Capsule polymer controllable injection and in-situ viscosity enhancement and oil displacement experimental device and method

Abstract

The present invention relates to the technical field of oil and gas field development engineering, and discloses an experimental device and method for controllable injection and in-situ viscosity enhancement and oil displacement of capsule polymers. The experimental device includes a vacuum deoxygenation system, a fluid injection and pipeline transportation system, a micromodel constant temperature aging system, and a pressure monitoring and image acquisition system. The capsule polymer responds to temperature by releasing encapsulated polymer molecules to enhance aqueous phase viscosity. By adjusting the fluid injection and pipeline transportation system, the injection amount of the displacement agent can be precisely controlled. By adjusting the temperature and thermal aging time of the micromodel constant temperature system, monitoring the fluid injection pressure, and observing the oil-water distribution image within the micromodel, the viscosity enhancement performance and oil displacement characteristics of the capsule polymer under different conditions can be obtained in real time. This is of great significance for studying the microscopic oil displacement mechanism and enhanced oil recovery mechanism of the capsule polymer in the process of triggering viscosity enhancement within porous media.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development engineering, in particular to a capsule polymer controllable injection and in-situ viscosity-increasing oil displacement experimental device and method. Background Art

[0002] Polymer flooding is an important method for improving oilfield recovery. The addition of polymers increases aqueous viscosity and improves the water-to-oil mobility ratio. However, the injection process also faces challenges such as high injection pressures and severe viscosity shear loss. Encapsulated polymers encapsulate polymer chains within the capsule, preventing the polymer from releasing viscosity during the initial injection phase, thereby increasing the viscosity retention of the injected polymer solution. Within the reservoir, the encapsulated polymers react to temperature to trigger the release of polymer chains, enhancing the effectiveness of polymer flooding.

[0003] The process of capsule polymer-triggered viscosification in a reservoir involves a gradual transition from a discontinuous phase of granular flow to a continuous phase of non-Newtonian fluid. During this process, clogging of capsule particles, interaction between capsule particles and polymer, and aqueous phase viscosification all affect oil displacement. Therefore, the microscopic oil displacement mechanism of capsule polymer-triggered release is a worthy research topic. Currently, commonly used experimental methods for studying chemical micro-displacement include microfluidics, core-flooding CT scanning, and micro-etching model flooding. While microfluidics experiments offer high precision and micro-control, they typically have a small observation range and are typically conducted at room temperature. Core-flooding CT scanning allows for three-dimensional core observation and in situ viscosification, but they suffer from a limited scanning range, long experimental cycles, and high experimental costs. Micro-etching model flooding experiments offer a wide observation range and are well suited for studying the displacement mechanisms of different chemicals. However, they are currently typically conducted at room temperature, and residual fluid within the injection line is difficult to effectively drain, making it difficult to precisely control the injection volume of the displacing agent.

[0004] Therefore, in order to precisely control the injection amount of the displacing agent, more accurately study the oil displacement characteristics of capsule polymers in different viscosification processes of porous media, and clarify their oil displacement mechanism, an experimental device is needed that can visualize the in-situ triggered viscosification of capsule polymers inside porous media, and then clarify the viscosification performance and oil displacement mechanism of capsule polymers at different triggering stages. Summary of the Invention

[0005] In order to precisely control the injection amount of the displacement agent, more accurately study the oil displacement characteristics of different viscosity-increasing processes of capsule polymers in porous media, and clarify their microscopic oil displacement mechanism, the present invention has built a capsule polymer controllable injection and in-situ viscosity-increasing oil displacement experimental device based on conventional micro-etching model oil displacement experiments, including: a vacuum deoxygenation system, a fluid injection and pipeline transportation system, a micro-model constant temperature aging system, and a pressure monitoring and image acquisition system.

[0006] The vacuum deoxygenation system includes a vacuum pump, a vacuum tube, a safety bottle, a connecting pipeline and a vent valve, wherein the vacuum pump is connected to the safety bottle through the vacuum tube;

[0007] The fluid injection and pipeline transportation system includes a micro-injection pump A1, a micro-injection pump A3, a micro-intermediate container B1, a micro-intermediate container B2, a micro-intermediate container B3, a connecting pipeline, a back-pressure valve, a waste liquid collector A, a waste liquid collector B, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, and a tenth valve, wherein the intermediate container B1 and the intermediate container B2 are controlled by the micro-injection pump A1, and the micro-intermediate container B3 and the back-pressure valve are controlled by the micro-injection pump A3;

[0008] The micro-model constant temperature aging system includes a high-temperature and high-pressure visual reactor, a temperature probe, a water circulation heating device, a water circulation pipeline, a micro-injection pump A2, a base, a support frame, a rotating shaft, a hand crank handle, and a heat preservation sleeve. The high-temperature and high-pressure visual reactor is connected to the rotating shaft and fixed to the support frame. The high-temperature and high-pressure visual reactor is rotated by shaking the hand crank handle.

[0009] The pressure monitoring and image acquisition system includes a high-precision pressure sensor C1, a high-precision pressure sensor C2, a microscope, and a computer. The high-precision pressure sensor C1 is located between the fourth valve 304 and the fifth valve 305, and the high-precision pressure sensor C2 is located between the seventh valve 307 and the back pressure valve.

[0010] In one embodiment, the high-temperature and high-pressure visualization reactor includes a reactor shell, a reactor cover, a water circulation interface, an injection end interface, a discharge end interface, a gasket, a micromodel, a micromodel position fixture, a pressing piece, a fastening resin bolt, a bolt, a confining pressure injection port, a temperature probe interface, a first high-pressure glass, and a second high-pressure glass, wherein the micromodel is fixed by the micromodel position fixture, a gasket is placed underneath to contact the reactor shell, and the micromodel is clamped and pressed by the pressing piece, the fastening resin bolt, and the bolt.

[0011] In one embodiment, there are two injection end interfaces, which are commonly connected to the inlet end of the micromodel; there are two discharge end interfaces, which are commonly connected to the outlet end of the micromodel.

[0012] In one embodiment, the high-temperature and high-pressure visualization reactor has a confining pressure chamber and a water circulation chamber inside, wherein the confining pressure chamber is connected to the micro-injection pump A2 to provide confining pressure conditions for the micromodel, and the water circulation chamber is connected to the water circulation heating device through a water circulation pipeline to provide a temperature environment for the micromodel.

[0013] In one embodiment, the micro-injection pump A1, micro-injection pump A2, and micro-injection pump A3 are constant pressure and constant flow rate injection pumps, with a constant pressure adjustable range of 0-70 MPa, an accuracy of 0.25%, and a flow rate range of 0.001-50 ml / min.

[0014] In one embodiment, the volume range of the micro intermediate container B1, the micro intermediate container B2, and the micro intermediate container B3 is 30-100 ml, and the maximum pressure resistance is 50 MPa.

[0015] In one embodiment, the temperature of the water circulation heating device is adjustable in a range of 0-95°C with an accuracy of ±0.5°C, wherein distilled water is contained in the water circulation heating device.

[0016] In one embodiment, the high-temperature and high-pressure visualization reactor has a pressure resistance of 50 MPa and an etching diameter range of 80 mm.

[0017] In one embodiment, the micromodel is made of square heat-resistant and pressure-resistant glass with a thickness of 0.8 cm. The interior has an independently designed pore network structure, and the internal etching model size is 40 mm × 40 mm.

[0018] In one embodiment, the connecting pipeline is made of 316 or 316L material, and the pipeline valve is made of 316L material.

[0019] According to a first aspect of the disclosed embodiments of the present invention, an experimental method applicable to the above-mentioned capsule polymer controllable injection and in-situ viscosity enhancement and oil displacement experimental device is provided, characterized in that the method comprises:

[0020] Step 1: By adjusting the closure of the valves in the fluid injection and pipeline transport system and cooperating with the high-temperature and high-pressure visual reactor rotation device, the residual fluid in the pipeline can be discharged to achieve controllable injection of the displacement agent;

[0021] Step 2: By adjusting the injection pressure of the micro-injection pump A2 and setting the temperature of the water circulation heating device (17), the temperature and pressure environment under reservoir conditions can be simulated, and a high-temperature and high-pressure visual reactor is used to realize a visualization study of the viscosity enhancement and oil displacement triggered by the capsule polymer inside the porous medium.

[0022] Beneficial effects

[0023] The present invention provides a device and method for controlling the injection of capsule polymers and in-situ viscosity-enhancing oil displacement experiments, which have the following beneficial effects:

[0024] (1) The experimental device can provide the temperature and pressure environment required for the capsule polymer to trigger viscosity increase inside the porous medium, and can visualize the viscosity increase process of the capsule polymer and study the oil displacement characteristics of the capsule polymer at different aging times in real time.

[0025] (2) The injection volume of different fluids inside the micromodel can be precisely controlled, solving the problem of the inability to accurately control the injection volume of the target fluid due to interference from irrelevant fluids inside the connecting pipeline.

[0026] (3) The high-precision pressure sensor can monitor the pressure changes of the injected fluid inside the micromodel in real time, providing an effective means of distinguishing the changes in the viscosity-increasing properties of the capsule polymer.

[0027] (4) The micromodel used in the experiment has a larger observation field of view, which makes the oil displacement performance research more accurate. It is also easy to clean and can be reused, which reduces the experimental cost.

[0028] (5) The experiment uses a water circulation heating device, which makes the experimental process safer and the temperature of the constant temperature system is maintained more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the experimental device for visually studying the oil displacement performance of capsule polymers according to the present invention

[0030] Figure 2 Schematic diagram of the internal structure of the high-temperature and high-pressure visual reactor of the present invention

[0031] Figure 3 Inverted image for HPHT visualization

[0032] Figure 4 Bottom view of the high-temperature and high-pressure visualization reactor experimental device

[0033] In the figure: 101-micro injection pump A1, 102-micro injection pump A2, 103-micro injection pump A3, 201-micro intermediate container B1, 202-micro intermediate container B2, 203-micro intermediate container B3, 301-first valve, 302-second valve, 303-third valve, 304-fourth valve, 305-fifth valve, 306-sixth valve, 307-seventh valve, 308-eighth valve, 309-ninth valve, 310-tenth valve, 311-vent valve, 4-connecting pipeline, 5-safety bottle, 6-vacuum pump, 7-high-precision pressure sensor C1, 8-high-precision pressure sensor C2, 9-high-temperature and high-pressure visual reactor, 901-reactor shell, 9 02- Reactor cover, 903- Water circulation interface, 904- Injection end interface, 905- Discharge end interface, 906- Gasket, 907- Micromodel, 908- Micromodel position holder, 909- Pressing piece, 910- Fastening resin bolt, 911- Bolt, 912- Bolt, 913- Confining pressure injection port, 914- Temperature probe interface, 915- First high-pressure glass, 916- Second high-pressure glass, 10- Rotating axis, 11- Support frame, 12- Hand crank handle, 13- Base, 14- Microscope, 15- Computer, 16- Temperature probe, 17- Water circulation heating device, 18- Water circulation pipeline, 19- Back pressure valve, 20- Waste liquid collector A, 21- Waste liquid collector B, 22- Insulation sleeve. DETAILED DESCRIPTION

[0034] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0035] See also Figures 1 to 3 The present invention provides a technical solution: a capsule polymer controllable injection and in-situ viscosity enhancement and oil displacement experimental device and method.

[0036] In order to make researchers in the technical field of this application more clearly understand this application, first of all, Figure 1 and Figure 2 The overall connection of the present invention is described in detail through specific embodiments.

[0037] In order to more accurately study the oil displacement performance of capsule polymers after triggering viscosity increase inside porous media, the present invention provides a capsule polymer controllable injection and in-situ viscosity increase oil displacement experimental device, comprising:

[0038] Vacuum deoxygenation system, fluid injection and pipeline transport system, micromodel constant temperature aging system, pressure monitoring and image acquisition system. The vacuum deoxygenation system is used to remove air from the pipeline and dissolved oxygen in the solution, including a vacuum pump 6, a vacuum tube 23, a safety bottle 5, a connecting pipeline 4 and a vent valve 311. The vacuum pump 6 is connected to the safety bottle 5 through the vacuum tube 23. It should be further pointed out that the ultimate pressure of the vacuum pump is ≤6×10 -2 Pa, the existence of the safety bottle can prevent the liquid in the pipeline from entering the vacuum pump and avoid damaging the vacuum pump.

[0039] The fluid injection and pipeline transport system includes a micro injection pump A1, a micro injection pump A3, a micro intermediate container B1, a micro intermediate container B2, a micro intermediate container B3, a connecting pipeline 4, a back pressure valve 19, a waste liquid collection bottle 20, a waste liquid collection bottle 21, a first valve 301, a second valve 302, a third valve 303, a fourth valve 304, a fifth valve 305, a sixth valve 306, a seventh valve 307, an eighth valve 308, a ninth valve 309, and a tenth valve 310, wherein The intermediate container B1 and the intermediate container B2 are controlled by the micro injection pump A1, and the intermediate container B3 and the back pressure valve 19 are controlled by the micro injection pump A3. It should be further pointed out that the micro injection pumps A1, A2 and A3 are all constant pressure and constant flow rate injection pumps, and their constant pressure adjustable range is 0-70MPa, the accuracy is 0.25%, and the flow rate range is 0.001-50ml / min; the volume range of the micro intermediate containers B1, B2, and B3 is 80ml, and the maximum pressure range is 50MPa.

[0040] The micromodel constant temperature aging system includes a high-temperature and high-pressure visualization reactor 9, a temperature probe 16, a water circulation heating device 17, a water circulation pipeline 18, a micro-injection pump A2, a base 13, a support frame 11, a rotating shaft 10, a hand crank handle 12, and a thermal insulation sleeve 22. The micro-injection pump A2 is connected to the high-temperature and high-pressure visualization reactor 9 to provide confining pressure for the micromodel. It should be further pointed out that the rotating shaft 10, the support frame 11 and the base 13 together constitute the high-temperature and high-pressure visualization reactor support structure. The high-temperature and high-pressure visualization reactor 9 is connected by the rotating shaft 10 and fixed on the support frame 11. The high-temperature and high-pressure visualization reactor 9 can be rotated to different angles by shaking the hand crank handle 12.

[0041] The pressure monitoring and image acquisition system includes a high-precision pressure sensor C1, a high-precision pressure sensor C2, a microscope 14, and a computer 15. The high-precision pressure sensor C1 is located between the fourth valve 304 and the fifth valve 305, and the high-precision pressure sensor C2 is located between the seventh valve 307 and the back-pressure valve 19. It should be noted that the high-precision pressure sensors have a measurement range of -100 kPa to 20 MPa and an accuracy of 0.1%. The high-precision pressure sensors transmit pressure values ​​to the computer in real time for acquisition. The microscope can magnify images by 2.5 to 90 times, allowing real-time capture of images of the micromodel's interior and transmission to the computer.

[0042] In one embodiment, the high-temperature and high-pressure visualization reactor 9 includes a reactor shell 901, a reactor cover 902, a water circulation interface 903, an injection end interface 904, a discharge end interface 905, a gasket 906, a micromodel 907, a micromodel position holder 908, a pressing piece 909, a fastening resin bolt 910, a bolt 911, a bolt 912, a confining pressure injection port 913, a temperature probe interface 914, a first high-pressure glass 915, and a second high-pressure glass 916. The micromodel 907 is fixed by the micromodel position holder 908, and a gasket 906 is placed below to contact the reactor shell 901. The micromodel is clamped and pressed by the pressing piece 909, the fastening resin bolt 910, and the bolt 911.

[0043] In one embodiment, there are two injection end interfaces, which are commonly connected to the inlet end of the micromodel; there are two discharge end interfaces, which are commonly connected to the outlet end of the micromodel.

[0044] In one embodiment, the high-temperature and high-pressure visualization reactor 9 has a confined pressure chamber and a water circulation chamber inside, wherein the confined pressure chamber is connected to the micro-injection pump A2 through a pipeline to provide confining pressure conditions for the micromodel, and the water circulation chamber is connected to the water circulation heating device 17 through a water circulation pipeline 18 to provide a temperature environment for the micromodel. It should be further pointed out that the confined pressure chamber and the water circulation chamber are not connected to each other.

[0045] In one embodiment, the water circulation heating device has an adjustable temperature range of 0-95°C with an accuracy of ±0.5°C.

[0046] In one embodiment, the high-temperature and high-pressure visualization reactor has a pressure resistance of 50 MPa and an etching diameter range of 80 mm.

[0047] In one embodiment, the micromodel is made of square heat-resistant and pressure-resistant glass with a thickness of 0.8 cm. The interior has an independently designed pore network structure, and the internal etching model size is 40 mm × 40 mm.

[0048] In one embodiment, the connecting pipeline is made of 316L material, and the pipeline valve is made of 316L material.

[0049] According to a first aspect of the disclosed embodiments of the present invention, an experimental method applicable to the above-mentioned capsule polymer controllable injection and in-situ viscosity enhancement and oil displacement experimental device is provided, characterized in that the method comprises:

[0050] Step 1: By adjusting the closure of the valves in the fluid injection and pipeline transport system and cooperating with the high-temperature and high-pressure visual reactor rotation device, the residual fluid in the pipeline can be discharged to achieve controllable injection of the displacement agent;

[0051] Step 2: By adjusting the injection pressure of the micro-injection pump A2 and setting the temperature of the water circulation heating device (17), the temperature and pressure environment under reservoir conditions can be simulated, and a high-temperature and high-pressure visual reactor is used to realize a visualization study of the viscosity enhancement and oil displacement triggered by the capsule polymer inside the porous medium.

[0052] In order to make the purpose and operation process of the present invention clearer, Figures 1 to 4 The present invention is described in detail.

[0053] When the present invention works, first follow Figure 2 The installation method is to place the micro model 907 in the high temperature and high pressure visualization reactor 9, fix its position with the micro model position holder 908, ensure that the inlet and outlet of the micro model 907 are aligned with the inlet and outlet channels of the reactor shell 901 below, and use resin bolts to press them so that the micro model reaches a clamped and compressed state, then cover the reactor cover 902 and tighten it with bolts 912. Figure 1The experimental setup was connected using the described connection method. Micro-intermediate container B1 contained simulated formation water, micro-intermediate container B2 contained a capsule polymer solution, and micro-intermediate container B3 contained simulated oil. At the start of the experiment, micro-injection pump A2 was set to constant pressure mode to maintain the pressure inside the confining pressure chamber of the high-temperature, high-pressure visualization reactor 9 at 15 MPa. The temperature of the water circulation heater was adjusted to maintain a stable temperature of 70°C inside the confining pressure chamber, providing the necessary temperature for the capsule polymer to trigger viscosity increase. The high-temperature, high-pressure visualization reactor was then inspected for leaks to ensure overall sealing. All valves were closed. The second, fourth, fifth, and eighth valves 302, 304, and 305, as well as the vent valve 311, were opened. Vacuum pump 6 was then activated to deoxygenate the pipelines for 3-5 minutes. Subsequently, valve 305 was closed and vacuum pumping continued for 1-1.5 hours to fully remove dissolved oxygen from the solutions in micro-intermediate containers B1 and B2. All valves and vacuum pump 6 were then closed. Open the first valve 301, the second valve 302, and the fifth valve 305, set the flow rate of the micro-injection pump A1 to 15-30 μL / min, saturate the micro-model with water, then open the seventh valve 307 to drain the excess water, and close all valves and the micro-injection pump A1. Open the ninth valve 309 and the eighth valve 308, set the injection flow rate of the micro-injection pump A3 to 10 μL / min to saturate the micro-model with simulated oil, and the excess simulated oil flows out of the sixth valve 306 to the waste liquid collector B, and close the micro-injection pump A3 and all valves. Rotate the hand crank 12 to slowly rotate the high-temperature and high-pressure visual reactor to invert, and follow Figure 3 and Figure 4The injection method shown was used to remove residual simulated oil from the pipeline. Microinjection pump A1 was set to an injection rate of 10 μL / min. The third, fourth, fifth, and sixth valves 303, 304, 305, and 306 valves were opened to fully drain the remaining simulated oil from the pipeline. The sixth valve 306 was then closed and the high-temperature, high-pressure visualization reactor was rotated to the upright position. Microinjection pump A3 was set to constant pressure mode at 10 MPa. The tenth valve 310 was opened to apply back pressure to the pipeline. The seventh valve 307 was opened, and the flow rate of microinjection pump A1 was set to 2 μL / min. A 0.5 PV capsule polymer solution was injected into the micromodel. The effluent flowed through valve 307 into wastewater collector A. High-precision pressure sensors C1 and C2 were used to monitor the pressure differential within the micromodel, and real-time images of the oil-water distribution within the micromodel were captured using a microscope. All valves and microinjection pump A1 were closed, and the capsule polymer within the porous medium was thermally aged for a set number of days. After a period of thermal aging, the high-temperature, high-pressure visualization reactor 9 is inverted, and the first, second, fifth, and sixth valves 301, 302, 305, and 306 valves are opened to fully drain any residual capsule polymer solution from the pipeline. The sixth valve 306 is closed, and the high-temperature, high-pressure visualization reactor 9 is placed upright with the seventh valve 307 opened. Simulated formation water is injected into the micromodel, and the pressure differential within the micromodel is monitored using high-precision pressure sensors C1 and C2 to reflect the degree of capsule polymer viscosity increase. The flow path of the simulated formation water within the micromodel and the oil-water distribution at different displacement rates are observed using a microscope 14. Furthermore, by varying the thermal aging time and temperature of the capsule polymer, the oil displacement performance of the capsule polymer at different triggering levels can be studied.

[0054] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Capsule polymer controllable injection and in-situ viscosity enhancement and oil displacement experimental device, characterized in that: include: Vacuum deoxidation system, fluid injection and pipeline transport system, micro-model constant temperature aging system, pressure monitoring and image acquisition system; The vacuum deoxygenation system comprises a vacuum pump (6), a vacuum tube (23), a safety bottle (5), a connecting pipeline (4) and a venting valve (311), wherein the vacuum pump (6) is connected to the safety bottle (5) via the vacuum tube (23); The fluid injection and pipeline transport system includes a micro injection pump A1 (101), a micro injection pump A3 (103), a micro intermediate container B1 (201), a micro intermediate container B2 (202), a micro intermediate container B3 (203), a connecting pipeline (4), a back pressure valve (19), a waste liquid collector A (20), a waste liquid collector B (21), a first valve (301), a second valve (302), a third valve (303), a fourth valve (304), a fifth valve (305), a sixth valve (306), a seventh valve (307), an eighth valve (308), a ninth valve (309), and a tenth valve (310), wherein the micro intermediate container B1 (201) and the micro intermediate container B2 (202) are controlled by the micro injection pump A1 (101), and the micro intermediate container B3 (203) and the back pressure valve (19) are controlled by the micro injection pump A3 (103); The micro-model constant temperature aging system comprises a high-temperature and high-pressure visual reactor (9), a temperature probe (16), a water circulation heating device (17), a water circulation pipeline (18), a micro-injection pump A2 (102), a base (13), a support frame (11), a rotating shaft (10), a hand crank handle (12), and a heat preservation sleeve (22), wherein the high-temperature and high-pressure visual reactor (9) is connected to the rotating shaft (10) and fixed on the support frame (11), and the high-temperature and high-pressure visual reactor (9) is rotated by shaking the hand crank handle (12); The high-temperature and high-pressure visualization reactor (9) comprises a reactor shell (901), a reactor upper cover (902), a water circulation interface (903), an injection end interface (904), a discharge end interface (905), a gasket (906), a micromodel (907), a micromodel position fixer (908), a pressing piece (909), a fastening resin bolt (910), a small bolt (911), a large bolt (912), a confining pressure injection port (913), a temperature probe interface (914), a first high-pressure glass (915), and a second high-pressure glass (916), wherein the micromodel (907) is fixed by the micromodel position fixer (908), and the gasket (906) is placed below to connect with the reactor shell. (901) contacts, and clamps and presses the micromodel through a pressing sheet (909), a fastening resin bolt (910), and a bolt (911), there are two injection end interfaces (904), and the two interfaces are connected to the inlet end of the micromodel (907), there are two discharge end interfaces (905), and the two interfaces are connected to the outlet end of the micromodel (907), and the high-temperature and high-pressure visualization reactor (9) has a confining pressure chamber and a water circulation chamber inside, wherein the confining pressure chamber is connected to the micro injection pump A2 (102) to provide confining pressure conditions for the micromodel, and the water circulation chamber is connected to the water circulation heating device (17) through a water circulation pipeline (18) to provide a temperature environment for the micromodel; The pressure monitoring and image acquisition system comprises a high-precision pressure sensor C1 (7), a high-precision pressure sensor C2 (8), a microscope (14), and a computer (15), wherein the high-precision pressure sensor C1 (7) is located between the fourth valve (304) and the fifth valve (305), and the high-precision pressure sensor C2 (8) is located between the seventh valve (307) and the back pressure valve (19).

2. The capsule polymer controlled injection and in-situ viscosity-enhancing oil displacement experimental device according to claim 1, characterized in that: The micro injection pump A1 (101), micro injection pump A2 (102), and micro injection pump A3 (103) are constant pressure and constant flow rate injection pumps, with a constant pressure adjustable range of 0-70 MPa, an accuracy of 0.25%, and a flow rate range of 0.001-50 ml / min.

3. The capsule polymer controlled injection and in-situ viscosity-enhancing oil displacement experimental device according to claim 1, characterized in that: The temperature of the water circulation heating device can be adjusted within a range of -20-100°C with an accuracy of ±0.5°C.

4. The capsule polymer controlled injection and in-situ viscosity-enhancing oil displacement experimental device according to claim 1, characterized in that: The micromodel is made of heat-resistant and pressure-resistant glass, and has an independently designed pore network structure inside.

5. A method applicable to the capsule polymer controlled injection and in-situ viscosity enhancement and oil displacement experimental device according to claim 1, characterized in that: The method includes: Step 1: By adjusting the closure of the valves in the fluid injection and pipeline transport system and cooperating with the high-temperature and high-pressure visual reactor rotation device, the residual fluid in the pipeline can be discharged to achieve controllable injection of the displacement agent; Step 2: By adjusting the injection pressure of the micro-injection pump A2 and setting the temperature of the water circulation heating device (17), the temperature and pressure environment under reservoir conditions can be simulated, and a high-temperature and high-pressure visual reactor is used to realize a visualization study of the viscosity enhancement and oil displacement triggered by the capsule polymer inside the porous medium.

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