CN109459371B - Rock material gas permeability testing device and testing method thereof - Google Patents
Rock material gas permeability testing device and testing method thereof Download PDFInfo
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- CN109459371B CN109459371B CN201811588511.4A CN201811588511A CN109459371B CN 109459371 B CN109459371 B CN 109459371B CN 201811588511 A CN201811588511 A CN 201811588511A CN 109459371 B CN109459371 B CN 109459371B
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- 238000012360 testing method Methods 0.000 title claims abstract description 79
- 239000011435 rock Substances 0.000 title claims abstract description 45
- 230000035699 permeability Effects 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 229920006335 epoxy glue Polymers 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000012512 characterization method Methods 0.000 abstract description 2
- 229920006334 epoxy coating Polymers 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- 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
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fluid Mechanics (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the technical field of rock material characterization, and particularly relates to a rock material gas permeability testing device and a testing method thereof, wherein the testing method comprises the following steps: epoxy glue coating, rubber sealing plug, metal air guide head, valve, rubber pipe and manual vacuum pump; a measuring hole is formed in the testing surface of the rock sample or the rock wall of the chamber, one end of the rubber sealing plug is arranged in the measuring hole, the other end of the rubber sealing plug is connected with one end of a metal air guide head, and the other end of the metal air guide head is connected with a manual vacuum air pump through a rubber pipe; the rubber tube is provided with a valve; the test surface of the rock sample or chamber wall is also coated with an epoxy coating.
Description
Technical Field
The invention belongs to the technical field of rock material characterization, and particularly relates to a rock material gas permeability testing device and a testing method thereof.
Background
In the energy engineering fields of shale gas exploitation, underground gas storage development, radioactive waste disposal warehouse development and the like, the gas permeability of materials such as chamber surrounding rock and the like is a core parameter necessary for exploitation efficiency prediction, tightness evaluation and safety evaluation. However, current indoor testing methods of gas permeability generally require the application of confining pressure using a triaxial test system to ensure sealing conditions during the test; a gas pressurization system is also required to create a pressure differential across the sample. The method has long test time requirement, complex test conditions and can not realize field measurement. At present, the permeability test method adopted in the engineering site is mainly a water pressure test method, and has huge cost and lower test efficiency. Therefore, the research and development of the testing device and the testing method for the gas permeability of the rock material, which are simple, efficient and convenient for field application, are requirements for the field rapid evaluation of the material performance, and have important significance for the energy engineering.
Disclosure of Invention
The invention aims to provide a rock material gas permeability testing device and a testing method thereof, which solve the problems of low gas permeability indoor test efficiency, high cost and difficulty in realizing engineering field test.
The technical scheme adopted by the invention is as follows:
a rock material gas permeability testing device, comprising: epoxy glue coating, rubber sealing plug, metal air guide head, valve, rubber pipe and manual vacuum pump; a measuring hole is formed in the test surface of the rock sample, one end of the rubber sealing plug is arranged in the measuring hole, the other end of the rubber sealing plug is connected with one end of a metal air guide head, and the other end of the metal air guide head is connected with a manual vacuum air pump through a rubber pipe; the rubber tube is provided with a valve; the test surface of the rock specimen was also coated with an epoxy glue coating.
The manual vacuum air pump is also provided with a barometer; the rubber sealing plug is integrally cylindrical, a blind hole is formed in the center of a connecting surface of the rubber sealing plug and the metal air guide head, the diameter of the inner wall of the middle section of the blind hole is larger than that of the inner walls of the upper end and the lower end of the blind hole, and the diameter of the inner wall of the upper end and the inner wall of the lower end of the blind hole are smaller than the outer diameter of the metal air guide head.
Measuring the diameter of the hole as described above to be 1cm and the depth to be 5cm;
as mentioned above, the outer diameter of the middle section of the metal air guide head is larger than that of the upper and lower ends of the metal air guide head.
The testing method of the rock material gas permeability testing device comprises the following steps:
step one: drilling a test hole;
step two: assembling the testing device;
step three: establishing a negative pressure environment of the testing device;
step four: recording a pressure recovery process;
step five: the permeability was calculated.
Step one as described above: drilling test holes, comprising: a cylindrical measuring hole with the diameter of 1cm and the depth of 5cm is drilled on a rock sample or a rock wall of a chamber by using a hand-held electric drill.
Step two as described above: the assembly test device further comprises: the contact surface of the rubber sealing plug and the rock sample or the rock wall of the chamber is fully coated with quick-drying epoxy glue, the rubber sealing plug is plugged into the measuring hole, and the sealing is realized by full compaction; the metal air guide head is plugged into the central hole of the rubber sealing plug, so that sealing is ensured; the metal air guide head is connected with the manual vacuum air pump through a rubber pipe, and a valve is arranged on the rubber pipe; the manual vacuum pump is equipped with a barometer that can display the internal pressure in real time, and the stopwatch is zeroed for recording the test time.
The third step, establishing a negative pressure environment of the testing device, further comprises: pumping by using a manual vacuum pump until the display value of the barometer reaches the set minimum air pressure P min ，P min Atmospheric pressure P with value less than 0.5 times atm The method comprises the steps of carrying out a first treatment on the surface of the Stopping pumping, closing the valve, and starting the stopwatch to record the time.
Step four as described above: recording a pressure recovery process, comprising: and recording readings P of barometers at different moments t in the pressure recovery process, and obtaining the Pv.s.t data.
Step five as described above: calculating the permeability includes: according to the least square method principle, the data of Pv.s.t obtained in the fourth step are solved and fitted by utilizing the circular hole radiation flow theory, and the gas permeability K can be finally determined; the theoretical solution of the circular hole radiation flow is as follows:
wherein P is the barometer reading at time t, and the unit is Pa; p (P) atm Atmospheric pressure, unit Pa, at room temperature 10 5 Pa；P min For reading of barometer when closing valve, unit is Pa, P min Atmospheric pressure P with value less than 0.5 times atm ；t-t 0 For a stopwatch reading corresponding to the air pressure P; mu is the dynamic viscosity coefficient of air, the unit is Pa.s, and the unit is 1.9X10 at room temperature -5 Pa·s；D hole And D cover The diameters of the measuring hole and the rubber sealing plug are respectively m and D cover /D hole >10。
The beneficial effects of the invention are as follows:
according to the testing device and the testing method for the gas permeability of the rock material, a cylindrical testing hole is drilled in a rock sample or a chamber wall, and a negative pressure environment is formed in the testing hole by utilizing vacuum pumping equipment; after stopping the air extraction, recording the pore pressure recovery process; and (5) fitting the test result by using a circular hole radiation flow theoretical solution to obtain the gas permeability of the rock sample or the chamber wall. The method has the advantages of simple testing process and high efficiency, and can solve the problems of low indoor test efficiency of gas permeability, high cost and difficulty in realizing engineering field test.
Drawings
FIG. 1 is a schematic diagram of a rock material gas permeability testing device according to the present invention;
FIG. 2 is a schematic diagram showing the process of the air pressure change of a test hole of a rock material air permeability test device according to the present invention;
fig. 3 is a schematic diagram of dimensions of a test hole and a circular rubber sealing plug of a rock material gas permeability test device according to the present invention.
Wherein: the device comprises a rock sample 1, a measuring hole 2, an epoxy glue coating 3, a rubber sealing plug 4, a metal air guide head 5, a valve 6, a rubber tube 7, a barometer 8 and a manual vacuum air pump 9.
Detailed Description
A rock material gas permeability testing device, comprising: the device comprises an epoxy glue coating 3, a rubber sealing plug 4, a metal air guide head 5, a valve 6, a rubber tube 7 and a manual vacuum air pump 9; a measuring hole 2 is formed in the testing surface of the rock sample 1, one end of the rubber sealing plug 4 is arranged in the measuring hole 2, the other end of the rubber sealing plug 4 is connected with one end of a metal air guide head 5, and the other end of the metal air guide head 5 is connected with a manual vacuum air pump 9 through a rubber pipe 7; the rubber tube 7 is provided with a valve 6; the test surface of the rock specimen 1 is also coated with an epoxy glue coating 3.
The rock material gas permeability testing device can also be installed on the wall of the chamber.
The manual vacuum air pump 9 is also provided with a barometer 8; the rubber sealing plug 4 is integrally cylindrical, a blind hole is formed in the center of a connecting surface of the rubber sealing plug 4 and the metal air guide head 5, the diameter of the inner wall of the middle section of the blind hole is larger than that of the inner walls of the upper end and the lower end of the blind hole, and the diameter of the inner walls of the upper end and the lower end of the blind hole is smaller than the outer diameter of the metal air guide head 5.
The diameter of the measuring hole 2 is 1cm, and the depth is 5cm.
The outer diameter of the middle section of the metal air guide head 5 is larger than that of the upper end and the lower end of the metal air guide head 5.
The testing method of the rock material gas permeability testing device comprises the following steps:
step one: drilling a test hole;
step two: assembling the testing device;
step three: establishing a negative pressure environment of the testing device;
step four: recording a pressure recovery process;
step five: the permeability was calculated.
The first step is as follows: drilling test holes, comprising: a cylindrical measuring hole 2 with a diameter of 1cm and a depth of 5cm is drilled in the rock sample 1 or the rock wall of the chamber by using a hand-held electric drill.
The second step is as follows: the assembly test device further comprises: the contact surface of the rubber sealing plug 4 and the rock sample 1 or the rock wall of the chamber is coated with quick-drying epoxy glue 3, the rubber sealing plug 4 is plugged into the measuring hole 2, and the sealing is realized by full compaction; the metal air guide head 5 is plugged into the central hole of the rubber sealing plug 4, so that sealing is ensured; the metal air guide head 5 is connected with the manual vacuum air pump 9 through a rubber pipe 7, and a valve 6 is arranged on the rubber pipe 7; the manual vacuum pump 9 is equipped with a barometer 8 that can display the internal pressure in real time, and the stopwatch is zeroed for recording the test time.
Step three, establish the testing arrangement negative pressure environment, still include: pumping is carried out by using a manual vacuum pump 9 until the display value of the barometer 8 reaches the set minimum air pressure P min ，P min Atmospheric pressure P with value less than 0.5 times atm The method comprises the steps of carrying out a first treatment on the surface of the Stopping pumping, closing the valve, and starting the stopwatch to record the time.
And step four: recording a pressure recovery process, comprising: and recording readings P of the barometer 8 at different moments t in the pressure recovery process, and obtaining the Pv.s.t data.
The fifth step is as follows: calculating the permeability includes: according to the least square method principle, the data of Pv.s.t obtained in the fourth step are solved and fitted by utilizing the circular hole radiation flow theory, and the gas permeability K can be finally determined; the theoretical solution of the circular hole radiation flow is as follows:
wherein P is the reading of the barometer 8 at the time t, and the unit is Pa; p (P) atm Atmospheric pressure, unit Pa, at room temperature 10 5 Pa；P min For reading of barometer 8 when closing the valve, in Pa, P min Atmospheric pressure P with value less than 0.5 times atm ；t-t 0 For a stopwatch reading corresponding to the air pressure P; mu is the dynamic viscosity coefficient of air, the unit is Pa.s, and the unit is 1.9X10 at room temperature -5 Pa·s；D hole And D cover The diameters of the measuring hole 2 and the rubber sealing plug 4 are respectively m and D cover /D hole >10。
The present invention has been described in detail with reference to the drawings and the embodiments, which are a preferred embodiment of the present invention, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The invention may be practiced otherwise than as specifically described.
Claims (3)
1. A testing method of a rock material gas permeability testing device is characterized by comprising the following steps: the rock material gas permeability testing device includes: the device comprises an epoxy glue coating (3), a rubber sealing plug (4), a metal air guide head (5), a valve (6), a rubber pipe (7) and a manual vacuum air pump (9); a measuring hole (2) is formed in the testing surface of the rock sample (1), one end of the rubber sealing plug (4) is arranged in the measuring hole (2), one end of the metal air guide head (5) is connected with the other end of the rubber sealing plug (4), and the other end of the metal air guide head (5) is connected with the manual vacuum air pump (9) through a rubber pipe (7); a valve (6) is arranged on the rubber tube (7); the test surface of the rock sample (1) is also coated with an epoxy glue coating (3);
the manual vacuum air pump (9) is also provided with a barometer (8); the rubber sealing plug (4) is integrally cylindrical, a blind hole is formed in the center of a connecting surface of the rubber sealing plug (4) and the metal air guide head (5), the diameter of the inner wall of the middle section of the blind hole is larger than that of the inner walls of the upper end and the lower end of the blind hole, and the diameters of the inner walls of the upper end and the lower end of the blind hole are smaller than the outer diameter of the metal air guide head (5);
the diameter of the measuring hole (2) is 1cm, and the depth is 5cm;
the outer diameter of the middle section of the metal air guide head (5) is larger than that of the upper end and the lower end of the metal air guide head (5);
the testing method of the rock material gas permeability testing device comprises the following steps:
step one: drilling a test hole;
step two: assembling the testing device;
step three: establishing a negative pressure environment of the testing device;
step four: recording a pressure recovery process;
step five: calculating the permeability;
step three, establish the testing arrangement negative pressure environment, still include: pumping by using a manual vacuum pump (9) until the display value of the barometer (8) reaches the set minimum air pressure P min ，P min Atmospheric pressure P with value less than 0.5 times atm The method comprises the steps of carrying out a first treatment on the surface of the Stopping air extraction, closing a valve, and starting a stopwatch to record time;
and step four: recording a pressure recovery process, comprising: recording readings P of barometers (8) at different moments t in the pressure recovery process, and obtaining Pv.s.t data;
the fifth step is as follows: calculating the permeability includes: according to the least square method principle, the Pv.s.t data obtained in the fourth step are fitted by utilizing the circular hole radiation flow theory solution, and the gas permeability K can be finally determined; the theoretical solution of the circular hole radiation flow is as follows:
wherein P is the reading of a barometer (8) at the time t, and the unit is Pa; p (P) atm Atmospheric pressure, unit Pa, at room temperature 10 5 Pa；P min For reading of barometer (8) when closing valve, in Pa, P min Atmospheric pressure P with value less than 0.5 times atm ；t-t 0 For a stopwatch reading corresponding to the air pressure P; mu is the dynamic viscosity coefficient of air, the unit is Pa.s, and the unit is 1.9X10 at room temperature -5 Pa·s；D hole And D cover The diameters of the measuring hole (2) and the rubber sealing plug (4) are respectively m and D cover /D hole >10。
2. The method for testing a rock material gas permeability testing apparatus according to claim 1, wherein: the first step is as follows: drilling test holes, comprising: a cylindrical measuring hole (2) with the diameter of 1cm and the depth of 5cm is drilled on a rock sample (1) by using a hand-held electric drill.
3. The method for testing a rock material gas permeability testing apparatus according to claim 2, wherein: the second step is as follows: the assembly test device further comprises: the contact surface of the rubber sealing plug (4) and the rock sample (1) is coated with a quick-drying epoxy glue coating (3), the rubber sealing plug (4) is plugged into the measuring hole (2), and the sealing is realized by full compaction; the metal air guide head (5) is plugged into the central hole of the rubber sealing plug (4) to ensure sealing; the metal air guide head (5) is connected with the manual vacuum air pump (9) through a rubber pipe (7), and a valve (6) is arranged on the rubber pipe (7); the manual vacuum pump (9) is equipped with a barometer (8) that can display the internal pressure in real time, and the stopwatch is zeroed for recording the test time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811588511.4A CN109459371B (en) | 2018-12-25 | 2018-12-25 | Rock material gas permeability testing device and testing method thereof |
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| CN201811588511.4A CN109459371B (en) | 2018-12-25 | 2018-12-25 | Rock material gas permeability testing device and testing method thereof |
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| CN113588515B (en) * | 2021-07-28 | 2023-07-18 | 清华大学 | Water seepage coefficient detection device and method |
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