In-situ sampling device during corrosion experiment in supercritical CO2 wet gas environment

Abstract

The present invention relates to the technical field of oil and gas field exploitation engineering, and discloses an in-situ sampling device in a supercritical CO2 wet gas environment corrosion experiment process, comprising a high-pressure reactor, a high-pressure magnetically driven ball valve and a high-pressure sampling reactor connected in sequence, the high-pressure reactor is used to simulate the supercritical CO2 wet gas environment conditions, and a detachable sample fixture is provided at the bottom; a sample is arranged on the sample fixture; a high-pressure magnetically driven ball valve is used to connect or isolate the high-pressure reactor and the high-pressure sampling reactor; the high-pressure sampling reactor is used to take the sample fixture from the high-pressure reactor to the high-pressure sampling reactor. The in-situ sampling device provided by the present invention uses a high-pressure magnetically driven ball valve to separate the reaction device from the sampling device, so that the corrosion simulation test and the sampling operation can be carried out simultaneously, the sampling process does not affect the stability of the reaction system, and avoids the influence of multiple pressure reduction and discharge during the long-period experiment on the corrosion process of the experimental sample.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field mining engineering, and in particular to an in-situ sampling device in a supercritical CO2 wet gas environment corrosion experiment process. Background Art

[0002] With humanity's growing demand for fossil energy, the issue of global climate change caused by CO2 emissions is becoming increasingly prominent. Currently, Carbon Capture, Utilization, and Storage (CCUS) technology has been widely recognized for its effectiveness in reducing emissions. However, the captured supercritical CO2 fluid often carries trace amounts of corrosive impurities (such as H2O, O2, H2S, SO2, NO2, etc.), which seriously threatens the service safety of transmission pipelines and has become a bottleneck restricting the safe implementation of CCUS technology.

[0003] Unlike the traditional oil and gas field water medium corrosion environment, the supercritical CO2 transmission pipeline is a humid environment, and the pipeline steel mainly corrodes under the thin liquid film. The corrosion process is mainly affected by the water phase deposition characteristics and trace impurities.

[0004] Currently, existing studies on supercritical CO2 corrosion often use traditional autoclaves for simulation experiments. During the experiment, the specimens and the corrosive medium are kept in the same high-pressure, sealed environment. Removing the specimens requires pressure relief. While relief allows for timely specimen removal, it causes dramatic fluctuations in the CO2 phase within the autoclave, altering the distribution of water and impurity components in the system, severely impacting the accuracy of the corrosion experiment. Furthermore, removing some specimens after relief inevitably introduces air back into the autoclave. During the re-deoxygenation process, the residual O2 within the autoclave influences the composition of corrosion products on the surfaces of the remaining specimens, impacting the reliability of the experimental results. This is particularly true during long-term experiments, where multiple pressure relief operations are required to remove specimens at various time points, compromising the accuracy of the experimental results. Furthermore, supplementing these experiments with multiple cycles of off-site testing increases the workload and reduces the consistency and continuity of the results due to operational errors between multiple off-site experiments. Therefore, conducting long-term corrosion experiments using traditional autoclaves significantly impacts the accuracy of the results, making it impossible to accurately capture the corrosion evolution patterns of pipelines.

[0005] Therefore, the above issues need to be fully considered when designing a corrosion simulation experimental device in a supercritical CO2 wet environment. Summary of the Invention

[0006] To overcome or alleviate one or more of the above technical problems, the present invention provides an in-situ sampling device for corrosion experiments in a supercritical CO₂ wet atmosphere. This device allows for the removal of experimental samples at any time while ensuring the stability of the reaction system containing the remaining sample. This device addresses the inability of traditional autoclave experiments to extract samples in a timely manner while maintaining the stability of the supercritical CO₂ wet atmosphere. This device ensures experimental accuracy and reduces the total duration of simulation experiments.

[0007] The present invention provides the following technical solutions:

[0008] The invention discloses an in-situ sampling device for a supercritical CO2 wet gas environment corrosion experiment, comprising a high-pressure reactor (100), a high-pressure magnetically driven ball valve (200) and a high-pressure sampling reactor (300) connected in sequence, wherein the high-pressure reactor (100) is used to carry supercritical CO2 fluid and other impurities to simulate supercritical CO2 wet gas environment conditions, and a detachable sample fixture (105) is provided at the bottom thereof; a sample is provided on the sample fixture (105); the high-pressure magnetically driven ball valve (200) is used to connect or isolate the high-pressure reactor (100) and the high-pressure sampling reactor (300); and the high-pressure sampling reactor (300) is used to take the sample fixture (105) from the high-pressure reactor (100) into the high-pressure sampling reactor (300).

[0009] According to some embodiments, the high-pressure reactor (100) includes a first reactor body (101), the first reactor body (101) is sealed by a first reactor cover (102) above the first reactor body (101), and the first reactor body (101) is provided with an opening on one side, and the opening is used to connect the high-pressure magnetically driven valve (200);

[0010] A rotating shaft (104) is provided at the bottom of the first kettle body (101), the rotating shaft (104) is driven by a first magnetic drive motor (106), and the rotating shaft (104) is connected to the sample holder (105);

[0011] The first heater (103) is arranged in the first kettle body (101), and the first kettle cover (102) is provided with a first air inlet (108), a first air outlet (109), a first pressure gauge (110) and a first thermometer (111).

[0012] According to some embodiments, the sample holder (105) includes a conical movable plug (1051), a mounting block (1052) is provided at the rear end of the movable plug (1051), hanging shafts (1053) for hanging the sample are provided on both sides of the mounting block (1052), and the rear end of the mounting block (1052) is fixed on the mounting column (1054); a tray (112) is provided at the top of the rotating shaft (104), and a plurality of through grooves are opened on the outer side of the upper ring of the tray (112), and the through grooves are used to install the mounting column (1054), and the tray (112) is driven to rotate by the rotating shaft (104).

[0013] According to some embodiments, the high-pressure sampling kettle (300) includes a third kettle body (302), the third kettle body (302) is an inverted T-shaped opening, one end of the straight passage is sealed and connected to the high-pressure magnetically driven ball valve (200), and the other end of the straight passage is sealed and provided with a third magnetically driven motor (301) on the outside, the third magnetically driven motor (301) drives a push rod (304) located in the straight passage of the third kettle body (302) from the high-pressure reaction kettle (100), through the high-pressure magnetically driven ball valve (200), to the high-pressure sampling kettle (300) for free telescopic movement, and a sampling clamp (307) is fixed at the end of the push rod (304);

[0014] The bypass side outlet of the third kettle body (302) is provided with a third kettle cover (303), and the third kettle cover (303) is provided with a third heater (305), a third thermometer (311), a third pressure gauge (310), a third air inlet (308) and a third air outlet (309).

[0015] According to some embodiments, the sampling clamp (307) includes a clamp housing (3071), and a spring (3072) is provided inside the clamp housing (3071) between a slider latch base (3074) and a spring stopper (3075). When the spring (3072) is extended or retracted, the two slider latches (3073) close inward to clamp the movable plug (1051), thereby removing the sample clamp (105) with the sample from the tray (112).

[0016] According to some embodiments, the high-pressure magnetically driven ball valve (200) includes a valve body (202), a valve core (203) is provided in the valve body (202), the inlet and outlet of the valve body (202) are respectively sealed and connected to the high-pressure reactor (100) and the high-pressure sampling reactor (300), and the second magnetically driven motor (201) is used to drive the valve core (203) to rotate, thereby controlling the on and off of the high-pressure magnetically driven ball valve (200).

[0017] According to some embodiments, the high-pressure reactor (100), the high-pressure magnetically driven ball valve (200) and the high-pressure sampling reactor (300) are all tightly connected via flanges.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The in-situ sampling device provided by the present invention for use in a supercritical CO2 wet gas environment corrosion experiment uses a high-pressure magnetically driven ball valve to separate the reaction device from the sampling device, thereby enabling corrosion simulation tests and sampling operations to be performed simultaneously. The sampling process does not affect the stability of the reaction system, thereby avoiding the influence of multiple pressure reductions and discharges on the corrosion process of the experimental sample during long-period experiments.

[0020] The present invention is easy to operate and can effectively reduce the total working time of a traditional high-pressure autoclave long-cycle experiment.

[0021] The present invention is applicable to material corrosion experiments and real-time sampling in high-pressure wet environments including supercritical CO2 transportation environments, and can also be used for research on the corrosion mechanism of pipeline steel in supercritical CO2 wet environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the in-situ sampling device during the supercritical CO2 wet gas environment corrosion experiment provided by an embodiment of the present invention.

[0023] Figure 2 A schematic diagram of a high-pressure reactor provided in an embodiment of the present invention.

[0024] Figure 3 The three-dimensional diagram and three-dimensional diagram of the movable plug provided by the embodiment of the present invention.

[0025] Figure 4 Detailed diagram of the sample fixture assembly provided in an embodiment of the present invention.

[0026] Figure 5 A high-pressure magnetically driven ball valve is provided in an embodiment of the present invention.

[0027] Figure 6 A high-pressure sampling kettle device is provided in an embodiment of the present invention.

[0028] Figure 7 This is a connection diagram between the sampling fixture and the movable plug provided in an embodiment of the present invention.

[0029] In the figure: a high-pressure reactor 100; a first reactor body 101; a first reactor cover 102; a first heater 103; a rotating shaft 104; a sample holder 105; a movable plug 1051; a mounting block 1052; a hanging shaft 1053; a mounting column 1054; a first magnetic drive motor 106; a first flange 107; a first air inlet 108; a first air outlet 109; a first pressure gauge 110; a first thermometer 111; and a tray 112.

[0030] High-pressure magnetically driven ball valve 200; second magnetically driven motor 201; valve body 202; valve core 203; gasket 204; second flange 205;

[0031] High-pressure sampling kettle 300; third magnetic drive motor 301; third kettle body 302; third kettle cover 303; push rod 304; third heater 305; third flange 306; sampling fixture 307; fixture housing 3071; spring 3072; slider latch 3073; slider latch base 3074; spring stop 3075; third air inlet 308; third air outlet 309; third pressure gauge 310; third thermometer 311. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the embodiments and accompanying drawings. However, it should be understood that the embodiments and accompanying drawings are merely exemplary descriptions of the present invention and do not constitute any limitation on the scope of protection of the present invention. All reasonable variations and combinations within the scope of the inventive concept of the present invention fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "disposed", "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, or they can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Example 1

[0036] (1) Construction description

[0037] like Figure 1 The in-situ sampling device provided in the supercritical CO2 wet environment corrosion experiment process of this embodiment includes a high-pressure reactor 100, a high-pressure magnetically driven ball valve 200 and a high-pressure sampling reactor 300 connected in sequence.

[0038] in:

[0039] The autoclave 100 is used to carry supercritical CO2 fluid and other impurities to simulate the supercritical CO2 wet environment. The bottom of the autoclave is equipped with a magnetic drive motor to rotate the sample holder 105, on which the sample is placed.

[0040] The high-pressure magnetically driven ball valve 200 is used to connect or isolate the high-pressure reaction kettle and the high-pressure sampling kettle.

[0041] The high-pressure sampling kettle 300 is used to take out the experimental samples in each cycle and is equipped with a magnetic drive motor push rod, which can take the corresponding sample holder 105 from the high-pressure reaction kettle to the high-pressure sampling kettle.

[0042] The main connection relationships between the various parts are as follows:

[0043] like Figures 1-2 As shown, a first magnetic drive motor 106 is installed at the bottom of the autoclave 100 to drive the rotation of the rotating shaft 104 within the autoclave 100. A sample holder 105 is placed at the top of the rotating shaft 104 and rotates with the rotating shaft 104. The right side of the autoclave 100 is connected to a magnetically driven ball valve 200 via a flange. A second magnetic drive motor 201 is installed at the top of the magnetically driven ball valve 200, which drives the valve core 203 to rotate, opening and closing the ball valve. The right side of the magnetically driven ball valve 200 is connected to a high-pressure sampling autoclave 300 via a flange. A retractable sampling push rod 304 is installed on the right side of the autoclave 300. A sampling holder 307 is installed at the front end of the push rod 304 to secure the sample holder 105. A third magnetic drive motor 301 is connected to the outside of the flange on the right side of the autoclave 300. This third magnetic drive motor 301 drives the sampling holder 307 to remove the sample holder 105 and the sample. The above-mentioned assembly relationship is used to ensure that the device is well sealed. The high-pressure reactor 100 does not need to be depressurized, and sampling can be flexibly performed while ensuring that no air leakage occurs during the high-pressure experiment.

[0044] The details of each part are as follows:

[0045] like Figure 2As shown, a high-pressure reactor 100 is used to conduct corrosion simulation experiments while ensuring that the sample being sampled is rotated to face the sampling channel at a set time. The high-pressure reactor 100 primarily includes a first reactor cover 102, a first reactor body 101, a first heater 103, a sample holder 105, a rotating shaft 104, a first magnetic drive motor 106, a first flange 107, a first air inlet 108, a first air outlet 109, a first pressure gauge 110, and a first thermometer 111.

[0046] The first reactor body 101 opens upward and is sealed with a first lid 102. The first reactor body 101 has an opening to the right, which is equipped with a first flange 107. A first heater 103 is located within the sidewall of the first reactor body 101. The lid 102 is equipped with a first air inlet 108, a first air outlet 109, a first pressure gauge 110, and a first thermometer 111. The first heater 103 is used to heat the gas within the first reactor body 101 to the set experimental temperature and maintain it. The sample holder 105 is mounted on a tray 112 on the rotating shaft 104 at the bottom inner side of the first reactor body 101 and rotates with the rotating shaft 104. A first magnetically driven motor 106 is used to provide rotational power to the rotating shaft 104. The first flange 107 connects the first magnetically driven ball valve 200 to the high-pressure reactor 100. The first air inlet and outlet are used to introduce and remove impurities and CO2 required for the experiment. The first pressure gauge 110 and the first thermometer 111 are used to monitor the pressure and temperature in the reactor. Through the above-mentioned functional relationship, the corrosion experiment simulation is realized.

[0047] like Figures 3-4 The sample holder 105 includes a tapered movable plug 1051, a mounting block 1052 is provided at the rear end of the movable plug 1051, and hanging shafts 1053 for hanging the sample are provided on both sides of the mounting block 1052. The rear end of the mounting block 1052 is fixed to the mounting column 1054. A tray 112 is provided at the top of the rotating shaft, and eight rectangular through-slots are symmetrically opened in the annular area above the tray 112 for mounting the mounting column 1054. The square shaft at the bottom of the tray 112 is used to fit into the square groove of the rotating shaft 104 of the first magnetic drive motor 106, ensuring that the tray 112 can rotate synchronously with the rotating shaft 104, thereby realizing the rotation of the sample to the sampling position during each sampling cycle. All parts of the sample holder 105 are made of polytetrafluoroethylene.

[0048] The specific installation process is as follows:

[0049] First, the processed sample is mounted on the two hanging shafts on the rear side of the movable plug 1051 and secured. Next, the movable plug 1051 with the sample mounted is sequentially inserted into the rectangular slots of the tray 1052. Finally, the tray with the sample and movable plug 1051 mounted is mounted on the rotating shaft 104.

[0050] like Figure 5As shown, a high-pressure magnetically driven ball valve 200 connects the left and right autoclave bodies, shutting off or connecting the high-pressure gas inside them. It comprises a valve body 202, within which a valve core 203 is located. The inlet and outlet of valve body 202 are connected by a second flange 205, which is fitted with a gasket 204 for sealing. A second magnetically driven motor 201 is located above valve body 202.

[0051] The second flange 205 connects the high-pressure reactor 100 and the high-pressure sampling reactor 300 and is equipped with fastening bolts to ensure airtightness. The second magnetic drive motor 201 provides rotational power for the valve core 203, ensuring that the valve core 203 can shut off or connect the high-pressure fluid in the two reactors under high pressure. All components within the valve body 202 that come into contact with high-pressure corrosive gases must be made of corrosion-resistant materials.

[0052] like Figure 6 As shown, the high-pressure sampling kettle 300 is used to operate and remove experimental samples. It includes a third kettle body 302, a third kettle cover 303, a third pressure gauge 310, a third heater 305, a third thermometer 311, a third pressure gauge 310, a third air inlet 308, a third air outlet 309, a third magnetic drive motor 301, a push rod 304, a third flange 306, and a sampling fixture 307. The third kettle body 302 has an inverted T-shaped opening. The left end of the straight-through opening is connected to the high-pressure magnetic drive ball valve 200 through the third flange 306, and the right end is connected to the third magnetic drive motor 301 through the third flange 306. The third kettle cover 303 is provided at the side outlet. The third kettle cover 303 is equipped with a third heater 305, a third thermometer 311, a third pressure gauge 310, a third air inlet 308, and a third air outlet 309.

[0053] The third heater 305 is used to heat the gas in the kettle to the experimental set temperature and maintain it.

[0054] The sampling fixture 307 is used to hold the movable plug 1051 of the sample holder. It is mounted on the push rod 304 and reciprocates with the push rod 304, allowing the sample to be removed from the movable plug 1051 in a timely manner. The third magnetic drive motor 301 provides reciprocating power for the push rod 304. The third flanges 205 on both sides connect the high-pressure magnetic drive ball valve 200 and the third magnetic drive motor 301. The third inlet and outlet are used to introduce and remove impurities and high-pressure CO2 required for the experiment. The third pressure gauge 310 and third thermometer 311 are used to monitor the pressure and temperature within the reactor and must be made of corrosion-resistant materials.

[0055] Figure 7 FIG. 1 shows the connection relationship between the sampling clamp 307 and the movable plug 1051. Figure 3 .a is a front view of the sample holder 105, Figure 3 .b is a side view, Figure 3 .c is the top view, Figure 3 .d is a three-dimensional view. The sampling clamp 307 includes a clamp housing 3071, a spring 3072, a slider latch 3073, a slider latch base 3074, and a spring stop 3075. Within the clamp housing 3071, a spring 3072 is located between the slider latch base 3074 and the spring stop 3075. The spring 3072 expands and contracts, causing the two slider latches 3073 to close inward and engage the movable plug 1051.

[0056] The slider latch 3071 of the sampling fixture 307 is locked to the movable plug 1051 via a spring 3072, thereby connecting the sampling fixture 307 to the movable plug 1051. During sampling, pulling the push rod 304 drives the sampling fixture 307 to remove the sample from the corresponding movable plug 1051 into the high-pressure sampling vessel 300. The fixture housing 3071, slider latch 3073, slider latch base 3074, and spring stop 3075 are all made of polytetrafluoroethylene, and the spring must be made of corrosion-resistant material.

[0057] (2) The operation method of the in-situ sampling device during the supercritical CO2 wet environment corrosion experiment is as follows:

[0058] (1) Connect the various experimental devices using gas pipelines, install the sample fixture 105 and the sampling fixture 307 on the rotating shaft 104 in the high-pressure reactor 100 and the push rod 304 of the high-pressure sampling reactor 300, respectively, close the high-pressure reactor and the high-pressure sampling reactor 300, start the high-pressure magnetic drive ball valve 200 and keep the two autoclaves in a connected state.

[0059] (2) Open the first air inlet 108 of the autoclave 100, while keeping the first air outlet 109 closed. Open the third air outlet 309 of the autoclave 300, while keeping the third air inlet 308 closed. Use high-purity dry CO2 to remove air and moisture from the apparatus. The deoxygenation time is 2 hours.

[0060] (3) After deoxygenation is completed, all air inlets and outlets are closed, and the first heater 103 and the third heater 305 are adjusted to raise the temperature of the high-pressure reactor 100 and the high-pressure sampling reactor 300 to the set temperature.

[0061] (4) After the temperature reaches the set value, gas is added to the high-pressure reactor 100 and the high-pressure sampling reactor 300 to the experimental pressure according to the experimental parameter requirements.

[0062] (5) After the sampling period is reached, the first magnetic drive motor 106 of the autoclave 100 is started to drive the rotating shaft 104 and the sample holder 105 to align the sample to be taken out with the right channel opening of the autoclave. Then, the third magnetic drive motor 301 is started to push the push rod 304 to send the sampling holder 307 into the autoclave 100.

[0063] (6) After the sampling fixture 307 is connected and locked to the movable plug 1051, the push rod 304 is retracted into the high-pressure sampling kettle 300. Then, the high-pressure magnetically driven ball valve 200 is closed, disconnecting the high-pressure sampling kettle 300 from the high-pressure reactor 100. The fluid in the sampling kettle is drained and the sample is removed.

[0064] (7) After taking out the samples of the corresponding cycle, the high-pressure sampling kettle 300 is closed again and deoxygenated. Then, supercritical CO2 fluid with the same conditions as the high-pressure reaction kettle 100 is added to the kettle, and the high-pressure magnetically driven ball valve 200 is opened to keep the two autoclaves connected.

[0065] (8) Repeat steps (5) to (7) when sampling again until the corrosion experiment is completed.

[0066] The above embodiments are merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of protection of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that can be made by a person skilled in the art without departing from the principles of the present invention are also considered to be within the scope of protection of the present invention.

Claims

1. An in-situ sampling device for a supercritical CO2 wet environment corrosion experiment, comprising a high-pressure reaction kettle (100), a high-pressure magnetically driven ball valve (200) and a high-pressure sampling kettle (300) connected in sequence; A high-pressure reactor (100) is used to carry supercritical CO2 fluid and other impurities to simulate supercritical CO2 wet gas environment conditions, and a detachable sample fixture (105) is provided at the bottom thereof; a sample is arranged on the sample fixture (105); A high-pressure magnetically driven ball valve (200) for connecting or isolating the high-pressure reaction kettle (100) and the high-pressure sampling kettle (300); A high-pressure sampling kettle (300), used for taking the sample fixture (105) from the high-pressure reaction kettle (100) into the high-pressure sampling kettle (300); The high-pressure reactor (100) comprises a first reactor body (101), the first reactor body (101) is sealed by a first reactor cover (102) above the first reactor body (101), and the first reactor body (101) is provided with an opening on one side, and the opening is used to connect the high-pressure magnetically driven valve (200); A rotating shaft (104) is provided at the bottom of the first kettle body (101), the rotating shaft (104) is driven by a first magnetic drive motor (106), and the rotating shaft (104) is connected to the sample fixture (105); The first heater (103) is arranged in the first kettle body (101); the first kettle cover (102) is provided with a first air inlet (108), a first air outlet (109), a first pressure gauge (110) and a first thermometer (111); The high-pressure sampling kettle (300) comprises a third kettle body (302), the third kettle body (302) is an inverted T-shaped opening, one end of the straight passage is sealed and connected to the high-pressure magnetically driven ball valve (200), and the other end of the straight passage is sealed and provided with a third magnetically driven motor (301) on the outer side, the third magnetically driven motor (301) drives a push rod (304) located in the straight passage of the third kettle body (302) from the high-pressure reaction kettle (100), through the high-pressure magnetically driven ball valve (200), to the high-pressure sampling kettle (300) to freely move in a telescopic manner, and a sampling fixture (307) is fixedly provided at the end of the push rod (304); The bypass side outlet of the third kettle body (302) is provided with a third kettle cover (303), and the third kettle cover (303) is provided with a third heater (305), a third thermometer (311), a third pressure gauge (310), a third air inlet (308) and a third air outlet (309).

2. The in-situ sampling device in the supercritical CO2 wet gas environment corrosion experiment process according to claim 1, characterized in that: The sample fixture (105) comprises a conical movable plug (1051), a mounting block (1052) is provided at the rear end of the movable plug (1051), hanging shafts (1053) for hanging the sample are provided on both sides of the mounting block (1052), and the rear end of the mounting block (1052) is fixed on the mounting column (1054); a tray (112) is provided at the top end of the rotating shaft (104), a plurality of through grooves are opened on the outer side of the upper annular portion of the tray (112), and the through grooves are used to install the mounting column (1054), and the tray (112) is driven to rotate by the rotating shaft (104).

3. The in-situ sampling device in the supercritical CO2 wet gas environment corrosion experiment process according to claim 2, characterized in that: The sampling fixture (307) includes a fixture housing (3071), in which a spring (3072) is provided between a slider pin base (3074) and a spring stopper (3075). When the spring (3072) is extended or retracted, two slider pins (3073) are closed inward to clamp the movable plug (1051), thereby removing the sample fixture (105) with the sample from the tray (112).

4. The in-situ sampling device in the supercritical CO2 wet gas environment corrosion experiment process according to claim 1, characterized in that: The high-pressure magnetically driven ball valve (200) comprises a valve body (202), a valve core (203) is arranged in the valve body (202), the inlet and outlet of the valve body (202) are respectively sealed and connected to the high-pressure reaction kettle (100) and the high-pressure sampling kettle (300), and the top of the high-pressure magnetically driven ball valve (200) is equipped with a second magnetically driven motor (201), and the second magnetically driven motor (201) is used to drive the valve core (203) to rotate, so as to control the on and off of the high-pressure magnetically driven ball valve (200).

5. The in-situ sampling device in the supercritical CO2 wet gas environment corrosion experiment process according to any one of claims 1 to 4, characterized in that: The high-pressure reaction kettle (100), the high-pressure magnetically driven ball valve (200) and the high-pressure sampling kettle (300) are all tightly connected via flanges.

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