CN113155702A - Multi-channel mixed coal-rock body seepage test device and method - Google Patents
Multi-channel mixed coal-rock body seepage test device and method Download PDFInfo
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- CN113155702A CN113155702A CN202110458980.XA CN202110458980A CN113155702A CN 113155702 A CN113155702 A CN 113155702A CN 202110458980 A CN202110458980 A CN 202110458980A CN 113155702 A CN113155702 A CN 113155702A
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- 238000012360 testing method Methods 0.000 title claims abstract description 124
- 239000011435 rock Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title description 17
- 238000005253 cladding Methods 0.000 claims abstract description 48
- 239000003245 coal Substances 0.000 claims abstract description 44
- 238000007789 sealing Methods 0.000 claims abstract description 42
- 238000003825 pressing Methods 0.000 claims abstract description 36
- 238000010998 test method Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 121
- 238000001816 cooling Methods 0.000 claims description 5
- 230000009477 glass transition Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000003556 assay Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000013101 initial test Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 229920002160 Celluloid Polymers 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
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- 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
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Abstract
The invention discloses a multi-channel mixed coal rock mass seepage test device, which belongs to the technical field of tests and comprises at least two sealed cladding for placing a test sample, wherein the sealed cladding is provided with a side wall, a bottom wall and a top wall, the side wall is of a sealed structure and seals the side wall of the test sample, the bottom wall and the top wall are of a breathable structure, a lower pressing block is arranged at the lower end of the bottom wall, an upper pressing block is arranged at the upper end of the top wall, and the lower pressing block and the upper pressing block are respectively provided with an air inlet channel for enabling test gas to enter the sealed cladding and an air outlet channel for enabling the test gas to flow out of the sealed cladding. The invention also discloses a multi-channel mixed coal rock mass seepage test method which is completed by using the multi-channel mixed coal rock mass seepage test device and comprises the steps of sample preparation, assembly, connection, test and the like. The invention realizes the series, parallel and series-parallel seepage of different seepage paths, and has more thorough sealing, good stability and more accurate test result, thereby being applicable to all seepage tests.
Description
Technical Field
The invention belongs to the technical field of tests, and relates to a rock mechanical property test device and a rock mechanical property test method, in particular to a multichannel mixed coal rock seepage test device and a multichannel mixed coal rock seepage test method.
Background
At present, for researching the seepage characteristics in coal rock mass, the current seepage tests which can be carried out are as follows: a seepage test in standard coal-rock mass seepage loading damage, a seepage test of a fractured coal-rock mass, and a coal-rock mass seepage test in a scattered state.
The test apparatus for the above test generally has certain drawbacks. Firstly, in the test device, the test sample is sealed by the rubber ring, once the sealing is not thorough, gas flows along the wall of the cylinder barrel, great errors are brought to test results, and the test accuracy is influenced. Secondly, the test device can not research the permeability characteristics of the coal-rock mass seepage channel under the conditions of series connection, parallel connection and series-parallel connection, and has certain limitation.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a multi-channel mixed coal-rock mass seepage test device and method, so that the seepage characteristics of the coal-rock mass seepage channel under the conditions of series connection, parallel connection and series-parallel connection can be researched, and the test error caused by incomplete sealing can be avoided.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a multichannel mixes coal rock mass seepage flow test device, includes at least two sealed claddings that are used for placing the sample, sealed claddings has lateral wall, diapire and roof, and wherein the lateral wall is seal structure, makes the lateral wall of sample is sealed, and diapire and roof are ventilative structure to be provided with down the briquetting at the diapire lower extreme, be provided with the briquetting on the roof upper end, lower briquetting and last briquetting are seted up respectively and are used for making test gas get into the inlet channel of sealed claddings and are used for making test gas flow out the outlet channel of sealed claddings.
As a limitation of the present invention: the number of the sealed enclosures is four.
As a limitation of the present invention: the side wall of each sealed cladding is made of high molecular polymer with the glass transition temperature of 50-100 ℃, and a primary heating cylinder is sleeved outside each sealed cladding.
As a limitation of the present invention: the primary heating cylinder comprises a tubular cylinder body, and a primary heating pipe is arranged in the wall of the cylinder body.
As a limitation of the present invention: the first-stage heating cylinder is sleeved outside the sealing cladding through the seepage main cylinder, the seepage main cylinder comprises a tubular cylinder body sleeved in the first-stage heating cylinder, two end parts of the tubular cylinder body extend outwards to form a flange for positioning the first-stage heating cylinder, and the first-stage heating cylinder is fixed between the two flanges of the seepage main cylinder.
As a limitation of the present invention: the lower pressing blocks are of an integrated structure and form a lower pressing plate covering the bottom walls of all the sealing cladding shells, and the lower pressing plate is connected with the seepage main cylinder through corresponding flanges of the seepage main cylinder.
As a limitation of the present invention: the upper pressing block seals the seepage main cylinder through the upper cover plate.
As a limitation of the present invention: a plurality of one-level heating jar all overlap and locate a dipolar heating jar in, dipolar heating jar includes the tubulose cylinder body, secondary heating pipe has been buried underground in the cylinder body wall.
The invention also discloses a multi-channel mixed coal rock mass seepage test method, which comprises the following steps:
preparing a sample: preparing a standard sample or a multi-stage series sample which is consistent with the size of the multi-channel mixed coal rock mass seepage test device according to test requirements, wherein the total size of the multi-stage series sample is consistent with the size of the standard sample;
assembling: placing the sample in a multi-channel mixed coal rock mass seepage test device in a serial, parallel or series-parallel placing mode, and assembling the multi-channel mixed coal rock mass seepage test device; the serial placing means is used for placing a multistage serial sample into a corresponding sealed enclosure, the parallel placing means is used for placing at least two standard samples into the corresponding sealed enclosures respectively, and the parallel placing means is used for placing at least one multistage serial sample and at least one standard sample into the corresponding sealed enclosures respectively;
connecting: connecting pipelines to an air inlet channel and an air outlet channel with samples, and selecting a serial connection mode, a parallel connection mode or a parallel connection mode according to test requirements; the series connection mode refers to connecting pipelines to an air inlet channel and an air outlet channel for placing a multistage series sample, the parallel connection mode refers to connecting pipelines to an air inlet channel and an air outlet channel for placing a standard sample, and connecting the pipelines end to end respectively, and the series-parallel connection mode refers to connecting pipelines to an air inlet channel and an air outlet channel for placing a multistage series sample and a standard sample, and connecting the pipelines end to end respectively;
and (3) testing: the pressure was set according to the test, ventilation was performed, and the parameters were read.
As a limitation of the present invention: the method is characterized by further comprising a heating step after the assembling step and before the connecting step or after the connecting step and before the testing step, wherein the heating step is as follows: and connecting the corresponding primary heating pipe and the corresponding secondary heating pipe into a heating circuit, controlling the temperature of the corresponding primary heating cylinder, the corresponding secondary heating cylinder and the corresponding seepage main cylinder to rise to 70-90 ℃, keeping for 30-60 min, melting the side wall of the sealed cladding, sealing the gap of the side wall of the sample, closing the heating circuit, and cooling to room temperature to start the next step.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) the invention is provided with a plurality of sealed casings for placing samples, namely a plurality of test channels are arranged in a test device, series seepage of different seepage paths is realized by a method of sectionally combining the samples, parallel seepage of different seepage paths is realized by placing the samples in different test channels and adopting a four-way seepage master cylinder mode, and the parallel seepage is realized by a method of single-cylinder series connection and multi-cylinder parallel connection, so that the series-parallel seepage is realized, and the seepage characteristic of non-uniform media in a mixed coal-rock mass can be more accurately reflected;
(2) the sealed test device is provided with the sealed cladding with the side wall capable of being melted at high temperature, and the primary heating cylinder is arranged outside the sealed cladding, so that the side wall of the sealed cladding can be melted, a series sample can be sealed, a gap between the sample and the seepage main cylinder can be sealed, the phenomenon of gas seepage along the wall is reduced, the sealing is more thorough, and the test result is more accurate; furthermore, a second-stage heating cylinder is arranged outside the first-stage heating cylinder, so that heat loss of the first-stage heating cylinder can be relieved, the sealing shell can be completely melted, and the stability is good.
In conclusion, the invention realizes the series, parallel and series-parallel seepage of different seepage paths, and has the advantages of more thorough sealing, good stability and more accurate test result, thereby being suitable for all coal-rock body seepage tests.
Drawings
The invention is described in further detail below with reference to the figures and the embodiments.
Fig. 1 is a first schematic perspective view of an embodiment 1 of the present invention;
fig. 2 is a schematic perspective view of embodiment 1 of the present invention;
FIG. 3 is a schematic view of the internal structure of embodiment 1 of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3 according to example 1 of the present invention;
FIG. 5 is a top view of example 1 of the present invention;
fig. 6 is a schematic structural view of a lower platen in embodiment 1 of the present invention.
In the figure: 10-sealing cladding, 101-side wall, 102-bottom wall, 103-top wall, 20-seepage main cylinder, 30-primary heating cylinder, 40-primary heating pipe, 50-upper pressing block, 60-primary sealing ring, 70-air outlet channel, 80-upper cover plate, 90-secondary sealing ring, 100-lower pressing plate, 110-seepage main cylinder mounting hole, 120-tertiary sealing ring, 130-air inlet channel, 140-secondary heating cylinder, 150-secondary heating pipe, 160-fixed table base, 170-mounting plate, 180-standard sample and 190-multistage series sample.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the multi-channel mixed coal-rock seepage testing apparatus and method described herein are preferred embodiments, are merely illustrative and explanatory of the invention, and are not restrictive thereof.
The terms "upper", "lower", "left", "right" and the like in the present invention are used in terms of orientation or positional relationship based on the drawings in the present specification, and are only for convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that a device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus should not be construed as limiting the contents of the present invention.
Embodiment 1 multi-channel mixed coal rock mass seepage test device
In the embodiment, as shown in fig. 1 to 6, the multi-channel mixed coal rock mass seepage test device comprises at least two sealed cladding 10 for placing a sample, an air inlet channel 130 for allowing test gas to enter and an air outlet channel 70 for allowing the test gas to flow out are arranged outside the sealed cladding 10, and a pipeline is connected through the air inlet channel 130 and the air outlet channel 70 to perform a seepage test. The sealed enclosure 10 is provided with at least two sealed enclosures, and samples can be connected in series, in parallel or in series and in parallel according to needs. For ease of understanding, fig. 3 is a schematic view of a state in which the samples are placed in the apparatus in a series-parallel manner, wherein the total size of the multi-stage serial samples 190 corresponds to the size of the standard sample 180. In the present embodiment, four mutually parallel sealed enclosures 10 are provided, but of course, other numbers of sealed enclosures 10 may be provided as required.
The sealed enclosure 10 is a hollow cylindrical cavity structure, and includes a cylindrical side wall 101 having a sealed structure, the side wall 101 is made of a high molecular polymer with a glass transition temperature of 50-100 ℃, in this embodiment, the side wall 101 is made of a polylactic acid (PLA) material, so that the side wall 101 can be melted at a high temperature. Of course, other high molecular polymers with a glass transition temperature of 50 to 100 ℃ such as polyvinyl chloride (PVC) and celluloid cellulose may be used for the side wall 101. The lower opening of the side wall 101 is provided with a bottom wall 102, the upper opening of the side wall 101 is provided with a top wall 103, the bottom wall 102 and the top wall 103 are porous gas-permeable circular plate structures, the porous structures can dredge gas in an air inlet channel and an air outlet channel, so that the gas can pass through a sample more uniformly, the cross sections of the circular plate structures of the bottom wall 102 and the top wall 103 are adaptive to the inner wall of the side wall 101, so that the bottom wall 102 and the bottom wall 102 can be plugged into two ends of the side wall 101, and a cavity for containing the sample is formed.
And a seepage main cylinder 20 matched with the outer diameter of the sealing cladding 10 and a primary heating cylinder 30 matched with the outer diameter of the seepage main cylinder 20 are sleeved on the outer side of each sealing cladding 10 in sequence. The one-level heating cylinder 30 includes the tubulose cylinder body that forms by the concatenation of the ring form casing of two halves, and the cylinder body adopts the coefficient of heat conductivity lambda > 50W/M to make as the metal material of K, reserves the way through the one-level heating on the cylinder body inner wall and is provided with the one-level heating pipe 40 spirally ground, and the one-level heating pipe in this embodiment is the copper pipe. The seepage main cylinder 20 comprises a tubular main cylinder body sleeved in the primary heating cylinder 30, the upper end and the lower end of the main cylinder body both extend outwards along the diameter direction to form a flange for positioning the primary heating cylinder 30, so that the primary heating cylinder 30 is fixed between the upper flange and the lower flange of the seepage main cylinder 20, namely the primary heating cylinder 30 is sleeved outside the sealed enclosure 10 through the seepage main cylinder 20. During assembly, the primary heating pipe 10 is wound on the seepage main cylinder 20, and then the two semicircular annular shells are spliced and buckled on the seepage main cylinder 20. Of course, the primary heating cylinder 30 may be provided as an integral structure, a flange at the upper end of the seepage main cylinder 20 is omitted accordingly, and the primary heating cylinder 30 may be directly sleeved on the seepage main cylinder 20 from the upper portion during installation. The arrangement of the first-stage heating cylinder 30 can preheat and melt the side wall 101 of the sealed cladding 10, can seal the multistage series sample 190, can seal gaps among the multistage series sample 190, the standard sample 180 and the seepage main cylinder 20, reduces the phenomenon of gas seepage along the wall, and enables the sealing to be more thorough. The seepage main cylinder 20 is a main place for generating seepage phenomenon, the seepage main cylinder 20 is arranged to limit the seepage direction in the seepage process, so that seepage is along the axis direction of the main cylinder, the side wall 101 of the sealing cladding 10 which is prevented from being melted after heating is attached to the inner wall of the primary heating cylinder 30, after the test is completed, residues attached to the seepage main cylinder 20 can be cleaned, and the deformation of a sample can be limited.
In order to seal the upper end of the hermetic container 10, a cylindrical upper pressing block 50 is provided at the upper end of the top wall 103 of the hermetic container 10. The heights of the seepage main cylinder 20 and the primary heating cylinder 30 are greater than that of the sealing cladding 10, so that the sealing cladding 10 sleeved with the seepage main cylinder 20 and the primary heating cylinder 30 is concave, four sealing claddings 10 are arranged in the embodiment, accordingly, four upper pressing blocks 50 are correspondingly arranged and are respectively inserted into each concave structure, the upper end of each sealing cladding 10 is pressed by the corresponding upper pressing block 50, and the upper end of the inner wall of the seepage main cylinder 20 is provided with a primary sealing ring 60 for sealing between the seepage main cylinder 20 and the corresponding upper pressing block 50. In order to ensure the sealing effect, two primary sealing rings 60 are provided along the height direction of the seepage main cylinder 20. In order to evacuate the sample in the sealed enclosure 10 during the test, an air outlet channel 70 for letting the test gas out of the sealed enclosure 10 is opened in the upper pressure block 50. The height of the upper pressing block 50 in this embodiment is greater than the depth of the recess formed by the sealing cladding 10 and the seepage main cylinder 20, so that the upper pressing block 50 can still protrude from the surface of the recess after being inserted into the recess. Therefore, the gas outlet channel 70 in this embodiment includes a vertical channel disposed at the bottom of the upper pressing block 50 along the vertical direction, and a horizontal channel disposed along the horizontal direction and communicated with the vertical channel, so that the gas outlet channel 70 in the upper pressing block 50 is integrally in an inverted "L" shape, further, as shown in fig. 5, the dotted line in the figure is the disposition position of the gas outlet channel 70, and in order to facilitate the connection of the pipelines in the test process, the horizontal channels of the four gas outlet channels 70 in this embodiment all face the center of the test apparatus.
In order to further fix the seepage main cylinder 20 and the primary heating cylinder 30, an annular upper cover plate 80 is further arranged on the seepage main cylinder 20, the inner diameter of the upper cover plate 80 is equal to the outer diameter of the upper pressing block 50, when the seepage main cylinder 20 is used, the upper cover plate 80 penetrates through the upper pressing block 50, the upper cover plate 80, the flanges of the seepage main cylinder 20 and the primary heating cylinder 30 are sequentially connected through threaded connection, and a secondary sealing ring 90 is arranged between each upper cover plate 80 and the flange of each seepage main cylinder 20.
In order to seal the lower end of the sealed envelope 10, a lower pressing block is provided at the lower end of the bottom wall 102 of the sealed envelope 10, and the lower pressing block is structurally different from the upper pressing block 50 in order to distinguish the two ends of the test piece. In this embodiment, the four lower press blocks are an integral structure, forming a circular lower press plate 100 capable of covering all of the bottom wall 102 of the sealed enclosure 10. A plurality of seepage main cylinder mounting holes 110 are circumferentially distributed on the lower pressure plate 100 (for better clarity, the dotted line in fig. 6 is a schematic position of the seepage main cylinder 20), a flange at the lower end of each seepage main cylinder 20 is in threaded connection with the lower pressure plate 100 through the seepage main cylinder mounting holes 110, and a tertiary seal ring 120 is arranged between the flange at the lower end of each seepage main cylinder 20 and the lower pressure plate 100. In order to ventilate the test sample in the sealed enclosure 10 during the test, an air inlet channel 130 for allowing the test gas to enter the sealed enclosure 10 is opened on the lower pressure block. The air inlet passage 130 in this embodiment is a through hole formed in the lower pressure block and opposed to the sample position.
In order to alleviate the heat loss of the first-stage heating cylinders 30, two-stage heating cylinders 140 are sleeved outside the four first-stage heating cylinders 30. The second-stage heating cylinder 140 comprises a cylindrical cylinder body made of a metal material with a thermal conductivity coefficient lambda larger than 50W/M as K, a through hole for placing the four first-stage heating cylinders 30 is formed in the cylindrical cylinder body, a second-stage heating pipe 150 is embedded in the cylinder body wall through a second-stage heating reserved channel, and the second-stage heating pipe in the embodiment is a copper pipe. Wherein, the diameter of the lower press plate 100 is equal to the outer diameter of the secondary heating cylinder 140, so that the secondary heating cylinder 140 is connected with the lower press plate 100 through a screw connection.
In order to facilitate the gas to enter the sample through the lower pressure plate 100 during the experiment, a fixed base 160 is fixedly arranged at the lower end of the lower pressure plate 100. The main body of the fixed table base 160 is a circular ring structure with the outer diameter being the same as the diameter of the lower pressing plate 100, a circular mounting piece 170 is fixedly arranged on the upper end face of the main body structure in the circumferential direction, and a through hole is formed in the mounting piece 170, so that the fixed table base 160 is in threaded connection with the lower pressing plate 100 through the circular mounting piece 170.
It should be noted that the multichannel mixed coal rock mass seepage test device in the embodiment can be used for not only performing a gas seepage test but also performing a liquid seepage test, and has a wide application range.
Example 2 Multi-channel mixed coal rock mass seepage test method
The embodiment is a multi-channel mixed coal rock mass seepage test method which is completed by using the multi-channel mixed coal rock mass seepage test device in the embodiment 1 and comprises the following steps:
preparing a sample: according to the test requirement, preparing a standard sample or a multi-stage series sample which is consistent with the size of the multi-channel mixed coal rock mass seepage test device, and for the convenience of understanding, fig. 3 is a schematic diagram of a state that the sample is placed in the device in a mixed connection mode, wherein the total size of the multi-stage series sample 190 is consistent with the size of the standard sample 180. This example was run in a series-parallel seepage test involving a multi-stage series sample and three standard samples.
Assembling: the sample is placed in a multi-channel mixed coal rock mass seepage test device in a series-parallel placing mode, in the embodiment, a series sample and three standard samples 180 are taken, the top wall 103 or the bottom wall 102 of the sealed cladding 10 is detached from the side wall 101, the corresponding samples are respectively placed in the corresponding sealed cladding 10, the detached top wall 103 or bottom wall 102 is placed into the side wall 101, the side wall 101 completely wraps the top wall 103, the sample and the bottom wall 102, and the multi-channel mixed coal rock mass seepage test device is assembled. Wherein, assemble the mixed coal rock mass seepage flow test device of multichannel and include following step:
the method comprises the following steps: respectively penetrating the spiral primary heating pipes 40 into each primary heating cylinder 30 through the primary heating reserved channel;
step two: sleeving the assembled primary heating cylinder 30 outside the seepage main cylinder 20, so that the primary heating cylinder 30 is fixed between an upper flange and a lower flange of the seepage main cylinder 20;
step three: a third-level sealing ring 120 is mounted on a flange at the lower end of the seepage main cylinder 20, and the flange at the lower end of the seepage main cylinder 20 is hermetically fixed on the lower pressure plate 100 by using a fixing bolt;
step four: the secondary heating pipe 150 is inserted into the secondary heating cylinder 140 through the secondary heating pipe pre-reserved passage, and the secondary heating cylinder 140 is installed and fixed on the lower pressing plate 100 by using a fixing bolt;
step five: placing the assembly obtained in the fourth step on a fixed table base 160, and connecting and fixing the assembly and the fixed table base by using bolts;
step six: installing a primary sealing ring 60 on the inner wall of the seepage main cylinder 20, and inserting an upper pressing block 50 into the concave structure of the seepage main cylinder 20;
step seven: placing a secondary sealing ring 90 on the flange of each seepage main cylinder 20, sealing each seepage channel by using an upper cover plate 80, and fixing the upper cover plate 80 by using bolts;
step eight: the test apparatus was placed on a press, and the press was used to apply pressure to the upper press block 50 to bring the components in the seepage master cylinder 20 into close contact.
Connecting: connecting the pipelines to the gas inlet channel 130 and the gas outlet channel 70 with the samples, and selecting a serial connection mode, a parallel connection mode or a parallel connection mode according to the test requirement; in the embodiment, a series-parallel seepage test is performed, the gas outlet channels 70 are respectively connected with gas outlet pipelines, and each gas outlet pipeline is provided with a flow meter and a press machine so as to measure the gas motion parameters of each channel; the gas outlet pipelines of each channel are connected in parallel by utilizing a five-way valve, even if the pipelines are connected and converged at the tail end, a flowmeter and a press machine are arranged on the converged pipelines to measure the total gas motion parameters, and the converged pipelines are connected into a gas extraction pump in a unified way; the air inlet channels 130 are respectively connected with air inlet pipelines, the air inlet pipelines of each channel are connected in parallel by utilizing the five-way valve, even if the pipelines are connected and converged end to end, and the converged pipelines are uniformly connected into a gas pressure environment to be tested.
Heating: and (3) connecting the corresponding first-stage heating pipe 40 and the corresponding secondary heating pipe 150 into a heating circuit, controlling the corresponding first-stage heating cylinder 30, second-stage heating cylinder 140 and seepage main cylinder 20 to heat to 70 ℃, keeping for 50min, melting the side wall 101 of the sealed cladding 10, sealing the gap of the side wall of the sample, closing the heating circuit, and cooling to room temperature.
And (3) testing: and (3) according to the set pressure of the test, starting the air pump to ventilate, reading the gas flow and pressure parameters of each channel and the total channel, closing the air pump and the five-way valve after the permeation is finished, and splitting the test device. The method mainly comprises the following steps of splitting a multi-channel mixed coal rock mass seepage test device:
the method comprises the following steps: disassembling the upper pressing block 50 and the upper cover plate 80, controlling the primary heating cylinder 30 and the secondary heating cylinder 140 by using the primary heating pipe 40 and the secondary heating pipe 150, heating the seepage main cylinder 20 to soften the side wall 101 of the sealing cladding 10, keeping the softened state, taking out the sample, and cleaning the sealing cladding 10 residue on the seepage main cylinder 20;
step two: and (3) closing the heating circuit, and after the sample is cooled to room temperature, sequentially detaching the fixed table base 160, the secondary heating cylinder 140, the primary heating cylinder 30 and the seepage main cylinder 20.
It should be noted that the primary heating pipe 40 and the secondary heating pipe 150 need to penetrate into each of the primary heating cylinder 30 and the secondary heating cylinder 140 only during the initial test, and the primary heating pipe 40 and the secondary heating pipe 150 need not to be disassembled after the initial test, and can be directly used during the next test.
The connection mode of the series-parallel connection refers to that at least one multistage series sample and at least one standard sample are connected in parallel, the series-parallel connection in the embodiment comprises one multistage series sample and three standard samples, the number of the series samples and the number of the standard samples can be adjusted according to needs in the test, for example, under the condition that four channels are arranged in the embodiment 1, two multistage series samples and two standard samples can be placed, and three multistage series samples and one standard sample can also be placed. Of course, it is also possible to place a multi-stage serial sample and a standard sample using only two or three of the four channels, to place a multi-stage serial sample and two standard samples, or to place at least one multi-stage serial sample and at least one standard sample in any other way. The same operation occurs when the total number of channels in the assay device is changed. When the connection mode is changed, the five-way valve is correspondingly adjusted to be a four-way valve, a three-way valve and other valves meeting the connection requirement.
Example 3 Multi-channel mixed coal rock mass seepage test method
The embodiment is a multi-channel mixed coal rock mass seepage test method, which is completed by using the multi-channel mixed coal rock mass seepage test device in embodiment 1, and the steps of the embodiment are substantially the same as those of embodiment 2, except for the connection mode of samples and part of sequences and parameters in the test process, the following description is mainly directed to the differences, and the embodiment performs a parallel seepage test, and includes the following steps:
preparing a sample: in the embodiment, a parallel seepage test is carried out, and four standard samples with the size consistent with that of the multi-channel mixed coal rock mass seepage test device are prepared.
Assembling: the samples are placed in a multi-channel mixed coal rock mass seepage test device in a parallel connection mode, four standard samples are respectively placed in corresponding sealing cladding 10, the multi-channel mixed coal rock mass seepage test device is assembled, and the placing steps of the samples and the assembling steps of the test device are the same as those of the embodiment 1.
Heating: and (3) connecting the corresponding first-stage heating pipe 40 and the corresponding secondary heating pipe 150 into a heating circuit, controlling the corresponding first-stage heating cylinder 30, second-stage heating cylinder 140 and seepage main cylinder 20 to be heated to 90 ℃, and keeping for 30min to melt the side wall 101 of the sealed cladding 10, so as to seal the gap of the side wall of the sample, closing the heating circuit, and cooling to room temperature.
Connecting: connecting the pipelines to the gas inlet channel 130 and the gas outlet channel 70 with the samples, and selecting a serial connection mode, a parallel connection mode or a parallel connection mode according to the test requirement; in this embodiment, a parallel seepage test is performed, and on the basis that the four samples are all the standard samples 180, the pipelines are respectively connected end to end and end to end, which is the same as the connection steps in embodiment 2.
And (3) testing: the experimental procedure and the resolution procedure in this example were the same as in example 1.
The parallel connection mode refers to a connection mode of connecting at least two standard samples in parallel, the parallel connection in this embodiment includes four standard samples, the number of the standard samples can be adjusted as required in the test, for example, in the case of having four channels in embodiment 1, two or three parallel standard samples can be placed by using only two or three of the four channels. The same operation occurs when the total number of channels in the assay device is changed. When the connection mode is changed, the five-way valve is correspondingly adjusted to be a four-way valve, a three-way valve and other valves meeting the connection requirement.
Example 4 Multi-channel mixed coal rock mass seepage test method
The embodiment is a multi-channel mixed coal rock mass seepage test method, which is completed by using the multi-channel mixed coal rock mass seepage test device in embodiment 1, and the steps of the embodiment are substantially the same as those of embodiment 2, except for the connection mode of samples and part of sequences and parameters in the test process, the following description is mainly directed to the differences, and the embodiment performs a series seepage test, and includes the following steps:
preparing a sample: in the embodiment, a series seepage test is carried out, a multi-stage series sample which is consistent with the size of the multi-channel mixed coal rock mass seepage test device is prepared, and the total size of the multi-stage series sample is matched with the cavity of the sealed cladding 10 of the test device.
Assembling: the samples are placed in a multi-channel mixed coal rock mass seepage test device in a serial connection mode, the multi-stage serial samples are taken and placed into the corresponding sealing cladding 10, and the multi-channel mixed coal rock mass seepage test device is assembled. The assembly procedure of this embodiment is substantially the same as that of embodiment 1, except that only one passage is required for the completion of the serial permeation test, and thus only the corresponding primary heating cylinder 30 and secondary heating cylinder 140 are installed and fixed.
Connecting: connecting the pipelines to the gas inlet channel 130 and the gas outlet channel 70 with the samples, and selecting a serial connection mode, a parallel connection mode or a parallel connection mode according to the test requirement; this example was conducted by performing a serial percolation test by connecting the pipes to the inlet channel 130 and the outlet channel 70 in which the multi-stage serial samples were placed. The difference from embodiment 1 is that since the series connection does not involve the difference between each channel and the collecting channel, the five-way valve is replaced with a normal valve, and only one set of a flow meter and a pressure gauge is provided in the outlet line when connected.
Heating: and (3) connecting the corresponding first-stage heating pipe 40 and the corresponding secondary heating pipe 150 into a heating circuit, controlling the corresponding first-stage heating cylinder 30, second-stage heating cylinder 140 and seepage main cylinder 20 to heat to 80 ℃, keeping for 60min, melting the side wall 101 of the sealed cladding 10, sealing the gap of the side wall of the sample, closing the heating circuit, and cooling to room temperature.
And (3) testing: the test procedure and the splitting procedure in this example were the same as in example 1, except for the number of percolation channels and the type of valve.
The serial connection mode is a connection mode in which a multistage serial pattern is connected to a test apparatus, and a multistage serial sample may be placed in any one of the channels and tested for the channel. The number of the components of the multistage series connection sample and the thickness of each component can be adjusted as required, and the total size of the multistage series connection sample is consistent with that of the standard sample, so that the superimposed multistage series connection sample can be matched with a test device. The same operation occurs when the total number of channels in the assay device is changed.
Claims (10)
1. The multi-channel mixed coal rock mass seepage test device is characterized by comprising at least two sealed cladding shells for placing samples, wherein each sealed cladding shell is provided with a side wall, a bottom wall and a top wall, the side walls are of a sealing structure and enable the side walls of the samples to be sealed, the bottom walls and the top walls are of a ventilation structure, a lower pressing block is arranged at the lower end of the bottom walls, an upper pressing block is arranged at the upper end of the top walls, and an air inlet channel for enabling test gas to enter the sealed cladding shells and an air outlet channel for enabling the test gas to flow out of the sealed cladding shells are respectively formed in the lower pressing block and the upper pressing block.
2. The multi-channel mixed coal rock mass seepage test device according to claim 1, wherein four sealing cladding are arranged.
3. The multichannel mixed coal-rock mass seepage test device as claimed in claim 2, wherein the side wall of the sealed cladding is made of high-molecular polymer with the glass transition temperature of 50-100 ℃, and a primary heating cylinder is sleeved outside each sealed cladding.
4. The multi-channel mixed coal rock mass seepage test device according to claim 3, wherein the primary heating cylinder comprises a tubular cylinder body, and a primary heating pipe is arranged in the wall of the cylinder body.
5. The multi-channel mixed coal rock mass seepage test device according to claim 4, wherein the primary heating cylinder is sleeved outside the sealing cladding through a seepage main cylinder, the seepage main cylinder comprises a tubular cylinder body sleeved in the primary heating cylinder, two end parts of the tubular cylinder body extend outwards to form a flange for positioning the primary heating cylinder, and the primary heating cylinder is fixed between the two flanges of the seepage main cylinder.
6. The multi-channel mixed coal-rock mass seepage testing device of claim 5, wherein the plurality of lower pressing blocks are of an integrated structure and form a lower pressing plate covering the bottom wall of all the sealing cladding, and the lower pressing plate is connected with the seepage main cylinder through corresponding flanges of the seepage main cylinder.
7. The multi-channel mixed coal rock mass seepage test device according to claim 6, wherein the upper pressing block seals the seepage main cylinder through an upper cover plate.
8. The multichannel mixed coal-rock mass seepage test device of claim 7, wherein the plurality of primary heating cylinders are all sleeved in a secondary heating cylinder, the secondary heating cylinder comprises a tubular cylinder body, and a secondary heating pipe is buried in the wall of the cylinder body.
9. A multi-channel mixed coal rock mass seepage test method is characterized by comprising the following steps:
preparing a sample: preparing a standard sample or a multi-stage series sample which is consistent with the size of the multi-channel mixed coal rock mass seepage test device according to test requirements, wherein the total size of the multi-stage series sample is consistent with the size of the standard sample;
assembling: placing the sample in a multi-channel mixed coal rock mass seepage test device in a serial, parallel or series-parallel placing mode, and assembling the multi-channel mixed coal rock mass seepage test device; the serial placing means is used for placing a multistage serial sample into a corresponding sealed enclosure, the parallel placing means is used for placing at least two standard samples into the corresponding sealed enclosures respectively, and the parallel placing means is used for placing at least one multistage serial sample and at least one standard sample into the corresponding sealed enclosures respectively;
connecting: connecting pipelines to an air inlet channel and an air outlet channel with samples, and selecting a serial connection mode, a parallel connection mode or a parallel connection mode according to test requirements; the series connection mode refers to connecting pipelines to an air inlet channel and an air outlet channel for placing a multistage series sample, the parallel connection mode refers to connecting pipelines to an air inlet channel and an air outlet channel for placing a standard sample, and connecting the pipelines end to end respectively, and the series-parallel connection mode refers to connecting pipelines to an air inlet channel and an air outlet channel for placing a multistage series sample and a standard sample, and connecting the pipelines end to end respectively;
and (3) testing: the pressure was set according to the test, ventilation was performed, and the parameters were read.
10. The multi-channel mixed coal rock mass seepage test method according to claim 9, characterized by further comprising a heating step after the assembling step and before the connecting step or after the connecting step and before the testing step, wherein the heating step is as follows: and connecting the corresponding primary heating pipe and the corresponding secondary heating pipe into a heating circuit, controlling the temperature of the corresponding primary heating cylinder, the corresponding secondary heating cylinder and the corresponding seepage main cylinder to rise to 70-90 ℃, keeping for 30-60 min, melting the side wall of the sealed cladding, sealing the gap of the side wall of the sample, closing the heating circuit, and cooling to room temperature to start the next step.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11714042B1 (en) * | 2022-04-01 | 2023-08-01 | Southwest Petroleum University | Reversible plugging-type device for preventing seepage from side wall of irregular sample |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11714042B1 (en) * | 2022-04-01 | 2023-08-01 | Southwest Petroleum University | Reversible plugging-type device for preventing seepage from side wall of irregular sample |
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