CN117491251A - Automatic determination method and device for permeability coefficient of coal seam - Google Patents
Automatic determination method and device for permeability coefficient of coal seam Download PDFInfo
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- CN117491251A CN117491251A CN202311542781.2A CN202311542781A CN117491251A CN 117491251 A CN117491251 A CN 117491251A CN 202311542781 A CN202311542781 A CN 202311542781A CN 117491251 A CN117491251 A CN 117491251A
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- 239000003245 coal Substances 0.000 title claims abstract description 82
- 230000035699 permeability Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 57
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 8
- 238000013508 migration Methods 0.000 claims description 7
- 230000005012 migration Effects 0.000 claims description 7
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
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- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
A method and a device for automatically measuring the permeability coefficient of a coal seam are characterized in that a singlechip, electronic flow sensors I and II, a signal connecting wire and an explosion-proof air pipe are arranged in an intrinsic safety cavity, the singlechip is used for collecting the gas flow detected by the electronic flow sensors I and II, collected flow values are displayed through an LCD touch screen, after sensing the gas in different flow ranges, the electronic flow sensors I and II in two gears are switched through MOS (metal oxide semiconductor) tubes on the singlechip board, the singlechip carries out calculation processing on the measured data, and the calculated result is stored in an SD card and can be transmitted to other equipment through Bluetooth. The invention can realize automatic, high-precision and rapid measurement of the coal seam permeability coefficient, and can greatly improve the accuracy and the efficiency of coal seam permeability coefficient measurement.
Description
Technical Field
The invention relates to a coal seam gas permeability coefficient measuring device, in particular to an automatic measuring method and device for the coal seam gas permeability coefficient, and belongs to the technical field of coal mine gas parameter measurement.
Background
The permeability coefficient of the coal bed is one of key basic parameters for researching the gas flow rule in the coal body, preventing and treating coal and gas outburst and gas extraction and utilization. The current on-site direct measurement method of the coal bed permeability coefficient mainly comprises a flow method and a pressure method, wherein the flow method is most widely used, and a ' coal bed permeability coefficient measurement method-radial flow method ' (MT/T1173-2019) of the coal industry standard of the people's republic of China is formulated. The radial flow method is a method for calculating the permeability coefficient of the coal seam by measuring parameters such as the gas pressure of the coal seam, the gas flow of the drilled holes and the like by adopting the drilled holes which are vertical to the coal seam as much as possible. The standard method adopts manual reading and manual trial calculation, the measuring process is complex, a great deal of time and labor cost are consumed for completion, and the measuring result has low precision. The invention patent in China, which is published 3/13/2020, discloses a mobile rapid coal and rock permeability coefficient tester with a publication number of CN110879188A, which needs to use an exhaust valve and a high-pressure gas cylinder, has high requirement on air tightness of a pipeline, is complex to operate, and is inconvenient and dangerous to carry. The invention discloses a device and a method for measuring anisotropic permeability coefficient of a bedding drilling coal seam, wherein the device is disclosed in China patent No. CN116106166A, and the method is characterized in that high-pressure tracer gas SF6 is injected into a coal seam drilling hole, the time for detecting the tracer gas in the detection drilling hole is recorded, and the method needs to additionally construct the detection drilling hole, so that the underground field engineering quantity is greatly increased.
Disclosure of Invention
The invention aims to provide an automatic measuring method and device for the gas permeability coefficient of a coal seam, which can realize the measurement of the gas permeability coefficient of the coal seam, the measuring process is automatically carried out, the unreliability of manual reading is omitted, and the error of the measuring result is small.
In order to achieve the above object, the present invention provides an automated measurement method for the permeability coefficient of a coal seam, comprising the steps of:
(1) connecting a gas drilling discharge pipe to an inlet of an air inlet ball valve, connecting an external power supply to an aviation socket by using an aviation plug to supply power to the device, detecting gas path connection to ensure that the gas path connection is correct, opening the air inlet ball valve and an air outlet ball valve, clicking a touch screen to enter a corresponding coal seam air permeability coefficient measuring functional interface, inputting a relevant coefficient of a measured coal seam, and clicking to start measuring after the input is finished to enter a measuring stage;
(2) in the measuring process, the electronic flow sensor I and the electronic flow sensor II transmit the flow values measured by the electronic flow sensor I and the electronic flow sensor II to the singlechip through the circuit;
(3) after the measurement is started, the on-board MOS tube is regulated by the singlechip, only the power supply of the electronic flow sensor I is started, the power supply of the electronic flow sensor II is disconnected, and when the gas flow sensed by the electronic flow sensor I is less than 1000mL/min, the power supply of the electronic flow sensor I is disconnected, and meanwhile, the power supply of the electronic flow sensor II is started;
(4) in the measurement process, a certain gas flow is measured every 4 hours before 48 hours, and a certain gas flow is measured every 6 hours after 48 hours; when the electronic flow sensor I and the electronic flow sensor II do not perform flow measurement, automatically disconnecting power supply of equipment except the singlechip, and recovering power supply when waiting for the next measurement;
(5) in the measurement process of the step (4), the duration of each measurement is 5 minutes, the flow data is recorded every minute, and the jth measurement data is recorded as q ij (i=1, 2,3,4, 5); each measurement uses the average value of the gas flow as the result of the measurement, and the average value is recorded asCalculating the average change rate of the gas flow measured before and after, and recording as +.>Continuously measuring until the gas flow is flatIf the average change rate is less than 10%, stopping measuring the gas flow data, and recording the average value Q of the gas flow measured last time;
(6) after drilling gas flow measurement is completed, the system utilizes a preset coal bed gas migration dynamics model to fit and calculate the coal bed gas permeability coefficient according to the recorded last gas flow average value Q;
(7) after the calculation flow is finished, confirming stored data, switching off a power supply, closing an air inlet ball valve, closing an air outlet ball valve, and preventing sundries from entering a pipeline system;
(8) the measurement data can be viewed on a computer through the SD memory card or sent to other devices through Bluetooth.
The coal bed gas migration dynamics model of the invention is as follows:
wherein: lambda is the permeability coefficient of the coal bed, m 2 /(MPa 2 ·d)；
Q is the average value of the gas flow rate measured last time, m 3 /d；
x, n, m are dimensionless parameters, and automatic assignment is judged by the inside of the calculation program;
p is the original gas pressure of the coal bed and MPa;
t is the time interval from the beginning of gas discharge of the drill hole to the end of gas flow measurement, d;
x is the gas content of the coal seam, m 3 /t；
Gamma is the volume weight (apparent relative density) of the coal, t/m 3 ；
r 1 The drilling radius, m;
l is the length of the coal hole section of the drilling hole, and m.
In the above formula, the calculation formula of the original gas pressure p of the coal seam related by the invention is as follows:
wherein: a is ash content of a coal sample,%;
m is the water content of the coal sample,%;
a is the gas adsorption constant, m 3 /t；
b is the gas adsorption constant, MPa -1 。
In the above formula, the dimensionless parameters x, n and m related to the invention are determined according to the following formula:
when 0< Q.t.ltoreq.200, x=1, n=1.61, m=1/1.64;
when 200< Q.t.ltoreq.1000, x=1, n=1.39, m=1/2.56;
when 1000< Q.t.ltoreq.7350, x=1.1, n=1.25, m=0.25;
when 7350 is smaller than Q.f and smaller than or equal to 6.5X10 4 When x=1.83, n=1.14, m=1/7.3;
when 6.5×10 4 ＜Q·t≤3.3×10 6 When x=2.1, n=1.11, m=1/9;
when Q.t > 3.3X10 6 When x=3.14, n=1.07, m=1/14.4;
the unit of Q.t in the above judgment condition is (ml.d)/min.
An automatic measuring device for the permeability coefficient of a coal seam comprises an intrinsic safety cavity, wherein an aviation socket and a self-resetting waterproof dustproof key are arranged on one side of the intrinsic safety cavity; a singlechip is arranged in the intrinsic safety cavity, a touch screen is arranged on the outer side surface of the intrinsic safety cavity, and the touch screen is connected with the singlechip through a wire row;
the air inlet ball valve and the air outlet ball valve are respectively arranged at the air inlet and the air outlet of the intrinsic safety cavity, the air outlet of the air inlet ball valve is connected with the air outlet of the air outlet ball valve through an explosion-proof air pipe arranged in the intrinsic safety cavity, and an electronic flow sensor I and an electronic flow sensor II are sequentially arranged on the explosion-proof air pipe; the self-resetting waterproof dustproof key, the electronic flow sensor I and the electronic flow sensor II are all connected to the singlechip through flat cables, and the singlechip is connected to the touch screen through flat cables;
the singlechip carries on bluetooth module and storage module, and measurement data can be stored, can send the survey data result to other bluetooth equipment through bluetooth.
In order to ensure accurate data, the invention uses two electronic flow sensors I and II with different measuring ranges to test the gas flow, wherein the measuring range of the electronic flow sensor I is 0-10000mL/min, the accuracy is 2.5% F.S, and the pressure resistance limit is 2MPa; the measuring range of the electronic flow sensor II is 0-1000mL/min, the precision is 2.5% F.S, and the pressure resistance limit is 2MPa.
In order to improve the intelligent measurement and control of the invention, the singlechip used by the device is provided with 2 MOS chips, and can realize the power-on and power-off control of 4 peripheral devices.
Compared with the prior art, the invention sets the singlechip, the electronic flow sensor I and the electronic flow sensor II, the signal connecting wire and the explosion-proof air pipe in the intrinsic safety cavity, collects the gas flow detected by the electronic flow sensor I and the electronic flow sensor II by the singlechip, displays the collected flow value by the LCD touch screen, switches the electronic flow sensor I and the electronic flow sensor II by the MOS pipe on the singlechip after sensing the gas in different flow ranges, calculates the measured data by the singlechip by the built-in algorithm, stores the calculated result in the SD card, and can also transmit the calculated result to other equipment by Bluetooth. The invention can realize automatic, high-precision and rapid measurement of the coal seam permeability coefficient, and can greatly improve the accuracy and the efficiency of coal seam permeability coefficient measurement.
Drawings
FIG. 1 is a schematic view of the structure of an measuring apparatus of the present invention;
FIG. 2 is a schematic illustration of the internal structure of FIG. 1 with the touch screen removed;
fig. 3 is a cross-sectional view at A-A of fig. 1.
In the figure: 1. from waterproof dustproof button that resets, 2, air inlet ball valve, 3, air outlet ball valve, 4, aviation plug, 5, this ampere of chamber, 6, touch-sensitive screen, 7, circuit, 8, singlechip, 9, electronic flow sensor I, 10, explosion-proof trachea, 11, electronic flow sensor II.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-3, an automated determination method for the permeability coefficient of a coal seam comprises the following steps:
(1) connecting a gas drilling discharge pipe to an inlet of an air inlet ball valve 2, connecting an external power supply to an aviation socket by using an aviation plug 4 to supply power to the device, detecting gas path connection to ensure that the gas path connection is correct, opening the air inlet ball valve 2 and an air outlet ball valve 3, clicking a touch screen 6 to enter a corresponding coal seam air permeability coefficient measuring functional interface, inputting a relevant coefficient of a measured coal seam, and clicking to start measuring after the input is finished to enter a measuring stage;
(2) in the measuring process, the electronic flow sensor I9 and the electronic flow sensor II 11 transmit the flow values measured by the electronic flow sensor I9 and the electronic flow sensor II to the singlechip 8 through the circuit 7;
(3) after the measurement is started, the on-board MOS tube is regulated by the singlechip 8, only the power supply of the electronic flow sensor I9 is started, the power supply of the electronic flow sensor II 11 is disconnected, and when the gas flow sensed by the electronic flow sensor I9 is less than 1000mL/min, the power supply of the electronic flow sensor I9 is disconnected, and meanwhile, the power supply of the flow sensor II 11 is started;
(4) in the measurement process, a certain gas flow is measured every 4 hours before 48 hours, and a certain gas flow is measured every 6 hours after 48 hours; when the electronic flow sensor I9 and the electronic flow sensor II 11 do not perform flow measurement, automatically disconnecting the power supply of equipment except the singlechip 8, and recovering the power supply when waiting for the next measurement;
(5) in the measurement process of the step (4), the duration of each measurement is 5 minutes, the flow data is recorded every minute, and the jth measurement data is recorded as q ij (i=1, 2,3,4, 5), where i represents 5 points of each measurement data; each measurement uses the average value of the gas flow as the result of the measurement, and the average value is recorded as Calculating the average change rate of the gas flow measured before and after, and recording as +.> Continuously measuring until the average change rate of the gas flow is less than 10%, stopping measuring the gas flow data, and recording the average value Q of the gas flow measured last time;
(6) after drilling gas flow measurement is completed, the system utilizes a preset coal bed gas migration dynamics model to fit and calculate the coal bed gas permeability coefficient according to the recorded last gas flow average value Q;
(7) after the calculation flow is finished, confirming to store data, switching off a power supply, closing the air inlet ball valve 2, closing the air outlet ball valve (3) and preventing sundries from entering a pipeline system;
(8) the measurement data can be viewed on a computer through the SD memory card or sent to other devices through Bluetooth.
The coal bed gas migration dynamics model of the invention is as follows:
wherein: lambda is the permeability coefficient of the coal bed, m 2 /(MPa 2 ·d)；
Q is the average value of the gas flow rate measured last time, m 3 /d；
x, n, m are dimensionless parameters, and automatic assignment is judged by the inside of the calculation program;
p is the original gas pressure of the coal bed and MPa;
t is the time interval from the beginning of gas discharge of the drill hole to the end of gas flow measurement, d;
x is the gas content of the coal seam, m 3 /t；
Gamma is the volume weight (apparent relative density) of the coal, t/m 3 ；
r 1 The drilling radius, m;
l is the length of the coal hole section of the drilling hole, and m.
In the above formula, the calculation formula of the original gas pressure p of the coal seam is:
wherein: a is ash content of a coal sample,%;
m is the water content of the coal sample,%;
a is the gas adsorption constant, m 3 /t；
b is the gas adsorption constant, MPa -1 。
In the above formula, the dimensionless parameters x, n, m are determined as follows:
when 0< Q.t.ltoreq.200, x=1, n=1.61, m=1/1.64;
when 200< Q.t.ltoreq.1000, x=1, n=1.39, m=1/2.56;
when 1000< Q.t.ltoreq.7350, x=1.1, n=1.25, m=0.25;
when 7350 is smaller than Q.f and smaller than or equal to 6.5X10 4 When x=1.83, n=1.14, m=1/7.3;
when 6.5×10 4 ＜Q·t≤3.3×10 6 When x=2.1, n=1.11, m=1/9;
when Q.t > 3.3X10 6 When x=3.14, n=1.07, m=1/14.4;
the unit of Q.t in the above judgment condition is (ml.d)/min.
An automatic measuring device for the permeability coefficient of a coal seam comprises an intrinsic safety cavity 5 and an aviation socket 4, wherein the device is connected with an aviation power supply through the aviation socket 4 to supply power to the whole device; the self-resetting waterproof and dustproof key 1 is arranged on one side of the intrinsic safety cavity 5, and the self-resetting waterproof and dustproof key 1 is internally provided with the sealing rubber tab piece, so that waterproof and dustproof effects can be realized, when the self-resetting waterproof and dustproof key 1 is bounced, the tab piece can automatically close a key gap to prevent liquid and dust from entering, and when the self-resetting waterproof and dustproof key 1 is pressed, the key gap can be opened to allow triggering of clicking actions;
a singlechip 8 is arranged in the intrinsic safety cavity 5, a touch screen 6 is arranged on the outer side surface of the intrinsic safety cavity 5, and the touch screen 6 is connected with the singlechip 8 through a wire row 7; the experiment parameters can be input or the experiment opening and closing program can be controlled by clicking the touch screen 6;
the air inlet ball valve 2 and the air outlet ball valve 3 are respectively arranged at the air inlet and the air outlet of the intrinsic safety cavity 5, the air outlet of the air inlet ball valve 2 is connected with the air outlet of the air outlet ball valve 3 through an explosion-proof air pipe 10 arranged in the intrinsic safety cavity 5, an electronic flow sensor I9 and an electronic flow sensor II 11 are sequentially arranged on the explosion-proof air pipe 10, the measuring ranges of the electronic flow sensor I9 and the electronic flow sensor II 11 are different, the measuring range of the electronic flow sensor I9 is 0-10000mL/min, the precision is 2.5 percent F.S, and the pressure resistance limit is 2MPa; the measuring range of the electronic flow sensor II 11 is 0-1000mL/min, the precision is 2.5% F.S, and the pressure resistance limit is 2MPa; the air inlet of the air inlet ball valve 2 is connected with an air inlet pipeline, the air outlet of the air inlet ball valve 2 is connected with the air inlet of the electronic flow sensor I9 through the explosion-proof air pipe 10, the air outlet of the electronic flow sensor I9 is connected with the air inlet of the electronic flow sensor II 11 through the explosion-proof air pipe 10, and the air outlet of the electronic flow sensor II 11 is connected with the air outlet ball valve 3 through the explosion-proof air pipe 10;
according to the self-resetting waterproof dustproof key 1, the electronic flow sensor I9 and the electronic flow sensor II 11 are all connected to the single chip microcomputer 8 through the flat cable 7, the single chip microcomputer 8 is connected to the touch screen 6 through the flat cable, and the on-off of the power supplies of the electronic flow sensor I9 and the electronic flow sensor II 11 are controlled through the MOS tube on the single chip microcomputer 8;
the single chip microcomputer 8 is provided with a Bluetooth module and a storage module, can store measurement data, and can send measurement data results to other Bluetooth devices through Bluetooth.
The singlechip 8 board that this device used has carried 2 MOS chips, can realize the power on and outage control to 4 peripheral hardware power
The singlechip 8 is an existing singlechip control system, can be matched with the measuring device of the application to solve the technical problem of the application and achieve the technical effect of the application.
Examples:
an automatic determination method for the permeability coefficient of a coal seam comprises the following steps:
taking a No. 1 measuring point of a working face of a No. 4 coal seam of a certain mine as an example, the specific implementation steps are as follows:
(1) the gas drilling discharge pipe is connected to the inlet of the air inlet ball valve 2, the external power supply is connected to the aviation socket by using the aviation plug 4 to supply power to the device, the connection of the air paths is detected to ensure that the connection of the air paths is correct, the air inlet ball valve 2 and the air outlet ball valve 3 are opened, the touch screen 6 is opened to enter a corresponding coal seam air permeability coefficient measuring functional interface, and relevant parameters of a coal seam to be measured are input, wherein the relevant parameters are shown in a table 1.
Table 1 correlation coefficient of 1 st station coal seam on working face of 4# coal seam of some ore in shanxi
| Parameters (parameters) | Value of |
| X | 3.294 |
| γ | 1.12 |
| r 1 | 0.05 |
| A | 2.02 |
| M | 12.01 |
| a | 50.467 |
| b | 0.179 |
| L | 20 |
After the input of the parameters is finished, starting to enter a measuring stage;
(2) in the measuring process, the electronic flow sensor I9 and the electronic flow sensor II 11 transmit the flow values measured by the electronic flow sensor I9 and the electronic flow sensor II to the singlechip 8 through the circuit 7;
(3) after the measurement is started, the on-board MOS tube is regulated by the singlechip 8, only the power supply of the electronic flow sensor I9 is started, the power supply of the electronic flow sensor II 11 is disconnected, and when the gas flow sensed by the electronic flow sensor I9 is less than 1000mL/min, the power supply of the electronic flow sensor I9 is disconnected, and meanwhile, the power supply of the flow sensor II 11 is started;
(4) in the measurement process, the gas flow is measured every 4 hours for the first 48 hours, and the gas flow is measured every 6 hours after waiting for 48 hours; when the electronic flow sensor does not measure the flow, automatically disconnecting the power supply of equipment except the singlechip 8, and recovering the power supply when waiting for the next measurement;
(5) each measurement was 5 minutes in duration, flow data was recorded every minute, and the jth measurement data was recorded as q ij (j=1, 2,3,4, 5); each measurement uses the average value of the gas flow as the result of the measurement, and the average value is recorded as Calculating the average change rate of the gas flow measured before and after, and recording as +.> Continuously measuring until the average change rate of the gas flow is less than 10%, stopping measuring the gas flow data, recording the average value Q of the gas flow measured last time as 105mL/min, and recording the time interval t from the beginning of gas discharge of the drilling to the end of gas flow measurement as 15d;
(6) according to the recorded last gas flow average value Q, the system automatically takes the dimensionless parameters as x=1.1, n=1.25 and m=0.25 by an internal calculation program, and simultaneously automatically calculates the coal seam permeability coefficient as 0.00022709m by utilizing a preset coal seam gas migration dynamics model 2 /(MPa 2 ·d)；
(7) After the calculation flow is finished and the data is confirmed to be stored, the power supply is disconnected, the air inlet ball valve 2 is closed, the air outlet ball valve 3 is closed, and sundries are prevented from entering the pipeline system; preventing sundries from entering the pipeline system;
(8) the measurement data can be viewed on a computer through the SD memory card or sent to other devices through Bluetooth.
Claims (7)
1. An automatic determination method for the permeability coefficient of a coal seam is characterized by comprising the following steps:
(1) connecting a gas drilling discharge pipe to an inlet of an air inlet ball valve (2), connecting an external power supply to an aviation socket by using an aviation plug (4) to supply power to the device, detecting gas path connection to ensure that the gas path connection is correct, opening the air inlet ball valve (2) and an air outlet ball valve (3), opening a touch screen (6) to enter a corresponding coal seam air permeability coefficient measuring functional interface, inputting a relevant coefficient of a measured coal seam, and clicking to start measuring after the input is finished to enter a measuring stage;
(2) in the measuring process, the electronic flow sensor I (9) and the electronic flow sensor II (11) transmit the flow values measured by the electronic flow sensor I and the electronic flow sensor II to the singlechip (8) through the circuit (7);
(3) after the measurement is started, the on-board MOS tube is regulated by the singlechip (8), only the power supply of the electronic flow sensor I (9) is started, the power supply of the electronic flow sensor II (11) is disconnected, and when the gas flow sensed by the electronic flow sensor I (9) is less than 1000mL/min, the power supply of the electronic flow sensor I (9) is disconnected, and meanwhile, the power supply of the electronic flow sensor II (11) is started;
(4) in the measurement process, a certain gas flow is measured every 4 hours before 48 hours, and a certain gas flow is measured every 6 hours after 48 hours; when the electronic flow sensor I (9) and the electronic flow sensor II (11) do not perform flow measurement, automatically disconnecting power supply of equipment except the singlechip (8), and recovering power supply when waiting for the next measurement;
(5) in the measurement process of the step (4), the duration of each measurement is 5 minutes, the flow data is recorded every minute, and the jth measurement data is recorded as q ij (i=1, 2,3,4, 5); each measurement uses the average value of the gas flow as the result of the measurement, and the average value is recorded as Calculating the average change rate of the gas flow measured before and after, and recording as +.> Continuously measuring until the average change rate of the gas flow is less than 10%, stopping measuring the gas flow data, and recording the average value Q of the gas flow measured last time;
(6) after drilling gas flow measurement is completed, the system utilizes a preset coal bed gas migration dynamics model to fit and calculate the coal bed gas permeability coefficient according to the recorded last gas flow average value Q;
(7) after the calculation flow is finished, confirming to store data, switching off a power supply, closing an air inlet ball valve (2), closing an air outlet ball valve (3), and preventing sundries from entering a pipeline system;
(8) the measurement data can be viewed on a computer through the SD memory card or sent to other devices through Bluetooth.
2. The automated determination method of the permeability coefficient of the coal seam according to claim 1, wherein the gas migration dynamics model of the coal seam is:
wherein: lambda is the permeability coefficient of the coal seam;
q is the average value of the gas flow measured in the last time;
x, n, m are dimensionless parameters;
p is the original gas pressure of the coal bed;
t is the time interval from the beginning of gas discharge from the drilling hole to the end of gas flow measurement;
x is the gas content of the coal seam;
gamma is the volume weight of the coal;
r 1 is the drilling radius;
l is the length of the coal hole section of the drilling hole.
3. The automated determination method of the permeability coefficient of the coal seam according to claim 2, wherein the calculation formula of the original gas pressure p of the coal seam is:
wherein: a is ash of a coal sample;
m is the moisture of the coal sample;
a is the gas adsorption constant;
b is the gas adsorption constant.
4. An automated determination of a permeability coefficient for a coal seam according to claim 2, wherein the dimensionless parameters x, n, m are determined according to the following formula:
when 0<Q.t is less than or equal to 200, x=1, n=1.61, m=1/1.64;
when 200< Q.t is less than or equal to 1000, x=1, n=1.39, m=1/2.56;
when 1000< q·t is less than or equal to 7350, x=1.1, n=1.25, m=0.25;
when 7350<Q·t≤6.5×10 4 When x=1.83, n=1.14, m=1/7.3;
when 6.5×10 4 <Q·t≤3.3×10 6 When x=2.1, n=1.11, m=1/9;
when Q.t>3.3×10 6 When x=3.14, n=1.07, m=1/14.4.
5. An automatic measuring device for the air permeability coefficient of a coal seam for realizing the method of the claim is characterized by comprising a An Qiang (5), an aviation socket (4) and a self-resetting waterproof and dustproof key (1) are arranged on one side of the An Qiang (5), a singlechip (8) is arranged in the An Qiang (5), a touch screen (6) is arranged on the outer side surface of the An Qiang (5), and the touch screen (6) is connected with the singlechip (8) through a wire row (7);
the air inlet ball valve (2) and the air outlet ball valve (3) are respectively arranged at the air inlet and the air outlet of the ball valve An Qiang (5), the air outlet of the ball valve (2) is connected with the air outlet of the air outlet ball valve (3) through an explosion-proof air pipe (10) arranged in the ball valve An Qiang (5), and an electronic flow sensor I (9) and an electronic flow sensor II (11) are sequentially arranged on the explosion-proof air pipe (10);
the self-resetting waterproof dustproof key (1), the electronic flow sensor I (9) and the electronic flow sensor II (11) are all connected to the singlechip (8) through the flat cable (7), and the singlechip (8) is connected to the touch screen (6) through the flat cable; the singlechip (8) is provided with a Bluetooth module and a storage module.
6. The automatic determination device for the permeability coefficient of the coal seam according to claim 5, wherein the electronic flow sensor I (9) and the electronic flow sensor II (11) are different in measuring range, the electronic flow sensor I (9) is 0-10000mL/min in measuring range, the accuracy is 2.5% F.S, and the pressure-resistant limit is 2MPa; the measuring range of the electronic flow sensor II (11) is 0-1000mL/min, the precision is 2.5% F.S, and the pressure resistance limit is 2MPa.
7. The automatic determination device for the permeability coefficient of the coal seam according to claim 5, wherein the singlechip (8) is provided with 2 MOS chips on board, and can realize power-on and power-off control of 4 peripheral devices.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411868A (en) * | 2013-07-25 | 2013-11-27 | 陕西煤业化工技术研究院有限责任公司 | Measuring method for coal seam gas permeability coefficient |
| CN103925950A (en) * | 2014-05-13 | 2014-07-16 | 樊梦战 | Multifunctional gas parameter measuring device and using method thereof |
| CN113266315A (en) * | 2021-06-17 | 2021-08-17 | 中国矿业大学 | Method for determining permeability coefficient of coal seam |
| CN219737174U (en) * | 2023-02-13 | 2023-09-22 | 淮北矿业股份有限公司 | Device for measuring anisotropic permeability coefficient of bedding drilling coal bed |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411868A (en) * | 2013-07-25 | 2013-11-27 | 陕西煤业化工技术研究院有限责任公司 | Measuring method for coal seam gas permeability coefficient |
| CN103925950A (en) * | 2014-05-13 | 2014-07-16 | 樊梦战 | Multifunctional gas parameter measuring device and using method thereof |
| CN113266315A (en) * | 2021-06-17 | 2021-08-17 | 中国矿业大学 | Method for determining permeability coefficient of coal seam |
| CN219737174U (en) * | 2023-02-13 | 2023-09-22 | 淮北矿业股份有限公司 | Device for measuring anisotropic permeability coefficient of bedding drilling coal bed |
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