Foam fluid long time long distance macro microcosmic coupling displacement device and system

Abstract

The application provides a foam fluid long-time long-distance macro-microscopic coupling displacement device and system, relates to the field of oilfield efficient exploitation technology, and the core tube group is connected with the injection system pipeline in the device; the support base is fixedly connected with the core tube group; a plurality of core visualized parts are arranged on the core tube group, the core tube group is coupled with a plurality of microscopic visualized modules, a visualized device is arranged on each microscopic visualized module, a porous medium area is arranged on each visualized device, and each microscopic visualized module is connected with a confining pressure system pipeline. The core tube group and the microscopic visualized module are connected with a data acquisition system through a sensor to obtain foam seepage information. The core tube group provides sufficient migration distance and migration time for the foam fluid, overcomes the end face effect of the short core displacement device, the core tube group and the microscopic visualized module monitor the migration process of the foam fluid from the macroscopic and microscopic aspects, and the problem that the long-time long-distance seepage law of the foam fluid is difficult to understand is solved.

Description

Technical Field

[0001] This application relates to the field of efficient oilfield exploitation technology, and in particular to a long-duration, long-distance macro-micro coupling displacement device and system for foam fluid. Background Technology

[0002] As my country's old oilfields enter the high water-cut stage, the contradiction between water production and oil loss during water injection development becomes prominent. Problems such as water channeling, ineffective water circulation, and uneven reservoir dynamics (both inter-layer and planar) are severe, increasing the difficulty of economical and efficient development. Foam flooding is a widely recognized water-control and oil-enhancing technology. Foam fluid, as the core technology, possesses excellent selective plugging characteristics. Its seepage resistance is high in high water-cut areas, and its plugging ability increases with permeability, thus sealing high-permeability areas and expanding the swept area. In foam chemistry systems, the foaming agent is generally a surfactant, which can reduce the oil-water interfacial tension and improve oil washing efficiency. Furthermore, foam is often used to control gas mobility. For example, when the internal phase gas is carbon dioxide, foam can significantly increase the apparent viscosity of carbon dioxide, control the mobility ratio, and improve gas channeling. Through foam fluid, not only can the recovery rate of carbon dioxide flooding be improved, but the swept volume of the formation can also be expanded, enhancing carbon sequestration.

[0003] However, foam fluids are thermodynamically unstable systems, prone to instability phenomena such as gas diffusion, liquid film bubble coalescence, liquid film drainage, and liquid film rupture, resulting in a non-uniform and unstable structural state. The migration of foam in porous formation media is a dynamic process of continuous collapse and regeneration; under undisturbed conditions, the system as a whole tends towards collapse. The instability of foam severely restricts operational effectiveness, leading to short-lived production enhancement periods for unsuccessful foam-driven hydraulic systems. Therefore, studying the stability of foam in high-temperature, high-pressure porous media in oil reservoirs is essential.

[0004] Foam stability has been extensively studied. The oil and gas industry standard (SY / T 7494-2020) evaluates stability by determining the foam half-life using the Waring Blender method. Other conventional methods include the gas flow method and the Ross-Miles method, but most are limited to static stability within containers and cannot meet the temperature and pressure conditions of oil reservoirs, nor address the influence of porous media. Foam migration in oil reservoirs is a dynamic process of continuous collapse and regeneration. Temperature, pressure, and the effects of porous media significantly influence the stability of the foam system. Evaluation methods that do not consider these comprehensive conditions cannot fully reflect the dynamic stability of foam under reservoir conditions, where it collapses and regenerates simultaneously. Summary of the Invention

[0005] This application provides a long-term, long-distance macro-micro coupling displacement device and system for foam fluid, which solves the problem that the prior art is unable to reveal the long-term, long-distance transport process and macro-micro transport laws of foam fluid.

[0006] In a first aspect, this application provides a long-term, long-distance macro-micro coupling displacement device for foam fluid, comprising: an injection system, a core tube assembly, a support base, and a confining pressure system;

[0007] The core tube assembly is connected to the injection system pipeline;

[0008] The support base is fixedly connected to the core tube assembly, and the support base is used to provide support for the core tube assembly;

[0009] The core tube assembly is provided with multiple core visualization sections and multiple micro-visualization modules. Each micro-visualization module is provided with a visualization device, and each visualization device is provided with a porous medium region.

[0010] Each of the aforementioned micro-visualization modules is connected to the confining pressure system piping;

[0011] The injection system is used to inject foam fluid into the core tube assembly, the core tube assembly is used to provide a movement path for the foam fluid, multiple core visualization units are used to display the flow of the foam fluid in the core tube assembly, and the multiple visualization devices are used to display the flow of the foam fluid in the porous media region.

[0012] In one possible design, each of the core visualization sections is provided with a first window, and multiple first windows are used to display the flow of the foam fluid in the core tube assembly.

[0013] In one possible design, the long-term, long-distance macro-micro coupling displacement device for foam fluid further includes: a data acquisition system;

[0014] The core tube assembly is also equipped with multiple monitoring and sampling modules, all of which are connected to the core tube assembly pipeline and are communicatively connected to the data acquisition system.

[0015] Each of the monitoring and sampling modules includes a temperature sensor, a pressure sensor, and a sampling valve. The temperature sensor, the pressure sensor, and the sampling valve are all connected to the core tube assembly pipeline. The temperature sensor is used to detect the temperature of the foam fluid, the pressure sensor is used to detect the pressure of the foam fluid, and the sampling valve is used to sample the foam fluid.

[0016] In one possible design, the long-duration, long-distance macro-micro coupling displacement device for foam fluid also includes: multiple cameras;

[0017] The multiple cameras are all communicatively connected to the data acquisition system. The multiple cameras are used to monitor the flow of the foam fluid in the porous medium region through the multiple visualization devices. The pore structure of the porous medium region is consistent with the pore structure in the core tube assembly.

[0018] In one possible design, each of the micro-visualization modules includes: a second window, a cover plate, a confining pressure fluid injection tube, the visualization device, and multiple connecting tubes;

[0019] The first bolt is fixedly connected to the core tube assembly through the second viewing window, and the second viewing window is provided with an observation port.

[0020] A first groove is provided between the second viewing window and the core tube assembly. In the first groove, a second bolt is fixedly connected to the core tube assembly through the cover plate. The cover plate is provided with a light-transmitting area. The multiple cameras are used to monitor the flow of the foam fluid in the porous medium area through the observation port and the light-transmitting area.

[0021] A second groove is provided between the cover plate and the core tube assembly, and the visualization device is fixedly connected to the cover plate and the core tube assembly respectively in the second groove;

[0022] The plurality of connecting pipes are fixedly connected to the visualization device and the core tube assembly, respectively. The plurality of connecting pipes are used to transmit the foam fluid in the core tube assembly to the visualization device and the foam fluid in the visualization device to the core tube assembly. The width of the plurality of connecting pipes is a preset width value, which is used to keep the foam flow rate in the visualization device consistent with the foam flow rate in the core tube assembly.

[0023] The second window is provided with a third groove on the side connected to the core tube assembly, the cover plate is provided with the side connected to the core tube assembly, and the core tube assembly is provided with the side connected to the visualization device. Each of the plurality of third grooves is provided with a sealing gasket.

[0024] In one possible design, the visualization device includes a model carrier and a model cover plate;

[0025] The model cover plate is fixedly connected to the cover plate, the model carrier plate, and the core tube assembly, respectively; the model carrier plate is fixedly connected to the core tube assembly.

[0026] The porous medium region is provided on one side of the model carrier sheet that is fixedly connected to the model cover sheet, and the plurality of connecting tubes are fixedly connected to the porous medium region through the connecting holes on the model carrier sheet.

[0027] In one possible design, a confining pressure cavity is provided between the second viewing window and the cover plate. The confining pressure liquid injection pipe is fixedly connected to the second viewing window. The confining pressure liquid injection pipe is connected to the confining pressure cavity, the confining pressure system, and the confining pressure valve pipeline, respectively. The confining pressure valve is connected to the confining pressure system pipeline. The confining pressure system is used to maintain the pressure balance on both sides of the model cover plate.

[0028] In one possible design, the core tube assembly includes multiple layers of core tubes, each layer of core tubes being provided with multiple tube body fixing sleeves;

[0029] The support base is fixedly connected to multiple bottom core tube fixing sleeves on the bottom core tube. The bottom core tube refers to the bottom core tube in the multi-layer core tube, and the multiple bottom core tube fixing sleeves refer to the fixing sleeves on the bottom core tube.

[0030] The multiple pipe fixing sleeves on two adjacent core pipe layers are fixedly connected by a pipe support frame;

[0031] Each layer of core tubes consists of multiple core tubes fixedly connected by multiple flanges.

[0032] In one possible design, the long-duration, long-distance macro-micro coupling displacement device for foam fluid further includes: a produced fluid treatment system;

[0033] The produced fluid treatment system is connected to the produced valve pipeline, and the produced valve is connected to the core tube group pipeline;

[0034] The injection system is connected to the inlet valve pipeline, and the inlet valve is connected to the core tube assembly pipeline.

[0035] Secondly, this application provides a long-term, long-distance macro-micro coupling displacement system for foam fluid, comprising: a computer, and a long-term, long-distance macro-micro coupling displacement device for foam fluid as described in the first aspect, which is communicatively connected to the computer, wherein the computer is used to store flow parameters of the foam fluid.

[0036] This application provides a long-term, long-distance macro-micro coupled displacement device and system for foam fluid. The device includes a core tube assembly connected to an injection system pipeline; a support base fixedly connected to the core tube assembly; multiple core visualization sections on the core tube assembly, coupled with multiple micro-visualization modules. Each micro-visualization module has a visualization device and a porous media region; each micro-visualization module is connected to a confining pressure system pipeline. The core tube assembly and micro-visualization modules are connected to a data acquisition system via sensors to obtain foam seepage information. The core tube assembly provides sufficient transport distance and time for the foam fluid, overcoming the end-face effect of short core displacement devices. The core tube assembly and micro-visualization modules monitor the foam fluid transport process from both macroscopic and microscopic perspectives, solving the problem of difficulty in understanding the long-term, long-distance seepage patterns of foam fluid. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 1 ;

[0039] Figure 2 Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 2 ;

[0040] Figure 3 Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 3 ;

[0041] Figure 4 Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 4 ;

[0042] Figure 5 A schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement system for foam fluid provided in the embodiments of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100-Injection System;

[0045] 101 - Inlet valve;

[0046] 200-core tube group;

[0047] 201-Core Visualization Department;

[0048] 2011 - First Window;

[0049] 202-Microscopic Visualization Module;

[0050] 2021 - Visualization Devices;

[0051] 20211 - Porous media region;

[0052] 20212 - Model slide;

[0053] 202121 - Connecting hole;

[0054] 20213 - Model cover plate;

[0055] 2022 - Second Window;

[0056] 20221 - Observation Port;

[0057] 2023 - Cover slip;

[0058] 20231 - Light-transmitting opening;

[0059] 2024 - Confining pressure fluid injection pipe;

[0060] 2025 - Connecting pipe;

[0061] 2026 - Confining pressure cavity;

[0062] 203 - Monitoring and Sampling Module;

[0063] 2031 - Temperature Sensor;

[0064] 2032 - Pressure Sensor;

[0065] 2033 - Sampling valve;

[0066] 204 - First Bolt;

[0067] 205 - Second bolt;

[0068] 206 - Pipe body fixing sleeve;

[0069] 207 - Tube support frame;

[0070] 208-Flange;

[0071] 300 - Stand base;

[0072] 400-Containing Pressure System;

[0073] 401 - Confining pressure valve;

[0074] 500 - Data Acquisition System;

[0075] 600-Camera;

[0076] 700 - Produced Fluid Treatment System;

[0077] 701 - Extraction valve;

[0078] 800-Computer. Detailed Implementation

[0079] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0080] In the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" do not necessarily imply difference. It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner. In the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more.

[0081] To facilitate a clear description of the technical solutions in the embodiments of this application, some terms and technologies involved in the embodiments of this application will be briefly introduced below:

[0082] End-face effect: This refers to the abnormal flow or pressure distribution at the two ends of a core sample due to different boundary conditions during the experiment, thus affecting the accuracy of the experimental results. This effect may cause the experimental results to fail to accurately reflect the internal flow characteristics of the sample, especially in short core experiments.

[0083] Flow patterns refer to the behavior and patterns of fluid flow in porous media, including the flow path, velocity, pressure distribution, and interaction characteristics with the medium. These patterns help researchers understand and predict how fluids move in underground rock formations, influencing geological processes such as oil and gas recovery, groundwater flow, and contaminant migration.

[0084] Thermodynamically unstable systems are those substances or systems in one state that, under changes or disturbances in external conditions, tend to spontaneously transform into another state to reduce their free energy. This instability means the system is prone to change, such as phase separation, chemical reactions, or structural reorganization, and is commonly seen in multiphase systems such as foams and emulsions.

[0085] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0086] The technical solutions of this application will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0087] To clearly understand the technical solution of this application, the existing technology solutions are first described in detail. As old oilfields in my country enter the high water-cut stage, foam flooding technology is widely used as a method for water control and oil enhancement. Its core foam system has the characteristics of selective plugging, defoaming upon contact with oil, and stabilization upon contact with water. It can provide greater seepage resistance in high water-cut areas, plug high-permeability areas, and expand the swept area, thereby improving the recovery rate. However, the effective period of foam flooding technology is usually short, ranging from a few weeks to a few months, and the instability of foam seriously restricts its construction effect. Therefore, it is essential to study the stability of foam in porous media under high temperature and high pressure conditions in oil reservoirs. In existing technologies, the oil and gas industry standard uses the Waring Blender method to determine the foam half-life to evaluate the stability of foam fluids. Other conventional methods include the gas flow method and the Ross-Miles method.

[0088] However, existing technologies have limitations in revealing the long-term, long-distance migration processes and macro- and micro-level transport patterns of foam fluids. Current techniques for studying the seepage behavior of foam fluids primarily rely on experimental methods under static conditions, such as the Waring Blender and Ross-Miles methods. These methods cannot simulate the complex effects of high-temperature, high-pressure environments and porous media in oil reservoirs. Furthermore, short core experiments, due to end-face effects and size limitations, cannot accurately reflect the long-distance migration and dynamic stability of foam in reservoirs, resulting in a lack of comprehensive understanding of the migration processes and patterns of foam fluids under actual oil reservoir conditions.

[0089] Therefore, addressing the difficulty in revealing the long-term, long-distance migration process and macro- and micro-scale migration laws of foam fluids in existing technologies, this study found that a solution can be achieved by developing a high-temperature, high-pressure dynamic experimental device and a long core experimental method to realistically simulate the foam migration process under reservoir conditions: ① By lengthening the core tube, sufficient migration distance and time are provided for the foam fluid. ② Multiple observation modules with different observation angles are set up at different locations in the core tube to observe the changes in the foam fluid during migration. ③ Multiple sensors are installed on the core tube to monitor the parameter changes of the foam fluid during migration within the long core tube.

[0090] Specifically, longer core tubes can be designed to simulate the seepage environment in porous media, multiple macroscopic and microscopic observation modules can be set up to observe the migration and changes of foam fluid in real time, and multiple sensors can be installed on the core tube to monitor flow parameters such as temperature, pressure and flow rate, so as to comprehensively analyze the migration characteristics of foam fluid in long core tubes and realistically simulate the foam migration process under reservoir conditions.

[0091] This application discloses a long-term, long-distance macro-micro coupled displacement device and system for foam fluid. The device includes a core tube assembly connected to an injection system pipeline; a support base fixedly connected to the core tube assembly; multiple core visualization sections on the core tube assembly, coupled to multiple micro-visualization modules. Each micro-visualization module has a visualization device and a porous media region; each micro-visualization module is connected to a confining pressure system pipeline. The core tube assembly and micro-visualization modules are connected to a data acquisition system via sensors to obtain foam seepage information. The core tube assembly provides sufficient transport distance and time for the foam fluid, overcoming the end-face effect of short core displacement devices. The core tube assembly and micro-visualization modules monitor the foam fluid transport process from both macroscopic and microscopic perspectives, solving the problem of difficulty in understanding the long-term, long-distance seepage patterns of foam fluid.

[0092] Based on the above-mentioned inventive discovery, the technical solution of this application is proposed.

[0093] The embodiments of this application are described below with reference to the accompanying drawings.

[0094] Figure 1 Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 1 , Figure 2 Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 2 , Figure 3 Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 3 , Figure 4Schematic diagram of the structure of the long-duration, long-distance macro-micro coupling displacement device for foam fluid provided in the embodiments of this application. Figure 4 ,like Figures 1 to 4 As shown, in this embodiment... Figures 1 to 4 Based on the embodiments, the long-term, long-distance macro-micro coupled displacement device for foam fluid is described in detail. In this embodiment, the long-term, long-distance macro-micro coupled displacement device for foam fluid includes: an injection system 100, a core tube assembly 200, a support base 300, and a confining pressure system 400.

[0095] Specifically, the long-duration, long-distance macro-micro coupled displacement device for foam fluid achieves its function by integrating an injection system 100, a core tube assembly 200, a support base 300, and a confining pressure system 400. The injection system 100 is responsible for precisely injecting the foam fluid into the core tube assembly 200, which in turn provides a controlled environment to simulate the flow path of the foam fluid. The support base 300 provides the necessary physical support and stability for the core tube assembly 200. The confining pressure system 400 is used to adjust and control the pressure conditions within the device to simulate different formation environments, thereby helping researchers understand the displacement behavior and mechanisms of foam fluid in porous media.

[0096] The core tube assembly 200 is connected to the injection system 100 via pipeline.

[0097] Specifically, the core tube assembly 200 can be connected to the injection system 100 through the inlet pipeline to ensure that the foam fluid can be accurately delivered to the core tube assembly 200. This connection method can ensure that the foam fluid can flow into the core tube assembly 200 stably and continuously during the use of the device, thereby ensuring the accuracy and reliability of data acquisition.

[0098] For example, the core tube assembly 200 can be designed as a rectangular loop, with 4 to 6 layers. The inner diameter of each core tube layer can be 2.5 to 15 centimeters, and the spacing between each layer of core tubes is 2 to 3 centimeters. The core tube assembly 200 can be spirally coiled and stacked, with both ends connected to the injection system 100 and the produced fluid treatment system 700 respectively via pipelines. This design can simulate the seepage situation of the foam system in a 30 to 80-meter core.

[0099] The support base 300 is fixedly connected to the core tube assembly 200, and the support base 300 is used to provide support for the core tube assembly 200.

[0100] Specifically, the support base 300 can be designed as a stable platform, and the core tube assembly 200 can be securely installed on the support base 300 using bolts, clamps, or welding to ensure the stability of the core tube assembly 200 during equipment use. The support base 300 can bear the weight of the core tube assembly 200, providing the necessary physical support and stability.

[0101] The core tube assembly 200 is equipped with multiple core visualization sections 201 and multiple micro-visualization modules 202. Each micro-visualization module 202 is equipped with a visualization device 2021, and each visualization device 2021 is equipped with a porous medium region 20211.

[0102] Specifically, the core tube assembly 200 can integrate a core visualization section 201 made of transparent or translucent material, allowing researchers to directly observe the flow of foam fluid. The microscopic visualization module 202 can contain a specially designed visualization device 2021, on which porous media regions 20211 are set. These regions consist of multiple pores, simulating the structure of porous media to study the flow behavior of foam fluid within them. The overall design is used to study the flow characteristics of foam fluid in porous media, providing visualization and data support for studying fluid displacement processes.

[0103] Each micro-visualization module 202 is connected to the confining pressure system 400 piping.

[0104] Specifically, the microscopic visualization module 202 can be connected to the confining pressure system 400 via pipelines, and the mechanical stability of the observation area can be maintained through closed-loop feedback. This design is mainly used to ensure the pressure balance inside and outside the porous medium region 20211 during the experiment.

[0105] The injection system 100 is used to inject foam fluid into the core tube assembly 200, the core tube assembly 200 is used to provide a movement path for the foam fluid, multiple core visualization units 201 are used to display the flow of foam fluid in the core tube assembly 200, and multiple visualization devices 2021 are used to display the flow of foam fluid in the porous media region 20211.

[0106] This embodiment provides a long-term, long-distance macro-micro coupled displacement device for foam fluid. The device includes a core tube assembly connected to an injection system pipeline; a support base fixedly connected to the core tube assembly; multiple core visualization sections on the core tube assembly, coupled with multiple micro-visualization modules. Each micro-visualization module has a visualization device and a porous media region; each micro-visualization module is connected to a confining pressure system pipeline. The core tube assembly and micro-visualization modules are connected to a data acquisition system via sensors to obtain foam seepage information. The core tube assembly provides sufficient transport distance and time for the foam fluid, overcoming the end-face effect of short core displacement devices. The core tube assembly and micro-visualization modules monitor the foam fluid transport process from both macroscopic and microscopic perspectives, solving the problem of difficulty in understanding the long-term, long-distance seepage patterns of foam fluid.

[0107] In one possible design, each core visualization section 201 is provided with a first window 2011, and multiple first windows 2011 are used to display the flow of foam fluid in the core tube assembly 200.

[0108] Specifically, the core visualization section 201 can employ a first viewing window 2011 made of transparent or translucent material, allowing researchers to directly observe the flow of foam fluid within the core tube assembly. This design ensures the clarity of the first viewing window 2011 during device use, thus providing lasting visualization.

[0109] For example, the first viewing window 2011 can be bolted to the side of the core tube assembly 200. A sealing ring can be installed between the first viewing window 2011 and the core tube assembly 200. The first viewing window 2011 can be 5 to 15 cm long and 1 to 3 cm wide. The first viewing window 2011 is used to display the flow morphology characteristics of the fluid inside the core tube assembly 200, and in conjunction with the monitoring and sampling module 203, evaluates the fluid composition at this location and analyzes the fluid transport patterns under long-term and long-distance conditions. The center of the first viewing window 2011 can be a layer of pressure-resistant and wear-resistant sapphire glass, which can prevent the visualization effect from being affected by the porous media such as core or quartz sand inside the core tube assembly 200.

[0110] The technical advantages of this embodiment are as follows: By setting a viewing window on the core visualization section, real-time visual observation of the macroscopic flow process of foam fluid within the core tube assembly is achieved. This window allows researchers to directly observe the morphological changes, flow front advancement, and distribution of foam during long-distance migration, effectively overcoming the shortcomings of traditional closed core tubes that cannot intuitively obtain fluid dynamic information. This observation method provides direct visual evidence for analyzing the migration patterns of foam under simulated formation conditions.

[0111] In one possible design, the long-term, long-distance macro-micro coupling displacement device for foam fluid also includes: a data acquisition system 500.

[0112] Specifically, the data acquisition system 500 can communicate with multiple monitoring and sampling modules 203 in the device via a communication interface. The data acquisition system 500 can monitor the operating parameters of the foam fluid in real time for further analysis, ensuring the accuracy of the experimental process.

[0113] The core tube assembly 200 is also equipped with multiple monitoring and sampling modules 203, all of which are connected to the pipeline of the core tube assembly 200 and are also connected to the data acquisition system 500.

[0114] Specifically, multiple monitoring and sampling modules 203 on the core tube assembly 200 are connected to the core tube assembly 200 via pipelines and to the data acquisition system 500 via wired or wireless communication. Each monitoring and sampling module 203 integrates multiple sensors that monitor key parameters of the foam fluid in real time and transmit the data to the data acquisition system 500. The data acquisition system 500 collects and processes this data, providing real-time monitoring and analysis support for the behavior of the foam fluid during the experiment.

[0115] Each monitoring and sampling module 203 includes a temperature sensor 2031, a pressure sensor 2032, and a sampling valve 2033. The temperature sensor 2031, pressure sensor 2032, and sampling valve 2033 are all connected to the core tube assembly 200 pipeline. The temperature sensor 2031 is used to detect the temperature of the foam fluid, the pressure sensor 2032 is used to detect the pressure of the foam fluid, and the sampling valve 2033 is used to sample the foam fluid.

[0116] Specifically, each monitoring and sampling module 203 can be connected to the pipeline of the core tube assembly 200 via mechanical and electronic interfaces to achieve real-time monitoring of the foam fluid. Temperature sensor 2031 and pressure sensor 2032 are respectively installed at appropriate locations in the pipeline to directly contact the fluid and acquire its temperature and pressure data.

[0117] For example, temperature sensor 2031 and pressure sensor 2032 can be connected to the core tube assembly 200 via mounting brackets to monitor the temperature and pressure at various points within the core tube assembly 200. Sampling valve 2033 can take a small amount of foam fluid each time without affecting the internal seepage state of the core tube assembly 200. Sampling valve 2033 is used for observational sampling to analyze the composition of the foam fluid at the sampling point, aiding in the analysis of the migration patterns of the foam system in porous media under high temperature and high pressure conditions.

[0118] The technical advantages of this embodiment are as follows: By setting up an integrated monitoring and sampling module, multi-parameter dynamic monitoring and precise sampling of foam fluid during long core displacement are achieved. Coordinated monitoring of temperature and pressure allows for real-time acquisition of thermodynamic parameters and flow characteristics during fluid migration, while the sampling valve configuration allows for the collection of fluid samples at any stage for subsequent analysis. This design overcomes the limitation of traditional devices that can only acquire endpoint data, accurately reflecting the performance evolution of foam at different migration distances, and providing complete experimental data support for establishing a correlation model between foam stability and formation environmental parameters.

[0119] In one possible design, the long-duration, long-distance macro-micro coupling displacement device for foam fluid also includes: multiple cameras 600.

[0120] Specifically, multiple cameras 600 can be mounted externally to the core tube assembly 200, near the microscopic visualization module 202, to capture the flow of foam fluid in the porous media region 20211 in real time. The cameras 600 can communicate with the data acquisition system 500 via wired or wireless means to transmit video and image data. This design aims to provide intuitive visual monitoring, enabling researchers to observe and analyze the dynamic behavior of foam fluid in the porous media in real time.

[0121] Multiple cameras 600 are communicatively connected to the data acquisition system 500. The multiple cameras 600 are used to monitor the flow of foam fluid in the porous medium region 20211 through multiple visualization devices 2021. The pore structure of the porous medium region 20211 is consistent with the pore structure in the core tube group 200.

[0122] Specifically, multiple cameras 600 can be connected to the data acquisition system 500 via wired or wireless communication to achieve real-time data transmission and processing. Each camera 600 can be placed near the microscopic visualization module 202 to directly observe the foam fluid flow in the porous media region 20211 through the visualization device 2021. The pore structure of the porous media region 20211 is designed to be consistent with the pore structure within the core tube assembly 200 to ensure the representativeness and comparability of the observed flow behavior. This setup provides real-time visual monitoring of the foam fluid flow behavior at the microscale, helping researchers analyze the migration characteristics of fluids in porous media.

[0123] For example, camera 600 can be a microscopic camera, with the objective lens of the microscopic camera facing the visualization device 2021 on the microscopic visualization module 202. The microscopic camera can be connected to the data acquisition system 500 via a data cable. The microscopic camera is used to monitor and record the seepage inside the visualization device 2021 in the microscopic visualization module 202.

[0124] The technical advantages of this embodiment are as follows: By configuring cameras connected to the data acquisition system, dynamic capture and recording of the microscopic flow behavior of foam fluid in porous media are achieved. These high-precision camera devices, through the observation windows of visualization devices, can clearly present microscopic seepage phenomena such as the generation, deformation, and rupture of foam in the pore structure. The captured pore-level flow images complement the macroscopic observation data. In particular, by strictly matching the pore structure of the porous media region with that of the actual core, the representativeness of the microscopic observation results to the actual reservoir conditions is ensured, providing direct visual evidence for revealing the intrinsic relationship between foam stability and pore structure.

[0125] In one possible design, the core tube assembly 200 includes multiple core tubes, each core tube having multiple tube fixing sleeves 206.

[0126] Specifically, multiple tube fixing sleeves 206 can be evenly installed on the outer surface of each core tube layer. These tube fixing sleeves 206 can be firmly attached to the core tubes by welding or bolting to ensure the vertical stability and alignment of each core tube layer. This design provides structural support and fixation for multiple layers of core tubes, ensuring that each core tube layer maintains a stable arrangement and position during the use of the device, thereby improving the stability of the device. In addition, this design facilitates the disassembly and assembly of the core tubes, making maintenance convenient.

[0127] The support base 300 is fixedly connected to multiple bottom core tube fixing sleeves 206 on the bottom core tube. The bottom core tube refers to the bottom core tube in the multi-layer core tube, and the multiple bottom core tube fixing sleeves 206 refer to the fixing sleeves on the bottom core tube.

[0128] Specifically, the support base 300 can be securely connected to multiple bottom core tube fixing sleeves 206 on the bottom core tube using mechanical connection methods such as bolts, welding, or clamps. This connection method ensures the stability of the bottom core tube in the device, enabling it to withstand various forces generated during the experiment. Through this structure, the entire core tube assembly can maintain stable positioning and alignment, thereby ensuring the safety and durability of the device during operation.

[0129] Multiple tube fixing sleeves 206 on two adjacent core tube layers are fixedly connected by tube support frames 207.

[0130] Specifically, mounting interfaces can be designed on each tube fixing sleeve 206, and these interfaces can be connected using tube support frames 207. The tube support frames 207 can be made of metal or other high-strength materials to ensure sufficient support and stability during connection. This design securely connects adjacent core tube layers vertically, ensuring alignment and stability during device use and preventing displacement or tilting due to vibration or pressure changes.

[0131] For example, 4 to 8 supports can be installed on the support base 300 to support the core tube assembly 200. A tube support frame 207 can be installed at 2-meter intervals between adjacent layers of core tubes in the core tube assembly 200. The tube support frame 207 can secure the core tube assembly 200 to the tube body through the tube fixing sleeve 206. The tube support frame 207 is used to support adjacent layers of core tubes and prevent collisions between the core tubes.

[0132] Each core tube layer consists of multiple core tubes fixedly connected by multiple flanges 208.

[0133] Specifically, this can be achieved by designing flange interfaces at both ends of each core tube and using bolts or nuts to tightly connect the flanges 208 of adjacent core tubes. The flange connection provides a reliable mechanical connection capable of withstanding stress under high pressure and high temperature conditions, while allowing for easy disassembly and reassembly when needed. This design ensures the stability and sealing of each core tube layer, prevents fluid leakage, and provides a continuous flow path, thereby maintaining fluid integrity during equipment operation.

[0134] The technical advantages of this embodiment are as follows: Through the multi-layer core tube structure design, combined with the connection methods of the tube fixing sleeve, tube support frame, and flanges, a stable and adjustable operating platform is provided. The combination of the tube fixing sleeve and support frame ensures the stable arrangement of each layer of core tubes, preventing displacement and tilting. The flange connection provides reliable sealing and structural integrity, ensuring no fluid leakage during device operation. This design improves the stability and safety of the device, ensures the accuracy and repeatability of the collected fluid data, and facilitates the assembly and maintenance of the device.

[0135] In one possible design, the long-duration, long-distance macro-micro coupling displacement device for foam fluid also includes: a produced fluid treatment system 700.

[0136] Specifically, the produced fluid treatment system 700 can be connected to the outlet pipeline of the device to treat the foam fluid discharged from the device to separate and recover useful components or treat waste liquid, thereby optimizing resource utilization and reducing environmental impact.

[0137] The produced fluid treatment system 700 is connected to the produced valve 701 via pipeline, and the produced valve 701 is connected to the core tube assembly 200 via pipeline.

[0138] Specifically, the produced fluid treatment system 700 can be connected to the produced valve 701 via a pipeline, and the produced valve 701 is connected to the outlet pipeline of the core tube assembly 200. This connection method enables the foam fluid discharged from the core tube assembly 200 to be guided to the produced fluid treatment system 700 for treatment, to separate and recover useful components in the foam fluid or to treat waste liquid.

[0139] The injection system 100 is connected to the inlet valve 101 via pipeline, and the inlet valve 101 is connected to the core tube assembly 200 via pipeline.

[0140] Specifically, the injection system 100 can be connected to the inlet valve 101 via a pipeline, and the inlet valve 101 is connected to the inlet pipeline of the core assembly 200. This connection method enables the precise and controlled delivery of foam fluid from the injection system 100 to the core assembly 200. The inlet valve 101 is used to regulate and control the fluid inflow rate, ensuring the stability and controllability of experimental conditions, thereby supporting the study of the flow behavior of foam fluid in porous media.

[0141] The technical advantages of this embodiment are as follows: By configuring an independent produced fluid treatment system and a two-way fluid control system, closed-loop management and precise control of the entire displacement experiment process are achieved. The coordination between the injection system and the inlet valve ensures that the foam fluid is stably injected into the core tube assembly according to the set parameters, while the produced fluid treatment system guided by the produced valve can collect and professionally process the displacement products in real time. This two-way fluid control architecture completely simulates the oilfield injection and production process, providing a reliable end-point guarantee for studying the migration law of foam fluid in long core tubes.

[0142] In one possible design, each micro-visualization module 202 includes: a second window 2022, a cover plate 2023, a confining pressure liquid injection tube 2024, a visualization device 2021, and multiple connecting tubes 2025.

[0143] Specifically, the second viewing window 2022 can be installed outside the microscopic visualization module 202, providing a transparent and pressure-resistant observation window. The cover plate 2023 can be located below the second viewing window 2022, forming a sealed connection with the core tube assembly 200 to ensure the integrity of the light-transmitting area. The confining pressure fluid injection pipe 2024 is connected to the second viewing window 2022 to maintain internal pressure balance. The visualization device 2021 is embedded between the cover plate 2023 and the core tube assembly 200, and is connected to the core tube assembly 200 through multiple connecting pipes 2025, allowing foam fluid to flow inside and outside the visualization device 2021.

[0144] The first bolt 204 is fixedly connected to the core tube assembly 200 through the second viewing window 2022, and the second viewing window 2022 is provided with an observation port 20221.

[0145] Specifically, the first bolt 204 securely fixes the second viewing window 2022 to the core tube assembly 200, ensuring its stability and sealing under high pressure conditions. The second viewing window 2022 is made of a transparent and pressure-resistant material and has an observation port 20221, allowing researchers to directly observe the flow of foam fluid in the porous media region 20211 through this window.

[0146] A first groove is provided between the second viewing window 2022 and the core tube assembly 200. In the first groove, the second bolt 205 is fixedly connected to the core tube assembly 200 through the cover plate 2023. The cover plate 2023 is provided with a light-transmitting port 20231. Multiple cameras 600 are used to monitor the flow of foam fluid in the porous medium region 20211 through the observation port 20221 and the light-transmitting port 20231.

[0147] Specifically, a first groove can be precisely machined on the contact surface between the core tube assembly 200 and the second viewing window 2022 to accommodate the second viewing window 2022. A second bolt 205 is used to fix the cover plate 2023 to the core tube assembly 200, ensuring a secure connection. The cover plate 2023 has a light-transmitting opening 20231, which is made of a transparent material to allow light to pass through, thereby enabling visual observation of the internal fluid flow. This design provides a clear observation window while ensuring structural stability and sealing, allowing researchers to monitor the flow status of fluid within the porous media region 20211 in real time.

[0148] For example, the cover plate 2023 can be a square metal block, with its center hollowed out and filled with a light-transmitting material to serve as a light-transmitting opening 20231. The cover plate 2023 is fixed in the groove by a second bolt 205, pressing the visualization device 2021 firmly. A buffer washer can be placed at the contact point between the cover plate 2023 and the visualization device 2021 to prevent hard contact that could crush the visualization device 2021, thus providing a controlled microenvironment that allows researchers to observe and analyze the flow behavior of foam fluid within the microporous structure.

[0149] A second groove is provided between the cover plate 2023 and the core tube assembly 200. In the second groove, the visualization device 2021 is fixedly connected to the cover plate 2023 and the core tube assembly 200 respectively.

[0150] Specifically, a second groove can be precisely machined on the contact surface of the core tube assembly 200 and the cover plate 2023 to accommodate the cover plate 2023 and the visualization device 2021. The visualization device 2021 is embedded in the second groove and securely connected to the cover plate 2023 and the core tube assembly 200 by means of adhesives or micro-bolts. This design ensures the stability of the visualization device 2021 during device use and provides a controlled microenvironment, enabling researchers to observe and analyze the flow behavior of foam fluid in the microporous structure.

[0151] For example, a square stepped groove can be provided on the core tube assembly 200. The visualization device 2021 is located at the bottom layer of the square stepped groove. Multiple connecting tubes 2025 can be provided in the bottom groove. The cover plate 2023 can be located in the middle of the square stepped groove and is fixedly connected to the visualization device 2021. The second viewing window 2022 can be located at the outermost layer of the square stepped groove, forming a space with a thickness of 2 to 4 cm with the cover plate 2023 as a confining pressure cavity 2026.

[0152] Multiple connecting pipes 2025 are fixedly connected to the visualization device 2021 and the core tube assembly 200, respectively. The multiple connecting pipes 2025 are used to transfer the foam fluid in the core tube assembly 200 to the visualization device 2021 and the foam fluid in the visualization device 2021 to the core tube assembly 200. The width of the multiple connecting pipes 2025 is a preset width value, which is used to keep the foam flow rate in the visualization device 2021 consistent with the foam flow rate in the core tube assembly 200.

[0153] Specifically, the connecting pipes 2025 are precision-machined and sealed to preset interfaces on the visualization device 2021 and the core tube assembly 200, ensuring a robust and airtight connection. These connecting pipes 2025 allow the foam fluid to flow freely between the visualization device 2021 and the core tube assembly 200, enabling continuous monitoring of fluid flow in different structures. The width of the connecting pipes 2025 is designed to a specific preset width value to ensure that the foam flow rate in the visualization device 2021 remains consistent with the foam flow rate in the core tube assembly 200 during transmission. This design accurately simulates the flow conditions within the core tube assembly in the visualization device, providing reliable micro-flow observation data and supporting in-depth research on foam fluid behavior. Only trace amounts of fluid flow into the porous media region 20211, thus not affecting the seepage state inside the core tube assembly 200.

[0154] A third groove is provided on the side where the second window 2022 is connected to the core tube assembly 200, the side where the cover plate 2023 is connected to the core tube assembly 200, and the side where the core tube assembly 200 is connected to the visualization device 2021. Each of the multiple third grooves is provided with a sealing gasket.

[0155] Specifically, a third groove can be precisely machined into the contact surface of each connection point to accommodate a sealing gasket. The sealing gasket is embedded in these grooves, ensuring an effective seal when components are connected. This design prevents fluid leakage and ensures the system's tightness and safety under high-pressure conditions. In this way, the device can maintain a stable internal environment during foam fluid flow experiments, providing reliable experimental data.

[0156] The technical advantages of this embodiment are as follows: the use of a split-type viewing window and a groove seal, combined with precision bolts, ensures both optical transparency and high-pressure sealing; the unique confining pressure cavity design balances the internal and external pressure difference, preventing window deformation from affecting imaging quality; and the multi-level sealing gaskets and precisely aligned light-transmitting areas effectively eliminate leakage and image distortion problems associated with traditional observation devices, providing a reliable observation platform for long-term, high-precision microscopic dynamic studies of foam; the widths of multiple connecting pipes are set to specific preset width values, enabling precise reproduction of flow conditions within the core tube assembly in the visualization device, avoiding flow rate variations caused by differences in pipe size, thereby providing reliable experimental data and helping to improve the accuracy and repeatability of experimental results.

[0157] In one possible design, a confining pressure chamber 2026 is provided between the second viewing window 2022 and the cover plate 2023. The confining pressure liquid injection pipe 2024 is fixedly connected to the second viewing window 2022. The confining pressure liquid injection pipe 2024 is connected to the confining pressure chamber 2026, the confining pressure system 400 and the confining pressure valve 401 respectively. The confining pressure valve 401 is connected to the confining pressure system 400. The confining pressure system 400 is used to maintain the pressure balance on both sides of the model cover plate 20213.

[0158] Specifically, the confining pressure chamber 2026 between the second viewing window 2022 and the cover plate 2023 is fluidly connected to an external system via a confining pressure liquid injection pipe 2024. The confining pressure liquid injection pipe 2024 is fixedly connected to the second viewing window 2022 and is connected via pipelines to the confining pressure chamber 2026, the confining pressure system 400, and the confining pressure valve 401 to control the injection of confining pressure liquid. The confining pressure system 400 maintains pressure balance on both sides of the model cover plate 20213 by adjusting the confining pressure, ensuring the stability and accuracy of fluid flow during the experiment, thereby improving the reliability of the experimental results.

[0159] For example, the space with a thickness of 2 to 4 cm enclosed between the second viewing window 2022 and the cover plate 2023 can be used as a confining pressure chamber 2026. The internal fluid of the confining pressure chamber 2026 is controlled by the confining pressure fluid injection pipe 2024, the purpose of which is to provide confining pressure and ensure pressure balance on both sides of the visualization device 2021. A confining pressure chamber sealing gasket can be installed at the connection position between the second viewing window 2022 and the core tube assembly 200, the purpose of which is to prevent leakage of high-pressure fluid in the confining pressure chamber 2026. The confining pressure fluid injection pipe 2024 can be connected to the confining pressure system 400 for fluid supply via a confining pressure fluid pipeline.

[0160] The technical advantage of this embodiment is that by setting up a confining pressure chamber and using a confining pressure system to adjust the pressure within the chamber, precise control of the pressure inside the chamber can be achieved. This design can protect the structural integrity of the visualization component under high pressure and prevent damage caused by uneven pressure.

[0161] In one possible design, the visualization device 2021 includes a model carrier 20212 and a model cover plate 20213.

[0162] Specifically, the model carrier 20212 and the model cover plate 20213 can be synthesized into a visualization device 2021 via hotbonding, forming a porous medium region 20211 on the side of the model carrier 20212 near the model cover plate 20213. This design is used to simulate and observe the flow behavior of foam fluid in a porous medium. The model carrier 20212 has a connecting hole 202121, allowing the foam fluid to enter and exit the porous medium region 20211 through the connecting pipe 2025, thereby enabling control and study of the fluid flow path.

[0163] The model cover plate 20213 is fixedly connected to the cover plate 2023, the model carrier plate 20212 and the core tube assembly 200 respectively, and the model carrier plate 20212 is fixedly connected to the core tube assembly 200.

[0164] Specifically, one side of the model cover plate 20213 can be connected to the cover plate 2023, and the other side of the model cover plate 20213 can be connected to the side of the model carrier plate 20212 with the porous media region 20211. The side of the model carrier plate 20212 without the porous media region 20211 can be connected to the core tube assembly 200. The connection between the model carrier plate 20212 and the core tube assembly 200 ensures the stability and integrity of the entire structure. This design is intended to provide a stable environment during the use of the device to accurately simulate and observe the flow behavior of foam fluid in porous media, while ensuring structural integrity under high pressure conditions.

[0165] A porous medium region 20211 is provided on one side of the model carrier 20212 that is fixedly connected to the model cover 20213. Multiple connecting pipes 2025 are fixedly connected to the porous medium region 20211 through the connecting holes 202121 on the model carrier 20212.

[0166] Specifically, a porous medium region 20211 with a specific geometry and pore structure can be precisely fabricated on a model carrier 20212. Pre-designed and fabricated connecting holes 202121 on the model carrier 20212 allow a connecting pipe 2025 to be directly connected to the porous medium region 20211. This design can simulate the fluid flow path in a porous medium, enabling foam fluid to enter and exit the porous medium region 20211 through the connecting pipe 2025, thereby facilitating the study of fluid flow behavior within the microstructure.

[0167] For example, the visualization device 2021 can be formed by thermally bonding a model carrier 20212 and a model cover plate 20213. The side lengths of the model carrier 20212 and the model cover plate 20213 can be 2 to 4 centimeters. A porous medium region 20211 can be set on the model carrier 20212. The model carrier 20212 and the model cover plate 20213 sandwich the porous medium region 20211 in the middle. A connecting hole 202121 can be set on the model carrier 20212 to connect with multiple connecting tubes 2025. The width of the multiple connecting tubes 2025 can be 10 to 1000 micrometers, and the length can be 1 to 10 centimeters. One end of the multiple connecting tubes 2025 can be connected to the porous medium region 20211 through the connecting hole 202121, and the other end can be connected to the core tube assembly 200. Multiple connecting pipes 2025 can guide the foam fluid in the core tube assembly 200 to the porous media region 20211, and can also guide the fluid in the porous media region 20211 to the core tube assembly 200. By designing the width of the multiple connecting pipes 2025, the flow rate of the foam fluid in the visualization device 2021 can be ensured to be similar to the flow rate of the foam fluid in the corresponding core tube assembly 200, ensuring that the visualization device 2021 can accurately reflect the microscopic seepage law of the foam fluid in the porous media region 20211.

[0168] The technical advantages of this embodiment are as follows: The double-layer slide structure design enables the detachable replacement and high-precision observation of the porous media micro-model. The combined assembly of the model slide and cover plate ensures stable encapsulation of the porous media region and facilitates the replacement of pore structure parameters according to different experimental needs. The precisely etched porous media region on the slide surface maintains geometric similarity to the core pores, making the micro-flow observation representative of a real oil reservoir. Furthermore, the specially designed connecting channels achieve seamless fluid connection between the macroscopic core tube and the microscopic observation area, providing a reliable experimental platform for studying the dynamic evolution of foam in a real pore structure.

[0169] Figure 5 This is a schematic diagram of the structure of a long-duration, long-distance macro-micro coupled displacement system for foam fluid provided in an embodiment of this application. Figure 5 As shown, in this embodiment, the long-term, long-distance macro-micro coupled displacement system for foam fluid includes: a computer 800, and a device communicatively connected to the computer 800, such as... Figures 1 to 4 A long-term, long-distance macro-micro coupling displacement device for foam fluid, with a computer 800 used to store the flow parameters of the foam fluid.

[0170] Specifically, the computer 800 can be connected to the various data acquisition systems 500 of the long-term, long-distance macro-micro coupling and displacement device for foam fluid via wired or wireless communication interfaces. The computer 800 can be configured with corresponding software to receive, store, and process foam fluid flow parameters, such as temperature and pressure, transmitted from the data acquisition system 500.

[0171] The technical advantages of this embodiment are as follows: By integrating the long-term, long-distance macro-micro coupling displacement device for foam fluid with a computer, real-time acquisition, storage, and analysis of experimental data are achieved. The computer can not only efficiently manage and store flow parameters, but also process and visualize this data in real time. This integrated system improves the automation and data management capabilities of foam fluid research experiments, ensures the accuracy and integrity of data, and provides researchers with convenient tools to analyze experimental results and optimize experimental conditions, thereby enhancing experimental efficiency and research depth.

[0172] It should be noted that:

[0173] The long-term, long-distance macro-micro coupled displacement device for foam fluid provided in this application can simulate the long-term, long-distance transport of foam fluid in porous media regions under high temperature and high pressure conditions, including the following steps:

[0174] Multi-layer core tubes are connected by flanges 208 to form a core tube assembly 200. Multiple tube fixing sleeves 206 are installed on the core tube assembly 200. Tube support frames 207 are installed between the tube fixing sleeves 206 of adjacent core tube layers. The tube support frame 207 on the bottom core tube is fixedly connected to the support base 300. Multiple cameras 600 and multiple data acquisition systems 500 are connected to a computer 800 via wires. The model carrier 20212 and the model cover 20213 are hotkeyed to synthesize a visualization device 2021.

[0175] A stepped groove is provided on the core tube assembly 200. In the stepped groove, the visualization device 2021 is first installed in the groove between the cover plate 2023 and the core tube assembly 200. Then, the cover plate 2023 is fixed to the core tube assembly 200 by the second bolt 205. Finally, the second window 2022 is fixed to the core tube assembly 200 by the first bolt 204.

[0176] Connect the inlet of the core tube assembly 200 to the injection system 100 equipped with the high-pressure inlet valve 101, and connect the outlet of the core tube assembly 200 to the produced fluid treatment system 700 equipped with the produced fluid valve 701. Open the inlet valve 101, close the other valves, and inject high-pressure fluid into the inlet of the core tube assembly 200 to perform pressure build-up treatment. Set the pressure to 1.5 times the maximum operating pressure and maintain the operating pressure for 30 to 40 minutes. The qualified standard is no punctures or leaks.

[0177] Then, the confining pressure valve 401 and the back pressure valve 501 are opened, and the confining pressure system 400 introduces confining pressure fluid into the confining pressure chamber 2026 through the confining pressure fluid injection pipe 2024.

[0178] High-temperature and high-pressure fluid is injected into the core tube assembly 200 and pressurized and heated to the set pressure. After the high-temperature and high-pressure fluid flows into the visualization device 2021 from multiple connecting pipes 2025, the microscopic visualization module 202 is observed to see if it is working properly.

[0179] Based on actual production needs, foam fluid is introduced into the inlet of the core tube assembly 200. After traveling a long distance through the core tube, the macroscopic flow of the foam fluid within the core tube assembly 200 can be observed on the first viewing window 2011 of the core visualization section 201. Multiple cameras 600 can also monitor the microscopic flow of the foam fluid in the porous medium region 20211 through the observation port 20221 and the light-transmitting port 20231. Simultaneously, the temperature sensor 2031 and the pressure sensor 2032 can measure the flow parameters of the foam fluid, such as temperature and pressure, and send these flow parameters to the computer 800. The sampling valve 2033 can extract samples from the flow path of the foam fluid and send the sample parameters to the computer 800. The computer 800 can store and analyze these flow parameters and sample parameters to obtain the composition and properties of the foam fluid in different parts of the core tube assembly 200.

[0180] The foam fluid flowed through multiple microscopic visualization modules 202 at different locations, and multiple tests were conducted. Based on the results of these tests, the long-term and long-distance transport patterns of foam in porous media under high temperature and high pressure conditions were analyzed. Finally, the production valve 701 was opened, and the foam fluid was discharged from the core tube group 200 to the produced fluid treatment system 700.

[0181] Depressurize the long-duration, long-distance macro-micro coupled displacement device for foam fluid, drain the residual fluid, inject clean water to clean the core tube assembly 200, and disassemble the long-duration, long-distance macro-micro coupled displacement device for foam fluid.

[0182] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A long-duration, long-distance macro-micro coupling displacement device for foam fluid, characterized in that, include: Injection system (100), core tube assembly (200), support base (300), confining pressure system (400); The core tube assembly (200) is connected to the injection system (100) via pipeline; The support base (300) is fixedly connected to the core tube assembly (200), and the support base (300) is used to provide support for the core tube assembly (200); The core tube assembly (200) is provided with multiple core visualization sections (201) and multiple micro-visualization modules (202). Each micro-visualization module (202) is provided with a visualization device (2021), and each visualization device (2021) is provided with a porous medium region (20211). Each of the aforementioned micro-visualization modules (202) is connected to the confining pressure system (400); The injection system (100) is used to inject foam fluid into the core tube assembly (200), the core tube assembly (200) is used to provide a movement path for the foam fluid, the plurality of core visualization units (201) are used to display the flow of the foam fluid in the core tube assembly (200), and the plurality of visualization devices (2021) are used to display the flow of the foam fluid in the porous media region (20211).

2. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 1, characterized in that, Each of the core visualization sections (201) is provided with a first window (2011), and multiple first windows (2011) are used to display the flow of the foam fluid in the core tube assembly (200).

3. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 1, characterized in that, Also includes: Data acquisition system (500); The core tube assembly (200) is also equipped with multiple monitoring and sampling modules (203), all of which are connected to the pipeline of the core tube assembly (200) and are communicatively connected to the data acquisition system (500). Each of the monitoring and sampling modules (203) includes a temperature sensor (2031), a pressure sensor (2032), and a sampling valve (2033). The temperature sensor (2031), the pressure sensor (2032), and the sampling valve (2033) are all connected to the core tube assembly (200) pipeline. The temperature sensor (2031) is used to detect the temperature of the foam fluid, the pressure sensor (2032) is used to detect the pressure of the foam fluid, and the sampling valve (2033) is used to sample the foam fluid.

4. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 3, characterized in that, Also includes: Multiple cameras (600); The plurality of cameras (600) are all communicatively connected to the data acquisition system (500). The plurality of cameras (600) are used to monitor the flow of the foam fluid in the porous medium region (20211) through the plurality of visualization devices (2021). The pore structure of the porous medium region (20211) is consistent with the pore structure in the core tube assembly (200).

5. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 4, characterized in that, Each of the aforementioned micro-visualization modules (202) includes: a second window (2022), a cover plate (2023), a confining pressure fluid injection tube (2024), the aforementioned visualization device (2021), and a plurality of connecting tubes (2025); The first bolt (204) is fixedly connected to the core tube assembly (200) through the second viewing window (2022), and the second viewing window (2022) is provided with an observation port (20221). A first groove is provided between the second viewing window (2022) and the core tube assembly (200). In the first groove, a second bolt (205) is fixedly connected to the core tube assembly (200) through the cover plate (2023). The cover plate (2023) is provided with a light-transmitting port (20231). The multiple cameras (600) are used to monitor the flow of the foam fluid in the porous medium region (20211) through the observation port (20221) and the light-transmitting port (20231). A second groove is provided between the cover plate (2023) and the core tube assembly (200), and the visualization device (2021) is fixedly connected to the cover plate (2023) and the core tube assembly (200) respectively in the second groove; The plurality of connecting pipes (2025) are fixedly connected to the visualization device (2021) and the core tube assembly (200) respectively. The plurality of connecting pipes (2025) are used to transmit the foam fluid in the core tube assembly (200) to the visualization device (2021) and to transmit the foam fluid in the visualization device (2021) back to the core tube assembly (200). The width of the plurality of connecting pipes (2025) is a preset width value, which is used to keep the foam flow rate in the visualization device (2021) consistent with the foam flow rate in the core tube assembly (200). The second window (2022) is provided with a third groove on the side connected to the core tube assembly (200), the cover plate (2023) is provided with the side connected to the core tube assembly (200), and the core tube assembly (200) is provided with the side connected to the visualization device (2021). Each of the plurality of third grooves is provided with a sealing gasket.

6. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 5, characterized in that, The visualization device (2021) includes a model carrier (20212) and a model cover plate (20213). The model cover plate (20213) is fixedly connected to the cover plate (2023), the model carrier plate (20212) and the core tube assembly (200) respectively, and the model carrier plate (20212) is fixedly connected to the core tube assembly (200); The porous medium region (20211) is provided on one side of the model carrier (20212) which is fixedly connected to the model cover (20213). The plurality of connecting tubes (2025) are fixedly connected to the porous medium region (20211) through the connecting holes (202121) on the model carrier (20212).

7. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 6, characterized in that, A confining pressure cavity (2026) is provided between the second viewing window (2022) and the cover plate (2023). The confining pressure liquid injection pipe (2024) is fixedly connected to the second viewing window (2022). The confining pressure liquid injection pipe (2024) is connected to the confining pressure cavity (2026), the confining pressure system (400), and the confining pressure valve (401) respectively. The confining pressure valve (401) is connected to the confining pressure system (400) and the confining pressure system (400) is used to maintain the pressure balance on both sides of the model cover plate (20213).

8. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 1, characterized in that, The core tube assembly (200) includes multiple core tubes, and each core tube is provided with multiple tube fixing sleeves (206). The support base (300) is fixedly connected to multiple bottom core tube fixing sleeves (206) on the bottom core tube. The bottom core tube refers to the bottom core tube in the multi-layer core tube, and the multiple bottom core tube fixing sleeves (206) refer to the fixing sleeves on the bottom core tube. The plurality of pipe fixing sleeves (206) on two adjacent core pipe layers are fixedly connected by a pipe support frame (207); Each core tube in the layer is composed of multiple core tubes fixedly connected by multiple flanges (208).

9. The long-duration, long-distance macro-micro coupling displacement device for foam fluid according to claim 1, characterized in that, Also includes: Produced fluid treatment system (700); The produced fluid treatment system (700) is connected to the produced valve (701) via pipeline, and the produced valve (701) is connected to the core tube assembly (200) via pipeline; The injection system (100) is connected to the inlet valve (101) via pipeline, and the inlet valve (101) is connected to the core tube assembly (200) via pipeline.

10. A long-duration, long-distance macro-micro coupled displacement system for foam fluids, characterized in that, include: A computer (800), and a foam fluid long-duration long-distance macro-micro coupling displacement device as described in any one of claims 1 to 9, which is communicatively connected to the computer (800), wherein the computer (800) is used to store flow parameters of the foam fluid.

Images