hindering accurate measurement and analysis of gas parameters at different locations within the borehole and preventing the optimization of directional drilling parameters and improvement of gas extraction efficiency. Summary of the Invention

[0003] This invention provides a method and apparatus for testing the attenuation trend of gas parameters in directional boreholes along coal seams, in order to solve the problem that the existing methods and apparatus for testing the attenuation trend and characteristics of gas parameters in long directional boreholes along coal seams with increasing coal seam depth have poor measurement results.

[0004] According to one aspect of the present invention, a method for testing the multi-parameter attenuation trend of gas in directional boreholes along coal seams is provided, comprising:

[0005] S1. Construct the directional main shaft between the return airway and the transport roadway along the coal seam;

[0006] S2. Multiple branch holes are constructed along the coal seam at intervals. One end of each branch hole is connected to the directional main hole, and the other end is connected to the return airway.

[0007] S3. Lay an extraction pipe in the main directional borehole, with one end of the extraction pipe connected to the extraction pipeline. Lay an observation pipe in each branch borehole, with one end of each observation pipe located at the intersection of the branch borehole and the return airway. The gas environment and gas parameters in the extraction pipe are consistent with those in the main directional borehole, and the gas environment and gas parameters in each observation pipe are consistent with those in the corresponding branch borehole.

[0008] S4. Set up a first detection component and multiple second detection components. The first detection component is used to detect the gas parameters at the orifice of the directional main hole, and each second detection component is used to detect the gas parameters in a corresponding branch hole.

[0009] S5. Use a main hole sealing device to seal the directional main hole, and use multiple branch hole sealing devices to seal each branch hole separately;

[0010] S6. Analyze the gas distribution characteristics at different lengths along the coal seam using the gas parameters detected by the first and second detection components.

[0011] Furthermore, S4 also includes: installing multiple transmission cables in the directional main hole and multiple branch holes respectively, connecting the main hole sealing device to the main hole controller through the multiple transmission cables, and connecting the multiple branch hole sealing devices to the multiple branch hole controllers one by one through the multiple transmission cables.

[0012] Furthermore, the first detection component is connected to the main hole controller via multiple transmission cables, and multiple second detection components are connected to multiple branch hole controllers one by one via multiple transmission cables. The gas flow rate, gas concentration, and gas pressure at different lengths along the coal seam are measured by the first detection component and the multiple second detection components.

[0013] Furthermore, S5 also includes: after the initial sealing of the directional main borehole and multiple branch boreholes, connecting the directional main borehole to the gas extraction pump.

[0014] Furthermore, in S6, the first detection component and multiple second detection components are connected to a multi-parameter acquisition and control device installed on the ground. The multi-parameter acquisition and control device integrates and processes the gas parameters detected by the first and second detection components. By analyzing the gas distribution characteristics at different depths of the directional borehole along the coal seam through data analysis of different extraction durations, the borehole distribution and borehole extraction pressure are adjusted to optimize the gas extraction parameters of the directional borehole.

[0015] Furthermore, between S2 and S3, the process also includes: performing a hole-washing operation on the completed directional main hole and multiple branch holes to flush out the coal and rock debris generated during construction.

[0016] According to another aspect of the present invention, a testing device is provided. The testing device adopts the above-described method for testing the multi-parameter attenuation trend of gas in directional drilling along coal seams. The testing device includes a first detection component, multiple second detection components, a main borehole sealing device, and multiple branch borehole sealing devices. The first detection component is used to detect the gas parameters at the orifice of the directional main borehole. Each second detection component is used to detect the gas parameters in a corresponding branch borehole. The main borehole sealing device is used to seal the directional main borehole, and each branch borehole sealing device is used to seal a corresponding branch borehole.

[0017] Furthermore, the main borehole sealing device includes a first inflation conduit, a first booster pump, multiple main borehole bags, and multiple main borehole pressure sensors. The multiple main borehole bags are disposed in the gap between the directional main borehole and the extraction pipe. One end of the first inflation conduit is connected to the first booster pump, and the other end of the first inflation conduit is connected to the multiple main borehole bags. The first booster pump is disposed in the extraction pipeline and located at the intersection of the extraction pipeline and the directional main borehole. Each main borehole pressure sensor is disposed in one main borehole bag.

[0018] Furthermore, the first detection component includes a main borehole controller and a comprehensive data acquisition unit. The main borehole controller is located in the extraction pipeline, and the comprehensive data acquisition unit is located at the end of the extraction pipeline and in the extraction pipeline. The comprehensive data acquisition unit, the first booster pump, and multiple main borehole pressure sensors are all electrically connected to the main borehole controller. The comprehensive data acquisition unit is used to detect the gas flow rate, pressure, and concentration parameters at the orifice of the directional main borehole.

[0019] Furthermore, each branch hole sealing device includes a second inflation conduit, a second booster pump, multiple branch hole bags, and multiple branch hole pressure sensors. The multiple branch hole bags are disposed in the gap between each branch hole and the corresponding observation tube. In each branch hole, one end of the second inflation conduit is connected to the second booster pump, and the other end of the second inflation conduit is connected to multiple branch hole bags. The second booster pump is disposed in the transport tunnel and located at the intersection of the branch hole and the transport tunnel. Each branch hole pressure sensor is disposed in one branch hole bag.

[0020] Furthermore, each second detection component includes a branch hole controller and a pressure collector. The branch hole controller is located in the transport tunnel, and the pressure collector is located at the end of the observation tube and in the transport tunnel. The second booster pump, branch hole pressure sensor, and pressure collector in each branch hole sealing device are all electrically connected to the branch hole controller. Each pressure collector is used to detect the gas pressure in the corresponding branch hole.

[0021] Furthermore, each second detection component also includes a flow collector and a concentration collector. In each branch port, the concentration collector is located at the end of the observation tube near the directional main port. Multiple branch port bags are located between the pressure collector and the flow collector. Both the flow collector and the concentration collector are electrically connected to the corresponding branch port controller. The flow collector is used to detect the gas flow rate in the corresponding branch port, and the concentration collector is used to detect the gas concentration in the corresponding branch port.

[0022] Furthermore, each flow collector also includes a flow sensor and a flow conduit. The flow conduit is disposed inside the observation tube, and the diameter of the flow conduit is smaller than the diameter of the corresponding observation tube. The flow sensor is disposed on the side wall of the observation tube and connected to the flow conduit. The flow sensor is used to detect the gas flow rate inside the flow conduit.

[0023] By applying the technical solution of this invention, a directional main borehole and multiple branch boreholes are constructed along the coal seam, forming a gas parameter monitoring network with the directional main borehole as the trunk and the multiple branch boreholes as branches. By laying extraction pipes and connecting them within the directional main borehole, the gas environment within the extraction pipes is kept consistent with that within the directional main borehole. Simultaneously, observation pipes are laid in each branch borehole, ensuring that the gas environment within each observation pipe matches the gas state at the corresponding branch borehole location. Furthermore, the arrangement of the extraction pipes and multiple observation pipes provides installation space for subsequent first detection components, multiple second detection components, a main borehole sealing device, and multiple branch borehole sealing devices, facilitating the detection of more uniform and stable gas, and improving the accuracy and reliability of the detection. The first detection component is used to detect the directional main borehole. The gas parameters at the borehole opening provide initial data for studying gas parameters at different depths in directional boreholes in coal mines. A second detection component is installed in each branch borehole to measure the gas parameters within each branch borehole, achieving accurate detection of gas parameters at different depths along the coal seam. A main borehole sealing device is installed to seal the directional main borehole, and multiple branch borehole sealing devices are installed to seal each branch borehole separately, preventing gas leakage from affecting the accuracy and reliability of the detection. By detecting the gas conditions at the borehole opening of the directional main borehole and in the branch boreholes at different depths, more comprehensive gas parameters in directional boreholes are obtained, facilitating the optimization of parameters for long directional boreholes, rationally planning the location of directional boreholes, and helping to improve gas extraction efficiency. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1A schematic diagram of a method for testing the multi-parameter attenuation trend of gas in directional drilling along a coal seam, provided by an embodiment of the present invention, is shown.

[0026] Figure 2 A schematic diagram of the structure in the directional main hole is shown;

[0027] Figure 3 A schematic diagram of the structure in each branch hole is shown;

[0028] Figure 4 A schematic diagram of the structure of a testing apparatus provided according to an embodiment of the present invention is shown.

[0029] The above figures include the following reference numerals:

[0030] 10. First detection component;

[0031] 11. Main borehole controller; 12. Integrated data acquisition unit;

[0032] 20. Second detection component;

[0033] 21. Branch hole controller; 22. Pressure acquisition device;

[0034] 23. Flow collector; 231. Flow sensor; 232. Flow conduit;

[0035] 24. Concentration collector;

[0036] 30. Main hole sealing device;

[0037] 31. First inflation conduit; 32. First booster pump; 33. Main port bladder; 34. Main port pressure sensor;

[0038] 40. Branch hole sealing device;

[0039] 41. Second inflation conduit; 42. Second booster pump; 43. Branch port bladder; 44. Branch port pressure sensor;

[0040] 51. Orientation main hole;

[0041] 52. Branch hole;

[0042] 521. Connection port; 522. Observation port;

[0043] 61. Return airway; 62. Transport airway; 63. Extraction pipeline;

[0044] 71. Extraction pipe; 72. Observation pipe; 73. Transmission cable; 74. Gas extraction pump; 75. Multi-parameter acquisition and control device. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] like Figures 1 to 4 As shown, an embodiment of the present invention provides a method for testing the multi-parameter attenuation trend of gas in directional boreholes along coal seams, comprising:

[0047] S1. Construct the directional main shaft 51 between the return airway 61 and the transport roadway 62 along the coal seam;

[0048] S2. Multiple branch holes 52 are constructed along the coal seam at intervals. One end of each branch hole 52 is connected to the directional main hole 51, and the other end is connected to the return airway 61.

[0049] S3. Lay an extraction pipe 71 in the main directional borehole 51. One end of the extraction pipe 71 is connected to the extraction pipeline 63. Lay an observation pipe 72 in each branch borehole 52. One end of each observation pipe 72 is located at the intersection of the branch borehole 52 and the return airway 61. The gas environment and gas parameters in the extraction pipe 71 are the same as those in the main directional borehole 51. The gas environment and gas parameters in each observation pipe 72 are the same as those in the corresponding branch borehole 52.

[0050] S4. Set a first detection component 10 and multiple second detection components 20. The first detection component 10 is used to detect the gas parameters at the orifice of the directional main hole 51, and each second detection component 20 is used to detect the gas parameters in a corresponding branch hole 52.

[0051] S5. The main hole sealing device 30 is used to seal the directional main hole 51, and the multiple branch hole sealing devices 40 are used to seal each branch hole 52 respectively.

[0052] S6. Analyze the gas distribution characteristics at different lengths along the coal seam using the gas parameters detected by the first detection component 10 and the second detection component 20.

[0053] By applying the technical solution of this invention, a directional main borehole 51 and multiple branch boreholes 52 are constructed along the coal seam to form a gas parameter monitoring network with the directional main borehole 51 as the trunk and the multiple branch boreholes 52 as branches. By laying an extraction pipe 71 in the directional main borehole 51 and connecting it to an extraction pipeline 63, the gas environment within the extraction pipe 71 is kept consistent with that within the directional main borehole 51. Simultaneously, observation pipes 72 are laid in each branch borehole 52, ensuring that the gas environment within each observation pipe 72 is consistent with the gas state at the corresponding branch borehole 52 location. Furthermore, the installation of the extraction pipe 71 and multiple observation pipes 72 provides installation space for the subsequent first detection component 10, multiple second detection components 20, main borehole sealing device 30, and multiple branch borehole sealing devices 40, facilitating the detection of more uniform and stable gas and improving the accuracy and reliability of the detection. By setting up the first detection... Component 10 detects the gas parameters at the opening of the directional main borehole 51, providing initial data for studying the gas parameters at different depths in directional boreholes in coal mines. A second detection component 20 is set in each branch borehole 52 to measure the gas parameters within each branch borehole 52, achieving accurate detection of gas parameters at different depths along the coal seam. A main borehole sealing device 30 is set to seal the directional main borehole 51, and multiple branch borehole sealing devices 40 are set to seal each branch borehole 52, preventing gas leakage from the borehole and affecting the accuracy and reliability of the detection. By detecting the gas conditions at the opening of the directional main borehole 51 and within the branch boreholes 52 at different depths, more comprehensive gas parameters in the directional borehole are obtained, facilitating the optimization of parameters for long directional boreholes and the rational planning of directional borehole locations, which helps improve gas extraction efficiency.

[0054] like Figure 2 , Figure 3 As shown, S4 further includes: installing multiple transmission cables 73 in the directional main hole 51 and multiple branch holes 52 respectively, connecting the main hole sealing device 30 to the main hole controller 11 through the multiple transmission cables 73, and connecting the multiple branch hole sealing devices 40 to the multiple branch hole controllers 21 one by one through the multiple transmission cables 73.

[0055] In this embodiment, the main hole sealing device 30 is connected to the main hole controller 11 through multiple transmission cables 73, so that the sealing status of the main hole sealing device 30 can be fed back to the main hole controller 11 in a timely manner. At the same time, the main hole controller 11 can control and adjust the main hole sealing device 30 according to different sealing statuses, ensuring the sealing performance of the directional main hole 51.

[0056] Multiple branch hole sealing devices 40 are connected to multiple branch hole controllers 21 one by one through multiple transmission cables 73. The sealing status of each branch hole sealing device 40 can be transmitted to the corresponding branch hole controller 21 in a timely manner. At the same time, the multiple branch hole controllers 21 can control and adjust each branch hole sealing device 40 according to different sealing statuses, ensuring the sealing of multiple branch holes 52.

[0057] This configuration ensures that the sealing status of the main directional borehole 51 and multiple branch boreholes 52 can be detected and dynamically adjusted in real time, avoiding sealing failure caused by changes in the sealing status due to changes in the gas environment inside the borehole. It also ensures the sealing performance of the main directional borehole 51 and multiple branch boreholes 52, and improves the stability and reliability of gas parameter testing during gas extraction.

[0058] In some embodiments, the first detection component 10 is connected to the main hole controller 11 via multiple transmission cables 73, and multiple second detection components 20 are connected to multiple branch hole controllers 21 in a one-to-one correspondence via multiple transmission cables 73. The gas flow rate, gas concentration, and gas pressure at different lengths along the coal seam are measured by the first detection component 10 and the multiple second detection components 20.

[0059] In this embodiment, the first detection component 10 is connected to the main borehole controller 11 through multiple transmission cables 73, so that the gas flow rate, gas concentration and gas pressure signals collected by the first detection component 10 at the orifice of the directional main borehole 51 can be transmitted to the main borehole controller 11 in real time through an independent transmission channel, avoiding signal interference and data mixing, and improving the accuracy and reliability of the detection data.

[0060] Multiple second detection components 20 are connected one-to-one with multiple branch hole controllers 21 by multiple transmission cables 73, ensuring that the gas flow rate, gas concentration and gas pressure signals in each branch hole 52 are independently detected by the corresponding second detection component 20 and transmitted to the corresponding branch hole controller 21 via the transmission cables 73, avoiding signal interference and data mixing, and improving the accuracy and reliability of the detection data.

[0061] This setup enables independent detection of gas parameters in the main directional borehole 51 and each branch borehole 52, avoiding the parameter confusion and insufficient accuracy problems caused by the shared transmission path in traditional technologies, and providing reliable data support for the optimization of gas extraction in directional drilling.

[0062] like Figure 4 As shown, S5 also includes: after the initial sealing of the directional main hole 51 and multiple branch holes 52, connecting the directional main hole 51 to the gas extraction pump 74.

[0063] In this embodiment, through the establishment of this connection, the negative pressure provided by the gas extraction pump 74 can be transmitted along the extraction pipe 71 to a deeper depth in the directional main hole 51, and simultaneously to multiple branch holes 52 to generate gas state changes. This allows the gas parameters collected by the first detection component 10 and the second detection component 20 to truly reflect the gas distribution characteristics at different depths along the coal seam under dynamic extraction conditions. This avoids the problem of test data deviating from the actual operating state due to the failure to start the extraction power source after sealing the hole, and improves the accuracy and engineering guidance value of the test data.

[0064] like Figure 4 As shown, in S6, the first detection component 10 and multiple second detection components 20 are connected to the multi-parameter acquisition and control device 75 installed 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 components 20. By analyzing the gas distribution characteristics at different depths of the directional borehole along the coal seam through data analysis of different extraction durations, the borehole distribution and borehole extraction pressure are adjusted to optimize the gas extraction parameters of the directional borehole.

[0065] In this embodiment, the first detection component 10 and multiple second detection components 20 are connected to a multi-parameter acquisition and control device 75 installed on the ground. The detected multi-point gas parameters are transmitted in real time to the multi-parameter acquisition and control device 75 for centralized integration and processing analysis. Based on time-series data of different extraction durations, the multi-parameter acquisition and control device 75 analyzes the gas distribution characteristics and dynamic evolution of each measuring point at different depths in the directional borehole along the coal seam, identifies gas-rich areas, low extraction efficiency areas, and pressure response lag areas, which facilitates subsequent adjustments to the spatial layout of the borehole and dynamic adjustment of the negative pressure setpoint of the extraction pipeline. This helps to achieve closed-loop optimization from data acquisition and analysis to parameter feedback control, thereby improving the efficiency and stability of the overall extraction system.

[0066] In some embodiments, between S2 and S3, a hole-washing operation is further performed on the completed directional main hole 51 and multiple branch holes 52 to flush out the coal dust and rock debris generated during the construction process.

[0067] In this embodiment, by performing a flushing operation on the directional main borehole 51 and multiple branch boreholes 52, the coal and rock debris generated during construction are flushed out, and the drilling debris remaining on the borehole wall and bottom is removed. This ensures that the extraction pipe 71 and each observation pipe 72 can be smoothly placed in the corresponding borehole, avoiding the accumulation of coal and rock debris that could cause local blockage of the gas flow channel, or uneven sealing surfaces of the main borehole sealing device 30 and multiple branch borehole sealing devices 40. This ensures the accuracy and reliability of the detection data of the first detection component 10, while also ensuring the detection accuracy and reliability of multiple second detection components 20, providing a reliable data basis for the accurate analysis of the gas distribution characteristics in different sections of the coal seam.

[0068] like Figures 1 to 4 As shown, an embodiment of the present invention also provides a testing device. The testing device adopts the above-mentioned method for testing the multi-parameter attenuation trend of gas in directional drilling along coal seams. The testing device includes a first detection component 10, multiple second detection components 20, a main hole sealing device 30, and multiple branch hole sealing devices 40. The first detection component 10 is used to detect the gas parameters at the opening of the directional main hole 51. Each second detection component 20 is used to detect the gas parameters in a corresponding branch hole 52. The main hole sealing device 30 is used to seal the directional main hole 51, and each branch hole sealing device 40 is used to seal a corresponding branch hole 52.

[0069] This setup ensures that the gas environment at each test point in the main directional borehole 51 and multiple branch boreholes 52 is not disturbed by external factors, thereby enabling accurate measurement of gas parameters within different length ranges of the directional borehole along the coal seam. This improves the efficiency of analyzing the attenuation trend of extraction negative pressure, flow distribution law, and changes in gas concentration gradient, providing reliable data support for optimizing borehole layout and extraction parameters.

[0070] Optionally, the diameter of the main directional hole 51 is 75mm-113mm, and the diameter of each branch hole 52 is the same as that of the main directional hole 51.

[0071] Setting the diameter of the directional main hole 51 to 75mm-113mm ensures the smoothness and stability of gas extraction, reduces the difficulty of sealing the hole, improves the sealing performance of the directional main hole 51 and multiple branch holes 52, prevents gas leakage or gas extraction blockage, and the diameter of each branch hole 52 is the same as that of the directional main hole 51, which helps to ensure that the gas environment at the corresponding position of each branch hole 52 and the directional main hole 51 is consistent, thus improving the accuracy of gas parameter measurement.

[0072] Optionally, each branch hole 52 includes a connection port 521 and an observation port 522, with a spacing of 100m between two adjacent observation ports 522.

[0073] Setting the spacing between two adjacent observation ports 522 to 100m ensures a reasonable interval between each branch port 52, improves detection efficiency and accuracy, and avoids incomplete data and incomplete detection due to excessive spacing, or excessively small spacing that results in too little difference between data, thereby increasing unnecessary detection time costs.

[0074] like Figure 2 As shown, the main hole sealing device 30 includes a first inflation conduit 31, a first booster pump 32, multiple main hole bags 33, and multiple main hole pressure sensors 34. The multiple main hole bags 33 are disposed in the gap between the directional main hole 51 and the extraction pipe 71. One end of the first inflation conduit 31 is connected to the first booster pump 32, and the other end of the first inflation conduit 31 is connected to the multiple main hole bags 33. The first booster pump 32 is disposed in the extraction pipe 63 and is located at the intersection of the extraction pipe 63 and the directional main hole 51. Each main hole pressure sensor 34 is disposed in one main hole bag 33.

[0075] In this embodiment, each main bore pressure sensor 34 is respectively installed in a main bore bag 33, so that each main bore pressure sensor 34 can directly sense the real-time internal pressure of the corresponding main bore bag 33. Combined with the first booster pump 32, the inflation pressure can be adjusted through the first inflation conduit 31 to achieve precise control of the pressure in multiple main bore bags 33. This avoids sealing failure caused by insufficient pressure or overload in local bags, thereby ensuring the airtightness of the directional main bore 51, eliminating test interference caused by sealing leakage, and improving the accuracy and reliability of gas parameter detection.

[0076] like Figure 2 As shown, the first detection component 10 includes a main borehole controller 11 and a comprehensive data acquisition unit 12. The main borehole controller 11 is located in the extraction pipeline 63, and the comprehensive data acquisition unit 12 is located at the end of the extraction pipe 71 and in the extraction pipeline 63. The comprehensive data acquisition unit 12, the first booster pump 32, and multiple main borehole pressure sensors 34 are all electrically connected to the main borehole controller 11. The comprehensive data acquisition unit 12 is used to detect the gas flow rate, pressure, and concentration parameters at the orifice of the directional main borehole 51.

[0077] In this embodiment, the integrated data acquisition unit 12 is used to detect the gas flow rate, pressure, and concentration parameters at the orifice of the directional main borehole 51. The integrated data acquisition unit 12, the first booster pump 32, and multiple main borehole pressure sensors 34 are all electrically connected to the main borehole controller 11, realizing centralized analysis and coordinated control of the gas parameters and sealing status at the orifice of the directional main borehole 51. This solves the problem of dispersed drilling gas parameter detection equipment in traditional technologies, as well as the problems of delayed feedback and failure to adjust the sealing status in a timely manner. Based on the pressure information fed back by the main borehole pressure sensors 34, the main borehole controller 11 starts and stops the first booster pump 32 and dynamically adjusts its output pressure, ensuring the sealing performance and gas extraction efficiency of the directional main borehole 51.

[0078] like Figure 3 As shown, each branch hole sealing device 40 includes a second inflation conduit 41, a second booster pump 42, multiple branch hole bags 43, and multiple branch hole pressure sensors 44. The multiple branch hole bags 43 are disposed in the gap between each branch hole 52 and the corresponding observation tube 72. In each branch hole 52, one end of the second inflation conduit 41 is connected to the second booster pump 42, and the other end of the second inflation conduit 41 is connected to the multiple branch hole bags 43. The second booster pump 42 is disposed in the transport tunnel 62 and is located at the intersection of the branch hole 52 and the transport tunnel 62. Each branch hole pressure sensor 44 is disposed in one branch hole bag 43.

[0079] In this embodiment, each branch hole pressure sensor 44 is respectively installed in a branch hole bag 43, so that each branch hole pressure sensor 44 can directly sense the real-time internal pressure of the corresponding branch hole bag 43. Combined with the setting of the second booster pump 42, the inflation pressure can be adjusted through the second inflation conduit 41 to achieve precise control of the pressure in multiple branch hole bags 43. This avoids the failure of the sealing due to insufficient pressure or overload of local bags, thereby ensuring the airtightness of multiple branch holes 52, eliminating test interference caused by sealing leakage, and improving the accuracy and reliability of gas parameter detection.

[0080] like Figure 3 As shown, each second detection component 20 includes a branch hole controller 21 and a pressure collector 22. The branch hole controller 21 is located in the transport tunnel 62, and the pressure collector 22 is located at the end of the observation tube 72 and in the transport tunnel 62. The second booster pump 42, the branch hole pressure sensor 44, and the pressure collector 22 in each branch hole sealing device 40 are all electrically connected to the branch hole controller 21. Each pressure collector 22 is used to detect the gas pressure in the corresponding branch hole 52.

[0081] In this embodiment, each pressure collector 22 is used to detect the gas pressure in the corresponding branch hole 52. The second booster pump 42, the branch hole pressure sensor 44, and the pressure collector 22 in each branch hole sealing device 40 are all electrically connected to the branch hole controller 21. This enables centralized analysis and coordinated control of the gas parameters and sealing status of each branch hole 52, solving the problems of delayed feedback and failure to adjust the sealing status of coal seam boreholes in traditional technologies. Based on the pressure information fed back by the branch hole pressure sensor 44, the branch hole controller 21 starts and stops the second booster pump 42 and dynamically adjusts its output pressure, ensuring the sealing performance and gas extraction efficiency of each branch hole 52. This improves the ability of the detection device to analyze and control the sealing performance and gas parameter status of coal seam boreholes at different depths.

[0082] like Figure 3 As shown, each second detection component 20 also includes a flow collector 23 and a concentration collector 24. In each branch hole 52, the concentration collector 24 is disposed at one end of the observation tube 72 near the directional main hole 51. Multiple branch hole bags 43 are located between the pressure collector 22 and the flow collector 23. Both the flow collector 23 and the concentration collector 24 are electrically connected to the corresponding branch hole controller 21. The flow collector 23 is used to detect the gas flow rate in the corresponding branch hole 52, and the concentration collector 24 is used to detect the gas concentration in the corresponding branch hole 52.

[0083] In this embodiment, the flow rate collector 23 is used to measure the gas flow rate in the corresponding branch hole 52, and the concentration collector 24 is used to detect the gas concentration in the corresponding branch hole 52. Both are electrically connected to the corresponding branch hole controller 21, and can simultaneously transmit the gas flow rate and gas concentration parameters in the same branch hole 52 to the corresponding branch hole controller 21 for processing and analysis. Multiple branch hole bags 43 are located between the pressure collector 22 and the flow rate collector 23, ensuring the stability and uniformity of the gas in the area measured by the flow rate collector 23 and the concentration collector 24, which helps to accurately reflect the gas parameters at different depths of each branch hole 52.

[0084] like Figure 3 As shown, each flow collector 23 also includes a flow sensor 231 and a flow conduit 232. The flow conduit 232 is disposed inside the observation tube 72, and the diameter of the flow conduit 232 is smaller than the diameter of the corresponding observation tube 72. The flow sensor 231 is disposed on the side wall of the observation tube 72 and connected to the flow conduit 232. The flow sensor 231 is used to detect the gas flow rate inside the flow conduit 232.

[0085] In this embodiment, by setting a flow conduit 232, and the diameter of the flow conduit 232 is smaller than the diameter of the observation tube 72, the mainstream gas flow in the observation tube 72 is physically isolated from the sampling gas flow in the flow conduit 232, avoiding interference from turbulence and disturbance at the tube wall of the observation tube 72 on the flow measurement, and ensuring the stability of the gas flow and the reliability of the parameter measurement.

[0086] The flow sensor 231 is installed on the side wall of the observation tube 72 and connected to the flow conduit 232, ensuring that the detection data of the flow sensor 231 comes only from the stable local airflow, thereby improving the accuracy and stability of gas flow detection at various depths in the coal seam borehole, avoiding measurement errors caused by uneven airflow or backflow in the observation tube 72, and realizing accurate detection of gas flow at different depths in directional boreholes along the coal seam.

[0087] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0088] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0089] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for testing the multi-parameter attenuation trend of gas in directional boreholes along coal seams, characterized in that, include: S1. Construct the directional main shaft (51) between the return airway (61) and the transport roadway (62) along the coal seam. S2. Multiple branch holes (52) are constructed at intervals along the coal seam. One end of each branch hole (52) is connected to the directional main hole (51), and the other end is connected to the return airway (61). S3. A sampling pipe (71) is laid in the main directional hole (51). One end of the sampling pipe (71) is connected to the sampling pipeline (63). An observation pipe (72) is laid in each branch hole (52). One end of each observation pipe (72) is located at the intersection of the branch hole (52) and the return airway (61). The gas environment and gas parameters in the sampling pipe (71) are the same as those in the main directional hole (51). The gas environment and gas parameters in each observation pipe (72) are the same as those in the corresponding branch hole (52). S4. Set a first detection component (10) and a plurality of second detection components (20). The first detection component (10) is used to detect the gas parameters at the opening of the main directional hole (51). Each second detection component (20) is used to detect the gas parameters in a corresponding branch hole (52). S5. The main hole sealing device (30) is used to seal the directional main hole (51), and the multiple branch hole sealing devices (40) are used to seal each branch hole (52) respectively. S6. Analyze the gas distribution characteristics at different lengths along the coal seam using the gas parameters detected by the first detection component (10) and the second detection component (20).

2. The method for testing the multi-parameter attenuation trend of gas in directional boreholes along coal seams according to claim 1, characterized in that, The S4 further includes: installing multiple transmission cables (73) in the directional main hole (51) and multiple branch holes (52) respectively, connecting the main hole sealing device (30) to the main hole controller (11) through the multiple transmission cables (73), and connecting the multiple branch hole sealing devices (40) to the multiple branch hole controllers (21) one by one through the multiple transmission cables (73).

3. The method for testing the multi-parameter attenuation trend of gas in directional drilling along coal seams according to claim 2, characterized in that, The first detection component (10) is connected to the main hole controller (11) through multiple transmission cables (73), and multiple second detection components (20) are connected to multiple branch hole controllers (21) one by one through multiple transmission cables (73). The gas flow rate, gas concentration and gas pressure at different lengths along the coal seam are measured through the first detection component (10) and multiple second detection components (20).

4. The method for testing the multi-parameter attenuation trend of gas in directional drilling along coal seams according to claim 1, characterized in that, S5 further includes: after the initial sealing of the directional main hole (51) and the multiple branch holes (52), connecting the directional main hole (51) to the gas extraction pump (74).

5. The method for testing the multi-parameter attenuation trend of gas in directional drilling along coal seams according to claim 1, characterized in that, In S6, the first detection component (10) and multiple second detection components (20) are connected to a multi-parameter acquisition and control device (75) installed 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 components (20), analyzes the gas distribution characteristics at different depths of the directional borehole along the coal seam through data analysis of different extraction durations, adjusts the borehole distribution and borehole extraction pressure, and optimizes the gas extraction parameters of the directional borehole.

6. The method for testing the multi-parameter attenuation trend of gas in directional boreholes along coal seams according to claim 1, characterized in that, Between S2 and S3, the process also includes: performing a hole-washing operation on the completed directional main hole (51) and multiple branch holes (52) to flush out the coal dust and rock debris generated during the construction process.

7. A testing apparatus, characterized in that, The testing device adopts the gas multi-parameter attenuation trend testing method of directional drilling along coal seam as described in any one of claims 1 to 6. The testing device includes 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 to detect the gas parameters at the orifice of the directional main hole (51). Each second detection component (20) is used to detect the gas parameters in a corresponding branch hole (52). The main hole sealing device (30) is used to seal the directional main hole (51). Each branch hole sealing device (40) is used to seal a corresponding branch hole (52).

8. The testing apparatus according to claim 7, characterized in that, The main hole sealing device (30) includes a first inflation conduit (31), a first booster pump (32), multiple main hole bags (33) and multiple main hole pressure sensors (34). The multiple main hole bags (33) are disposed in the gap between the directional main hole (51) and the extraction pipe (71). One end of the first inflation conduit (31) is connected to the first booster pump (32), and the other end of the first inflation conduit (31) is connected to the multiple main hole bags (33). The first booster pump (32) is disposed in the extraction pipeline (63) and located at the intersection of the extraction pipeline (63) and the directional main hole (51). Each main hole pressure sensor (34) is disposed in one of the main hole bags (33).

9. The testing apparatus according to claim 8, characterized in that, The first detection component (10) includes a main hole controller (11) and a comprehensive collector (12). The main hole controller (11) is located 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 a plurality of the main hole pressure sensors (34) are all electrically connected to the main hole controller (11). The comprehensive collector (12) is used to detect the gas flow rate, pressure and concentration parameters at the orifice of the directional main hole (51).

10. The testing apparatus according to claim 7, characterized in that, Each branch hole sealing device (40) includes a second inflation conduit (41), a second booster pump (42), multiple branch hole bags (43), and multiple branch hole pressure sensors (44). The multiple branch hole bags (43) are disposed in the gap between each branch hole (52) and the corresponding observation tube (72). In each branch hole (52), one end of the second inflation conduit (41) is connected to the second booster pump (42), and the other end of the second inflation conduit (41) is connected to the multiple branch hole bags (43). The second booster pump (42) is disposed in the transport tunnel (62) and located at the intersection of the branch hole (52) and the transport tunnel (62). Each branch hole pressure sensor (44) is disposed in one of the branch hole bags (43).

11. The testing apparatus according to claim 10, characterized in that, Each of the second detection components (20) includes a branch hole controller (21) and a pressure collector (22). The branch hole controller (21) is located in the transport tunnel (62), and the pressure collector (22) is located at the end of the observation tube (72) and in the transport tunnel (62). The second booster pump (42), the branch hole pressure sensor (44), and the pressure collector (22) in each branch hole sealing device (40) are all electrically connected to the branch hole controller (21). Each pressure collector (22) is used to detect the gas pressure in the corresponding branch hole (52).

12. The testing apparatus according to claim 11, characterized in that, Each of the second detection components (20) further includes a flow collector (23) and a concentration collector (24). In each of the branch holes (52), the concentration collector (24) is disposed at one end of the observation tube (72) near the directional main hole (51). A plurality of branch hole bags (43) are located between the pressure collector (22) and the flow collector (23). The flow collector (23) and the concentration collector (24) are both electrically connected to the corresponding branch hole controller (21). The flow collector (23) is used to detect the gas flow rate in the corresponding branch hole (52), and the concentration collector (24) is used to detect the gas concentration in the corresponding branch hole (52).

13. The testing apparatus according to claim 12, characterized in that, Each of the flow collectors (23) further includes a flow sensor (231) and a flow conduit (232). The flow conduit (232) is disposed inside the observation tube (72), and the diameter of the flow conduit (232) is smaller than the diameter of the corresponding observation tube (72). The flow sensor (231) is disposed on the side wall of the observation tube (72) and connected to the flow conduit (232). The flow sensor (231) is used to detect the gas flow rate in the flow conduit (232).

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