A device and method for quantitatively identifying a residual oil distribution characteristic

Abstract

This invention relates to the field of experimental equipment technology, specifically to a device and method for quantitatively identifying the distribution characteristics of residual oil. The device includes a reaction chamber, a microfluidic mechanism, an environmental control system, and an identification system. The microfluidic mechanism is disposed within the reaction chamber to simulate the structure of a real oil reservoir. The environmental control system is located at the reaction chamber to control the temperature and pressure of the microfluidic mechanism. The identification system is located at the reaction chamber to identify the type and content of residual oil within the microfluidic mechanism. This invention uses a microfluidic glass mechanism to simulate the pore structure of the formation, combined with an integrated experimental device design, to achieve quantitative and dynamic identification of the distribution characteristics of residual oil. It is simple to operate, highly efficient, and widely applicable.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and specifically to a device and method for quantitatively identifying the distribution characteristics of residual oil. Background Technology

[0002] Against the backdrop of continuously rising global energy demand and tight domestic oil resources, my country's petroleum industry has entered a development stage characterized by high water cut and high recovery rates. Most old oilfields have water cuts exceeding 80%, while recovery rates remain at a low to medium level of 35%-45%. Large amounts of residual oil remain in the reservoir's microscopic pore throats in the form of films, corners, and clusters, becoming a core potential resource for stable and increased oil production. The distribution pattern of residual oil is influenced by multiple factors, including reservoir heterogeneity, pore structure complexity, displacing fluid properties, and development methods. It exhibits strong concealment and complexity at the microscopic scale, making it difficult for traditional macroscopic monitoring methods to capture its existence and flow characteristics. Therefore, microscopic visualization technology is needed to identify and characterize residual oil, providing a scientific basis for its development.

[0003] The application of microscopic visualization technology in residual oil research represents a significant technological evolution in petroleum development, moving from macroscopic description to microscopic mechanism exploration. In the mid-20th century, static microscopic characterization techniques such as thin-section observation and cast thin-section analysis were gradually applied, providing a scientific basis for understanding reservoir pore structure and residual oil morphology. However, these techniques could not capture the dynamic changes in residual oil during displacement. With technological advancements, dynamic visualization techniques such as microscopic displacement experiments, nuclear magnetic resonance imaging (NMR), and X-ray computed tomography (CT) have enabled a shift from static to dynamic approaches. Furthermore, with the development of science and technology, the integration with image recognition and processing has further developed microscopic visualization analysis systems, enabling real-time observation of fluid flow paths in pores, residual oil formation, and retention morphology. This allows residual oil identification to move from qualitative description to quantitative characterization, providing technical support for revealing the microscopic mechanisms of reservoir development.

[0004] However, existing microscopic visualization analysis systems require operators to have professional knowledge and manually classify data, which is inefficient and has various problems such as limited applicability. Summary of the Invention

[0005] In view of this, the present invention provides a device and method for quantitative identification of residual oil distribution characteristics. By using a microfluidic glass mechanism to simulate the pore structure in the formation and in conjunction with the design of an integrated experimental device, the device achieves quantitative identification and dynamic identification of residual oil distribution characteristics. It is simple to operate, highly efficient, and has strong applicability.

[0006] In a first aspect, the present invention provides a device for quantitatively identifying the distribution characteristics of residual oil, comprising a reaction chamber, a microfluidic mechanism, an environmental control system, and an identification system. The microfluidic mechanism is disposed inside the reaction chamber to simulate the structure of a real reservoir. The environmental control system is disposed at the reaction chamber to control the temperature and pressure of the microfluidic mechanism. The identification system is disposed at the reaction chamber to identify the type and content of residual oil in the microfluidic mechanism.

[0007] Furthermore, the microfluidic mechanism includes a microfluidic glass model and an electric guide stage. The microfluidic glass model is installed inside the reaction chamber, and the electric guide stage is partially installed inside the reaction chamber and in contact with the microfluidic glass model, used to control the movement of the microfluidic glass model inside the reaction chamber.

[0008] Based on the aforementioned technical means, the electric guide stage and the microfluidic glass model work together to adjust the position of the microfluidic glass model, which is beneficial for photographing the distribution characteristics of residual oil within the microfluidic glass model.

[0009] Furthermore, the microfluidic glass model includes a glass sheet on which a porous structure is etched.

[0010] Based on the above-mentioned technical means, the structure of the real reservoir can be simulated by etching the pore structure.

[0011] Furthermore, the electric guide table includes a support frame, a hollow platform, and a sliding rod. The support frame is installed inside the reaction chamber, the hollow platform is slidably installed on the support frame, the microfluidic glass model is installed on the hollow platform, one end of the sliding rod is connected to the hollow platform, and the other end extends out of the reaction chamber.

[0012] Based on the above-mentioned technical means, the position of the microfluidic glass model can be controlled by setting up an electric guide stage, which is beneficial for taking pictures of the distribution characteristics of the remaining oil in the microfluidic glass model.

[0013] Furthermore, the environmental control system includes a temperature control system and a pressure control system, wherein the temperature control system is used to control the temperature within the microfluidic mechanism, and the pressure control system is used to control the pressure within the microfluidic mechanism.

[0014] Based on the above-mentioned technical means, it is possible to simulate the environment in which crude oil exists.

[0015] Furthermore, the temperature control system includes a pump body, a container, and a thermostat. One end of the container is connected to the pump body, and the other end is connected to the microfluidic mechanism for delivering liquid in the container to the microfluidic mechanism. The thermostat is connected to the microfluidic mechanism for maintaining the temperature of the microfluidic mechanism.

[0016] According to the above-mentioned technical means, crude oil and reagents can be added to the microfluidic mechanism through the pump body and container, while the thermostatic component can maintain the temperature of the microfluidic mechanism.

[0017] Furthermore, the pressure control system includes a pressure component and a sensor. One end of the pressure component is connected to a microfluidic mechanism for delivering pressure, and the sensor is mounted on the microfluidic mechanism for real-time pressure monitoring.

[0018] Based on the above-mentioned technical means, the pressure of the microfluidic mechanism can be controlled through the pressure control system.

[0019] Furthermore, the identification system includes an illumination component, a microscope, a camera, and a computer. The illumination component is located outside the reaction chamber, the microscope is located on the reaction chamber, the camera is connected to the port of the microscope, and the computer is electrically connected to the camera.

[0020] Based on the aforementioned technical means, the dynamic residual oil distribution characteristics of tight oil can be quantitatively identified through the cooperation of lighting components, microscopes, cameras, and computers.

[0021] Furthermore, the reaction chamber includes a first chamber, a second chamber, and a third chamber, the first chamber and the third chamber being connected, and the second chamber being used to install a microfluidic mechanism.

[0022] Based on the above technical means, dividing the reaction chamber into sections facilitates the installation and setup of other components.

[0023] This application also discloses a method for quantitatively identifying the distribution characteristics of residual oil, including the following steps: The environmental control system is activated to control the temperature and pressure within the microfluidic mechanism. Then, formation crude oil is injected into the microfluidic mechanism, and its saturation status is observed using a microscope. After saturating the formation with crude oil, reagents are injected, and simultaneously, a camera is turned on, the microscope magnification is adjusted, and photos are taken. The photos are then transmitted to a computer for automatic analysis and identification of the type and content of remaining oil.

[0024] The present invention, employing the above-described solution, has at least the following beneficial effects: In this application, a microfluidic glass model is used to simulate the pore structure in the formation. The model is placed in a reaction chamber, and a reagent is injected into the microfluidic glass model. The confining pressure and temperature of the microfluidic glass model are controlled by an environmental control system. The remaining oil and fluid flow state in the microfluidic glass model are observed by an identification system, which realizes the quantitative and dynamic identification of the distribution characteristics of the remaining oil. The operation is simple, efficient, and highly applicable. Attached Figure Description

[0025] This application can be further illustrated by the non-limiting embodiments given in the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the structure of the residual oil distribution characteristic quantitative identification device in the embodiments of this application; Figure 2 This is one of the structural schematic diagrams of the electric guide platform and the reaction chamber in the embodiments of this application; Figure 3 This is the second schematic diagram of the structure of the electric guide platform and the reaction chamber in the embodiments of this application; Figure 4 These are partial photographs taken by the camera in the embodiments of this application; Figure 5 This is an image formed by integrating partial photographs from the embodiments of this application; Figure 6 This is a partial image of a microfluidic glass model under a microscope in an embodiment of this application; Figure 7 This is a diagram showing the type and content of residual oil identified in the embodiments of this application; Figure 8 This is a graph showing the type and content of residual oil identified in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Pump body; 2. Thermostat; 3. Pressure component; 4. Computer; 5. Camera; 6. Microscope; 7. Lighting system; 8. Reaction chamber; 81. First chamber; 82. Second chamber; 83. Third chamber; 9. Electric guide platform; 10. Microfluidic glass model; 11. Channel; 12. Pressure relief valve; 13. Waste liquid tank; 14. Container; 15. Support frame; 16. Hollowed-out platform; 17. Sliding rod; 18. Fixture; 19. Bolt; 20. Roller. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product size; it is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0028] In the figures of this invention, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. In the description of this application, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] Firstly, such as Figure 1-3 As shown in the illustration, this application proposes a device for quantitatively identifying the distribution characteristics of residual oil, including a reaction chamber 8, a microfluidic mechanism, an environmental control system, and an identification system. The microfluidic mechanism is housed within the reaction chamber 8 to simulate the structure of a real oil reservoir. The environmental control system is located within the reaction chamber 8 to control the temperature and pressure of the microfluidic mechanism. The identification system is located within the reaction chamber 8 to identify the type and content of residual oil within the microfluidic mechanism. By using a microfluidic glass mechanism to simulate the pore structure of the formation, and in conjunction with the design of an integrated experimental device, the device achieves quantitative and dynamic identification of the distribution characteristics of residual oil. It is simple to operate, highly efficient, and widely applicable.

[0031] In some embodiments, such as Figure 1 As shown, the reaction chamber 8 includes a first chamber 81, a second chamber 82, and a third chamber 83. The first chamber 81 is located at the top of the reaction chamber 8, the second chamber 82 is located in the middle of the reaction chamber 8, and the third chamber 83 is located at the bottom of the reaction chamber 8. A channel 11 is provided between the first chamber 81 and the third chamber 83 to allow communication between them. The second chamber 82 is used to mount a microfluidic mechanism.

[0032] In this embodiment, the top and bottom of the reaction chamber 8 are made of glass, while the sides are made of alloy materials, such as Hastelloy, Inconel, Monel, and titanium alloys. Alternatively, a suitable alloy material can be selected based on the specific circumstances. The combination of alloy and glass ensures that the reaction chamber 8 appears transparent when viewed from above or below, and it can withstand high temperatures and pressures.

[0033] In some embodiments, the environmental control system includes a temperature control system and a pressure control system. The temperature control system is used to control the temperature within the microfluidic mechanism. The pressure control system is used to control the pressure within the microfluidic mechanism.

[0034] In one specific embodiment, such as Figure 1 As shown, the temperature control system includes a pump body 1, a container 14, and a thermostat 2. One end of the container 14 is connected to the pump body 1, and the other end is connected to the microfluidic mechanism, used to deliver the liquid in the container 14 to the microfluidic mechanism. The thermostat 2 is connected to the microfluidic mechanism and used to maintain the temperature of the microfluidic mechanism.

[0035] In this embodiment, the pump body 1 can be configured as one of a constant pressure and constant speed displacement pump, a high pressure constant speed and constant pressure pump, a constant pressure pump, a precision injection pump, or an electroosmotic pump. A suitable pump body 1 can also be selected based on actual conditions. In this embodiment, a constant pressure and constant speed displacement pump is preferred, as it can precisely control the pressure and flow rate of the fluid.

[0036] In some embodiments, multiple containers 14 are provided, each used to hold saturated formation water, formation crude oil, and injected reagents. The inlets of the multiple containers 14 are connected in parallel with constant pressure and constant speed displacement pumps to drive the movement of the liquid contained in each container 14. The outlets of the multiple containers 14 are connected in parallel and then connected to a microfluidic mechanism, allowing the liquid in each container 14 to enter the microfluidic mechanism separately.

[0037] Understandably, both the inlet and outlet of container 14 have switches for controlling the opening and closing of container 14. These switches can be manual or electric. For example, manual switches can be rotary switches, toggle switches, etc., and appropriate manual switches can be selected according to actual needs; electric switches can be electric ball valves, electric butterfly valves, solenoid valves, etc., and appropriate electric switches can be selected according to actual needs. During use, the switches of the relevant containers 14 into which liquid needs to be injected into the microfluidic mechanism are opened, while the switches of other containers 14 are closed when not in use, to ensure accurate liquid injection.

[0038] In some embodiments, the thermostat 2 includes a water bath heating tank, pipes, and a circulation pump. The water bath heating tank is installed on one side of the microfluidic mechanism. The pipes connect to the first chamber 81 of the reaction chamber 8 and then back to the water bath heating tank from the third chamber 83. The circulation pump is connected to the pipes, allowing water in the water bath heating tank to be heated to a suitable temperature before entering the first chamber 81 of the reaction chamber 8 through the pipes, and then entering the third chamber 83. During this process, the second chamber 82 is heated. After entering the third chamber 83, the water flows back to the water bath heating tank, achieving circulating heating to maintain the temperature of the second chamber 82.

[0039] Understandably, temperature sensors are installed on the pipes, and the water bath heating box is equipped with a control panel that can control the water heating temperature.

[0040] In some embodiments, such as Figure 1-3 As shown, the microfluidic mechanism includes a microfluidic glass model 10 and an electric guide 9. The microfluidic glass model 10 is installed in the second chamber 82 of the reaction chamber 8. The electric guide 9 is partially installed in the second chamber 82 of the reaction chamber 8 and contacts the microfluidic glass model 10, and is used to control the movement of the microfluidic glass model 10 within the second chamber 82 of the reaction chamber 8.

[0041] In one specific embodiment, the microfluidic glass model 10 includes a glass sheet. A porous structure is etched onto the glass sheet to simulate the structure of a real oil reservoir and to allow for observation.

[0042] In this embodiment, the outlet of container 14 is connected to the inlet of microfluidic glass model 10 via a liquid infusion tube, allowing the liquid in container 14 to enter the porous structure. To remove the liquid entering the microfluidic glass model 10, the outlet of the microfluidic glass model 10 is connected to a waste liquid tank 13 via a drain pipe.

[0043] Understandably, a border is placed around the glass slide to facilitate assembly. During the glass slide processing, a portion of the target block's core is first cut using a cutting machine. Then, the core pore structure is obtained using a casting method. The pore structure on the core slide is drawn using software, and an etching technique is used to etch the pore structure onto the quartz glass slide, resulting in the microfluidic glass model 10. Both the inlet and outlet of the microfluidic glass model 10 penetrate the border.

[0044] In one embodiment of the present invention, such as Figure 2-3As shown, the electric guide table 9 includes a support frame 15, a perforated platform 16, and a sliding rod 17. The support frame 15 is installed inside the second chamber 82 of the reaction chamber 8. The perforated platform 16 is slidably mounted on the support frame 15, and the microfluidic glass model 10 is mounted on the perforated platform 16, allowing the microfluidic glass model 10 to move within the second chamber 82. One end of the sliding rod 17 is connected to the perforated platform 16, and the other end extends out of the reaction chamber 8, used to control the movement position of the microfluidic glass model 10.

[0045] In one specific embodiment, both the support frame 15 and the hollow platform 16 are made of Hastelloy alloy. The support frame 15 is fixedly connected to the metal material around the reaction chamber 8 by bolts 19. A slide rail is installed on the upper edge of the support frame 15, and rollers 20 are installed between the hollow platform 16 and the slide rail to make the sliding smoother. One end of the sliding rod 17 is fixedly connected to the edge of the hollow platform 16, and the free end of the sliding rod 17 protrudes through the corresponding side, so that the movement of the hollow platform 16 can be controlled outside the reaction chamber 8.

[0046] Understandably, sliding rods 17 can extend from all four sides of the reaction chamber 8, or they can extend from both the transverse and longitudinal sides relative to the hollow platform 16. To improve the sealing of the second chamber 82, the connection between the sliding rod 17 and the reaction chamber 8 is a sliding seal connection.

[0047] In some embodiments, the operation can be manual or motor-driven. In manual operation, the position of the cutout platform 16 and the microfluidic glass model 10 is adjusted by pulling the sliding rod 17. In motor-driven operation, one end of the sliding rod 17 is connected to the output end of the electric telescopic rod to adjust the position of the cutout platform 16 and the microfluidic glass model 10.

[0048] In this embodiment, in order to detachably and fix the microfluidic glass model 10 to the hollow platform 16, the frame of the microfluidic glass model 10 and the hollow platform 16 are detachably connected by four L-shaped fasteners 18 and bolts 19.

[0049] In some embodiments, the pressure control system includes a pressure element 3 and a sensor. One end of the pressure element 3 is connected to a second chamber 82 for delivering pressure, and the sensor is disposed in the second chamber 82 for real-time pressure monitoring.

[0050] Understandably, pressure component 3 can be configured to work with gas cylinders, booster pumps, and pressure reducing valves to achieve pressurization. Alternatively, appropriate pressure delivery equipment can be selected based on actual conditions. Pressure component 3 delivers compressed air to the second chamber 82 via a gas delivery pipe, placing the microfluidic glass model 10 in a high-pressure environment with a fixed pressure, which helps simulate the actual environment. To restore the pressure in the second chamber 82, a pressure relief valve 12 is installed on the gas delivery pipe of pressure component 3.

[0051] In some embodiments, such as Figure 1 As shown, the identification system includes an illumination assembly, a microscope 6, a camera 5, and a computer 4. The illumination assembly is located at the bottom of the reaction chamber 8 to provide illumination for the microfluidic glass model 10. The microscope 6 is located above the reaction chamber 8, the camera 5 is connected to the port of the microscope 6, and the computer 4 is electrically connected to the camera 5. Through the cooperation of the illumination assembly, microscope 6, camera 5, and computer 4, the distribution characteristics of residual oil can be quantitatively identified and dynamically identified.

[0052] In one embodiment of the present invention, the lighting component can be configured as an LED spotlight, a focused spotlight, a telecentric Köhler lighting system 7, etc., and appropriate luminaires can be selected according to actual conditions. By configuring the lighting component, the main light source is focused on the porous structure of the glass slide, making it easier to observe.

[0053] Because the photographs of the entire glass model taken using the stereomicroscope 6 during the experiment were unclear, making it impossible to clearly observe the content and type of remaining oil, a combination of the microscope 6 and the camera 5 was used to capture clear photographs, which were then identified by the computer 4 to determine the content and type of remaining oil. In this embodiment, the camera 5 is configured as a high-speed camera.

[0054] Understandably, the high-speed camera uses the center of the lens of microscope 6 as the coordinate system point. The computer software establishes a complete coordinate system in both horizontal and vertical directions, with the horizontal direction as the X-axis and the vertical direction as the Y-axis. The center of microscope 6 is aligned with the center of the hollow platform 16. The high-speed camera 5 uses this center as the midpoint and divides the glass model into equal parts according to its side length. While camera 5 is working, it takes pictures in seconds, sequentially from left to right. The computer software automatically combines these partial photos into a complete image, ensuring image clarity and integrity. Figure 4-5 As shown.

[0055] Computer processing software is used to identify the type and content of residual oil. The input image first undergoes multiple 2×2 convolutions to extract initial features. Then, pooling is performed on the convolutional image to progressively reduce the feature map size and extract high-level semantic features. Simultaneously, feature maps from each layer in the encoding stage are directly passed to the corresponding layers in the Unet model's decoding stage via skip connections. In the decoding stage, the feature map size is first enlarged through upsampling. The upsampled feature map is then fused with the feature map passed from the skip connections, and further integrated through 2×2 or 1×1 convolutions to finally generate a segmentation result matching the size of the input image. This software significantly reduces the processing time for experimental analysis, enabling morphological classification and quantitative analysis of residual oil in a short time. The introduction of this auxiliary software greatly improves the efficiency of result analysis while ensuring high accuracy.

[0056] Understandably, pooling reduces the dimensionality of the convolutional image by downsampling while retaining key information. After pooling, the convolutional neural network gradually abstracts the convolutional image from low-level features to high-level features to extract high-level semantic features, enabling the recognition of the meaning expressed in the image.

[0057] Understandably, computer processing software can use the U-Net model, which is a convolutional neural network used for image segmentation tasks and can generate accurate pixel-level segmentation results.

[0058] This invention also provides a method for quantitatively identifying the distribution characteristics of residual oil, comprising the following steps: The environmental control system was activated to control the temperature and pressure inside the microfluidic mechanism. Then, formation crude oil was injected into the microfluidic mechanism, and its saturation status was observed using a microscope. After saturating the formation with crude oil, reagents are injected, and simultaneously, camera 5 is turned on, microscope 6 is magnified and photographs are taken. The photographs are then transmitted to computer 4 for automatic analysis and identification of the type and content of remaining oil.

[0059] The above method can simulate the identification and characterization of residual oil in tight crude oil formations, and it is simple to operate, highly efficient, and widely applicable.

[0060] In one embodiment of the present invention, the method includes the following specific steps: The injection rate of the liquid in container 14, the set temperature of the water in the thermostat 2, and the injection pressure of the pressure control system are set according to the test requirements. Fix the microfluidic glass model 10 on the hollow platform 16, and adjust the center position of the microfluidic glass model 10 to coincide with the center of the hollow platform 16; Turn on the lighting system 7, microscope 6, camera 5 and computer 4, align the dot of microscope 6 with the center of microfluidic glass model 10, so that microscope 6 is directly above microfluidic glass model 10, and the light source through microfluidic glass model 10 is just reflected onto microscope 6.

[0061] The thermostat 2 is activated to set the temperature, and hot water is supplied to the reaction chamber 8 for real-time circulation to ensure a high-temperature environment during the experiment. This is understandable, as the experimental temperature is set according to different formation temperatures.

[0062] The pressure control system is activated to set the pressure, injecting pressure into the second chamber 82 of the reaction chamber 8. After injection, the valve is closed to maintain a constant pressure in the external environment of the microfluidic glass model 10. Understandably, the experimental pressure is set according to different formation pressures.

[0063] Pump 1 is started to inject formation crude oil into microfluidic glass model 10, and its saturation status is observed using microscope 6.

[0064] Restart pump 1. After saturating the formation crude oil, inject the reagent according to the set injection rate and volume. At the same time, turn on the software in microscope 6, camera 5 and computer 4, adjust the magnification of microscope 6 according to the required accuracy of the experiment, and film the flow of injected reagent and the displacement of formation crude oil.

[0065] Once the required dosage of the injected medication has been reached, the injection process is stopped.

[0066] After the experiment, open the pressure relief valve 12 to release the pressure; turn off the temperature control system and drain the water from the reaction chamber 8; turn off the pump body 1 and take out the microfluidic glass model 10 for cleaning; after identifying the remaining oil in the photos taken by the camera 5, turn off the computer 4 and the microscope 6.

[0067] In one embodiment of the present invention, the number of partial photos captured by camera 5 is... N The formula is as follows: Where N is the number of partial photographs (photos); K is the microscope magnification; T is the shooting time (s); and V is the shooting speed (photos / s).

[0068] In one embodiment, such as Figure 6-8As shown, the photos taken by camera 5 are saved and imported in batches into the residual oil identification software in computer 4 for automatic analysis and identification of the type and content of residual oil. The software will output an image and graph that uses multiple colors to distinguish the type of residual oil, and at the same time mark its content in the software, so as to realize the quantitative identification and dynamic identification of the characteristics of residual oil.

[0069] The foregoing provides a detailed description of a device and method for quantitatively identifying the distribution characteristics of residual oil provided in this application. The specific embodiments are described only to aid in understanding the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this invention.

[0070] It should be noted that the terms "one embodiment," "embodiment," "some alternative embodiments," "exemplary embodiments," and "some embodiments" used in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0071] Finally, it should be noted that 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. Such 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 device for quantitatively identifying the distribution characteristics of residual oil, characterized in that, It includes a reaction chamber (8), a microfluidic mechanism, an environmental control system, and an identification system. The microfluidic mechanism is set inside the reaction chamber (8) to simulate the structure of the real reservoir. The environmental control system is set at the reaction chamber (8) to control the temperature and pressure of the microfluidic mechanism. The identification system is set at the reaction chamber (8) to identify the type and content of residual oil in the microfluidic mechanism.

2. The residual oil distribution characteristic quantitative identification device according to claim 1, characterized in that, The microfluidic mechanism includes a microfluidic glass model (10) and an electric guide (9). The microfluidic glass model (10) is installed inside the reaction chamber (8). The electric guide (9) is partially installed inside the reaction chamber (8) and contacts the microfluidic glass model (10) to control the movement of the microfluidic glass model (10) inside the reaction chamber (8).

3. The quantitative identification device for residual oil distribution characteristics according to claim 2, characterized in that, The microfluidic glass model (10) includes a glass sheet on which a porous structure is etched.

4. The quantitative identification device for residual oil distribution characteristics according to claim 2 or 3, characterized in that, The electric guide platform (9) includes a support frame (15), a hollow platform (16) and a sliding rod (17). The support frame (15) is installed inside the reaction chamber (8). The hollow platform (16) is slidably installed on the support frame (15). The microfluidic glass model (10) is installed on the hollow platform (16). One end of the sliding rod (17) is connected to the hollow platform (16), and the other end extends out of the reaction chamber (8).

5. The quantitative identification device for residual oil distribution characteristics according to claim 1 or 2, characterized in that, The environmental control system includes a temperature control system and a pressure control system. The temperature control system is used to control the temperature inside the microfluidic mechanism, and the pressure control system is used to control the pressure inside the microfluidic mechanism.

6. The quantitative identification device for residual oil distribution characteristics according to claim 5, characterized in that, The temperature control system includes a pump body (1), a container (14), and a thermostat (2). One end of the container (14) is connected to the pump body (1), and the other end is connected to the microfluidic mechanism. The container (14) is used to transport the liquid in the container (14) to the microfluidic mechanism. The thermostat (2) is connected to the microfluidic mechanism and is used to maintain the temperature of the microfluidic mechanism.

7. The quantitative identification device for residual oil distribution characteristics according to claim 5, characterized in that, The pressure control system includes a pressure component (3) and a sensor. One end of the pressure component (3) is connected to the microfluidic mechanism for delivering pressure. The sensor is mounted on the microfluidic mechanism for real-time pressure monitoring.

8. The quantitative identification device for residual oil distribution characteristics according to claim 1 or 2, characterized in that, The identification system includes an illumination component, a microscope (6), a camera (5), and a computer (4). The illumination component is located outside the reaction chamber (8), the microscope (6) is located on the reaction chamber (8), the camera (5) is connected to the port of the microscope (6), and the computer (4) is electrically connected to the camera (5).

9. The quantitative identification device for residual oil distribution characteristics according to claim 1, characterized in that, The reaction chamber (8) includes a first chamber (81), a second chamber (82) and a third chamber (83), the first chamber (81) and the third chamber (83) are connected, and the second chamber (82) is used to install a microfluidic mechanism.

10. A method for quantitatively identifying the distribution characteristics of residual oil as described in any one of claims 1-9, characterized in that, Includes the following steps: Start the environmental control system to control the temperature and pressure inside the microfluidic mechanism, then inject formation crude oil into the microfluidic mechanism and observe its saturation status using a microscope (6); After saturating the formation with crude oil, a reagent is injected, and at the same time, the camera (5) is turned on, the magnification of the microscope (6) is adjusted, and a photo is taken. The photo is then transmitted to the computer (4) for automatic analysis and identification of the type and content of the remaining oil.

Images