A sampler and combustion chamber physical simulation device

Abstract

This invention discloses a sampler and a physical simulation device for burning oil layers, belonging to the field of oil layer sampling technology. It is suitable for sampling oil, gas, and water from different areas within a physical simulation device for burning oil layers. The sampler includes a sampling cylinder and a stopper rod. The sampling cylinder has a sampling chamber arranged axially, with an opening at one axial end. The sampling cylinder also has a sampling hole arranged radially, with the sampling hole operably communicating with the bottom of the sampling chamber. One end of the stopper rod is slidably and sealingly inserted into the sampling chamber along the length of the sampling cylinder, while the other end is located outside the sampling cylinder. The sampler provided by this invention ensures smooth sampling, avoids flameout problems, and facilitates successful advancement of the burning oil layer. Furthermore, it allows the sampled gas to approximate the actual pressure of the oil-gas-water mixture within the physical simulation device, improving the accuracy of the research.

Description

Technical Field

[0001] This invention belongs to the field of oil layer sampling technology, specifically relating to a sampler and a physical simulation device for oil layer burning. Background Technology

[0002] Fire-induced oil reservoir combustion is an oil extraction method that uses electrical, chemical, or other methods to bring the oil reservoir to the ignition point of crude oil and continuously injects air to maintain stable combustion in the reservoir. It is used to extract heavy or extra-heavy oil. By artificially igniting the crude oil, some of the crude oil is burned in situ. The combustion front generates very high temperatures, which evaporate interstitial water and light components in the crude oil in situ. The carbon dioxide and water vapor produced by the crude oil combustion come into contact with the "cold crude oil" to form a displacement front similar to steam flooding, flux miscible flooding, and carbon dioxide flooding.

[0003] During the burning of the oil reservoir, six zones are formed sequentially at the injection and production ends: the burned zone, the fire line, the coking zone, the condensation zone, the oil wall, and the remaining oil zone. In different zones, crude oil undergoes low-temperature oxidation, high-temperature oxidation, and heavy oil thermal cracking reactions. The combustion process and mechanism of burning the oil reservoir are extremely complex. Usually, simulation tests are conducted in the laboratory before field tests are carried out.

[0004] When conducting simulation studies of burned oil reservoirs in the laboratory, oil, gas, and water sampling and analysis are required. Currently, oil, gas, and water samples are taken from the produced end using pipelines, and then the oil, gas, and water samples are separated before analysis. However, this type of pipeline sampler cannot sample all areas of the burned oil reservoir, which can easily lead to fire suppression problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a sampler and a physical simulation device for burning oil layers. This ensures a smooth sampling process, avoids fire suppression issues, and facilitates the successful advancement of burning oil layers. Furthermore, it allows the sampled material to closely approximate the actual pressure of the oil-gas-water mixture within the physical simulation device, thereby improving the accuracy of the research.

[0006] The technical solution of this invention is as follows:

[0007] On one hand, the present invention provides a sampler suitable for sampling oil, gas and water in different areas of a physical simulation device for burning oil reservoirs, the sampler comprising:

[0008] A sampling tube, wherein the sampling tube is provided with an open sampling cavity, and the sampling tube is provided with a sampling hole, the sampling hole of the sampling tube being operably connected to the bottom of the sampling cavity;

[0009] A stopper rod, one end of which is slidably and sealingly inserted into the sampling cavity of the sampling tube along the length of the sampling tube, and the other end of which is disposed outside the sampling tube.

[0010] Furthermore, the stopper rod is slidably fitted with a first sealing ring, and the outer side of the first sealing ring is fixedly pressed against the inside of the sampling cylinder.

[0011] Furthermore, the first sealing ring is made of graphite.

[0012] Furthermore, multiple first sealing rings are provided, and the multiple first sealing rings are slidably sleeved on the outside of the plug rod along the axial direction of the plug rod.

[0013] Furthermore, a second sealing ring is pressed against each of the two sides of the first sealing ring, and the plug rod is slidably inserted into the two second sealing rings, with the outer sides of the two second sealing rings fixedly pressed against the sampling cylinder.

[0014] Furthermore, the two second sealing rings are made of copper.

[0015] Furthermore, the sampling cylinder has a protrusion inside. The second sealing ring near the bottom of the sampling cylinder abuts against the protrusion, and the second sealing ring away from the bottom of the sampling cylinder is pressed against an annular pressure pad connected inside the sampling cylinder.

[0016] The plug rod is inserted into the pressure pad.

[0017] Furthermore, the sampling tube has a stepped surface with an opening facing the sampling cavity to form the protrusion.

[0018] Furthermore, a guide block is provided on the outer side of the plug rod, and a sliding groove along the length direction of the sampling cylinder is provided on the upper inside of the sampling cylinder, and the guide block is slidably disposed in the sliding groove of the sampling cylinder;

[0019] The guide block is located on the side of the pressure pad away from the sampling hole of the sampling cylinder.

[0020] Furthermore, multiple guide blocks are provided, and multiple grooves corresponding to the guide blocks are provided inside the sampling cylinder, with each guide block slidably disposed in the groove of the corresponding sampling cylinder.

[0021] Furthermore, the sampler also includes a screw sleeve and a handle, the screw sleeve being threadedly connected to the other end of the plug rod, the handle being connected to the screw sleeve, and the screw sleeve being disposed on one side of the sampling cylinder.

[0022] Furthermore, the sampler also includes a bearing sleeve and an axial thrust bearing. The bearing sleeve is connected to the open end of the sampling cylinder, the axial thrust bearing is embedded in the bearing sleeve, and the middle part of the threaded sleeve is embedded in the axial thrust bearing.

[0023] Furthermore, the sampling cylinder includes a fixed sleeve, the two ends of which are respectively connected to the sampling cylinder and the screw sleeve. An axial groove is provided inside the fixed sleeve, and the guide block on the plug rod is slidably disposed in the groove of the fixed sleeve.

[0024] Furthermore, a valve is provided at one end of the sampling cylinder near the bottom of the cavity. The valve includes a valve body and a valve needle. The valve body is provided with a valve cavity that connects the sampling cavity and the sampling hole. The bottom of the valve needle can be operably pressed against or separated from the hole wall of the sampling hole so that the sampling cavity and the sampling hole are disconnected or connected.

[0025] On the other hand, the present invention provides a physical simulation device for burning oil layers, the simulation device including a simulator and at least one of the above-mentioned samplers, wherein the sampling port of the sampler is connected to the sampling port of one region of the burning oil layer of the simulator.

[0026] The beneficial effects of the present invention include at least the following:

[0027] This invention provides a sampler and a physical simulation device for burning oil reservoirs, suitable for sampling oil, gas, and water in different areas of the physical simulation device. The sampler includes a sampling cylinder and a stopper rod. The sampling cylinder has an open sampling chamber and a sampling hole, which is operably connected to the bottom of the sampling chamber. One end of the stopper rod is slidably and sealed within the sampling chamber along the length of the sampling cylinder, while the other end is located outside the sampling cylinder. Currently, a pipe sampler is used to directly sample the oil, gas, and water mixture at the production end of the physical model of the burning oil reservoir. One end of the pipe sampler is connected to the production end of the physical simulation device, and the other end is connected to a sample collection container. After sampling, oil, gas, and water separation and analysis are performed. However, due to the poor sealing of the pipe sampler, directly sampling various areas of the simulation device with the pipe sampler can cause fire suppression problems, and in severe cases, extinguish the burning oil reservoir, making normal oil production impossible. Using the sampler provided in this embodiment of the invention, before the physical simulation of the burning oil layer, a number of samplers equal to the number of sampling locations are prepared. Each sampler corresponds one-to-one with a region of the burning oil layer, and the sampling port of the sampler is connected to the corresponding sampling port of the physical simulation device for the burning oil layer. Then, a certain amount of pressurized air is injected into the injection end of the physical model and ignited. During the burning of the oil layer, the sampling port of the sampling tube is connected to the sampling chamber, and one end of the stopper rod is slid away from the bottom of the sampling chamber. This allows the stopper rod to... A cavity is created between one end and the bottom of the sampling chamber. Due to the low pressure in this cavity, the oil-gas-water mixture in the simulated oil layer will spontaneously flow from the high-pressure oil layer in the physical simulation device into this low-pressure cavity under the influence of the pressure difference. Because the sampling chamber of this sampler is sealed, the fire in the physical simulation device will not be extinguished during the sampling process, thus preventing the oil layer from going out and allowing normal advancement. Once the sampler has collected the oil-gas-water mixture, the sampling cylinder... The sampling process is completed by cutting off the channel between the sampling port and the sampling chamber. Furthermore, since the oil-gas-water mixture within the burning oil layer is always under high pressure, and before sampling, one end of the stopper rod is positioned at the bottom of the sampling chamber, the mixture enters the sampling chamber during extraction. Because the stopper rod is adjustable, the pressure within the sampling chamber can be made the same as the oil-gas-water pressure in the physical simulation device. This ensures that the pressure of the sampled oil-gas-water mixture closely approximates the actual pressure within the burning oil layer, making it easier to obtain samples that closely resemble real-world conditions and improving the accuracy of the research. In contrast, traditional pipe samplers operate at atmospheric pressure, releasing pressure after the oil-gas-water sample is extracted, resulting in a significant deviation from reality. Therefore, the sampler provided by this invention ensures a smooth sampling process, preventing fire suppression and facilitating the successful advancement of the burning oil layer. It also ensures that the sampled mixture closely approximates the actual pressure of the oil-gas-water mixture within the physical simulation device, further improving the accuracy of the research. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a sampler according to this embodiment;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure of the first and second sealing rings.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Sampling cylinder, 101-Sampling chamber, 102-Sampling hole, 103-Protrusion, 104-Slide groove, 2-Plug rod, 3-First sealing ring, 4-Second sealing ring, 5-Pressure pad, 6-Bearing sleeve, 7-Axial thrust bearing, 8-Threaded sleeve, 9-Handle, 10-Guide block, 11-Valve, 1101-Valve body, 1102-Valve needle, 12-Fixing sleeve. Detailed Implementation

[0032] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Figure 1 This is a schematic diagram of the structure of a sampler according to this embodiment. Figure 2 for Figure 1 The structural diagrams of the first and second sealing rings in the diagram are combined with... Figure 1 as well as Figure 2 On the one hand, the present invention provides a sampler suitable for sampling oil, gas and water in different areas of a physical simulation device for burning oil layers. The sampler includes a sampling cylinder 1 and a stopper rod 2.

[0034] The sampling cylinder 1 has a sampling cavity 101 arranged axially, with an opening at one axial end. The sampling cylinder 1 has a sampling hole 102 arranged radially, and the sampling hole 102 is operably connected to the bottom of the sampling cavity 101. One end of the stopper rod 2 is slidably and sealed inside the sampling cavity 101 of the sampling cylinder 1 along the length direction of the sampling cylinder 1, and the other end of the stopper rod 2 is located outside the sampling cylinder 1.

[0035] Currently, a pipe sampler is used to directly sample the oil, gas and water mixture at the production end of the physical model of the burned oil layer. One end of the pipe sampler is connected to the production end of the physical simulation device, and the other end is connected to the sample collection container. After sampling, oil, gas and water are separated and analyzed. However, due to the poor sealing of the pipe sampler, directly sampling various areas of the simulation device with the pipe sampler will cause fire suppression problems. In severe cases, it can extinguish the burned oil layer and prevent normal oil production. Using the sampler provided in this embodiment of the invention, before the physical simulation of the burning oil layer, a number of samplers equal to the number of sampling locations are prepared. Each sampler corresponds to a specific area of ​​the burning oil layer, and the sampling port of the sampler is connected to the corresponding sampling port of the physical simulation device. Then, a certain amount of pressurized air is injected into the injection end of the physical model and ignited. During the burning oil layer process, the sampling port 102 of the sampling cylinder 1 is connected to the sampling chamber 101, and one end of the stopper rod 2 is slid away from the bottom of the sampling chamber 101. This creates a cavity between the end of the stopper rod 2 and the bottom of the sampling chamber 101. Because the pressure in this cavity is low, the oil-gas-water mixture in the simulation device will spontaneously enter this low-pressure cavity from the high-pressure burning oil layer in the physical simulation device under the action of the pressure difference. Because the sampling chamber 101 of the sampler is sealed, during the sampling process... The fire inside the physical simulation device will not be extinguished, thus ensuring the burning oil layer does not go out and can proceed normally. After the sampler obtains the oil-gas-water mixture, the channel between the sampling port of sampling cylinder 1 and sampling chamber 101 is cut off, thus completing the sampling. In addition, since the oil-gas-water mixture in the burning oil layer is always under high pressure, and before sampling, one end of the stopper rod 2 is at the same position as the bottom of sampling chamber 101, when the oil-gas-water mixture is extracted, the mixture enters the sampling chamber. Since the stopper rod is adjustable, the pressure in the sampling chamber can be made the same as the oil-gas-water pressure of the physical simulation device. This makes the pressure of the oil-gas-water sample obtained close to the actual oil-gas-water pressure in the burning oil layer, which is more conducive to obtaining oil-gas-water samples that are close to the real state and improving the accuracy of the research. In contrast, traditional pipeline samplers are at atmospheric pressure, and after the oil-gas-water sample is taken out, the pressure is released to be the same as atmospheric pressure, resulting in a large deviation compared with the real situation.

[0036] The distance between the stopper rod 2 and the bottom of the sampling chamber 101 can be used to control the volume of oil, gas and water samples, and at the same time control the pressure during sampling to ensure that the sampling pressure does not drop.

[0037] Specifically, in combination Figure 1 In this embodiment, the plug rod 2 is slidably fitted with a first sealing ring 3, and the outer side of the first sealing ring 3 is fixedly pressed against the inside of the sampling cylinder 1.

[0038] The first sealing ring 3 can be made of graphite. Since the temperature of the burning oil layer in the physical simulation device reaches 700℃, which is in the ultra-high temperature range, ordinary rubber seals cannot adapt to the ultra-high temperature environment and conventional piston sampling methods cannot be selected. By adopting the plunger sealing method with graphite packing, the first sealing ring 3 can achieve the seal between the plunger rod 2 and the sampling cylinder 1.

[0039] Combination Figure 2 Multiple first sealing rings 3 can be provided. Multiple first sealing rings 3 are slidably sleeved on the outside of the plug rod 2 along the axial direction of the plug rod 2. For example, two first sealing rings 3 can be provided, or three first sealing rings 3 can be provided. The number of first sealing rings 3 is not limited here.

[0040] To achieve a better sealing effect, combined with Figure 2 In this embodiment, two second sealing rings 4 are respectively pressed against both sides of the first sealing ring 3, and the plug rod 2 is slidably inserted into the two second sealing rings 4. The outer sides of the two second sealing rings 4 are fixedly pressed against the sampling cylinder 1. Specifically, the two second sealing rings 4 are made of copper. Copper has lower hardness and larger volume at high temperatures, which can reduce the gap between the second sealing ring 4 and the sampling cylinder 1 and the plug rod 2, preventing the first sealing ring 3 from being squeezed into the gap between the second sealing ring 4 or the second sealing ring 4 and the plug rod 2, causing the plug rod 2 to jam. At the same time, the second sealing ring 4 made of copper has good lubricity and will not affect the axial movement of the plug rod 2.

[0041] Furthermore, combined Figure 1 and Figure 2 In this embodiment, a protrusion 103 is provided inside the sampling cylinder 1. The second sealing ring 4 near the bottom of the cavity of the sampling cylinder 1 presses against the protrusion 103 of the sampling cylinder 1. The second sealing ring 4 away from the bottom of the cavity of the sampling cylinder 1 is pressed against and connected to the annular pressure pad 5 connected inside the sampling cylinder 1. The plug rod 2 is inserted into the pressure pad 5. In this way, the first sealing ring 3 and the two second sealing rings 4 can be fixed.

[0042] Furthermore, combined Figure 1 The sampling cylinder 1 may have a stepped surface with an opening facing the sampling chamber 101 to form the aforementioned protrusion 103. Alternatively, a single annular protrusion or multiple annular block protrusions 103 may be provided inside the sampling cylinder 1. This is not a limitation and can be selected based on the desired effect in practical applications. However, it is necessary to ensure that there is a gap between the outer side of the stopper rod 2 and the protrusion 103 of the sampling cylinder 1 to ensure the smooth sliding of the stopper rod 2.

[0043] Furthermore, to prevent rotation during the sliding of stopcock 2, combined with Figure 1In this embodiment, a guide block 10 is provided on the outer side of the plug rod 2, and a sliding groove 104 along the axial direction of the sampling cylinder 1 is provided on the inner upper part of the sampling cylinder 1. The guide block 10 is slidably disposed in the sliding groove 104 of the sampling cylinder 1. The guide block 10 is disposed on the side of the pressure pad 5 away from the sampling hole 102 of the sampling cylinder 1.

[0044] Furthermore, combining Figure 1 Multiple guide blocks 10 can be provided. Multiple grooves 104 corresponding to guide blocks 10 are provided inside the sampling cylinder 1. Each guide block 10 is slidably disposed in the groove 104 of the corresponding sampling cylinder. Two guide blocks 10 can be provided. The two guide blocks 10 can be realized by a guide shaft inserted through the center line of the stopper rod 2. The two ends of the guide shaft extend out of the stopper rod 2 to form two guide blocks 10. The number of guide blocks can also be three or four, and the specific number is not limited.

[0045] Furthermore, in order to achieve the sliding of the stopper rod 2 along the length direction of the sampling cylinder 1, in this embodiment, combined with Figure 1 The sampler also includes a screw sleeve 8 and a handle 9. The screw sleeve 8 is threadedly connected to the other end of the stopper rod 2, and the handle 9 is connected to the screw sleeve 8. The screw sleeve 8 is located on one side of the sampling cylinder 1. When the handle 9 is rotated, the screw sleeve 8 rotates with the handle 9, while the stopper rod 2 cannot rotate under the action of the guide block 10 and the slide groove 104. Therefore, the stopper rod 2 moves along the length direction, thereby realizing the sliding of the stopper rod 2. The threaded connection between the screw sleeve 8 and the stopper rod 2 makes the sampling volume precisely adjustable. After sampling, the pressure of the oil, gas and water samples in the sampling chamber is precisely adjustable, so that the pressure of the sample is as close as possible to the pressure in the burned oil layer.

[0046] Furthermore, in order to reduce the resistance of turning the handle 9, in this embodiment, combined with Figure 1 The sampler may also include a bearing sleeve 6 and a bearing thrust bearing 7. The bearing sleeve 6 is connected to the open end of the sampling cylinder 1, and the bearing thrust bearing 7 is embedded in the bearing sleeve 6. The middle part of the threaded sleeve 8 is embedded in the bearing thrust bearing 7. The bearing thrust bearing 7 may be a thrust ball bearing. Multiple thrust ball bearings may be arranged along the length of the piston rod 2, such as two or three, which is not limited here. The number of thrust ball bearings should match the number of bearing sleeves 6 that can be fixed. More specifically, the shaft ring of each thrust ball bearing is connected to the outer side of the other end of the piston rod 2, and the seat ring of each thrust ball bearing is fixedly set on the bearing sleeve 6. The rollers of the thrust ball bearing can effectively reduce the rotational resistance of the handle 9, realizing safe and convenient ultra-high temperature and high pressure sampling. The bearing sleeve 6 can be connected to the sampling cylinder 1 by bolts. The handle 9 can also be connected to the threaded sleeve 8 by threads.

[0047] For ease of installation, in this embodiment, the sampler may also include a fixed sleeve 12, with both ends of the fixed sleeve 12 connected to the sampling cylinder 1 and the screw sleeve 8 respectively. The fixed sleeve 12 is provided with an axial groove 104, and the guide block 10 on the plug rod 2 is slidably disposed in the groove 104 of the fixed sleeve 12.

[0048] Furthermore, combined Figure 1 In this embodiment, in order to connect and disconnect the sampling port of the sampling cylinder 1 with the sampling chamber 101, a valve 11 can be provided at one end of the sampling cylinder 1 near the bottom of the chamber. The valve 11 can include a valve body 1101 and a valve needle 1102. The valve body 1101 is provided with a valve cavity that connects the sampling chamber 101 and the sampling hole 102. The bottom of the valve needle 1102 can be operated to press against or move away from the hole wall of the sampling hole 102 so that the sampling chamber 101 and the sampling hole 102 are disconnected or connected. More specifically, the valve cavity of the valve body 1101 can be coaxially connected with the sampling port of the sampling cylinder 1, and the body of the valve cavity can be connected with the cavity of the sampling chamber 101. The bottom diameter of the valve cavity can be larger than the diameter of the sampling hole 102, so that the bottom of the valve needle 1102 can press against the bottom of the valve cavity to achieve the connection between the sampling port and the sampling chamber 101. The bottom of the valve needle 1102 can also be set as conical. Of course, the above is just an example. The valve 11 is an existing technology and can be flexibly selected as needed. It is not limited here.

[0049] On the other hand, embodiments of the present invention also provide a physical simulation device for burning oil layers. This simulation device includes a simulator and at least one of the aforementioned samplers, with the sampling port of the sampler connected to one of the sampling ports of the burning oil layer region of the simulator. For example, when sampling is required for the fire line, condensation zone, and oil wall region respectively, three samplers can be prepared, each connected to a sampling port of the physical simulation device corresponding to the fire line, condensation zone, and oil wall region, for separate sampling. Sampling can also be performed on the positions of the simulator corresponding to the burned zone, coking zone, and remaining oil zone; this is not limited to these methods.

[0050] A valve can also be set at the sampling port on the simulator to control the opening and closing of the sampling port. The choice of valve is not limited here.

[0051] The sampler and physical simulation device for burning oil layers provided by this invention have at least the following advantages:

[0052] (1) It can realize online sampling of different zones during the burning of oil layers, and extract samples from multiple points, so as to obtain fluid samples from different zones during the fire driving process;

[0053] (2) The physicochemical reaction characteristics of crude oil during fire flooding were analyzed.

[0054] (3) The pressure compensation design ensures the safe extraction of fluid samples under high temperature and high pressure conditions;

[0055] (4) It enables online sampling of complex fluids in porous media, and the sampling volume and the pressure of the sample are precisely adjustable;

[0056] (5) Ensure the sampling process proceeds smoothly and avoid fire suppression problems, so that the burning oil layer can be successfully advanced;

[0057] (6) This makes the sample taken close to the actual pressure of the oil-gas-water mixture in the physical simulation device, thereby improving the accuracy of the study.

[0058] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0059] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A sampler suitable for online sampling of oil, gas, and water in different areas of a physical simulation device for burning oil reservoirs, characterized in that, The sampler includes: A sampling cylinder has a sampling cavity arranged along the axial direction, an opening at one axial end of the sampling cavity, and a sampling hole arranged along the radial direction, the sampling hole of which is operably connected to the bottom of the sampling cavity. A stopper rod, one end of which is slidably and sealingly inserted into the sampling cavity of the sampling tube along the length direction of the sampling tube, and the other end of which is disposed outside the sampling tube; During the sampling process, the fire inside the material simulation device will not be extinguished, thus ensuring that the burning oil layer will not be extinguished and can proceed normally.

2. A sampler according to claim 1, characterized in that, The stopper rod is slidably fitted with a first sealing ring, and the outer side of the first sealing ring is fixedly pressed against the inside of the sampling cylinder.

3. A sampler according to claim 2, characterized in that, The first sealing ring is made of graphite.

4. A sampler according to claim 2, characterized in that, Multiple first sealing rings are provided, and the multiple first sealing rings are slidably sleeved on the outside of the plug rod along the axial direction of the plug rod.

5. A sampler according to claim 2, characterized in that, The first sealing ring has two second sealing rings pressed against each other on both sides. The plug rod is slidably inserted into the two second sealing rings, and the outer sides of the two second sealing rings are fixedly pressed against the sampling cylinder.

6. A sampler according to claim 5, characterized in that, The two second sealing rings are made of copper.

7. A sampler according to claim 1, characterized in that, The sampling cylinder has a protrusion inside. The second sealing ring near the bottom of the sampling cylinder abuts against the protrusion, and the second sealing ring away from the bottom of the sampling cylinder is pressed against an annular pressure pad connected inside the sampling cylinder. The plug rod is inserted into the pressure pad.

8. A sampler according to claim 7, characterized in that, The sampling tube has a stepped surface with an opening facing the sampling cavity to form the protrusion.

9. A sampler according to claim 7, characterized in that, A guide block is provided on the outside of the plug rod, and a sliding groove is provided on the inside of the sampling tube along the length direction of the sampling tube. The guide block is slidably disposed in the sliding groove of the sampling tube. The guide block is located on the side of the pressure pad away from the sampling hole of the sampling cylinder.

10. A sampler according to claim 9, characterized in that, Multiple guide blocks are provided, and multiple sliding grooves corresponding to the guide blocks are provided inside the sampling cylinder. Each guide block is slidably disposed in the corresponding sliding groove of the sampling cylinder.

11. A sampler according to claim 9, characterized in that, The sampler also includes a screw sleeve and a handle. The screw sleeve is threaded to the other end of the plug rod, and the handle is connected to the screw sleeve. The screw sleeve is located on one side of the sampling cylinder.

12. A sampler according to claim 11, characterized in that, The sampler also includes a bearing sleeve and an axial thrust bearing. The bearing sleeve is connected to the open end of the sampling cylinder, the axial thrust bearing is embedded in the bearing sleeve, and the middle part of the threaded sleeve is embedded in the axial thrust bearing.

13. A sampler according to claim 11, characterized in that, The sampling cylinder includes a fixed sleeve, the two ends of which are respectively connected to the sampling cylinder and the screw sleeve. The fixed sleeve is provided with an axial sliding groove, and the guide block on the plug rod is slidably disposed in the sliding groove of the fixed sleeve.

14. A sampler according to any one of claims 1-13, characterized in that, A valve is provided at one end of the sampling cylinder near the bottom of the cavity. The valve includes a valve body and a valve needle. The valve body is provided with a valve cavity that connects the sampling cavity and the sampling hole. The bottom of the valve needle is operable to press against or separate from the hole wall of the sampling hole so that the sampling cavity and the sampling hole are disconnected or connected.

15. A physical simulation device for burning oil layers, characterized in that, The simulation device includes a simulator and at least one sampler as described in any one of claims 1-14, wherein the sampling port of the sampler is connected to the sampling port of one region of the burned oil layer of the simulator.

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