CO2 multi-component mixed system flooding natural gas phase state characteristic visualization experiment device and method

Abstract

The invention discloses a CO2 multi-component mixed system flooding natural gas phase state characteristic visualization experiment device and method, and relates to the technical field of oil and gas development. The experimental kettle is connected with a carbon dioxide feeding pipeline, a methane feeding pipeline and other gas pipelines through a gas injection port in the bottom; a plurality of cameras are mounted on the outer side of the experiment kettle and are connected with a computer in a wireless manner; a plurality of detection probes are arranged in one side of the experiment kettle and penetrate through the experiment kettle to be connected with a gas detection analyzer; a plurality of heat exchange pipes are embedded in the inner wall of the experimental kettle; a plurality of heating rods penetrate through the experiment kettle from top to bottom; a temperature sensor I and a pressure meter I are arranged at the top of the experimental kettle. According to the invention, the mixing process of liquid or supercritical CO2 and CH4 and the condition of a mixing transition zone can be intuitively observed; and meanwhile, the distribution rule and the concentration change of CO2 and CH4 can be monitored in real time when CO2 displaces CH4 from a lower layer.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas development, and particularly to a visualization experimental device and method for the gas phase characteristics of natural gas driven by a CO2 multi-component mixed system. Background Art

[0002] CCS (Carbon Dioxide Capture and Storage) / CCUS (Carbon Dioxide Utilization and Storage) technology is the main technical option for realizing the low-carbon and zero-carbon utilization of fossil energy. CCUS-EOR (Enhanced Oil Recovery by Carbon Dioxide Injection) and CCUS-EGR (Enhanced Gas Recovery by Carbon Dioxide Injection) are the main ways to utilize carbon dioxide on a large scale and are also important research and development technologies for those skilled in the art. The gas reservoirs in the Sichuan Basin are rich in types and large in number, and most of the gas reservoirs are in the middle and late stages of development, so the CCS / CCUS technology has great potential. However, in the process of carbon dioxide injection into gas reservoirs, the process of carbon dioxide displacing methane, the characteristics of gas mixing, and the phase state characteristic changes of carbon dioxide / methane at different temperatures and pressures are not yet clear. It is necessary to carry out phase state characteristic experiments to clarify the enhanced recovery mechanism of CCUS-EGR, which will provide strong theoretical support for the stable production of old gas reservoirs, the improvement of recovery efficiency, and the maximization of the comprehensive benefits of gas reservoirs.

[0003] In the prior art, there are few experimental methods for studying the phase state characteristic changes of methane and carbon dioxide mixtures, and generally, they are detected by a PVT phase state instrument. However, due to the lack of professional experimental instruments, firstly, the process of mixing liquid or supercritical carbon dioxide and methane gas cannot be directly observed, or the experimental instrument is too small to observe the situation of the mixing transition zone of liquid or supercritical carbon dioxide and methane; secondly, when carbon dioxide displaces methane from the lower layer, the distribution law and concentration change of carbon dioxide and methane cannot be detected in real time. Summary of the Invention

[0004] The purpose of the present invention is to provide a visualization experimental device and method for the gas phase characteristics of natural gas driven by a CO2 multi-component mixed system, which can simulate the phase state characteristics of carbon dioxide displacing methane, can directly observe the process of mixing liquid or supercritical carbon dioxide and methane gas, and can also observe the situation of the mixing transition zone of liquid or supercritical carbon dioxide and methane; at the same time, it can also monitor in real time the distribution law and concentration change of carbon dioxide and methane when carbon dioxide displaces methane from the lower layer.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a visualization experimental device for the gas phase characteristics of natural gas driven by a CO2 multi-component mixed system, and the device includes a visualization experimental kettle;

[0007] The experimental kettle is connected to a carbon dioxide feed pipeline, a methane feed pipeline, and other gas pipelines through a gas injection port at the bottom;

[0008] A plurality of cameras are installed on the outer side of the experimental kettle, and the plurality of cameras are connected to a computer wirelessly;

[0009] A number of detection probes are built in one side of the experimental kettle, and the number of detection probes pass through the experimental kettle and are connected to a gas detection analyzer;

[0010] A plurality of heat exchange tubes are embedded on the inner wall of the experimental kettle;

[0011] A number of heating rods penetrate through the experimental kettle from top to bottom;

[0012] A temperature sensor I and a pressure gauge I are arranged at the top of the experimental kettle.

[0013] Further, the experimental kettle includes a columnar container, a visualization window is arranged on the side of the container, and the visualization window is made of sapphire material resistant to high temperature and high pressure.

[0014] Further, a gas injection port is arranged at the bottom of the experimental kettle, and the gas injection port includes a methane inlet (2.1), a carbon dioxide inlet and other gas inlets; wherein,

[0015] The methane inlet is connected to a methane feed pipeline;

[0016] The carbon dioxide inlet is connected to a carbon dioxide feed pipeline;

[0017] The other gas inlet is connected to other gas pipelines.

[0018] Further, the methane inlet is used to inject natural gas;

[0019] The carbon dioxide inlet is used to inject carbon dioxide;

[0020] The other gas inlet is used to inject other component gases; or is connected to a vacuum pump through pipeline II and is used to evacuate the whole device before the experiment; or is connected to a recovery device through pipeline I and is used to recover the fluid in the visualized experimental kettle after the experiment.

[0021] Further, a pressure gauge II is arranged on the carbon dioxide feed pipeline; a pressure gauge III is arranged on the methane feed pipeline; a pressure gauge IV is arranged on the other gas pipeline.

[0022] Further, the carbon dioxide feed pipeline, the methane feed pipeline and the other gas pipeline are respectively connected to one end of a high-temperature and high-pressure container filled with its respective gas, and the other end of the container is connected to a high-pressure injection pump through a pipeline, and the injection pump is used to control the pressure and speed of the injected gas.

[0023] Further, the gas detection analyzer is a gas chromatograph.

[0024] Further, the heat exchange tubes are used for the medium to flow through. One end of each heat exchange tube is the medium inlet, and the other end is the medium outlet;

[0025] The heating rod is used to heat up the gas in the experimental kettle, thereby controlling the phase state of the gas.

[0026] Further, the device further includes a computer, which is used to receive the gas component and concentration signals sent by the gas detection analyzer, the temperature signal sent by the temperature sensor I, the pressure signal detected by the pressure gauge I, and the image signal from the camera.

[0027] The present invention also provides a visualization experiment method for the gas phase state characteristics of CO2 multi-component mixed system flooding natural gas. The method includes the following steps:

[0028] Step a: Assemble the experimental device according to the aforementioned experimental device structure and check the airtightness of the experimental device;

[0029] Step b: Connect the vacuum pump to the experimental device through the spare valve, use the vacuum pump to evacuate for 24 hours, and then close the spare valve;

[0030] Step c: First inject natural gas from the gas injection port at the bottom of the experimental kettle, and then inject carbon dioxide. Observe the change of carbon dioxide as the pressure increases;

[0031] Step d: The detection probes installed in the experimental kettle detect the concentration of each component gas in real time and transmit it to the gas detection analyzer for analysis. The gas detection analyzer uploads the analysis results to the computer terminal; during the experiment, the camera monitors the change of the gas phase state characteristics in the visualization window in real time and transmits the image to the computer terminal in real time;

[0032] Step e: When the experiment is over, close the spare valve at the gas injection port end, connect the fluid recovery device through the spare valve, and evacuate and recover the gas in the experimental kettle.

[0033] The technical effects and advantages of the present invention:

[0034] First, for the experimental device of the present invention, on the one hand, it can directly observe the process of mixing liquid or supercritical carbon dioxide and methane gas, and can also observe the stratification of liquid or supercritical carbon dioxide and methane and the situation of the mixing transition zone. On the other hand, it can monitor in real time the distribution law and concentration change of carbon dioxide and methane when carbon dioxide displaces methane from the lower layer.

[0035] II. Regarding the distribution of gaseous and supercritical carbon dioxide and methane in the present invention, the concentration of the gas can be detected in real time by a gas detection analyzer such as a gas chromatograph externally connected to a probe or a detection device provided in the experimental kettle, so as to obtain the gas distribution information.

[0036] III. The experimental device of the present invention can study the experiment of carbon dioxide displacement of methane containing impurities. For example, the tail gas of a natural gas purification plant can be injected into a natural gas reservoir to improve the recovery rate. Therefore, this experimental device can provide a basis for studying the phase state characteristic changes of the carbon dioxide multi-component mixed system displacing natural gas.

[0037] IV. In the experimental kettle of the experimental device of the present invention, a heating rod and a heat exchange tube are provided, so that the fluid in the experimental kettle can be cooled or heated quickly and evenly, and the simulation effect is good. At the same time, a heat conduction medium or a cooling medium can be introduced into the heat exchange tube to realize the heating or cooling of the experimental kettle.

[0038] Other features and advantages of the present invention will be described in the subsequent specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a schematic structural diagram of an experimental device for visualizing the phase state characteristics of a CO2 multi-component mixed system displacing natural gas according to the present invention;

[0041] Figure 2 It is a schematic connection diagram of the experimental kettle of the present invention with a gas detection analyzer and a computer;

[0042] Figure 3 It is a schematic structural diagram of the experimental kettle of the present invention;

[0043] Reference numerals: 1, experimental autoclave; 2, gas injection port; 3, carbon dioxide feed pipeline; 4, methane feed pipeline; 5, camera; 6, detection probe; 7, gas detection analyzer; 8, heat exchange tube; 9, heating rod; 10, temperature sensor I; 11, pressure gauge I; 12, pipeline I; 13, recovery device; 14, pipeline II; 15, vacuum pump; 16, computer; 17, pressure gauge II; 18, pressure gauge III; 19, pressure gauge IV; 20, other gas pipeline; 21, injection pump; 1.1, container; 1.2, visualization window; 2.1, methane inlet; 2.2, carbon dioxide inlet; 2.3, other gas inlet; 8.1, medium inlet; 8.2, medium outlet. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] The present invention provides a visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas. Figure 1 It is a schematic structural diagram of a visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas of the present invention. Figure 2 It is a schematic connection diagram of the experimental autoclave of the present invention with the gas detection analyzer 7 and the computer 16. Figure 3 It is a schematic structural diagram of the experimental autoclave 1 of the present invention. Combining Figures 1-3 it can be seen that the experimental device includes a visual experimental autoclave 1. The experimental autoclave 1 includes a large vertical column-shaped container 1.1 about 1 m high. A visualization window 1.2 is provided on the side of the experimental autoclave 1. The visualization window 1.2 is made of sapphire material with high temperature and high pressure resistance, and the rest of the material of the container 1.1 is made of steel material with high temperature and high pressure resistance, so that the upper and lower stratification and the mixing situation in the transition zone during the displacement of methane by liquid or supercritical carbon dioxide can be clearly observed.

[0046] Preferably, there is a same visualization window 1.2 at the opposite place on the back of the container 1.1. During use, a white light-emitting board can be placed on the back of the experimental autoclave to illuminate the fluid in the experimental autoclave, so that the process of CO2 liquefaction and the process of transformation from liquid to subcritical state and supercritical state can be clearly observed.

[0047] Further, the experimental kettle 1 is connected to a carbon dioxide feed pipeline 3, a methane feed pipeline 4, and other gas pipelines 20 through a gas injection port 2 at the bottom. The gas injection port 2 includes a methane inlet 2.1, a carbon dioxide inlet 2.2, and other gas inlets 2.3. Among them, the methane inlet 2.1 is connected to the methane feed pipeline 4, the carbon dioxide inlet 2.2 is connected to the carbon dioxide feed pipeline 3, and the other gas inlets 2.3 are connected to the other gas pipelines 20.

[0048] Preferably, corresponding intake valves are provided on the methane inlet 2.1, carbon dioxide inlet 2.2, and other gas inlets 2.3 provided below the experimental kettle 1. Natural gas can be injected through the methane inlet 2.1, carbon dioxide can be injected through the carbon dioxide inlet 2.2, and other component gases can be injected through the other gas inlets 2.3. It can also be connected to a vacuum pump 15 through a pipeline II 14 to evacuate the entire device before the experiment. It can also be connected to a recovery device 13 through a pipeline I 12 to recover the fluid in the visible kettle after the experiment ends.

[0049] Further, pressure gauges II 17, III 18, and IV 19 are respectively provided on the carbon dioxide feed pipeline 3, methane feed pipeline 4, and other gas pipelines 20. The gas pressure in the pipelines can be monitored through the pressure gauges II 17, III 18, and IV 19, and the airtightness of the device can be judged assistively.

[0050] Further, the carbon dioxide feed pipeline 3, methane feed pipeline 4, and other gas pipelines 20 are respectively connected to one end of high-temperature and high-pressure containers filled with their respective gases. The other end of the containers is connected to a high-pressure injection pump 21 through pipelines. The pressure and speed of the injected gas can be controlled through the injection pump 21. Among them, the number of injection pumps 21 can be one or more. Specifically, multiple injection pumps 21 can be used to control the injection of gases in different containers, or only one injection pump 21 can be connected to different containers through a six-way valve. When it is necessary to inject the gas of a certain container, the six-way valve connected to that container is opened, and the six-way valves connected to other containers are closed.

[0051] Further, a plurality of high-definition cameras 5 are equipped outside the visualization window 1.2 of the experimental kettle 1. The cameras 5 are connected to a computer 16 wirelessly and upload images of the gas phase state characteristic changes to the computer 16 in real time.

[0052] Furthermore, several detection probes 6 for detecting gas components and concentrations are arranged on one side inside the experimental kettle 1. The detection probes 6 pass through the experimental kettle 1 and are connected to a gas detection analyzer 7. In this embodiment, the gas detection analyzer 7 is a gas chromatograph. The gas chromatograph can be used to detect physical properties of different gases such as the type, concentration, and density of the gas. In this experimental example, it can be used to monitor in real time the distribution, phase change state, and mixing state of carbon dioxide and other gases under different temperature and pressure conditions. The measurement data is processed by a computer to generate a cloud map, so that the distribution of different gases can be visualized and quantified; the gas detection analyzer 7 is further connected to the computer 16 to transmit the gas component and concentration distribution at different positions to the computer 16 in real time.

[0053] Preferably, for the convenience of observation from the visualization window 1.2 of the experimental kettle 1, except for the top, bottom of the experimental kettle 1, and the side where the visualization window 1.2 is located where the detection probes 6 cannot be installed, the detection probes 6 can be installed on other sides.

[0054] Furthermore, two high-temperature and high-pressure resistant heat exchange tubes 8 are embedded on the inner wall of the experimental kettle 1. A coolant flows through the heat exchange tubes 8. Each heat exchange tube 8 is used for circulating a medium. One end of each heat exchange tube 8 is a medium inlet 8.1, and the other end is a medium outlet 8.2. Specifically, a coolant such as liquid nitrogen can be introduced into the medium inlet 8.1 of the heat exchange tube 8 to cool the fluid inside the experimental kettle 1. The coolant after heat exchange is then discharged from the medium outlet 8.2, making carbon dioxide become liquid, so that the phase characteristics of the gas under low-temperature conditions can be studied. Of course, a heat-conducting medium with a higher temperature can also be introduced into the heat exchange tube 8 to heat the fluid in the experimental kettle 1. In this embodiment, the heating / cooling speed of the fluid is fast and uniform, the simulation effect is better, and the simulation result is closer to the actual situation.

[0055] Furthermore, several heating rods 9 penetrate through the experimental kettle 1 from top to bottom. The several heating rods 9 are evenly distributed on both sides of the experimental kettle 1. The gas in the experimental kettle 1 can be heated and raised in temperature through the heating rods 9, thereby controlling the phase state of the gas. For example, to make carbon dioxide in a gaseous state or a supercritical state. Generally, when the temperature is higher than 32 °C, the change of pressure is controlled. As the pressure increases, when the pressure is higher than 7.3 MPa, carbon dioxide will change from a gaseous state to a supercritical state.

[0056] Preferably, for the convenience of observation from the visualization window 1.2 of the experimental kettle 1, the heating rods 9 are usually installed on the side inside the experimental kettle 1 close to the heat exchange tubes 8.

[0057] Furthermore, a temperature sensor Ⅰ10 and a pressure gauge Ⅰ11 are also provided on the top of the experimental kettle 1, and the pressure gauge Ⅰ11 can monitor the pressure change inside the experimental kettle 1 in real time. As for the distribution of gaseous and supercritical carbon dioxide and methane, the detection probe 6 provided in the experimental kettle 1 can be connected to an external gas chromatograph to detect the concentration of the gas in real time and obtain the distribution of the gas.

[0058] Furthermore, the experimental device in this embodiment also includes a computer 16, which is used to receive gas composition and concentration signals emitted by the gas detection analyzer 7, to receive temperature signals emitted by the temperature sensor Ⅰ10, to receive pressure signals detected by the pressure gauge Ⅰ11, and to receive image signals from the camera 5.

[0059] Based on the above experimental device, the present invention also provides a method for visualizing the phase characteristics of natural gas in a CO2 multi-component mixed system, comprising the following steps:

[0060] Step a, assembling the experimental device according to the aforementioned experimental device structure, and checking the sealing of the experimental device;

[0061] Step b, connect the vacuum pump 15 to the experimental device through the spare valve, use the vacuum pump 15 to evacuate for 24 hours, and then close the spare valve;

[0062] Step c, first inject a certain amount of natural gas from the methane inlet 2.1 at the bottom of the experimental kettle 1 through the injection pump 21, and then slowly inject carbon dioxide through the carbon dioxide inlet 2.2, and observe the change of carbon dioxide as the pressure increases;

[0063] Step d, the detection probe 6 installed in the experimental kettle 1 detects the concentration of each component gas in real time and transmits it to the gas detection analyzer 7 for analysis, and the gas detection analyzer 7 uploads the analysis result to the computer 16 terminal; during the experiment, the camera 5 monitors the changes in the gas phase characteristics in the visualization window 1.2 in real time, and transmits the image to the computer 16 terminal in real time;

[0064] Step e: After the experiment is finished, close the spare valve at the gas injection port 2, connect the fluid recovery device through the spare valve, and vent and recover the gas in the experimental kettle 1.

[0065] Of course, the experimental device in the present invention can also be used in experiments to study the displacement of methane by impure carbon dioxide, such as injecting tail gas from a natural gas purification plant into a natural gas reservoir to improve the recovery rate. Therefore, this experimental device can provide a basis for studying the changes in phase characteristics of natural gas displaced by a carbon dioxide multi-component mixed system.

[0066] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas, characterized in that, The device includes a visual experimental kettle (1); The experimental kettle (1) is connected to a carbon dioxide feed pipeline (3), a methane feed pipeline (4), and other gas pipelines (20) through a gas injection port (2) at the bottom; A plurality of cameras (5) are installed outside the experimental kettle (1), and the plurality of cameras (5) are wirelessly connected to a computer (16); A number of detection probes (6) are built into one side of the experimental kettle (1), and the number of detection probes (6) pass through the experimental kettle (1) and are connected to a gas detection analyzer (7); A plurality of heat exchange tubes (8) are inlaid on the inner wall of the experimental kettle (1); A number of heating rods (9) penetrate through the experimental kettle (1) from top to bottom; A temperature sensor I (10) and a pressure gauge I (11) are provided at the top of the experimental kettle (1).

2. The visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas according to claim 1, characterized in that The experimental kettle (1) includes a columnar container (1.1), a visual window (1.2) is provided on the side of the container (1.1), and the visual window (1.2) is made of a sapphire material resistant to high temperature and high pressure.

3. A visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas according to claim 1 or 2, characterized in that, A gas injection port (2) is provided at the bottom of the experimental kettle (1), and the gas injection port (2) includes a methane inlet (2.1), a carbon dioxide inlet (2.2), and other gas inlets (2.3); among them, The methane inlet (2.1) is connected to the methane feed pipeline (4); The carbon dioxide inlet (2.2) is connected to the carbon dioxide feed pipeline (3); The other gas inlet (2.3) is connected to other gas pipelines (20).

4. A visual experimental device for the gas phase characteristics of natural gas displaced by a CO2 multi-component mixed system according to claim 3, characterized in that The methane inlet (2.1) is used to inject natural gas; The carbon dioxide inlet (2.2) is used to inject carbon dioxide; The other gas inlet (2.3) is used to inject other component gases; or is connected to a vacuum pump (15) through a pipeline II (14) and is used to evacuate the entire device before the experiment; or is connected to a recovery device (13) through a pipeline I (12) and is used to recover the fluid in the visual experimental kettle (1) after the experiment.

5. The visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas according to claim 3, wherein A pressure gauge II (17) is provided on the carbon dioxide feed pipeline (3); a pressure gauge III (18) is provided on the methane feed pipeline (4); a pressure gauge IV (19) is provided on the other gas pipeline (20).

6. The visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas according to claim 4, wherein, The carbon dioxide feed pipeline (3), the methane feed pipeline (4), and the other gas pipeline (20) are respectively connected to one end of a high-temperature and high-pressure container filled with their respective gases, and the other end of the container is connected to a high-pressure injection pump (21) through a pipeline, and the injection pump (21) is used to control the pressure and speed of the injected gas.

7. The visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas according to claim 2, characterized in that, The gas detection analyzer (7) is a gas chromatograph.

8. A visual experimental device for the gas phase characteristics of natural gas displaced by a CO2 multi-component mixed system according to claim 2, characterized in that The heat exchange tube (8) is used for circulating a medium, and one end of each heat exchange tube (8) is a medium inlet (8.1) and the other end is a medium outlet (8.2); The heating rod (9) is used to heat up the gas in the experimental kettle (1), thereby controlling the phase state of the gas.

9. The visualization experimental device for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas according to claim 1, wherein The device further includes a computer (16), which is used to receive the gas component and concentration signals sent by the gas detection and analyzer (7), the temperature signal sent by the temperature sensor I (10), the pressure signal detected by the pressure gauge I (11), and the image signal from the camera (5).

10. A visualization experimental method for the gas phase characteristics of CO2 multi-component mixed system flooding natural gas, the method uses the device described in claims 1-9, and is characterized in that, The method includes the following steps: Step a: Assemble the experimental device according to the structure of the aforementioned experimental device and check the airtightness of the experimental device; Step b: Connect the vacuum pump (15) to the experimental device through the spare valve, use the vacuum pump (15) to evacuate for 24 hours, and then close the spare valve; Step c: First inject natural gas from the gas injection port (2) at the bottom of the experimental kettle (1), and then inject carbon dioxide. Observe the change of carbon dioxide as the pressure increases; Step d: The detection probe (6) installed in the experimental kettle (1) detects the concentration of each component gas in real time and transmits it to the gas detection and analyzer (7) for analysis. The gas detection and analyzer (7) uploads the analysis result to the computer (16) terminal; during the experiment, the camera (5) monitors the change of the gas phase state characteristics in the visualization window (1.2) in real time and transmits the image to the computer (16) terminal in real time; Step e: At the end of the experiment, close the spare valve at the gas injection port (2) end, connect the fluid recovery device through the spare valve, and evacuate and recover the gas in the experimental kettle (1).

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