Three-dimensional microfluidic multiphase flow chip experimental platform and experimental method based on vibration conditions

Abstract

The invention belongs to the field of porous medium multiphase flow research, and particularly relates to a three-dimensional micro-fluidic multiphase flow chip experimental platform based on a vibration condition and an experimental method of the three-dimensional micro-fluidic multiphase flow chip experimental platform based on the vibration condition. The device can simulate the micromechanism of oil-water-gas three-phase flow, and the micro-fluidic chip is arranged on the three-dimensional vibration table, so that the dynamic change of a multi-phase fluid interface is observed in real time through the high-speed camera under different vibration frequencies and amplitude conditions, and the influence of the dynamic change on the flow characteristics is analyzed. Through experiments, the influence of vibration conditions on residual oil mobilization can be discussed, and a microscopic basis is provided for optimizing a vibration-assisted oil extraction technology. A novel research tool and an experiment platform are provided for improving the recovery efficiency and developing complex reservoirs, and the development of the vibration oil extraction technology is promoted.

Description

Technical Field

[0001] The present invention belongs to the field of research on multiphase flow in porous media, and specifically relates to a three-dimensional microfluidic multiphase flow chip experimental platform and experimental method based on vibration conditions. Background Art

[0002] In the research process of oil-gas-water multiphase seepage in complex porous media, the displacement of real cores or two-dimensional visualization microfluidic technology is often used. Due to the complexity of pore structures, although real cores have a three-dimensional porous medium structure, due to their non-replicability, they cannot meet the research needs of multiple parallel experiments. And the current two-dimensional visualization microfluidic technology often uses two-dimensional planar chips for research. For example, Chinese patent document CN117662112A (202311446500.3) discloses a simulation device and simulation method for liquid sulfur-gas-water multiphase flow and its application in high-temperature, high-pressure, and high-sulfur gas reservoirs. Although it meets the research needs of multiple parallel experiments, it is difficult to effectively reflect the research needs of gas-water multiphase seepage in three-dimensional flow paths.

[0003] Chinese patent document CN117920364A (202211318808.5) discloses a three-dimensional microfluidic chip, its preparation method, and a three-dimensional microfluidic system. However, the above chip lacks variable diameter and tortuous structures to reflect the pore throat structure of real cores, and has certain limitations and structural deficiencies. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above models, and provide a three-dimensional microfluidic multiphase flow chip experimental platform and experimental method based on vibration conditions, which can simulate the microscopic mechanism of multiphase flow in rocks with different porosities and permeabilities, and study the influence of vibration conditions on the flow characteristics of multiphase flow and the mobilization of residual oil.

[0005] The technical problems to be solved by the present invention are achieved by the following technical solutions: A three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions, including a microfluidic chip, a pressure sensor, a three-dimensional vibration table, a vibration controller, a high-speed camera, a waste liquid pool, and a fluid supply system;

[0006] The microfluidic chip includes a chip body and a tortuous variable-diameter flow channel arranged in the chip body. The chip body is provided with a plurality of fluid inlets and fluid outlets connected to the tortuous variable-diameter flow channel, and the chip body is made of a transparent material;

[0007] The tortuous variable-diameter flow channel includes a plurality of spatially tortuous tubes and a plurality of pore throat simulation channels that are interconnected;

[0008] The chip body is provided with a plurality of pressure test channels communicating with the tortuous variable-diameter flow channels, and the pressure sensors are connected to the pressure test channels;

[0009] The fluid supply system is connected to the fluid inlet and is used to input the fluid to be tested into the tortuous variable-diameter flow channels;

[0010] The waste liquid pool is connected to the fluid outlet;

[0011] The microfluidic chip is arranged on a three-dimensional vibration table, and the vibration controller is used to control the vibration frequency and amplitude of the three-dimensional vibration table;

[0012] The high-speed camera is used to collect the morphology of the fluid inside the tortuous variable-diameter flow channels.

[0013] Preferably, in the present invention, the spatial tortuous tubes and the pore throat simulation channels are alternately arranged;

[0014] The spatial tortuous tubes at least include a ZY-plane tortuous structure, an XY-plane tortuous structure, and an XZ-plane tortuous structure. The spatial tortuous tubes and the pore throat simulation channels are alternately arranged, and the pore throat simulation channels are used to connect the spatial tortuous tubes arranged in different planes. Considering the three-dimensional structure simulation, the three coordinate axes of the Cartesian three-dimensional coordinate system are arranged.

[0015] Preferably, in the present invention, the pore size range of the tortuous variable-diameter flow channels is distributed within a variable-diameter range of 1 to 300 microns. Based on the pore size of the low-permeability reservoir, the pore size range of the tortuous variable-diameter flow channels is distributed within a variable-diameter range of 1 to 300 microns, so as to meet the experimental simulation of real low-permeability rocks.

[0016] Preferably, in the present invention, the tortuosity of the spatial tortuous tubes is between 1 and 10, and the pore throat ratio of the pore throat simulation channels is between 1:1 and 1:300. According to the simulation requirements, each variable-diameter pore channel and the tortuous capillary structure can be freely constructed within the above ratios and at different three-dimensional plane positions.

[0017] Preferably, in the present invention, the microfluidic chip further includes a liquid storage tank arranged in the chip body;

[0018] The liquid storage tank is respectively connected to the fluid inlet and the inlet of the tortuous variable-diameter flow channels. The liquid storage tank is used to ensure the continuity of the fluid in the tortuous variable-diameter flow channels and the stability of the fluid during the test.

[0019] Preferably, in the present invention, the chip body is provided with three fluid inlets, and the fluid supply system includes a pressure pump connected to the fluid inlets. The fluid inlets can be connected to different fluid accesses through pipelines to simulate multiphase flow in complex reservoirs; by designing a three-dimensional microfluidic chip with three-phase fluid injection ports and pressure measurement holes, the microscopic mechanism of oil-water-gas three-phase flow is simulated.

[0020] Preferably, the present invention further includes a control system, and the pressure sensor, the vibration controller, and the pressure pump are all electrically connected to the control system;

[0021] The control system is used to collect the signals of the pressure sensor and to set the working parameters of the vibration controller and the pressure pump.

[0022] The present invention also discloses an experimental method for three-dimensional microfluidic multiphase flow chips based on vibration conditions. Using the above experimental platform, it includes the following steps:

[0023] S1. Set up the experimental platform, and use the fluid supply system to input the fluid to be measured into the tortuous variable-diameter flow channel;

[0024] S2. Use the vibration controller to set the required vibration frequency and amplitude, start the three-dimensional vibration table, and apply the set vibration conditions;

[0025] S3. Use the pressure sensor to monitor the pressure change inside the chip in real time;

[0026] Use a high-speed camera to obtain the dynamic images inside the chip in real time and observe the behavior of the multiphase fluid;

[0027] S4. Analyze the data recorded by the pressure sensor and evaluate the fluid flow characteristics;

[0028] Analyze the images obtained by the high-speed camera and study the interfacial behavior and dynamic characteristics of the multiphase fluid.

[0029] Preferably, in step S1 of the present invention, the fluid supply system is used to input fluids of different phases into the tortuous variable-diameter flow channel through different fluid inlets in sequence to form a slug flow, and then it is used to study the interfacial behavior and dynamic characteristics of the multiphase fluid.

[0030] Preferably, in step S1 of the present invention, before introducing the gas-phase fluid, the tortuous variable-diameter flow channel is first filled with the liquid-phase fluid.

[0031] The inventive concept of the present invention: The pore size ratio directly affects the permeability of the rock. A higher pore size ratio usually means better connectivity between pores, smoother fluid flow, and thus higher permeability. On the contrary, a lower pore size ratio may lead to poor connectivity between pores, blocked fluid flow, and reduced permeability.

[0032] Tortuosity is a parameter describing the degree of tortuosity of the fluid flow path in a porous medium. A higher tortuosity means a more tortuous fluid flow path, increased flow resistance, and reduced permeability. On the contrary, a lower tortuosity indicates a relatively straight fluid flow path, smaller flow resistance, and higher permeability.

[0033] Therefore, the present invention simulates the rock properties with different porosities and permeabilities by designing capillary tubes with different tortuosities and pore throat simulation channels with different diameter ratios. And a pressure test channel is arranged on the microfluidic chip, and multi-point pressure measurement of the internal structure of the chip is carried out through a pressure sensor to meet the research needs of the pressure change characteristics of multiphase fluids in a three-dimensional flow path.

[0034] In order to simulate the underground effect of vibration enhanced oil recovery in the experimental platform of the present invention, based on the vibration generator propagating in the formation, affecting the physical properties of the reservoir and increasing the production to improve the oil recovery method. By setting the microfluidic chip on a three-dimensional vibration table and adjusting the working parameters of the three-dimensional vibration table, vibrations with different frequencies and amplitudes can be generated in the chip to simulate the vibration conditions in the actual oil production process.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. Simulating multiphase flow in complex reservoirs: The experimental platform of the present invention simulates the microscopic mechanism of oil-water-gas three-phase flow by designing a three-dimensional microfluidic chip with multiple fluid inlets and pressure test channels.

[0037] 2. Observing the interface behavior of multiphase fluids: The microfluidic chip is set on a three-dimensional vibration table. Under different vibration frequencies and amplitudes, the dynamic changes of the multiphase fluid interface can be observed in real time through a high-speed camera, and the influence on the flow characteristics can be analyzed.

[0038] 3. Studying the law of residual oil mobilization: Through experiments, the influence of vibration conditions on residual oil mobilization is explored, providing a microscopic basis for optimizing vibration-assisted oil recovery technology.

[0039] 4. Providing microscopic research tools and experimental platforms: Providing new research tools and experimental platforms for improving oil recovery and developing complex reservoirs, and promoting the development of vibration enhanced oil recovery technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of the experimental platform of the three-dimensional microfluidic multiphase flow chip based on vibration conditions of the present invention;

[0041] Figure 2 It is a schematic structural diagram of the microfluidic chip of the present invention;

[0042] Figure 3 It is a schematic structural diagram of the tortuous variable-diameter flow channel in the present invention;

[0043] In the figure, 1 is a microfluidic chip, 2 is a pressure sensor, 3 is a three-dimensional vibration table, 4 is a vibration controller, 5 is a high-speed camera, and 6 is a waste liquid pool;

[0044] 11 Chip body, 12 tortuous variable-diameter flow channel, 111 fluid inlet, 112 fluid outlet, 113 pressure test channel, 114 liquid storage tank;

[0045] 7 Pressure pump, 8 Control system;

[0046] 121 Spatial tortuous pipe, 122 Pore-throat simulation channel. Specific implementation mode

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings.

[0048] As Figures 1 - 3 shown, a three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions includes a microfluidic chip 1, a pressure sensor 2, a three-dimensional vibration table 3, a vibration controller 4, a high-speed camera 5, a waste liquid pool 6, and a fluid supply system.

[0049] As Figure 2 and Figure 3 shown, the microfluidic chip 1 includes a chip body 11 and a tortuous variable-diameter flow channel 12 provided in the chip body 11. The chip body 11 is provided with a plurality of fluid inlets 111 and fluid outlets 112 connected to the tortuous variable-diameter flow channel 12, and the chip body 11 is made of a transparent material. Specifically, the chip body 11 is formed in the shape of a square frustum made of a special engineering plastic material. To meet the exploration of its internal structure, measures such as nuclear magnetic resonance and CT scanning are taken for its internal structure, and the size range is between 5x5x10 cm.

[0050] As Figure 2 and Figure 3 shown, both the fluid inlet 111 and the fluid outlet 112 are provided with threaded structures, so as to facilitate threaded connection with external pipes, ensuring sealing while improving work efficiency.

[0051] The chip body 11 is provided with a plurality of pressure test channels 113 communicating with the tortuous variable-diameter flow channel 12, and the pressure sensor 2 is connected to the pressure test channels 113. The pressure measurement pipes 113 communicate with the outside and are arranged at intervals. As Figure 3 shown, the pressure measurement pipes 113 are arranged at the joints of the spatial tortuous pipe 121 and the pore-throat simulation channel 122, that is, one pressure measurement pipe 113 is arranged at each of the inlet and outlet ends of the pore-throat simulation channel 122 to meet the research needs of the pressure change characteristics of multiphase fluids in a three-dimensional flow path.

[0052] The fluid supply system is connected to the fluid inlet 111 and is used to input the fluid to be tested into the tortuous variable-diameter flow channel 12.

[0053] The waste liquid pool 6 is connected to the fluid outlet 112.

[0054] The microfluidic chip 1 is arranged on the three-dimensional vibration table 3, and the vibration controller 4 is used to control the vibration frequency and amplitude of the three-dimensional vibration table 3.

[0055] The high-speed camera 5 is used to collect the morphology of the fluid inside the tortuous and variable-diameter flow channel 12.

[0056] As Figure 3 shown, the tortuous and variable-diameter flow channel 12 includes a plurality of spatially tortuous tubes 121 and a plurality of pore throat simulation channels 122 that are interconnected. The spatially tortuous tubes 121 and the pore throat simulation channels 122 are arranged alternately with each other, and the spatially tortuous tubes 121 and the pore throat simulation channels 122 are connected end to end to form a tortuous and variable-diameter flow channel 12. The spatially tortuous tube 121 is a capillary tube with a constant inner diameter, and the pore throat simulation channel 122 is a variable-diameter capillary tube. The three-dimensional flow path composed of a plurality of curved spatially tortuous tubes 121 and a plurality of variable-diameter pore throat simulation channels 122 can generate velocity vectors in the x, y, and z directions during the flow of the liquid.

[0057] In this embodiment, the pore throat simulation channel has a variable-diameter structure with conical tubes at both ends and a cylindrical tube in the middle. The variable-diameter form is that the radius of the cylindrical pipeline increases or decreases with the pipeline length, forming a multi-stage variable-diameter capillary structure.

[0058] The spatially tortuous tube 121 at least includes a ZY-plane tortuous structure, an XY-plane tortuous structure, and an XZ-plane tortuous structure. Specifically, a spatially tortuous tube 121 is arranged on the ZY plane, the XY plane, and the XZ plane respectively. In this embodiment, as Figure 3 shown, for the convenience of setting the tortuosity, the spatially tortuous tube 121 is bent only once.

[0059] The pore size range of the tortuous and variable-diameter flow channel 12 is distributed within a variable-diameter range of 1 to 300 microns to meet the experimental simulation of real low-permeability rocks.

[0060] The tortuosity of the spatially tortuous tube 121 is between 1 and 10, and the pore throat ratio of the pore throat simulation channel 122 is between 1:1 and 1:300. The tortuosity of the spatially tortuous tube 21 and the variable-diameter degree of the pore throat simulation channel 122 can be adjusted to simulate different real core conditions.

[0061] The internal structure of the above chip includes the variable-diameter form and the spatial tortuous state of multiple internal pipelines. The variable-diameter form is that the radius of the cylindrical pipeline increases or decreases with the pipeline length, forming a multi-stage variable-diameter capillary structure. The arrangement of each multi-stage variable-diameter capillary pipeline in space forms a spatial tortuous state.

[0062] The spatial tortuosity state of the spatial tortuosity tube includes the spatial form of the variable diameter capillary tube that is tortuous in the chip. Since the spatial tortuosity tube 121 and the pore throat simulation channel 122 are arranged alternately with each other, the spatial tortuosity tube forms an angle with the pipe axis of the cylindrical pipeline of the pore throat simulation channel, and the total length of the tortuous variable diameter flow channel corresponding to the pipeline is greater than the straight-line distance between the fluid inlet and the fluid outlet.

[0063] The microfluidic chip 1 further includes a liquid storage tank 114 disposed in the chip body 11 .

[0064] The liquid storage tank 114 is respectively connected to the fluid inlet 111 and the inlet of the tortuous variable diameter flow channel 12. In this embodiment, the volume of the liquid storage tank 114 is equal to the volume of the tortuous variable diameter flow channel 12.

[0065] In this embodiment, the chip body 11 is provided with three fluid inlets 111 , and the fluid supply system includes a pressure pump 7 connected to the fluid inlets 111 .

[0066] The three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions further includes a control system 8 , and the pressure sensor 2 , the vibration controller 4 and the pressure pump 7 are all electrically connected to the control system 8 .

[0067] The control system 8 is used to collect signals from the pressure sensor 2 and to set working parameters of the vibration controller 4 and the pressure pump 7 .

[0068] In the present invention, the tortuous variable diameter flow channel in the chip body is engraved by ultrafast laser pulses. The principle of laser internal engraving is a nonlinear optical phenomenon. Although transparent materials are generally transparent to lasers and do not absorb laser energy, they will produce nonlinear effects under sufficiently high light intensities, such as multi-photon ionization and above-threshold ionization. Therefore, at the focus point of a laser with sufficiently high intensity, the transparent material will absorb the laser energy in a short time and produce micro-bursts, and a large number of micro-burst points are arranged into the required pattern. Using the above principle, the preparation of the tortuous variable diameter flow channel inside the chip body is realized.

[0069] The chip body is prepared by different materials according to the wettability requirements of the tortuous variable diameter flow channel. In this embodiment, the chip body 11 can be prepared by quartz or Peek. Using different materials to manufacture chips can achieve the simulation of tortuous variable diameter flow channels with different wettabilities. In addition, the cores of different oil reservoirs have different wettabilities, and materials with different wettabilities are used to simulate the real cores of different oil reservoirs.

[0070] The microfluidic core stack uses laser engraving technology to complete microchannel processing. By combining ultrafast laser pulses to generate high heat, materials such as PMMA, COC, PET, PDMS and glass are melted in situ to obtain a microfluidic chip with three-dimensional tortuous tubes.

[0071] Laser engraving technology has important applications in the processing of microfluidic chips, mainly used for precise processing of microchannels and microstructures. Compared with traditional lithography and etching methods, laser engraving technology has advantages such as high precision, fast processing, and flexibility. Laser engraving can directly process microchannels on the substrate, avoiding the complexity of multiple steps required in traditional methods. For example, using femtosecond laser technology, microfabrication can be carried out on a glass substrate to manufacture microfluidic structures.

[0072] An experimental method for three-dimensional microfluidic multiphase flow chips based on vibration conditions, using the experimental platform of this embodiment, includes the following steps:

[0073] S1. Set up the experimental platform, and use the fluid supply system to input the fluid to be measured into the tortuous variable-diameter flow channel 12.

[0074] S2. Use the vibration controller 4 to set the required vibration frequency and amplitude, start the three-dimensional vibration table 3, and apply the set vibration conditions.

[0075] S3. Use the pressure sensor 2 to monitor the pressure change inside the chip in real time.

[0076] Use the high-speed camera 5 to obtain the dynamic images inside the chip in real time and observe the behavior of the multiphase fluid.

[0077] S4. Analyze the data recorded by the pressure sensor 2 and evaluate the fluid flow characteristics.

[0078] Analyze the images obtained by the high-speed camera 5 to study the interface behavior and dynamic characteristics of the multiphase fluid.

[0079] In step S1, use the fluid supply system to input fluids of different phases into the tortuous variable-diameter flow channel 12 through different fluid inlets 111 in sequence. To facilitate the observation of the interface behavior and dynamic characteristics of the multiphase fluid, the liquid phases such as the oil phase and the water phase can be set to different colors.

[0080] In step S1, before introducing the gas-phase fluid, first fill the tortuous variable-diameter flow channel 12 with the liquid-phase fluid to ensure that a gas-liquid interface can be formed. Usually, before the experiment, first fill the tortuous variable-diameter flow channel 12 with water for wetting.

[0081] Specific examples of experimental operation steps:

[0082] In this embodiment, the microfluidic chip is applied to display the pressure reduction effect of vibration extraction, specifically including the following steps:

[0083] Start injecting the blue aqueous liquid into the microfluidic chip 1 at a pressure of 100 mbar for easy observation to simulate the saturated formation water environment.

[0084] The red oil-phase liquid is intermittently injected into the microfluidic chip 1 at a pressure of 125 mbar to form a flowing oil-phase segment in the chip channel.

[0085] The gas-phase fluid is intermittently injected into the microfluidic chip 1 at a pressure of 150 mbar to form a flowing gas-phase slug in the chip channel.

[0086] The morphological changes of various liquid slugs flowing in the channel of the microfluidic chip 1 are observed through a microscope, and the images are analyzed using ImageJ software to study the contact angle and saturation distribution of the liquid slugs in the variable-diameter tortuous channel.

[0087] Vibration is loaded at a horizontal vibration parameter of 5 Hz and an amplitude of 0.04 mm. The deformation of the contact angle of the liquid slug due to vibration is observed, and the pressure change when the liquid slug flows through the variable-diameter tortuous structure is recorded simultaneously.

[0088] The vibration frequency is gradually increased in multiples of 5 Hz, and the pressure fluctuations at both ends of the variable-diameter tortuous structure are observed and recorded.

[0089] Vibration is loaded until 100 Hz, the vibration loading is stopped, and the data is analyzed. The flow pressure differences are compared, and the group with the most obvious pressure reduction effect is selected. The pressure reduction process is quantitatively analyzed in combination with the images.

Claims

1. A three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions, characterized by: It comprises a microfluidic chip (1), a pressure sensor (2), a three-dimensional vibration table (3), a vibration controller (4), a high-speed camera (5), a waste liquid pool (6) and a fluid supply system; The microfluidic chip (1) comprises a chip body (11) and a tortuous variable-diameter flow channel (12) arranged in the chip body (11); the chip body (11) is provided with a plurality of fluid inlets (111) and fluid outlets (112) connected to the tortuous variable-diameter flow channel (12); and the chip body (11) is made of a transparent material; The tortuous variable-diameter flow channel (12) comprises a plurality of space tortuous tubes (121) and a plurality of pore-throat simulation channels (122) that are interconnected; The chip body (11) is provided with a plurality of pressure test channels (113) communicating with the tortuous variable-diameter flow channel (12), and the pressure sensor (2) is connected to the pressure test channel (113); The fluid supply system is connected to the fluid inlet (111) and is used to input the fluid to be tested into the tortuous variable diameter flow channel (12); The waste liquid pool (6) is connected to the fluid outlet (112); The microfluidic chip (1) is arranged on a three-dimensional vibration table (3), and the vibration controller (4) is used to control the vibration frequency and amplitude of the three-dimensional vibration table (3); The high-speed camera (5) is used to collect the morphology of the fluid inside the tortuous and variable-diameter flow channel (12).

2. The three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions according to claim 1, characterized in that: The spatial tortuous tubes (121) and the pore throat simulation channels (122) are arranged alternately with each other; The spatial tortuous tube (121) comprises at least a ZY plane tortuous structure, an XY plane tortuous structure and an XZ plane tortuous structure.

3. The three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions according to claim 2, characterized in that: The pore range of the tortuous variable diameter flow channel (12) is distributed in the variable diameter range of 1 to 300 microns.

4. The three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions according to claim 2, characterized in that: The tortuosity of the spatial tortuosity tube (121) is between 1 and 10, and the pore-throat ratio of the pore-throat simulation channel (122) is between 1:1 and 1:

300.

5. The three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions according to claim 1, characterized in that: The microfluidic chip (1) further comprises a liquid storage tank (114) arranged in the chip body (11); The liquid storage tank (114) is respectively connected to the fluid inlet (111) and the inlet of the tortuous and variable-diameter flow channel (12).

6. The three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions according to any one of claims 1 to 5, characterized in that: The chip body (11) is provided with three fluid inlets (111), and the fluid supply system comprises a pressure pump (7) connected to the fluid inlets (111).

7. The three-dimensional microfluidic multiphase flow chip experimental platform based on vibration conditions according to claim 6, characterized in that: It also includes a control system (8), wherein the pressure sensor (2), the vibration controller (4) and the pressure pump (7) are all electrically connected to the control system (8); The control system (8) is used to collect signals from the pressure sensor (2) and to set the working parameters of the vibration controller (4) and the pressure pump (7).

8. A three-dimensional microfluidic multiphase flow chip experimental method based on vibration conditions, using the experimental platform described in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, constructing an experimental platform, and using a fluid supply system to input a fluid to be tested into a tortuous variable-diameter flow channel (12); S2. Using a vibration controller (4), setting the required vibration frequency and amplitude, starting the three-dimensional vibration table (3), and applying the set vibration conditions; S3, using the pressure sensor (2) to monitor the pressure changes inside the chip in real time; Use a high-speed camera (5) to obtain real-time dynamic images inside the chip and observe the behavior of the multiphase fluid; S4, analyzing the data recorded by the pressure sensor (2) to evaluate the fluid flow characteristics; The images acquired by the high-speed camera (5) are analyzed to study the interface behavior and dynamic characteristics of the multiphase fluid.

9. The three-dimensional microfluidic multiphase flow chip experimental method based on vibration conditions according to claim 8, characterized in that: In step S1, a fluid supply system is used to sequentially input fluids of different phases into the tortuous variable diameter flow channel (12) through different fluid inlets (111).

10. The three-dimensional microfluidic multiphase flow chip experimental method based on vibration conditions according to claim 9, characterized in that: In step S1, before the gas phase fluid is introduced, the tortuous variable diameter flow channel (12) is first filled with the liquid phase fluid.

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