CN109959578B - Testing instrument for rock gas high-pressure adsorption and testing method thereof - Google Patents
Testing instrument for rock gas high-pressure adsorption and testing method thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 220
- 239000011435 rock Substances 0.000 title claims abstract description 119
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 328
- 239000001307 helium Substances 0.000 claims abstract description 80
- 229910052734 helium Inorganic materials 0.000 claims abstract description 80
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000006185 dispersion Substances 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 8
- 239000010985 leather Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 2
- 230000035882 stress Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
- G01N7/04—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder by absorption or adsorption alone
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Abstract
The invention discloses a testing instrument for rock gas high-pressure adsorption and a testing method thereof. The device comprises a constant temperature system, a fixed unit for testing a rock test piece, a buffer gas tank, a helium gas tank, a test gas tank, an oil pump, a gas pipeline, a barometer and a gas switch, wherein the fixed unit comprises an upper cover, a unit main body, a lower seat and a fixed bolt; the constant temperature system is externally provided with a helium gas storage tank, a test gas storage tank, a helium switch and a test gas switch, and the buffer gas tank is respectively communicated with the helium gas storage tank and the test gas storage tank through helium gas and test gas pipelines. The device has the characteristics of simple structure, convenient assembly, safe and reliable work and the like.
Description
Technical Field
The invention relates to a testing instrument for rock gas high-pressure adsorption and a testing method thereof.
Background
The rock gas high-pressure adsorption phenomenon has very important significance in various fields, for example, the gas high-pressure adsorption of coal rock/shale directly determines the gas reserves of the coal rock/shale, and further determines the economy of a mining project, and the gas high-pressure adsorption capacity of mudstone/salt rock is an important evaluation factor for evaluating the gas tightness and the gas sealing quantity of the rock, and has important roles in the aspects of natural gas storage and carbon dioxide geological storage. The invention discloses a testing method and a testing instrument for measuring rock mass constant temperature adsorption and monitoring rock mass strain in a Chinese patent specification CN105043920A, which belong to the testing method and the testing instrument for rock mass constant temperature and rock mass strain. According to the testing method, the constant-temperature adsorption capacity of the rock mass is tested through an indirect gravity method, meanwhile, transverse strain gages and longitudinal strain gages can be attached to the side face of a tested sample, and the strain condition of the rock sample is monitored in the process that the rock sample reaches adsorption balance, so that the relationship between rock mass adsorption and rock mass microscopic stress can be analyzed conveniently; and a plurality of adsorption tanks are additionally arranged to simultaneously carry out adsorption tests on rock samples in different particle size ranges, the particle size measurement range of rock mass samples is wide, and the particle size measurement range covers 100 mu m-20mm. The method for measuring the constant-temperature adsorption of the rock mass and monitoring the strain of the rock mass calculates the adsorption quantity of the sample by weighing through a high-precision balance, and is different from the prior volumetric method for measuring the adsorption quantity. Can be used for determining the adsorption amount of rock to gas in laboratories, test enterprises and government departments. The test instrument is single, the number of the connecting parts is small, the tightness of the system is enhanced, the operation is simple, the calculation method is simple and reliable, and the accuracy is high. At present, the rock gas high-pressure adsorption only focuses on the influence of conditions such as temperature and pressure of test gas on the rock adsorption, but does not focus on the influence of the state of the rock on the result, and particularly the change rule of the rock high-pressure adsorption under different underground environmental stress conditions, so that the recognition of the rock gas high-pressure adsorption cannot be further improved.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide a testing instrument for rock gas high-pressure adsorption. The device has the characteristics of simple structure, convenient assembly, safe and reliable work and the like. Not only can the high-pressure gas adsorption rule of the large rock centimeter-level test piece under different temperatures and gas pressures be obtained rapidly and simply; the stress environment of the rock can be changed through the confining pressure of the fixing unit, the stress state of the rock in the underground is truly simulated, the gas high-pressure adsorption rule of the rock in different stress states is searched, and a powerful foundation guarantee is provided for improving the gas exploitation efficiency of the gas-enriched rock and increasing the gas storage capacity of the sealed rock.
In order to solve the technical problems, the invention provides a testing instrument for rock gas high-pressure adsorption. The device comprises a constant temperature system, a fixing unit for testing a rock test piece, a buffer gas tank, a helium gas storage tank, a test gas storage tank, an oil pump, an oil circuit, a gas pipeline, a barometer and a gas switch, wherein the gas switch comprises an upper gas inlet switch, a lower gas inlet switch, a helium gas switch and a test gas switch; the constant temperature system is externally provided with a helium gas storage tank, a test gas storage tank, a helium switch and a test gas switch, the buffer gas tank is respectively communicated with the helium gas storage tank and the test gas storage tank through helium gas and test gas pipelines, and the helium gas and the test gas pipelines are respectively provided with the helium switch and the test gas switch.
The upper and lower both sides of test rock test piece all install the gas dispersion piece, like this, the upper and lower both sides of test rock test piece installation gas dispersion piece carries out dispersion treatment to the gas access route, lets the gas access route more even (as shown in fig. 2), establishes the pressure head above the test rock test piece, and the test rock test piece passes through the base to be fixed to be established on the lower seat to adopt rubber leather sheath and metal hoop to seal.
The buffer gas tank is used for providing pressure for porosity test, and buffer gas tank upper end is connected with the test rock test piece of fixed unit main part inner chamber through last air inlet pipeline, and buffer gas tank lower extreme is connected with the test rock test piece of fixed unit inner chamber through lower air inlet pipeline.
The helium storage tank is used for providing helium for the buffer gas tank and calibrating the pore volume of the rock, is communicated with the buffer gas tank through a helium and test gas pipeline, and is provided with a helium switch on the helium and test gas pipeline.
The test gas storage tank is used for providing test gas for the buffer gas tank, is communicated with the buffer gas tank through helium and a test gas pipeline, and is provided with a test gas switch on the helium and the test gas pipeline.
The barometer is used for measuring the pressure of gas, and the barometer is used for testing the gas pressure of the buffer gas tank.
The oil pump is used for providing confining pressure for the inner cavity of the unit main body of the fixed unit, and the oil pump is provided with an oil pressure gauge for measuring confining pressure of the inner cavity of the unit main body of the fixed unit.
The gas switch is used for controlling the flow of gas in the pipeline, wherein the upper gas inlet switch controls the upper gas inlet pipeline of the fixing unit, the lower gas inlet switch controls the lower gas inlet pipeline of the fixing unit, and the helium switch and the test gas switch respectively control the helium gas storage tank and the test gas storage tank to be gas pipelines for filling gas into the buffer gas tank.
Compared with the prior art, the invention has the beneficial effects that: by adopting the structure, when the gas-storage device is used, the gas-storage device can quickly and simply obtain the gas high-pressure adsorption rules of the large-scale rock centimeter-level test piece under different temperatures and gas pressures, and most importantly, the stress environment of the rock can be changed through the confining pressure of the fixed unit, so that the stress state of the rock in the underground can be truly simulated, the gas high-pressure adsorption rules of the rock under different stress states can be searched, and a powerful basic guarantee is provided for improving the gas exploitation efficiency of gas-enriched rock and increasing the gas storage capacity of sealed rock.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of an enlarged structure of a test piece of the present invention;
In the figure: the device comprises a 1-upper cover, a 2-unit main body, a 3-test rock test piece, a 4-fixing bolt, a 5-lower seat, a 6-base, a 7-oil circuit, an 8-oil pump, a 9-constant temperature system, 10-helium and test gas pipelines, an 11-helium switch, a 12-test gas switch, a 13-test gas storage tank, a 14-helium storage tank, a 15-buffer gas tank, a 16-upper gas inlet pipeline, a 17-barometer, an 18-upper gas inlet switch, a 19-lower gas inlet switch, a 20-lower gas inlet pipeline, a 21-gas dispersion sheet, a 22-pressure head, a 23-metal hoop and a 24-rubber leather sheath.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 and 2 show various structural schematic diagrams of the present invention. As shown in fig. 1, the present invention provides a test instrument for rock gas high pressure adsorption. The test rock test piece 3 comprises a constant temperature system 9, a fixing unit for testing the rock test piece 3, a buffer gas tank 15, a helium gas storage tank 14, a test gas storage tank 13, an oil pump 8, an oil way 7, a gas pipeline, a barometer 17 and a gas switch, wherein the gas switch comprises an upper gas inlet switch 18, a lower gas inlet switch 19, a helium gas switch 11 and a test gas switch 12, the gas pipeline comprises an upper gas inlet pipeline 16, a lower gas inlet pipeline 20 and a test gas pipeline 10, the fixing unit, the buffer gas tank 15, the oil pump 8, the oil way 7, the upper gas inlet pipeline 16, the lower gas inlet pipeline 20, the barometer 17 and the upper gas inlet switch 18 are arranged in the constant temperature system 9, the fixing unit comprises an upper cover 1, a unit main body 2, a lower seat 5 and a fixing bolt 4, the unit main body 2 is arranged on the lower seat 5, the lower seat 5 is connected with the upper cover 1 through the fixing bolt 4, the test rock test piece 3 is arranged in the unit main body 2, namely, gas dispersing pieces 21 are arranged on the upper side and lower side of the test rock test piece 3 to disperse the gas entering paths of the test rock test piece 3, and the gas entering paths are more uniform (as shown in figure 2). The sum of all volumes in the closed gas line consisting of the upper inlet switch 18, the lower inlet switch 19, the helium switch 11 and the test gas switch 12, including the volume of the buffer gas tank 15 and the volume of the gas line connected thereto, has been determined by the standard as V 1. The diameter of the test rock test piece 3 is 50cm, and the height is 20-100 mm. The upper and lower ends of the buffer gas tank 15 are respectively connected with a fixed unit through an upper gas inlet pipeline 16 and a lower gas inlet pipeline 20, an upper gas inlet switch 18 and a gas pressure meter 17 are arranged on the upper gas inlet pipeline 16, a lower gas inlet switch 19 is arranged on the lower gas inlet pipeline 20, and an oil pump 8 is communicated with the inner cavity of a unit main body 2 of the fixed unit through an oil way 7; the outside of the constant temperature system 9 is provided with a helium storage tank 14, a test gas storage tank 13, a helium switch 11 and a test gas switch 12, a buffer gas tank 15 is respectively communicated with the helium storage tank 14 and the test gas storage tank 13 through helium and test gas pipelines 10, and the helium and test gas pipelines 10 are respectively provided with the helium switch 11 and the test gas switch 12. The gas dispersion sheets 21 are installed at both upper and lower sides of the test rock specimen 3, and the gas dispersion sheets 21 disperse gas and then uniformly permeate from the entire surface of the test rock specimen 3 instead of from the point of the gas pipe. Thus, the gas dispersing sheets 21 are arranged on the upper side and the lower side of the test rock test piece 3 to disperse the gas entering paths, so that the gas entering paths are more uniform (as shown in fig. 2), the pressure head 22 is arranged on the test rock test piece 3, and the test rock test piece 3 is fixedly arranged on the lower seat 5 through the base 6 and is sealed by the rubber leather sheath 24 and the metal hoops 23. Namely, gas dispersion sheets 21 are arranged on the upper side and the lower side of the test rock test piece 3, the lower side of the test rock test piece 3 is arranged on a base 6, the base 6 is arranged on a lower seat 5, a pressure head 22 is arranged on the test rock test piece 3, the test rock test piece 3 is fixedly arranged on the lower seat 5 through the base 6, and a rubber leather sleeve 24 and a metal hoop 23 are used for sealing. The buffer gas tank 15 is used for providing pressure for porosity test, the upper end of the buffer gas tank 15 is connected with the test rock test piece 3 in the inner cavity of the fixed unit main body 2 through the upper gas inlet pipeline 16, and the lower end of the buffer gas tank 15 is connected with the test rock test piece 3 in the inner cavity of the fixed unit through the lower gas inlet pipeline 20. The helium storage tank 14 is used for providing helium for the buffer gas tank 15 and calibrating the pore volume of the rock, the helium storage tank 14 is communicated with the buffer gas tank 15 through the helium and test gas pipeline 10, and the helium switch 11 is arranged on the helium and test gas pipeline 10. The test gas storage tank 13 is configured to provide test gas for the buffer gas tank 15, the test gas storage tank 13 is connected to the buffer gas tank 15 through the helium and test gas pipeline 10, and the helium and test gas pipeline 10 is provided with the test gas switch 12. The barometer 17 is used for measuring the pressure of the gas, and the barometer 17 is used for testing the gas pressure of the buffer gas tank 15. The oil pump 8 is used for providing confining pressure for the inner cavity of the unit main body 2 of the fixed unit, and the oil pump 8 is provided with an oil pressure gauge for measuring confining pressure of the inner cavity of the unit main body 2 of the fixed unit. The gas switch is used for controlling the flow of gas in the pipeline, wherein the upper gas inlet switch 18 controls the upper gas inlet pipeline 16 of the fixed unit, the lower gas inlet switch 19 controls the lower gas inlet pipeline 20 of the fixed unit, and the helium switch 11 and the test gas switch 12 respectively control the helium gas storage tank 14 and the test gas storage tank 13 to be gas pipelines for filling gas into the buffer gas tank 15.
The invention can not only rapidly and simply obtain the high-pressure gas adsorption rule of the large-scale rock cm-level test piece under different temperatures and gas pressures, but also change the stress environment of the rock by the confining pressure of the fixed unit, truly simulate the stress state of the rock in the underground, search the high-pressure gas adsorption rule of the rock under different stress states, and provide a powerful foundation guarantee for improving the gas exploitation efficiency of gas-enriched rock and increasing the gas storage capacity of sealed rock.
The test principle of the invention is an ideal gas equation:
PV＝nRT
where P is the pressure of the ideal gas, typically in atm or kPa; v is the volume of ideal gas, and the unit is L;
n is the amount of gaseous species in the ideal gas in mol; r is an ideal gas constant, 8.314J/mol.K; t is the absolute temperature of the ideal gas in K. Firstly, helium gas is used as calibration gas, rock pore volume is calculated by using the change of gas pressure, and then a test gas filling volume is adopted, wherein compared with the helium test volume, the redundant volume gas molecules are adsorption molecular weight. The sum of all volumes in the closed gas line consisting of the upper inlet switch 18, the lower inlet switch 19, the helium switch 11 and the test gas switch 12, including the volume of the buffer gas tank 15 and the volume of the gas line connected thereto, has been determined by the standard as V 1. The diameter of the test rock test piece 3 is 50cm, and the height is 20-100 mm.
The test method of the test instrument for rock gas high-pressure adsorption comprises the following steps of:
(1) The diameter D and the height H of the rock test piece 3 are tested by adopting a vernier caliper, and the volume V S of the test piece is calculated:
(2) The installation fixing unit and the connecting gas pipeline are as shown in figure 1, the rock test piece of the test piece and the cylindrical steel test piece with the same volume are installed, all the switches are determined to be closed, and the constant temperature system 9 is opened to set the fixed temperature T 1.
(3) The manual oil pump 8 valve is opened to supply the confining pressure Pv to the inside of the fixed unit main body 2.
(4) Opening helium switch 11 to charge buffer tank 15 with helium gas and provide pressure (less than P V); closing the helium switch 11, and recording the pressure P 1 of the barometer 17 after the gas pressure is stable;
(5) The lower air inlet switch 19 and the upper air inlet switch 18 are opened, and after the air pressure is stable, the pressure P 2 is displayed by the barometer 17; according to an ideal gas equation, the equal volume V 2 of the sealing pipeline of the lower air inlet switch 19 and the upper air inlet switch 18 and the gas dispersion piece 21 is calculated as follows:
(6) The lower air inlet switch 19 is closed, the manual oil pump 8 is closed and removed, the fixing unit is disassembled, the cylindrical steel test piece is taken out, the test rock test piece 3 is installed in the unit main body 2 of the fixing unit, and the gas pipeline is connected as shown in fig. 1.
(7) The manual oil pump 8 is installed and opened, the confining pressure oil is supplied to the fixing unit, and the confining pressure Pv is applied.
(8) Opening the helium switch 11 to provide pressure (less than P V) for the buffer gas tank 15, closing the helium switch 11, and recording the reading of the barometer 17 as pressure P 1 after the gas pressure is stable;
(9) After 6 hours, the lower air inlet switch 19 and the upper air inlet switch 18 are turned on, the barometer 17 is recorded to display the reading as the pressure P 3, and according to an ideal gas equation, the pore volume V 3 of the test rock test piece 3 is calculated according to the following formula:
(11) The lower air inlet switch 19 and the upper air inlet switch 18 are closed and removed, helium gas in the buffer gas tank 15 and the connected gas pipeline is released, and after 4 hours, the lower air inlet switch 19 and the upper air inlet switch 18 are reconnected.
(12) Opening the test gas switch 12 to charge the buffer gas tank 15 with test gas and provide pressure (less than P V); closing the helium switch 11, and recording the pressure P 1 of the barometer 17 after the gas pressure is stable;
(13) After 6 hours, the lower air inlet switch 19 and the upper air inlet switch 18 are turned on, the barometer 17 is recorded to display the pressure P 4, and the pore volume V 3 of the test rock test piece 3 is calculated according to the ideal gas equation as follows:
(14) The adsorption quantity n of the test gas in unit volume of the test rock test piece 3 under the temperature T 1, the confining pressure Pv and the gas pressure P 4 is as follows:
The above operation steps are tested for the adsorption quantity n of the unit volume of the rock sample under the action of the fixed temperature, the confining pressure and the gas pressure, so that the adsorption quantity n of the unit volume of the rock sample 3 can be tested by changing parameters such as the temperature, the confining pressure and the gas pressure of the constant temperature system 9, and the change rule of the adsorption quantity n is obtained.
While the present invention has been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various modifications may be made thereto within the knowledge of those skilled in the art.
Claims (10)
1. The utility model provides a test instrument for rock gas high pressure adsorbs, it includes constant temperature system (9), be used for testing the fixed unit of rock test piece (3), buffer gas jar (15), helium gas holder (14), test gas holder (13), oil pump (8), oil circuit (7), gas pipeline, barometer (17) and gas switch, gas switch includes upper air inlet switch (18), lower air inlet switch (19), helium switch (11) and test gas switch (12), the gas pipeline includes upper air inlet pipeline (16), lower air inlet pipeline (20) and helium and test gas pipeline (10), its characterized in that: the constant temperature system (9) is internally provided with a fixing unit, a buffer gas tank (15), an oil pump (8), an oil way (7), an upper gas inlet pipeline (16), a lower gas inlet pipeline (20), a barometer (17) and an upper gas inlet switch (18), a lower gas inlet switch (19), wherein the fixing unit comprises an upper cover (1), a unit main body (2), a lower seat (5) and a fixing bolt (4), the lower seat (5) is provided with the unit main body (2) and is provided with the upper cover (1) through the fixing bolt (4), a test rock test piece (3) is arranged in the unit main body (2), the test rock test piece (3) is arranged on the lower seat (5), the upper end and the lower end of the buffer gas tank (15) are respectively connected with the fixing unit through the upper gas inlet pipeline (16) and the lower gas inlet pipeline (20), the upper gas inlet switch (18) and the barometer (17) are arranged on the upper gas inlet pipeline (16), the lower gas inlet switch (19) is arranged on the lower gas inlet pipeline (20), and the oil pump (8) is communicated with an inner cavity (2) of the fixing unit through the oil way (7); the outside of the constant temperature system (9) is provided with a helium gas storage tank (14), a test gas storage tank (13), a helium gas switch (11) and a test gas switch (12), the buffer gas tank (15) is respectively communicated with the helium gas storage tank (14) and the test gas storage tank (13) through helium gas and a test gas pipeline (10), and the helium gas and the test gas pipeline (10) are respectively provided with the helium gas switch (11) and the test gas switch (12).
2. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the upper side and the lower side of the test rock test piece (3) are provided with gas dispersion sheets (21), the upper surface of the test rock test piece (3) is provided with a pressure head (22), the test rock test piece (3) is fixedly arranged on the lower seat (5) through the base (6), and the test rock test piece is sealed by adopting a rubber leather sleeve (24) and a metal hoop (23).
3. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the buffer gas tank (15) is used for providing pressure for porosity test, the upper end of the buffer gas tank (15) is connected with a test rock test piece (3) in the inner cavity of the fixed unit main body (2) through an upper gas inlet pipeline (16), and the lower end of the buffer gas tank (15) is connected with the test rock test piece (3) in the inner cavity of the fixed unit through a lower gas inlet pipeline (20).
4. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the helium storage tank (14) is used for providing helium for the buffer gas tank (15) and calibrating the pore volume of the rock, the helium storage tank (14) is communicated with the buffer gas tank (15) through the helium and test gas pipeline (10), and the helium switch (11) is arranged on the helium and test gas pipeline (10).
5. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the test gas storage tank (13) is used for providing test gas for the buffer gas tank (15), the test gas storage tank (13) is communicated with the buffer gas tank (15) through the helium and test gas pipeline (10), and the test gas switch (12) is arranged on the helium and test gas pipeline (10).
6. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the barometer (17) is used for measuring the pressure of gas, and the barometer (17) is used for testing the gas pressure of the buffer gas tank (15).
7. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the oil pump (8) is used for providing confining pressure for the inner cavity of the unit main body (2) of the fixed unit, and the oil pump (8) is provided with an oil pressure gauge for measuring confining pressure of the inner cavity of the unit main body (2) of the fixed unit.
8. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the gas switch is used for controlling the flow of gas in the pipeline, wherein an upper gas inlet switch (18) controls an upper gas inlet pipeline (16) of the fixed unit, a lower gas inlet switch (19) controls a lower gas inlet pipeline (20) of the fixed unit, and the helium switch (11) and the test gas switch (12) respectively control a helium gas storage tank (14) and a test gas storage tank (13) to be gas pipelines for filling gas into the buffer gas tank (15).
9. A test instrument for rock gas high pressure adsorption according to claim 1, wherein: the diameter of the test rock test piece (3) is 50cm, and the height of the test rock test piece is 20-100 mm.
10. A test method of a test instrument for rock gas high-pressure adsorption is characterized in that: at a certain fixed temperature T 1, the porosity of the rock test piece (3) is tested by the following steps:
(1) And testing the diameter D and the height H of the rock test piece (3) by adopting a vernier caliper, and calculating the volume V S of the test piece:
(2) The method comprises the steps of installing a fixing unit, connecting a gas pipeline, installing a cylindrical steel test piece with the same volume as a rock test piece (3), determining that all switches are closed, and opening a constant temperature system (9) to set a fixed temperature T 1;
(3) Opening a valve of a manual oil pump (8) to provide confining pressure Pv in a unit main body (2) of the fixed unit;
(4) Opening a helium switch (11) to charge helium gas into a buffer gas tank (15) and provide pressure; closing a helium switch (11), and recording the reading of a barometer (17) as pressure P 1 after the gas pressure is stable;
(5) Opening a lower air inlet switch (19) and an upper air inlet switch (18), and recording the display pressure P 2 of the barometer (17) after the air pressure is stable; according to an ideal gas equation, the equivalent volume V 2 of a sealing pipeline of the lower air inlet switch (19) and the upper air inlet switch (18) and the gas dispersion sheet (21) is calculated as follows:
(6) Closing a lower air inlet switch (19), closing and dismantling the manual oil pump (8), disassembling the fixing unit, taking out a cylindrical steel test piece, installing a test rock test piece (3) in a unit main body (2) of the fixing unit, and connecting a gas pipeline;
(7) Installing and opening a manual oil pump (8), providing confining pressure oil for the fixing unit, and applying confining pressure Pv;
(8) The helium switch (11) is turned on to provide pressure for the buffer gas tank (15), the helium switch (11) is turned off, and after the gas pressure is stable, the reading of the barometer (17) is recorded as pressure P 1;
(9) After the lower air inlet switch (19) and the upper air inlet switch (18) are opened and 6 hours later, the display reading of the barometer (17) is recorded as pressure P 3, and according to an ideal gas equation, the pore volume V 3 of the test rock test piece (3) is calculated according to the following formula:
(11) Closing and removing the lower air inlet switch (19) and the upper air inlet switch (18), releasing helium gas in the buffer gas tank (15) and the connected gas pipeline, and reconnecting the lower air inlet switch (19) and the upper air inlet switch (18) after 4 hours;
(12) Opening a test gas switch (12) to charge test gas into a buffer gas tank (15) and provide pressure; closing a helium switch (11), and recording the pressure P 1 of a barometer (17) after the gas pressure is stable;
(13) After the lower air inlet switch (19) and the upper air inlet switch (18) are opened and 6 hours later, the display pressure P 4 of the barometer (17) is recorded, and the pore volume V 4 of the test rock test piece (3) is calculated according to an ideal gas equation as follows:
(14) The adsorption quantity n of the test gas in unit volume of the test rock test piece (3) is as follows under the conditions of the temperature T 1, the confining pressure Pv and the gas pressure P 4:
The operation step (14) tests the adsorption quantity n of the rock sample per unit volume under the action of fixed temperature, confining pressure and gas pressure, wherein R is an ideal gas constant, 8.314J/mol.K, T is the absolute temperature of ideal gas, the unit is K, and the volume V S of the sample; therefore, the adsorption quantity n of the unit volume of the rock test piece (3) is tested by changing parameters such as the temperature, the confining pressure, the gas pressure and the like of the constant temperature system (9), and the change rule of the adsorption quantity n is obtained.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910014113 | 2019-01-08 | ||
| CN201910014113X | 2019-01-08 |
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| CN109959578B true CN109959578B (en) | 2024-04-30 |
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