A high-precision heavy non-aqueous phase liquid migration test drainage device capable of eliminating phase stagnation
By designing a multiphase flow guiding device with a downwardly concave funnel-shaped flow guiding surface and a communicating vessel structure, and combining it with a hydraulic sensor and an electronic balance, the problems of heavy non-aqueous liquid retention and inaccurate flow measurement in the flat-bottomed test chamber were solved, and high-precision multiphase fluid flow monitoring was achieved.
Patent Information
- Application Number
- CN202610662381.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-14
- Publication Date
- 2026-07-31
AI Technical Summary
In the existing technology, when the flat-bottomed test chamber drains liquid, it is easy to create a dead zone for drainage, which causes the heavy non-aqueous phase liquid to stagnate at the bottom edge, forming phase stagnation. At the same time, traditional measurement methods are difficult to accurately distinguish the instantaneous flow rates of the aqueous phase and the heavy non-aqueous phase liquid in multiphase fluids.
By employing a downward-concave funnel-shaped variable-slope guide surface and a communicating vessel structure, combined with hydraulic sensors and electronic balances, a multiphase flow guiding device and a flow phase separation monitoring device are designed to ensure that multiphase fluids are collected and discharged without dead zones, and to achieve independent, continuous, and dynamic monitoring of heavy non-aqueous liquids and aqueous phases.
It effectively eliminates the phase retention problem, significantly improves the measurement accuracy of multiphase fluid phase flow, and provides reliable experimental data support.
Smart Images
Figure CN122486731A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of hydrogeological experimental technology, and in particular relates to a high-precision drainage device for testing the migration of heavy non-aqueous phase liquids to eliminate phase retention. Background Technology
[0002] In hydrogeological multiphase flow simulation experiments, especially when testing the migration patterns of heavy non-aqueous liquids, the drainage efficiency at the bottom of the test chamber and the accuracy of phase separation measurement of the multiphase fluid directly affect the reliability of the experimental data. Currently, most commonly used test chambers have a flat-bottom structure, and the multiphase fluid is discharged through a bottom drain port. For phase separation measurement of multiphase fluids, manual reading of the liquid level or estimation of the total volume using a single sensor is often employed.
[0003] However, current methods are prone to creating dead zones during drainage in flat-bottomed test chambers, leading to the retention of heavy non-aqueous liquids at the bottom edge, forming a "phase stagnation" problem. Traditional single measurement methods struggle to accurately distinguish the instantaneous flow rates of the aqueous phase and heavy non-aqueous liquids in the discharged multiphase fluid. Summary of the Invention
[0004] This application provides a high-precision heavy non-aqueous phase liquid migration test drainage device that eliminates phase retention. It can solve the problems of the current method, which easily generates drainage dead angles when draining liquid from the flat-bottomed test chamber, causing heavy non-aqueous phase liquid to stagnate at the bottom edge and form "phase retention", and the difficulty of the traditional single measurement method in accurately distinguishing the instantaneous flow rates of the aqueous phase and heavy non-aqueous phase liquid in the discharged multiphase fluid.
[0005] In a first aspect, embodiments of this application provide a high-precision heavy non-aqueous phase liquid migration test drainage device for eliminating phase retention, comprising a multiphase flow guiding device and a multiphase flow separation monitoring device; the multiphase flow guiding device is horizontally mounted at the bottom of the test chamber of the heavy non-aqueous phase liquid migration test device, and includes a drain port, a variable slope guiding surface, and a guiding base; the multiphase flow separation monitoring device includes a multiphase separation tank, a heavy non-aqueous phase liquid measuring tank, and an aqueous phase measuring device; the multiphase separation tank includes a first valve, a second valve, and a water outlet, the first valve and the second valve being disposed opposite each other at the bottom of the multiphase separation tank, and the water outlet being disposed at the upper part of the multiphase separation tank and higher than the first valve; the heavy non-aqueous phase liquid measuring tank includes a third valve; the multiphase flow guiding device and the multiphase flow separation monitoring device are connected by a pipe connecting the drain port and the first valve; the multiphase separation tank and the heavy non-aqueous phase liquid measuring tank are connected by a communicating vessel connecting the second valve and the third valve; the aqueous phase measuring device is disposed directly below the water outlet.
[0006] In one possible implementation of the first aspect, the aforementioned drain outlet is installed through the guide chassis as the only channel for the discharge of multiphase fluid; the variable slope guide surface forms the top surface of the multiphase guide device, which is a smooth curved surface in the shape of a downwardly concave funnel, and the variable slope guide surface continuously slopes downward and converges with the location of the drain outlet as the center of convergence, so that the drain outlet is located at the lowest elevation of the variable slope guide surface.
[0007] Optionally, in another possible implementation of the first aspect, the first cross-section of the multiphase flow guiding device on the first horizontal plane is located within the second cross-section of the test chamber of the heavy non-aqueous phase liquid migration test device on the first horizontal plane; the distance between any point on the edge of the first cross-section and the nearest point on the edge of the second cross-section is 1 mm to 2 mm; the gap between the multiphase flow guiding device and the test chamber of the heavy non-aqueous phase liquid migration test device is filled with a sealing medium, which is sludge or petroleum jelly.
[0008] Optionally, in another possible implementation of the first aspect, the aforementioned multiphase flow guiding device is made of corrosion-resistant polytetrafluoroethylene or stainless steel to resist chemical erosion by the heavy non-aqueous phase liquid in the multiphase fluid.
[0009] Optionally, in another possible implementation of the first aspect, the two sidewalls of the above-mentioned drain outlet extend upward to form anti-overflow protrusions, which are provided along the edge contour of the drain outlet.
[0010] Optionally, in another possible implementation of the first aspect, the aforementioned heavy non-aqueous liquid measuring tank is further provided with a fourth valve for connecting a hydraulic sensor and a fifth valve for discharging liquid; the hydraulic sensor is communicatively connected to the data acquisition module.
[0011] Optionally, in another possible implementation of the first aspect, the above-mentioned aqueous phase measuring device includes an electronic balance and a beaker disposed on the electronic balance, the beaker being disposed below the water outlet; the electronic balance is communicatively connected to the data acquisition module.
[0012] Optionally, in another possible implementation of the first aspect, the static pressure of the bottom liquid column in the multiphase separation tank and the heavy non-aqueous phase liquid measuring tank satisfies the following pressure balance relationship:
[0013]
[0014] in, This refers to the static pressure of the liquid column at the bottom of the multiphase separator. For measuring the static pressure of the liquid column at the bottom of the tank for heavy non-aqueous liquids, The density of water, The density of a heavy, non-aqueous liquid is given. The water phase height inside the multiphase separator. The height of the heavy non-aqueous phase liquid in the multiphase separator. To measure the height of the non-aqueous phase liquid in the measuring vessel, To prevent evaporation, cover the liquid level.
[0015] Secondly, this application provides a method for calibrating the flow rate of heavy non-aqueous liquid, applied to the aforementioned device, comprising: opening the second valve, the third valve, and the fourth valve, and closing the first valve and the fifth valve; adding heavy non-aqueous liquid to the multiphase separation tank to half the tank capacity, and adding aqueous phase to the multiphase separation tank until water is discharged from the outlet; adding distilled water to the heavy non-aqueous liquid measuring tank to cover the surface of the heavy non-aqueous liquid; sequentially injecting known volumes of heavy non-aqueous liquid into the heavy non-aqueous liquid measuring tank according to a preset volume gradient; after each volume gradient injection is completed, waiting for the liquid level to stabilize, synchronously recording the corresponding stable pressure value through the hydraulic sensor to obtain multiple sets of volume-pressure data pairs; based on the multiple sets of volume-pressure data pairs, performing regression analysis using the least squares method to construct a mapping function V=f(P) between the volume V of the heavy non-aqueous liquid and the pressure value P; during the actual heavy non-aqueous liquid migration test, inputting the pressure signal acquired in real time by the hydraulic sensor into the mapping function, and converting it in real time to obtain the real-time volume of the heavy non-aqueous liquid in the heavy non-aqueous liquid measuring tank.
[0016] Thirdly, this application provides a method for correcting the aqueous phase flow rate, applied to the aforementioned device, comprising: during operation, continuously collecting the total physical quantity of the aqueous phase liquid overflowing from the outlet of the multiphase separator through the aqueous phase measuring device, and converting it into the total overflow aqueous phase volume; acquiring the pressure signal of the hydraulic sensor at the same time, and converting it into the volume of the heavy non-aqueous phase liquid according to the aforementioned heavy non-aqueous phase liquid flow rate calibration method, wherein the heavy non-aqueous phase liquid volume is the amount of aqueous phase forced to overflow from the outlet due to gravity settling and displacement; and subtracting the amount of aqueous phase displacement from the total overflow aqueous phase volume at the same time to obtain the actual volume of the aqueous phase liquid flowing out through the porous medium during that time period.
[0017] Beneficial Effects: This application, by setting a downwardly concave funnel-shaped variable-slope guide surface and placing the drain outlet at its lowest elevation, ensures that the multiphase fluid is completely collected and discharged without dead zones under gravity, fundamentally eliminating the phase retention problem of heavy non-aqueous liquid at the bottom edge in traditional flat-bottomed test chambers. Simultaneously, by utilizing a communicating vessel structure consisting of a multiphase separation tank and a heavy non-aqueous liquid measurement tank, combined with hydraulic sensors and an electronic balance, independent and continuous dynamic monitoring of the heavy non-aqueous liquid and the aqueous phase is achieved, significantly improving the measurement accuracy of the phase flow rate. A volume-pressure mapping relationship is established through calibration to calculate the volume of the heavy non-aqueous liquid in real time, and the amount of aqueous phase squeezed out due to gravity settling is deducted from the total overflow volume, thereby accurately obtaining the actual aqueous phase flow rate through the porous medium, providing reliable data support for simulation experiments such as groundwater pollution remediation. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of a high-precision heavy non-aqueous phase liquid migration test drainage device for eliminating phase retention provided in an embodiment of this application;
[0020] Figure 2 This is a schematic diagram of the structure of a multiphase flow guiding device provided in an embodiment of this application;
[0021] Figure 3 This is a schematic flowchart of a method for calibrating the flow rate of a non-aqueous phase liquid according to an embodiment of this application;
[0022] Figure 4 This is a schematic flowchart of a method for correcting aqueous flow rate according to an embodiment of this application;
[0023] Explanation of reference numerals in the attached figures:
[0024] 1- Variable slope guide surface; 2- Drain outlet; 3- Guide base; 4- First valve; 5- Multiphase separator; 6- Outlet; 7- Second valve; 8- Beaker; 9- Electronic balance; 10- Third valve; 11- Heavy non-aqueous phase liquid measuring tank; 12- Fourth valve; 13- Fifth valve. Detailed Implementation
[0025] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.
[0026] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.
[0027] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0028] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."
[0029] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0031] The following is a detailed description of a high-precision heavy non-aqueous phase liquid migration test drainage device and method for eliminating phase retention, provided in this application, with reference to the accompanying drawings.
[0032] Figure 1 This illustration shows a schematic diagram of a high-precision heavy non-aqueous phase liquid migration test drainage device for eliminating phase retention, according to an embodiment of this application. Figure 2 A schematic diagram of the multiphase flow guiding device provided in the embodiments of this application is shown.
[0033] like Figure 1 and Figure 2 As shown, the high-precision heavy non-aqueous phase liquid migration test drainage device for eliminating phase retention includes: a multiphase flow guiding device and a multiphase flow separation monitoring device; the multiphase flow guiding device is horizontally mounted at the bottom of the test chamber of the heavy non-aqueous phase liquid migration test device, and includes a drain port 2, a variable slope flow guiding surface 1, and a flow guiding base 3; the multiphase flow separation monitoring device includes a multiphase separation tank 5, a heavy non-aqueous phase liquid measuring tank 11, and an aqueous phase measuring device; the multiphase separation tank 5 includes a first valve 4, a second valve 7, and a water outlet. 6. The first valve 4 and the second valve 7 are positioned opposite each other at the bottom of the multiphase separation tank 5. The outlet 6 is located at the top of the multiphase separation tank 5 and is higher than the first valve 4. The heavy non-aqueous phase liquid measuring tank 11 includes a third valve 10. The multiphase flow guiding device and the multiphase flow phase separation monitoring device are connected by a pipe connecting the drain port 2 and the first valve 4. The multiphase separation tank 5 and the heavy non-aqueous phase liquid measuring tank 11 are connected by a connector connecting the second valve 7 and the third valve 10. The aqueous phase measuring device is located directly below the outlet 6.
[0034] Furthermore, in this embodiment, the above-mentioned drain port 2 is provided through the guide chassis 3 as the only channel for the discharge of multiphase fluid; the variable slope guide surface 1 forms the top surface of the multiphase guide device, which is a smooth curved surface in the shape of a downwardly concave funnel, and the variable slope guide surface 1 continuously slopes downward with the location of the drain port 2 as the center of convergence, so that the drain port 2 is located at the lowest elevation of the variable slope guide surface 1.
[0035] Furthermore, in this embodiment, the first cross-section of the multiphase flow guiding device on the first horizontal plane is located within the second cross-section of the test chamber of the heavy non-aqueous phase liquid migration test device on the first horizontal plane; the distance between any point on the edge of the first cross-section and the nearest point on the edge of the second cross-section is 1 mm to 2 mm; the gap between the multiphase flow guiding device and the test chamber of the heavy non-aqueous phase liquid migration test device is filled with a sealing medium, which is sludge or petroleum jelly.
[0036] Furthermore, in the embodiments of this application, the above-mentioned multiphase flow guiding device is made of corrosion-resistant polytetrafluoroethylene or stainless steel to resist the chemical erosion of heavy non-aqueous liquid in the multiphase fluid.
[0037] Furthermore, in this embodiment, the two side walls of the drain port 2 extend upward to form anti-overflow protrusions, which are arranged along the edge contour of the drain port 2.
[0038] Furthermore, in this embodiment, the aforementioned non-aqueous phase liquid measuring tank 11 is also provided with a fourth valve 12 for connecting a hydraulic sensor and a fifth valve 13 for discharging liquid; the hydraulic sensor is communicatively connected to the data acquisition module.
[0039] Furthermore, in this embodiment, the above-mentioned aqueous phase measuring device includes an electronic balance 9 and a beaker 8 disposed on the electronic balance 9, with the beaker 8 disposed below the water outlet 6; the electronic balance 9 is communicatively connected to the data acquisition module.
[0040] Furthermore, in this embodiment, the static pressure of the bottom liquid column in the multiphase separation tank 5 and the heavy non-aqueous phase liquid measuring tank 11 satisfies the following pressure balance relationship:
[0041]
[0042] in, This refers to the static pressure of the liquid column at the bottom of the multiphase separator. For measuring the static pressure of the liquid column at the bottom of the tank for heavy non-aqueous liquids, The density of water, The density of a heavy, non-aqueous liquid is given. The water phase height inside the multiphase separator. The height of the heavy non-aqueous phase liquid in the multiphase separator. To measure the height of the non-aqueous phase liquid in the measuring vessel, To prevent evaporation, cover the liquid level.
[0043] This application provides a high-precision heavy non-aqueous phase liquid migration test drainage device that eliminates phase retention. By setting a downwardly concave funnel-shaped variable slope guide surface and placing the drainage port at its lowest elevation, it ensures that the multiphase fluid is completely collected and discharged without dead angles under the action of gravity, fundamentally eliminating the phase retention problem of heavy non-aqueous phase liquid at the bottom edge in traditional flat-bottom test chambers. At the same time, by utilizing the communicating vessel structure composed of a multiphase separation tank and a heavy non-aqueous phase liquid measuring tank, combined with a hydraulic sensor and an electronic balance, independent and continuous dynamic monitoring of the heavy non-aqueous phase liquid and the aqueous phase is realized, significantly improving the measurement accuracy of phase flow.
[0044] The working process of the device provided in this application is as follows: When the multiphase fluid flows in from the first valve 4, the height of the heavy non-aqueous liquid in the multiphase separation tank 5 increases, and water of the same volume as the flowing multiphase fluid is discharged from the outlet 6 into the beaker 8. The total overflow volume is calculated by the water phase measuring device. At the same time, the high-precision hydraulic sensor connected to the fourth valve 12 is converted into the heavy non-aqueous liquid volume by the volume calibration method. This volume is equal to the volume of the flowing multiphase fluid. Finally, the total overflow volume is subtracted from the calculated heavy non-aqueous liquid volume to obtain the actual volume of the water phase liquid that actually flows out through the porous medium during this time period.
[0045] To facilitate the accurate conversion of pressure signals detected by hydraulic sensors into the volume of heavy non-aqueous liquids, this application also provides a method for calibrating the flow rate of heavy non-aqueous liquids, applicable to the aforementioned device, such as... Figure 3 As shown, it includes the following steps:
[0046] S1. Open the second, third, and fourth valves, and close the first and fifth valves; add heavy non-aqueous phase liquid to the multiphase separation tank until the tank capacity is half full, and add aqueous phase liquid to the multiphase separation tank until water flows out of the outlet; add distilled water to the heavy non-aqueous phase liquid measuring tank to cover the surface of the heavy non-aqueous phase liquid;
[0047] S2. Inject known volumes of heavy non-aqueous liquid into the heavy non-aqueous liquid measuring vessel according to a preset volume gradient;
[0048] For example, the preset volume gradient can be 1 mL, 2 mL, 3 mL... increments at equal intervals until it covers the full range of the heavy non-aqueous phase liquid measuring vessel, and the number of calibration points is no less than 5.
[0049] S3. After each volume gradient injection is completed and the liquid level stabilizes, the corresponding pressure stability value is recorded synchronously through the hydraulic sensor to obtain multiple sets of volume-pressure data pairs.
[0050] It should be noted that the number of the above multiple sets of volume-pressure data pairs is greater than or equal to 7.
[0051] S4. Based on multiple sets of volume-pressure data pairs, regression analysis was performed using the least squares method to construct a mapping function V=f(P) between the volume V of the heavy non-aqueous phase liquid and the pressure value P.
[0052] S5. In the actual heavy non-aqueous phase liquid migration test, the pressure signal obtained in real time by the hydraulic sensor is input into the mapping function and converted in real time to obtain the real-time volume of the heavy non-aqueous phase liquid in the heavy non-aqueous phase liquid measuring tank.
[0053] This application provides a method for calibrating the flow rate of heavy non-aqueous liquids. By gradient injection of a known volume of heavy non-aqueous liquid and simultaneous recording of pressure values, a volume-pressure mapping function is constructed using regression analysis. This transforms the pressure signal from a hydraulic sensor into the volume data of the heavy non-aqueous liquid in real time and accurately. This method avoids the visual errors and reading lag problems caused by manual liquid level readings in traditional methods, achieving high-precision, dynamic online monitoring of the flow rate of heavy non-aqueous liquids and providing a reliable data foundation for subsequent correction calculations of the aqueous phase flow rate.
[0054] To accurately deduct the volume of water phase overflowed due to sedimentation and displacement of heavy non-aqueous liquids, and thus obtain the true water phase flow rate through the porous medium in the test chamber, this application also provides a method for correcting the water phase flow rate, applicable to the aforementioned apparatus, such as... Figure 4 As shown, it includes the following steps:
[0055] Step 1: During operation, the total physical quantity of the aqueous phase liquid overflowing from the outlet of the multiphase separator is continuously collected by the aqueous phase measurement device and converted into the total volume of the overflow aqueous phase.
[0056] Step 2: Obtain the pressure signal of the hydraulic sensor at the synchronization time, and convert it into the volume of the heavy non-aqueous phase liquid according to the above-mentioned heavy non-aqueous phase liquid flow calibration method. The volume of the heavy non-aqueous phase liquid is the amount of water phase that is forced to overflow from the outlet due to gravity settling and displacement.
[0057] Step 3: Under the same time period, subtract the amount of water phase displaced from the total overflow water phase volume to obtain the actual volume of water phase liquid flowing out through the porous medium during that time period.
[0058] This application provides a method for correcting aqueous phase flow rate. By accurately deducting the excess aqueous phase displacement caused by the gravitational settling of heavy non-aqueous liquids from the total overflow aqueous phase volume, the method eliminates volume displacement interference caused by density differences, thereby obtaining the actual volume of aqueous phase liquid passing through the porous medium. This method effectively solves the problem of traditional measurements being unable to distinguish between the true aqueous phase flow rate and the passively displaced water volume, significantly improving the measurement accuracy of aqueous phase flow rate and providing more reliable experimental data for analyzing groundwater pollution migration patterns and evaluating remediation effects.
[0059] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0060] The above-described 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A high precision heavy non-aqueous phase liquid migration test drain-down apparatus that eliminates phase trapping, characterized by, The device includes a multiphase flow guiding device and a multiphase flow separation monitoring device. The multiphase flow guiding device is horizontally mounted at the bottom of the test chamber of the heavy non-aqueous phase liquid migration test device. The multiphase flow guiding device includes a drain outlet, a variable slope guiding surface, and a guiding base. The multiphase flow separation monitoring device includes a multiphase separation tank, a heavy non-aqueous phase liquid measuring tank, and an aqueous phase measuring device. The multiphase separation tank includes a first valve, a second valve, and a water outlet. The first valve and the second valve are positioned opposite each other at the bottom of the multiphase separation tank, and the water outlet is located at the top of the multiphase separation tank and is higher than the first valve. The heavy non-aqueous phase liquid measuring tank includes a third valve. The multiphase flow guiding device and the multiphase flow separation monitoring device are connected by a pipe connecting the drain outlet and the first valve. The multiphase separation tank and the heavy non-aqueous phase liquid measuring tank are connected by a connector connecting the second valve and the third valve. The aqueous phase measuring device is located directly below the water outlet.
2. The apparatus of claim 1, wherein, The drain outlet is set through the guide chassis and serves as the only channel for the discharge of multiphase fluid; the variable slope guide surface forms the top surface of the multiphase guide device, which is a smooth curved surface in the shape of a downwardly concave funnel, and the variable slope guide surface continuously slopes downward with the location of the drain outlet as the center of convergence, so that the drain outlet is located at the lowest elevation of the variable slope guide surface.
3. The apparatus of claim 2, wherein, The first cross-section of the multiphase flow guiding device on the first horizontal plane is located within the second cross-section of the test chamber of the heavy non-aqueous phase liquid migration test device on the first horizontal plane; the distance between any point on the side of the first cross-section and the nearest point on the side of the second cross-section is 1 mm to 2 mm. The gaps in the test chambers of the multiphase flow guiding device and the heavy non-aqueous phase liquid migration test device are filled with a sealing medium, which is sludge or petroleum jelly.
4. The apparatus of claim 3, wherein, The multiphase flow guiding device is made of corrosion-resistant polytetrafluoroethylene, acrylic, or stainless steel to resist the chemical erosion of heavy non-aqueous liquids in multiphase fluids.
5. The apparatus of claim 2, wherein, The two sidewalls of the drain outlet extend upward to form anti-overflow protrusions, which are arranged along the edge contour of the drain outlet.
6. The apparatus of claim 1, wherein, The heavy non-aqueous liquid measuring tank is also equipped with a fourth valve for connecting a hydraulic sensor and a fifth valve for discharging liquid; the hydraulic sensor is communicatively connected to the data acquisition module.
7. The apparatus of claim 6, wherein, The aqueous phase measuring device includes an electronic balance and a beaker mounted on the electronic balance, with the beaker positioned below the water outlet; the electronic balance is communicatively connected to the data acquisition module.
8. The apparatus of claim 1, wherein, The static pressure of the bottom liquid column in the multiphase separation tank and the heavy non-aqueous phase liquid measuring tank satisfies the following pressure balance relationship: ； wherein, Pw is the static pressure of the water phase in the liquid column at the bottom of the multi-phase separation tank, Pw is the static pressure of the water phase in the liquid column at the bottom of the multi-phase separation tank, pw is the density of water, pw is the density of the heavy non-aqueous phase liquid, Hw is the height of the water phase in the multi-phase separation tank, Hw is the height of the water phase in the multi-phase separation tank, Hw is the height of the water phase in the multi-phase separation tank, Hw is the height of the water phase in the multi-phase separation tank, 9. A method for calibrating the flow of a heavy non-aqueous phase liquid, applied to the device according to any one of claims 1 to 8, characterized in that, include: Open the second valve, the third valve, and the fourth valve, and close the first valve and the fifth valve; add heavy non-aqueous liquid to the multiphase separation tank to half the tank capacity, and add aqueous phase to the multiphase separation tank until water flows out of the outlet; add distilled water to the heavy non-aqueous liquid measuring tank to cover the surface of the heavy non-aqueous liquid; A known volume of heavy non-aqueous phase liquid is sequentially injected into the heavy non-aqueous phase liquid measuring vessel according to a preset volume gradient; After each volume gradient injection is completed and the liquid level stabilizes, the corresponding pressure stability value is recorded synchronously by the hydraulic sensor to obtain multiple sets of volume-pressure data pairs. Based on the multiple sets of volume-pressure data pairs, regression analysis was performed using the least squares method to construct a mapping function V=f(P) between the volume V of the heavy non-aqueous phase liquid and the pressure value P. In the actual heavy non-aqueous phase liquid migration test, the pressure signal acquired in real time by the hydraulic sensor is input into the mapping function, and the real-time volume of the heavy non-aqueous phase liquid in the heavy non-aqueous phase liquid measuring tank is obtained in real time.
10. A method for water phase flow rate correction, applied to the apparatus of any one of claims 1-8, characterized in that, include: During operation, the total physical quantity of the aqueous phase liquid overflowing from the outlet of the multiphase separator is continuously collected by the aqueous phase measuring device and converted into the total overflow volume of the aqueous phase. The pressure signal of the hydraulic sensor at the synchronous time is obtained and converted into the volume of heavy non-aqueous liquid according to the method of claim 9. The volume of heavy non-aqueous liquid is the amount of water phase that is forced to overflow from the outlet due to gravity settling and displacement. At the same time, the actual volume of the aqueous phase flowing out through the porous medium is obtained by subtracting the amount of aqueous phase displacement from the total overflow volume of the aqueous phase during that time period.