A high temperature and high pressure microscopic visualization microscopic displacement model clamping device and use method

Abstract

The present invention provides a high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device and a method for using the same. The high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device comprises: a model cabin upper pressure cover, a model cabin base, a model experimental chamber body, an upper glass column, a lower glass column, a microscopic model, a model cabin heat insulation board, a ring heater, an upper vacuum interlayer base, a displacement channel, an observation light source, and a micro stepper; the model cabin upper pressure cover is arranged above the model experimental chamber body; the upper glass column is arranged between the model cabin upper pressure cover and the upper vacuum interlayer base, and an upper vacuum insulation layer is formed between the upper glass column and the upper vacuum interlayer base. The high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device and a method for using the same provided by the present invention have the advantages of being able to continuously observe different parts of a glass slide, effectively maintain temperature stability, and meet the requirements of temperature-sensitive microscopic experiments.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental devices, and in particular to a high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device and a use method thereof. Background Art

[0002] Microscopic visualization displacement experiments are an important means of understanding the flow laws of fluids in pores. Temperature and pressure have a significant impact on the properties of oil / water and gas / water fluids. In order to accurately restore the flow laws of fluids in underground reservoirs, it is necessary to accurately restore the high temperature and high pressure conditions of the reservoirs. The production principle of a microscopic glass etching model or a silicon-based etching model is to assemble a substrate with porous flow channels and quartz glass together through vacuum bonding. The internal flow channel pressure resistance generally does not exceed 10MPa. By applying external pressure to the microscopic model, the pressure resistance of the internal flow channel can be effectively increased. At present, some high-temperature and high-pressure microscopic model supporting devices that can improve the pressure resistance of microscopic models have appeared.

[0003] The application number is: 202011013509.1, which is a microscopic visualization clamp under high temperature and high pressure conditions and its use method. It can be used for microscopic displacement tests under high temperature and high pressure conditions. The clamp includes an upper pressure plate, an upper glass column, an upper cover, a clamping mechanism, a displacement channel, a model pressure plate, a lower pressure plate, a lower glass column and a heating sleeve. The upper cover is pressed on the top of the clamping mechanism, the upper pressure plate is pressed and fixed on the top of the upper cover, and the upper glass column is fixed between the upper pressure plate and the upper cover; the displacement channel is arranged in the clamping structure and connected to the test model, and the model pressure plate is pressed on the test model; the lower pressure plate is pressed under the clamping mechanism, a lower glass column is arranged between the lower pressure plate and the clamping mechanism, and the heating sleeve is arranged on the clamping mechanism. The use of the clamp for experiments can directly observe the seepage characteristics, facilitate the study of microscopic oil displacement mechanism and recovery rate, etc., and can also be placed under a microscope for observation to accurately characterize the distribution state of the injected medium, but it cannot meet some microscopic experimental requirements that are sensitive to temperature;

[0004] Patent WO2022148193A1 discloses a microscopic visualization experimental device for fluid displacement under high temperature and high pressure conditions. The invention of this experimental device can reproduce the high temperature and high pressure conditions of the real reservoir, simulating the distribution state and migration characteristics of oil, water and gas in the microporous structure, but when the microscopic slide is magnified and observed under a microscope, the device cannot continuously observe different parts of the slide. At the same time, when simulating the high temperature conditions of the formation, the design of this type of clamp basically heats the high temperature and high pressure experimental chamber by means of heating sleeves, heating rods, etc., and installs temperature sensors to monitor the temperature and maintain temperature stability. Prior art CN 103334726 A heats the model cabin by built-in ceramic electric heating rods in the upper cover of the model cabin, and at the same time, the upper cover of the model cabin and the outside of the model cabin base 12 are covered with model cabin insulation sleeves to prevent the temperature from dropping too fast. However, the effect of this method of maintaining temperature stability is limited, and the temperature of the high temperature and high pressure chamber will still fluctuate within a certain range of variation, which cannot meet the requirements of some microscopic experiments that are sensitive to temperature.

[0005] Therefore, the present application proposes a high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device and a method of use, which fully considers the temperature stability problem during the high-temperature and high-pressure microscopic visualization displacement experiment, as well as the problem of realizing continuous observation of the microscopic model in different directions. Summary of the invention

[0006] In order to solve the technical problems that different parts of the glass slide cannot be continuously observed, the effect of maintaining temperature stability is limited, and the requirements of certain temperature-sensitive microscopic experiments cannot be met, the present invention provides a high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device and a method of use.

[0007] The high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device provided by the present invention comprises: a model cabin upper pressure cover, a model cabin base, a model experimental chamber body, an upper glass column, a lower glass column, a microscopic model, a model cabin heat insulation board, a ring heater, an upper vacuum insulation layer base, a displacement channel, an observation light source and a micro stepper; the model cabin upper pressure cover is arranged above the model experimental chamber body; the upper glass column is arranged between the model cabin upper pressure cover and the vacuum insulation layer base, and an upper vacuum insulation layer is formed between the upper glass column and the vacuum insulation layer base; the lower glass column is fixed at the lower window position of the model experimental chamber body, and forms a lower vacuum insulation layer with the model cabin base; The upper vacuum barrier base is arranged at the lower part of the upper pressure cover; the model experiment chamber body is arranged above the model cabin base; the observation light source is arranged inside the model cabin base; the model cabin heat insulation board is arranged on the inner wall of the microscopic experiment chamber formed by the model cabin upper pressure cover, the model experiment chamber body and the model cabin base; the annular heater is arranged inside the microscopic experiment chamber, close to the model cabin heat insulation board; the microscopic model is arranged inside the microscopic experiment chamber, fixed on the microscopic model fixing device, and connected with the outside through the displacement pipeline and the displacement channel; the displacement channel is arranged inside the model experiment chamber body; the micro stepper is arranged below the model cabin base.

[0008] Preferably, the upper glass column and the lower glass column are both made of sapphire glass material.

[0009] Preferably, a rubber sealing ring is provided between the upper glass column and the vacuum barrier base to ensure sealing, and a rubber sealing ring is also provided between the upper vacuum barrier base and the upper pressure cover of the model cabin to ensure sealing.

[0010] Preferably, the model cabin insulation board adopts mica hard insulation board, which can withstand high temperature of 500°C under continuous use conditions; the annular heater adopts a customized high-temperature ceramic heating ring, equipped with a temperature probe, and combined with a matching thermostat to accurately control the temperature, and the temperature control range is 0~120°C.

[0011] Preferably, the micro stepper is designed with a turntable with angle scales, and the turntable can rotate at any angle around its own central axis; the turntable is fixed to a high-precision square rail slider by bolts, and the square rail slider can be displaced along a high-precision lead screw, and the rotation angle, displacement distance, and speed are controlled by a motor controller.

[0012] Preferably, the microscopic model is a glass chip specially treated by a low-temperature adhesive-free bonding process and can withstand a pressure of 10 MPa. By adding a confining pressure in the experimental chamber of the device to control the pressure difference between the inside and outside of the chip within 10 MPa, a microscopic displacement experiment under a high-pressure condition of up to 50 MPa can be achieved.

[0013] A method for using a microscopic visualization displacement model holder under high temperature and high pressure conditions, using the microscopic visualization holder under high temperature and high pressure conditions to conduct an experiment, the steps comprising:

[0014] A. Prepare the experimental tools and install and fix the upper glass column and upper vacuum barrier base in sequence;

[0015] B. Place and fix the micro model in the micro model fixture inside the micro experiment chamber;

[0016] C. Sequentially fix and connect the model cabin upper cover, model cabin base and model test chamber body;

[0017] D. The gripper and micro-stepper are installed and placed on the test bench;

[0018] E. Connect the thermostat and motor controller;

[0019] F. Connect the confining pressure inlet on the holder, open the confining pressure drain port, and when no more bubbles appear at the drain port, close the confining pressure drain port and continue to pressurize until the confining pressure reaches 0.2MPa;

[0020] G. Use a vacuum pump to extract the air in the upper and lower insulation layers through the vacuum channels of the upper and lower insulation layers and maintain the vacuum state;

[0021] H. Heat the experimental chamber to the target temperature, and continue to pressurize it to the target pressure after the confining pressure stabilizes;

[0022] I. Connect the inlet and outlet of the displacement channel and conduct displacement experiments;

[0023] J. During the experiment, the displacement process in the experimental microscopic model was observed through a microscope;

[0024] K. During the experiment, the holder can be rotated at different angles by a stepper and displaced along the wire track to continuously observe and record the pore throat structure, fluid migration path and distribution state in different areas of the microscopic model at high magnification;

[0025] L. Stop heating after the experiment and unload the confining pressure after the temperature reaches room temperature.

[0026] Further preferably, the experimental tools include a constant pressure pump, a pressure gauge, a stainless steel pipeline, bolts, an electron microscope, a fluororubber sealing ring, and a dead plug.

[0027] Further preferably, the displacement experiment includes a seepage experiment of multiple fluids such as oil, gas and water in microscopic pore throats.

[0028] Further preferably, when the displacement process in the experimental model is observed by a microscope, there is an incident light source in the model cabin base 12 along the direction of the visible window.

[0029] Compared with the related art, the high temperature and high pressure microscopic visualization microscopic displacement model clamping device and the use method provided by the present invention have the following beneficial effects:

[0030] The present invention provides a high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device and a method of use:

[0031] 1. Through this experimental device, when conducting high-temperature and high-pressure microscopic visualization displacement experiments, the vacuum barrier and heat insulation board inside the holder can reduce the heat loss of the internal chamber and reduce temperature fluctuations, while the intelligent temperature monitoring device can provide more stable temperature conditions at any time;

[0032] 2. In the process of observing the microscopic model device, adjust the displacement in different directions on the horizontal plane, and continuously observe and record the migration path and distribution state of the fluid in the pore throat structure in different areas of the microstructure during the experiment;

[0033] 3. This experimental device can overcome the problem of the existing technology that it is impossible to conduct temperature-sensitive microscopic displacement experiments in visualized microscopic models. At the same time, it can overcome the problem of continuous microscopic observation of microscopic glass slide models and realize visualized microscopic displacement experiments using larger-sized microscopic glass slide models. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural cross-sectional diagram of a high-temperature and high-pressure microscopic visualized displacement model clamping device of the present invention;

[0035] Figure 2 It is a three-dimensional schematic diagram of the displacement model holder part in the device of the present invention;

[0036] Figure 3 is a top view of the displacement model holder portion of the device of the present invention;

[0037] Figure 4 It is a front view of the stepping machine part of the device of the present invention;

[0038] Figure 5 It is a top view of the stepping machine part in the device of the present invention.

[0039] Numbers in the figure: 1. Upper glass column; 2. Upper vacuum insulation layer; 3. Vacuuming channel of upper insulation layer; 4. Upper fixing bolts; 5. Upper pressure cover of model cabin; 6. Model experimental chamber body; 7. Confining pressure evacuation port; 8. Displacement outlet; 9. Temperature monitoring and control socket; 10. Lower fixing bolts; 11. Turntable fixing bolts; 12. Model cabin base; 13. Lower glass column; 14. Lower vacuum insulation layer; 15. Observation light source; 16. Vacuuming channel of lower insulation layer; 17. Model cabin insulation board; 18. Ring heater; 19. Confining pressure inlet; 20. Displacement inlet; 21. Micro model fixing device; 22. Micro model; 23. Outer rubber sealing ring; 24. Upper vacuum compartment base fixing bolt; 25. Upper vacuum compartment base; 26. Inner rubber sealing ring; 27. Temperature probe connecting line; 28. Ring heater control line; 29. ​​Temperature controller; 30. Micro stepper; 31. Motor controller; 32. Stepper power socket; 33. Stepper turntable; 34. Angle scale; 35. High-precision screw rod; 36. Square rail slider. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0041] Please refer to Figure 1-5 ,in, Figure 1 It is a schematic structural cross-sectional diagram of a high-temperature and high-pressure microscopic visualized displacement model clamping device of the present invention, and is also a schematic structural diagram of Example 1;

[0042] Figure 2 It is a three-dimensional schematic diagram of the displacement model holder part in the device of the present invention;

[0043] Figure 3 is a top view of the displacement model holder portion of the device of the present invention;

[0044] Figure 4 It is a front view of the stepping machine part of the device of the present invention;

[0045] Figure 5 It is a top view of the stepping machine part in the device of the present invention.

[0046] The high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device comprises: a model cabin upper pressure cover 5, an upper glass column 1, a model experimental chamber body 6, a microscopic model fixing device 21, a model cabin heat insulation board 17, a ring heater 18, a lower glass column 13, a model cabin base 12 and a micro stepper; the structures of each device are closely matched and the sealing is ensured by a rubber sealing ring, so that the displacement seepage experiment is carried out under high pressure conditions; in addition, through the coordinated use of a temperature controller, a heat insulation board and a vacuum insulation layer, a more stable displacement seepage experiment under high temperature conditions is achieved;

[0047] The model cabin upper pressure cover 5 is arranged above the model experiment chamber body 6, the upper glass column 1 is arranged between the model cabin upper pressure cover 5 and the vacuum insulation base 25, and the model cabin base 12 is arranged below the model experiment chamber body 6; the model cabin upper pressure cover, the model experiment chamber body, the vacuum insulation base, and the model cabin base are connected and fixed with bolts, and the sealing is ensured by a rubber sealing ring; each fluid channel includes a displacement inlet 20, a displacement outlet 8, a confining pressure inlet 19, a confining pressure exhaust port 7, an upper insulation layer vacuum channel 3, and a lower insulation layer vacuum channel 16, wherein the displacement inlet, the displacement outlet, the confining pressure inlet, and the confining pressure exhaust port are all arranged inside the model experiment chamber body 6, the upper insulation layer vacuum channel is arranged inside the model cabin upper pressure cover 5, and the lower insulation layer vacuum channel is arranged inside the model cabin base 12; the displacement inlet and the displacement outlet are connected to the micro model 22 through a micro model fixing device 21, and the confining pressure inlet and the confining pressure exhaust port facilitate stable high-pressure loading; the model The cabin heat insulation board 17 is arranged on the inner wall of the microscopic experimental chamber formed by the model cabin upper pressure cover 5, the model experimental chamber body 6, and the model cabin base 12; the annular heater 18 is arranged inside the microscopic experimental chamber, close to the model cabin heat insulation board 17, and connected to the external temperature controller 29 through the temperature monitoring and control socket 9, the temperature probe connection line 27, the annular heater control line 28; the upper vacuum insulation layer 2 is arranged between the upper glass column 1 and the vacuum insulation base 25; the lower vacuum insulation layer 14 is arranged between the lower glass column 13 and the model cabin base 12; the annular heater and the temperature controller provide high temperature experimental conditions and monitor the temperature in real time; the model cabin heat insulation board, the upper vacuum insulation layer, and the lower vacuum insulation layer greatly reduce the heat loss inside the device, reduce the temperature fluctuation range, and improve the stability of the temperature conditions; the model cabin upper pressure cover, the vacuum insulation base and the model experimental chamber body are coaxially provided with visual windows, and an observation light source is arranged in the model cabin base to facilitate the observation of the seepage experiment process;

[0048] The micro stepper 30 is arranged under the base of the model cabin and fixed by bolts; a turntable 33 and a square rail slider 36 are arranged on the stepper, and the turntable and the square rail slider are connected by bolts; an angle scale 34 is engraved on the turntable to record the rotation angle; the stepper is connected to the motor controller 31 through the stepper power socket 32; the motor controller can control the turntable to drive the clamp to rotate at any angle along the central axis of the turntable, and control the square rail slider to move at a constant speed on the high-precision screw rod 35;

[0049] A method for using a microscopic visualization displacement model holder under high temperature and high pressure conditions, using the microscopic visualization holder under high temperature and high pressure conditions to conduct an experiment, the steps comprising:

[0050] A. Prepare experimental tools, install the upper glass column and the upper vacuum barrier base in sequence, connect and fix them with the upper gland 5 of the model cabin with hexagonal bolts, and place fluororubber sealing rings between the upper glass column and the upper vacuum barrier base, and between the upper vacuum barrier base and the upper gland of the model cabin to ensure sealing; the experimental tools include two constant pressure pumps with a range of 80MPa, a mechanical pressure gauge with a range of 80MPa, stainless steel pipelines, hexagonal bolts, an electron microscope, fluororubber sealing rings, hexagonal wrenches, and dead plugs;

[0051] B. The micromodel 22 is placed and fixed in the micromodel fixing device 21 inside the micromodel experimental chamber, and connected to the displacement pipes 8 and 20; wherein the micromodel is provided with a seepage inlet and outlet, which is a circular through hole on the glass slide of the micromodel, and is penetrated through the pore throat channel etched in the glass slide. The micromodel specially treated by the low-temperature glue-free bonding process can withstand high temperature and high pressure;

[0052] C. Sequentially fix the model cabin upper cover 5, the model cabin base 12, and the model test chamber body 6 with hexagonal bolts;

[0053] D. Install the clamping part of the entire assembled device and the turntable 33 on the micro-stepping machine through the turntable fixing bolts 11 and place them on the test bench;

[0054] E. Connect the temperature controller 29 to the temperature monitoring and control socket 9 on the main body of the model experiment chamber through the temperature probe connection line 27 and the ring heater control line 28;

[0055] F. Connect the motor controller 31 to the stepper motor power socket 32 ​​to provide power to the stepper motor;

[0056] G. Connect the confining pressure inlet 19 on the gripper to the constant pressure pump, and inject hydraulic fluid into the experimental chamber until the hydraulic fluid flows out of the confining pressure drain port 7 and no more bubbles appear. Close the confining pressure drain port with a vent plug, and then temporarily maintain the confining pressure at 0.2 MPa;

[0057] H. Connect the vacuum pump to the vacuum channels of the upper and lower insulation layers through a stainless steel pipeline, turn on the vacuum pump, and after the air in the upper and lower insulation layers is extracted, use a dead plug to block the vacuum channels of the upper and lower insulation layers, so that the upper and lower insulation layers maintain a vacuum state;

[0058] I. operating the temperature controller 29 to control the annular heater 18 to raise the temperature inside the microscopic experimental chamber to the target experimental temperature;

[0059] J. Connect the displacement inlet 20 on the holder to the constant pressure pump through a stainless steel pipeline, and the displacement outlet 8 is also connected with a stainless steel pipeline, and the back pressure, metering container, etc. are connected as needed; then start the displacement experiment. During the process of pressurizing the inlet, if the experimental pressure does not exceed 10MPa, first directly increase the confining pressure to 10MPa, then inject the experimental fluid at the displacement inlet end, and increase the pressure to the target experimental pressure; if the experimental pressure exceeds 10MPa, since the upper limit of the internal and external pressure difference that the micro-model can withstand is 10MPa, the pressurization process of the confining pressure and the inlet pressure should adopt an alternating pressurization method, and always control the pressure difference between the confining pressure and the pressure inside the micro-model within 10MPa;

[0060] K. After the experiment begins, use a microscope to observe and record the displacement process in the micro-model. The light source in the model cabin base can be adjusted to improve the light conditions and the clarity of the observed image. During the observation process, in order to improve the observation accuracy, after increasing the microscope observation magnification, only a local area of ​​the micro-model can be observed. By operating the motor controller 31, the rotation angle of the stepper turntable 33, the displacement distance and speed of the square rail slider 36 along the high-precision screw rod 35 are set, and the pore throat structure, fluid migration path, seepage characteristics, etc. of different areas in the micro-model are continuously observed and recorded;

[0061] L. Stop heating at the end of the experiment, and unload the confining pressure after the temperature reaches room temperature; when unloading the confining pressure, alternately reduce the confining pressure and displace the inlet pressure according to the actual situation to keep the pressure difference between the inside and outside of the microscopic model within an acceptable pressure range.

[0062] It should be noted that the device structure and drawings of the present invention mainly describe the principles of the present invention. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. However, on the premise that technical personnel in this field understand the principles of the above invention, they can clearly know the details of its power mechanism, power supply system and control system.

[0063] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high temperature and high pressure microscopic visualization microscopic displacement model clamping device, characterized in that: include: The model cabin upper pressure cover, the model cabin base, the model experimental chamber body, the micro-model fixing device, the upper glass column, the lower glass column, the micro-model, the model cabin heat insulation board, the annular heater, the upper vacuum compartment base, the displacement channel, the observation light source and the micro-stepping machine; Wherein, the model cabin upper gland is arranged above the model experiment chamber body; The upper glass column is arranged between the upper pressure cover of the model cabin and the upper vacuum insulation base, and an upper vacuum insulation layer is formed between the upper glass column and the upper vacuum insulation base; The upper gland of the model cabin, the upper vacuum insulation base and the main body of the model experiment chamber are coaxially provided with visual windows, and the lower glass column is fixed at the position of the lower visual window of the main body of the model experiment chamber, and forms a lower vacuum insulation layer between the lower glass column and the model cabin base; The upper vacuum barrier base is arranged at the lower part of the upper gland; The model experiment chamber body is arranged above the model cabin base; The observation light source is arranged inside the model cabin base; Each fluid channel includes a displacement inlet, a displacement outlet, a confining pressure inlet, a confining pressure exhaust port, an upper insulation layer vacuum channel, and a lower insulation layer vacuum channel, wherein the displacement inlet, the displacement outlet, the confining pressure inlet, and the confining pressure exhaust port are all arranged inside the main body of the model experiment chamber, the upper insulation layer vacuum channel is arranged inside the upper pressure cover of the model cabin, and the lower insulation layer vacuum channel is arranged inside the base of the model cabin; The model cabin heat insulation board is arranged on the inner wall of the microscopic experimental chamber formed by the model cabin upper gland, the model experimental chamber body and the model cabin base; The annular heater is arranged inside the microscopic experimental chamber, close to the heat insulation board of the model cabin, and connected to the external temperature controller through the temperature monitoring and control socket, the temperature probe connecting line, and the annular heater control line; The micro-model is arranged inside the micro-experimental chamber, fixed on a micro-model fixing device, and communicated with the outside through a displacement pipeline and a displacement channel; The micro stepper is arranged below the base of the model cabin; the micro stepper is designed with a turntable with angle scales, and the turntable can rotate at any angle around its own central axis; the turntable is fixed to a high-precision square rail slider by bolts, and the square rail slider can be displaced along a high-precision lead screw, and the rotation angle, displacement distance, and speed are controlled by a motor controller.

2. The high temperature and high pressure microscopic visualization microscopic displacement model clamping device according to claim 1 is characterized in that: The upper glass column and the lower glass column are both made of sapphire glass material.

3. The high temperature and high pressure microscopic visualization microscopic displacement model clamping device according to claim 1 is characterized in that: A rubber sealing ring is arranged between the upper glass column and the upper vacuum barrier base to ensure sealing, and a rubber sealing ring is also arranged between the upper vacuum barrier base and the upper pressure cover of the model cabin to ensure sealing.

4. The high temperature and high pressure microscopic visualization microscopic displacement model clamping device according to claim 1 is characterized in that: The model cabin insulation board adopts mica hard insulation board, which can withstand high temperature of 500°C under continuous use conditions; the annular heater adopts a customized high-temperature ceramic heating ring, equipped with a temperature measuring probe, and combined with a matching thermostat to accurately control the temperature, and the temperature control range is 0~120°C.

5. The high temperature and high pressure microscopic visualization microscopic displacement model clamping device according to claim 1 is characterized in that: The microscopic model is a glass chip specially treated by a low-temperature glue-free bonding process and can withstand a pressure of 10 MPa. By adding a confining pressure in the experimental chamber of the device to control the pressure difference between the inside and outside of the chip within 10 MPa, a microscopic displacement experiment under a high-pressure condition of up to 50 MPa can be achieved.

6. A method for using a high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device, characterized in that: Using the high temperature and high pressure microscopic visualization microscopic displacement model clamping device according to any one of claims 1 to 5 to conduct an experiment, the steps include: A. Prepare the experimental tools and install and fix the upper glass column and upper vacuum barrier base in sequence; B. Place and fix the micro model in the micro model fixture inside the micro experiment chamber; C. Sequentially fix and connect the model cabin upper cover, model cabin base and model test chamber body; D. The gripper and micro-stepper are installed and placed on the test bench; E. Connect the thermostat and motor controller; F. Connect the confining pressure inlet on the holder and open the confining pressure drain port. When no more bubbles appear at the confining pressure drain port, close the confining pressure drain port and continue to pressurize until the confining pressure reaches 0.2MPa. G. Heat the experimental chamber to the target temperature, and continue to pressurize it to the target pressure after the confining pressure stabilizes; H. Connect the inlet and outlet of the displacement channel to conduct displacement experiments; I. Observe the displacement process in the experimental microscopic model through a microscope during the experiment; J. During the experiment, the holder is rotated at different angles by a stepper and displaced along the screw rod, and the pore throat structure, fluid migration path and distribution state of different areas in the microscopic model are continuously observed and recorded at high magnification; K. Stop heating after the experiment and unload the confining pressure after the temperature reaches room temperature.

7. The method for using the high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device according to claim 6, characterized in that: The experimental tools include a constant pressure pump, a pressure gauge, a stainless steel pipeline, bolts, an electron microscope and a fluororubber sealing ring.

8. The method for using the high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device according to claim 6, characterized in that: The displacement experiment includes a seepage experiment of multiple fluids such as oil, gas or water in microscopic pore throats.

9. The method for using the high-temperature and high-pressure microscopic visualization microscopic displacement model clamping device according to claim 6, characterized in that: When the microscope observes the displacement process in the experimental model, there is an incident light source along the direction of the visible window in the base of the model cabin.

Images