CN109655391B - Rock-soil body material gas breakthrough/permeability characteristic double-module control test system - Google Patents
Rock-soil body material gas breakthrough/permeability characteristic double-module control test system Download PDFInfo
- Publication number
- CN109655391B CN109655391B CN201811376102.8A CN201811376102A CN109655391B CN 109655391 B CN109655391 B CN 109655391B CN 201811376102 A CN201811376102 A CN 201811376102A CN 109655391 B CN109655391 B CN 109655391B
- Authority
- CN
- China
- Prior art keywords
- pressure
- valve
- testing
- test
- rock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
A dual-module control test system for gas breakthrough/permeability characteristics of rock-soil mass materials comprises a gas source, a booster pump, a high-pressure cracking/breakthrough test module I, a low-pressure permeability test module II and a mass spectrometer, wherein the high-pressure cracking/breakthrough test module I comprises a valve A, a first steel cylinder, an upper exhaust pipeline, a valve C, a test meter M1, a valve E and a first pressure chamber which are sequentially connected, the low-pressure simulation branch comprises a pressure regulating valve, a valve B, a second steel cylinder, a lower exhaust pipeline, a valve D, a test meter M2, a valve F, a second pressure chamber and a lower end exhaust port which are sequentially connected, pressure and temperature modules are arranged in the M1, the M2 and the M3 and are respectively connected with a first computer and a second computer, and an air source is connected with a booster pump, then divided into a first testing module and a second testing module and finally connected to a mass spectrometer. The invention can accurately test the gas breakthrough characteristic or gas permeability characteristic of the rock-soil body material and the barrier/adsorption characteristic of the rock-soil body material to different fluids under the condition.
Description
Technical Field
The invention relates to a gas permeation test device of a rock-soil body, in particular to a gas breakthrough/permeation characteristic dual-module control test system of a rock-soil body material.
Background
The fluid migration problem exists in the fields of geotechnical engineering, shale gas exploitation, nuclear waste deep-buried geological storage, carbon dioxide geological storage and the like. In the case of nuclear waste disposal, but not limited thereto, the storage reservoir generates a large amount of gas during long-term evolution, and therefore, how to evaluate and test the air tightness between the buffer material (such as bentonite) and the surrounding rock is a very important issue.
The current common research method is to obtain rock-soil body samples on the actual engineering site, simulate the actual conditions and environment on the site in a laboratory, and then obtain related gas permeation/breakthrough experimental data to guide the engineering practice.
There are two different concepts to be introduced here: (1) high gas pressure cracking/breakthrough; (2) the low pressure slowly permeates. Similarly, for example, the nuclear waste deep-buried geological storage is adopted, and as time evolves, the complex physical and chemical reaction gas will be gradually generated in the disposal warehouse, mainly hydrogen, methane and the like generated by corrosion of the disposal tank. As the gas is continuously generated, the gas pressure in the disposal container will gradually increase, the accumulated gas will escape to the outside through the buffer material, and the accumulated gas pressure will have a great influence on the stability and safety of the entire disposal container. In the process that the bentonite absorbs water and gas migrates outwards through the bentonite, the gas permeability characteristic of the rock-soil body material is an important index for evaluating the gas tightness of the rock-soil body material, and the tightness and the safety of the whole high-level nuclear waste disposal warehouse are related.
When gas is initially generated, the gas pressure is low, and the problem of slow permeation of low gas pressure is solved. Gas slowly diffuses and permeates through micron-sized pores in the rock-soil body material, and engineering practice can be guided by measuring the gas permeability of the rock-soil body material.
Along with the increasing internal air pressure, the high air pressure can damage the pore structure in the rock-soil body material and even cause the expansion of microcracks. When a certain air pressure value is reached, the rock-soil body material can form a through air flow channel, so that the rock body is cracked, and the gas breaks through the rock-soil body material and escapes quickly.
Different rock-soil body materials have different gas blocking capacities, and some rock-soil body materials have gas adsorption capacity, for example, coal bodies can adsorb a large amount of methane, which is a point that the adsorption capacity cannot be ignored. Some rock-soil body materials can significantly change the mechanical properties and the internal pore structure under the influence of underground water, for example, the buffer barrier material bentonite for nuclear waste disposal can absorb a large amount of underground water, and can expand after absorbing water, thereby significantly improving the air tightness of the materials.
The above examples show that different rock-soil body materials have different and complicated gas permeability characteristics under different air pressures and different environmental factors, and need to be tested according to actual conditions.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a gas breakthrough/permeability characteristic double-module control test system for a rock-soil body material, which can effectively simulate the environment and mechanical conditions under various geological conditions, and accurately test the gas breakthrough characteristic or gas permeability characteristic of the rock-soil body material under the conditions so as to guide the engineering practice.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high-pressure cracking/breakthrough testing module comprises a valve A, a first steel cylinder, an upper exhaust pipeline, a valve C, a testing meter M1, a valve E, a first pressure chamber, a testing meter M3 and an upper tail end exhaust port which are sequentially connected, a low-pressure simulation branch comprises a pressure regulating valve, a valve B, a second steel cylinder, a lower exhaust pipeline, a valve D, a testing meter M2, a valve F, a second pressure chamber and a lower tail end exhaust port which are sequentially connected, pressure and temperature modules for testing the pressure and temperature change of fluid are arranged in the testing meter M1, the testing meter M2 and the testing meter M3, the testing meter M1 and the testing meter M3 are respectively connected with the first computer, the testing meter M2 is connected with the second computer, the gas source is connected with a booster pump through a high-pressure pipe, the high-pressure pipe connected with the booster pump is divided into two paths, the upper path is a high-pressure cracking/breakthrough testing module, the lower path is a low-pressure penetration testing module, and the first pressure chamber and the second pressure chamber are connected to the mass spectrometer together.
Compared with the prior art, the rock-soil body material gas breakthrough/permeability characteristic dual-module control test system mainly comprises an upper test module and a lower test module: the high-pressure fracturing/breakthrough testing module on the upper road is used for testing the fracturing/breakthrough characteristics of the rock-soil body material under high air pressure, the low-pressure penetration testing module on the lower road is used for testing the slow penetration characteristics of the rock-soil body material under low air pressure, and finally the effective penetration rates of the rock-soil body material under the fracturing/breakthrough pressure of various rock-soil body materials under high air pressure and low air pressure can be accurately tested and obtained, and the adsorption and separation capacities of the rock-soil body material on different fluids can be judged for guiding the actual engineering practice.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view of the first pressure chamber/the second pressure chamber in the embodiment of the present invention.
Fig. 3(a) and 3(b) are the pressure change recorded by the outlet end measuring meter M3 of the first pressure chamber in the embodiment of the present invention, and the pressure change at the outlet end when the pressure at the inlet end reaches 10MPa, respectively.
Fig. 4 is a graph showing the pressure and temperature of the fluid according to the embodiment of the present invention, which is measured by the meter M2 at the inlet end of the second pressure chamber, as a function of time.
FIG. 5 is a graph of gas permeability as a function of time for an embodiment of the present invention.
In the figure, 1, a valve A, 2, a first steel cylinder, 3, an upper exhaust pipeline, 4, a valve E, 5, a first computer, 6, a valve C, 7, a lower exhaust pipeline, 8, a valve F, 9, a valve D, 10, a second steel cylinder, 11, a valve B, 12, a pressure regulating valve, 13, an upper tail end exhaust port, 14, a first pressure chamber, 15, a lower tail end exhaust port, 16, a second pressure chamber, 17, a second computer, 18, a pressure chamber main body, 19, a rock and soil body material to be measured, 20, a fluororubber sleeve, 21 and an oil pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Fig. 1 and 2 show schematic structural diagrams of a preferred embodiment of the invention, in which a dual-module control test system for gas breakthrough/permeability characteristics of rock-soil mass materials comprises a gas source, a booster pump, a high-pressure cracking/breakthrough test module (i), a low-pressure permeability test module (ii) and a mass spectrometer, the high-pressure cracking/breakthrough test module (i) comprises a valve a1, a first steel cylinder 2, an upper vent line 3, a valve C6, a test meter M1, a valve E4, a first pressure chamber 14, a test meter M3 and an upper tail end vent 13 which are connected in sequence, the low-pressure simulation branch comprises a pressure regulating valve 12, a valve B11, a second steel cylinder 10, a lower vent line 7, a valve D9, a test meter M2, a valve F8, a second pressure chamber 16 and a lower tail end vent 15 which are connected in sequence, a pressure and temperature module for testing pressure and temperature changes of fluid is arranged in each of the test meter M1, the test meter M2 and the test meter M3, the test meter M1 and the test meter M3 are respectively connected with the first computer 5, the test meter M2 is connected with the second computer 17, the gas source is connected with a booster pump through a high-pressure pipe, the high-pressure pipe connected with the booster pump is divided into two paths, the upper path is a high-pressure cracking/breaking test module I, the lower path is a low-pressure penetration test module II, and the first pressure chamber 14 and the second pressure chamber 16 are jointly connected with the mass spectrometer. The invention can effectively control the gas pressure, is used for different test requirements under high and low gas pressures, and has the advantages of simple operation, reasonable structural design and low manufacturing cost.
The first pressure chamber 14/the second pressure chamber 16 comprises a pressure chamber main body 18, a rock-soil body material 19 to be detected is wrapped by a fluororubber sleeve 20 and is hermetically placed in the pressure chamber main body 18, an oil pump 21 is communicated with the lower part of the pressure chamber main body 18, the upper part of the rock-soil body material 19 to be detected is connected with an upper tail end exhaust port 13 or a lower tail end exhaust port 15, and the lower part of the rock-soil body material to be detected is connected with an upper exhaust pipeline 3 or a lower exhaust pipeline 7.
The construction forming process of the system is as follows:
1. firstly, filling a single gas or mixed gas (taking bentonite as an example, mixed gas such as hydrogen, methane and the like is needed) which accords with field practice and needs simulation in an experiment as a gas source to simulate gas injection and supply gas for the experiment;
2. the high-pressure pipe connected with the gas source is connected with a booster pump, and the booster pump can increase the pressure of the gas provided by the gas source to a high-pressure state (determined according to the actual condition simulated by the experiment requirement);
3. then a high-pressure pipe communicated with the booster pump is divided into two paths:
(1) the upper path is directly connected to a high-pressure fracturing or breakthrough testing module (I) for simulating high-pressure fracturing or breakthrough, a valve A1 and a 300ml first steel cylinder 2 (the maximum pressure which can be borne by the inside of the steel cylinder is 35MPa) are connected next, a valve A1 in the middle of the pipeline is opened to balance the air pressure in the steel cylinder with the air pressure increased by a booster pump, the inside of the 300ml steel cylinder reaches high air pressure, and a valve A1 is closed, so that the high-pressure cylinder is used for simulating high-pressure fracturing (breakthrough) for standby;
(2) in the second low-pressure penetration testing module for simulating low-pressure slow penetration, before being connected to a 150ml second steel cylinder 10, the high pressure generated by the booster pump is reduced through a pressure regulating valve 12, so that the high pressure meets the simulation requirement of the low-pressure test; then opening a valve B11 between 150ml second steel cylinders 10 connected with low pressure to balance the internal pressure, closing a valve B11, and using the low pressure steel cylinder as a simulated low pressure permeation simulation for standby;
4. the upper and lower test modules (high pressure cracking/breakthrough test module (r) and low pressure penetration test module (r)) are connected to the respective cylinders (first cylinder 2 and second cylinder 10) and then connected to an exhaust port (upper exhaust line 3 and lower exhaust line 7, respectively) and a test meter (test meter M1 and test meter M2, respectively) which can measure the pressure and temperature of the fluid in the lines passing through the test meter, and then connected to the respective computers (i.e., first computer 5 and second computer 17) and can transmit the measurement results to the computers in real time and record the results. A valve (valve C6 and valve D9) is provided between the cylinder and the test meter to control the pressure actually needed to simulate the gas injection, and the pressure of the cylinder is usually slightly greater than the pressure needed for simulation.
Wherein, we set a valve (valve C6 and valve D9) between the cylinders (first cylinder 2 and second cylinder 10) and the tester (tester M1 and tester M2) to control the pressure of the gas injection actually needed to be simulated, and the pressure of the cylinder is usually slightly larger than the pressure needed for simulation.
In addition, meter M1 differs from meter M2 in that meter M1 is less accurate than meter M2, while meter M2 requires sufficient accuracy to record the pressure changes of the simulated slow low pressure permeation process. The accuracy grade of the pressure test meter is expressed by percentage of allowable error in the range of the pressure test meter, and the accuracy is lower when the range is larger. This is also the difference between the upper and lower module meters M, and is used to deal with the situation of different air pressure simulation.
5. Both test modules are then connected to two identically constructed pressure chambers (first pressure chamber 14 and second pressure chamber 16), respectively. Firstly, a rock-soil body material 19 to be measured is placed into a pressure chamber, the pressure chamber is wrapped and sealed by a fluororubber sleeve 20, then an oil pump 21 is used for pressurizing the pressure chamber to simulate the mechanical conditions of the rock-soil body material, the highest pressure of oil pressure can be increased to 60MPa, and the situation is equivalent to the situation of deep geological pressure of thousands of meters underground.
6. First, the high pressure cracking/breakthrough testing module of the above section, a measuring meter M3 and a mass spectrometer are connected behind the first pressure chamber 14, and the mass spectrometer is mainly used for detecting gas components and analyzing the components of the gas at the outlet end. Different rock-soil body materials have different adsorption or barrier capabilities to different gases, for example, a coal sample can adsorb a large amount of methane gas, a bentonite material can absorb a large amount of water, and the like. Through the analysis of the mass spectrometer, the change of gas components in the mixed gas passing through the rock-soil body material can be judged, and then the blocking or adsorption capacity of the rock-soil body material to different gases under the simulated condition can be judged.
When the high-pressure cracking/breakthrough testing module is actually used, firstly, (1) the pressure at the inlet end of the first pressure chamber 14 is gradually increased according to gradients (generally 1 and 2 … 15MPa), and each pressure gradient lasts for 3-7 days (the specific time is determined according to the pressure evolution condition at the outlet end of the pressure gradient); (2) when the outlet end pressure suddenly increases significantly to a large extent, it can be considered that the gas has broken through or fractured the sample of the rock-soil mass material. In particular, the following bentonite material test cases can be seen: as shown in fig. 3(a), the pressure change recorded by the meter M3 at the outlet end of the first pressure chamber 14 is shown, the pressure at the inlet end of the first pressure chamber 14 is 1Mpa at the beginning, the bentonite material is slowly permeated, the pressure at the outlet end is also slowly increased, and after lasting for 3-7 days, the pressure is still slowly increased, i.e. the rock-soil body material cannot be cracked/broken through at the air pressure. The pressure at the inlet end is then increased in a gradient and the process is repeated. When the pressure at the inlet end reaches 10MPa, it still slowly increases for the first few days, but at some point, the pressure at the outlet end suddenly increases greatly, as shown in fig. 3 (b). At this time, it is considered that the high pressure of 10MPa causes cracking and breaks through the rock-soil body material. In engineering practice, the maximum pressure which the rock-soil mass material can bear is about 10MPa, and large-scale gas leakage is easy to occur when the maximum pressure exceeds the maximum pressure.
7. And a low-pressure penetration testing module on the lower part is connected to the same mass spectrometer only after the second pressure chamber 16 and is used for analyzing gas components at the outlet end. During the low pressure slow permeation test, the meter M2 at the inlet of the second pressure chamber 16 records the change of the fluid pressure and temperature, and plots the change of the air pressure and temperature with time, as shown in fig. 4.
8. And finally, after the simulation experiment is finished, releasing redundant gas through the upper exhaust pipeline 3 and the lower exhaust pipeline 7, so that the air pressure in the system pipeline is reduced to reach a safe level. Meanwhile, when the air pressure in the pipeline is too high, the air pressure can be reduced to the required air pressure level through the exhaust pipeline.
The whole system operation steps and the calculation principle are as follows:
during measurement, a sample is placed in the first pressure chamber 14 or the second pressure chamber 16, then the valve A1 or the valve B11 between the gas source and the first steel cylinder 2 or the second steel cylinder 10 is always opened, meanwhile, the valve C6 between the first steel cylinder 2 and the test meter M1 and the valve D9 between the second steel cylinder 10 and the test meter M2 are also opened, a certain pressure P1 is injected into the first steel cylinder 2 or the second steel cylinder 10, the value can be read by the test meter M1 or the test meter M2, and then the valve C6 or the valve D9 is closed; then the valve E4 between the first pressure chamber 14 and the first steel cylinder 2 or the valve F8 between the second pressure chamber 16 and the second steel cylinder 10 is opened to start gas injection into the sample, the pressure change in the process can be read from the test meter M2, after the time of delta t, the test meter M2 degrees changes to P1-delta P, and the average pressure in the first steel cylinder 2 or the second steel cylinder 10 is equal to the average pressure in the delta t time
Wherein: p1The pressure at which the steel cylinder is initially filled is called initial pressure; the delta P is a pressure value which changes within delta t time after the valve is opened to inject gas into the sample; Δ t is the time of change; pmeanIs the average pressure;
according to Darcy's law, the average flow rate passing in the time period can be known as
Wherein: k is the permeability, A is the cross-sectional area of the fluid, μ is the kinematic viscosity,
is a partial derivative to the air pressure; qmean is the average flow;
according to the ideal gas state equation, have
ΔPV0＝PmeanQmeanΔt (3)
Namely, it is
Wherein, V0Is the volume of the first cylinder 2 or the second cylinder 10.
The distribution of the compressible gas in the sample obeys the following function:
wherein h is the height of the sample, t is the time, and x is the flowing distance of the gas in the sample after the gas injection;
the derivation of equation (5) is:
when measuring the gas permeability at the inlet end of the sample, i.e. the gas entry permeability, then x is taken to be 0, with
Wherein: p0Is one atmosphere, the remaining symbols are the same as defined previously;
with the formula (2) of
The effective permeability of the gas at the inlet end can be obtained by combining the formula (8) and the formula (4)
Wherein all symbols are as defined above;
that is, with the height and cross-sectional area of the sample known, the effective permeability k of the sample can be obtained by measuring the inlet end pressure change Δ P over the inlet end Δ t, see fig. 5.
Because the pipelines of the system are assembled, the whole system can be flexibly modified to adapt to special test requirements. Two test requirements and modification modes (modification is mainly a pressure chamber connection mode, and does not relate to the previous dual-module test control system) are briefly described as follows:
(1) gas transient method
One of the commonly used methods for testing the permeability of rock-soil mass materials. The developed test system can meet the test requirement of the gas transient method only by slightly modifying, and the specific structure modification process is that only the pressure chamber of any one test module needs to be detached, then the pipeline at the outlet end of the pressure chamber of the other test module is disconnected, and then the outlet end of the pressure chamber is connected with the pipeline of the detached test module.
(2) Test for low-pressure permeability and high-pressure breakthrough consistency characteristics of rock-soil mass material
Sometimes, for a rock-soil mass material, we need to know the permeability of the rock-soil mass material when slowly permeating from low air pressure, and gradually increase according to a gradient until the rock-soil mass material cracks and breaks through the change of the permeability and the value of the breakthrough pressure in the whole stage. During such testing, both test modules are needed and the air tightness cannot be affected during the process, i.e. the system cannot be disassembled and temporarily modified during the testing. Therefore, the connection mode of the pipeline needs to be modified in advance, namely the pressure chamber of the testing module II is removed from the pressure chamber which is merged into the testing module I, and the valves in front of the two pressure chambers are combined into one. When the gas injection test is performed, the test module is used for performing the test. After the low-pressure test stage is completed, the air pressure in the first test module is adjusted to be the same as that in the second test module, and then the valve in the second test module is closed. Thus, the two modules are connected together seamlessly, and then the high-voltage testing module (i) is used for testing continuously.
The above two test requirements are test methods very common in the field of geotechnical engineering test, and generally, each test requirement requires a specific test system. The system developed by the people can meet the two testing requirements through simple pipeline modification, and the strong innovativeness and adaptability of the system developed by the people are reflected. A large amount of manpower, material resources and financial resources can be saved, and the same test functions of several test systems can be achieved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are included in the protection scope of the present invention.
Claims (3)
1. A rock-soil body material gas breakthrough/permeability characteristic double-module control test system is characterized in that: the high-pressure cracking/breakthrough testing module comprises a valve A (1), a first steel cylinder (2), an upper exhaust pipeline (3), a valve C (6), a testing meter M1, a valve E (4), a first pressure chamber (14), a testing meter M3 and an upper tail end exhaust port (13) which are sequentially connected, a low-pressure simulation branch comprises a pressure regulating valve (12), a valve B (11), a second steel cylinder (10), a lower exhaust pipeline (7), a valve D (9), a testing meter M2, a valve F (8), a second pressure chamber (16) and a lower tail end exhaust port (15) which are sequentially connected, pressure and temperature modules for testing the pressure and temperature change of fluid are arranged in the testing meter M1, the testing meter M2 and the testing meter M3, the testing meter M1 and the testing meter M3 are respectively connected with a first computer (5), the test meter M2 is connected with a second computer (17), an air source is connected with a booster pump through a high-pressure pipe, the high-pressure pipe connected with the booster pump is divided into two paths, the upper path is a high-pressure cracking/breakthrough test module I, the lower path is a low-pressure penetration test module II, and a first pressure chamber (14) and a second pressure chamber (16) are connected to a mass spectrometer together;
the first pressure chamber (14)/the second pressure chamber (16) comprises a pressure chamber main body (18), a rock-soil body material (19) to be detected is wrapped by a fluororubber sleeve (20) and is hermetically placed in the pressure chamber main body (18), an oil pump (21) is communicated with the lower part of the pressure chamber main body (18), the upper part of the rock-soil body material (19) to be detected is connected with an upper tail end exhaust port (13) or a lower tail end exhaust port (15), and the lower part of the rock-soil body material to be detected is connected with an upper exhaust pipeline (3) or a lower exhaust pipeline (7);
the test method of the rock-soil body material gas breakthrough/permeability characteristic double-module control test system comprises the following steps:
during measurement, a sample is placed in the first pressure chamber (14) or the second pressure chamber (16), then a valve A (1) or a valve B (11) between a gas source and the first steel cylinder (2) or the second steel cylinder (10) is always opened, a valve C (6) between the first steel cylinder (2) and the test meter M1 and a valve D (9) between the second steel cylinder (10) and the test meter M2 are also opened, and a certain pressure P is injected into the first steel cylinder (2) or the second steel cylinder (10)1The value can be read by a test meter M1 or a test meter M2, after which the valve C (6) or D (9) is closed; the valve E (4) between the first pressure chamber (14) and the first cylinder (2) or the valve F (8) between the second pressure chamber (16) and the second cylinder (10) is opened again to start gas injection into the sample, the pressure change in the process can be read from the test meter M2, and after the time delta t, the test meter M2 degree is changed into P1Δ P, then the average pressure in the first cylinder 2 or the second cylinder 10 during the time Δ t is,
wherein, P1The pressure at which the steel cylinder is initially filled is called initial pressure; delta P is a pressure value which changes within delta t time after the valve is opened to inject gas into the sample; Δ t is the time of change; pmeanIs the average pressure;
the effective permeability of the finally obtained sample is,
wherein k is permeability, A is cross-sectional area of the fluid, μ is kinematic viscosity, and V0Is the volume of the first steel cylinder (2) or the second steel cylinder (10), h is the height of the sample, P0Is at atmospheric pressure;
the method for testing the low-pressure permeability and high-pressure breakthrough coherence characteristics of the rock-soil mass material by using the rock-soil mass material gas breakthrough/permeability characteristic dual-module control testing system comprises the following steps:
the method comprises the steps of removing a pressure chamber of a low-pressure penetration testing module II from the pressure chamber of a high-pressure cracking/breakthrough testing module I, combining valves in front of two pressure chambers into one, testing by using the low-pressure penetration testing module II when performing gas injection testing, adjusting the air pressure in the high-pressure cracking/breakthrough testing module I after completing a low-air pressure testing stage to enable the air pressure to be the same as that in the low-pressure penetration testing module II, closing the valves in the testing module II, and continuing to use the high-pressure cracking/breakthrough testing module I for testing.
2. The system for the dual-module control test of the gas breakthrough/permeability characteristics of the rock-soil mass material according to claim 1, wherein: the pressure measurement precision of the test meter M1 and the test meter M3 is smaller than that of the test meter M2.
3. The system for the dual-module control test of the gas breakthrough/permeability characteristics of the rock-soil mass material according to claim 1 or 2, which is characterized in that: the first steel cylinder (2) has a volume of 300ml and a pressure of 35MPa, and the second steel cylinder (10) has a volume of 150ml and a pressure of 35 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376102.8A CN109655391B (en) | 2018-11-19 | 2018-11-19 | Rock-soil body material gas breakthrough/permeability characteristic double-module control test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376102.8A CN109655391B (en) | 2018-11-19 | 2018-11-19 | Rock-soil body material gas breakthrough/permeability characteristic double-module control test system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109655391A CN109655391A (en) | 2019-04-19 |
| CN109655391B true CN109655391B (en) | 2022-01-11 |
Family
ID=66110961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811376102.8A Active CN109655391B (en) | 2018-11-19 | 2018-11-19 | Rock-soil body material gas breakthrough/permeability characteristic double-module control test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109655391B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579433B (en) * | 2019-09-30 | 2022-02-01 | 中国科学院力学研究所 | Method for obtaining two-stage permeability of particle sample |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311766A (en) * | 1992-07-07 | 1994-05-17 | The United States Of America As Represented By The United States Department Of Energy | Method and apparatus for determining two-phase flow in rock fracture |
| CN102147348A (en) * | 2011-01-25 | 2011-08-10 | 中国科学院山西煤炭化学研究所 | Device and method for measuring gas permeation in coal |
| CN102183448A (en) * | 2011-03-09 | 2011-09-14 | 中国科学院武汉岩土力学研究所 | Method and device for measuring breakthrough pressure of porous medium material |
| CN102297830A (en) * | 2011-05-20 | 2011-12-28 | 中国石油天然气股份有限公司 | Test system and method of fluid non-linear percolation characteristics in low-permeability porous media |
| CN103063557A (en) * | 2012-12-31 | 2013-04-24 | 河海大学 | Device and method for detecting gas permeability of rock |
| CN205383434U (en) * | 2016-03-01 | 2016-07-13 | 中国矿业大学 | Gas transfer control system |
-
2018
- 2018-11-19 CN CN201811376102.8A patent/CN109655391B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311766A (en) * | 1992-07-07 | 1994-05-17 | The United States Of America As Represented By The United States Department Of Energy | Method and apparatus for determining two-phase flow in rock fracture |
| CN102147348A (en) * | 2011-01-25 | 2011-08-10 | 中国科学院山西煤炭化学研究所 | Device and method for measuring gas permeation in coal |
| CN102183448A (en) * | 2011-03-09 | 2011-09-14 | 中国科学院武汉岩土力学研究所 | Method and device for measuring breakthrough pressure of porous medium material |
| CN102297830A (en) * | 2011-05-20 | 2011-12-28 | 中国石油天然气股份有限公司 | Test system and method of fluid non-linear percolation characteristics in low-permeability porous media |
| CN103063557A (en) * | 2012-12-31 | 2013-04-24 | 河海大学 | Device and method for detecting gas permeability of rock |
| CN205383434U (en) * | 2016-03-01 | 2016-07-13 | 中国矿业大学 | Gas transfer control system |
Non-Patent Citations (3)
| Title |
|---|
| Experimental research on water retention and gas permeability of compacted bentonite/sand mixtures;Jiang-Feng Liu 等;《Soils and Foundations》;20141023;第53卷(第5期);第1027-1038页 * |
| Research on gas migration properties in a saturated bentonite/sand mixture under flexible boundary conditions;Jiang-Feng Liu 等;《Soils and Foundations》;20180119;第58卷;第97-109页 * |
| 低渗透岩石渗透率与孔隙率演化规律的气渗试验研究;王环玲 等;《水利学报》;20150228;第46卷(第2期);第208-216页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109655391A (en) | 2019-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104502224B (en) | Saturation water Coal Under rock isothermal desorption curve determination device and method | |
| US8418526B2 (en) | System and method for testing gas migration process in coal-rock mass | |
| CN110296921B (en) | Testing device and testing method for shale gas permeability under reservoir conditions in steady state method | |
| US11530971B2 (en) | Device and method for measuring horizontal/vertical permeability of hydrate reservoir | |
| CN103063557B (en) | A kind of rock gas penetration test device and assay method | |
| CN109470617A (en) | A kind of quick experimental evaluation method of Fractured compact sandstone gas layer fluid speed | |
| CN103969165A (en) | Device and method for simultaneously testing permeability of compact rocks under transient state and steady state | |
| CN103163057A (en) | Testing device and measuring and calculating method for gas permeability of compact rock material | |
| CN103983533B (en) | A kind of gas bearing shale crack develops and seepage flow characteristics test device and method | |
| CN107288632B (en) | Coal-rock reservoir drainage and production water source and pressure drop path simulation device and method | |
| CN203630018U (en) | Unstable-state determination device for permeability of hyposmosis rock | |
| CN111272635A (en) | Rock porosity and permeability combined test device and test method under triaxial condition | |
| CN104034644B (en) | A kind of can the heterogeneous percolating medium triaxial stress seepage flow coupling test device of Quick Measurement porosity | |
| CN203929557U (en) | A kind of gas bearing shale crack develops and seepage flow characteristics proving installation | |
| CN106872329B (en) | Testing device and testing method for measuring liquid permeability of high permeability rock | |
| WO2011133885A1 (en) | Total storage capacity and total porosity of porous media | |
| KR101475831B1 (en) | Apparatus and method for measuring porosity of core sample from reservoir rock | |
| CN108709815B (en) | Experimental device and method for measuring fracture toughness of rock at low temperature | |
| CN108956854B (en) | Device for evaluating plugging performance of temporary plugging steering fluid and testing method thereof | |
| CN111272636A (en) | Device and method for measuring rock porosity under different kinds of stress | |
| CN112727444B (en) | Visual hole sealing material crack plugging performance testing device and method | |
| CN106814011A (en) | It is a kind of to determine the device and method that foam generates boundary in porous media | |
| Cui et al. | Investigation on gas migration in saturated bentonite using the residual capillary pressure technique with consideration of temperature | |
| Li et al. | Dynamic evolution of shale permeability under coupled temperature and effective stress conditions | |
| CN109655391B (en) | Rock-soil body material gas breakthrough/permeability characteristic double-module control test system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |