Bidirectional communication compensation type coal seam drilling gas pressure and flow measuring system and method
By introducing the principle of communicator and a two-way measurement device, the two-way measurement and compensation of gas pressure and flow are achieved, which solves the accuracy of traditional measurement systems in complex flow conditions, improves the accuracy and stability of gas measurement in coal seam, and supports coal mine safety manage.
Patent Information
- Application Number
- CN202411459234.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2024-12-10
AI Technical Summary
Traditional gas pressure and flow measurement systems cannot adapt to the complex gas flow conditions inside the coal seam, especially when the flow direction changes or there is reflux, the measurement results are inaccurate and are greatly affected by environmental factors, so they cannot meet the measurement accuracy of coal mine safety management. Require.
The principle of communicator is introduced, and the bidirectional measurement and compensation of gas pressure and flow are achieved through a two-way measurement device, an air replenishment pump, a pressure adjustment chamber, and a flow compensation chamber, ensuring the accurate measurement of the pressure and flow parameters of the drilling gas in an equilibrium state.
Through pressure and flow compensation, the accuracy and stability of measurements are improved, and more accurate data can be provided to support the safety management of coal seam mining and gas extraction in the event of a change in the direction of gas flow or the presence of reflux.
Smart Images
Figure CN119102605A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coal mine operation, in particular to a drilling measurement technology before gas. Background Art
[0002] Before formal extraction of coal seam gas, it is necessary to drill holes in the coal seam and measure the gas pressure and flow in the boreholes. For the sake of coal mine safety production, there is also a need to drill holes to measure gas pressure and flow.
[0003] The gas pressure and flow rate inside the coal seam have strong spatiotemporal dynamic characteristics and are easily affected by multiple factors such as mining activities, coal seam geological structure, temperature and humidity. These factors cause the borehole gas flow direction and gas pressure to be unstable, and bidirectional flow may occur. Traditional gas pressure and flow measurement systems cannot adapt to such complex flow conditions and can only measure gas pressure or flow parameters in the direction of outward flow from the borehole, which cannot accurately reflect the dynamic changes of gas inside the coal seam. When the direction of gas flow changes or there is a backflow, the measured data will fluctuate or error greatly, resulting in inaccurate measurement results.
[0004] Environmental conditions such as temperature, humidity, pressure and other factors will affect the existing gas pressure and flow measurement system, causing errors.
[0005] With the continuous improvement of coal mine safety management standards, the requirements for the measurement accuracy of gas pressure and flow parameters are becoming higher and higher. This not only requires the device to have higher measurement accuracy, but also requires it to be able to cope with complex coal seam gas flow conditions and provide stable and reliable data support to facilitate the effective operation of mine safety management and early warning systems.
[0006] The design idea of the present invention is: The communicating vessel principle is introduced into the gas pressure and flow measurement technology to realize the bidirectional measurement and compensation of gas pressure and flow, and provide a stable pressure condition (equilibrium state) to compensate for the changes in pressure conditions during the measurement process, so as to more accurately measure the gas pressure and flow parameters through pressure compensation and flow compensation when the gas flow direction changes or there is backflow. Summary of the invention
[0007] The purpose of the present invention is to provide a two-way communication compensation type coal seam drilling gas pressure and flow measurement system, which can accurately measure the coal seam drilling gas flow and flow through pressure and flow compensation.
[0008] To achieve the above-mentioned purpose, the bidirectional communication compensation type coal seam drilling gas pressure and flow measurement system of the present invention comprises a bidirectional measurement device, an air supply pump, a pressure regulating chamber and a flow compensation chamber; The outlet of the air supply pump is connected to the inlet of the pressure regulating chamber through the first pressure pipe. The volume of the pressure regulating chamber is more than 5 times that of the flow compensation chamber. A pressure sensor is provided in the pressure regulating chamber. The pressure sensor is connected to a pressure display screen for displaying the compensation pressure. The pressure display screen is located on the side wall of the pressure regulating chamber. The outlet of the pressure regulating chamber is connected to the flow compensation chamber; the flow compensation chamber is provided with a bidirectional flow sensor for measuring the gas volume at its outlet; the bidirectional flow sensor is connected to a single chip microcomputer, the single chip microcomputer is connected to a flow display screen for displaying the flow, and the flow display screen is located on the side wall of the flow regulating chamber; the bidirectional flow sensor is used to detect the forward flow and the reverse flow; The flow compensation chamber is provided with an outlet valve which is connected to the atmosphere; The bidirectional measuring device comprises a base, on which an air intake measuring mechanism and a compensation measuring mechanism are symmetrically arranged on the left and right sides of the base; the air intake measuring mechanism and the compensation measuring mechanism are symmetrical in structure, and both comprise a bottom plate and a scale cylinder, one end of the bottom plate is hinged to the bottom of the scale cylinder, and the other end of the bottom plate is upwardly provided with an arc plate, and an arc groove is arranged on the arc plate, and the center of the arc groove is the hinge point between the bottom plate and the bottom of the scale cylinder; an arc-shaped connecting plate is downwardly connected to the middle of the scale cylinder, and the connecting plate is connected with a bolt inserted into the arc groove, and a clamping nut is connected to the end of the bolt, and the clamping nut is used to fix the rotation position of the connecting plate and the scale cylinder; the outlet of the flow compensation chamber is connected to the upper end of the scale cylinder of the compensation measuring mechanism through a connecting hose; The lower end of the graduated cylinder of the air intake measuring mechanism is connected to the lower end of the graduated cylinder of the compensation measuring mechanism through a joint and a connecting pipe, and the upper end of the graduated cylinder of the air intake measuring mechanism is used to connect the drilling measuring tube.
[0009] A pressure chamber is connected in series between the first pressure pipe and the outlet of the air supply pump, and a pressure relief valve is installed on the pressure chamber; a one-way valve is connected in series on the first pressure pipe.
[0010] An angle scale for indicating the rotation angle is provided on the connecting plate.
[0011] The base is also provided with an inclinometer for observing the angle between the base and the horizontal plane.
[0012] An inlet valve is arranged at the upper end of the graduated cylinder of the air intake measuring mechanism, and the inlet valve is used for connecting the drilling measuring tube.
[0013] The present invention also discloses a method for measuring gas pressure and flow using the above-mentioned two-way communication compensation type coal seam drilling gas pressure and flow measurement system, which is performed according to the following steps: The first step is to connect; connect the two-way communication compensation type coal seam drilling gas pressure and flow measurement system at the coal seam drilling hole, and inject polar solvent into the scale cylinder of the air intake measurement mechanism and the compensation measurement mechanism until the half cylinder state, at this time the connecting pipe is filled with polar solvent; Install a borehole measuring tube in the borehole, lead the borehole measuring tube out of the borehole and extend it into the upper end of the graduated cylinder of the air intake measuring mechanism; in the initial state, the inlet valve is in a closed state; The second step is leveling: observe the inclination of the inclinometer and place the base in a horizontal state; The third step is to adjust the inclination of the scale cylinder: determine the inclination of the scale cylinders of the intake measurement mechanism and the compensation measurement mechanism according to the angle of the experimental design, and ensure that the inclination of the scale cylinders of the intake measurement mechanism and the compensation measurement mechanism are the same; The specific adjustment action is: first loosen the clamping nut, then move the bolt and the connecting plate along the arc groove, observe the angle scale during the movement, and after moving to the predetermined angle, rotate the clamping nut to press it tightly on the arc plate, thereby fixing the inclination angle of the scale cylinder; The fourth step is the initial measurement: open the inlet valve and the outlet valve to allow the gas in the borehole to enter the graduated cylinder of the air intake measuring mechanism. Under the action of the air pressure, the liquid level in the graduated cylinder of the air intake measuring mechanism drops, while the liquid level in the graduated cylinder of the compensation measuring mechanism rises. According to the scale on the side wall of the graduated cylinder, the initial flow rate can be read through the liquid level changes in the graduated cylinders of the air intake measuring mechanism and the compensation measuring mechanism. The initial flow rate is equal to the forward flow rate Q1 measured by the bidirectional flow sensor at this time. The single chip displays the Q1 information on the flow display screen. The fourth step is the compensation measurement: Close the air outlet valve, then turn on the air supply pump to gradually increase the pressure to increase the air pressure in the pressure regulating chamber and the flow compensation chamber; observe the air pressure in the pressure regulating chamber through the pressure display screen; during the pressurization process, observe the liquid level in the scale cylinder of the air intake measuring mechanism and the compensation measuring mechanism, and the state when the liquid level in the scale cylinder of the air intake measuring mechanism and the compensation measuring mechanism is flush is called the equilibrium state; when the liquid level reaches the equilibrium state, turn off the air supply pump, at this time the pressure in the pressure regulating chamber is the same as the drilling gas pressure, record the pressure displayed on the pressure display screen at this time as the compensated pressure; the bidirectional flow sensor detects the reverse flow Q2 in the compensation measurement as the compensation flow, and the single-chip microcomputer calculates the total flow SUMQ=Q1-Q2; and displays Q1, Q2, and SUMQ on the flow display screen at the same time; the single-chip microcomputer displays the compensated pressure on the pressure display screen.
[0014] After the compensation measurement, the system is allowed to stand for the time specified by the experiment designer. After the specified time, if the equilibrium state is not broken, the SUMQ and the compensated pressure are used as the final borehole flow data and pressure data; If the equilibrium state is broken several times, the fourth step, i.e., the compensation measurement step, is performed each time the equilibrium state is broken to obtain the latest compensated pressure and a new compensated flow QI, where I is a natural number greater than or equal to 3. At the same time, the microcontroller updates the latest SUMQ value to the sum of the original SUMQ and QI until the specified time is reached to obtain the final compensated pressure and the latest SUMQ value.
[0015] The present invention has the following advantages: The present invention introduces the principle of a communicating vessel through a bidirectional measuring device, providing a basis for compensation measurement according to a balanced state. The arrangement of related structures such as an air supply pump, a pressure regulating chamber and a flow compensation chamber provides a basis for obtaining compensated pressure and compensated flow through compensation measurement.
[0016] The volume of the pressure regulating chamber is more than 5 times that of the flow compensation chamber, which can reduce pressure fluctuations when performing flow and pressure compensation operations.
[0017] The pressure relief valve is used to release the pressure in the system after the measurement is completed. The one-way valve can prevent the air pressure in the pressure regulating chamber from leaking from the air supply pump after the pressure regulating chamber is pressurized.
[0018] Through the angle scale, the staff can accurately adjust the rotation angle of the scale cylinders of the two sets of bidirectional measuring devices to be consistent. The inlet valve can conveniently control whether the drilling gas enters the intake measurement mechanism.
[0019] The present invention introduces the communicating vessel principle into the measurement technology of gas pressure and flow, and can determine the borehole gas pressure (as the borehole gas pressure parameter when extracting gas) through the equilibrium state and compensation pressure, so that the measurement result is more accurate. The gas pressure and flow measurement method of the present invention introduces compensation measurement, which can compensate for the changes in pressure conditions and the like during the measurement process, and takes into account the reflux phenomenon. Compared with the previous method of directly and simply measuring the borehole gas flow and pressure, more accurate borehole gas flow and pressure data can be obtained, which can better guide the practice of coal seam mining and gas extraction.
[0020] The setting of the system static period takes into account the factors that the internal conditions of the borehole change over time during the extraction process, so that the final borehole gas pressure and flow data measured by the system are more consistent with the coal seam gas extraction practice. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of a two-way communication compensation type coal seam drilling gas pressure and flow measurement system of the present invention.
[0022] Figure 2 It is a schematic diagram of the structure of a bidirectional measurement device.
[0023] Figure 3 It is a schematic diagram of the structure of an intake measuring mechanism or a compensation measuring mechanism, and the two structures are symmetrical. DETAILED DESCRIPTION
[0024] like Figures 1 to 3 As shown, the present invention provides a two-way communication compensation type coal seam drilling gas pressure and flow measurement system, including a two-way measurement device 1, an air supply pump 2, a pressure regulating chamber 3 and a flow compensation chamber 4; The outlet of the air supply pump 2 is connected to the inlet of the pressure regulating chamber 3 through the first pressure pipe 5. The volume of the pressure regulating chamber 3 is more than 5 times that of the flow compensation chamber 4. A pressure sensor is provided in the pressure regulating chamber 3. The pressure sensor is connected to a pressure display screen 6 for displaying the compensation pressure. The pressure display screen 6 is located on the side wall of the pressure regulating chamber 3. The outlet of the pressure regulating chamber 3 is connected to the flow compensation chamber 4; the flow compensation chamber 4 is provided with a bidirectional flow sensor for measuring the gas volume at its outlet; the bidirectional flow sensor is connected to a single-chip microcomputer (such as a 51 single-chip microcomputer, embedded in the inner wall or outer wall of the flow regulating chamber), and the single-chip microcomputer is connected to a flow display screen 7 for displaying the flow, and the flow display screen 7 is located on the side wall of the flow regulating chamber; the bidirectional flow sensor is used to detect the forward flow (i.e. the direction from the connecting hose into the flow compensation chamber 4) and the reverse flow (i.e. the direction from the flow compensation chamber 4 into the connecting hose); the pressure sensor, the bidirectional flow sensor and the single-chip microcomputer (such as a 51 single-chip microcomputer) are all prior art and are not shown in the figure.
[0025] The flow compensation chamber 4 (at the top) is provided with an outlet valve 8, which is connected to the atmosphere; the outlet valve 8 is used to allow the gas in the flow compensation chamber 4 to flow out from the outlet valve 8 when gas is introduced into the system, thereby maintaining the state of atmospheric pressure, making it easier for the gas to enter the system smoothly.
[0026] The bidirectional measuring device 1 comprises a base 9, on which an air intake measuring mechanism 10 and a compensation measuring mechanism 11 are symmetrically arranged; the air intake measuring mechanism 10 and the compensation measuring mechanism 11 are symmetrical in structure, and both comprise a bottom plate 12 and a graduated cylinder 13, and the side wall of the graduated cylinder 13 has a scale indicating the volume; one end of the bottom plate 12 is hinged to the bottom of the graduated cylinder 13, and the other end of the bottom plate 12 is upwardly provided with an arc plate 14, on which an arc groove 15 is arranged, and the center of the arc groove 15 is the hinge point between the bottom plate 12 and the bottom of the graduated cylinder 13; an arc-shaped connecting plate 16 is downwardly connected to the middle of the graduated cylinder 13, and the connecting plate 16 is connected to a bolt 17 inserted into the arc groove 15, and a tightening nut 18 is connected to the end of the bolt 17, and the tightening nut 18 is used to fix the rotational position of the connecting plate 16 and the graduated cylinder 13 after tightening; the outlet of the flow compensation chamber 4 is connected to the upper end of the graduated cylinder 13 of the compensation measuring mechanism 11 through a connecting hose 19; The lower end of the scale cylinder 13 of the intake measurement mechanism 10 is connected to the lower end of the scale cylinder 13 of the compensation measurement mechanism 11 through a joint 22 and a connecting pipe 20 , and the upper end of the scale cylinder 13 of the intake measurement mechanism 10 is used to connect to the drilling measurement tube 21 .
[0027] The present invention introduces the communicating vessel principle through the bidirectional measuring device 1, providing a basis for compensation measurement according to the equilibrium state. The arrangement of the air supplement pump 2, the pressure regulating chamber 3 and the flow compensation chamber 4 and other related structures provides a basis for obtaining the compensated pressure and compensated flow through compensation measurement.
[0028] The volume of the pressure regulating chamber 3 is more than five times that of the flow compensation chamber 4, which can make the pressure fluctuation smaller when performing flow and pressure compensation operations.
[0029] A pressure chamber 23 is connected in series between the first pressure pipe 5 and the outlet of the air supply pump 2 , and a pressure relief valve 24 is installed on the pressure chamber 23 ; a one-way valve 25 is connected in series on the first pressure pipe 5 .
[0030] The pressure relief valve 24 is used to open the pressure relief valve 24 to release the pressure in the system after the measurement work is completed. The one-way valve 25 can prevent the air pressure in the pressure regulating chamber 3 from leaking from the air supply pump 2 after the pressure regulating chamber 3 is pressurized.
[0031] An angle scale for indicating the rotation angle is provided on the connecting plate 16. Through the angle scale, the staff can accurately adjust the rotation angles of the scale cylinders 13 of the two sets of bidirectional measuring devices 1 to be consistent.
[0032] The base 9 is also provided with an inclinometer 26 for observing the angle between the base 9 and the horizontal plane. The upper end of the graduated cylinder 13 of the air intake measuring mechanism 10 is provided with an inlet valve 27, which is used to connect the borehole measuring tube 21. The inlet valve 27 can conveniently control whether the borehole gas enters the air intake measuring mechanism 10.
[0033] In the present invention, the measured volume value is used to represent the flow value. The present invention also discloses a method for measuring gas pressure and flow using the above-mentioned two-way communication compensation type coal seam drilling gas pressure and flow measurement system, which is performed according to the following steps: The first step is to connect; connect the two-way connected compensated coal seam drilling gas pressure and flow measurement system at the coal seam borehole, inject polar solvent into the scale cylinder 13 of the air intake measurement mechanism 10 and the compensation measurement mechanism 11 to a half-cylinder state, and then the connecting pipe 20 is filled with polar solvent; water is preferably used as the polar solvent, and other polar solvents such as methanol can also be used.
[0034] A borehole measuring tube 21 is installed in the borehole, and the borehole measuring tube 21 is led out of the borehole and inserted into the upper end of the graduated cylinder 13 of the air intake measuring mechanism 10; in the initial state, the inlet valve 27 is in a closed state; The second step is leveling: observe the inclination of the inclinometer 26 to place the base 9 in a horizontal state; The third step is to adjust the inclination angle of the scale cylinder 13: determine the inclination angle of the scale cylinder 13 of the intake measurement mechanism 10 and the compensation measurement mechanism 11 according to the angle of the experimental design (preferably 45°±10), and ensure that the inclination angles of the scale cylinder 13 of the intake measurement mechanism 10 and the compensation measurement mechanism 11 are the same; The specific adjustment action is: first loosen the clamping nut 18, then move the bolt 17 and the connecting plate 16 along the arc groove 15, observe the angle scale during the movement, and after moving to a predetermined angle, rotate the clamping nut 18 to press it tightly against the arc plate 14, thereby fixing the inclination angle of the scale cylinder 13; The fourth step is the initial measurement: open the inlet valve 27 and the outlet valve 8, so that the gas in the borehole enters the graduated cylinder 13 of the air intake measuring mechanism 10. Under the action of the air pressure, the liquid level in the graduated cylinder 13 of the air intake measuring mechanism 10 decreases, while the liquid level in the graduated cylinder 13 of the compensation measuring mechanism 11 increases. According to the scale on the side wall of the graduated cylinder 13, the initial flow rate can be read through the liquid level changes in the graduated cylinder 13 of the air intake measuring mechanism 10 and the compensation measuring mechanism 11. The initial flow rate is equal to the forward flow rate Q1 measured by the bidirectional flow sensor at this time. The single chip displays the Q1 information on the flow display screen 7. The fourth step is the compensation measurement: Close the air outlet valve 8, then open the air supply pump 2 to gradually increase the pressure, thereby increasing the air pressure in the pressure regulating chamber 3 and the flow compensation chamber 4; observe the air pressure in the pressure regulating chamber 3 through the pressure display screen 6; during the pressurization process, observe the liquid levels in the scale cylinders 13 of the air intake measurement mechanism 10 and the compensation measurement mechanism 11, and the state when the liquid levels in the scale cylinders 13 of the air intake measurement mechanism 10 and the compensation measurement mechanism 11 are flush is called the equilibrium state; when the liquid level reaches the equilibrium state, close the air supply pump 2. Due to the principle of the communicating vessel, the pressure in the pressure regulating chamber 3 is the same as the drilling gas pressure at this time. The pressure displayed on the pressure display screen 6 at this time is recorded as the compensated pressure, that is, the accurate drilling gas pressure; the bidirectional flow sensor detects the reverse flow Q2 in the compensation measurement as the compensation flow, and the single-chip microcomputer calculates the total flow SUMQ=Q1-Q2; and displays Q1, Q2, and SUMQ on the flow display screen 7 at the same time; the single-chip microcomputer displays the compensated pressure on the pressure display screen 6.
[0035] The present invention introduces the communicating vessel principle into the measurement technology of gas pressure and flow, and can determine the borehole gas pressure (as the borehole gas pressure parameter when extracting gas) through the equilibrium state and compensation pressure, so that the measurement result is more accurate. The gas pressure and flow measurement method of the present invention introduces compensation measurement, which can compensate for the changes in pressure conditions and the like during the measurement process, and takes into account the reflux phenomenon. Compared with the previous method of directly and simply measuring the borehole gas flow and pressure, more accurate borehole gas flow and pressure data can be obtained, which can better guide the practice of coal seam mining and gas extraction.
[0036] After the compensation measurement, the system is allowed to stand for the time specified by the experiment designer. After the specified time, if the equilibrium state is not broken (the liquid levels in the scale cylinders 13 of the air intake measurement mechanism 10 and the compensation measurement mechanism 11 are always flush), SUMQ and the pressure after compensation are used as the final drilling flow data and pressure data; If the equilibrium state is broken several times, the fourth step, i.e., the compensation measurement step, is performed each time the equilibrium state is broken to obtain the latest compensated pressure and a new compensated flow QI, where I is a natural number greater than or equal to 3. At the same time, the microcontroller updates the latest SUMQ value to the sum of the original SUMQ and QI (when QI is a forward flow, the new SUMQ is equal to the original SUMQ+QI; when QI is a reverse flow, the new SUMQ is equal to the original SUMQ-QI), until the specified time is reached, the final compensated pressure and the latest SUMQ value are obtained.
[0037] Designers specify the system static time based on geological conditions, comprehensive characteristics of coal seams and extraction plans, so that possible changes in gas pressure and flow during the extraction period are within the consideration range of this system.
[0038] The setting of the system static period takes into account the factors that the internal conditions of the borehole change over time during the extraction process, so that the final borehole gas pressure and flow data measured by the system are more consistent with the coal seam gas extraction practice.
[0039] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.
Claims
1. A two-way communication compensation type coal seam drilling gas pressure and flow measurement system, characterized by: It includes a bidirectional measuring device, an air supply pump, a pressure regulating chamber and a flow compensation chamber; The outlet of the air supply pump is connected to the inlet of the pressure regulating chamber through the first pressure pipe. The volume of the pressure regulating chamber is more than 5 times that of the flow compensation chamber. A pressure sensor is provided in the pressure regulating chamber. The pressure sensor is connected to a pressure display screen for displaying the compensation pressure. The pressure display screen is located on the side wall of the pressure regulating chamber. The outlet of the pressure regulating chamber is connected to the flow compensation chamber; The flow compensation chamber is provided with a bidirectional flow sensor for measuring the gas volume at its outlet; the bidirectional flow sensor is connected to a single-chip microcomputer, the single-chip microcomputer is connected to a flow display screen for displaying the flow, and the flow display screen is located on the side wall of the flow regulating chamber; the bidirectional flow sensor is used to detect the forward flow and the reverse flow; The flow compensation chamber is provided with an outlet valve which is connected to the atmosphere; The bidirectional measuring device comprises a base, on which an air intake measuring mechanism and a compensation measuring mechanism are symmetrically arranged on the left and right sides of the base; the air intake measuring mechanism and the compensation measuring mechanism are symmetrical in structure, and both comprise a bottom plate and a scale cylinder, one end of the bottom plate is hinged to the bottom of the scale cylinder, and the other end of the bottom plate is upwardly provided with an arc plate, and an arc groove is arranged on the arc plate, and the center of the arc groove is the hinge point between the bottom plate and the bottom of the scale cylinder; an arc-shaped connecting plate is downwardly connected to the middle of the scale cylinder, and the connecting plate is connected with a bolt inserted into the arc groove, and a clamping nut is connected to the end of the bolt, and the clamping nut is used to fix the rotation position of the connecting plate and the scale cylinder; the outlet of the flow compensation chamber is connected to the upper end of the scale cylinder of the compensation measuring mechanism through a connecting hose; The lower end of the graduated cylinder of the air intake measuring mechanism is connected to the lower end of the graduated cylinder of the compensation measuring mechanism through a joint and a connecting pipe, and the upper end of the graduated cylinder of the air intake measuring mechanism is used to connect the drilling measuring tube.
2. The two-way communication compensation type coal seam drilling gas pressure and flow measurement system according to claim 1 is characterized in that: A pressure chamber is connected in series between the first pressure pipe and the outlet of the air supply pump, and a pressure relief valve is installed on the pressure chamber; a one-way valve is connected in series on the first pressure pipe.
3. The two-way communication compensation type coal seam drilling gas pressure and flow measurement system according to claim 1 is characterized in that: An angle scale for indicating the rotation angle is provided on the connecting plate.
4. The two-way communication compensation type coal seam drilling gas pressure and flow measurement system according to claim 3 is characterized in that: The base is also provided with an inclinometer for observing the angle between the base and the horizontal plane.
5. The two-way communication compensation type coal seam drilling gas pressure and flow measurement system according to claim 4 is characterized in that: An inlet valve is arranged at the upper end of the graduated cylinder of the air intake measuring mechanism, and the inlet valve is used for connecting the drilling measuring tube.
6. A method for measuring gas pressure and flow using the two-way communication compensation type coal seam drilling gas pressure and flow measurement system as claimed in claim 5, characterized in that Follow these steps: The first step is to connect; connect the two-way communication compensation type coal seam drilling gas pressure and flow measurement system at the coal seam drilling hole, and inject polar solvent into the scale cylinder of the air intake measurement mechanism and the compensation measurement mechanism until the half cylinder state, at this time the connecting pipe is filled with polar solvent; Install a borehole measuring tube in the borehole, lead the borehole measuring tube out of the borehole and extend it into the upper end of the graduated cylinder of the air intake measuring mechanism; in the initial state, the inlet valve is in a closed state; The second step is leveling: observe the inclination of the inclinometer and place the base in a horizontal state; The third step is to adjust the inclination of the scale cylinder: determine the inclination of the scale cylinders of the intake measurement mechanism and the compensation measurement mechanism according to the angle of the experimental design, and ensure that the inclination of the scale cylinders of the intake measurement mechanism and the compensation measurement mechanism are the same; The specific adjustment action is: first loosen the clamping nut, then move the bolt and the connecting plate along the arc groove, observe the angle scale during the movement, and after moving to the predetermined angle, rotate the clamping nut to press it tightly on the arc plate, thereby fixing the inclination angle of the scale cylinder; The fourth step is the initial measurement: open the inlet valve and the outlet valve to allow the gas in the borehole to enter the graduated cylinder of the air intake measuring mechanism. Under the action of the air pressure, the liquid level in the graduated cylinder of the air intake measuring mechanism drops, while the liquid level in the graduated cylinder of the compensation measuring mechanism rises. According to the scale on the side wall of the graduated cylinder, the initial flow rate can be read through the liquid level changes in the graduated cylinders of the air intake measuring mechanism and the compensation measuring mechanism. The initial flow rate is equal to the forward flow rate Q1 measured by the bidirectional flow sensor at this time. The single chip displays the Q1 information on the flow display screen. The fourth step is the compensation measurement: Close the air outlet valve, then turn on the air supply pump to gradually increase the pressure to increase the air pressure in the pressure regulating chamber and the flow compensation chamber; observe the air pressure in the pressure regulating chamber through the pressure display screen; during the pressurization process, observe the liquid level in the scale cylinder of the air intake measuring mechanism and the compensation measuring mechanism, and the state when the liquid level in the scale cylinder of the air intake measuring mechanism and the compensation measuring mechanism is flush is called the equilibrium state; when the liquid level reaches the equilibrium state, turn off the air supply pump, at this time the pressure in the pressure regulating chamber is the same as the drilling gas pressure, record the pressure displayed on the pressure display screen at this time as the compensated pressure; the bidirectional flow sensor detects the reverse flow Q2 in the compensation measurement as the compensation flow, and the single-chip microcomputer calculates the total flow SUMQ=Q1-Q2; and displays Q1, Q2, and SUMQ on the flow display screen at the same time; the single-chip microcomputer displays the compensated pressure on the pressure display screen.
7. The method for measuring gas pressure and flow rate according to claim 6, characterized in that: After the compensation measurement, the system is allowed to stand for the time specified by the experiment designer. After the specified time, if the equilibrium state is not broken, the SUMQ and the compensated pressure are used as the final borehole flow data and pressure data; If the equilibrium state is broken several times, the fourth step, i.e., the compensation measurement step, is performed each time the equilibrium state is broken to obtain the latest compensated pressure and a new compensated flow QI, where I is a natural number greater than or equal to 3. At the same time, the microcontroller updates the latest SUMQ value to the sum of the original SUMQ and QI until the specified time is reached to obtain the final compensated pressure and the latest SUMQ value.