CN114136864B - Method, storage medium and system for determining permeability of coal and rock - Google Patents
Method, storage medium and system for determining permeability of coal and rock Download PDFInfo
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- CN114136864B CN114136864B CN202111600352.7A CN202111600352A CN114136864B CN 114136864 B CN114136864 B CN 114136864B CN 202111600352 A CN202111600352 A CN 202111600352A CN 114136864 B CN114136864 B CN 114136864B
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- 239000003245 coal Substances 0.000 title claims abstract description 145
- 239000011435 rock Substances 0.000 title claims abstract description 88
- 230000035699 permeability Effects 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003860 storage Methods 0.000 title claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 70
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000010998 test method Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 79
- 238000012806 monitoring device Methods 0.000 description 10
- 239000002002 slurry Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 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
- G01N15/082—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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Abstract
The invention provides a method for determining coal rock permeability, a storage medium and a system, wherein the method for determining the coal rock permeability comprises the following steps: acquiring a test coal sample, perforating at the center of the test coal sample, and sealing the upper surface and the lower surface of the perforation; placing the test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring the gas pressure value in the closed space and the gas pressure value in the hole when the gas pressure value in the hole is monitored to be constant; and determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole. The invention solves the technical problems of complex operation and low test precision of the coal rock permeability test method in the prior art. By adopting the method for determining the permeability of the coal rock, the difficulty in testing the permeability of the coal rock is reduced, and the accurate determination of the permeability of the coal rock is realized.
Description
Technical Field
The invention relates to the field of coal, in particular to a method, a storage medium and a system for determining coal rock permeability.
Background
Along with the deep progress of coal mining and coal bed gas resource development, in the production process of coal mining and coal bed gas, the permeability of coal and rock continuously changes along with the coal mining and the coal bed gas production, and accurate measurement of the permeability of coal and rock is particularly important for the mining of coal mine and coal bed gas.
An existing method for measuring the permeability of coal and rock comprises the following steps: s1: manufacturing a test block, and reserving grouting holes and sensor embedded measuring points on the test block; s2: symmetrically burying the sensors into test blocks, connecting the sensors to a data acquisition device, and connecting the data acquisition device with a computer; s3: fixing the test block on a test block clamping and pressure adding device, and connecting the test block clamping and pressure adding device to a pressure controller; s4: inserting the grouting pipe into the test block, fixing the grouting pipe at the bottom end of the test block clamping and pressure holding device, screwing a sealing ring, closing a three-way valve, and connecting a grouting pump; s5: adjusting the pressure controller to a set pressure; s6: opening a grouting pump switch, opening a three-way valve, and injecting slurry into the test block through a grouting pipe; s7: stopping grouting when the pressure gauge reaches the set pressure, and closing the three-way valve; s8: and collecting the pressure difference P and the time t when the slurry permeates to the depth of the pore crack L of the coal rock mass, and calculating the permeation curve of the slurry and the permeability of the coal rock.
The existing coal rock permeability measuring method needs to manufacture a test block, a sensor is embedded in the test block, the pressure difference P and the time t when slurry permeates to the depth of the coal rock pore crack L are collected, and the permeability curve of the slurry and the coal rock permeability are calculated. The existing scheme is complex to operate, and factors influencing the permeability, such as the permeation condition, pressure, time and the like of slurry, are more, so that the measurement accuracy of the permeability is insufficient in the specific practice of the existing scheme.
Disclosure of Invention
Based on the problems, the invention provides a method, a storage medium and a system for determining the permeability of coal and rock, which solve the technical problems of complex operation and low test precision of the coal and rock permeability test method in the prior art. By adopting the method for determining the permeability of the coal rock, the difficulty in testing the permeability of the coal rock is reduced, and the accurate determination of the permeability of the coal rock is realized.
The invention provides a method for determining coal rock permeability, which comprises the following steps:
acquiring a test coal sample, perforating at the center of the test coal sample, and sealing the upper surface and the lower surface of the perforation;
placing the test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring the gas pressure value in the closed space and the gas pressure value in the hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole.
In addition, gas is applied to the closed space for a plurality of times to make the air pressure value in the closed space different, and the air pressure value in the hole is respectively obtained when the air pressure value in the hole is constant;
the air pressure values in different holes correspond to different coal-rock permeabilities, and the minimum value is selected as the coal-rock permeabilities.
In addition, determining the coal rock permeability from the air pressure value in the enclosed space and the air pressure value in the hole includes:
wherein mu 0 For applying the viscosity of the gas, r is the radius of the bottom surface of the test coal sample, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 And the corresponding air pressure value in the hole, K is the permeability of the coal and the rock.
Wherein the viscosity of the applied gas = the density ρ of the applied gas 0 * Velocity V of applied gas 0 * Mean free path.
In addition, determining the coal rock permeability from the air pressure value in the enclosed space and the air pressure value in the hole includes:
μ 0 to apply the viscosity of the gas, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 And the corresponding air pressure value in the hole, K is the permeability of the coal and the rock.
In addition, determining the coal rock permeability from the air pressure value in the enclosed space and the air pressure value in the hole includes:
μ 0 to apply the viscosity of the gas, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 And t is the time length from when the pressure value of the gas applied in the closed space becomes any pressure value to when the pressure value in the hole corresponding to any pressure value is monitored to be constant, and K is the coal rock permeability.
In addition, the method for judging the constant air pressure value in the hole comprises the following steps:
constructing a rectangular coordinate system;
obtaining stress of the hole in the transverse axis direction of the rectangular coordinate system to obtain transverse stress;
obtaining stress of the center of the test coal sample in the longitudinal axis direction of the rectangular coordinate system to obtain longitudinal stress;
if the change delta P of the front and rear air pressure values in the hole is monitored to be less than the min { alpha, (epsilon 1-epsilon 2) 2*T rho 0 (1-V0) 2/2 pi r1h, the air pressure value in the hole is judged to be constant;
wherein ε 1 is the transverse stress, ε 2 is the longitudinal stress, ρ 0 To apply the density of the gas, V 0 For applying the flow rate of the gas r 1 And h is the radius of the hole, h is the height of the tested coal sample, alpha is a preset change threshold, T is the temperature of the closed space, and delta P is the current monitored air pressure value minus the air pressure value monitored at the previous moment.
In addition, the test coal sample was cylindrical.
In addition, a round hole is formed in the center of the test coal sample.
The invention also proposes a storage medium storing computer instructions for performing the method of determining permeability of coal rock of any one of the above, when the computer executes the computer instructions.
The invention also provides a coal pillar width determining system, which comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
acquiring a test coal sample, perforating at the center of the test coal sample, and sealing the upper surface and the lower surface of the perforation;
placing the test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring the gas pressure value in the closed space and the gas pressure value in the hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole.
The invention solves the technical problems of complex operation and low test precision of the coal rock permeability test method in the prior art. By adopting the method for determining the permeability of the coal rock, the difficulty in testing the permeability of the coal rock is reduced, and the accurate determination of the permeability of the coal rock is realized.
Drawings
FIG. 1 is a flow chart of a method for determining permeability of coal rock according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining a constant air pressure in a hole according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the coordinate system in fig. 2.
Detailed Description
The invention is described in further detail below with reference to the specific embodiments and the accompanying drawings. It is intended that the invention be limited only by the specific embodiments illustrated and not by any means, but that it is intended that the invention be limited only by the terms of the appended claims.
Referring to fig. 1, the invention provides a method for determining coal rock permeability, which comprises the following steps:
s001, acquiring a test coal sample, perforating at the center of the test coal sample, and sealing the upper surface and the lower surface of the perforation;
step S002, placing the test coal sample in a constant-temperature closed space, applying gas to the closed space, and acquiring the air pressure value in the closed space and the air pressure value in the hole when the air pressure value in the hole is monitored to be constant;
and S003, determining the coal rock permeability K according to the air pressure value in the closed space and the air pressure value in the hole.
In step S001, a part of coal rock is acquired as a test coal sample, and optionally, the acquired test coal sample is cylindrical. The height of the cylinder, i.e. the height of the test coal sample, is denoted as h 3 The radius of the bottom surface of the cylinder, i.e. the radius of the bottom surface of the test coal sample, is denoted as r. Optionally, the hole is a round hole to facilitate drilling.
In step S002, a hole is opened at the center of the test coal sample and the upper and lower surfaces of the hole are sealed.
For example, a radius r is arranged at the center of the test coal sample 1 Is also h 3 The holes are used for gas seepage, and the upper surface and the lower surface of the holes are sealed by films.
In addition, an air pressure monitoring device is connected to the aperture. Specifically, the air pressure monitoring device can be placed in the hole, the hole and the air pressure monitoring device can be also connected through the hollow pipeline, and the air in the hole is transmitted to the air pressure monitoring device through the hollow pipeline, so that the air pressure monitoring device measures the air pressure value of the transmitted air.
In step S003, a gas is applied to the test coal sample, and the gas pressure value in the hole is monitored. The air pressure value in the hole is monitored by an air pressure monitoring device. The method can be realized by the following steps:
1) And placing the test coal sample in a constant-temperature closed space. Alternatively, the constant temperature (T) is 20 degrees celsius.
2) A gas is applied to the closed space, and the gas pressure value of the gas is adjusted. The gas here may be helium, or other gases, and the embodiment is not particularly limited to the applied gas.
3) And monitoring the change of the air pressure value in the hole by an air pressure monitoring device aiming at each air pressure value of the applied air, and correspondingly recording the air pressure value in the hole and the air pressure value in the closed space at the moment when the air pressure value in the hole is constant.
By measuring both air pressure values, preparation is made for subsequent calculations.
The invention solves the technical problems of complex operation and low test precision of the coal rock permeability test method in the prior art. By adopting the method for determining the permeability of the coal rock, the difficulty in testing the permeability of the coal rock is reduced, and the accurate determination of the permeability of the coal rock is realized.
In one embodiment, applying gas to the closed space for a plurality of times to make the air pressure values in the closed space different, and respectively obtaining the air pressure values in the holes when the air pressure values in the holes are constant;
the air pressure values in different holes correspond to different coal-rock permeabilities, and the minimum value is selected as the coal-rock permeabilities K.
After the test coal sample is placed in a constant temperature closed space, a gas (the gas pressure of the gas is as follows) At this time, the air pressure monitoring device monitors the change of the air pressure value in the hole, if the current air pressure value is monitored to be constant (such as) Then the air pressure in the hole at this time is increased (e.g.)>) As the value of the gas pressure in the hole corresponding to the current value of the gas pressure applied. Then, the air pressure value of the air applied in the closed space is adjusted to +>After the adjustment, the air pressure value change in the hole is monitored again by the air pressure monitoring device, if the current air pressure value is monitored to be constant (such as +.>) Then the air pressure in the hole at this time is increased (e.g.)>) As the gas pressure value in the hole corresponding to the current gas pressure value of the applied gas. And so on until all the air pressure values of the applied air in the closed space are obtained corresponding air pressure values in the holes.
The air pressure value is adjusted several times by applying air in the closed space, and the air pressure value is preset, so that the embodiment does not need to be required.
Since the obtained gas pressure value in each of the plurality of holes corresponds to the gas pressure value of one applied gas, the coal rock permeability is determined based on the gas pressure value of each set of applied gas and the gas pressure value in the corresponding hole. That is, the coal rock permeability corresponding to each gas pressure value is determined based on each gas pressure value of the applied gas and the gas pressure value in the hole corresponding to each gas pressure value, resulting in the coal rock permeability at different gas pressure values.
And finally, selecting the minimum coal rock permeability as the coal rock permeability K from the obtained coal rock permeabilities at different air pressure values.
And obtaining the optimal and most accurate coal rock permeability through multiple tests.
The coal rock permeability calculation formula has a plurality of calculation formulas, and one calculation can be adopted.
In one embodiment, determining the coal rock permeability from the air pressure value in the enclosed space and the air pressure value in the hole comprises:
wherein mu 0 For applying the viscosity of the gas, r is the radius of the bottom surface of the test coal sample, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 The corresponding air pressure value in the hole;
wherein the viscosity of the applied gas = the density ρ of the applied gas 0 * Velocity V of applied gas 0 * Mean free path.
In one embodiment, determining the coal rock permeability from the air pressure value in the enclosed space and the air pressure value in the hole comprises:
μ 0 to apply the viscosity of the gas, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 The corresponding air pressure value in the hole.
In one embodiment, determining the coal rock permeability from the air pressure value in the enclosed space and the air pressure value in the hole comprises:
μ 0 to apply the viscosity of the gas, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 And t is the time length from when the pressure value of the gas applied in the closed space becomes any pressure value to when the pressure value in the hole corresponding to any pressure value is monitored to be constant.
If t=the current air pressure value is monitored to be constantTime of (1) adjusting the gas pressure value of the gas applied in the closed space to +.>Is a time of (a) to be used.
Referring to fig. 2, in one embodiment, the method for determining that the air pressure value in the hole is constant is as follows:
step S201, constructing a rectangular coordinate system; as shown in fig. 3.
Step S202, obtaining stress of the hole in the transverse axis direction of a rectangular coordinate system to obtain transverse stress;
step S203, obtaining stress of the center of the test coal sample in the longitudinal axis direction of the rectangular coordinate system, and obtaining longitudinal stress;
step S204, if the change delta P < min { alpha, (epsilon 1-epsilon 2) 2*T rho 0 (1-V0) 2/2 pi r1h of the front and rear air pressure values in the hole is monitored, judging that the air pressure value in the hole is constant;
wherein ε 1 is the transverse stress, ε 2 is the longitudinal stress, ρ 0 To apply the density of the gas, V 0 For applying the flow rate of the gas r 1 And h is the radius of the hole, h is the height of the tested coal sample, alpha is a preset change threshold, T is the temperature of the closed space, and delta P is the current monitored air pressure value minus the air pressure value monitored at the previous moment.
In step S201, a rectangular coordinate system is constructed. The round point of the rectangular coordinate system is the center point of the bottom surface of the cylindrical test coal sample, the transverse axis of the rectangular coordinate system is the extension of any radius of the bottom surface of the cylindrical test coal sample, and the longitudinal axis of the rectangular coordinate system is the high extension of the cylindrical test coal sample. As shown in fig. 2, o is a dot, x is a horizontal axis, and y is a vertical axis.
In step S202, the stress in the hole in the transverse axis direction of the rectangular coordinate system is obtained, and the transverse stress is obtained.
In step S203, the stress of the center of the test coal sample in the longitudinal axis direction of the rectangular coordinate system is obtained, and the longitudinal stress is obtained.
In specific implementation, a stress sensor (such as a transverse strain gauge and a longitudinal strain gauge) can be added into the hole to obtain transverse stress and longitudinal stress.
In step S204, if the change Δp < min { α, (ε 1- ε 2) × 2*T ×ρ0 (1-V0) 2/2ρr1h of the two air pressure values is detected, the air pressure value in the hole is determined to be constant.
Wherein ε 1 is the transverse stress, ε 2 is the longitudinal stress, ρ 0 To apply the density of the gas, V 0 For applying the flow rate of the gas r 1 The radius of the hole is h, the height of the tested coal sample is h, alpha is a preset change threshold value, and T is the temperature of the closed space, such as 30 ℃.
ρ 0 、V 0 The measurement may be obtained by measurement, and the measurement scheme is an existing scheme, which is not limited herein.
Δp is the current air pressure value of the air pressure monitoring device-the current air pressure value of the air pressure monitoring device at the previous time.
The previous time may be one second or one minute, and the interval between the previous time and the previous time is preset, which is not limited in this embodiment.
The α may be set according to an empirical value or may be obtained by analyzing big data, and the determination method and specific value of α are not limited in this embodiment.
The step is not to fix a judging standard for constant air pressure value, and dynamically obtaining the standard for constant air pressure value according to different coal rock conditions, wherein the change of front and rear air pressure values for constant air pressure value is in direct proportion to the flow rate of the applied gas when the transverse stress is different from the longitudinal stress, and the change of the applied gas is in inverse proportion to the height of the tested coal sample and the radius of the hole.
Taking the density of the applied gas as an example, the larger the density, the larger the change of the front and rear air pressure values is, the more the air pressure value is determined to be constant, and the smaller the density, the smaller the change of the front and rear air pressure values is, the more the air pressure value is determined to be constant.
By means of dynamic constant judgment of the air pressure value, accurate judgment can be carried out according to the current applied air condition and the tested coal sample.
In one embodiment, the test coal sample is a cylinder. In order to facilitate the sampling of the mould, the test coal sample is made to be a cylinder.
In one embodiment, a round hole is formed in the center of the test coal sample. In order to facilitate drilling, a round hole is formed in the center of the test coal sample.
The invention also proposes a storage medium storing computer instructions for performing the method of determining permeability of coal rock of any one of the above, when the computer executes the computer instructions.
The invention also provides a coal pillar width determining system, which comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
acquiring a test coal sample, perforating at the center of the test coal sample, and sealing the upper surface and the lower surface of the perforation;
placing the test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring the gas pressure value in the closed space and the gas pressure value in the hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole.
The invention solves the technical problems of complex operation and low test precision of the coal rock permeability test method in the prior art. By adopting the method for determining the permeability of the coal rock, the difficulty in testing the permeability of the coal rock is reduced, and the accurate determination of the permeability of the coal rock is realized.
What has been described above is merely illustrative of the principles and preferred embodiments of the present invention. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the invention and should also be considered as the scope of protection of the present invention.
Claims (9)
1. A method for determining permeability of coal rock, comprising:
acquiring a test coal sample, perforating at the center of the test coal sample, and sealing the upper surface and the lower surface of the perforation;
placing the test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring the gas pressure value in the closed space and the gas pressure value in the hole when the gas pressure value in the hole is monitored to be constant;
determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole;
applying gas to the closed space for multiple times to make the air pressure values in the closed space different, and respectively obtaining the air pressure values in the holes when the air pressure values in the holes are constant;
the air pressure values in different holes correspond to different coal-rock permeabilities, and the minimum value is selected as the coal-rock permeabilities.
2. The method for determining the permeability of coal rock according to claim 1, wherein,
determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
wherein mu 0 For applying the viscosity of the gas, r is the radius of the bottom surface of the test coal sample, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 The corresponding air pressure value in the hole, K is the permeability of the coal rock;
wherein the viscosity of the applied gas = the density ρ of the applied gas 0 * Velocity V of applied gas 0 * Mean free path.
3. The method for determining the permeability of coal rock according to claim 1, wherein,
determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ 0 to apply the viscosity of the gas, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 And the corresponding air pressure value in the hole, K is the permeability of the coal and the rock.
4. The method for determining the permeability of coal rock according to claim 1, wherein,
determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ 0 to apply the viscosity of the gasDegree, P 2 To apply any value of the gas pressure, P 1 Is equal to P 2 And t is the time length from when the pressure value of the gas applied in the closed space becomes any pressure value to when the pressure value in the hole corresponding to any pressure value is monitored to be constant, and K is the coal rock permeability.
5. The method for determining the permeability of coal rock according to claim 1, wherein,
the method for judging the constant air pressure value in the hole comprises the following steps:
constructing a rectangular coordinate system;
obtaining stress of the hole in the transverse axis direction of the rectangular coordinate system to obtain transverse stress;
obtaining stress of the center of the test coal sample in the longitudinal axis direction of the rectangular coordinate system to obtain longitudinal stress;
if the change delta P of the front and rear air pressure values in the hole is monitored to be less than the min { alpha, (epsilon 1-epsilon 2) 2*T rho 0 (1-V0) 2/2 pi r1h, the air pressure value in the hole is judged to be constant;
wherein ε 1 is the transverse stress, ε 2 is the longitudinal stress, ρ 0 To apply the density of the gas, V 0 For applying the flow rate of the gas r 1 And h is the radius of the hole, h is the height of the tested coal sample, alpha is a preset change threshold, T is the temperature of the closed space, and delta P is the current monitored air pressure value minus the air pressure value monitored at the previous moment.
6. The method for determining the permeability of coal rock according to claim 1, wherein,
the test coal sample is a cylinder.
7. The method for determining the permeability of coal rock according to any one of claims 1 to 6,
and a round hole is formed in the center of the test coal sample.
8. A storage medium storing computer instructions which, when executed by a computer, are adapted to carry out the method of determining permeability of coal rock of any one of claims 1 to 7.
9. A system for determining permeability of coal and rock comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
acquiring a test coal sample, perforating at the center of the test coal sample, and sealing the upper surface and the lower surface of the perforation;
placing the test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring the gas pressure value in the closed space and the gas pressure value in the hole when the gas pressure value in the hole is monitored to be constant;
determining the permeability of the coal and the rock according to the air pressure value in the closed space and the air pressure value in the hole;
applying gas to the closed space for multiple times to make the air pressure values in the closed space different, and respectively obtaining the air pressure values in the holes when the air pressure values in the holes are constant;
the air pressure values in different holes correspond to different coal-rock permeabilities, and the minimum value is selected as the coal-rock permeabilities.
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