CN112611698A - Rock sample gas permeability testing device and testing method - Google Patents
Rock sample gas permeability testing device and testing method Download PDFInfo
- Publication number
- CN112611698A CN112611698A CN202011504401.2A CN202011504401A CN112611698A CN 112611698 A CN112611698 A CN 112611698A CN 202011504401 A CN202011504401 A CN 202011504401A CN 112611698 A CN112611698 A CN 112611698A
- Authority
- CN
- China
- Prior art keywords
- rock sample
- gas permeability
- pressure
- testing
- assembly
- 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.)
- Pending
Links
- 239000011435 rock Substances 0.000 title claims abstract description 134
- 230000035699 permeability Effects 0.000 title claims abstract description 59
- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 238000007789 sealing Methods 0.000 claims abstract description 76
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 238000010998 test method Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 21
- 230000005855 radiation Effects 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 238000012512 characterization method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 2
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the technical field of rock material characterization, and particularly relates to a rock sample gas permeability testing device and a rock sample gas permeability testing method. The test device includes: the sealing assembly is connected with the rock sample and used for sealing the rock sample; a pressurizing assembly engaged with the sealing assembly for applying pressure to the rock sample; the air exhaust assembly is connected with the sealing assembly and used for providing a negative pressure environment for the rock sample. The test method comprises the following steps: drilling a measuring hole of a rock sample; assembling a gas permeability testing device of the rock sample; establishing a negative pressure environment of a gas permeability testing device of a rock sample; recording the gas pressure recovery process in the measuring hole of the rock sample; the gas permeability of the rock sample is calculated. The testing device and the testing method can effectively solve the problems of low efficiency and complex operation of the gas permeability indoor test.
Description
Technical Field
The invention belongs to the technical field of rock material characterization, and particularly relates to a rock sample gas permeability testing device and a rock sample gas permeability testing method.
Background
In the energy engineering fields of shale gas exploitation, underground gas storage development, radioactive waste disposal reservoir research and development and the like, the gas permeability of the underground chamber surrounding rock material is a necessary core parameter for carrying out exploitation efficiency prediction, sealing evaluation and safety evaluation. However, current indoor testing methods of gas permeability typically require the use of a tri-axial testing system to apply confining pressure to achieve the sealing conditions required for the test; a gas pressurization system is also required to create a pressure differential in the sample. The test system is complex in structure and complex in operation, and high in safety protection requirement due to the fact that pressure containers such as a triaxial oil pressure cavity and an air bottle are required.
Therefore, the simple and efficient testing device and method for the gas permeability of the rock sample are needed for rapidly and accurately evaluating the material performance, and have important significance for the energy engineering.
Disclosure of Invention
The invention aims to provide a rock sample gas permeability testing device and a testing method, which can effectively solve the problems of low gas permeability indoor testing efficiency and complex sealing system.
The technical scheme for realizing the purpose of the invention is as follows: a rock sample gas permeability testing apparatus, the apparatus comprising: the sealing assembly is connected with the rock sample and used for sealing the rock sample; a pressurizing assembly engaged with the sealing assembly for applying pressure to the rock sample; the air exhaust assembly is connected with the sealing assembly and used for providing a negative pressure environment for the rock sample.
Further, the sealing assembly comprises an upper ram and a lower ram; the pressurizing assembly comprises an upper piston of the press machine, a lower piston of the press machine and the press machine; the air pumping assembly comprises a vacuum air pump; the lower surface of the upper pressure head is jointed with the upper surface of the rock sample, and the upper surface of the lower pressure head is jointed with the lower surface of the rock sample; the press machine is connected with an upper piston and a lower piston of the press machine, the lower surface of the upper piston of the press machine is jointed with the upper surface of the upper pressure head, and the upper surface of the lower piston of the press machine is jointed with the lower surface of the lower pressure head; the vacuum air pump is provided with a connecting pipe, and the free end of the connecting pipe is communicated with the other end of the vent hole.
Further, the seal assembly further comprises: the upper sealing gasket is arranged between the upper surface of the rock sample and the lower surface of the upper pressure head, and the lower sealing gasket is arranged between the lower surface of the rock sample and the upper surface of the lower pressure head.
Further, the air extraction assembly further comprises: the pressure gauge and the valve are sequentially arranged on the connecting pipe, and the valve is positioned between the pressure gauge and the vacuum air pump.
Furthermore, a measuring hole is formed in the central axis position of the rock sample and penetrates through the upper surface and the lower surface of the rock sample, an air vent is formed in the upper pressure head and penetrates through the right side face and the lower surface of the upper pressure head, and one end of the air vent is communicated with one end of the measuring hole.
Furthermore, a central hole is formed in the center of the upper sealing gasket and is communicated with the measuring hole and the vent hole in an aligned mode.
Furthermore, the upper sealing gasket and the lower sealing gasket are made of rubber materials.
Further, the upper sealing gasket and the lower sealing gasket are circular.
Further, the upper pressure head and the lower pressure head are cylindrical.
Further, the vent hole is L-shaped.
A method for testing gas permeability of a rock sample, the method comprising the steps of:
drilling a measuring hole of a rock sample;
step (2), assembling a gas permeability testing device of the rock sample;
step (3), establishing a negative pressure environment of the gas permeability testing device of the rock sample;
step (4), recording the gas pressure recovery process in the measuring hole of the rock sample;
and (5) calculating the gas permeability of the rock sample.
Further, the step (1) is specifically: and drilling a measuring hole along the central axis of the rock sample, wherein the measuring hole penetrates through the upper surface and the lower surface of the rock sample.
Further, the step (2) includes:
step (2.1), connecting the air extraction assembly and the sealing assembly;
step (2.2), installing a pressurizing assembly and a sealing assembly, enabling the sealing assembly to be jointed with the rock sample, and jointing the pressurizing assembly with the sealing assembly;
and (2.3) pressurizing the rock sample by using the pressurizing assembly, so that the sealing assembly can fully seal the upper surface and the lower surface of the rock sample.
Further, the step (2.1) is specifically: the vacuum air pump and the upper pressure head are connected through a connecting pipe.
Further, the step (2.2) is specifically: mounting a lower pressure head on a lower piston of a press; placing a lower seal gasket on the lower pressure head; placing a rock sample on a lower sealing pad; placing an upper sealing gasket on the upper surface of the rock sample, and aligning a central hole of the upper sealing gasket with a measuring hole of the rock sample; placing an upper pressure head on the upper sealing gasket, and aligning the vent hole of the upper pressure head with the central hole of the upper sealing gasket; and mounting the upper piston of the press on the upper press head.
Further, the step (2.3) is specifically: and starting the press machine, adjusting the positions of the upper piston and the lower piston of the press machine, and applying pressure to the rock sample, so that the upper sealing gasket and the lower sealing gasket can fully seal the upper surface and the lower surface of the rock sample.
Further, the step (3) is specifically: opening the valve, starting the vacuum air pump to pump air until the display value of the pressure gauge reaches the minimum air pressure PminClosing the valve and closing the vacuum air pump; at the same time recording this time as time t0。
Further, said PminIs less than 0.5 times the atmospheric pressure Patm。
Further, the step (4) is specifically as follows: and measuring the air pressure in the measuring hole through the pressure gauge, and recording the reading P of the pressure gauge at different moments t in the pressure recovery process to obtain P-t data.
Further, the step (5) is specifically: and (4) according to the least square principle, performing solution fitting on the P-t data obtained in the step (4) by using a circular hole radiation flow theory, and calculating to obtain the final gas permeability K.
Further, the formula of the theoretical solution of the circular hole radiation flow is as follows:
wherein the content of the first and second substances,
p is the air pressure in the process of recovering the air pressure in the rock sample measuring hole, and the unit is Pa;
Patmis atmospheric pressure in Pa;
Pminsetting the minimum air pressure in Pa;
t0for the pressure gauge reading to be at a minimum pressure PminThe unit of time corresponding to the time is s;
t is the corresponding moment when the reading of the pressure gauge is P, and the unit is s;
mu is the dynamic viscosity coefficient of air with the unit of Pa.s;
Dhand DsRespectively the diameter of the measuring hole and the rock sample, in m.
The invention has the beneficial technical effects that: the rock sample gas permeability testing device and the testing method provided by the invention have the advantages of simple structure, simple and convenient operation process and high efficiency, do not need a triaxial testing system to apply confining pressure, do not need a gas pressurization system, and can effectively solve the problems of low gas permeability indoor testing efficiency and complex sealing system.
Drawings
FIG. 1 is a schematic structural diagram of a rock sample gas permeability testing device provided by the invention;
FIG. 2 is a schematic diagram of a process of measuring the pressure change of a measuring hole measured by the rock sample gas permeability testing device provided by the invention;
fig. 3 is a schematic diagram of the positions of a rock sample and a measuring hole thereof of the rock sample gas permeability testing device provided by the invention.
In the figure:
1 is a rock sample, 2 is an upper sealing gasket, 3 is a lower sealing gasket, 4 is an upper pressure head, 5 is a lower pressure head, 6 is an upper piston of a press machine, 7 is a lower piston of the press machine, 8 is a measuring hole, 9 is a vent hole, 10 is a pressure gauge, 11 is a valve and 12 is a vacuum air pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in FIG. 1, the invention provides a rock sample gas permeability testing device, comprising: the sealing assembly is connected with the rock sample 1 and used for sealing the rock sample 1; a pressurizing assembly engaged with the sealing assembly for applying pressure to the rock specimen 1; the air pumping assembly is connected with the sealing assembly and is used for providing a pressure environment for the rock sample 1.
As shown in fig. 1, the sealing assembly includes: the device comprises an upper sealing gasket 2, a lower sealing gasket 3, an upper pressure head 4 and a lower pressure head 5; the pressurization subassembly includes: an upper piston 6 of the press machine, a lower piston 7 of the press machine and the press machine; the air extraction assembly comprises: a pressure gauge 10, a valve 11 and a vacuum pump 12.
As shown in fig. 1, the rock sample 1 is cylindrical, the lower surface of an upper pressure head 4 is jointed with the upper surface of the rock sample 1, and an upper sealing gasket 2 is arranged between the upper surface of the rock sample 1 and the lower surface of the upper pressure head 4; the upper surface of the lower pressure head 5 is jointed with the lower surface of the rock sample 1, and a lower sealing gasket 3 is arranged between the lower surface of the rock sample 1 and the upper surface of the lower pressure head 5; the upper pressure head 4 and the lower pressure head 5 are both cylindrical, and the upper sealing gasket 2 and the lower sealing gasket 3 are both circular rubber gaskets. A measuring hole 8 is formed in the central axis position of the rock sample 1, the measuring hole 8 penetrates through the upper surface and the lower surface of the rock sample 1, an L-shaped vent hole 9 is formed in the upper pressure head 4, the vent hole 9 penetrates through the right side surface and the lower surface of the upper pressure head 4, and one end of the vent hole 9 is communicated with one end of the measuring hole 8; the central position of the upper sealing gasket 2 is provided with a central hole which is aligned and communicated with the measuring hole 8 and the vent hole 9.
The press machine is connected with an upper piston 6 and a lower piston 7 of the press machine, the lower surface of the upper piston 6 of the press machine is jointed with the upper surface of the upper pressure head 4, and the upper surface of the lower piston 7 of the press machine is jointed with the lower surface of the lower pressure head 5; the positions of the upper piston 6 and the lower piston 7 of the press machine are adjusted through the press machine, so that the upper piston 6 of the press machine is tightly jointed with the upper pressure head 4, the lower piston 7 of the press machine is tightly jointed with the lower pressure head 5, certain pressure is applied to the rock sample 1, and the upper sealing gasket 2 and the lower sealing gasket 3 are ensured to fully seal the upper surface and the lower surface of the rock sample 1.
As shown in fig. 1, the vacuum suction pump 12 is provided with a connection pipe, and a free end of the connection pipe is communicated with the other end of the air vent 9. The connecting pipe is sequentially provided with a pressure gauge 10 and a valve 11, the valve 11 is positioned between the pressure gauge 10 and a vacuum air pump 12, the pressure of the measuring hole 8 of the rock sample 1 is adjusted and controlled through the vacuum air pump 12 and the valve 11, and the pressure value of the measuring hole 8 is read through the pressure gauge 10.
The invention provides a testing method adopting the rock sample gas permeability testing device, which comprises the following steps:
step (1), drilling a measuring hole 8 of a rock sample 1
A circular measuring hole 8 is drilled along the central axis of the cylindrical rock sample 1 by utilizing rock processing equipment, and the measuring hole 8 penetrates through the upper surface and the lower surface of the rock sample 1.
Step (2), gas permeability testing device for assembling rock sample 1
The vent hole 9 of the upper pressure head 4 and the vacuum air pump 12 are connected through a connecting pipe arranged on the vacuum air pump 12, and a valve 11 on the connecting pipe is closed.
Mounting the lower pressure head 5 on a lower piston 7 of the press; placing the lower seal gasket 3 on the lower pressure head 5; placing a rock sample 1 on a lower sealing gasket 3; placing the upper sealing gasket 2 on the upper surface of the rock sample 1, and aligning the central hole of the upper sealing gasket 2 and the measuring hole 8 of the rock sample 1; placing the upper pressure head 4 on the upper sealing gasket 2, and aligning the vent hole 9 of the upper pressure head 4 and the central hole of the upper sealing gasket 2; the upper piston 6 of the press is mounted on the upper ram 4.
Starting the press machine, and adjusting the positions of an upper piston 6 and a lower piston 7 of the press machine to enable the upper piston 6 of the press machine to be tightly jointed with the upper pressure head 4 and the lower piston 7 of the press machine to be tightly jointed with the lower pressure head 5; a press is used to apply a certain pressure to the rock sample 1 so that the upper and lower gaskets 2 and 3 substantially seal the upper and lower surfaces of the rock sample 1.
Step (3) establishing a negative pressure environment of the gas permeability testing device of the rock sample 1
Opening a valve 11 on a connecting pipe arranged on a vacuum air pump 12, starting the vacuum air pump 12 to pump air; until the display value of the pressure gauge 10 reaches the minimum pressure Pmin，PminThe value of (A) is the minimum air pressure (P) which can be reached by the continuous air pumping of the vacuum air pump 12minIs less than 0.5 times of atmospheric pressure Patm(ii) a The valve 11 is closed, and the vacuum air pump 12 is closed; at the same time recording this time as time t0And starting a stopwatch to record time.
Step (4) recording the gas pressure recovery process in the measuring hole 8 of the rock sample 1
Because the gas permeation of rock sample 1, atmospheric pressure in measuring hole 8 resumes gradually, and measuring hole 8 communicates with the connecting pipe through air vent 9, measures the atmospheric pressure in measuring hole 8 through manometer 10 on the connecting pipe.
And recording the reading P of the pressure gauge 10 at different moments t in the pressure recovery process to obtain P-t data, and making a schematic diagram of the air pressure change process of the measuring hole by taking t as an abscissa and P as an ordinate, as shown in FIG. 2.
Step (5) calculating the gas permeability of the rock sample 1
Calculating to obtain initial values of different gas permeability K according to the P-t data obtained in the step (4), and calculating to obtain a P-t curve by using a circular hole radiation flow theoretical solution; and (4) comparing the P-t curve obtained by calculation with the P-t data obtained in the step (4), and calculating to obtain the value of the optimal gas permeability K according to the principle of the least square method, wherein the value of the optimal gas permeability K is used as the final value of the gas permeability K.
The theoretical solution formula of the circular hole radiation flow is as follows:
wherein the content of the first and second substances,
p is the air pressure in the process of recovering the air pressure in the rock sample measuring hole, and the unit is Pa;
Patmis at atmospheric pressure in Pa, and is taken at room temperature to be 105Pa；
PminThe set minimum air pressure is Pa, and the value is less than 0.5 times of the atmospheric pressure Patm；
t0For the pressure gauge 10 to read a minimum pressure PminThe unit of time corresponding to the time is s;
t is the corresponding moment when the reading of the pressure gauge 10 is P, and the unit is s;
mu is the dynamic viscosity coefficient of air, the unit is Pa.s, and the coefficient is 1.9 multiplied by 10 under the condition of room temperature-5Pa·s；
DhAnd DsThe diameter of the measurement hole and the rock sample, respectively, in m, is shown in fig. 3.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, 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 prior art can be adopted in the content which is not described in detail in the invention.
Claims (21)
1. A rock sample gas permeability testing apparatus, characterized in that the apparatus comprises: the sealing assembly is connected with the rock sample (1) and used for sealing the rock sample (1); the pressurizing assembly is connected with the sealing assembly and used for applying pressure to the rock sample (1); the air exhaust assembly is connected with the sealing assembly and is used for providing a negative pressure environment for the rock sample (1).
2. A rock sample gas permeability testing device according to claim 1, characterized in that the sealing assembly comprises an upper ram (4) and a lower ram (5); the pressurizing assembly comprises an upper piston (6) of the press machine, a lower piston (7) of the press machine and the press machine; the air pumping assembly comprises a vacuum air pump (12); the lower surface of the upper pressure head (4) is jointed with the upper surface of the rock sample (1), and the upper surface of the lower pressure head (5) is jointed with the lower surface of the rock sample (1); the press machine is connected with an upper piston (6) and a lower piston (7) of the press machine, the lower surface of the upper piston (6) of the press machine is jointed with the upper surface of the upper pressure head (4), and the upper surface of the lower piston (7) of the press machine is jointed with the lower surface of the lower pressure head (5); the vacuum air pump (12) is provided with a connecting pipe, and the free end of the connecting pipe is communicated with the other end of the vent hole (9).
3. A rock sample gas permeability testing apparatus according to claim 2, wherein the seal assembly further comprises: the device comprises an upper sealing gasket (2) and a lower sealing gasket (3), wherein the upper sealing gasket (2) is arranged between the upper surface of a rock sample (1) and the lower surface of an upper pressure head (4), and the lower sealing gasket (3) is arranged between the lower surface of the rock sample (1) and the upper surface of a lower pressure head (5).
4. A rock sample gas permeability testing apparatus according to claim 3, wherein the gas evacuation assembly further comprises: manometer (10) and valve (11), manometer (10) and valve (11) set gradually on the connecting pipe, and valve (11) are located between manometer (10) and vacuum aspiration pump (12).
5. The device for testing the gas permeability of the rock sample according to claim 4, wherein a measuring hole (8) is formed in the central axis position of the rock sample (1), the measuring hole (8) penetrates through the upper surface and the lower surface of the rock sample (1), the upper pressure head (4) is provided with a vent hole (9), the vent hole (9) penetrates through the right side surface and the lower surface of the upper pressure head (4), and one end of the vent hole (9) is communicated with one end of the measuring hole (8).
6. The device for testing the gas permeability of the rock sample according to claim 5, characterized in that the upper sealing gasket (2) is provided with a central hole at a central position, and the central hole is aligned and communicated with the measuring hole (8) and the vent hole (9).
7. A rock sample gas permeability testing device according to claim 3, characterized in that the upper gasket (2) and the lower gasket (3) are rubber.
8. A rock sample gas permeability test device according to claim 3, characterized in that the upper seal (2) and the lower seal (3) are circular.
9. A rock sample gas permeability test apparatus according to claim 2, wherein the upper head (4) and the lower head (5) are cylindrical.
10. A rock sample gas permeability test apparatus according to claim 5, wherein the vent holes (9) are L-shaped.
11. A method of testing using the rock sample gas permeability testing apparatus of any one of claims 6 to 10, the method comprising the steps of:
step (1), drilling a measuring hole (8) of a rock sample (1);
step (2), assembling a gas permeability testing device of the rock sample (1);
step (3), establishing a negative pressure environment of the gas permeability testing device of the rock sample (1);
step (4), recording the gas pressure recovery process in the measuring hole (8) of the rock sample (1);
and (5) calculating the gas permeability of the rock sample (1).
12. The method for testing the gas permeability of the rock sample according to claim 11, wherein the step (1) is specifically as follows: and drilling a measuring hole (8) along the central axis of the rock sample (1), wherein the measuring hole (8) penetrates through the upper surface and the lower surface of the rock sample (1).
13. The method of claim 11, wherein the step (2) comprises:
step (2.1), connecting the air extraction assembly and the sealing assembly;
step (2.2), installing a pressurizing assembly and a sealing assembly, enabling the sealing assembly to be connected with the rock sample (1), and enabling the pressurizing assembly to be connected with the sealing assembly;
and (2.3) pressurizing the rock sample (1) by using the pressurizing assembly, so that the sealing assembly can fully seal the upper surface and the lower surface of the rock sample (1).
14. The method for testing the gas permeability of the rock sample according to claim 13, wherein the step (2.1) is specifically as follows: the vacuum air pump (12) and the upper pressure head (4) are connected through a connecting pipe.
15. The method for testing gas permeability of a rock sample according to claim 13, wherein the step (2.2) is specifically: a lower pressure head (5) is arranged on a lower piston (7) of the press; placing the lower sealing gasket (3) on the lower pressure head (5); placing a rock sample (1) on a lower sealing gasket (3); placing the upper sealing gasket (2) on the upper surface of the rock sample (1) and aligning the central hole of the upper sealing gasket (2) and the measuring hole (8) of the rock sample (1); placing the upper pressure head (4) on the upper sealing gasket (2) and aligning the vent hole (9) of the upper pressure head (4) and the central hole of the upper sealing gasket (2); and an upper piston (6) of the press machine is arranged on the upper pressure head (4).
16. The method for testing gas permeability of a rock sample according to claim 13, wherein the step (2.3) is specifically: and starting the press, adjusting the positions of an upper piston (6) and a lower piston (7) of the press, and applying pressure to the rock sample (1) so that the upper sealing gasket (2) and the lower sealing gasket (3) can fully seal the upper surface and the lower surface of the rock sample (1).
17. The method for testing the gas permeability of the rock sample according to claim 11, wherein the step (3) is specifically as follows: the valve (11) is opened, the vacuum air pump (12) is started to pump air until the air is pumpedUntil the display value of the pressure gauge (10) reaches the minimum air pressure PminClosing the valve (11) and closing the vacuum air pump (12); at the same time recording this time as time t0。
18. The method of claim 17, wherein P is the gas permeability of the rock sampleminIs less than 0.5 times the atmospheric pressure Patm。
19. The method for testing the gas permeability of the rock sample according to claim 11, wherein the step (4) is specifically as follows: and measuring the air pressure in the measuring hole (8) through the pressure gauge (10), and recording the reading P of the pressure gauge (10) at different moments t in the pressure recovery process.
20. The method for testing the gas permeability of the rock sample according to claim 11, wherein the step (5) is specifically as follows: and (4) according to the least square principle, performing solution fitting on the P-t data obtained in the step (4) by using a circular hole radiation flow theory, and calculating to obtain the final gas permeability K.
21. The method for testing gas permeability of a rock sample according to claim 20, wherein the circular hole radiation flow theoretical solution formula is:
wherein the content of the first and second substances,
p is the air pressure in the process of recovering the air pressure in the rock sample measuring hole, and the unit is Pa;
Patmis atmospheric pressure in Pa;
Pminsetting the minimum air pressure in Pa;
t0for the pressure gauge reading to be at a minimum pressure PminThe unit of time corresponding to the time is s;
t is the corresponding moment when the reading of the pressure gauge is P, and the unit is s;
mu is the dynamic viscosity coefficient of air with the unit of Pa.s;
Dhand DsRespectively the diameter of the measuring hole and the rock sample, in m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504401.2A CN112611698A (en) | 2020-12-18 | 2020-12-18 | Rock sample gas permeability testing device and testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504401.2A CN112611698A (en) | 2020-12-18 | 2020-12-18 | Rock sample gas permeability testing device and testing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112611698A true CN112611698A (en) | 2021-04-06 |
Family
ID=75240565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011504401.2A Pending CN112611698A (en) | 2020-12-18 | 2020-12-18 | Rock sample gas permeability testing device and testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112611698A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538217A (en) * | 2023-11-27 | 2024-02-09 | 中国科学院西北生态环境资源研究院 | Device and method for analyzing permeation and migration characteristics of helium-rich natural gas in rock |
-
2020
- 2020-12-18 CN CN202011504401.2A patent/CN112611698A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538217A (en) * | 2023-11-27 | 2024-02-09 | 中国科学院西北生态环境资源研究院 | Device and method for analyzing permeation and migration characteristics of helium-rich natural gas in rock |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109459313B (en) | In-situ test method and system for mechanical behavior and seepage characteristics of coal rock mass | |
| CN111220525B (en) | Supercritical carbon dioxide rock fracture seepage device under high-temperature and high-pressure conditions | |
| CN107340101B (en) | Gas micro-leakage detection device and method for sealing device | |
| CN105466831B (en) | A kind of measuring gas permebility device | |
| US20200300746A1 (en) | Physical simulation and calibration device and method for formation pressure testing | |
| CN109030318B (en) | Pressure chamber structure and permeability testing system | |
| CN110749434A (en) | System and method for testing pressure maintaining characteristic of pressure maintaining cabin of coring device | |
| CN105910761A (en) | Tube flange gas leakage detection device | |
| CN214668429U (en) | Rock sample gas permeability testing arrangement | |
| CN109470616A (en) | Rock multifunction seepage test macro | |
| CN107014698A (en) | The measurement apparatus and measuring method of a kind of high temperature compressed coefficient of rock and permeability | |
| CN112611698A (en) | Rock sample gas permeability testing device and testing method | |
| CN214174090U (en) | Coal rock anisotropic adsorption expansion and permeability testing device | |
| CN113790853A (en) | Comprehensive test platform for dynamic sealing performance of gas storage cap rock | |
| CN117538217A (en) | Device and method for analyzing permeation and migration characteristics of helium-rich natural gas in rock | |
| CN110927359B (en) | Experimental test device and method for gas loss content in low-permeability porous medium coring process | |
| CN112082922A (en) | Method for determining seepage permeability of large rectangular flat model rock sample plane | |
| CN111929214A (en) | Coal bed gas seepage and coal adsorption methane desorption experimental device and method under ultrasonic action | |
| CN108279118A (en) | Subsea production tree tests system | |
| CN109459371B (en) | Rock material gas permeability testing device and testing method thereof | |
| CN107389282B (en) | Air seal test method and test system | |
| CN209400384U (en) | A kind of rock material measuring gas permebility device | |
| CN108457643B (en) | Water-invasion drilling gas pressure measuring method based on vacuum condition | |
| CN216525791U (en) | Phase change simulation device and system for fluid in shale pores | |
| CN113466089B (en) | Shale core imbibition measuring device and method capable of intelligently controlling pressure |
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 |