CN114136864A - Coal rock permeability determination method, storage medium and system - Google Patents
Coal rock permeability determination method, storage medium and system Download PDFInfo
- Publication number
- CN114136864A CN114136864A CN202111600352.7A CN202111600352A CN114136864A CN 114136864 A CN114136864 A CN 114136864A CN 202111600352 A CN202111600352 A CN 202111600352A CN 114136864 A CN114136864 A CN 114136864A
- Authority
- CN
- China
- Prior art keywords
- pressure value
- gas
- hole
- permeability
- air pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003245 coal Substances 0.000 title claims abstract description 152
- 230000035699 permeability Effects 0.000 title claims abstract description 87
- 239000011435 rock Substances 0.000 title claims abstract description 80
- 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 72
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000010998 test method Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 98
- 238000012806 monitoring device Methods 0.000 description 10
- 239000002002 slurry Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 1
- 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention provides a method, a storage medium and a system for determining coal rock permeability, wherein the method for determining the coal rock permeability comprises the following steps: obtaining a test coal sample, opening a hole in the center of the test coal sample and sealing the upper surface and the lower surface of the hole; placing a test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring a gas pressure value in the closed space and a gas pressure value in a hole when the gas pressure value in the hole is monitored to be constant; and determining the permeability of the coal 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 testing difficulty of 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
With the deep progress of coal mining and coal bed gas resource development, the permeability of the coal rock can be continuously changed along with the coal mining and the production of the coal bed gas in the coal mining and coal bed gas production processes, and the accurate measurement of the permeability of the coal rock is particularly important for the coal mining and the coal bed gas production.
The existing method for measuring the permeability of the coal rock comprises the following steps: s1: manufacturing a test block, reserving a grouting hole and a sensor embedded measuring point on the test block; s2: symmetrically embedding the sensors in the test block, connecting the sensors to a data acquisition device, and connecting the data acquisition device with a computer; s3: fixing the test block on the test block clamping and pressure clamping device, and connecting the test block clamping and pressure clamping device to the pressure controller; s4: inserting a grouting pipe into the test block, fixing the grouting pipe at the bottom end of the test block clamping and pressure adding device, screwing a sealing ring, closing a three-way valve, and switching on 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 a set pressure, and closing the three-way valve; s8: and collecting the pressure difference P and the time t when the slurry penetrates to the depth of the coal rock body pore gap L, and calculating the penetration curve of the slurry and the permeability of the coal rock.
The existing method for measuring the coal rock permeability needs to manufacture a test block, embed a sensor in the test block, collect pressure difference P and time t when slurry permeates to the depth of a coal rock body pore gap L, and calculate the permeability curve of the slurry and the permeability of the coal rock. The existing scheme is complex in operation, and factors influencing the permeability are more, such as the permeability condition, pressure, time and the like of slurry, so that the measurement accuracy of the permeability is insufficient in the concrete practice of the existing scheme.
Disclosure of Invention
Based on the problems, the invention provides a determination method, a storage medium and a system for coal rock permeability, and solves the technical problems of complex operation and low test precision of a coal rock permeability test method in the prior art. By adopting the method for determining the permeability of the coal rock, the testing difficulty of 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:
obtaining a test coal sample, opening a hole in the center of the test coal sample and sealing the upper surface and the lower surface of the hole;
placing a test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring a gas pressure value in the closed space and a gas pressure value in a hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal 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 multiple times, so that the air pressure values in the closed space are different, and the air pressure values in the holes are respectively obtained when the air pressure values in the holes are constant;
and (4) the air pressure values in different holes correspond to different coal rock permeability, and the minimum value is selected as the coal rock permeability.
In addition, the step of determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
wherein, mu0For the viscosity of the applied gas, r is the radius of the bottom surface of the test coal sample, P2To apply any value of pressure of gas, P1Is a reaction with P2And K is the permeability of the coal rock corresponding to the air pressure value in the hole.
Wherein the viscosity of the applied gas is the density ρ of the applied gas0Velocity V of applied gas0Mean free path.
In addition, the step of determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ0to apply the viscosity of the gas, P2To apply any value of pressure of gas, P1Is a reaction with P2And K is the permeability of the coal rock corresponding to the air pressure value in the hole.
In addition, the step of determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ0to apply the viscosity of the gas, P2To apply any value of pressure of gas, P1Is a reaction with P2And (c) corresponding gas pressure values in the holes, t is the time length from the moment when the gas pressure value of the applied gas in the closed space is changed into any gas pressure value to the moment when the gas pressure value in the hole corresponding to any gas pressure value is monitored to be constant, and K is the permeability of the coal rock.
In addition, the method for judging the constant air pressure value in the hole comprises the following steps:
constructing a rectangular coordinate system;
acquiring the stress of the hole in the direction of a transverse shaft of a rectangular coordinate system to obtain transverse stress;
obtaining the stress of the center of the test coal sample in the longitudinal axis direction of the rectangular coordinate system to obtain the longitudinal stress;
if the change of the two air pressure values before and after the hole is monitored, namely delta P < min { alpha, (epsilon 1-epsilon 2) × 2 × T × ρ 0(1-V0)2/2 π r1h, the air pressure value in the hole is determined to be constant;
where ε 1 is the transverse stress, ε 2 is the longitudinal stress, ρ0For applying the density of the gas, V0For applying a flow rate of gas, r1The radius of the hole, h the height of the coal sample to be tested, alpha a preset change threshold, T the temperature of the enclosed space, and delta P the air pressure value currently monitored minus the air pressure value monitored at the previous moment.
In addition, the test coal sample was cylindrical.
In addition, a round hole was opened at the center of the test coal sample.
The invention also provides a storage medium which stores computer instructions for executing the coal rock permeability determining method.
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 to cause the at least one processor to:
obtaining a test coal sample, opening a hole in the center of the test coal sample and sealing the upper surface and the lower surface of the hole;
placing a test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring a gas pressure value in the closed space and a gas pressure value in a hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal 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 testing difficulty of 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 and rock provided by an embodiment of the invention;
FIG. 2 is a flowchart of a method for determining a constant 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 present invention is described in further detail below with reference to specific embodiments and the attached drawings. It is intended that the present invention not be limited to the particular embodiments disclosed, but that the present invention be limited only by the appended claims.
Referring to fig. 1, the invention provides a method for determining coal rock permeability, which includes:
s001, obtaining a test coal sample, opening a hole in the center of the test coal sample and sealing the upper surface and the lower surface of the hole;
s002, placing a test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring a gas pressure value in the closed space and a gas pressure value in a hole when the gas pressure value in the hole is monitored to be constant;
and S003, determining the permeability K of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole.
In step S001, a part of the coal rock is obtained as a test coal sample, and optionally, the obtained test coal sample is cylindrical. The height of the cylinder, i.e. the height of the test coal sample, is recorded as h3The 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 holes are round holes to facilitate drilling.
In step S002, a hole is opened at the center of the test coal sample and the upper and lower faces of the hole are sealed.
For example, a radius r is set at the center of the test coal sample1Of hole (d), the hole height is also h3The hole is used for gas seepage, and the upper and lower surfaces of the hole are sealed by films.
In addition, a pressure monitoring device is connected to the aperture. Specifically, can put into downthehole with atmospheric pressure monitoring devices, also can be through cavity pipeline with hole and atmospheric pressure monitoring devices, the gas in the hole passes to atmospheric pressure monitoring devices through cavity pipeline, and then atmospheric pressure monitoring devices measures the atmospheric pressure value of the gas of coming.
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 in the holes is monitored by an air pressure monitoring device. This step can be realized by the following process:
1) the test coal sample was placed in a constant temperature closed space. Optionally, the constant temperature (T) is 20 degrees celsius.
2) And applying gas to the closed space, and adjusting the gas pressure value of the gas. The gas here may be helium, or other gas, and the present embodiment does not specifically limit the gas to be applied.
3) And aiming at each air pressure value of the applied gas, monitoring the change of the air pressure value in the hole through an air pressure monitoring device, 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 two 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 testing difficulty of the permeability of the coal rock is reduced, and the accurate determination of the permeability of the coal rock is realized.
In one embodiment, gas is applied to the closed space for multiple times, so that the gas pressure values in the closed space are different, and the gas pressure values in the holes are respectively obtained when the gas pressure values in the holes are constant;
and (4) selecting the minimum value as the permeability K of the coal rock, wherein the air pressure values in different holes correspond to different permeability of the coal rock.
Placing the test coal sample in a constant temperature closed space, and applying a gas (the gas pressure of the gas is as follows)
) At this time, the air pressure value in the hole is monitored by the air pressure monitoring device, and if the current air pressure value is monitored to be constant (such as
) Then the pressure in the hole (e.g. air pressure) will be at that time
) As the corresponding pressure value within the bore corresponding to the current pressure value of the applied gas. Then, the pressure value of the gas applied in the closed space is adjusted to
After adjustment, the air pressure in the hole is monitored again by the air pressure monitoring device, and if the current air pressure is monitored to be constant (such as
) Then the pressure in the hole (e.g. air pressure) will be at that time
) As the pressure value within the bore corresponding to the current pressure value of the applied gas. By analogy, all the air pressure values of the applied air in the closed space obtain the corresponding air in the holeThe pressure value is up.
Here, the air pressure value is adjusted several times by applying air in the enclosed space, and what air pressure value is adjusted is preset, which is not required in this embodiment.
Since the obtained gas pressure value in each of the plurality of holes corresponds to the gas pressure value of one applied gas, the permeability of the coal rock 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 permeability of the coal rock 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, and the permeability of the coal rock at different gas pressure values is obtained.
And finally, selecting the minimum coal rock permeability as the coal rock permeability K from the obtained coal rock permeabilities under different air pressure values.
And obtaining the optimal and most accurate coal rock permeability through multiple tests.
The coal rock permeability has a plurality of calculation formulas, and one of the calculation formulas can be adopted.
In one embodiment, the determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
wherein, mu0For the viscosity of the applied gas, r is the radius of the bottom surface of the test coal sample, P2To apply any value of pressure of gas, P1Is a reaction with P2The corresponding air pressure value in the hole;
wherein the viscosity of the applied gas is the density ρ of the applied gas0Velocity V of applied gas0Mean free path.
In one embodiment, the determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ0to apply the viscosity of the gas, P2To apply any value of pressure of gas, P1Is a reaction with P2The corresponding air pressure value in the hole.
In one embodiment, the determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ0to apply the viscosity of the gas, P2To apply any value of pressure of gas, P1Is a reaction with P2And t is the time length from the time when the gas pressure value of the applied gas in the closed space is changed into any gas pressure value to the time when the gas pressure value in the hole corresponding to any gas pressure value is monitored to be constant.
If t is monitored, the current air pressure value is constant
Time-adjusting the pressure value of the gas applied in the enclosed space to
Time of (d).
Referring to fig. 2, in one embodiment, the method for determining that the air pressure value in the hole is constant includes:
step S201, constructing a rectangular coordinate system; as shown in fig. 3.
Step S202, acquiring the stress of the hole in the direction of a transverse axis of a rectangular coordinate system to obtain transverse stress;
step S203, obtaining the stress of the center of the test coal sample in the longitudinal axis direction of the rectangular coordinate system to obtain the longitudinal stress;
step S204, if the change of the two air pressure values before and after the hole is monitored, namely delta P < min { alpha (epsilon 1-epsilon 2) × 2 × T × ρ 0(1-V0)2/2 π r1h, the air pressure value in the hole is determined to be constant;
wherein ε 1 is the transverse directionStress,. epsilon.2, is the longitudinal stress,. rho0For applying the density of the gas, V0For applying a flow rate of gas, r1The radius of the hole, h the height of the coal sample to be tested, alpha a preset change threshold, T the temperature of the enclosed space, and delta P the air pressure value currently monitored 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 central 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, the x-axis is the horizontal axis, and the y-axis is the vertical axis.
In step S202, the stress in the hole in the direction of the horizontal axis of the rectangular coordinate system is obtained, and the transverse stress is obtained.
In step S203, the stress at 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 particular, a stress sensor (such as a transverse strain gauge and a longitudinal strain gauge) can be added in the hole to obtain transverse stress and longitudinal stress.
In step S204, if the change Δ P < min { α, (e 1-e 2) × 2 × T ρ 0(1-V0)2/2 π r1h between the two previous and subsequent air pressure values is monitored, it is determined that the air pressure value in the hole is constant.
Where ε 1 is the transverse stress, ε 2 is the longitudinal stress, ρ0For applying the density of the gas, V0For applying a flow rate of gas, r1Is the radius of the hole, h is the height of the test coal sample, α is a preset variation threshold, and T is the temperature of the enclosed space, e.g., 30 ℃.
ρ0、V0Can be obtained by measurement, and the measurement scheme is an existing scheme and is not limited here.
And delta P is the air pressure value currently monitored by the air pressure monitoring device-the air pressure value currently monitored by the air pressure monitoring device at the previous moment.
The previous time may be the previous second or the previous minute, and the interval is preset according to how often, which is not limited in this embodiment.
α may be set according to an empirical value or obtained by big data analysis, and the embodiment does not limit the determination manner and specific value of α.
The step is not a fixed judgment standard for constant air pressure value, and is a standard for dynamically obtaining constant air pressure value according to different coal rock conditions, wherein the two air pressure value changes before and after the constant air pressure value is established are in direct proportion to the difference between the transverse stress and the longitudinal stress, the density of the gas and the flow rate of the applied gas, and 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 greater the density, the greater the change in the two preceding and following gas pressure values, and the smaller the density, the smaller the change in the two preceding and following gas pressure values, the constant gas pressure value is determined.
And the dynamic constant judgment of the air pressure value can be used for accurately judging according to the current applied gas condition and the test coal sample.
In one embodiment, the test coal sample is a cylinder. To facilitate the sampling of the mold, the test coal sample is made to be a cylinder.
In one embodiment, a round hole is cut in the center of the test coal sample. In order to facilitate drilling, a circular hole is formed in the center of the test coal sample.
The invention also provides a storage medium which stores computer instructions for executing the coal rock permeability determining method.
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 to cause the at least one processor to:
obtaining a test coal sample, opening a hole in the center of the test coal sample and sealing the upper surface and the lower surface of the hole;
placing a test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring a gas pressure value in the closed space and a gas pressure value in a hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal 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 testing difficulty of the permeability of the coal rock is reduced, and the accurate determination of the permeability of the coal rock is realized.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
Claims (10)
1. A method for determining permeability of coal rock is characterized by comprising the following steps:
obtaining a test coal sample, opening a hole in the center of the test coal sample and sealing the upper surface and the lower surface of the hole;
placing a test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring a gas pressure value in the closed space and a gas pressure value in a hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole.
2. The method for determining coal petrography permeability of claim 1,
applying gas into the closed space for multiple times to enable the air pressure values in the closed space to be different, and respectively obtaining the air pressure values in the holes when the air pressure values in the holes are constant;
and (4) the air pressure values in different holes correspond to different coal rock permeability, and the minimum value is selected as the coal rock permeability.
3. The method for determining coal petrography permeability of claim 1,
determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
wherein, mu0For the viscosity of the applied gas, r is the radius of the bottom surface of the test coal sample, P2To apply any value of pressure of gas, P1Is a reaction with P2And K is the permeability of the coal rock corresponding to the air pressure value in the hole.
Wherein the viscosity of the applied gas is the density ρ of the applied gas0Velocity V of applied gas0Mean free path.
4. The method for determining coal petrography permeability of claim 1,
determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ0to apply the viscosity of the gas, P2To apply any value of pressure of gas, P1Is a reaction with P2And K is the permeability of the coal rock corresponding to the air pressure value in the hole.
5. The method for determining coal petrography permeability of claim 1,
determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole comprises the following steps:
μ0to apply the viscosity of the gas, P2To apply any value of pressure of gas, P1Is a reaction with P2And (c) corresponding gas pressure values in the holes, t is the time length from the moment when the gas pressure value of the applied gas in the closed space is changed into any gas pressure value to the moment when the gas pressure value in the hole corresponding to any gas pressure value is monitored to be constant, and K is the permeability of the coal rock.
6. The method for determining coal petrography permeability of claim 1,
the method for judging the constant air pressure value in the hole comprises the following steps:
constructing a rectangular coordinate system;
acquiring the stress of the hole in the direction of a transverse shaft of a rectangular coordinate system to obtain transverse stress;
obtaining the stress of the center of the test coal sample in the longitudinal axis direction of the rectangular coordinate system to obtain the longitudinal stress;
if the change delta P of the front and back air pressure values in the hole is monitored<min{α,(ε1-ε2)*2*T*ρ0(1-V0)2/2πr1h, determining that the air pressure value in the hole is constant;
where ε 1 is the transverse stress, ε 2 is the longitudinal stress, ρ0For applying the density of the gas, V0For applying a flow rate of gas, r1The radius of the hole, h the height of the coal sample to be tested, alpha a preset change threshold, T the temperature of the enclosed space, and delta P the air pressure value currently monitored minus the air pressure value monitored at the previous moment.
7. The method for determining coal petrography permeability of claim 1,
the test coal sample is a cylinder.
8. The method for determining coal petrography permeability according to any one of claims 1 to 7,
and a round hole is formed in the center of the test coal sample.
9. A storage medium storing computer instructions for performing the method of determining coal rock permeability according to any one of claims 1 to 8 when executed by a computer.
10. A system for determining permeability of a coal 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 to cause the at least one processor to:
obtaining a test coal sample, opening a hole in the center of the test coal sample and sealing the upper surface and the lower surface of the hole;
placing a test coal sample in a constant-temperature closed space, applying gas into the closed space, and acquiring a gas pressure value in the closed space and a gas pressure value in a hole when the gas pressure value in the hole is monitored to be constant;
and determining the permeability of the coal rock according to the air pressure value in the closed space and the air pressure value in the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111600352.7A CN114136864B (en) | 2021-12-24 | 2021-12-24 | Method, storage medium and system for determining permeability of coal and rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111600352.7A CN114136864B (en) | 2021-12-24 | 2021-12-24 | Method, storage medium and system for determining permeability of coal and rock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114136864A true CN114136864A (en) | 2022-03-04 |
| CN114136864B CN114136864B (en) | 2023-12-08 |
Family
ID=80383287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111600352.7A Active CN114136864B (en) | 2021-12-24 | 2021-12-24 | Method, storage medium and system for determining permeability of coal and rock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114136864B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3926133A1 (en) * | 1989-08-08 | 1991-02-14 | Koepper Gmbh Dr | Test line for rock permeability testing - has measurement bells and packers on tube sections with connecting lines to earth's surface |
| CN102435537A (en) * | 2011-11-21 | 2012-05-02 | 中国石油大学(华东) | Measuring device for gas permeability of coal rock core |
| CN102636424A (en) * | 2012-04-24 | 2012-08-15 | 中煤科工集团重庆研究院 | Method and device for measuring coal rock adsorption gas quantity and permeability |
| CN103115843A (en) * | 2012-12-26 | 2013-05-22 | 中国人民解放军63653部队 | In situ measurement method for rock mass gas permeability |
| CN104345022A (en) * | 2013-07-30 | 2015-02-11 | 河南煤业化工集团研究院有限责任公司 | Method for directly testing permeability of underground coal seam |
| WO2017128479A1 (en) * | 2016-01-25 | 2017-08-03 | 中国矿业大学 | Fully-automated system for testing gas permeability of rock and estimation method |
| CN107870144A (en) * | 2017-11-07 | 2018-04-03 | 中国矿业大学 | A kind of test device and method of coal petrography body strain crack permeability |
| CN207488144U (en) * | 2018-01-15 | 2018-06-12 | 北京市地热研究院 | The simple experimental device of computational fluid dynamics leak-off in a kind of monitoring rock sample |
| CN108458962A (en) * | 2018-06-11 | 2018-08-28 | 辽宁工程技术大学 | A kind of device and method for testing Permeability Oe Coal And Porous Rock And Fractured Rock |
| US20190323340A1 (en) * | 2017-11-24 | 2019-10-24 | Shandong University Of Science And Technology | Dynamically self-balancing pressurized borehole-sealing apparatus and method thereof for coal seam gas pressure measurement |
| US20190353575A1 (en) * | 2018-05-15 | 2019-11-21 | Uti Limited Partnership | Method and system for measuring a parameter of a core sample |
| CN111337411A (en) * | 2020-04-14 | 2020-06-26 | 中国石油天然气集团有限公司 | Method and device for testing radial permeability of full-diameter shale |
| CN113138150A (en) * | 2021-04-27 | 2021-07-20 | 中国平煤神马能源化工集团有限责任公司 | Transient pressure-based low-permeability coal seam in-situ permeability testing method and device |
| CN113237811A (en) * | 2021-04-27 | 2021-08-10 | 深圳大学 | Combined test method for in-situ coal seam permeability and mining stress |
-
2021
- 2021-12-24 CN CN202111600352.7A patent/CN114136864B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3926133A1 (en) * | 1989-08-08 | 1991-02-14 | Koepper Gmbh Dr | Test line for rock permeability testing - has measurement bells and packers on tube sections with connecting lines to earth's surface |
| CN102435537A (en) * | 2011-11-21 | 2012-05-02 | 中国石油大学(华东) | Measuring device for gas permeability of coal rock core |
| CN102636424A (en) * | 2012-04-24 | 2012-08-15 | 中煤科工集团重庆研究院 | Method and device for measuring coal rock adsorption gas quantity and permeability |
| CN103115843A (en) * | 2012-12-26 | 2013-05-22 | 中国人民解放军63653部队 | In situ measurement method for rock mass gas permeability |
| CN104345022A (en) * | 2013-07-30 | 2015-02-11 | 河南煤业化工集团研究院有限责任公司 | Method for directly testing permeability of underground coal seam |
| WO2017128479A1 (en) * | 2016-01-25 | 2017-08-03 | 中国矿业大学 | Fully-automated system for testing gas permeability of rock and estimation method |
| CN107870144A (en) * | 2017-11-07 | 2018-04-03 | 中国矿业大学 | A kind of test device and method of coal petrography body strain crack permeability |
| US20190323340A1 (en) * | 2017-11-24 | 2019-10-24 | Shandong University Of Science And Technology | Dynamically self-balancing pressurized borehole-sealing apparatus and method thereof for coal seam gas pressure measurement |
| CN207488144U (en) * | 2018-01-15 | 2018-06-12 | 北京市地热研究院 | The simple experimental device of computational fluid dynamics leak-off in a kind of monitoring rock sample |
| US20190353575A1 (en) * | 2018-05-15 | 2019-11-21 | Uti Limited Partnership | Method and system for measuring a parameter of a core sample |
| CN108458962A (en) * | 2018-06-11 | 2018-08-28 | 辽宁工程技术大学 | A kind of device and method for testing Permeability Oe Coal And Porous Rock And Fractured Rock |
| CN111337411A (en) * | 2020-04-14 | 2020-06-26 | 中国石油天然气集团有限公司 | Method and device for testing radial permeability of full-diameter shale |
| CN113138150A (en) * | 2021-04-27 | 2021-07-20 | 中国平煤神马能源化工集团有限责任公司 | Transient pressure-based low-permeability coal seam in-situ permeability testing method and device |
| CN113237811A (en) * | 2021-04-27 | 2021-08-10 | 深圳大学 | Combined test method for in-situ coal seam permeability and mining stress |
Non-Patent Citations (5)
| Title |
|---|
| 周军平;鲜学福;李晓红;许江;谷达圣;: "吸附不同气体对煤岩渗透特性的影响", 岩石力学与工程学报, no. 11, pages 2256 - 2262 * |
| 崔猛;张锋;向衍斌;: "含瓦斯煤孔隙率测定方法的研究进展", 能源技术与管理, no. 05 * |
| 李康;杨典森;陈卫忠;王威;周云;邢天海;郑有雷;: "不同应力和孔隙压力作用下致密煤岩渗透率演化规律", 太原理工大学学报, no. 03 * |
| 翟成;孙勇;: "低温循环致裂煤体孔隙结构演化规律试验研究", 煤炭科学技术, no. 06 * |
| 陶云奇;闫本正;刘东;: "煤矿井下煤层渗透率直接测定方法研究及应用", 煤矿安全, no. 03 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114136864B (en) | 2023-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107084886B (en) | Method for determining effective stress coefficient of rock | |
| US20070056383A1 (en) | Apparatus and method for determining mechanical properties of cement for a well bore | |
| CN106769778B (en) | A kind of permeability measurement systems and measurement method of hypotonic rock particle | |
| JP3381991B2 (en) | Water permeability measuring apparatus and water permeability measuring method using the same | |
| CN103226089B (en) | Method for testing shale gas permeability | |
| US10732086B2 (en) | Device and method for measuring magnitude of seepage force and its influence on effective stress of formation | |
| CN110397015B (en) | Processing method of seabed in-situ test data | |
| CN106869909B (en) | Testing device and testing method for determining hydrogeological parameters of inclined filling fracture | |
| CN110068527A (en) | The automatic continuous test device of Permeability Oe Coal And Porous Rock And Fractured Rock and its method under a kind of nonequilibrium condition | |
| CN106777515B (en) | Method for analyzing production energy of tight gas well based on rock core experiment data | |
| CN108444890B (en) | Unsteady state titration device and method for testing medium and high permeability core liquid permeability | |
| CN104389592A (en) | Oil loss evaluation experiment test method for water flooded layer of bottom water condensate gas reservoir with oil rim | |
| CN109813645A (en) | A kind of the radial penetration rate measuring system and method for hypotonic rock ore-rock stem plug | |
| CN103061321A (en) | Cone penetrometer for evaluating penetration property of unsaturated soil | |
| CN109241651B (en) | Universal stratum fracture pressure prediction method | |
| CN114136864A (en) | Coal rock permeability determination method, storage medium and system | |
| CN203241324U (en) | Shale gas permeability determinator | |
| CN210180875U (en) | Clay mineral directional hydration expansion rate measuring device | |
| CN112082875B (en) | In-situ soil body parameter measuring device based on pressure penetration | |
| CN111426617B (en) | Quantitative prediction method for porosity of dense reservoir of land lake basin under geological conditions | |
| JP2007047058A (en) | System and method for measuring rock permeability at original site | |
| CN1220039C (en) | Measuring method and its device for deep water pressure | |
| Malengier et al. | Unsaturated permeability and retention curve determination from in-flight weight measurements in a bench-scale centrifuge | |
| CN214794359U (en) | Core holder for accurately measuring large-diameter long core section pressure | |
| CN218204285U (en) | Piezocone sounding probe calibrating device based on vacuum degassing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |