CN116735456A - Device and method for measuring coal rock permeability - Google Patents
Device and method for measuring coal rock permeability Download PDFInfo
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- CN116735456A CN116735456A CN202311027753.7A CN202311027753A CN116735456A CN 116735456 A CN116735456 A CN 116735456A CN 202311027753 A CN202311027753 A CN 202311027753A CN 116735456 A CN116735456 A CN 116735456A
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- 239000011435 rock Substances 0.000 title claims abstract description 83
- 239000003245 coal Substances 0.000 title claims abstract description 79
- 230000035699 permeability Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000000605 extraction Methods 0.000 claims abstract description 61
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000008595 infiltration Effects 0.000 claims abstract description 17
- 238000001764 infiltration Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 123
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 238000004817 gas chromatography Methods 0.000 claims description 8
- 230000008016 vaporization Effects 0.000 claims description 6
- 238000009834 vaporization Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
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Abstract
The application provides a measuring device and a measuring method for coal rock infiltration, wherein a temperature control module in the measuring device is used for heating a coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample; the gas chromatographic module is used for separating volatile gas from the gas sample to obtain target gas without volatile gas; the reaction kettle vacuum negative pressure module is used for carrying out vacuum extraction on target gas in the reaction kettle to obtain vacuum negative pressure of the reaction kettle after the extraction; the sample fixture negative pressure module is used for acquiring the initial vacuum pressure of a preset vacuum extraction standard chamber and the target vacuum pressure after the vacuum extraction standard chamber is filled with a gas sample for vacuum extraction; the calculation module is used for receiving the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure to calculate the gas-measurement permeability of the coal-rock sample, so that the rapid and accurate calculation of the gas-measurement permeability corresponding to the coal-rock sample is realized based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure.
Description
Technical Field
The application relates to the technical field of rock mechanics, in particular to a device and a method for measuring coal rock infiltration.
Background
The coal bed gas is used as a high-quality clean energy source, has great development and utilization values, the permeability characteristics of the coal and rock are directly related to the extraction effect of the coal bed gas, and the changes of the temperature condition, the confining pressure state and the like of a coal reservoir can greatly influence the permeability characteristics of the coal and rock. Therefore, the response rule of the permeability of the coal and the rock to the pore pressure is systematically researched, the method has important engineering guiding significance for improving the extraction rate of the coal bed gas, in the related technology, the traditional measuring instrument for measuring the permeability has a complex structure, high-pressure gas cylinders are used, and certain dangers exist in experimental operation, so that a more reliable measuring device for the coal and the rock permeability is needed.
Disclosure of Invention
According to one aspect, the embodiment of the application provides a coal rock infiltration measuring device, which comprises a temperature control module, a gas chromatography module, a reaction kettle vacuum negative pressure module, a sample clamp negative pressure module and a calculation module, wherein:
the temperature control module is used for heating the coal rock sample to a preset target temperature through the reaction kettle so as to obtain a gas sample released by the coal rock sample;
the gas chromatographic module is used for separating volatile gas from the gas sample to obtain target gas without volatile gas;
the reaction kettle vacuum negative pressure module is used for carrying out vacuum extraction on target gas in the reaction kettle so as to obtain the vacuum negative pressure of the reaction kettle after the extraction;
the sample fixture negative pressure module is used for acquiring initial vacuum pressure of a preset vacuum extraction standard chamber and target vacuum pressure after the gas sample is introduced into the vacuum extraction standard chamber for vacuum extraction;
the calculation module is used for receiving the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure so as to calculate the gas-measurement permeability of the coal-rock sample.
In one embodiment of the application, the temperature control module consists of a reaction kettle, a sealing cover, a heating coil in the reaction kettle body, a temperature sensor, a heat insulation and freezing resistance material, a liquid nitrogen bottle, a first pressure reducing valve, a liquid nitrogen control switch and a temperature sensor control display.
In one embodiment of the application, the temperature sensors comprise at least one, wherein in the case of 4 temperature sensors, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all arranged on the surface of the reaction kettle.
In one embodiment of the application, the gas chromatography module is composed of a gas carrying bottle, a second pressure reducing valve, a purifier, a flow regulating valve, a flow rotor meter, a chromatographic column, a vaporization chamber and a detector.
In one embodiment of the application, the detector is comprised of an amplifier, a first data processing sub-module.
In one embodiment of the application, the reaction kettle vacuum negative pressure module consists of a pressure gauge, a front valve connected with the reaction kettle, a gas storage bin, a rear valve connected with the reaction kettle, a first vacuum pump and a pulley.
In one embodiment of the application, the sample fixture negative pressure module is composed of a clamp holder, a coal rock sample, an exhaust hole control valve, a sample fixture negative pressure control front valve, a sample fixture negative pressure gauge, a vacuum extraction standard chamber, a pressure sensor, a sample fixture negative pressure control rear valve, a second vacuum pump and a second data processing submodule.
The application provides a measuring device for coal rock infiltration, wherein a temperature control module is used for heating a coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample; the gas chromatographic module is used for separating volatile gas from the gas sample to obtain target gas without volatile gas; the reaction kettle vacuum negative pressure module is used for carrying out vacuum extraction on target gas in the reaction kettle to obtain vacuum negative pressure of the reaction kettle after the extraction; the sample fixture negative pressure module is used for acquiring the initial vacuum pressure of a preset vacuum extraction standard chamber and the target vacuum pressure after the vacuum extraction standard chamber is filled with a gas sample for vacuum extraction; the calculation module is used for receiving the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure to calculate the gas-measurement permeability of the coal-rock sample, so that the rapid and accurate calculation of the gas-measurement permeability corresponding to the coal-rock sample is realized based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure.
In another aspect, the embodiment of the application provides a method for measuring coal rock infiltration, which comprises the following steps: heating a coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample; separating the volatile gas from the gas sample to obtain a target gas without volatile gas; vacuum extracting is carried out on target gas in the reaction kettle so as to obtain vacuum negative pressure of the reaction kettle after the extraction; acquiring an initial vacuum pressure of a preset vacuum extraction standard chamber, and introducing the gas sample into the vacuum extraction standard chamber to carry out vacuum extraction to obtain a target vacuum pressure; and the calculation module is used for receiving the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure so as to calculate the gas-measured permeability of the coal-rock sample.
The application provides a coal rock infiltration measuring method, which comprises the steps of heating a coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample; separating volatile gas from the gas sample to obtain target gas without volatile gas; vacuum extracting is carried out on target gas in the reaction kettle so as to obtain vacuum negative pressure of the reaction kettle after the extraction; acquiring an initial vacuum pressure of a preset vacuum extraction standard chamber, and introducing a gas sample into the vacuum extraction standard chamber to carry out vacuum extraction to obtain a target vacuum pressure; based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure, the gas measurement permeability of the coal rock sample is calculated, and therefore, based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure, the rapid and accurate calculation of the gas measurement permeability corresponding to the coal rock sample is realized.
Other effects of the above alternative will be described below in connection with specific embodiments.
Drawings
FIG. 1 is a schematic structural view of a measuring apparatus for coal rock infiltration according to an embodiment of the present application;
fig. 2 is a flow chart of a method for measuring coal rock permeability according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The following describes a measurement device for coal rock infiltration according to an embodiment of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a measuring apparatus for coal rock infiltration according to an embodiment of the present application.
As shown in fig. 1, the measuring device for coal-rock infiltration includes a temperature control module (not shown in the figure), a gas chromatography module (not shown in the figure), a reaction kettle vacuum negative pressure module (not shown in the figure), a sample fixture negative pressure module (not shown in the figure), and a calculation module (not shown in the figure), wherein:
in some embodiments, as shown in fig. 1, the temperature control module is composed of a reaction kettle 11, a sealing cover 12, a heating coil 13 in the reaction kettle body, a temperature sensor 14, a heat insulation and freezing resistance material 15, a liquid nitrogen bottle 16, a first pressure reducing valve 17, a liquid nitrogen control switch 18 and a temperature sensor control display 19, and is used for heating a coal rock sample 42 to a preset target temperature through the reaction kettle 11 so as to obtain a gas sample released by the coal rock sample 42.
Alternatively, the coal-rock sample 42 may be selected by taking a raw coal-rock mass, drilling a sample with a diameter of 5cm and a length of 10cm, and measuring whether the length, diameter and quality meet the preset sample requirements.
Alternatively, the preset target temperature may be selected in conjunction with historical penetration data, but is not limited thereto.
Alternatively, the gas sample released by the coal rock sample 42 may include, but is not limited to, a volatile gas and an inert gas, which may be a gas that does not react with the stationary phase and the sample, such as nitrogen.
Alternatively, as shown in fig. 1, the temperature sensor 14 includes at least one, wherein, in the case that the number of the temperature sensors 14 is 4, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are all installed on the surface of the reaction kettle 11.
Wherein, the temperature sensor 14 is used for recording the temperature change of the surface of the reaction kettle 11 in real time.
In some embodiments, as shown in fig. 1, the gas chromatography module is composed of a gas carrier bottle 21, a second pressure reducing valve 22, a purifier 23, a flow regulating valve 24, a flow rotor meter 25, a chromatographic column 26, a vaporization chamber 27 and a detector 28, and is used for separating volatile gas from a gas sample to obtain target gas without volatile gas, so that no impurity gas is separated out at a certain temperature, and the accuracy of coal rock permeation measurement is improved.
Optionally, as shown in fig. 1, the detector 28 is composed of an amplifier 281, a first data processing sub-module 282.
The first data processing sub-module may be a computer, but is not limited thereto.
Alternatively, the operation flow of the gas chromatography module may be: 1. the gas carrier 21 is opened, the first pressure reducing valve 17 is then set, and the valve amount of the flow regulating valve 24 is adjusted to an appropriate value (measured by the flow rotator meter 25).
2. The gas is fused with the gas sample released from the coal and rock sample 42 through the vaporization chamber 27, which is typically made of a stainless steel tube around which a heater wire is wound to instantaneously gasify some of the remaining liquid into vapor, so that the sample gas released from the sample is not decomposed in the vaporization chamber, and therefore, the vaporization chamber is required to have a large heat capacity without a catalytic effect.
3. The column 26 is the core component of the chromatograph and functions to separate the individual gas components of the gas sample to obtain a target gas free of volatile gases.
4. The gas sample is passed through the column 26 and monitored by the detector 28 by means of a device which converts the concentration or mass (content) of each component separated by the column 26 into an electrical signal (e.g. voltage, current, etc.) which is readily measured and signal-processed.
5. The detector 28 is generally composed of an amplifier 281 and a first data processing submodule 282, the components (target gases) separated by the chromatographic column 26 sequentially enter the detector 28, are converted into corresponding electric signals according to the change of the concentration or the quality of the electric signals with time, are amplified, recorded and displayed, and draw a chromatogram to determine which gas components are contained until the detection is completed.
In some embodiments, as shown in fig. 1, the reaction kettle vacuum negative pressure module is composed of a pressure gauge 31, a front valve 32 connected with the reaction kettle 11, a gas storage bin 33, a rear valve 34 connected with the reaction kettle 11, a first vacuum pump 35 and a pulley 36, and is used for vacuum extraction of target gas in the reaction kettle 11 to obtain vacuum negative pressure of the reaction kettle 11 after extraction.
Optionally, the first vacuum pump 35 is used for vacuum pumping the target gas in the reaction kettle 11, and the gas storage bin 33 is used for storing the target gas.
Optionally, after the gas sample is separated by the gas chromatography module and the impurity gas is removed, the back valve 34 and the front valve 32 connected with the reaction kettle 11 are opened, and a first vacuum pump is used35 evacuating the air in the reaction kettle 11, and recording the vacuum negative pressure as。
In some embodiments, as shown in fig. 1, the sample holder negative pressure module is composed of a holder 41, a coal rock sample 42, an exhaust hole 43, an exhaust hole control valve 44, a sample holder negative pressure control front valve 45, a sample holder negative pressure gauge 46, a vacuum extraction standard chamber 47, a pressure sensor 48, a sample holder negative pressure control rear valve 49, a second vacuum pump 51, and a second data processing sub-module 52, and is used for obtaining an initial vacuum pressure of the preset vacuum extraction standard chamber 47 and a target vacuum pressure after the vacuum extraction standard chamber 47 is filled with a gas sample for vacuum extraction.
Alternatively, one embodiment of determining the impurity removal clean may be: and determining the impurity gas corresponding to the gas sample, opening the sample clamp negative pressure control rear valve 49, closing the sample clamp negative pressure control front valve 45, opening the second vacuum pump 51 to evacuate the impurity gas, and detecting through the detector 28 to ensure that the impurity gas is completely removed.
Optionally, one embodiment of obtaining the initial vacuum pressure of the preset vacuum extraction standard chamber 47 and the target vacuum pressure after the vacuum extraction standard chamber 47 is vacuum-extracted by introducing the gas sample is: the second vacuum pump 51 is turned on, the sample holder negative pressure control rear valve 49 is turned on, the sample holder negative pressure control front valve 45 is turned off, and the vacuum drawing standard chamber 47 is evacuated by the second vacuum pump 51 to have an initial vacuum pressureThe sample holder negative pressure control front valve 45 is opened, and the second data processing sub-module 52 is used to measure the pressure in the vacuum suction standard chamber 47 at one end of the holder 41 from +.>Change to->(target vacuum pressure),and determining the time taken for it>。
The second data processing sub-module 52 may be a computer, but is not limited thereto.
In some embodiments, a calculation module is configured to receive the vacuum sub-pressure, the initial vacuum pressure, and the target vacuum pressure to calculate the gas permeability of the coal rock sample 42.
The gas permeability of the coal rock sample 42 may be calculated according to the western law, but is not limited thereto.
Specifically, the vacuum negative pressure isInitial vacuum pressure +.>Target vacuum pressure +.>And is +.>In the case, it is assumed that the sum of the volumes of the voids between the vacuum pumping standard chamber 47 standard chamber and the coal core (center of the coal core sample 42) is +.>At a certain time t, the pressure in the vacuum extraction standard chamber 47 is P, and the gas in the vacuum extraction standard chamber 47 is converted into the gas state +.>The volume below is->The following steps are:
(1)
wherein, toAt this time, the pressure in the vacuum suction standard chamber 47 is +.>The gas in the vacuum extraction standard chamber 47 is converted to the gas state in the reaction kettle 11 +.>The volume below is->The following steps are:
(2)
simultaneous (1) and (2) formulas, to obtain:
(3)
according to darcy's law, there are:
（4）
wherein Q is the gas sample flow rate,；
k is the gas permeability of the coal core,；
for the air viscosity through the coal core, +.>；
L is the length of the coal core,；
a is the sectional area of the coal core,；
p is the pressure in the vacuum pumping chamber 47 at time t,。
and (3) and (4) are combined, arranged and integrated to obtain a calculation formula of the gas measurement permeability K of the coal rock sample 42:
（5）
wherein:for the sum of the volumes of the vacuum pumping standard chamber 47 and its interspace with the coal core, +.>；
t1 and t2 are the pressures in the vacuum pumping standard chamber 47, respectively,Time s corresponding to the time.
In addition, after the gas permeability test is finished, the heating of the reaction kettle 11 is stopped, and the switch is rotated to naturally cool the reaction kettle to normal temperature; opening a first pressure reducing valve 17 communicated with air to release pressure in the reaction kettle 11; valve 45 and test before negative pressure control of sample holder is openedThe sample holder negative pressure controls the rear valve 49 to release the pressure of the holder 41; opening the sealing cover 12, taking out the clamp 41, and taking out the coal rock sample; and then exchanging the parallel coal rock sample 42, and repeatedly measuring the gas permeability of the coal rock sample 42, wherein the preset target temperature is another temperature +.>If the air permeability under low temperature needs to be measured, only the preset target temperature is required to be modified, the first pressure reducing valve 17 and the liquid nitrogen control switch 18 are opened, liquid nitrogen of the nitrogen cylinder is flushed into the reaction kettle 11, and the measurement of the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure is repeated until the air permeability under low temperature is measured.
The application provides a measuring device for coal rock infiltration, wherein a temperature control module is used for heating a coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample; the gas chromatographic module is used for separating volatile gas from the gas sample to obtain target gas without volatile gas; the reaction kettle vacuum negative pressure module is used for carrying out vacuum extraction on target gas in the reaction kettle to obtain vacuum negative pressure of the reaction kettle after the extraction; the sample fixture negative pressure module is used for acquiring the initial vacuum pressure of a preset vacuum extraction standard chamber and the target vacuum pressure after the vacuum extraction standard chamber is filled with a gas sample for vacuum extraction; the calculation module is used for receiving the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure to calculate the gas-measurement permeability of the coal-rock sample, so that the rapid and accurate calculation of the gas-measurement permeability corresponding to the coal-rock sample is realized based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure.
In order to understand the application more clearly, the application also provides a flow diagram of a coal rock infiltration measuring method, as shown in fig. 2.
As shown in fig. 2, the method for measuring coal rock infiltration includes:
step 201, heating the coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample.
Step 202, performing volatile substance separation on the gas sample to obtain a target gas without volatile substances.
And 203, carrying out vacuum extraction on target gas in the reaction kettle to obtain the vacuum negative pressure of the reaction kettle after the extraction.
Step 204, obtaining an initial vacuum pressure of a preset vacuum extraction standard chamber, and introducing a gas sample into the vacuum extraction standard chamber to perform vacuum extraction to obtain a target vacuum pressure.
Step 205, calculating the gas permeability of the coal rock sample based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure.
The application provides a coal rock infiltration measuring method, which comprises the steps of heating a coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample; separating volatile gas from the gas sample to obtain target gas without volatile gas; vacuum extracting is carried out on target gas in the reaction kettle so as to obtain vacuum negative pressure of the reaction kettle after the extraction; acquiring an initial vacuum pressure of a preset vacuum extraction standard chamber, and introducing a gas sample into the vacuum extraction standard chamber to carry out vacuum extraction to obtain a target vacuum pressure; based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure, the gas measurement permeability of the coal rock sample is calculated, and therefore, based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure, the rapid and accurate calculation of the gas measurement permeability corresponding to the coal rock sample is realized.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (8)
1. The utility model provides a measuring device that coal rock permeated, its characterized in that, measuring device that coal rock permeated includes temperature control module, gas chromatography module, reation kettle vacuum negative pressure module and sample anchor clamps negative pressure module, calculation module, wherein:
the temperature control module is used for heating the coal rock sample to a preset target temperature through the reaction kettle so as to obtain a gas sample released by the coal rock sample;
the gas chromatographic module is used for separating volatile gas from the gas sample to obtain target gas without volatile gas;
the reaction kettle vacuum negative pressure module is used for carrying out vacuum extraction on target gas in the reaction kettle so as to obtain the vacuum negative pressure of the reaction kettle after the extraction;
the sample fixture negative pressure module is used for acquiring initial vacuum pressure of a preset vacuum extraction standard chamber and target vacuum pressure after the gas sample is introduced into the vacuum extraction standard chamber for vacuum extraction;
the calculation module is used for receiving the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure so as to calculate the gas-measurement permeability of the coal-rock sample.
2. The coal rock permeability measurement device according to claim 1, wherein the temperature control module comprises a reaction kettle, a sealing cover, a heating coil in the reaction kettle, a temperature sensor, a heat insulation and freezing resistance material, a liquid nitrogen bottle, a first pressure reducing valve, a liquid nitrogen control switch and a temperature sensor control display.
3. The coal rock permeability measurement device according to claim 2, wherein the temperature sensor comprises at least one, wherein in the case of 4 temperature sensors, each of the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor is installed on the surface of the reaction kettle.
4. The coal rock permeability measurement device according to claim 1, wherein the gas chromatography module is composed of a gas carrier cylinder, a second pressure reducing valve, a purifier, a flow regulating valve, a flow rotator meter, a chromatographic column, a vaporization chamber, and a detector.
5. The coal rock permeability measurement device according to claim 4, wherein the detector is comprised of an amplifier, a first data processing sub-module.
6. The coal-rock permeability measurement device according to claim 1, wherein the reaction kettle vacuum negative pressure module is composed of a pressure gauge, a front valve connected with the reaction kettle, a gas storage bin, a rear valve connected with the reaction kettle, a first vacuum pump and a pulley.
7. The apparatus for measuring coal and rock infiltration according to claim 1, wherein the sample holder negative pressure module is composed of a holder, a coal and rock sample, an exhaust hole control valve, a sample holder negative pressure control front valve, a sample holder negative pressure gauge, a vacuum extraction standard chamber, a pressure sensor, a sample holder negative pressure control rear valve, a second vacuum pump, and a second data processing sub-module.
8. A method for measuring coal rock infiltration, characterized in that the method for measuring coal rock infiltration comprises:
heating a coal rock sample to a preset target temperature through a reaction kettle to obtain a gas sample released by the coal rock sample;
separating the volatile gas from the gas sample to obtain a target gas without volatile gas;
vacuum extracting is carried out on target gas in the reaction kettle so as to obtain vacuum negative pressure of the reaction kettle after the extraction;
acquiring an initial vacuum pressure of a preset vacuum extraction standard chamber, and introducing the gas sample into the vacuum extraction standard chamber to carry out vacuum extraction to obtain a target vacuum pressure;
and calculating the gas-measured permeability of the coal-rock sample based on the vacuum negative pressure, the initial vacuum pressure and the target vacuum pressure.
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