A visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids

Abstract

This invention discloses a visualized microfluidic experimental device for gas-water-oil-solid-biomass multiphase and multicomponent fluids, comprising a fluid injection device and an experimental platform connected sequentially by pipelines. The fluid injection device includes an experimental pump; a microflow control chip is installed on the experimental platform; the experimental pump and the microflow control chip are connected by pipelines. This device, through the microfluidic chip, can observe in real time the transport patterns of fluids with different gas-water-oil-solid-biomass ratios and different chemical components in pipelines, pores, and fissures during experiments, as well as the particulate matter carrying capacity under different apparent volume ratios of bubbles, different flow velocities, different surfactants, and different fluid composition conditions. Furthermore, using this experimental device, the fluid within the microfluidic chip can be observed with a microscope during experiments, maximally reproducing the original experimental environment, clearly observing the fluid's movement direction and flow interface during the experiment, and dynamically monitoring the experimental dynamics in real time.

Description

Technical Field

[0001] This invention relates to the field of multiphase flow research devices, and more specifically to a visual microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids. Background Technology

[0002] Multiphase flow experiments are an important tool for studying the behavior of multiple fluid phases (such as gas, liquid, and solid) under complex flow conditions. They are typically conducted in laboratories using various simulation experiments. However, current techniques still face some challenges and limitations, primarily including:

[0003] Existing technologies are generally two-phase or three-phase fluid flow test platforms, which cannot achieve stable injection of multiphase mixed fluids and cannot be used for testing with multiphase mixed fluids;

[0004] Poor visualization: During the experiment, the flow direction and state of the fluid in the complex flow channels within the device are usually difficult to observe. Complex interactions between multiphase fluids: The complex interactions between different phase fluids (such as gas-liquid and solid-liquid) make the flow behavior difficult to predict and simulate, requiring direct observation. For example, the generation, merging, and separation of bubbles and droplets have a significant impact on flow performance, but these processes are difficult to fully simulate in experiments, and the composition of the fluid, especially the components of mixed-phase fluids, is difficult to monitor in real time.

[0005] Lack of dynamic monitoring capabilities: In multiphase flow experiments, it is necessary to monitor parameters such as the distribution, velocity, and concentration of each phase in real time to obtain dynamic information about the flow process. However, the application of current real-time monitoring technology still has certain limitations;

[0006] Simulating flow interfaces is challenging: the interfaces between fluids are in an unstable state, especially in high-speed flows or complex geometries, and the accurate simulation and prediction of these flow interfaces is a challenge.

[0007] Differences between experimental conditions and field environment: Multiphase flow tests under laboratory conditions cannot fully simulate the complex conditions in real industrial environments, such as high pressure, high temperature, and non-uniform geological conditions, which will affect the applicability and promotion of the test results.

[0008] Model validation and acquisition of validation data: The complexity of multiphase flow makes it difficult to validate numerical simulations and experimental data, requiring a large amount of experimental data to verify the accuracy and reliability of the model.

[0009] To address these issues, it is necessary to develop more advanced experimental techniques and equipment, such as high-precision sensors, real-time data processing technologies, and accurate numerical simulation methods, to improve the accuracy, repeatability, and applicability of multiphase flow experiments in the field. Summary of the Invention

[0010] In view of this, the present invention provides a visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A visualized microfluidic experimental device for gas-water-oil-solid-gene multiphase and multicomponent fluids includes a fluid injection device and an experimental platform connected sequentially by pipelines.

[0013] The fluid injection device includes a test pump;

[0014] A micro-flow control chip is installed on the test platform;

[0015] The test pump is connected to the micro-flow control chip via the pipeline.

[0016] Preferably, the test pump can be a flow pump, pressure pump, etc.

[0017] Preferably, it further includes a relay container, wherein a stirrer is provided inside the relay container, the fluid injection device is connected to the inlet of the relay container through the pipeline, and the micro-flow control chip is connected to the outlet of the relay container through the pipeline.

[0018] Furthermore, the microflow control chip is provided with multiple fluid injection holes, and the test pump and the relay container are respectively connected to the fluid injection holes.

[0019] Preferably, it also includes a displacement test device, using a related microflow control chip to simulate the internal pathways of the displacement test device (i.e., related to the internal structure of the displacement test body; for example, if the displacement body is a homogeneous rock sample, the fluid channels of the microfluidic chip structure should be uniformly distributed; if it is a fractured rock sample, the internal structure of the microfluidic chip has various irregular pathways in different directions). The microflow control chip is provided with a fluid discharge hole, and the displacement test device is connected to the fluid discharge hole through the pipeline.

[0020] Furthermore, the displacement test apparatus includes a test specimen holder and a displacement test specimen, the displacement test specimen being mounted via the test specimen holder.

[0021] Furthermore, the displacement test device is equipped with a front pressure gauge and a rear pressure gauge at each end to test the breakthrough pressure of the configured gas / liquid / solid mixed fluid in the same formation.

[0022] Furthermore, it also includes a waste liquid collection device, which is connected to the displacement test specimen via a pipeline.

[0023] Preferably, the fluid channels in the microflow control chip include one or more of the following: Y-type, grid type, and multi-layer stacked type, but are not limited thereto. They can simulate different depths of formations and reservoirs / caprocks to test the fluid transport capability in multiple continuous formations.

[0024] Preferably, it also includes a waste liquid composition analysis system, such as a water quality analyzer or chromatograph, to analyze the changes in the composition of the injected fluid before and after the test, and to understand the flow patterns of fluids with different compositions and fluids with the same composition under different formation conditions, as well as their carrying capacity, reactivity, and transport capacity of substances within the formation.

[0025] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids, which has the following beneficial effects:

[0026] The microfluidic chip allows for real-time observation of the transport patterns of fluids with different gas-water-oil-solid-biological ratios and chemical compositions in pipelines, pores, and fissures during experiments. It also enables the observation of particulate matter carrying capacity under different apparent bubble volume ratios, flow rates, and surfactant conditions. The pressure of the experimental fluid before injection into the microfluidic chip and the pressure feedback after injection into the displacement experimental device are controlled by the experimental pump, resulting in higher precision and stability. Furthermore, this experimental device allows for microscopic observation of the fluid within the microfluidic chip during experiments, maximizing the reproduction of the original experimental environment. It provides clear observation of the fluid's movement direction and flow interface during the experiment, enabling real-time dynamic monitoring of the experimental dynamics. The flow rate of the fluid in the experimental device is controlled and adjusted by the experimental pump, allowing for fine adjustment of the multiphase fluid velocity within the relay container. Pressure feedback is obtained through fluid velocity, and the fluid is then transported from the relay container to the microfluidic control chip. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is an overall structural diagram of a visual microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids according to the present invention;

[0029] Figure 2-4 This is a structural diagram of a micro-flow control chip;

[0030] Figure 5 This is a structural diagram of the displacement test apparatus;

[0031] In the diagram, 1-fluid injection device, 11-pump 1, 12-pump 2, 13-pump 3, 2-relay container, 21-stirring device, 3-experimental platform, 4-microflow control chip, 41-fluid injection hole, 42-fluid discharge hole, 43-fluid channel, 431-first fluid channel, 432-second fluid channel, 433-third fluid channel, 5-displacement test device, 50-test specimen holder, 51-front pressure gauge, 52-rear pressure gauge, 53-displacement test specimen, 6-pipeline, 7-waste liquid collection device. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] As attached Figure 1 The described microfluidic experimental device for visualizing gas-water-oil-solid-generated multiphase and multicomponent fluids includes a fluid injection device 1 and an experimental platform 3 connected sequentially by a pipeline 6. The fluid injection device 1 includes an experimental pump. Depending on the experimental requirements, multiple experimental pumps can be set. In this embodiment, three are set, but it is not limited to this. Taking this embodiment as an example, the three experimental pumps are pump 11, pump 2, and pump 3. A microflow control chip 4 is installed on the experimental platform 3. Depending on the experimental requirements, multiple fluid injection holes 41 can be set on the microflow control chip 4. In this embodiment, two are set.

[0034] In some more improved technical solutions, a relay container 2 is also included, in which a stirrer 21 is provided. The fluid injection device 1 is connected to the inlet of the relay container 2 through the pipeline 6, and the fluid injection hole 41 provided on the micro-flow control chip 4 is connected to the outlet of the relay container 2 through the pipeline 6.

[0035] As attached Figure 1 As shown, in this embodiment, two fluid injection holes 41 are provided. One of them is connected to the relay container 2 through the pipeline 6. Pump 11 and Pump 12 are connected to the relay container 2 through pipelines. Pump 13 is directly connected to the other fluid injection hole 41 through a pipeline. However, the connection method is not limited to this. It can be configured according to different experimental requirements based on the inventive concept of this invention.

[0036] Some more improved technical solutions also include a displacement test device 5, such as Figure 5As shown, the displacement test device 5 includes a test body holder 50 and a displacement test body 53. The displacement test body 53 is installed through the test body holder 50. The displacement test body 53 includes a porous tube, a core, a pipeline, etc. The micro-flow control chip 4 is provided with a fluid discharge hole 42. The displacement test body 53 is connected to the fluid discharge hole 42 through the pipeline 6. The front and rear ends of the displacement test device 5 connected to the pipeline 6 are respectively connected to a front pressure gauge 51 and a rear pressure gauge 52 to test the breakthrough pressure of the fluid in the displacement test body 53.

[0037] Some more improved technical solutions also include a waste liquid collection device 7, which is connected to the displacement test device 5 via a pipeline 6.

[0038] In some more improved technical solutions, the fluid channels in the micro-flow control chip 4 include Y-type, U-type, grid-type, circular, and multi-layer stacked types (as shown in the attached diagram). Figure 2-4 (as shown), but not limited to this, and specific selections can be made according to experimental needs.

[0039] The application principle of this invention is as follows: The fluid injection device 1 injects the test fluid into the test device, and simultaneously controls the pressure of the test fluid by controlling the flow rate of the injected fluid. Different pumps can be used according to the differences in fluid phase and composition, and their number is unlimited, such as pump No. 1, pump No. 2, pump No. 3, ..., pump No. N, etc. The fluid from the fluid injection device 1 can be injected into the relay device 2 through the connecting pipe 6 and then into the micro-flow control chip 4 in the test platform 3, or it can be directly injected into the micro-flow control chip 4 through the connecting pipe 6. Some injected fluids need to be fully mixed according to the ratio, such as mixed solutions, solid-liquid mixtures, water-oil mixtures, etc., which need to be stirred and mixed using the stirring device 21 in the relay container 2. The micro-flow control chip 4 is clamped and fixed on the test platform 3, and the fluid flow in the chip channel is observed using equipment such as a microscope. Some tests require displacement testing. A displacement test device 5 needs to be added. The displacement test body 53 in the displacement test device 5 can be a rock core, a formation model, a porous pipe, a pipeline, etc. Its size is determined according to the test type. By observing the fluid flow in the microfluidic chip 4 that is matched with the displacement test device 5, the flow mode of the multiphase mixed fluid in the displacement fluid 4 can also be understood. After the fluid in the microfluidic control chip 4 flows through the fluid channel 43, it is discharged from the fluid discharge hole 42 through the connecting pipe 6 and connected to the displacement test device 5. The outlet of the displacement test device 5 is connected to the waste liquid collection device 7 to collect the outflowing fluid.

[0040] The connecting pipeline can be metal or plastic, connecting various functional sub-modules such as fluid injection device 1, relay container 2, microflow control chip 4, displacement test device 5 (porous media, pipeline, formation rock sample), and waste liquid collection device 7, so that the fluid can flow between the various modules.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids, characterized in that, Includes a fluid injection device and a test platform connected sequentially via pipelines: The fluid injection device includes a test pump; A micro-flow control chip is installed on the test platform; The test pump is connected to the micro-flow control chip via the pipeline; It also includes a relay container, which is equipped with a stirrer. The fluid injection device is connected to the inlet of the relay container through the pipeline, and the micro-flow control chip is connected to the outlet of the relay container through the pipeline. It also includes a displacement test device, which uses a related microflow control chip to simulate the internal passage of the displacement test device. The microflow control chip is provided with a fluid discharge hole, and the displacement test device is connected to the fluid discharge hole through the pipeline.

2. The visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids according to claim 1, characterized in that, The microflow control chip is provided with multiple fluid injection holes, and the test pump and the relay container are respectively connected to the fluid injection holes.

3. The visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids according to claim 1, characterized in that, The displacement test apparatus includes a test specimen holder and a displacement test specimen, which is mounted via the test specimen holder.

4. The visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids according to claim 1, characterized in that, The displacement test device is equipped with a front pressure gauge and a rear pressure gauge at each end.

5. The visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids according to claim 1, characterized in that, It also includes a waste liquid collection device, which is connected to the displacement test specimen via a pipeline.

6. The visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids according to claim 1, characterized in that, The fluid channels in the microflow control chip include one or more of the following: Y-type, mesh type, and multi-layer stacked type.

7. The visualized microfluidic experimental device for gas-water-oil-solid-generated multiphase and multicomponent fluids according to claim 1, characterized in that, It also includes a waste liquid composition analysis system.

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