In-situ closed coring gas content continuous multi-point intelligent accurate measurement method

Abstract

The invention discloses an in-situ closed coring gas content continuous multi-point intelligent accurate measurement method. The method includes the following steps. Assembly of in-situ closed coring gas content continuous multi-point intelligent accurate measurement system-> gas supply-> water supply-> drilling operation-> gas supply-> water supply-> coring operation-> gas stop-> water stop-> coal sample sealing-> coal sample quality measurement-> gas content measurement before coal sample crushing-> gas content measurement after crushing-> gas content Q calculation-> gas supply and water supply again-> The method comprises the following steps: crushing coal samples, removing slag, blowing the crushed coal samples out of an intelligent accurate measurement system, completing one-time coring, continuously drilling, and repeatedly carrying out the second step to the ninth step, so as to realize continuous multi-point intelligent accurate measurement of the in-situ closed coring gas content. The method is scientific in principle, continuous closed coring can be achieved, the coal seam multi-point gas content can be continuously measured, the gas content in-situ measurement precision is improved, the gas loss amount generated in the repeated drill retreating-drill feeding process is reduced, the gas content measurement period is shortened, and the operation efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of coal seam gas parameter measurement technology, specifically involving an intelligent and precise method for continuous multi-point measurement of gas content using in-situ closed core sampling. Background Technology

[0002] Accurate determination of gas content is crucial for ensuring the accuracy of gas extraction compliance assessments and the verification of gas outburst prevention measures. Currently, sampling with a core tube open at one end results in significant gas loss, leading to inaccurate gas content readings. While published patents report the use of closed-loop core sampling devices to reduce errors in gas content determination, this method is complex. Each core sample requires the sampling device to be removed from the borehole for on-site and laboratory desorption, resulting in low sampling efficiency and a long measurement cycle. Therefore, a new method and technology are needed that enables continuous closed-loop core sampling and in-situ gas content determination. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this invention provides an in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content without retracting the drill after core sampling. This method allows for continuous core sampling of coal samples at different depths within a single borehole, resulting in high testing efficiency and data accuracy.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for continuous multi-point intelligent precision measurement of gas content in in-situ sealed core sampling, comprising the following steps: The first step is to assemble the in-situ closed core sampling gas content continuous multi-point intelligent precision measurement system, hereinafter referred to as the intelligent precision measurement system. The second step is to operate the drilling rig to drive the intelligent precision measurement system to carry out the air-no-water-drilling operation. Step 3: Control the drilling rig to drive the intelligent precision measurement system to carry out the gas-water-coring operation: Step 4: Control the drilling rig to drive the intelligent precision testing system to shut off gas and water supply and seal the coal sample. Step 5: Coal sample quality determination; Step 6: Determination of gas content in coal samples before crushing; Step 7: Determination of gas content after coal sample crushing; Step 8: Gas Content Q calculate; Step 9: Resupply gas and water - clean slag, blow the broken coal sample out of the intelligent precision testing system to complete one core sampling; Step 10: Continuous measurement of gas content in in-situ sealed coring: According to the set position of the coring point, start the drilling rig to drive the intelligent precision measurement system to continuously drill to the next coring position under the condition of only supplying gas and not water; then, repeat steps 2 to 9 to achieve continuous multi-point intelligent precision measurement of gas content in in-situ sealed coring.

[0005] Furthermore, the intelligent precision measurement system includes a computer 40 and a drill bit 50, a core sampling device 60, an adapter 23, several drill rod assemblies 70, and a water-air-electric three-channel drill tail assembly 30 connected in series from front to back. The core sampling device 60 includes a core sampling tube 1, a ball valve sealing assembly, a block crushing-weighing assembly, a hydraulic drive assembly, and an intelligent control-gas measuring assembly; the outer circumference of the core sampling tube 1 is provided with a spiral groove 101; The ball valve sealing assembly is located inside the front side of the core tube 1. Several elongated airflow holes 102 are provided along the length of the core tube 1. The front end of each elongated airflow hole 102 communicates with the outside of the core tube 1, and the rear end communicates with the inside of the core tube 1. The ball valve sealing assembly, the block crushing-weighing assembly, and the intelligent control-gas measuring assembly are sequentially arranged inside the core tube 1 from front to back. The hydraulic drive assembly is located inside the core tube 1 and outside the block crushing-weighing assembly. The hydraulic drive assembly extends forward to drive the ball valve sealing assembly to open. A water pipe 15 passing through the drill pipe assembly 70 is connected to the rear end of the hydraulic drive assembly. The crushing-weighing component transmits the collected signals to the intelligent control-gas measuring component. The intelligent control-gas measuring component accurately measures the coal sample mass and gas desorption amount inside the crushing-weighing component. The intelligent control-gas measuring component transmits data bidirectionally with the computer 40 outside the borehole. The high-pressure airflow introduced through the water-gas-electric three-channel drill tail assembly 30 is divided into three paths. The first high-pressure airflow is used to discharge slag outward during drilling and coring through the airflow elongated hole 102. The second high-pressure airflow provides driving power for the crushing-weighing component. The third path is used to clean the coal sample inside the crushing-weighing component after testing. The ball valve sealing assembly includes a pressure block 2, a ball valve core 5, and a ball core base 8 arranged sequentially from front to back. The outer circle of the pressure block 2 is connected to the inner circle of the core extraction tube 1 via a thread 203. The outer surface of the pressure block 2 has 1 to 5 first annular grooves 202. A first O-ring 3 that seals with the inner circle of the core extraction tube 1 is installed in the first annular groove 202. The front end surface of the pressure block 2 has four disassembly holes 201. The outer circle of the ball core base 8 has multiple first screw fixing holes 803. The core extraction tube 1 has first screws extending into the first screw fixing holes 803 to fix the ball core base 8. Both the pressure block 2 and the ball core base 8 have through-holes. The rear end of the inner hole of the pressure block 2 and the front end of the inner hole of the ball core base 8 are provided with stepped grooves 801. A polytetrafluoroethylene gasket 4 is installed in each of the two opposing stepped grooves 801. The ball valve core 5 is provided with... The spherical valve core 5 is placed between two polytetrafluoroethylene gaskets 4. Both sides of the spherical valve core 5 are circular planar structures that are symmetrical about the center. A positioning sleeve 503 is fixed at the center of each of the two circular planar structures. The core tube 1 is provided with a pin screw that extends into the positioning sleeve 503 along the radial thread. A rotating wing plate 502 is fixed on each of the two circular planar structures. Each rotating wing plate 502 passes through the center of the circular planar structure on the same side. The two rotating wing plates 502 have the same structure and are symmetrical about the center of the spherical valve core 5. A tension spring 6 is provided between the front side of one end of the rotating wing plate 502 and the rear end face of the pressure block 2. Two guide holes 802 that are open from front to back are opened in the spherical core base 8. Each guide hole 802 corresponds to the rear side of the other end of the rotating wing plate 502. A through injection hole 501 is opened in the spherical valve core 5. The center line of the injection hole 501 is perpendicular to the center line of the positioning sleeve 503. The block crushing-weighing assembly includes a crushing and storage tank 9, a fixed block 11, a pneumatic motor 12, two weighing sensors 35, and an auxiliary fixing body 10; The crushed sample storage container 9 has a cylindrical structure with an open front end. The inner wall of the crushed sample storage container 9 is tightly covered with breathable yarn. The inner wall of the crushed sample storage container 9 has several barbs 901 that pierce the breathable yarn. The crushed sample storage container 9 has several breathable holes 902. The rear center of the crushed sample storage container 9 has a central connecting hole 903. The weighing sensor 35 and the auxiliary fixing body 10 are both annular. The two weighing sensors 35 are respectively fitted at the front and rear ends of the crushed sample storage container 9. The fixing block 11 is located at the rear of the crushed sample storage tank 9. The fixing block 11 is a cylindrical structure with an open rear end. The outer circle of the fixing block 11 and the outer circle of the auxiliary fixing body 10 are both fixed to the core tube 1 by radially arranged countersunk screws 24 and washers 25. The inner end of the countersunk screw 24 is threadedly connected to the threaded hole 1106 provided on the fixing block 11. The outer surface of the fixing block 11 is provided with a second annular groove 1109 for installing an O-ring seal. The front end face of the fixing block 11 is open at both ends. The fixed block 11 has a shaft hole 1101, two rod holes 1102, a first wire hole 1103, an air outlet 1104 and an exhaust port 1105. An air inlet 1108 is provided on the fixed block 11, located behind the second annular groove 1109. The number of air inlets 1108 and the airflow elongated holes 102 are equal and they are connected to each other. A water inlet 1107 is provided on the inner wall of the fixed block 11, which is connected to the rear end of the two rod holes 1102. The water inlet 1107 at the front end of the water pipe 15 is connected to the water pipe 15. The rear weighing sensor 35 is fixedly connected to the rear side of the auxiliary fixing body 10, and the front weighing sensor 35 is fixedly connected to the rear side of the ball core base 8; the pneumatic motor 12 is set inside the fixing block 11, and the drive shaft of the pneumatic motor 12 passes forward through the through shaft hole 1101 and extends into the central connecting hole 903 and drives and seals with the crushed sample storage tank 9; the front end face of the pneumatic motor 12 is strictly sealed with the rear end face of the inner side of the fixing block 11.

[0006] The hydraulic drive assembly includes two hydraulic telescopic rods 7, both parallel to the center line of the core tube 1. Each hydraulic telescopic rod 7 includes a piston 701, a movable rod 702, and a fixed tube 703. The rear end of each fixed tube 703 passes through and is fixedly connected to the rod hole 1102. The fixed tube 703 passes through the auxiliary fixing body 10. The front end of each movable rod 702 passes through a guide hole 802 and contacts the rear side of a rotating wing plate 502. The rear end of each movable rod passes through the fixed tube 703. The piston 701 is slidably disposed in the fixed tube and fixedly connected to the rear end of the movable rod 702. The intelligent control-gas measurement component includes a gas supply sub-component, a gas measurement sub-component, and an electrical control sub-component; The air supply sub-assembly includes a main air supply pipe 13 and a one-in-three-out solenoid valve 17. The outlet of the main air supply pipe 13 is connected to the inlet of the one-in-three-out solenoid valve 17. The three outlets of the one-in-three-out solenoid valve 17 are respectively connected to a motor air supply pipe 1301, a drilling slag discharge air supply pipe 1302, and a tank cleaning air supply pipe 1303. The outlet of the motor air supply pipe 1301 is connected to the inlet of the pneumatic motor 12. The outlet of the drilling slag discharge air supply pipe 1302 is connected to the air inlet hole 1108 on the fixing block 11. The outlet of the tank cleaning air supply pipe 1303 is connected to the air outlet 1104 on the fixing block 11. The exhaust component includes a motor exhaust pipe 1401, a content testing tube 1402, and a Y-type quick-connect fitting 22. A flow meter 18, a pressure sensor 19, and a solenoid valve 20 are sequentially installed on the content testing tube 1402 along the airflow direction. The inlet of the motor exhaust pipe 1401 is connected to the outlet of the pneumatic motor 12, and the inlet of the content testing tube 1402 is connected to the exhaust port 1105 on the fixing block 11. The outlets of the motor exhaust pipe 1401 and the content testing tube 1402 are respectively inserted into ports A and B of the Y-type quick-connect fitting 22. The electronic control sub-assembly includes a main wire 16, a microcontroller module 21, and a series of branch wires 1601~1605. The main wire 16 is connected to the microcontroller module 21 for power supply and signal transmission. The signal output terminal of the microcontroller module 21 outputs five branch wires, which are: the first branch wire 1601 connected to the one-in-three-out solenoid valve 17, the second branch wire 1602 connected to the one-in-one-out solenoid valve 20, the third branch wire 1603 connected to the pressure sensor 19, the fourth branch wire 1604 connected to the flow meter 18, and the fifth branch wire 1605 connected to the weighing sensor 35. The fifth branch wire 1605 passes through the first wire through hole 1103 on the fixing block 11 and is connected to the two weighing sensors 35. The air inlet of the cleaning tank air supply pipe 1303 and the air outlet 1104 of the fixing block 11, the air inlet of the content test pipe 1402 and the exhaust port 1105 of the fixing block 11, the fifth branch wire 1605 and the first wire through hole 1103 on the fixing block 11, and all other pipelines and corresponding holes of the fixing block 11 are sealed by adhesive or welding. The inner circle of the rear end of the adapter 23 is provided with an internal thread 2301 for connecting to the drill rod assembly 70. A partition 2302 is provided in the middle of the interior of the adapter 23. The front end of the adapter 23 is inserted into the rear port of the core tube 1 and fixedly connected to the core tube 1 by a second screw. The outer circle of the front end of the adapter 23 is provided with two third annular grooves 2305 for installing a sealing ring and a second screw fixing hole 2306 for threaded connection of the second screw. The center of the partition 2302 is provided with a first water pipe through hole 2303 and an air pipe through hole 2307 and a first wire through hole 2308 surrounding the first water pipe through hole 2303. The adapter 23 is provided with an exhaust hole 2304 located in front of the partition 2302 along the radial direction. The outlet end of the Y-type quick connector 22 is inserted into the exhaust hole 2304. The rear end of the main air supply pipe 13 is connected to the air pipe through hole 2307. The rear end of the main wire 16 passes through the first wire through hole 2308. The water pipe 15 passes through the first water pipe through hole 2303. The drill rod assembly 70 includes a first drill rod 26 and several subsequent drill rods 37. The front end of the first drill rod 26 is connected to the rear end of the adapter 23 by a threaded connection. The first drill rod 26 includes a drill rod body 2603. A partition vent plate 27 is fixed on the front and rear sides of the inner wall of the drill rod body 2603, respectively. The partition vent plate 27 is provided with a second wire through hole 2701 and a second water pipe through hole 2702. The water pipe 15 and the main wire 16 inside the drill rod body 2603 pass through the second water pipe through hole 2702 and the second wire through hole 2701 on the two partition vent plates 27, respectively. The water pipe 15 consists of several sections and is connected by a bidirectional quick connector 28. The main wire 16 consists of several sections and is connected by a mating aviation connector 29. The water-air-electric three-channel drill tail assembly 30 includes a fixed part 3002 at the rear end and a rotating part 3001 at the front end, which are coaxially arranged. The outer circle at the front end of the fixed part 3002 and the inner circle at the rear end of the rotating part 3001 are rotatably connected by a bearing 3004. The outer circle on the right side of the rotating part 3001 has a third screw fixing hole 3003 for assembly with the subsequent drill rod 37. The structure of the subsequent drill rod 37 is basically the same as that of the first drill rod 26. The difference is that the front end of the drill rod is not threaded, but has a pin hole. On this basis, the two adjacent subsequent drill rods 37, the first subsequent drill rod 37 and the first drill rod 26, and the last subsequent drill rod 37 and the drill tail body 30 are all inserted and fixedly connected by radially arranged third screws and washers. The inner wall of the rotating part 3001 is provided with a first support frame 31, and the inner wall of the fixed part 3002 is provided with a second support frame 32. The first support frame 31 has a mounting hole in the center, and a sealing rotary joint 3103 is provided in the mounting hole. The fixed interface at the front end of the sealing rotary joint 3103 is connected to a rotating water guide pipe 3101. The front end of the rotating water guide pipe 3101 is connected to the rear end of the water pipe 15 through a bidirectional quick connector 28. The rotating interface at the rear end of the sealing rotary joint 3103 is connected to an L-shaped water injection pipe 3102. The L-shaped water injection pipe 3102 and the sealing rotary joint 3103 are sealed and rotate relative to each other. The rear end of the L-shaped water injection pipe 3102 passes through the second support frame 32 and out of the fixed part 3002 to connect to the underground water pipe in the coal mine. A valve is provided on the L-shaped water injection pipe 3102. The second support frame 32 is a composite metal part. An external wire 36 that passes through the fixing part 3002 is connected to the left side surface of the second support frame 32. The front end of the main wire 16 passes through the first support frame 31 and is connected to the brush 33. The rear end of the brush 33 contacts the front surface of the second support frame 32. When the drill rod 37 rotates, it drives the rotating part 3001, the rotating water guide pipe 3101, the second support frame 32, the sealing rotary joint 3103 and the brush 33 to rotate. The left end of the brush 33 slides against the second support frame 32 and conducts electricity and transmits signals.

[0007] Furthermore, the specific implementation process of the second step is as follows: Under the condition of gas supply only and no water supply, the drilling rig drives the drill rod assembly 70. The rotational power is sequentially transmitted through the adapter 23 and the core sampling device 60 to drive the drill bit 50 to drill into the coal seam to the designated core sampling depth. During this process, the spherical valve core 5 seals the channel between the pressure block 2 and the spherical core base 8. High-pressure gas enters from the drill tail port 34 → the gas flows through the subsequent drill rod 37 and the first drill rod 26 → through the gas pipe perforation 23 on the inner partition 2302 of the adapter 23. 07 The main air inlet pipe 13 enters the core sampling device 60 → flows through the one-in-three-out solenoid valve 17. The computer 40 controls the one-in-three-out solenoid valve 17 to open through the microcontroller module 21, controlling the high-pressure gas to flow into the drilling and slag discharge air supply pipe 1302 → enters the air flow elongated hole 102 in the pipe wall of the core sampling pipe 1 through the air inlet hole 1108 set on the fixed block 11. Finally, the air flow is discharged from the front port 103 of the air flow elongated hole 102. The high-pressure air flow drives the coal slag in the borehole to be transported backward, exerting its drilling and slag discharge efficiency.

[0008] Furthermore, the specific implementation process of the third step is as follows: After the coring device 60 is sent into the designated position in the borehole, the data of the weighing sensor 35 is zeroed. Through the water-air-electric three-channel drill tail assembly 30, air and water are supplied to the coring device 60 simultaneously and continuously. The water flows through the water pipe 15 into the water inlet 1107, and then into the fixed pipe 703 to drive the piston 701 to move forward. The movable rod 702 moves forward under the push of the piston 701. The two movable rods 702 simultaneously push the corresponding rotating blade 502. The rotating blade 502 drives the ball valve core 5 to rotate around the positioning sleeve 503 as the center line. After the ball valve core 5 rotates 90°, the front and rear ports of the sample inlet 501 are connected to the inner holes of the pressure block 2 and the ball core base 8, respectively. Then the valve on the L-shaped water injection pipe 3102 is closed, so that the piston 701 remains stationary in the fixed pipe 703. At this time, the tension spring 6 is in a stretched state. Then, the drilling rig is turned on, and the coring device 60 and the drill bit 50 are driven to rotate and cored. The coal core passes through the inner hole of the drill bit 50 in sequence through the pressure block 2, the sampling hole 501 of the ball valve core 5, and the ball core base 8, and then enters the crushed sample storage tank 9. During the coring process, high-pressure gas enters from the drill tail port 34 → the gas flows through the subsequent drill rod 37 and the first drill rod 26 → through the gas pipe perforation 2307 on the inner partition 2302 of the adapter 23 and enters the main air inlet pipe 13 in the coring device 60 → flows through the one-in-three-out solenoid valve 17. The computer 40 controls the one-in-three-out solenoid valve 17 to open through the single-chip microcomputer module 21, controlling the high-pressure gas to flow into the drilling slag discharge gas supply pipe 1302 → through the air inlet hole 1108 set on the fixed block 11 and enters the air flow elongated hole 102 in the pipe wall of the coring tube 1. Finally, the air flow is discharged from the front port 103 of the air flow elongated hole 102, and the high-pressure air flow drives the coal slag in the borehole to be transported backward.

[0009] Furthermore, the specific implementation process of the fourth step is as follows: stop gas - stop water - seal the ball valve core 5: stop the drilling rig rotation, stop the water supply, open the valve on the L-shaped water injection pipe 3102, and after the water pressure is lost, the ball valve core 5 rotates in the opposite direction under the tension of the tension spring 6, causing the sample inlet 501 to close, thereby achieving the sealing of the crushed sample storage tank 9; at the same time, under the reverse rotation of the rotating wing plate 502, the piston 701 and the movable rod 702 retract to their original positions.

[0010] Furthermore, the specific implementation process of the fifth step is as follows: after the front port of the crushed sample storage tank 9 is sealed by the ball valve core 5, the readings are obtained through two weighing sensors 35. F The values ​​are then transmitted to computer 40. For horizontal boreholes, the coal core mass m is denoted as... F / 9.81, for an inclination angle of a For borehole drilling, the coal core mass m is denoted as... F / (9.81*cos a ).

[0011] Furthermore, the specific implementation process of the sixth step is as follows: After the sealed ball valve core 5 seals the crushed sample storage tank 9, the computer 40 controls the single-in-three-out solenoid valve 17 to open via the microcontroller module 21, controlling the desorbed gas to flow into the content test tube 1402 through the exhaust port 1105, and then through the flow meter 18, pressure sensor 19, and single-in-one-out solenoid valve 20 before being discharged into the borehole through the Y-type quick connector 22. The measured data is transmitted to the microcontroller module 21 via the main wire 16, and then the data is transmitted to the computer 40 outside the borehole. The cumulative gas flow rate before crushing is recorded as follows. q 1.

[0012] Furthermore, the specific implementation process of the seventh step is as follows: Gas supply continues to the core sampling device 60. Under the control of the single-chip microcomputer module 21 of the computer 40, the gas flow is controlled to pass through the one-in-three-out solenoid valve 17 and distributed to the motor gas supply pipe 1301, thereby driving the drive shaft of the pneumatic motor 12 to rotate, which in turn drives the crushing and storage tank 9 to rotate. Several barbs on the inner wall of the crushing and storage tank 9 cut the internal coal core, crushing it into coal samples. The gas measurement process after crushing is the same as the gas content determination process before crushing in the fifth step. The cumulative gas flow rate after crushing is recorded as follows: q 2; The gas flowing out of the pneumatic motor 12 is discharged into the borehole through the motor exhaust pipe 1401 and the Y-type quick connector 22.

[0013] Furthermore, the specific implementation process of step eight is as follows: gas content Q Calculate: the residual gas content value of the coal seam Q 残余 Write to external computer 40, external computer 40 receives core quality. m Cumulative gas flow rate before crushing q1. Cumulative gas flow rate after crushing q 2. Computer 40 performs data processing, including gas content. Q Calculate using the following formula: Q =( q 1+ q 2) / m+ Q 残余 .

[0014] Furthermore, the specific implementation process of the ninth step is as follows: Water pipe 15 supplies water into the fixed pipe 703, driving piston 701 to move forward. Movable rod 702 moves forward under the push of piston 701. Both movable rods 702 simultaneously push the corresponding rotating vane 502. The rotating vane 502 drives the spherical valve core 5 to rotate around the positioning sleeve 503. After the spherical valve core 5 rotates 90°, the front and rear ends of the injection port 501 are connected to the inner holes of the pressure block 2 and the ball core base 8, respectively. Then, the valve on the L-shaped water injection pipe 3102 is closed. Under the control of the single-chip microcomputer module 21, the one-in-three-out solenoid valve 17 distributes the airflow to the cleaning tank air supply pipe 1303, and enters the core sampling pipe 1 through the air outlet 1104. The airflow enters the crushed sample storage tank 9 through several vent holes 902, and blows the crushed coal sample forward through the ball core base 8, the sample inlet hole 501 of the ball valve core 5, and the pressure block 2 to the drill bit 50. After a period of time, the air and water supply is stopped, and the ball valve core 5 closes the passage between the ball core base 8 and the pressure block 2 again, thus ending the first core sampling.

[0015] Compared with the prior art, the working principle and technical effects of the present invention, using the above technical solution, are as follows: During coring, this invention supplies water and air to the drill rod assembly, adapter, and coring device via a three-channel water-air-electricity drill tail assembly. The hydraulic drive assembly opens the ball valve sealing assembly, allowing the coal core to enter the crushing and storage tank. When the water and air supply are stopped, the ball valve sealing assembly closes under the action of a tension spring. The block crushing-weighing assembly measures the coal sample mass and gas desorption amount, calculating the gas content at the coring location. Then, water and air are supplied again, the valve sealing assembly opens, and high-pressure airflow empties the coal slag from the crushing and storage tank. Next, the water supply stops, the ball valve sealing assembly closes, and drilling continues to the next coring location under air supply conditions, repeating the above coring and content determination operations.

[0016] This invention is based on sound principles and enables continuous coring at multiple locations within the same borehole. Its advantages include: continuous closed-loop coring and continuous measurement of gas content at multiple points in the coal seam; after measuring the gas content at one location, the next location can be measured without retracting the drill bit. This method completely avoids the ineffective auxiliary work of entering and retracting the drill bit during coring, while simultaneously enhancing the timeliness of coring and gas content measurement, improving the accuracy of in-situ gas content measurement, reducing gas loss during repeated retraction and insertion, shortening the gas content measurement cycle, and increasing operational efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the intelligent precision measurement system in this invention; Figure 2 This is an axial cross-sectional view of the core sampling device and the adapter; Figure 3 This is an axial half-sectional view of the core sampling device and the adapter; Figure 4 This is a schematic diagram of the connection structure between the core tube and its internal components via screws and washers. Figure 5 This is an axial cross-sectional view of the core tube; Figure 6 This is a structural diagram of the fixed block; Figure 7 This is an axial cross-sectional view of the ball valve sealing assembly; Figure 8 This is a schematic diagram of the compaction block; Figure 9 This is a schematic diagram of the structure of a ball valve core; Figure 10 This is a schematic diagram of the structure of the spherical core base; Figure 11 This is a schematic diagram of the transmission and cooperation between the hydraulic drive assembly and the ball valve sealing assembly. Figure 12 yes Figure 11 Axial sectional view of a hydraulic telescopic rod; Figure 13 This is a structural schematic diagram of the block crushing-weighing component; Figure 14 This is a schematic diagram of the assembly cross-section of the weighing sensor assembly drawing; Figure 15 This is an axial cross-sectional view of the crushed sample storage container; Figure 16 This is a schematic diagram of the planar structure of the intelligent control-gas measurement component at one angle; Figure 17 This is a schematic diagram of the planar structure of the intelligent control-gas measurement component from another angle; Figure 18This is a three-dimensional structural diagram of the intelligent control-gas measurement component; Figure 19 This is a schematic diagram of the gas supply sub-assembly; Figure 20 This is a schematic diagram of the exhaust component structure; Figure 21 This is a schematic diagram of the electronic control sub-assembly structure; Figure 22 This is a schematic diagram of the adapter structure; Figure 23 This is a schematic diagram of the structure of the breathable separator; Figure 24 This is an axial cross-sectional view of the first drill pipe assembly; Figure 25 This is an axial cross-sectional view of the water-air-electric three-channel drill tail assembly; Figure 26 This is a schematic diagram of the first support frame and its front and rear pipeline connections; Figure 27 This is an axial sectional view of the fixed and rotating parts of the water-air-electric three-channel drill tail assembly. Detailed Implementation

[0018] The following examples provide a further detailed description of the implementation methods of the present invention.

[0019] like Figures 1-27 As shown, the method for continuous multi-point intelligent precision measurement of gas content in in-situ closed core sampling includes the following steps: The first step is to assemble the in-situ closed core sampling gas content continuous multi-point intelligent precision measurement system, hereinafter referred to as the intelligent precision measurement system. The second step is to operate the drilling rig to drive the intelligent precision measurement system to carry out the air-no-water-drilling operation. Step 3: Control the drilling rig to drive the intelligent precision measurement system to carry out the gas-water-coring operation: Step 4: Control the drilling rig to drive the intelligent precision testing system to shut off gas and water supply and seal the coal sample. Step 5: Coal sample quality determination; Step 6: Determination of gas content in coal samples before crushing; Step 7: Determination of gas content after coal sample crushing; Step 8: Gas Content Q calculate; Step 9: Resupply gas and water - clean slag, blow the broken coal sample out of the intelligent precision testing system to complete one core sampling; Step 10: Continuous measurement of gas content in in-situ sealed coring: According to the set position of the coring point, start the drilling rig to drive the intelligent precision measurement system to continuously drill to the next coring position under the condition of only supplying gas and not water; then, repeat steps 2 to 9 to achieve continuous multi-point intelligent precision measurement of gas content in in-situ sealed coring.

[0020] The intelligent precision measurement system includes a computer 40 and a drill bit 50, a core sampling device 60, an adapter 23, several drill rod assemblies 70, and a water-air-electric three-channel drill tail assembly 30, which are connected in series from front to back on the same axis. The core sampling device 60 includes a core sampling tube 1, a ball valve sealing assembly, a block crushing-weighing assembly, a hydraulic drive assembly, and an intelligent control-gas measuring assembly; the outer circumference of the core sampling tube 1 is provided with a spiral groove 101; The ball valve sealing assembly is located inside the front side of the core tube 1. Several elongated airflow holes 102 are provided along the length of the core tube 1. The front end of each elongated airflow hole 102 communicates with the outside of the core tube 1, and the rear end communicates with the inside of the core tube 1. The ball valve sealing assembly, the block crushing-weighing assembly, and the intelligent control-gas measuring assembly are sequentially arranged inside the core tube 1 from front to back. The hydraulic drive assembly is located inside the core tube 1 and outside the block crushing-weighing assembly. The hydraulic drive assembly extends forward to drive the ball valve sealing assembly to open. A water pipe 15 passing through the drill pipe assembly 70 is connected to the rear end of the hydraulic drive assembly. The crushing-weighing component transmits the collected signals to the intelligent control-gas measuring component. The intelligent control-gas measuring component accurately measures the coal sample mass and gas desorption amount inside the crushing-weighing component. The intelligent control-gas measuring component transmits data bidirectionally with the computer 40 outside the borehole. The high-pressure airflow introduced through the water-gas-electric three-channel drill tail assembly 30 is divided into three paths. The first high-pressure airflow is used to discharge slag outward during drilling and coring through the airflow elongated hole 102. The second high-pressure airflow provides driving power for the crushing-weighing component. The third path is used to clean the coal sample inside the crushing-weighing component after testing. The ball valve sealing assembly includes a pressure block 2, a ball valve core 5, and a ball core base 8 arranged sequentially from front to back. The outer circle of the pressure block 2 is connected to the inner circle of the core extraction tube 1 via a thread 203. The outer surface of the pressure block 2 has 1 to 5 first annular grooves 202. A first O-ring 3 that seals with the inner circle of the core extraction tube 1 is installed in the first annular groove 202. The front end surface of the pressure block 2 has four disassembly holes 201. The outer circle of the ball core base 8 has multiple first screw fixing holes 803. The core extraction tube 1 has first screws extending into the first screw fixing holes 803 to fix the ball core base 8. Both the pressure block 2 and the ball core base 8 have through-holes. The rear end of the inner hole of the pressure block 2 and the front end of the inner hole of the ball core base 8 are provided with stepped grooves 801. A polytetrafluoroethylene gasket 4 is installed in each of the two opposing stepped grooves 801. The ball valve core 5 is provided with... The spherical valve core 5 is placed between two polytetrafluoroethylene gaskets 4. Both sides of the spherical valve core 5 are circular planar structures that are symmetrical about the center. A positioning sleeve 503 is fixed at the center of each of the two circular planar structures. The core tube 1 is provided with a pin screw that extends into the positioning sleeve 503 along the radial thread. A rotating wing plate 502 is fixed on each of the two circular planar structures. Each rotating wing plate 502 passes through the center of the circular planar structure on the same side. The two rotating wing plates 502 have the same structure and are symmetrical about the center of the spherical valve core 5. A tension spring 6 is provided between the front side of one end of the rotating wing plate 502 and the rear end face of the pressure block 2. Two guide holes 802 that are open from front to back are opened in the spherical core base 8. Each guide hole 802 corresponds to the rear side of the other end of the rotating wing plate 502. A through injection hole 501 is opened in the spherical valve core 5. The center line of the injection hole 501 is perpendicular to the center line of the positioning sleeve 503. The block crushing-weighing assembly includes a crushing and storage tank 9, a fixed block 11, a pneumatic motor 12, two weighing sensors 35, and an auxiliary fixing body 10; The crushed sample storage container 9 has a cylindrical structure with an open front end. The inner wall of the crushed sample storage container 9 is tightly covered with breathable yarn. The inner wall of the crushed sample storage container 9 has several barbs 901 that pierce the breathable yarn. The crushed sample storage container 9 has several breathable holes 902. The rear center of the crushed sample storage container 9 has a central connecting hole 903. The weighing sensor 35 and the auxiliary fixing body 10 are both annular. The two weighing sensors 35 are respectively fitted at the front and rear ends of the crushed sample storage container 9. The fixing block 11 is located at the rear of the crushed sample storage tank 9. The fixing block 11 is a cylindrical structure with an open rear end. The outer circle of the fixing block 11 and the outer circle of the auxiliary fixing body 10 are both fixed to the core tube 1 by radially arranged countersunk screws 24 and washers 25. The inner end of the countersunk screw 24 is threadedly connected to the threaded hole 1106 provided on the fixing block 11. The outer surface of the fixing block 11 is provided with a second annular groove 1109 for installing an O-ring seal. The front end face of the fixing block 11 is open at both ends. The fixed block 11 has a shaft hole 1101, two rod holes 1102, a first wire hole 1103, an air outlet 1104 and an exhaust port 1105. An air inlet 1108 is provided on the fixed block 11, located behind the second annular groove 1109. The number of air inlets 1108 and the airflow elongated holes 102 are equal and they are connected to each other. A water inlet 1107 is provided on the inner wall of the fixed block 11, which is connected to the rear end of the two rod holes 1102. The water inlet 1107 at the front end of the water pipe 15 is connected to the water pipe 15. The rear weighing sensor 35 is fixedly connected to the rear side of the auxiliary fixing body 10, and the front weighing sensor 35 is fixedly connected to the rear side of the ball core base 8; the pneumatic motor 12 is set inside the fixing block 11, and the drive shaft of the pneumatic motor 12 passes forward through the through shaft hole 1101 and extends into the central connecting hole 903 and drives and seals with the crushed sample storage tank 9; the front end face of the pneumatic motor 12 is strictly sealed with the rear end face of the inner side of the fixing block 11.

[0021] The hydraulic drive assembly includes two hydraulic telescopic rods 7, both parallel to the center line of the core tube 1. Each hydraulic telescopic rod 7 includes a piston 701, a movable rod 702, and a fixed tube 703. The rear end of each fixed tube 703 passes through and is fixedly connected to the rod hole 1102. The fixed tube 703 passes through the auxiliary fixing body 10. The front end of each movable rod 702 passes through a guide hole 802 and contacts the rear side of a rotating wing plate 502. The rear end of each movable rod passes through the fixed tube 703. The piston 701 is slidably disposed in the fixed tube and fixedly connected to the rear end of the movable rod 702. The intelligent control-gas measurement component includes a gas supply sub-component, a gas measurement sub-component, and an electrical control sub-component; The air supply sub-assembly includes a main air supply pipe 13 and a one-in-three-out solenoid valve 17. The outlet of the main air supply pipe 13 is connected to the inlet of the one-in-three-out solenoid valve 17. The three outlets of the one-in-three-out solenoid valve 17 are respectively connected to a motor air supply pipe 1301, a drilling slag discharge air supply pipe 1302, and a tank cleaning air supply pipe 1303. The outlet of the motor air supply pipe 1301 is connected to the inlet of the pneumatic motor 12. The outlet of the drilling slag discharge air supply pipe 1302 is connected to the air inlet hole 1108 on the fixing block 11. The outlet of the tank cleaning air supply pipe 1303 is connected to the air outlet 1104 on the fixing block 11. The exhaust component includes a motor exhaust pipe 1401, a content testing tube 1402, and a Y-type quick-connect fitting 22. A flow meter 18, a pressure sensor 19, and a solenoid valve 20 are sequentially installed on the content testing tube 1402 along the airflow direction. The inlet of the motor exhaust pipe 1401 is connected to the outlet of the pneumatic motor 12, and the inlet of the content testing tube 1402 is connected to the exhaust port 1105 on the fixing block 11. The outlets of the motor exhaust pipe 1401 and the content testing tube 1402 are respectively inserted into ports A and B of the Y-type quick-connect fitting 22. The electronic control sub-assembly includes a main wire 16, a microcontroller module 21, and a series of branch wires 1601~1605. The main wire 16 is connected to the microcontroller module 21 for power supply and signal transmission. The signal output terminal of the microcontroller module 21 outputs five branch wires, which are: the first branch wire 1601 connected to the one-in-three-out solenoid valve 17, the second branch wire 1602 connected to the one-in-one-out solenoid valve 20, the third branch wire 1603 connected to the pressure sensor 19, the fourth branch wire 1604 connected to the flow meter 18, and the fifth branch wire 1605 connected to the weighing sensor 35. The fifth branch wire 1605 passes through the first wire through hole 1103 on the fixing block 11 and is connected to the two weighing sensors 35. The air inlet of the cleaning tank air supply pipe 1303 and the air outlet 1104 of the fixing block 11, the air inlet of the content test pipe 1402 and the exhaust port 1105 of the fixing block 11, the fifth branch wire 1605 and the first wire through hole 1103 on the fixing block 11, and all other pipelines and corresponding holes of the fixing block 11 are sealed by adhesive or welding. The inner circle of the rear end of the adapter 23 is provided with an internal thread 2301 for connecting to the drill rod assembly 70. A partition 2302 is provided in the middle of the interior of the adapter 23. The front end of the adapter 23 is inserted into the rear port of the core tube 1 and fixedly connected to the core tube 1 by a second screw. The outer circle of the front end of the adapter 23 is provided with two third annular grooves 2305 for installing a sealing ring and a second screw fixing hole 2306 for threaded connection of the second screw. The center of the partition 2302 is provided with a first water pipe through hole 2303 and an air pipe through hole 2307 and a first wire through hole 2308 surrounding the first water pipe through hole 2303. The adapter 23 is provided with an exhaust hole 2304 located in front of the partition 2302 along the radial direction. The outlet end of the Y-type quick connector 22 is inserted into the exhaust hole 2304. The rear end of the main air supply pipe 13 is connected to the air pipe through hole 2307. The rear end of the main wire 16 passes through the first wire through hole 2308. The water pipe 15 passes through the first water pipe through hole 2303. The drill rod assembly 70 includes a first drill rod 26 and several subsequent drill rods 37. The front end of the first drill rod 26 is connected to the rear end of the adapter 23 by a threaded connection. The first drill rod 26 includes a drill rod body 2603. A partition vent plate 27 is fixed on the front and rear sides of the inner wall of the drill rod body 2603, respectively. The partition vent plate 27 is provided with a second wire through hole 2701 and a second water pipe through hole 2702. The water pipe 15 and the main wire 16 inside the drill rod body 2603 pass through the second water pipe through hole 2702 and the second wire through hole 2701 on the two partition vent plates 27, respectively. The water pipe 15 consists of several sections and is connected by a bidirectional quick connector 28. The main wire 16 consists of several sections and is connected by a mating aviation connector 29. The water-air-electric three-channel drill tail assembly 30 includes a fixed part 3002 at the rear end and a rotating part 3001 at the front end, which are coaxially arranged. The outer circle at the front end of the fixed part 3002 and the inner circle at the rear end of the rotating part 3001 are rotatably connected by a bearing 3004. The outer circle on the right side of the rotating part 3001 has a third screw fixing hole 3003 for assembly with the subsequent drill rod 37. The structure of the subsequent drill rod 37 is basically the same as that of the first drill rod 26. The difference is that the front end of the drill rod is not threaded, but has a pin hole. On this basis, the two adjacent subsequent drill rods 37, the first subsequent drill rod 37 and the first drill rod 26, and the last subsequent drill rod 37 and the drill tail body 30 are all inserted and fixedly connected by radially arranged third screws and washers. The inner wall of the rotating part 3001 is provided with a first support frame 31, and the inner wall of the fixed part 3002 is provided with a second support frame 32. The first support frame 31 has a mounting hole in the center, and a sealing rotary joint 3103 is provided in the mounting hole. The fixed interface at the front end of the sealing rotary joint 3103 is connected to a rotating water guide pipe 3101. The front end of the rotating water guide pipe 3101 is connected to the rear end of the water pipe 15 through a bidirectional quick connector 28. The rotating interface at the rear end of the sealing rotary joint 3103 is connected to an L-shaped water injection pipe 3102. The L-shaped water injection pipe 3102 and the sealing rotary joint 3103 are sealed and rotate relative to each other. The rear end of the L-shaped water injection pipe 3102 passes through the second support frame 32 and out of the fixed part 3002 to connect to the underground water pipe in the coal mine. A valve is provided on the L-shaped water injection pipe 3102. The second support frame 32 is a composite metal part. An external wire 36 that passes through the fixing part 3002 is connected to the left side surface of the second support frame 32. The front end of the main wire 16 passes through the first support frame 31 and is connected to the brush 33. The rear end of the brush 33 contacts the front surface of the second support frame 32. When the drill rod 37 rotates, it drives the rotating part 3001, the rotating water guide pipe 3101, the second support frame 32, the sealing rotary joint 3103 and the brush 33 to rotate. The left end of the brush 33 slides against the second support frame 32 and conducts electricity and transmits signals.

[0022] The specific implementation process of the second step is as follows: Under the condition of gas supply only and no water supply, the drilling rig drives the drill rod assembly 70. The rotational power is sequentially transmitted through the adapter 23 and the core sampling device 60 to drive the drill bit 50 to drill into the coal seam to the designated core sampling depth. During this process, the spherical valve core 5 seals the channel between the pressure block 2 and the spherical core base 8. High-pressure gas enters from the drill tail port 34 → the gas flows through the subsequent drill rod 37 and the first drill rod 26 → and enters through the gas pipe perforation 2307 on the inner partition 2302 of the adapter 23. The main air inlet pipe 13 inside the core sampling device 60 flows through the one-in-three-out solenoid valve 17. The computer 40 controls the one-in-three-out solenoid valve 17 to open through the microcontroller module 21, controlling the high-pressure gas to flow into the drilling and slag discharge air supply pipe 1302. The gas then enters the air flow elongated hole 102 in the pipe wall of the core sampling pipe 1 through the air inlet hole 1108 set on the fixed block 11. Finally, the air flow is discharged from the front port 103 of the air flow elongated hole 102. The high-pressure air flow drives the coal slag in the borehole to be transported backward, thus exerting its drilling and slag discharge efficiency.

[0023] The specific implementation process of the third step is as follows: After the coring device 60 is sent into the designated position in the borehole, the data of the weighing sensor 35 is zeroed. Through the water-air-electric three-channel drill tail assembly 30, air and water are supplied to the coring device 60 simultaneously and continuously. The water flows through the water pipe 15 into the water inlet 1107 and then into the fixed pipe 703 to drive the piston 701 to move forward. The movable rod 702 moves forward under the push of the piston 701. The two movable rods 702 simultaneously push the corresponding rotating blade 502. The rotating blade 502 drives the ball valve core 5 to rotate around the positioning sleeve 503 as the center line. After the ball valve core 5 rotates 90°, the front and rear ports of the sample inlet 501 are connected to the inner holes of the pressure block 2 and the ball core base 8, respectively. Then the valve on the L-shaped water injection pipe 3102 is closed, so that the piston 701 remains stationary in the fixed pipe 703. At this time, the tension spring 6 is in a stretched state. Then, the drilling rig is turned on, and the coring device 60 and the drill bit 50 are driven to rotate and cored. The coal core passes through the inner hole of the drill bit 50 in sequence through the pressure block 2, the sampling hole 501 of the ball valve core 5, and the ball core base 8, and then enters the crushed sample storage tank 9. During the coring process, high-pressure gas enters from the drill tail port 34 → the gas flows through the subsequent drill rod 37 and the first drill rod 26 → through the gas pipe perforation 2307 on the inner partition 2302 of the adapter 23 and enters the main air inlet pipe 13 in the coring device 60 → flows through the one-in-three-out solenoid valve 17. The computer 40 controls the one-in-three-out solenoid valve 17 to open through the single-chip microcomputer module 21, controlling the high-pressure gas to flow into the drilling slag discharge gas supply pipe 1302 → through the air inlet hole 1108 set on the fixed block 11 and enters the air flow elongated hole 102 in the pipe wall of the coring tube 1. Finally, the air flow is discharged from the front port 103 of the air flow elongated hole 102, and the high-pressure air flow drives the coal slag in the borehole to be transported backward.

[0024] The specific implementation process of the fourth step is as follows: stop gas - stop water - seal the ball valve core 5: stop the drilling rig rotation, stop the water supply, open the valve on the L-shaped water injection pipe 3102, and after the water pressure is lost, the ball valve core 5 rotates in the opposite direction under the tension of the tension spring 6, causing the sample inlet 501 to close, thus achieving the sealing of the crushed sample storage tank 9; at the same time, under the reverse rotation of the rotating wing plate 502, the piston 701 and the movable rod 702 retract to their original positions.

[0025] The specific implementation process of the fifth step is as follows: After the front port of the crushed sample storage tank 9 is sealed by the ball valve core 5, the readings are obtained through two weighing sensors 35. F The values ​​are then transmitted to computer 40. For horizontal boreholes, the coal core mass m is denoted as... F / 9.81, for an inclination angle of a For borehole drilling, the coal core mass m is denoted as... F / (9.81*cos a ).

[0026] The specific implementation process of step six is ​​as follows: Pre-crushing gas content determination: After sealing the crushing sample storage tank 9 with the sealed spherical valve core 5, the computer 40 controls the opening of the one-in-three-out solenoid valve 17 via the microcontroller module 21. This allows the desorbed gas to flow into the content testing tube 1402 through the exhaust port 1105, sequentially passing through the flow meter 18, pressure sensor 19, and one-in-one-out solenoid valve 20, before being discharged into the borehole through the Y-type quick-connect connector 22. The measured data is transmitted to the microcontroller module 21 via the main wire 16, and then transmitted to the computer 40 outside the borehole. The cumulative gas flow rate before crushing is recorded as... q 1.

[0027] The specific implementation process of step seven is as follows: Continue to supply gas to the core sampling device 60. Under the control of the single-chip microcomputer module 21 of the computer 40, control the gas flow through the one-in-three-out solenoid valve 17 and distribute it to the motor gas supply pipe 1301, thereby driving the drive shaft of the pneumatic motor 12 to rotate, which in turn drives the crushing and storage tank 9 to rotate. Several barbs on the inner wall of the crushing and storage tank 9 cut the internal coal core, crushing it into coal samples. The gas measurement process after crushing is the same as the gas content determination process before crushing in step five. The cumulative gas flow rate after crushing is recorded as follows: q 2; The gas flowing out of the pneumatic motor 12 is discharged into the borehole through the motor exhaust pipe 1401 and the Y-type quick connector 22.

[0028] The specific implementation process of step eight is as follows: gas content Q Calculate: the residual gas content value of the coal seam Q 残余 Write to external computer 40, external computer 40 receives core quality. m Cumulative gas flow rate before crushing q 1. Cumulative gas flow rate after crushing q2. Computer 40 performs data processing, including gas content. Q Calculate using the following formula: Q = q 1+ q 2) / m+ Q 残余 .

[0029] The specific implementation process of the ninth step is as follows: Water pipe 15 supplies water into the fixed pipe 703, driving piston 701 to move forward. Movable rod 702 moves forward under the push of piston 701. Both movable rods 702 simultaneously push the corresponding rotating vane plate 502. The rotating vane plate 502 drives the spherical valve core 5 to rotate around the positioning sleeve 503 as the center line. After the spherical valve core 5 rotates 90°, the front and rear ends of the injection hole 501 are connected to the inner holes of the pressure block 2 and the ball core base 8, respectively. Then the valve on the L-shaped water injection pipe 3102 is closed; at the same time, the electric... Under the control of the single-chip microcomputer module 21, the one-in-three-out solenoid valve 17 distributes the airflow to the cleaning tank air supply pipe 1303, and enters the core sampling pipe 1 through the air outlet 1104. The airflow enters the crushed sample storage tank 9 through several vent holes 902, and blows the crushed coal sample forward through the ball core base 8, the sample inlet hole 501 of the ball valve core 5, and the pressure block 2 to the drill bit 50. After a period of time, the air and water supply is stopped, and the ball valve core 5 closes the passage between the ball core base 8 and the pressure block 2 again, thus ending the first core sampling.

[0030] The above embodiments illustrate the basic principles and features of the present invention, but are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the scope of protection of the present invention. Therefore, the scope of this patent and its protection should be determined by the appended claims.

Claims

1. A method for continuous multi-point intelligent precision measurement of gas content using in-situ closed core sampling, characterized in that: Includes the following steps: The first step is to assemble the in-situ closed core sampling gas content continuous multi-point intelligent precision measurement system, hereinafter referred to as the intelligent precision measurement system. The second step is to operate the drilling rig to drive the intelligent precision measurement system to carry out the air-no-water-drilling operation. Step 3: Control the drilling rig to drive the intelligent precision measurement system to carry out the gas-water-coring operation: Step 4: Control the drilling rig to drive the intelligent precision testing system to shut off gas and water supply and seal the coal sample. Step 5: Coal sample quality determination; Step 6: Determination of gas content in coal samples before crushing; Step 7: Determination of gas content after coal sample crushing; Step 8: Gas Content Q calculate; Step 9: Resupply gas and water - clean slag, blow the broken coal sample out of the intelligent precision testing system to complete one core sampling; Step 10: Continuous measurement of gas content in in-situ sealed coring: According to the set position of the coring point, start the drilling rig to drive the intelligent precision measurement system to continuously drill to the next coring position under the condition of only supplying gas and not water; then, repeat steps 2 to 9 to achieve continuous multi-point intelligent precision measurement of gas content in in-situ sealed coring.

2. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 1, is characterized in that: The intelligent precision measurement system includes a computer (40) and a drill bit (50), a core sampling device (60), an adapter (23), several drill rod assemblies (70), and a water-air-electric three-channel drill tail assembly (30) connected in series from front to back. The core sampling device (60) includes a core sampling tube (1), a ball valve sealing assembly, a block crushing-weighing assembly, a hydraulic drive assembly, and an intelligent control-gas measuring assembly; the core sampling tube (1) has a spiral groove (101) on its outer circumference. The ball valve sealing assembly is located inside the front side of the core tube (1). The core tube (1) has several airflow elongated holes (102) along its length. The front end of the airflow elongated holes (102) is connected to the outside of the core tube (1), and the rear end of the airflow elongated holes (102) is connected to the inside of the core tube (1). The ball valve sealing assembly, the block crushing-weighing assembly, and the intelligent control-gas measuring assembly are arranged sequentially from front to back inside the core tube (1). The hydraulic drive assembly is located inside the core tube (1) and outside the block crushing-weighing assembly. The hydraulic drive assembly extends forward to drive the ball valve sealing assembly to open. The rear end of the hydraulic drive assembly is connected to water passing through the drill pipe assembly (70). The tube (15) transmits the collected signals to the intelligent control-gas measurement component. The intelligent control-gas measurement component accurately measures the coal sample quality and gas desorption amount inside the block crushing-weighting component. The intelligent control-gas measurement component transmits data bidirectionally to the computer (40) outside the borehole. The high-pressure airflow introduced through the water-gas-electric three-channel drill tail assembly (30) is divided into three paths. The first high-pressure airflow is used to discharge slag to the outside during drilling and coring through the airflow long hole (102). The second high-pressure airflow provides driving power for the block crushing-weighting component. The third path is used to clean the coal sample inside the crushing-weighting component after testing. The ball valve sealing assembly includes a pressure block (2), a ball valve core (5), and a ball core base (8) arranged sequentially from front to back. The outer circle of the pressure block (2) is connected to the inner circle of the core extraction tube (1) by a thread (203) and a thread (104). The outer circle surface of the pressure block (2) is provided with 1 to 5 first annular grooves (202). The first annular grooves (202) are provided with a first O-ring seal (3) that seals with the inner circle of the core extraction tube (1). The front end surface of the pressure block (2) is provided with four disassembly holes (201). The outer circle of the base (8) is provided with multiple first screw fixing holes (803). The core tube (1) is provided with first screws extending into the first screw fixing holes (803) to fix the ball core base (8) in the radial direction. The pressure block (2) and the ball core base (8) are both provided with through holes in the front and back. The rear port of the inner hole of the pressure block (2) and the front port of the inner hole of the ball core base (8) are provided with stepped grooves (801). A polytetrafluoroethylene gasket (4) is installed in each of the two opposite stepped grooves (801). The spherical valve core (5) is set between the two polytetrafluoroethylene gaskets (4). The two sides of the spherical valve core (5) are circular planar structures with the center symmetry. A positioning sleeve (503) is fixed in the center of each of the two circular planar structures. The core tube (1) is provided with a pin screw extending into the positioning sleeve (503) in the radial direction. A rotating wing plate (502) is fixed on each of the two circular planar structures. Each rotating wing plate (502) passes through the center of the circular planar structure on the same side. The plates (502) have the same structure and are symmetrical about the center of the spherical valve core (5). A tension spring (6) is provided between the front side of one end of the rotating wing plate (502) and the rear end face of the pressure block (2). Two guide holes (802) are provided in the spherical core base (8), and each guide hole (802) corresponds to the rear side of the other end of the rotating wing plate (502). A through injection hole (501) is provided in the spherical valve core (5), and the center line of the injection hole (501) is perpendicular to the center line of the positioning sleeve (503). The block crushing-weighing assembly includes a crushing sample storage tank (9), a fixed block (11), a pneumatic motor (12), two weighing sensors (35), and an auxiliary fixed body (10). The crushed sample storage container (9) has a cylindrical structure with an open front end. The inner wall of the crushed sample storage container (9) is tightly covered with breathable yarn. The inner wall of the crushed sample storage container (9) has several barbs (901) that pierce the breathable yarn. Several breathable holes (902) are opened on the crushed sample storage container (9). A central connection hole (903) is opened at the center of the rear end of the crushed sample storage container (9). The weighing sensor (35) and the auxiliary fixing body (10) are both circular rings. The two weighing sensors (35) are respectively fitted on the front end and the rear end of the crushed sample storage container (9). The fixing block (11) is located on the rear side of the crushed sample storage tank (9). The fixing block (11) is a cylindrical structure with an open rear end. The outer circle of the fixing block (11) and the outer circle of the auxiliary fixing body (10) are both fixed in the core tube 1 by countersunk screws (24) and washers (25) arranged radially. The inner end of the countersunk screw (24) is threaded to the threaded hole (1106) provided on the fixing block (11). The outer circle surface of the fixing block (11) is provided with a second annular groove (1109) for installing O-ring seals. The front end face of the fixing block (11) is provided with a through shaft that is open at both ends. Hole (1101), two rod holes (1102), first wire hole (1103), air outlet (1104) and exhaust port (1105) are provided on the fixing block (11). An air inlet (1108) is provided on the second annular groove (1109). The number of air inlets (1108) and airflow elongated holes (102) are equal and they are connected one by one. A water inlet (1107) is provided on the inner wall of the fixing block (11) and is connected to the rear end of the two rod holes (1102). The water inlet (1107) at the front end of the water pipe (15) is connected. The rear weight sensor (35) is fixedly connected to the rear side of the auxiliary fixing body (10), and the front weight sensor (35) is fixedly connected to the rear side of the ball core base (8); the pneumatic motor (12) is set inside the fixing block (11), and the drive shaft of the pneumatic motor (12) passes forward through the through shaft hole (1101) and extends into the central connecting hole (903) and drives and seals with the crushed sample storage tank (9); the front end face of the pneumatic motor (12) is strictly sealed with the rear end face inside the fixing block (11); The hydraulic drive assembly includes two hydraulic telescopic rods (7) that are parallel to the center line of the core tube (1). Each hydraulic telescopic rod (7) includes a piston (701), a movable rod (702), and a fixed tube (703). The rear end of each fixed tube (703) is inserted into and fixedly connected to the rod hole (1102). The fixed tube (703) passes through the auxiliary fixing body (10). The front end of each movable rod (702) passes through a guide hole (802) and contacts the rear side of a rotating wing plate (502). The rear end of each movable rod is inserted into the fixed tube (703). The piston (701) is slidably disposed in the fixed tube and fixedly connected to the rear end of the movable rod (702). The intelligent control-gas measurement component includes a gas supply sub-component, a gas measurement sub-component, and an electrical control sub-component; The gas supply sub-assembly includes a main gas supply pipe (13) and a three-in-one-out solenoid valve (17). The outlet of the main gas supply pipe (13) is connected to the inlet of the three-in-one-out solenoid valve (17). The three outlets of the three-in-one-out solenoid valve (17) are respectively connected to a motor gas supply pipe (1301), a drilling slag discharge gas supply pipe (1302), and a tank cleaning gas supply pipe (1303). The outlet of the motor gas supply pipe (1301) is connected to the inlet of the pneumatic motor (12). The outlet of the drilling slag discharge gas supply pipe (1302) is connected to the inlet hole (1108) on the fixing block (11). The outlet of the tank cleaning gas supply pipe (1303) is connected to the outlet (1104) on the fixing block (11). The exhaust component includes a motor exhaust pipe (1401), a content test tube (1402), and a Y-type quick connector (22). A flow meter (18), a pressure sensor (19), and a solenoid valve (20) are installed sequentially along the airflow direction on the content test tube (1402). The inlet of the motor exhaust pipe (1401) is connected to the outlet of the pneumatic motor (12), and the inlet of the content test tube (1402) is connected to the exhaust port (1105) on the fixed block (11). The outlet of the motor exhaust pipe (1401) and the outlet of the content test tube (1402) are respectively inserted into the A port and the B port of the Y-type quick connector (22). The electronic control sub-component includes a main wire (16), a microcontroller module (21), and a series of branch wires (1601~1605). The main wire (16) is connected to the microcontroller module (21) for power supply and signal transmission. The microcontroller module (21) outputs five branch wires. The five branch wires include: the first branch wire (1601) connecting the one-in-three-out solenoid valve (17), the second branch wire (1602) connecting the one-in-one-out solenoid valve (20), the third branch wire (1603) connecting the pressure sensor (19), the fourth branch wire (1604) connecting the flow meter (18), and the fifth branch wire (1605) connecting the weighing sensor (35). The fifth branch wire (1605) passes through the first wire through hole (1103) on the fixing block (11) and is connected to the two weighing sensors (35). The air inlet of the cleaning tank air supply pipe (1303) and the air outlet (1104) of the fixing block (11), the air inlet of the content test pipe (1402) and the exhaust port (1105) of the fixing block (11), the fifth branch wire (1605) and the first wire through hole (1103) on the fixing block (11), and all other pipelines and corresponding holes of the fixing block (11) are sealed by adhesive or welding. The inner circle of the rear end of the adapter (23) is provided with an internal thread (2301) for connecting with the drill rod assembly (70). A partition (2302) is provided in the middle of the interior of the adapter (23). The front end of the adapter (23) is inserted into the rear port of the core tube (1) and fixedly connected to the core tube (1) by a second screw. The outer circle of the front end of the adapter (23) is provided with two third annular grooves (2305) for installing the sealing ring and a second screw fixing hole (2306) for threaded connection of the second screw. The center of the partition (2302) is provided with a first water pipe through. The adapter (23) has a vent hole (2304) located in front of the partition (2302) along the radial direction. The outlet end of the Y-type quick connector (22) is inserted into the vent hole (2304). The rear end of the main air supply pipe (13) is connected to the vent hole (2307), the rear end of the main wire (16) passes through the first wire hole (2308), and the water pipe (15) passes through the first water pipe hole (2303). The drill rod assembly (70) includes a first drill rod (26) and several subsequent drill rods (37). The front end of the first drill rod (26) is connected to the rear end of the adapter (23) by a threaded connection. The first drill rod (26) includes a drill rod body (2603). A partition vent plate (27) is fixed on the front and rear sides of the inner wall of the drill rod body (2603). The partition vent plate (27) is provided with a second wire through hole (2701) and a second water pipe through hole (2702). The water pipe (15) and the main wire (16) in the drill rod body (2603) pass through the second water pipe through hole (2702) and the second wire through hole (2701) on the two partition vent plates (27), respectively. The water pipe (15) is made of several sections and connected by a two-way quick connector (28). The main wire (16) is made of several sections and connected by a docking aviation plug (29). The water-air-electric three-channel drill tail assembly (30) includes a fixed part (3002) at the rear end and a rotating part (3001) at the front end, which are coaxially arranged. The outer circle at the front end of the fixed part (3002) and the inner circle at the rear end of the rotating part (3001) are rotatably connected by a bearing (3004). The outer circle on the right side of the drill tail rotating part (3001) has a third screw fixing hole (3003) for assembly with the subsequent drill rod (37). The structure of the subsequent drill rod (37) is basically the same as that of the first drill rod (26). The difference is that the front end of the drill rod is not threaded, but has a pin hole. On this basis, the two adjacent subsequent drill rods (37), the frontmost subsequent drill rod (37) and the first drill rod (26), and the last subsequent drill rod (37) and the drill tail body (30) are all inserted and fixedly connected by a radially arranged third screw and washer. The inner wall of the rotating part (3001) is provided with a first support frame (31), and the inner wall of the fixed part (3002) is provided with a second support frame (32). The first support frame (31) has an installation hole in the center, and a sealing rotary joint (3103) is provided in the installation hole. The fixed interface at the front end of the sealing rotary joint (3103) is connected to a rotating water guide pipe (3101). The front end of the rotating water guide pipe (3101) is connected to the rear end of the water pipe (15) through a bidirectional quick connector (28). The rotating interface at the rear end of the sealing rotary joint (3103) is connected to an L-shaped water injection pipe (3102). The L-shaped water injection pipe (3102) and the sealing rotary joint (3103) are sealed and rotate relative to each other. The rear end of the L-shaped water injection pipe (3102) passes through the second support frame (32) and out of the fixed part (3002) to connect to the underground water pipe of the coal mine. A valve is provided on the L-shaped water injection pipe (3102). The second support frame (32) is a composite metal part. An external wire (36) that passes through the fixing part (3002) is connected to the left side surface of the second support frame (32). The front end of the main wire (16) passes through the first support frame (31) and is connected to the brush (33). The rear end of the brush (33) contacts the front surface of the second support frame (32). When the drill rod (37) rotates, it drives the rotating part (3001), the rotating water guide pipe (3101), the second support frame (32), the sealing rotary joint (3103) and the brush (33) to rotate. The left end of the brush (33) slides against the second support frame (32) and conducts electricity and transmits signals.

3. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 2, is characterized in that: The specific implementation process of the second step is as follows: Under the condition of only supplying gas and not water, the drilling rig drives the drill rod assembly (70). The rotational power drives the drill bit (50) to drill into the coal seam to the specified core depth through the adapter (23) and the core sampling device (60). During this process, the ball valve core (5) seals the channel between the pressure block (2) and the ball core base (8). High-pressure gas enters from the drill tail port (34) → the gas flows through the subsequent drill rod (37) and the first drill rod (26) → through the gas pipe perforation (2307) on the inner partition plate (2302) of the adapter (23). The main air inlet pipe (13) enters the core sampling device (60) → flows through the one-in-three-out solenoid valve (17). The computer (40) controls the one-in-three-out solenoid valve (17) to open through the microcontroller module (21), and controls the high-pressure gas to flow into the drilling slag discharge air supply pipe (1302) → enters the air flow elongated hole (102) in the pipe wall of the core sampling pipe 1 through the air inlet hole (1108) set on the fixed block (11). Finally, the air flow is discharged from the front port (103) of the air flow elongated hole (102). The high-pressure air flow drives the coal slag in the borehole to be transported backward, giving full play to its drilling slag discharge efficiency.

4. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 3, is characterized in that: The specific implementation process of the third step is as follows: After the coring device (60) is sent into the designated position in the borehole, the data of the weighing sensor (35) is zeroed. Through the water-air-electric three-channel drill tail assembly (30), air and water are supplied to the coring device (60) simultaneously and continuously. The water flows through the water pipe (15) into the water inlet (1107) and then into the fixed pipe (703) to drive the piston (701) to move forward. The movable rod (702) moves forward under the push of the piston (701). The two movable rods move forward. The moving rod (702) simultaneously pushes the corresponding rotating wing plate (502), and the rotating wing plate (502) drives the spherical valve core (5) to rotate around the positioning sleeve (503) as the center line. After the spherical valve core (5) rotates 90°, the front and rear ends of the injection hole (501) are connected to the inner holes of the pressure block (2) and the ball core base (8) respectively. Then the valve on the L-shaped water injection pipe (3102) is closed, so that the piston (701) remains stationary in the fixed pipe (703). At this time, the tension spring 6 is in a stretched state. Then, the drilling rig is turned on, and the coring device (60) and drill bit (50) are driven to rotate and cored. The coal core passes through the inner hole of the drill bit (50) in sequence through the pressure block (2), the sampling hole (501) of the ball valve core (5), and the ball core base (8), and then enters the crushed sample storage tank (9). During the coring process, high-pressure gas enters from the drill tail port (34) → the gas flows through the subsequent drill rod (37) and the first drill rod (26) → and enters the coring device through the gas pipe perforation (2307) on the inner partition (2302) of the adapter (23). The main air inlet pipe (13) inside the (60) flows through the one-in-three-out solenoid valve (17). The computer (40) controls the one-in-three-out solenoid valve (17) to open through the microcontroller module (21), and controls the high-pressure gas to flow into the drilling slag discharge air supply pipe (1302) through the air inlet hole (1108) set on the fixed block (11) and enter the air flow long hole (102) in the pipe wall of the core tube 1. Finally, the air flow is discharged from the front port (103) of the air flow long hole (102), and the high-pressure air flow drives the coal slag in the borehole to be transported backward.

5. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 4, is characterized in that: The specific implementation process of the fourth step is as follows: stop gas - stop water - seal ball valve core (5): stop the drilling machine rotation, stop water supply, open the valve on the L-shaped water injection pipe (3102), after the water pressure is lost, the ball valve core (5) rotates in the opposite direction under the tension of the tension spring (6) to close the sample inlet (501) and realize the sealing of the crushed sample storage tank (9); at the same time, under the reverse rotation of the rotating wing plate (502), the piston 701 and the moving rod 702 retract to their original positions.

6. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 5, is characterized in that: The specific implementation process of the fifth step is as follows: After the front port of the crushed sample storage tank (9) is sealed by the ball valve core (5), the reading is obtained through two weighing sensors (35). F The values ​​are then transmitted to the computer (40). For horizontal boreholes, the coal core mass m is denoted as... F / 9.81, for an inclination angle of a For borehole drilling, the coal core mass m is denoted as... F / (9.81*cos a ).

7. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 6, is characterized in that: The specific implementation process of the sixth step is as follows: After sealing the crushing and storage tank (9) with the sealed ball valve core (5), the computer (40) controls the opening of the one-in-three-out solenoid valve (17) through the microcontroller module (21), controlling the desorbed gas to flow into the content test tube (1402) through the exhaust port (1105), and then through the flow meter (18), pressure sensor (19), one-in-one-out solenoid valve (20) in sequence, and then through the Y-type quick connector (22) into the borehole. The measured data is transmitted to the microcontroller module 21 through the main wire 16, and then the data is transmitted to the computer (40) outside the borehole. The cumulative gas flow rate before crushing is recorded as q 1.

8. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 7, is characterized in that: The specific implementation process of the seventh step is as follows: continue to supply gas to the core sampling device (60). Under the control of the single-chip microcomputer module (21) of the computer (40), control the gas flow through the one-in-three-out solenoid valve (17) and distribute it to the motor gas supply pipe (1301), thereby driving the drive shaft of the pneumatic motor (12) to rotate, thereby driving the crushing and storage tank (9) to rotate. Several barbs set on the inner wall of the crushing and storage tank (9) cut the coal core inside, crushing the coal core into coal samples. The gas measurement process after crushing is the same as the gas content measurement process before crushing in the fifth step. The cumulative gas flow rate after crushing is recorded as follows: q 2; The gas flowing out of the pneumatic motor (12) is discharged into the borehole through the motor exhaust pipe (1401) and the Y-type quick connector (22).

9. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 8, is characterized in that: The specific implementation process of step eight is as follows: gas content Q Calculate: the residual gas content value of the coal seam Q 残余 Write to the external computer (40), the external computer (40) receives the core quality. m Cumulative gas flow rate before crushing q 1. Cumulative gas flow rate after crushing q 2. The computer (40) processes the data to determine the gas content. Q Calculate using the following formula: Q =（ q 1+ q 2） / m+ Q 残余 。 10. The in-situ sealed core sampling method for continuous multi-point intelligent precision measurement of gas content, as described in claim 9, is characterized in that: The specific implementation process of the ninth step is as follows: Water pipe (15) supplies water into the fixed pipe (703) to drive piston (701) to move forward. Movable rod (702) moves forward under the push of piston (701). The two movable rods (702) simultaneously push the corresponding rotating blade (502). The rotating blade (502) drives the ball valve core (5) to rotate around the positioning sleeve (503) as the center line. After the ball valve core (5) rotates 90°, the front and rear ends of the injection hole (501) are connected to the inner holes of the pressure block (2) and the ball core base (8) respectively. Then the valve on the L-shaped water injection pipe (3102) is closed. At the same time, the electric... Under the control of the single-chip microcomputer module (21) of the brain (40), the one-in-three-out solenoid valve 17 distributes the airflow to the cleaning tank air supply pipe (1303), and enters the core sampling pipe (1) through the air outlet (1104). The airflow enters the crushed sample storage tank (9) through several vent holes (902), and blows the crushed coal sample forward through the ball core base (8), the sample inlet hole (501) of the ball valve core (5), and the pressure block (2) to blow out the drill bit (50). After a period of time, the air and water supply is stopped, and the ball valve core (5) closes the passage between the ball core base (8) and the pressure block (2) again, thus ending the first core sampling.

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