High-temperature and high-pressure microcosmic visual Raman reaction experiment device and method

Abstract

The invention discloses a high-temperature and high-pressure microcosmic visual Raman reaction experiment device and method. The device comprises a visual experiment system, an environment control system, a permeation system, a vacuum system and a data acquisition and processing system. According to the device, solute component changes in the core sample reaction process can be quantitatively analyzed, surface topography changes in the core sample reaction process can be continuously and microscopically observed, the permeation medium is one or a mixture of more of gas, supercritical gas and liquid, injection of most fluid media in the high-temperature and high-pressure environment is met, and various experiments can be carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to geotechnical experiments, in particular to a high-temperature and high-pressure micro-visualization Raman reaction experimental device and method. BACKGROUND

[0002] The high-temperature and high-pressure micro-visualization experimental device can simulate the reaction, seepage and displacement process under high-temperature and high-pressure environment, and is one of important equipment for studying the liquid-rock, gas-rock and liquid-gas-rock interaction. Based on the high-temperature and high-pressure micro-visualization experimental device, important references can be provided for the oil and gas reservoir, sandstone type uranium mine, natural gas hydrate formation, dry hot rock exploitation, deep energy storage development scheme adjustment and priority. The current high-temperature and high-pressure micro-visualization experimental device does not consider the influence of supercritical fluid and multi-phase medium injection on water-rock interaction and gas-water-rock interaction, does not match the actual formation conditions, and cannot accurately observe the micro-reaction, seepage and displacement process in the porous medium, cannot perform real-time quantitative analysis on the chemical reaction under high-temperature and high-pressure conditions, and the corresponding test error is large.

[0003] The Raman reaction device can monitor the micro-process of liquid-rock interaction and liquid-gas-rock interaction in real time, thereby deepening the understanding of the deep hydrothermal fluid activity and material circulation of the earth. The current Raman reaction device cannot meet the temperature and pressure conditions of some deep energy storage, oil and gas reservoir, uranium mine, geothermal and coal resources due to the maximum bearing temperature and pressure, cannot truly reproduce the formation environment, and cannot perform real-time observation on the micro-visualization seepage and displacement process of single-phase medium and multi-phase medium.

[0004] In summary: 1. The current high-temperature and high-pressure micro-visualization experimental device mainly performs real-time observation on the micro-seepage and displacement process of fluid under high-temperature and high-pressure conditions, and cannot perform online quantitative analysis on the chemical reaction of water-rock interaction and gas-water-rock interaction; 2. The current Raman reaction device mainly performs Raman spectrum collection and analysis on the chemical reaction of the injected solution, and cannot realize the micro-seepage and displacement process research under the real geological conditions; 3. The current high-temperature and high-pressure micro-visualization experimental device and Raman reaction device do not involve the micro-visualization reaction research of supercritical fluid and multi-phase medium injection under high-temperature and high-pressure conditions. SUMMARY

[0005] The present application aims to provide a high-temperature and high-pressure micro-visualization Raman reaction experimental device and a high-temperature and high-pressure micro-visualization Raman reaction experimental method based on the above device. The present application can quantitatively analyze the solute composition change in the core sample reaction process, can continuously micro-observe the surface morphology change in the core sample reaction process, the seepage medium is one or a mixture of multiple kinds of gas, supercritical gas and liquid, can meet the injection of most fluid media under high-temperature and high-pressure environment, and can carry out various experiments.

[0006] The technical scheme adopted by the present application is: A high-temperature and high-pressure micro-visualization Raman reaction experiment device, comprising: The visualization experiment system comprises an experiment model, a reaction kettle and an observation module; the experiment model comprises a thin slice-shaped core sample and upper and lower transparent plates clamped on both sides of the core sample and sealing the core sample with sealing glue; the two ends of the core sample on the experiment model are respectively provided with a fluid input channel and a fluid output channel; the reaction kettle can position and fix the experiment model; the reaction kettle is provided with an observation window, a confining pressure fluid inlet, a confining pressure fluid outlet, a permeation medium inlet, a permeation medium outlet and an immersion Raman probe; after the experiment model is positioned and fixed, the permeation medium inlet and the permeation medium outlet are respectively connected to the fluid input channel and the fluid output channel; the immersion Raman probe is electrically connected to a Raman spectrum analyzer for quantitative analysis of the solute composition change in the core sample reaction process; the observation module comprises a stereomicroscope capable of observing the core sample through the observation window; the stereomicroscope is electrically connected to an image processor for continuous micro-observation of the surface morphology change in the core sample reaction process; The environmental control system comprises a temperature control module and a pressure control module; the temperature control module is used for heating the reaction kettle to simulate the formation temperature; the pressure control module is used for pressurized delivery of confining pressure fluid into the reaction kettle through the confining pressure fluid inlet and setting back pressure at the confining pressure fluid outlet to simulate the formation stress; The permeation system comprises an injection module and a collection and metering module; the injection module is used for pressurized delivery of temperature-controllable permeation medium into the core sample through the permeation medium inlet, the permeation medium being one or a mixture of more than one of gas, supercritical gas and liquid; the collection and metering module is used for collection of the reacted permeation medium through the permeation medium outlet and metering of the gas phase and the liquid phase respectively; The vacuum system is used for vacuumizing the reaction kettle and the injection module before the experiment; The data acquisition and processing system is used for acquisition of data of the immersion Raman probe and the stereomicroscope, temperature and pressure in the reaction kettle, pressure, pressure difference, temperature and pH value before and after the permeation medium reaction, and storage and processing.

[0007] Preferably, the observation module further comprises a moving platform for moving the reaction kettle and a lifting platform for lifting the stereomicroscope.

[0008] Preferably, the main structure of the reaction kettle comprises a middle cylinder and upper and lower end covers sealingly installed at both ends of the middle cylinder; the observation window is fitted and installed in the wedge-shaped hole of the sealing ring through the wedge-shaped outer circle of the observation window, the sealing ring is installed on the upper and lower end covers respectively, and the wide end of the observation window is axially limited; the confining pressure fluid inlet, the confining pressure fluid outlet, the permeation medium inlet, the permeation medium outlet and the immersion Raman probe are threadedly installed on the middle cylinder and sealed by sealing rings; the lower end cover is provided with a structure for positioning and fixing the experiment model.

[0009] Preferably, the fluid input channel and the fluid output channel are etched and formed, and the outer interfaces of the fluid input channel and the fluid output channel are arranged on the bottom surface of the lower transparent plate. After the experimental model is positioned and fixed, the permeation medium inlet is connected to the fluid input channel through the connecting channels on the middle cylinder and the lower end cover in sequence, and the permeation medium outlet is connected to the fluid output channel through the connecting channels on the middle cylinder and the lower end cover in sequence.

[0010] Preferably, the temperature control module comprises an electric heating rod embedded on the reaction kettle and an electric heating sleeve sleeved on the reaction kettle; the pressure control module comprises a confining fluid container, a confining fluid tracking pump, a back pressure valve, a back pressure tracking pump and a recovery container, the confining fluid container, the confining fluid tracking pump and the confining fluid inlet are connected in sequence through pipelines, and the confining fluid outlet, the back pressure valve, the back pressure tracking pump and the recovery container are connected in sequence through pipelines.

[0011] Preferably, the injection module comprises a gas container one, a gas container two, a liquid container and a mixing tank; the gas container one is divided into two paths after passing through an inlet pressure regulating valve one, a safety valve one, a gas booster pump, a gas storage pressure container and a gas flow controller one, one path is connected to the mixing tank, and the other path is connected to the permeation medium inlet; the gas container two is connected to a constant speed and pressure pump through an inlet pressure regulating valve two, a safety valve two, a gas flow controller two and a high and low temperature constant temperature bath, the liquid container is connected to the constant speed and pressure pump, the constant speed and pressure pump is divided into two paths after passing through a steam generator and a plurality of intermediate pressure containers in parallel, one path is connected to the mixing tank, and the other path is connected to the permeation medium inlet; the mixing tank is connected to the permeation medium inlet.

[0012] Preferably, the intermediate pressure container, the steam generator, the gas storage pressure container, the mixing tank and the reaction kettle are made of a material with corrosion resistance.

[0013] A high-temperature and high-pressure micro-visualization Raman reaction experiment method based on the above high-temperature and high-pressure micro-visualization Raman reaction experiment device: Before the experiment: first select a core sample of a drilling target layer and process it into a thin slice with a suitable size, prepare an experimental model and obtain a fluid input channel and a fluid output channel, position and fix the experimental model in the reaction kettle, and make a permeation medium inlet and a permeation medium outlet respectively butt against the fluid input channel and the fluid output channel; then vacuumize the reaction kettle and the injection module; During the experiment: first, heat the reactor to simulate the formation temperature, and then add the confining fluid through the confining fluid inlet to simulate the formation stress; when the pressure and temperature of the target layer are reached, the temperature-controllable permeation medium is added through the permeation medium inlet, and the permeation medium is selected according to the type of the experiment and is one or a mixture of more than one of gas, supercritical gas and liquid; at the same time, the immersed Raman probe is used to quantitatively analyze the change of solute composition in the core sample during the reaction process, the stereoscopic microscope is used to continuously observe the surface morphology change of the core sample during the reaction process, and the permeation medium after the reaction is collected and the gas and liquid phases are measured respectively, and the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected.

[0014] Preferably, the pressure difference is obtained by detecting the pressure of the permeation medium inlet and the permeation medium outlet , The pressure difference before and after the permeation medium passes through the core sample, i.e. the pressure difference before and after the reaction of the permeation medium, is obtained by correcting , The calculation formula of

[0015] Wherein, is the pressure drop generated by the core sample, is the pressure drop generated by the length of the fluid input channel and the fluid output channel in the experimental model, is the pressure drop generated by the cross section of the fluid input channel and the fluid output channel in the experimental model; Based on the Poiseuille flow of rectangular section, the calculation formula of is obtained by combining the Darcy formula

[0016] Wherein, is the length of the core sample, is the viscosity of the permeation medium, is the flow rate of the injected permeation medium, is the height of the core sample, is the width of the core sample; The relationship formula of

[0017] The relationship formula of

[0018] Wherein, is the distance between the microcolumns distributed in the core sample, The diameter of the micro-column distributed in the core sample is obtained by taking high-precision panoramic images of the core sample by a stereomicroscope and extracting and counting the micro-column by an image processor and ; The calculation formula of the value of

[0019] wherein, is the total length of the fluid input channel and the fluid output channel in the experimental model, is the flow rate of the fluid; The calculation formula of the value of

[0020] wherein, is the density of the permeable medium, is the cross-sectional area of the core sample, is the cross-sectional area of the fluid input channel and the fluid output channel in the experimental model.

[0021] Preferably, when the surface morphology change in the core sample reaction process is continuously observed by the stereomicroscope, the image is processed and the saturation and the refractive index of the fluid in the reaction process are calculated: If the liquid is injected first and then the gas, the liquid saturation and the gas saturation vary with time and position as:

[0022]

[0023] wherein, is the MRI signal intensity at time and point , is the initial MRI signal intensity at point , is the initial liquid saturation before the gas is injected, which is calculated by the signal intensity ratio of the MRI grayscale image; If the gas is injected first and then the liquid, the gas saturation and the liquid saturation vary with time and position as:

[0024]

[0025] wherein, is the initial gas saturation before the liquid is injected, which is calculated by the signal intensity ratio of the MRI gray image; The refractive index calculation formula is

[0026] wherein, is the refractive index at time and point , and is the baseline coefficient, is the sensitivity of the RID detector in the body microscope, is the molar solute concentration at time and point ; has

[0027] wherein, is the mass of the gas dissolved in the fluid; is the permeability of the core sample; is the length of the core sample; is the flow rate of the fluid; has

[0028] wherein, is the distance between the microcolumns distributed in the core sample, is the diameter of the microcolumns distributed in the core sample, which is obtained by taking a high-precision panoramic image of the core sample by the stereomicroscope and extracting and counting the microcolumns by the image processor and .

[0029] Preferably, in the high-temperature and high-pressure microcosmic visual Raman reaction experiment of the permeation medium-rock reaction, after the pressure and temperature of the target layer are reached, one of the gas, supercritical gas and liquid is selected as a single-phase permeation medium, or a plurality of the gas, supercritical gas and liquid are selected as a multi-phase permeation medium, the pressure of the permeation medium is adjusted first, then the permeation medium is heated, after the temperature and pressure of the permeation medium are constant, the permeation medium is transported to the core sample through the permeation medium inlet, so that the permeation medium permeates through the core sample, at the same time, the solute composition change in the core sample reaction process is quantitatively analyzed by using the immersion Raman probe, the surface morphology change in the core sample reaction process is continuously microscopically observed by using the stereomicroscope, the permeation medium after the reaction is collected and the gas phase and liquid phase are respectively metered, the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, and the permeation medium-rock reaction data are obtained.

[0030] Preferably, when the single-phase permeation experiment under high temperature and high pressure is carried out: after the pressure and temperature of the target layer are reached, one of the gas, supercritical gas and liquid is selected as the single-phase permeation medium, the pressure of the permeation medium is adjusted, the permeation medium is heated, after the temperature and pressure of the permeation medium are constant, the permeation medium is transported to the core sample through the permeation medium inlet, so that the permeation medium permeates through the core, at the same time, the immersed Raman probe is used to quantitatively analyze the solute composition change in the reaction process of the core sample, the stereoscopic microscope is used to continuously microscopically observe the surface morphology change in the reaction process of the core sample, the permeation medium after the reaction is collected and the gas phase and liquid phase are respectively metered, the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, and the single-phase permeation data are obtained.

[0031] Preferably, when the multi-phase displacement experiment under high temperature and high pressure is carried out: after the pressure and temperature of the target layer are reached, one of the gas, supercritical gas and liquid is selected as the single-phase preceding permeation medium, the pressure of the preceding permeation medium is adjusted, the preceding permeation medium is heated, after the temperature and pressure of the preceding permeation medium are constant, the preceding permeation medium is transported to the core sample through the permeation medium inlet, so that the preceding permeation medium permeates through the core, then another one of the gas, supercritical gas and liquid is selected as the single-phase subsequent permeation medium, the pressure of the subsequent permeation medium is adjusted, the subsequent permeation medium is heated, after the temperature and pressure of the subsequent permeation medium are constant, the subsequent permeation medium is transported to the core sample through the permeation medium inlet, so that the subsequent permeation medium displaces the preceding permeation medium, at the same time, the immersed Raman probe is used to quantitatively analyze the solute composition change in the reaction process of the core sample, the stereoscopic microscope is used to continuously microscopically observe the surface morphology change in the reaction process of the core sample, the permeation medium after the reaction is collected and the gas phase and liquid phase are respectively metered, the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, and the multi-phase displacement data are obtained.

[0032] The present application has the following beneficial effects: The present application can quantitatively analyze the solute composition change in the reaction process of the core sample, can continuously microscopically observe the surface morphology change in the reaction process of the core sample, the permeation medium is one or a mixture of multiple of the gas, supercritical gas and liquid, can meet the injection of most fluid media under high temperature and high pressure environment, and can carry out various experiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0034] Figure 1is a structural schematic diagram of a high-temperature and high-pressure micro-visualization Raman reaction experimental device in the present application.

[0035] Figure 2 is an installation schematic diagram of a reaction kettle, an experimental model and a temperature control module in the present application.

[0036] Figure 3 is a top view of a core sample, a fluid input channel and a fluid output channel in the present application.

[0037] In the figure: 11-experimental model; 11a-core sample; 11b-upper transparent plate; 11c-lower transparent plate; 11d-fluid input channel; 11e-fluid output channel; 12-reaction kettle; 12a-intermediate cylinder; 12b-upper end cover; 12c-lower end cover; 12d-viewing window; 12e-confining fluid inlet; 12f-confining fluid outlet; 12g-permeation medium inlet; 12h-permeation medium outlet; 12i-submerged Raman probe; 12j-Raman spectrum analyzer; 12k-sealing ring; 12l-structure for positioning and fixing the experimental model; 13a-stereomicroscope; 13b-image processor; 13c-lifting platform; 13d-moving platform; 21a-electric heating rod; 21b-electric heating jacket; 22a-confining fluid container; 22b-confining fluid tracking pump; 22c-back pressure valve; 22d-back pressure tracking pump; 22e-recovery container; 31a-gas container one; 31b-inlet pressure regulating valve one; 31c-safety valve one; 31d-gas booster pump; 31e-air compressor; 31f-solenoid valve; 31g-gas storage pressure container; 31h-gas flow controller one; 31i-gas container two; 31j-inlet pressure regulating valve two; 31k-safety valve two; 31l-gas flow controller two; 31m-high and low temperature constant temperature bath; 31n-constant speed and constant pressure pump; 31o-liquid container; 31p-steam generator; 31q-intermediate pressure container; 31r-mixing tank; 32a-gas-liquid separator; 32b-liquid meter; 32c-dryer; 32d-gas meter; 41-vacuum container; 42-vacuum pump; 5-data acquisition and processing system; 5a-pressure difference transmitter. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0039] It should be noted that the illustrations provided in the embodiments of the present invention are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0040] In this invention, it should also be noted that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "XXX-" and "XXX-" are used only for descriptive and distinguishing purposes, and should not be construed as indicating or implying relative importance.

[0041] The present application will be further described below with reference to the accompanying drawings and embodiments. Example 1 This embodiment discloses a high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus, such as... Figure 1 As shown, it includes a visualization experimental system, an environmental control system, a permeation system, a vacuum system, and a data acquisition and processing system.

[0042] About the visualization experiment system: like Figure 1 As shown, the visualization experimental system includes experimental model 11, reaction vessel 12, and observation module; wherein: as Figures 1 to 3 As shown, the experimental model 11 includes a thin-sheet core sample 11a and an upper transparent plate 11b and a lower transparent plate 11c sandwiched between the two sides of the core sample 11a and sealed with sealant. The core sample 11a on the experimental model 11 has a fluid inlet channel 11d and a fluid outlet channel 11e at both ends. Figure 1 and Figure 2 As shown, the experimental model 11 is positioned and fixed inside the reactor 12. The reactor 12 is equipped with an observation window 12d, a confining pressure fluid inlet 12e, a confining pressure fluid outlet 12f, a permeation medium inlet 12g, a permeation medium outlet 12g, and an immersion Raman probe 12i. After the experimental model 11 is positioned and fixed, the permeation medium inlet 12g and the permeation medium outlet 12h are respectively connected to the fluid input channel 11d and the fluid output channel 11e. The immersion Raman probe 12i is electrically connected to the Raman spectrometer 12j to quantitatively analyze the changes in solute composition during the reaction process of the core sample 11a; for example... Figure 1As shown, the observation module includes a stereomicroscope 13a capable of observing the core sample 11a through the observation window 11d, and the stereomicroscope 13a is electrically connected to an image processor 13b for continuous microscopic observation of the surface morphology of the core sample 11a during the reaction process.

[0043] In this embodiment, preferably: as Figure 1 As shown, the observation module further includes a moving platform 13d for moving the reactor 12 and a lifting platform 13c for lifting the stereomicroscope 13a, and through the linkage of the moving platform 13d and the lifting platform 13c, all areas of the core sample 11a can be clearly and dynamically photographed, so as to record the reaction and seepage dynamic phenomena of different areas of the core sample 11a in real time.

[0044] In this embodiment, preferably: as Figure 2 As shown, the main structure of the reactor 12 includes an intermediate cylinder 12a, an upper end cover 12b and a lower end cover 12c sealingly installed at both ends of the intermediate cylinder 12a; an observation window 12d is fitted and installed in a wedge-shaped hole of a sealing ring 12k through its wedge-shaped outer circle, the sealing ring 12k is installed on the upper end cover 12b and the lower end cover 12c respectively, and the wide end of the observation window 12d is axially limited; a confining pressure fluid inlet 12e, a confining pressure fluid outlet 12f, a permeation medium inlet 12g, a permeation medium outlet 12h and a submerged Raman probe 12i are threadedly installed on the intermediate cylinder 12a and sealed by a sealing ring; the lower end cover 12c is provided with a structure 12l for positioning and fixing the experimental model.

[0045] In this embodiment, preferably: as Figure 2 As shown, the fluid input channel 11d and the fluid output channel 11e are etched and formed, and the outer interfaces of the fluid input channel 11d and the fluid output channel 11e are provided on the bottom surface of the lower transparent plate 11c; after the experimental model 11 is positioned and fixed, the permeation medium inlet 12g is connected to the fluid input channel 11d through the connecting channels on the intermediate cylinder 12a and the lower end cover 12c in sequence, and the permeation medium outlet 12h is connected to the fluid output channel 11e through the connecting channels on the intermediate cylinder 11a and the lower end cover 11c in sequence.

[0046] In this embodiment, preferably: the observation window 11d is made of sapphire glass or quartz glass, and the upper transparent plate 11b and the lower transparent plate 11b are made of flat glass resistant to high temperature and high pressure.

[0047] Regarding the environmental control system: The environmental control system includes a temperature control module and a pressure control module; wherein: the temperature control module is used for heating the reactor 12 to simulate the formation temperature; the pressure control module is used for pressurizing and delivering confining pressure fluid into the reactor 12 through the confining pressure fluid inlet 12e and setting back pressure at the confining pressure fluid outlet 12f to simulate the formation stress.

[0048] In this embodiment, preferably: Figure 2 As shown, the temperature control module includes an electric heating rod 21a embedded in the reactor 12 and an electric heating sleeve 21b fitted over the reactor 12. The electric heating rod 21a can quickly heat the reactor 12, while the electric heating sleeve 21b serves to preheat and maintain the temperature. Figure 1 As shown, the pressure control module includes a confining pressure fluid container 22a, a confining pressure tracking pump 22b, a back pressure valve 22c, a back pressure tracking pump 22d, and a recovery container 22e. The confining pressure fluid container 22a, the confining pressure tracking pump 22b, and the confining pressure fluid inlet 12e are connected in sequence through pipelines. The confining pressure fluid outlet 12f, the back pressure valve 22c, the back pressure tracking pump 22d, and the recovery container 22e are connected in sequence through pipelines. The confining pressure tracking pump 22b is used to regulate the confining pressure, and the back pressure valve 22c and the back pressure tracking pump 22d are used to regulate the back pressure to make the outflowing liquid stable and prevent evaporation.

[0049] Regarding the penetration system: The permeation system includes an injection module and a collection and metering module; wherein: the injection module is used to pressurize and deliver a temperature-controlled permeation medium to the core sample 11a through the permeation medium inlet 12g, the permeation medium being one or more of gas, supercritical gas, and liquid; the collection and metering module is used to collect the permeation medium after the reaction through the permeation medium outlet 12h and meter the gas phase and liquid phase respectively.

[0050] In this embodiment, preferably: Figure 1 As shown, the injection module includes a gas container 31a, a gas container 31i, a liquid container 31o, and a mixing tank 31r. The gas container 31a passes through an inlet pressure regulating valve 31b, a safety valve 31c, a gas booster pump 31d (powered by an air compressor 31e in conjunction with a solenoid valve 31f), a gas storage pressure vessel 31g, and a gas flow controller 31h, and is then divided into two paths: one path connects to the mixing tank 31r, and the other path connects to the permeate medium inlet 12g. Gas container 2 31i is connected to constant speed and pressure pump 31n via inlet pressure regulating valve 2 31j, safety valve 2 31k, gas flow controller 2 31l, and high and low temperature constant temperature bath 31m. Liquid container 310 is connected to constant speed and pressure pump 31n. Constant speed and pressure pump 31n is divided into two paths after passing through parallel steam generator 31p and several intermediate pressure vessels 31q. One path is connected to mixing tank 31r, and the other path is connected to permeate medium inlet 12g. Mixing tank 31r is connected to permeate medium inlet 12g. By connecting different pipelines and valves, one of gas, supercritical gas, and liquid can be introduced individually, or a mixture of multiple gases, supercritical gases, and liquids can be introduced. Mixing tank 31r plays a mixing role, steam generator 31p plays a role in heating permeate medium, and gas in gas container 2 31i can be used to prepare supercritical gas after being heated by high and low temperature constant temperature bath 31m and pressurized by constant speed and pressure pump 31n.

[0051] In the embodiment, preferably, the intermediate pressure vessel 31q, the steam generator 31p, the gas storage pressure vessel 31g, the mixing tank 31r and the reactor 12 are made of corrosion-resistant materials, such as Hastelloy material, 316L stainless steel and 2205 duplex stainless steel, which can adapt to various strong acid and strong alkaline penetrating media.

[0052] In the embodiment, preferably, the gas container one 31a and the gas container two 31i are installed in the electrostatic grounding explosion-proof box.

[0053] In the embodiment, preferably, as shown in Figure 1 the collection metering module includes a gas-liquid separator 32a connected with the penetrating medium outlet 12h, a liquid meter 32b connected with the liquid outlet of the gas-liquid separator 32a, a dryer 32c connected with the gas outlet of the gas-liquid separator 32a, and a gas meter 32d connected with the dryer 32c.

[0054] Regarding the vacuum system: The vacuum system is used to vacuumize the reactor 12 and the injection module before the experiment.

[0055] In the embodiment, preferably, as shown in Figure 1 the vacuum system includes a vacuum container 42 and a vacuum pump 41 connected with the reactor 12 and the injection module through pipelines.

[0056] Regarding the data acquisition and processing system: The data acquisition and processing system 5 is used to acquire and process the data 13a of the immersed Raman probe 12i and the stereoscopic microscope, the temperature and pressure in the reactor 12, the pressure, temperature and pH value of the penetrating medium before and after the reaction, and store them.

[0057] The application can quantitatively analyze the solute composition change in the reaction process of the core sample, continuously microscopically observe the surface morphology change in the reaction process of the core sample 11a, and meet the injection of most fluid media under high temperature and high pressure environment, and can carry out various experiments.

[0058] Embodiment two The embodiment discloses a high-temperature and high-pressure micro-visualization Raman reaction experiment method based on the above high-temperature and high-pressure micro-visualization Raman reaction experiment device: S1, before the experiment: First, the core sample 11a of the drilling target layer is selected and processed into a thin slice with appropriate size, an experimental model is prepared and fluid input channel 11d and fluid output channel 11e are obtained, the experimental model 11 is positioned and fixed in the reaction kettle 12, and the permeation medium inlet 12g and the permeation medium outlet 12h are respectively connected to the fluid input channel 11d and the fluid output channel 11e; then the reaction kettle 12 and the injection module are vacuumized.

[0059] S2, during the experiment: First, the reaction kettle 12 is heated to simulate the formation temperature, the confining fluid is pressurized and transported into the reaction kettle 12 through the confining fluid inlet 12e, and the back pressure is set at the confining fluid outlet 12f to simulate the formation stress; after reaching the pressure and temperature of the target layer, the temperature-controllable permeation medium is pressurized and transported into the core sample 11a through the permeation medium inlet 12g, the permeation medium is selected according to the type of experiment and is one or more mixtures of gas, supercritical gas and liquid, at the same time, the solute composition change in the core sample 11a during the reaction process is quantitatively analyzed by using the immersion Raman probe 12i, the surface morphology change in the core sample 11a during the reaction process is continuously observed by using the stereomicroscope 13a, the permeation medium after the reaction is collected and the gas and liquid phases are respectively measured, and the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected.

[0060] Among them: When performing a high-temperature and high-pressure permeation medium-rock reaction micro-visual Raman reaction experiment: after reaching the pressure and temperature of the target layer, one of the gas, supercritical gas and liquid is selected as a single-phase permeation medium, or a plurality of mixtures of the gas, supercritical gas and liquid are selected as a multi-phase permeation medium, the pressure of the permeation medium is first adjusted, then the permeation medium is heated, after the temperature and pressure of the permeation medium are constant, the permeation medium is transported to the core sample 11a through the permeation medium inlet 11g, so that the permeation medium permeates through the core sample, at the same time, the solute composition change in the core sample 11a during the reaction process is quantitatively analyzed by using the immersion Raman probe 12i, the surface morphology change in the core sample 11a during the reaction process is continuously observed by using the stereomicroscope 13a, the permeation medium after the reaction is collected and the gas and liquid phases are respectively measured, and the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, and the permeation medium-rock reaction data are obtained.

[0061] When the single-phase permeation experiment under high temperature and high pressure is performed: after the pressure and temperature of the target layer are reached, one of the gas, supercritical gas and liquid is selected as the single-phase permeation medium, the pressure of the permeation medium is adjusted, the permeation medium is heated, after the temperature and pressure of the permeation medium are constant, the permeation medium is delivered to the core sample 11a through the permeation medium inlet 11g, so that the permeation medium permeates through the core, at the same time, the quantitative analysis of the solute composition change in the reaction process of the core sample 11a is performed by using the immersion Raman probe 12i, the surface morphology change in the reaction process of the core sample 11a is continuously observed by using the stereomicroscope 13a, the permeation medium after the reaction is collected and the gas phase and liquid phase are respectively measured, the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, and the single-phase permeation data are obtained.

[0062] When the multi-phase displacement experiment under high temperature and high pressure is performed: after the pressure and temperature of the target layer are reached, one of the gas, supercritical gas and liquid is selected as the single-phase pre-permeation medium, the pressure of the pre-permeation medium is adjusted, the pre-permeation medium is heated, after the temperature and pressure of the pre-permeation medium are constant, the pre-permeation medium is delivered to the core sample 11a through the permeation medium inlet 11g, so that the pre-permeation medium permeates through the core, then another one of the gas, supercritical gas and liquid is selected as the single-phase post-permeation medium, the pressure of the post-permeation medium is adjusted, the post-permeation medium is heated, after the temperature and pressure of the post-permeation medium are constant, the post-permeation medium is delivered to the core sample 11a through the permeation medium inlet 11g, so that the post-permeation medium displaces the pre-permeation medium, at the same time, the quantitative analysis of the solute composition change in the reaction process of the core sample 11a is performed by using the immersion Raman probe 12i, the surface morphology change in the reaction process of the core sample 11a is continuously observed by using the stereomicroscope 13a, the permeation medium after the reaction is collected and the gas phase and liquid phase are respectively measured, the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, the pressure and pressure difference, temperature and pH value before and after the reaction of the permeation medium are collected, and the multi-phase displacement data are obtained.

[0063] S3、After the experiment: Gradually reduce the temperature and pressure, and recycle the confining fluid and the permeation medium.

[0064] The pressure difference is obtained by detecting the pressures of the permeation medium inlet 12g and the permeation medium outlet 12h (The pressure difference is directly obtained by setting the pressure difference transmitter 5a, or the pressure difference is calculated by respectively setting the pressure sensors), the pressure difference is corrected to obtain the pressure difference of the permeation medium before and after passing through the core sample 11a, i.e. the pressure difference of the permeation medium before and after the reaction , The calculation formula of the pressure difference of the permeation medium before and after the reaction is ​

[0065] wherein, is the pressure drop generated for the core sample 11a, is the pressure drop generated in length for the fluid input channel 11d and the fluid output channel 11e within the experimental model 11, is the pressure drop generated in cross section for the fluid input channel 11d and the fluid output channel 11e within the experimental model 11; Based on Poiseuille flow of rectangular section, combined with Darcy formula, the calculation formula of is

[0066] wherein, is the length of the core sample 11a, is the viscosity of the permeating medium, is the flow rate of the permeating medium injected, is the height of the core sample 11a, is the width of the core sample 11a; The relationship formula of

[0067] The relationship formula of

[0068] wherein, is the distance between the micro columns distributed in the core sample 11a, is the diameter of the micro columns distributed in the core sample 11a, a high-precision panoramic image of the core sample 11a is taken by the stereomicroscope 13a, and the micro columns are extracted and counted by the image processor 13b to obtain the value of and The calculation formula of

[0069] wherein, is the total length of the fluid input channel 11d and the fluid output channel 11e within the experimental model 11, is the flow rate of the fluid; The calculation formula of

[0070] wherein, is the density of the permeating medium, is the cross-sectional area of the core sample 11a, ​The cross-sectional area of the fluid input channel 11d and the fluid output channel 11e in the experimental model 11.

[0071] When the surface morphology of the core sample 11a during the reaction process is continuously observed microscopically using the stereomicroscope 13a, the saturation and the refractive index of the fluid during the reaction process are also processed and calculated: If the liquid is injected first and then the gas, the liquid saturation and the gas saturation vary with time and position as follows:

[0072]

[0073] wherein, is the MRI signal intensity at time and point , is the initial MRI signal intensity at point , is the initial liquid saturation before the gas is injected, which is calculated by the signal intensity ratio of the MRI grayscale image; If the gas is injected first and then the liquid, the gas saturation and the liquid saturation vary with time and position as follows:

[0074]

[0075] wherein, is the initial gas saturation before the liquid is injected, which is calculated by the signal intensity ratio of the MRI grayscale image; The refractive index calculation formula is

[0076] wherein, is the refractive index at time and point , and are baseline coefficients, is the sensitivity of the RID detector in the stereomicroscope, is the molar solute concentration at time and point ; There are

[0077] wherein, is the mass of the gas dissolved in the fluid; is the permeability of the core sample 11a; is the length of the core sample 11a; is the flow rate of the fluid; has

[0078] wherein, is the distance between the micro-pillars distributed in the core sample 11a, is the diameter of the micro-pillars distributed in the core sample 11a, a high-precision panoramic image of the core sample 11a is taken by the stereomicroscope 13a, and the micro-pillars are extracted and counted by the image processor 13b and the value of.

[0079] Application Example The following experiment will now be carried out: the sample target formation temperature is 110°C, the confining pressure is 45MPa, and the CO2+O2-water-sandstone reaction micro-visual Raman reaction experiment under high temperature and high pressure is carried out. Among them: The core sample 11a parameters are: material: sandstone; size: 70mm x 140mm.

[0080] The parameters of the reaction kettle 12 are: material: hastelloy; design pressure: 75MPa; working pressure range: 0-75MPa; design temperature: 200°C; working temperature range: -20°C~200°C; observation window 12d narrow end diameter: 60mm.

[0081] The parameters of the immersion Raman probe 12i are: probe size: diameter 32mm, length 114mm; excitation wavelength: 785±0.5nm, line width 0.08nm; spectral range: 200cm~3000cm -1 ; optical fiber type: 105μm, NA=0.22; operating temperature: including 0°C~325°C; operating pressure: including 0-68MPa.

[0082] The following steps are adopted: 1), select the sandstone sample of the drilling target formation and process it into a thin slice with appropriate size, prepare the experimental model 11 and obtain the fluid input channel 11d and the fluid output channel 11e, position and fix the experimental model 11 in the reaction kettle 12, so that the permeation medium inlet 12g and the permeation medium outlet 12h are respectively connected to the fluid input channel 11d and the fluid output channel 11e.

[0083] 2), use the vacuum system to vacuum the reaction kettle 12 and the injection module.

[0084] 3) First heat the reactor 12 to simulate the formation temperature, through the confining fluid inlet 12e to the reactor 12 pressurized delivery confining fluid and back pressure at the confining fluid outlet 12f set to simulate the formation stress; 4) After reaching the target layer pressure and temperature, open the injection module CO2, O2, water delivery mechanism, O2 through the gas booster pump 31d, gas storage pressure vessel 31g into the mixing tank 31r, CO2, water through the constant speed constant pressure pump 31n to 0.001~0.005mL / min flow rate into the mixing tank 31r, close the valve, quantitative CO2, O2, water in the mixing tank 31r is mixed for about 1~3h, and combined with the research area hot fluid temperature range, using steam generator 31p mixed gas liquid heating to 100℃.

[0085] 5) Using constant speed constant pressure pump 31n to mix the gas liquid mixture in the tank 31r through the permeable medium inlet 12g to the sandstone sample delivery, lasting 4~12 hours.

[0086] 6) In the process of high temperature and high pressure CO2+O2-water-sandstone reaction, using the immersed Raman probe 12i quantitative analysis of solute composition change in the process of sandstone sample reaction, using the stereoscopic microscope 13a continuous microscopic observation of surface morphology change in the process of sandstone sample reaction, collection of permeable medium and respectively metering gas and liquid, collection of permeable medium before and after the reaction pressure and differential pressure, temperature and pH value.

[0087] 7) After the high temperature and high pressure CO2+O2-water-sandstone reaction, gradually cooling, decompression, confining fluid and permeable medium recycling, take out the experimental model 11, close the power of each device.

[0088] The above described embodiments are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application.

Claims

1. A high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus, characterized in that, include: The visualization experimental system includes an experimental model, a reaction vessel, and an observation module. The experimental model includes a thin-slice core sample and upper and lower transparent plates sandwiched between the two sides of the core sample and sealed with sealant. Fluid input and output channels are located at both ends of the core sample on the experimental model. The reaction vessel can position and fix the experimental model. The reaction vessel is equipped with an observation window, a confining pressure fluid inlet, a confining pressure fluid outlet, a permeate medium inlet, a permeate medium outlet, and an immersion Raman probe. After the experimental model is positioned and fixed, the permeate medium inlet and outlet are connected to the fluid input and output channels, respectively. The immersion Raman probe is electrically connected to a Raman spectrometer to quantitatively analyze changes in solute composition during the core sample reaction process. The observation module includes a stereomicroscope that allows observation of the core sample through the observation window. The stereomicroscope is electrically connected to an image processor to continuously observe the surface morphology changes of the core sample during the reaction process. The environmental control system includes a temperature control module and a pressure control module; the temperature control module is used to heat the reactor to simulate formation temperature; the pressure control module is used to pressurize and deliver confining fluid into the reactor through the confining fluid inlet and set back pressure at the confining fluid outlet to simulate formation stress. The infiltration system includes an injection module and a collection and metering module; The injection module is used to pressurize and deliver a temperature-controlled permeation medium to the core sample through the permeation medium inlet. The permeation medium can be one or more of the following: gas, supercritical gas, and liquid. The collection and metering module is used to collect the permeate after the reaction through the permeate outlet and to meter the gas and liquid phases separately. A vacuum system is used to evacuate the reaction vessel and injection module before the experiment; The data acquisition and processing system is used to acquire data from the immersion Raman probe and stereomicroscope, the temperature and pressure inside the reactor, the pressure and pressure difference, temperature and pH value of the permeation medium before and after the reaction, and to store and process the data.

2. The high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus as described in claim 1, characterized in that: The observation module also includes a moving platform for moving the reaction vessel and a lifting platform for raising and lowering the stereomicroscope.

3. The high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus as described in claim 1, characterized in that: The main structure of the reactor includes an intermediate cylinder and upper and lower end covers that are sealed at both ends of the intermediate cylinder. The observation window is installed in the wedge-shaped hole of the sealing ring through its own wedge-shaped outer circle. The sealing ring is installed on the upper and lower end covers respectively, and the wide end of the observation window is axially limited. The confining pressure fluid inlet, confining pressure fluid outlet, permeate medium inlet, permeate medium outlet and immersion Raman probe are threaded on the intermediate cylinder and sealed by sealing rings. The lower end cover is provided with a structure for positioning and fixing the experimental model.

4. The high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus as described in claim 3, characterized in that: The fluid input channel and fluid output channel are etched and shaped. The external interfaces of the fluid input channel and fluid output channel are both located on the bottom surface of the lower transparent plate. After the experimental model is positioned and fixed, the inlet of the permeation medium is connected to the fluid input channel through the connecting channels on the intermediate cylinder and the lower end cover in sequence, and the outlet of the permeation medium is connected to the fluid output channel through the connecting channels on the intermediate cylinder and the lower end cover in sequence.

5. The high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus as described in claim 1, characterized in that: The temperature control module includes an electric heating rod embedded in the reactor and an electric heating jacket fitted over the reactor; the pressure control module includes a confining pressure fluid container, a confining pressure tracking pump, a back pressure valve, a back pressure tracking pump, and a recovery container. The confining pressure fluid container, the confining pressure tracking pump, and the confining pressure fluid inlet are connected in sequence through pipelines, and the confining pressure fluid outlet, the back pressure valve, the back pressure tracking pump, and the recovery container are connected in sequence through pipelines.

6. The high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus as described in claim 1, characterized in that: The injection module includes a gas container one, a gas container two, a liquid container, and a mixing tank. Gas container one is divided into two paths after passing through an inlet pressure regulating valve one, a safety valve one, a gas booster pump, a gas storage pressure vessel, and a gas flow controller one. One path connects to the mixing tank, and the other path connects to the permeate inlet. Gas container two is connected to a constant speed and constant pressure pump after passing through an inlet pressure regulating valve two, a safety valve two, a gas flow controller two, and a high-low temperature constant temperature bath. The liquid container is connected to the constant speed and constant pressure pump. The constant speed and constant pressure pump is divided into two paths after passing through parallel steam generators and several intermediate pressure vessels. One path connects to the mixing tank, and the other path connects to the permeate inlet. The mixing tank is connected to the permeate inlet.

7. The high-temperature, high-pressure microscopic visualization Raman reaction experimental apparatus as described in claim 6, characterized in that: Intermediate pressure vessels, steam generators, gas storage pressure vessels, mixing tanks, and reaction vessels are made of corrosion-resistant materials.

8. A high-temperature, high-pressure microscopic visualization Raman reaction experimental method, characterized in that, Based on the high-temperature and high-pressure microscopic visualization Raman reaction experimental apparatus as described in any one of claims 1 to 7: Before the experiment: Select core samples from the target stratum of the borehole and process them into thin slices of appropriate size. Prepare the experimental model and obtain the fluid input channel and fluid output channel. Position and fix the experimental model in the reactor, and connect the inlet and outlet of the permeate medium to the fluid input channel and fluid output channel, respectively. Then, evacuate the reactor and injection module. During the experiment: the reactor was first heated to simulate formation temperature. Confining fluid was pressurized and supplied into the reactor through the confining fluid inlet, and back pressure was set at the confining fluid outlet to simulate formation stress. After the pressure and temperature of the target layer were reached, a temperature-controlled permeable medium was pressurized and supplied to the core sample through the permeable medium inlet. The permeable medium was selected according to the experimental type and was one or more of gas, supercritical gas, and liquid. At the same time, the changes in solute composition of the core sample during the reaction process were quantitatively analyzed using an immersion Raman probe. The changes in surface morphology of the core sample during the reaction process were continuously observed using a stereomicroscope. The permeable medium after the reaction was collected, and the gas phase and liquid phase were measured separately. The pressure, pressure difference, temperature, and pH value of the permeable medium before and after the reaction were collected.

9. The high-temperature, high-pressure microscopic visualization Raman reaction experimental method as described in claim 8, characterized in that: The pressure difference is obtained by detecting the pressure at the inlet and outlet of the permeate medium. ,right The pressure difference before and after the permeable medium passes through the core sample is obtained by making corrections; that is, the pressure difference before and after the permeable medium reacts. , The calculation formula is in, The pressure drop generated by the core sample. This introduces a pressure drop along the length of the fluid input and output channels within the experimental model. The pressure drop across the cross-section of the fluid input and output channels within the experimental model; Based on Poiseuille flow with a rectangular cross-section, and combined with Darcy's formula, we obtain... The calculation formula is in, The length of the core sample. The viscosity of the permeating medium, The flow rate of the injected permeating medium, The height of the core sample. The width of the core sample; The relation is: The relation is: in, This represents the distance between the micropillars distributed within the core sample. The diameter of the micropillars distributed in the core sample is obtained by capturing high-precision panoramic images of the core sample using a stereomicroscope, and then extracting and statistically analyzing the micropillars using an image processor. and The value; The calculation formula is in, This refers to the total length of the fluid input and output channels within the experimental model. The velocity of the fluid; The calculation formula is in, The density of the permeating medium, This represents the cross-sectional area of ​​the core sample. This represents the cross-sectional area of ​​the fluid input and output channels within the experimental model.

10. The high-temperature, high-pressure microscopic visualization Raman reaction experimental method as described in claim 8, characterized in that: When continuously observing the surface morphology changes of core samples during the reaction process using a stereomicroscope, the images are also processed and the fluid saturation and refractive index during the reaction process are calculated. If liquid is injected first and then gas is injected, the liquid saturation will be... and gas saturation The changes with time and location are as follows: in, It is in time and points MRI signal intensity at the location It is at point The initial MRI signal intensity, It is the initial liquid saturation before gas injection, calculated using the signal intensity ratio of the MRI grayscale image; If gas is injected first and then liquid is injected, the gas saturation will be... and liquid saturation The changes with time and location are as follows: in, It is the initial gas saturation before liquid injection, calculated from the signal intensity ratio of the MRI grayscale image; The formula for calculating refractive index is: in, It is in time and points The refractive index at that point, and It is the baseline coefficient. It refers to the sensitivity of the RID detector in a stereomicroscope. It is in time and points The molar concentration of solute at that location; have in, It is the mass of gas dissolved in the fluid; It is the permeability of the core sample; The length of the core sample; The velocity of the fluid; have in, This represents the distance between the micropillars distributed within the core sample. The diameter of the micropillars distributed in the core sample is obtained by capturing high-precision panoramic images of the core sample using a stereomicroscope, and then extracting and statistically analyzing the micropillars using an image processor. and The value of .

11. The high-temperature, high-pressure microscopic visualization Raman reaction experimental method as described in claim 8, characterized in that: When conducting microscopic Raman reaction experiments on permeable media-rock reactions under high temperature and high pressure: After reaching the pressure and temperature of the target stratum, one of the following is selected as the single-phase permeable medium: gas, supercritical gas, or liquid; or a mixture of multiple of these is selected as the multiphase permeable medium. The pressure of the permeable medium is first adjusted, and then the permeable medium is heated. After the temperature and pressure of the permeable medium are constant, it is transported to the core sample through the permeable medium inlet, allowing the permeable medium to permeate through the core. At the same time, the changes in solute composition during the reaction process of the core sample are quantitatively analyzed using an immersion Raman probe. The changes in surface morphology during the reaction process of the core sample are continuously observed using a stereomicroscope. The permeable medium after the reaction is collected, and the gas and liquid phases are measured separately. The pressure, pressure difference, temperature, and pH value of the permeable medium before and after the reaction are collected to obtain permeable medium-rock reaction data.

12. The high-temperature, high-pressure microscopic visualization Raman reaction experimental method as described in claim 8, characterized in that: When conducting single-phase permeation experiments under high temperature and high pressure: After reaching the pressure and temperature of the target stratum, one of the following is selected as the single-phase permeation medium: gas, supercritical gas, or liquid. The pressure of the permeation medium is first adjusted, and then the permeation medium is heated. After the temperature and pressure of the permeation medium are constant, it is transported to the core sample through the permeation medium inlet, allowing the permeation medium to permeate through the core. At the same time, the changes in solute composition during the reaction process of the core sample are quantitatively analyzed using an immersion Raman probe, and the changes in surface morphology of the core sample during the reaction process are continuously observed using a stereomicroscope. The permeation medium after the reaction is collected, and the gas phase and liquid phase are measured separately. The pressure, pressure difference, temperature, and pH value of the permeation medium before and after the reaction are collected to obtain single-phase permeation data.

13. The high-temperature, high-pressure microscopic visualization Raman reaction experimental method as described in claim 8, characterized in that: In high-temperature and high-pressure multiphase displacement experiments: after reaching the target stratum pressure and temperature, one of the following is selected as the single-phase primary permeation medium: gas, supercritical gas, or liquid. The pressure of the primary permeation medium is then adjusted, and it is heated. Once the temperature and pressure of the primary permeation medium are constant, it is transported to the core sample through the permeation medium inlet, allowing the primary permeation medium to permeate through the core. Then, another of the following is selected as the single-phase secondary permeation medium: gas, supercritical gas, or liquid. The pressure of the secondary permeation medium is then adjusted, and it is heated. Once the temperature and pressure of the secondary permeation medium are constant, it is transported to the core sample through the permeation medium inlet, allowing the secondary permeation medium to displace the primary permeation medium. Simultaneously, an immersion Raman probe is used to quantitatively analyze the changes in solute composition during the core sample reaction process. A stereomicroscope is used to continuously observe the changes in surface morphology of the core sample during the reaction process. The permeation medium after the reaction is collected, and the gas and liquid phases are measured separately. The pressure, pressure difference, temperature, and pH value of the permeation medium before and after the reaction are collected to obtain multiphase displacement data.

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