CN213986110U - Indoor convenient survey system of tight rock permeability - Google Patents
Indoor convenient survey system of tight rock permeability Download PDFInfo
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- CN213986110U CN213986110U CN202022447016.0U CN202022447016U CN213986110U CN 213986110 U CN213986110 U CN 213986110U CN 202022447016 U CN202022447016 U CN 202022447016U CN 213986110 U CN213986110 U CN 213986110U
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Abstract
The utility model provides an indoor convenient survey system of fine and close rock permeability can survey the permeability of rock and obtain its permeability indoor convenient, effectively. The system comprises: an air supply bottle; the air storage chamber is communicated with the air supply bottle and is provided with an air outlet; the supporting seat is used for supporting the rock sample; the sealing plug blocks the opening of the cavity of the rock sample, and an inflation hole is arranged on the watertight plug and serves as a pressurizing channel; the control valve is arranged at the outlet of the air supply bottle; the pressure reducing valve is arranged on a communication pipeline between the air supply bottle and the air storage chamber; the air supply pipeline is used for communicating the air filling hole of the waterproof plug with the air supply bottle and the air storage chamber; the air pressure monitoring sensor is arranged on one side of the air supply pipeline close to the waterproof plug and is used for monitoring the change of air pressure in the cavity in real time; and a valve portion including: the first valve is arranged on a communication pipeline between the air supply bottle and the air storage chamber, the second valve is arranged at the air outlet of the air storage chamber, and the third valve is arranged on the air supply pipeline.
Description
Technical Field
The utility model belongs to rock permeability research field, concretely relates to indoor convenient survey system of fine and close rock permeability.
Background
The study of rock permeability properties is a relatively important area in geotechnical engineering. The method has the advantages that the permeability of the rock can be conveniently and effectively obtained, and the method has very important significance for engineering problems such as hydrogeological rules for revealing characteristics such as underground water flow or pollutant migration, dam site selection in hydraulic engineering, side slope seepage stability analysis, development of oil and gas fields, deep geological disposal of high-level waste and the like.
After the seepage law established by Darcy in 1856 lays a foundation for the steady-state method for measuring the permeability of the rock, the steady-state method for measuring the permeability of the rock is greatly popularized and applied, but the steady-state method is long in permeability measurement time and has large permeability measurement error for low-permeability rock. Hvorslevr in 1951 proposed a micro-water experimental method, i.e. an oscillatory penetration test, in which the penetration rate was determined by the amplitude attenuation and phase shift of the waves. And then, a transient pressure pulse method is proposed by Brace in 1968 and applied to permeability measurement of granite, and has the advantages that a more accurate test result can be obtained within a shorter time, an effective method is provided for permeability measurement of compact rock, but the method has higher requirements on rock sample preparation, experimental device tightness and pressure monitoring instrument precision, and the process is more complex than that of a steady-state method.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned problem and go on, aim at provides an indoor convenient survey system of fine and close rock permeability, can be indoor convenient, survey the permeability of rock effectively.
The utility model discloses a realize above-mentioned purpose, adopted following scheme:
the utility model provides an indoor convenient survey system of fine and close rock permeability, a serial communication port, include: an air supply bottle; the air storage chamber is communicated with the air supply bottle and is provided with an air outlet; the supporting seat is used for supporting the rock sample; the sealing plug blocks the opening of the cavity of the rock sample, and an inflation hole is arranged on the watertight plug and serves as a pressurizing channel; the control valve is arranged at the outlet of the air supply bottle; the pressure reducing valve is arranged on a communication pipeline between the air supply bottle and the air storage chamber; the air supply pipeline is used for communicating the air filling hole of the waterproof plug with the air supply bottle and the air storage chamber; the air pressure monitoring sensor is arranged on one side of the air supply pipeline close to the waterproof plug and is used for monitoring the change of air pressure in the cavity in real time; and a valve portion including: the first valve is arranged on a communication pipeline between the air supply bottle and the air storage chamber, the second valve is arranged at the air outlet of the air storage chamber, and the third valve is arranged on the air supply pipeline.
The utility model relates to an indoor convenient survey system of fine and close rock permeability can also include: the rock sample is internally provided with a cavity, the shortest distances from any point of the boundary of the cavity to the outer surface of the rock sample are equal, and the upper part of the cavity is provided with an opening, and the lower part of the cavity does not penetrate through the rock sample.
The utility model relates to an indoor convenient survey system of fine and close rock permeability can also have such characteristic: the rock sample is cylindrical or square, the cavity is cylindrical, and the shortest distance is l, so that l is 50-100 mm.
The utility model relates to an indoor convenient survey system of fine and close rock permeability can also have such characteristic: the supporting seat includes: the base and fix on the base, be used for the fixed support rock specimen's support ring.
The utility model relates to an indoor convenient survey system of fine and close rock permeability can also have such characteristic: the waterproof plug is a waterproof rubber plug.
The utility model relates to an indoor convenient survey system of fine and close rock permeability can also include: and the control part is in communication connection with the control valve, the pressure reducing valve, the air pressure monitoring sensor and the valve part, controls the operation of the control valve, the pressure reducing valve, the air pressure monitoring sensor and the valve part and acquires data.
The utility model relates to an indoor convenient survey system of fine and close rock permeability can also include: and an input display unit which is connected to the control unit in a communication manner and displays the data acquired by the control unit.
Action and effect of the utility model
The utility model provides an indoor convenient survey system of fine and close rock permeability is owing to adopted above technical scheme, consequently can more convenient effectual permeability of measuring the rock that awaits measuring, especially to the permeability measurement of hypotonic, fine and close rock. And, compared with the prior art method, the operation is more convenient, the device is simpler, need not to seal the both ends of sample, also need not to accomplish the experiment in triaxial apparatus or permeameter, can not bring the error because the seal is difficult to guarantee with easy gas leakage and for the experiment, the error is littleer, the result is more accurate, measuring effect is better, especially adapted uses widely on a large scale.
Drawings
FIG. 1 is a schematic structural diagram of a compact rock permeability indoor convenient measuring system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rock sample according to an embodiment of the present invention;
fig. 3 is a sectional view taken in the direction of a-a in fig. 2.
Detailed Description
The compact rock permeability indoor convenient measuring system related to the present invention is explained in detail with reference to the attached drawings.
< example >
As shown in fig. 1, the portable tight rock permeability chamber measuring system 10 includes a sample preparation unit, an air supply cylinder 11, an air storage chamber 12, a support base 13, a watertight plug 14, a control valve 15, a pressure reducing valve 16, an air supply line 17, an air pressure monitoring sensor 18, a valve unit 19, and a computer 20.
The sample preparation part is used for processing the rock to be detected, so that a rock sample S with a cavity is formed inside the rock to be detected, and the shortest distance from any point of the cavity boundary to the outer surface of the rock sample SThe distances are equal, and the upper part of the cavity C is provided with an opening, and the lower part of the cavity C does not penetrate through the rock sample S. As shown in fig. 2 and 3, in this embodiment, the outer surface of the processed rock sample S is cylindrical, the shortest distance from any point of the boundary of the cavity C to the outer surface of the rock sample S is denoted as l, and the outer diameter of the rock sample S is
The inner diameter of the cavity C is
Then
l＝50mm～100mm。
The gas supply cylinder 11 is used to supply the test gas, and in this embodiment, the gas supply cylinder 11 is a nitrogen cylinder.
The air storage chamber 12 is communicated with the air supply bottle 11, and is provided with an air inlet at the top end and an air outlet at the lower end.
The support base 13 includes a base 131 and a support ring 132, and the support ring 132 is fixed on the base 131 and is used for fixedly supporting the rock sample S to "cushion" the rock sample S.
The watertight plug 14 seals the plug to block the opening of the cavity C, and the watertight plug 14 is provided with an inflation hole as a pressurizing passage. In this embodiment, the watertight plug 14 is a watertight rubber plug.
A control valve 15 is provided at the outlet of the air supply bottle 11.
The pressure reducing valve 16 is provided in a communication line between the gas cylinder 11 and the gas reservoir 12.
An air supply line 17 connects the air filling hole of the watertight plug 14 with the air supply cylinder 11 and the air reservoir 12.
An air pressure monitoring sensor 18 is arranged on the side of the air supply pipeline 17 close to the watertight plug 14 and is used for monitoring the air pressure change in the cavity C in real time.
The valve portion 19 includes: a first valve 191 provided in a communication line between the gas cylinder 11 and the gas reservoir 12, a second valve 192 provided at the exhaust port of the gas reservoir 12, and a third valve 193 provided in the gas supply line 17.
In this embodiment, all the pipes/tubes are made of metal tubes.
The computer 20 is used for controlling the operation of the whole indoor convenient measuring system 10 for the permeability of the tight rocks and obtaining test data to obtain a measuring result, and comprises a control part and an input display part.
The control part is connected with the control valve 15, the pressure reducing valve 16, the air pressure monitoring sensor 18 and the valve part 19 in a communication way, and controls the operation of the control valve, the pressure reducing valve, the air pressure monitoring sensor and the valve part to acquire data.
The input display unit is connected to the control unit in communication, and displays the data acquired by the control unit and the permeability of the rock sample S.
The above is a specific structure of the compact rock permeability indoor convenient determination system 10, and the following is a description of the test operation process of the compact rock permeability indoor convenient determination system 10.
The indoor convenient determination method for permeability of the dense rock provided by the embodiment comprises the following steps:
step 1. sample preparation
Taking the rock to be measured, drilling
Standard rock sample is prepared, and then a drill is drilled along the axial line on the basis of the standard rock sample
The standard rock sample is internally provided with a cavity C, so that the prepared rock sample S is obtained.
Step 2. sample loading
The rock sample S is erected on the support ring 132, the opening of the cavity C is blocked by the waterproof plug 14, the blocked part is sealed in a waterproof way, and an inflation hole is reserved on the waterproof plug 14 to be used as a pressurization channel.
Step 3, pre-charging balance
And opening the control valve 15 and the third valve 193, adjusting the reducing valve 16 to charge air and store the air into the cavity C of the rock sample S, monitoring the air pressure change in real time through the air pressure monitoring sensor 18, and after the preset pressure value is reached, finishing charging, and closing the control valve 15.
Step 4 gas infiltration
The computer calculates according to the air pressure change data monitored by the air pressure monitoring sensor 18 in real time by adopting the following formula to obtain the permeability of the rock sample S:
in the formula, PuFor the initial pressure after the completion of the inflation of the cavity C monitored by the air pressure monitoring sensor, Δ P is 0.8PuAnd t is the pressure inside the cavity monitored by the air pressure monitoring sensor from PuDecrease the time elapsed of Δ P, VuIs the volume in the cavity C, mu is the dynamic viscosity coefficient of the fluid, CfAnd (3) taking the compression coefficient of the fluid, wherein A is the area of the wall of the cavity C, l is the shortest distance from any point of the boundary of the cavity C to the outer surface of the rock sample, and k is the permeability to be measured.
Step 5, pressure relief and multiple tests
First, the first and second valves 191 and 192 are opened, and the third valve 193 is opened, so that the gas in the pipe is exhausted and the pressure is returned to the local atmospheric pressure. After each test is finished, the step needs to be carried out to ensure that the air pressure state of the internal pipeline is kept consistent when the test is just started.
Thereafter, the second valve 192 is closed, and steps 3 to 4 are repeated, and a plurality of tests result to reduce the test error. The test results and the monitoring data are displayed to a measurer through an input display part. After the test is completed, the rock sample S is removed, the second valve 192 is opened, the gas storage chamber 12 is exhausted, the control valve 15 and the third valve 193 are checked and closed, and the test is completed.
The above embodiments are merely illustrative of the technical solutions of the present invention. The compact rock permeability indoor convenient measuring system of the present invention is not limited to the structure described in the above embodiments, but is subject to the scope defined by the claims. Any modification, or supplement, or equivalent replacement made by those skilled in the art on the basis of the embodiments of the present invention is within the scope of the claimed invention.
Claims (7)
1. An indoor convenient tight rock permeability determination system, comprising:
an air supply bottle;
the air storage chamber is communicated with the air supply bottle and is provided with an air outlet;
the supporting seat is used for supporting the rock sample;
the sealing plug blocks the opening of the cavity of the rock sample, and an inflation hole is arranged on the watertight plug and serves as a pressurization channel;
the control valve is arranged at the outlet of the air supply bottle;
the pressure reducing valve is arranged on a communication pipeline between the air supply bottle and the air storage chamber;
the air supply pipeline is used for communicating the air filling hole of the waterproof plug with the air supply bottle and the air storage chamber;
the air pressure monitoring sensor is arranged on one side of the air supply pipeline close to the waterproof plug and is used for monitoring the change of air pressure in the cavity in real time; and
a valve portion comprising: the gas supply device comprises a first valve arranged on a communication pipeline between the gas supply bottle and the gas storage chamber, a second valve arranged at the gas outlet of the gas storage chamber, and a third valve arranged on the gas supply pipeline.
2. The indoor portable dense rock permeability determination system of claim 1, further comprising:
the rock sample is internally provided with a cavity, and the shortest distances from any point of the boundary of the cavity to the outer surface of the rock sample are equal;
wherein the cavity has an upper opening and a lower portion that does not penetrate through the rock sample.
3. The compact rock permeability indoor convenience assay system of claim 2, wherein:
the rock sample is cylindrical or square, the cavity is cylindrical, and the shortest distance is l, so that l is 50-100 mm.
4. The compact rock permeability indoor convenience assay system of claim 1, wherein:
wherein, the supporting seat includes: the base and fix on the base, be used for the fixed support the support ring of rock specimen.
5. The compact rock permeability indoor convenience assay system of claim 1, wherein:
wherein, the waterproof plug is a waterproof rubber plug.
6. The indoor portable dense rock permeability determination system of claim 1, further comprising:
and the control part is in communication connection with the control valve, the pressure reducing valve, the air pressure monitoring sensor and the valve part, controls the operation of the control valve, the pressure reducing valve, the air pressure monitoring sensor and the valve part and acquires data.
7. The indoor portable dense rock permeability determination system of claim 6, further comprising:
and an input display part which is connected with the control part in a communication way and displays the data acquired by the control part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022447016.0U CN213986110U (en) | 2020-10-29 | 2020-10-29 | Indoor convenient survey system of tight rock permeability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022447016.0U CN213986110U (en) | 2020-10-29 | 2020-10-29 | Indoor convenient survey system of tight rock permeability |
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| CN213986110U true CN213986110U (en) | 2021-08-17 |
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| CN202022447016.0U Active CN213986110U (en) | 2020-10-29 | 2020-10-29 | Indoor convenient survey system of tight rock permeability |
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