CN114965959A - Static sounding calibration tank device for pressure-maintaining sediment online detection - Google Patents

Static sounding calibration tank device for pressure-maintaining sediment online detection Download PDF

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CN114965959A
CN114965959A CN202210582101.9A CN202210582101A CN114965959A CN 114965959 A CN114965959 A CN 114965959A CN 202210582101 A CN202210582101 A CN 202210582101A CN 114965959 A CN114965959 A CN 114965959A
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sample
pressure maintaining
static sounding
pressure
cylinder
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CN114965959B (en
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赵佳飞
沈实
宋永臣
刘瑜
储佳伟
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Dalian University of Technology
Ningbo Research Institute of Dalian University of Technology
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Ningbo Research Institute of Dalian University of Technology
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    • G01—MEASURING; TESTING
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    • G01N33/24—Earth materials
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

The invention relates to a static sounding calibration tank device for online detection of pressure maintaining sediments, wherein a static sounding probe is positioned in the middle of one end of a low-temperature sample pressure maintaining cylinder and is used for carrying out a static sounding experiment on a sample; the low-temperature sample pressure maintaining cylinder is a main body for bearing a static sounding experiment and is used for filling an experiment sample; the ball valve module is used for controlling the communication state between the low-temperature sample pressure maintaining cylinder and the sample conveying system and ensuring the sample pressure after the static sounding experiment; the sample conveying system is used for conveying a sample to the low-temperature sample pressure maintaining cylinder; the pressure maintenance system is used for maintaining the pressure of the sample in the experimental process; the data acquisition system is used for acquiring experimental data of static sounding; the device can be matched with the existing online detection equipment for the pressure-maintaining sediment, and can realize the rapid static sounding calibration tank experiment while maintaining the pressure-maintaining sediment sample of the hydrate.

Description

Static sounding calibration tank device for pressure maintaining sediment online detection
Technical Field
The invention relates to a static sounding calibration tank device for online detection of pressure-maintaining sediments, and belongs to the technical field of online detection of natural gas hydrate sediments and basic physical properties.
Background
The ocean is a huge resource treasury, and with the high population of the dependence of social economy on oil and gas energy, the development of ocean energy is gradually advancing to deep water. The research technical means of submarine oil and gas resource exploration and development is also greatly developed. The natural gas hydrate is a cage-shaped compound formed by combining methane gas and water under a certain temperature and pressure condition. 1m in ideal state 3 164m under standard condition can be released by natural gas hydrate decomposition 3 Natural gas, therefore, natural gas hydrate is regarded as unconventional energy with huge energy potential, in order to effectively develop and utilize natural gas hydrate, at present, natural gas hydrate trial production is carried out twice in the south China Haishuhu sea area, certain knowledge is obtained, and a certain experience basis is provided for development and utilization of natural gas hydrate resources.
Static sounding is the most important means for acquiring field engineering geological parameters, and a static sounding test technology is widely applied to south sea hydrate geological survey and can invert various mechanical properties of deep sea hydrate sediments. However, static sounding has strong regional dependence, that is, engineering static sounding parameters obtained in a certain region cannot be directly applied to other regions due to the influence of factors such as soil quality, pore permeability, soil components and the like, so that a static sounding calibration tank experiment needs to be carried out to perform soil body checking. However, because the acquisition difficulty of the undisturbed deep sea sediment is very large, at present, a static sounding calibration tank system capable of testing a deep sea pressure maintaining sample still does not exist.
Disclosure of Invention
The invention aims to provide an accurate static sounding calibration tank experimental device for realizing mechanical property acquisition, which can be used in combination with a hydrate deposit pressure maintaining shipborne online detection device, and can complete a static sounding calibration tank experiment while storing a pressure maintaining sample.
A static sounding calibration tank device for pressure maintaining sediment online detection comprises:
the static sounding unit comprises a sample pressure maintaining cylinder, the sample pressure maintaining cylinder is provided with a pressure maintaining cavity, the open end of the sample pressure maintaining cylinder is communicated with the pressure maintaining cavity, a static sounding probe is fixedly installed at the closed end of the sample pressure maintaining cylinder, and the static sounding probe extends into the pressure maintaining cavity;
the data acquisition system is used for acquiring the measurement data acquired by the static sounding probe and storing the measurement data;
the sample conveying unit comprises a sample conveying pressure maintaining cylinder, the sample conveying pressure maintaining cylinder comprises an accommodating cavity, the open end of the sample conveying pressure maintaining cylinder is communicated with the accommodating cavity, a sample conveying claw is arranged at the closed end of the sample conveying pressure maintaining cylinder, and the sample conveying claw extends into the accommodating cavity;
the static sounding unit and the sample conveying unit are connected together by the ball valve module, and the on-off of the static sounding unit and the sample conveying unit is controlled by the ball valve module; when the ball valve module is opened, the sample conveying claw can push the sample into the pressure maintaining cavity of the pressure maintaining cylinder from the accommodating cavity and press the pressure maintaining cavity to the static sounding probe, and the static sounding probe measures the sample in the pushing process.
The invention provides a static sounding calibration tank device for online detection of pressure-maintaining sediments, which can realize static sounding calibration tank experiments on rock cores while conveying and storing pressure-maintaining rock core samples.
Preferably, the method further comprises the following steps: and the pressure maintaining system is communicated with the pressure maintaining cavity of the static sounding unit and the accommodating cavity of the sample conveying unit through a first high-pressure valve and a second high-pressure valve respectively. The integrated design of the pressure maintaining cylinder and the multifunctional static sounding probe is adopted, the structure is compact, the reliability is high, and the integrated pressure maintaining cylinder is suitable for field environments such as executing shipborne exploration tasks.
Preferably, the low-temperature control unit maintains the temperature of the pressure maintaining cavity of the static sounding unit at a preset low-temperature value, and besides the static sounding check tank experiment can be performed on the pressure maintaining sample, the low-temperature sample pressure maintaining cylinder in the invention can be matched with the ball valve module to realize long-time storage of the hydrate in-situ pressure maintaining sample
Preferably, the low temperature control unit includes: and the temperature control outer sleeve is wrapped outside the sample pressure maintaining cylinder, and can realize temperature control in a mode of injecting constant-temperature fluid into the temperature control outer sleeve or in a semiconductor refrigeration mode.
Preferably, the static sounding probe is arranged coaxially with the sample transport jaw.
Preferably, the data acquisition system comprises a data acquisition box and a data transmission line; the data acquisition box can acquire and record various data in the static sounding experiment process through the data transmission line and the multifunctional static sounding probe; the miniaturized data acquisition box is arranged outside the low-temperature sample pressure maintaining cylinder, and can realize field test firstly and laboratory reading later.
The invention also provides a static sounding method for online detection of pressure maintaining sediments, which comprises the following steps:
s1) sample conveyance process: firstly, the ball valve module is in a closed state, a sample is sealed in the sample conveying pressure-maintaining cylinder, and a pressure maintaining system is utilized to maintain the water pressure in the sample conveying pressure-maintaining cylinder; then, the other end of the ball valve module is connected with a sample pressure maintaining cylinder, a pressure maintaining system is used for filling water into the sample pressure maintaining cylinder, and the same pressure as that of the sample conveying pressure maintaining cylinder is maintained; opening the ball valve module to enable the sample pressure maintaining cylinder to be communicated with the sample conveying pressure maintaining cylinder, and pushing the sample into the sample pressure maintaining cylinder by using the sample conveying claw;
s2) static cone penetration test procedure: starting the static sounding probe, enabling the sample to move relative to the static sounding probe under the pushing of the sample conveying claw, enabling the static sounding probe to gradually penetrate into the sample, and recording the acquired measurement data by using the data acquisition system in the period;
s3) sample pressure holding storage process: when the sample is conveyed to the innermost end of the sample pressure maintaining cylinder, the ball valve module is closed, the ball valve module is separated from the sample pressure maintaining cylinder, and the connection between the sample pressure maintaining cylinder and the pressure maintaining system is disconnected.
Preferably, the method further comprises the following steps:
s4) temperature control process: the temperature control outer sleeve is arranged on the periphery of the sample pressure maintaining cylinder, and the low-temperature environment of the sample pressure maintaining cylinder is maintained in the whole sample conveying and static sounding experiment process.
Other advantageous effects of the present invention will be specifically described with reference to the embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a static sounding calibration tank device for online detection of pressure maintaining deposits according to the invention.
Fig. 2a, b, c and d are respectively different state diagrams of the static sounding calibration tank device system for on-line detection of pressure maintaining sediments.
Fig. 3 is a working flow chart of a static sounding calibration tank device for online detection of pressure maintaining deposits.
In the figure: 1: a multifunctional static sounding probe; 2 a: a pressure maintaining cylinder; 2 b: a temperature control outer sleeve; 2 c: sealing the static sounding probe; 3: a ball valve module; 4 a: a sample delivery pressure maintaining cylinder; 4 b: a sample transport jaw; 5 a: a high pressure plunger pump; 5 b: a high pressure valve; 6 a: a data acquisition box; 6 b: a data transmission line; 7: and (4) sampling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
referring to fig. 1 to 3, the embodiment provides a static sounding calibration tank device for online detection of pressure-maintaining deposits, and aims to maintain a phase equilibrium condition of a hydrate by pressure-maintaining and heat-preserving, obtain an undisturbed sample, and realize online detection of the pressure-maintaining deposits in a process of sampling the sample, that is, complete a static sounding process in a sample acquisition process.
In the sample collection process, a sample is collected from the sea bottom and stored in the drilling tool, then the drilling tool is connected with the sample conveying system through the ball valve, when the pressures at the two ends of the ball valve are equal, the ball valve is opened, the sample conveying claw extends out and grabs the sample to enter the sample conveying system, then the ball valve is closed, the state shown in the figure 2a is achieved, and the process that the sample is transferred from the drilling tool to the sample conveying system is completed. The part of the technology of the pressure-holding transfer cutting of the sample is the prior art and is not the innovation point of the document, so the description is not repeated.
The static sounding calibration tank device for online detection of the pressure maintaining sediment comprises a static sounding unit, wherein the static sounding unit comprises a sample pressure maintaining cylinder 2a, the sample pressure maintaining cylinder is provided with a pressure maintaining cavity, the open end of the sample pressure maintaining cylinder is communicated with the pressure maintaining cavity, a static sounding probe 1 is fixedly installed at the closed end of the sample pressure maintaining cylinder 2a, and the static sounding probe 1 extends into the pressure maintaining cavity; in the embodiment of the method, the static sounding probe 1 is a multifunctional static sounding probe 1, and integrates a plurality of modules including a mechanical property testing module, a multifunctional testing module and the like, the static sounding probe 1 is in the prior art and is not an improvement point of the embodiment, the placement and the use of the static sounding probe 1 are contributions of the embodiment to the prior art, in the embodiment, the multifunctional static sounding probe is installed in the center of the closed end of the sample pressure maintaining cylinder, and the sealing cover of the static sounding probe is used for sealing between the static sounding probe and the pressure maintaining cylinder and fixing the axial position of the static sounding probe.
A sample transport unit including a sample transport pressure retention cylinder 4a and a sample transport claw 4 b; the sample conveying pressure maintaining cylinder is connected with the ball valve module 3 and bears a sample conveying track; the sample conveying claw is controllable in movement speed and is responsible for grabbing and conveying a sediment sample into the low-temperature sample pressure maintaining cylinder, the sample conveying pressure maintaining cylinder 4a comprises an accommodating cavity, and the open end of the sample conveying pressure maintaining cylinder 4a is communicated with the accommodating cavity, so that the main body of the sample conveying pressure maintaining cylinder 4a is a cylindrical hollow metal cylinder with one closed end and one open end; the closed end of the sample conveying pressure maintaining cylinder 4a is provided with a sample conveying claw 4b, and the sample conveying claw 4b extends into the accommodating cavity.
The data acquisition system is used for acquiring measurement data acquired by the static sounding probe 1; the data acquisition system comprises a data acquisition box 6a and a data transmission line 6 b; the data acquisition box can acquire and record various data in the static sounding experiment process through the data transmission line and the multifunctional static sounding probe; the miniaturized data acquisition box is arranged outside the low-temperature sample pressure maintaining cylinder, and can realize field test firstly and laboratory reading later.
The static sounding device also comprises a ball valve module 3, wherein the ball valve module 3 connects the static sounding unit and the sample conveying unit together and controls the on-off of the static sounding unit and the sample conveying unit; when the ball valve module 3 is opened, the sample conveying claw 4b can push the sample 7 into the pressure maintaining cavity of the pressure maintaining cylinder 2a from the accommodating cavity and press the static sounding probe 1, and in the pushing process, the static sounding probe 1 measures the sample 7.
The invention has the beneficial effects that: the static cone penetration sediment calibration experiment is realized through an integrated design in a mode of fixing a static cone penetration probe and moving a sample; according to the structure, an additional static sounding probe driving system is not needed, the rock core power conveying and transferring mechanism of the existing shipborne pressure maintaining rock core on-line detection equipment is combined, namely the sample conveying system in the embodiment can realize that a pressure maintaining sample is conveyed to the sample pressure maintaining cylinder and simultaneously carries out a static sounding calibration tank experiment, and the whole device is simple and compact in structure, simple and convenient to operate and suitable for being used in shipborne field tasks and the like.
Example 2:
in addition to the foregoing embodiments, the present embodiment further includes a pressure maintaining system, which is respectively communicated with the pressure holding cavity of the static sounding unit and the accommodating cavity of the sample conveying unit through a first high-pressure valve and a second high-pressure valve, and in a possible implementation, the pressure maintaining system includes a high-pressure plunger pump 5a, a high-pressure valve 5b and a pipeline 5 c; the high-pressure plunger pump is connected with the high-pressure valve and the pipeline; the high-pressure valve and the pipeline are connected with the low-temperature sample pressure-maintaining cylinder and the sample conveying system; and controlling the high-pressure plunger pump to be in a constant pressure state, and controlling the pressure environment in the sample conveying and storing process through a high-pressure valve and a pipeline.
In this embodiment, the pressure maintaining system is adopted to simultaneously control the pressure of the pressure holding cavity of the static sounding unit and the pressure of the accommodating cavity of the sample conveying unit, so that the pressure environments in the pressure holding cavity of the static sounding unit and the pressure environment in the accommodating cavity of the sample conveying unit are the same, and the pressure state of the sample 7 is kept unchanged as much as possible, so that the later analysis data can accurately reflect the original components and the state of the sediment.
Example 3:
the present embodiment includes, in addition to the content of the foregoing embodiment, the following: and the low-temperature control unit maintains the temperature of the pressure maintaining cavity of the static sounding unit at a preset low-temperature value. The low temperature control unit includes: and the temperature control outer sleeve 2b is wrapped outside the sample pressure maintaining cylinder 2a, and the temperature control can be realized by injecting constant-temperature fluid into the temperature control outer sleeve or by using a semiconductor refrigeration mode.
Therefore, the low-temperature sample pressure maintaining cylinder can be matched with the ball valve module to realize long-time storage of the hydrate in-situ pressure maintaining sample besides the static sounding tank checking experiment of the pressure maintaining sample.
Example 4:
the present embodiment includes, in addition to the content of the foregoing embodiment, the following: the static sounding probe 1 is arranged coaxially with the sample conveying claw 4 b. Thus, a sample is conveyed to the low-temperature sample pressure maintaining cylinder through the sample conveying system, the sample is contacted with the multifunctional static sounding probe to form coaxial relative motion, and the static sounding probe 1 gradually penetrates into the sample 7; during which the data acquisition box 6a is used to record various data. The beneficial effects of coaxial setting are that the damage of static sounding probe 1 is difficult to take place on the one hand, and on the other hand can make the accurate measured data of static sounding probe 1.
Example 5:
the embodiment provides a static sounding method for online detection of pressure maintaining deposits, which comprises the following steps:
s1 sample conveyance process: firstly, the ball valve module is in a closed state and seals the sample 7 in the sample conveying pressure-maintaining cylinder 4a, and the pressure maintaining system is used for maintaining the water pressure inside the sample conveying pressure-maintaining cylinder 4a, and at the moment, the sample conveying pressure-maintaining cylinder 4a creates a pressure environment.
Then, the other end of the ball valve module 3 is connected with the sample pressure maintaining cylinder 2a, the sample pressure maintaining cylinder 2a is filled with water by using a pressure maintaining system, and the same pressure as that of the sample conveying pressure maintaining cylinder 4a is kept; when the pressures on the two sides of the ball valve module 3 are equal, the ball valve module 3 is opened to enable the sample pressure maintaining cylinder 2a to be communicated with the sample conveying pressure maintaining cylinder 4a, and the sample is pushed into the sample pressure maintaining cylinder 2a by using the sample conveying claw 4 b.
S2 static cone penetration test procedure: the method comprises the steps that the static sounding probe 1 is started, a sample 7 moves relative to the static sounding probe 1 under the pushing of the sample conveying claw 4b, the static sounding probe 1 always keeps fixed, the sample 7 moves towards the static sounding probe 1, the static sounding probe 1 penetrates into the sample 7 gradually, and during the period, the data acquisition system is used for recording acquired measurement data. Therefore, in the present embodiment, the measurement of the sample 7 by the static cone penetration probe 1 is completed during the process of loading the sample 7 into the sample pressure-holding cylinder 2a, and no other additional measurement step is required.
S3 sample pressure holding storage process: when the sample 7 is conveyed to the innermost end of the sample pressure maintaining cylinder 2a, the loading of the sample pressure maintaining cylinder 2a of the sample 7 is completed, the ball valve module 3 is closed, the ball valve module 3 is separated from the sample conveying pressure maintaining cylinder 4a, and the connection between the sample pressure maintaining cylinder 2a and the pressure maintaining system is disconnected. The present embodiment does not employ two ball valve modules 3 to seal the sample pressure-holding cylinder 2a and the sample transport pressure-holding cylinder 4a, respectively, and if two ball valve modules 3 are employed, the length, the weight, and the manufacturing cost of the entire apparatus in the axial direction are increased. Therefore, the fidelity sampling operation of the present embodiment is completed by connecting the sample delivery pressure-maintaining cylinder 4a and the sample pressure-maintaining cylinder 2a in sequence and disconnecting only one ball valve module 3, which is another important contribution of the method of the present embodiment.
In addition, the method can also comprise the following steps:
s4 temperature control process: the temperature control outer sleeve 2b is arranged on the periphery of the sample pressure maintaining cylinder 2a, and the low-temperature environment of the sample pressure maintaining cylinder 2a is maintained in the whole sample conveying and static sounding experiment process. For example, the constant temperature fluid is kept to be circularly injected into the temperature-control outer sleeve 2b in the whole experiment process of the sample conveying and static sounding calibration tank; after the experiment operation is finished and the sample storage stage is carried out, the circulation injection of the constant temperature fluid into the temperature control outer sleeve 2b can be stopped, and the ball valve module 3 filled with the sample 7 and the pressure maintaining sleeve 2a are placed in a low-temperature environment such as a low-temperature refrigeration house or a refrigerator.
Besides the static sounding tank checking experiment of the pressure maintaining sample, the low-temperature sample pressure maintaining cylinder can be matched with the ball valve module to realize the long-time preservation of the hydrate in-situ pressure maintaining sample;
the on-line detection device can be used in cooperation with the existing on-line detection device for the shipborne pressure maintaining rock core, and a sample transfer system of the on-line detection device for the shipborne pressure maintaining rock core can replace a sample conveying system in the invention.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. A static sounding calibration tank device for pressure maintaining sediment online detection is characterized by comprising:
the static sounding unit comprises a sample pressure maintaining cylinder (2a), the sample pressure maintaining cylinder is provided with a pressure maintaining cavity, the open end of the sample pressure maintaining cylinder is communicated with the pressure maintaining cavity, a static sounding probe (1) is fixedly mounted at the closed end of the sample pressure maintaining cylinder (2a), and the static sounding probe (1) extends into the pressure maintaining cavity;
the data acquisition system is used for acquiring the measurement data acquired by the static sounding probe (1) and storing the measurement data;
the sample conveying unit comprises a sample conveying pressure maintaining cylinder (4a), the sample conveying pressure maintaining cylinder (4a) comprises an accommodating cavity, the open end of the sample conveying pressure maintaining cylinder (4a) is communicated with the accommodating cavity, a sample conveying claw (4b) is arranged at the closed end of the sample conveying pressure maintaining cylinder (4a), and the sample conveying claw (4b) extends into the accommodating cavity;
the static sounding device also comprises a ball valve module (3), wherein the ball valve module (3) connects the static sounding unit and the sample conveying unit together and controls the on-off of the static sounding unit and the sample conveying unit; when ball valve module (3) were opened, sample transport claw (4b) can push sample (7) from holding the chamber and pressing to static sounding probe (1) in the pressure chamber of this pressure maintaining section of thick bamboo (2a), and at the in-process that pushes in, static sounding probe (1) is measured sample (7).
2. The static sounding calibration tank device for online detection of pressure maintaining deposits according to claim 1, further comprising:
and the pressure maintaining system is communicated with the pressure maintaining cavity of the static sounding unit and the accommodating cavity of the sample conveying unit through a first high-pressure valve and a second high-pressure valve respectively.
3. The static sounding calibration tank device for online detection of pressure maintaining deposits according to claim 1, further comprising:
and the low-temperature control unit maintains the temperature of the pressure maintaining cavity of the static sounding unit at a preset low-temperature value.
4. The static sounding calibration tank device for online detection of pressure maintaining deposits according to claim 1, wherein the low-temperature control unit comprises:
and the temperature control outer sleeve (2b) is wrapped outside the sample pressure maintaining cylinder (2a), and can realize temperature control in a mode of injecting constant-temperature fluid into the temperature control outer sleeve or in a semiconductor refrigeration mode.
5. The static sounding calibration tank device for online detection of pressure maintaining deposits according to claim 1, further comprising:
the static sounding probe (1) and the sample conveying claw (4b) are coaxially arranged.
6. A method for static sounding for online detection of pressure-maintaining deposits is characterized by comprising the following steps:
s1) sample conveyance process: firstly, the ball valve module is in a closed state, a sample (7) is sealed in a sample conveying pressure-maintaining cylinder (4a), and a pressure maintaining system is utilized to maintain the water pressure in the sample conveying pressure-maintaining cylinder (4 a); then, the other end of the ball valve module (3) is connected with a sample pressure maintaining cylinder (2a), the sample pressure maintaining cylinder (2a) is filled with water by using a pressure maintaining system, and the same pressure as that of the sample conveying pressure maintaining cylinder (4a) is kept; opening the ball valve module (3) to enable the sample pressure maintaining cylinder (2a) to be communicated with the sample conveying pressure maintaining cylinder (4a), and pushing the sample into the sample pressure maintaining cylinder (2a) by using the sample conveying claw (4 b);
s2) static cone penetration test procedure: starting the static sounding probe (1), enabling a sample (7) to move relative to the static sounding probe (1) under the pushing of the sample conveying claw (4b), enabling the static sounding probe (1) to gradually penetrate into the sample (7), and recording acquired measurement data by using a data acquisition system in the period;
s3) sample pressure holding storage process: when the sample (7) is conveyed to the innermost end of the sample pressure maintaining cylinder (2a), the ball valve module (3) is closed, the ball valve module (3) is separated from the sample conveying pressure maintaining cylinder (4a), and the connection between the sample pressure maintaining cylinder (2a) and the pressure maintaining system is disconnected.
7. The method for the static cone penetration of the online detection of the pressure maintaining deposits according to claim 6, further comprising the following steps:
s4) temperature control process: the temperature control outer sleeve (2b) is arranged on the periphery of the sample pressure maintaining cylinder (2a), and the low-temperature environment of the sample pressure maintaining cylinder (2a) is maintained in the whole sample conveying and static sounding experiment process.
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