Visualized multi-physical field oil medium dehydration experiment platform and method

Abstract

A visualized multi-physics field oil medium dehydration experimental platform and method includes: a dehydration tank with a transparent tank wall and a first connecting seat with a boss on the bottom plate; a high-voltage module for dehydrating the oil medium using a high-voltage electric field; a magnetic field module for applying a magnetic field to the oil medium for dehydration; an ultrasonic module for applying an ultrasonic field to the oil medium for dehydration; a camera for recording video of water droplet coalescence in the oil medium during each dehydration experiment; and a processor for sending an activation signal and dehydration parameters to at least one of the high-voltage module, magnetic field module, and ultrasonic module during each dehydration experiment. After obtaining and analyzing the water droplet coalescence videos corresponding to at least two experiments, the optimal dehydration parameters of the oil medium are obtained. This method can simulate the dehydration effect under single and multi-physics fields and obtain more accurate physical dehydration parameters, providing technical support for the physical dehydration of crude oil emulsions in practical industrial applications.

Description

Technical Field

[0001] This article relates to the field of oil media dehydration, and in particular to a visualized multiphysics field oil media dehydration experimental platform and method. Background Technology

[0002] The large amount of water produced during oil extraction increases the power consumption of pipeline transportation, fuel consumption during heating, causes corrosion of metal pipelines and scaling of equipment, and affects subsequent oil refining processes. Therefore, the dehydration process of water-containing crude oil emulsions has become a very important part of the oilfield industry. Currently, emulsifiers are added to crude oil emulsions for dehydration, followed by electro-dehydration. However, the use of emulsifiers is extremely harmful to the environment and human health. At the same time, the fixed parameters of electro-dehydration cannot efficiently achieve the dehydration process of crude oil emulsions. There is an urgent need for a more environmentally friendly and efficient dehydration method. Summary of the Invention

[0003] This application provides a visualized multi-physics field oil medium dehydration experimental platform and method, which can simulate the dehydration effect under single and multi-physics fields, and obtain more accurate and efficient dehydration parameters, providing technical support for the physical and chemical dehydration of crude oil emulsions in practical industrial applications.

[0004] On the one hand, embodiments of this application provide a visualized multiphysics field oil media dehydration experimental platform, including:

[0005] Dehydration module: includes a dehydration tank for holding oil medium, the tank wall material of the dehydration tank is transparent, and the bottom plate of the dehydration tank is a first connecting seat with a boss.

[0006] High-pressure module: includes a first high-pressure electrode and a second high-pressure electrode disposed opposite to each other in the dehydration tank, the first high-pressure electrode and the second high-pressure electrode being used to generate a high-pressure electric field after being energized, so as to dehydrate the oil medium located between the first high-pressure electrode and the second high-pressure electrode;

[0007] Magnetic field module and / or ultrasonic module: disposed outside the dehydration tank, the magnetic field module is used to apply a magnetic field to the oil medium for dehydration, and the ultrasonic module is used to apply an ultrasonic field to the oil medium for dehydration;

[0008] Camera: mounted outside the wall of the dehydration tank, used to record video of water droplet coalescence occurring in the oil medium during each dehydration experiment, including video of water droplets falling on the protrusion.

[0009] The processor is used to send an activation signal and dehydration parameters to at least one of the high-voltage module, the magnetic field module, and the ultrasonic module during each dehydration experiment; after acquiring at least two water droplet coalescence videos corresponding to the dehydration experiments, it analyzes the acquired multiple water droplet coalescence videos to obtain the optimal dehydration parameters for the oil medium; wherein the dehydration parameters include at least one of the following: high-voltage electric field parameters, magnetic field parameters, and ultrasonic field parameters.

[0010] On the other hand, this application also provides a visualized multiphysics field oil medium dehydration experimental method, which is executed based on the visualized multiphysics field oil medium dehydration experimental platform described in the above embodiments, and includes:

[0011] The spectrometer scans at multiple predetermined locations around the plasma to acquire the three-dimensional emission spectrum of the plasma;

[0012] Perform one or more dehydration experiments, each of which includes:

[0013] The processor sends an activation signal and dehydration parameters to at least one of the high-voltage module, magnetic field module, and ultrasonic module.

[0014] The camera records video of water droplet coalescence occurring in the oil medium in the dehydration tank, including video of water droplets falling on the boss and sends it to the processor.

[0015] After acquiring the water droplet coalescence video corresponding to at least two dehydration experiments, the processor analyzes the acquired water droplet coalescence video to obtain the optimal dehydration parameters for the oil medium.

[0016] Compared with related technologies, the visualized multiphysics field oil medium dehydration experimental platform and method of this application adopts a purely physical approach to obtain the optimal dehydration parameters of the oil medium. It can simulate the dehydration effect under single and multiphysics fields. At the same time, the visualized experimental method can realistically simulate the dehydration scenario of crude oil emulsion and obtain more accurate dehydration parameters. It provides technical support for the physical and chemical dehydration of crude oil emulsion in actual industrial applications, thereby reducing the application of emulsifiers during crude oil emulsion dehydration and reducing the harm caused by emulsifiers to the environment and human body.

[0017] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the embodiments described in the description and the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0019] Figure 1 This is a schematic diagram of the first mode of a visualized multiphysics field oil medium dehydration experimental platform according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the first connecting seat and the second connecting seat according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the second mode of a visualized multiphysics field oil medium dehydration experimental platform according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the third mode of a visualized multiphysics field oil medium dehydration experimental platform according to an embodiment of this application;

[0023] Figure 5 This is a bottom view of the top cover of the rectangular dehydration tank according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the attractive force between dipoles in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of water droplet distribution before ultrasonic action according to an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of water droplet distribution after ultrasonic treatment according to an embodiment of this application;

[0027] Figure 9 This is a flowchart illustrating a visual multiphysics field oil medium dehydration experimental method according to an embodiment of this application. Detailed Implementation

[0028] This application describes several embodiments, but these descriptions are exemplary and not limiting, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0029] This application includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this application can also be combined with any conventional features or elements to form unique inventive solutions. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution. Therefore, it should be understood that any feature shown and / or discussed in this application can be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the appended claims.

[0030] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that it does not depend on such a specific order. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims concerning the method and / or process should not be limited to the steps performed in the written order, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments of this application.

[0031] This application provides a visualized multiphysics field oil media dehydration experimental platform, such as... Figure 1 As shown, it includes:

[0032] Dehydration module: includes a dehydration tank for holding oil medium, the tank wall material of the dehydration tank is transparent, and the bottom plate of the dehydration tank is a first connecting seat with a boss.

[0033] High-pressure module: includes a first high-pressure electrode and a second high-pressure electrode disposed opposite to each other in the dehydration tank, the first high-pressure electrode and the second high-pressure electrode being used to generate a high-pressure electric field after being energized, so as to dehydrate the oil medium located between the first high-pressure electrode and the second high-pressure electrode;

[0034] Magnetic field module and / or ultrasonic module: disposed outside the dehydration tank, the magnetic field module is used to apply a magnetic field to the oil medium for dehydration, and the ultrasonic module is used to apply an ultrasonic field to the oil medium for dehydration;

[0035] Camera: mounted outside the wall of the dehydration tank, used to record video of water droplet coalescence occurring in the oil medium during each dehydration experiment, including video of water droplets falling on the protrusion.

[0036] The processor is used to send an activation signal and dehydration parameters to at least one of the high-voltage module, the magnetic field module, and the ultrasonic module during each dehydration experiment; after acquiring at least two water droplet coalescence videos corresponding to the dehydration experiments, it analyzes the acquired multiple water droplet coalescence videos to obtain the optimal dehydration parameters for the oil medium; wherein the dehydration parameters include at least one of the following: high-voltage electric field parameters, magnetic field parameters, and ultrasonic field parameters.

[0037] In this embodiment, the tank wall of the dehydration tank is made of a transparent material, such as tempered glass or transparent plastic, which facilitates the camera to capture video of water droplet aggregation inside the entire dehydration tank. The first connecting seat can be connected to the tank wall of the dehydration tank by bolts. During each dehydration experiment, only one of the high-voltage module, magnetic field module, and ultrasonic module can be turned on, or two modules can work together, or all three modules can work together. Small water droplets aggregate under the action of the physical field to form large water droplets, and the large water droplets fall to the bottom of the dehydration tank under the action of gravity, thus completing the oil medium dehydration experiment.

[0038] In this embodiment, the water droplet coalescence video is a video of water droplet coalescence throughout the entire dehydration tank, including the water droplet coalescence process occurring on the boss. The surface of the boss can be set as a smooth plane to reduce the influence of the surface material of the boss on water droplet coalescence. The processor analyzes the water droplet coalescence video obtained from multiple dehydration experiments to obtain the optimal dehydration parameters for the oil medium, which can be used in the dehydration process of crude oil emulsion in actual production.

[0039] In this embodiment, the first high-voltage electrode and the second high-voltage electrode can be made of stainless steel, and the surface is polished smooth to prevent edge effects caused by the high-voltage electrode.

[0040] The visualized multiphysics oil medium dehydration experimental platform in this embodiment uses purely physical methods to obtain the optimal dehydration parameters of the oil medium. It can simulate the dehydration effect under single and multiphysics fields. At the same time, the visualized experimental method can realistically simulate the dehydration scenario of crude oil emulsion and obtain more accurate dehydration parameters. It provides technical support for the physical and chemical dehydration of crude oil emulsion in actual industrial applications, thereby reducing the use of emulsifiers during crude oil emulsion dehydration and reducing the harm caused by emulsifiers to the environment and human body.

[0041] In one exemplary embodiment, the visualized multiphysics oil medium dehydration experimental platform further includes: a second connecting seat;

[0042] The magnetic field module includes a winding rod, and the ultrasonic module includes an ultrasonic transducer.

[0043] The upper surface of the second connector is used to connect the lower end of the winding bar, and the lower surface is used to connect the ultrasonic transducer.

[0044] In this embodiment, the second connecting seat can be completely identical to the first connecting seat, that is, the structure and material are the same. The material can be 304 stainless steel, which will not be magnetized under the influence of a magnetic field, and both are provided with bosses, such as... Figure 2 As shown, external threads are provided on both the left and right sides of the boss, and internal threads are provided on both the left and right sides of the recessed area at the bottom of the boss; the ultrasonic transducer can be a piezoelectric ceramic transducer.

[0045] In one exemplary embodiment, the visualized multiphysics oil media dehydration experimental platform is connected in one of the following three modes:

[0046] First mode: The upper end of the winding rod is connected to the lower surface of the first connecting seat, the lower end of the winding rod is connected to the upper surface of the second connecting seat, and the upper surface of the ultrasonic transducer is connected to the lower surface of the second connecting seat, as shown below. Figure 1 As shown;

[0047] Second mode: The upper end of the winding bar is connected to the lower surface of the first connecting seat, and the lower end of the winding bar is connected to the upper surface of the second connecting seat, such as... Figure 3 As shown;

[0048] Third mode: The upper surface of the ultrasonic transducer is connected to the lower surface of the first connecting seat, such as... Figure 4 As shown.

[0049] In this embodiment, the visualized multiphysics oil-medium dehydration experimental platform in the first mode includes a high-pressure module, a magnetic field module, and an ultrasonic module, such as... Figure 1 As shown, the winding rod of the magnetic field module has internal threads at its upper and lower ends. A connecting bolt connects the internal thread at the upper end of the winding rod to the internal thread of the first connecting seat, and the internal thread at the lower end of the winding rod connects to the external thread of the second connecting seat. Thus, the magnetic field module is located between the first and second connecting seats. Coupling agent is coated on the lower part of the second connecting seat and the upper part of the ultrasonic transducer. The ultrasonic transducer is fixed to the lower part of the second connecting seat by the coupling agent. The recessed area under the boss of the second connecting seat is also filled with coupling agent. The first mode of the visualized multiphysics oil-medium dehydration experimental platform can include five operating modes: 1. The high-pressure module, magnetic field module, and ultrasonic module are all in operation; 2. The high-pressure module and magnetic field module are in operation; 3. The magnetic field module and ultrasonic field module are in operation; 4. The high-pressure module operates alone; 5. The magnetic field module operates alone.

[0050] In this embodiment, the visualized multiphysics oil-medium dehydration experimental platform in the second mode includes a high-pressure module and a magnetic field module, such as... Figure 3 As shown, the winding rod of the magnetic field module has internal threads at its upper and lower ends. A connecting bolt is used to connect the internal thread at the upper end of the winding rod to the internal thread of the first connecting seat, and the internal thread at the lower end of the winding rod to the external thread of the second connecting seat. That is, the magnetic field module is located between the first and second connecting seats. The second mode of the visualized multiphysics field oil medium dehydration experimental platform can include three working modes: 1. The high-pressure module and the magnetic field module are in working state; 2. The high-pressure module works alone; 3. The magnetic field module works alone.

[0051] In this embodiment, the visualized multiphysics oil-medium dehydration experimental platform in the third mode includes a high-pressure module and an ultrasonic module, such as... Figure 4 As shown, a coupling agent is coated on the lower part of the first connecting seat and the upper part of the ultrasonic transducer. That is, the ultrasonic transducer is fixed to the lower part of the first connecting seat by the coupling agent. The recessed area under the boss of the first connecting seat is also filled with coupling agent. The third mode of the visualized multiphysics oil medium dehydration experimental platform can include three working modes: 1. The high-pressure module and the ultrasonic module are in working state; 2. The high-pressure module works alone; 3. The ultrasonic module works alone.

[0052] In one exemplary embodiment, the magnetic field module further includes:

[0053] Excitation coil: wound around the winding bar and connected to the magnetic field power supply to generate the magnetic field;

[0054] Magnetometer: Used to measure the magnetic flux generated by the magnetic field inside the dehydration tank;

[0055] The magnetic field power supply is used to provide current to the excitation coil.

[0056] In this embodiment, the excitation coil and fluxmeter are as follows: Figure 1 and Figure 3 As shown; the fluxmeter is inserted into the oil medium of the dehydration tank through the fluxmeter hole in the top cover of the dehydration tank; the material of the excitation coil can be high-temperature resistant enameled wire with a maximum heat resistance temperature of 180℃; the magnetic field power supply can generate three forms of voltage waveforms: AC square wave, AC sine wave and DC wave, and one of the voltage waveforms can be selected according to the actual experimental requirements. The AC output amplitude range of the magnetic field power supply can be -15KV to +15KV, the DC output range can be 0KV to +30KV, and the magnetic field frequency adjustment range can be 0-400HZ.

[0057] In one exemplary embodiment, the ultrasound module further includes:

[0058] Ultrasonic generator: used to convert mains power into a high-frequency alternating current signal that matches the ultrasonic transducer, wherein the high-frequency alternating current signal is converted into mechanical vibration by the ultrasonic transducer to form the ultrasonic field.

[0059] In this embodiment, the power range of the ultrasonic generator is 0-0.64KW, and the ultrasonic generator is electrically connected to the ultrasonic transducer through a wire.

[0060] In one exemplary embodiment, the dehydration module further includes:

[0061] Top cover: Covers the top of the dehydration tank and is provided with a first slide, a second slide and a liquid inlet, the liquid inlet being used to inject the oil medium and water droplets into the dehydration tank;

[0062] Baffle: includes a bottom baffle covering the non-protrusion portion of the first connector and a side baffle covering the side of the protrusion. The material is insulating material, used to prevent the first high-voltage electrode and the second high-voltage electrode from discharging to the first connector. The material of the first connector is metal. The height of the side baffle is greater than the height of the protrusion.

[0063] Thermostatic heating element: Covers part of the dehydration tank wall and is out of the camera's field of view, used to maintain the dehydration temperature at the preset experimental temperature.

[0064] In this embodiment, in addition to the first slide, the second slide, and the liquid inlet, the top cover may also be provided with a fluxmeter hole through which the fluxmeter can pass, such as... Figure 5 The top view of the rectangular dehydration tank shown shows a ring of bolt holes around the top cover, which can be bolted to the tank wall. When the dehydration tank is cylindrical, the top cover is circular and can also be provided with a first slide, a second slide, a liquid inlet, a flux meter hole, and a ring of bolt holes.

[0065] In this embodiment, the baffle is made of insulating material, such as polytetrafluoroethylene. The height of the side of the baffle is greater than the height of the boss in order to prevent the first high-voltage electrode and the second high-voltage electrode from discharging onto the boss. The material of the first connecting seat can be 304 stainless steel.

[0066] In this embodiment, the constant temperature heating element can be a heating material such as a silicone heating element. When the dehydration tank is a cuboid or cube, the constant temperature heating element can be covered on three sides of the outer surface of the tank wall, and the camera is aimed at the remaining side to capture video of water droplet aggregation. When the dehydration tank is a cylinder, the constant temperature heating element can be covered on one-half or three-quarters of the outer surface of the tank wall, as long as it does not obstruct the camera's field of view. The setting of the constant temperature heating element ensures that the dehydration experiment is carried out under constant temperature conditions, ensuring uniform dehydration of the oil medium, and avoiding the influence of temperature on the dehydration efficiency.

[0067] In one exemplary embodiment, the high-voltage module further includes:

[0068] First electrode connector: made of insulating material, one end of which is connected to the first high-voltage electrode;

[0069] Second electrode connector: made of insulating material, one end of which is connected to the second high-voltage electrode;

[0070] First bolt connector: Connects to the other end of the first electrode connector, used to drive the first electrode connector to move in the length and / or width direction of the first slide to adjust the position of the first high-pressure electrode in the oil medium;

[0071] Second bolt connector: Connects to the other end of the second electrode connector, used to drive the second electrode connector to move in the length and / or width direction of the second slide, so as to adjust the position of the second high-pressure electrode in the oil medium;

[0072] High-voltage power supply: connects the first high-voltage electrode and the second high-voltage electrode, and is used to form the high-voltage electric field between the first high-voltage electrode and the second high-voltage electrode.

[0073] In this embodiment, the first bolt connector, the first electrode connector, and the first high-voltage electrode are connected in sequence, and the second bolt connector, the second electrode connector, and the second high-voltage electrode are connected in sequence, as follows: Figure 1 , Figure 3 and Figure 4 As shown; the insulating material for the first electrode connector and the second electrode connector can be polytetrafluoroethylene.

[0074] In this embodiment, the first bolt connector and the second bolt connector can receive the electrode adjustment signal sent by the processor and move along the first slide and the second slide to adjust the distance between the first high-voltage electrode and the second high-voltage electrode, the depth of the first high-voltage electrode and the second high-voltage electrode in the dehydration tank, and the distance from the camera. The high-voltage electric field parameters include the electrode adjustment signal. In addition to the processor automatically adjusting the position of the first high-voltage electrode and the second high-voltage electrode, the position of the first high-voltage electrode and the second high-voltage electrode can also be manually adjusted.

[0075] In this embodiment, the high-voltage power supply can generate three types of voltage waveforms: AC square wave, AC sine wave, and DC wave. One of the voltage waveforms can be selected according to the actual experimental requirements. The AC output amplitude range of the high-voltage power supply can be -15KV to +15KV, the DC output range can be 0KV to +30KV, and the high-voltage electric field frequency adjustment range can be 0-5000HZ.

[0076] In one exemplary embodiment, the oil medium is white oil.

[0077] In this embodiment, white oil is used as the oil medium because white oil is similar in properties to crude oil and can be used as a simulated medium for the dehydration treatment of crude oil emulsion. At the same time, white oil is a colorless medium with good visibility, which makes it easy for the camera to record the video of water droplet aggregation in the oil medium.

[0078] In one exemplary embodiment, the high-voltage electric field parameters include: the distance between the first high-voltage electrode and the second high-voltage electrode, the high-voltage electric field strength, the high-voltage electric field frequency, and the voltage waveform;

[0079] The magnetic field parameters include: magnetic field strength, magnetic field frequency, and magnetic field duration;

[0080] The ultrasonic field parameters include: ultrasonic intensity, ultrasonic frequency, and ultrasonic action time.

[0081] In this embodiment, the dehydration principle of the high-voltage module is as follows: small water droplets in the oil medium converge into larger water droplets under the action of a high-voltage electric field. Specifically, the small water droplets become polarized into dipoles under the action of the high-voltage electric field, and then coalesce under the attraction between the dipoles and the repulsion of the liquid film. The attraction between the dipoles is as follows: Figure 6 As shown.

[0082] In this embodiment, the attractive force F between two dipoles on the same straight line can be calculated using formula (1), where P is the electric dipole moment, l is the distance between the two dipoles, and ε is the electric dipole moment. o Let ε be the dielectric constant of the oil medium. wLet r be the dielectric constant of water, r be the radius of the water droplet, and E be the high voltage electric field strength. From formula (1), it can be seen that the attraction F between the two dipoles is proportional to the high voltage electric field strength E. That is, the higher E is, the more favorable it is for the water droplets to coalesce. However, during the experiment, the increase of the high voltage electric field strength E may cause problems such as short circuits and electrical dispersion. When the water content in the oil medium is high, the number of water droplets will increase, the water droplet radius r will increase, and the distance l between the two dipoles will decrease. The attraction F between the two dipoles will also be greater, which is conducive to the coalescence of water droplets. However, it is also necessary to consider that the high water content will increase the conductivity of the oil medium, which may cause short circuits between the first high voltage electrode and the second high voltage electrode. Therefore, when conducting the dehydration experiment of the oil medium, an appropriate high voltage electric field strength and water content should be set.

[0083]

[0084] In this embodiment, the liquid film repulsion between dipoles can be represented by the drainage velocity v. The formula for calculating the drainage velocity v is formula (2), where μ is the viscosity of the oil medium, r is the radius of the water droplet, h is the distance between the two water droplets, and F e It is the electric field force generated by the high-voltage module, F s It is the interaction force between the molecules of the two droplets. As can be seen from formula (2), when the viscosity μ of the oil medium is high and the radius r of the water droplet is large, the drainage velocity v is small. At this time, the liquid film repulsion between the dipoles is small, and it is not easy for them to coalesce.

[0085]

[0086] In this embodiment, the dehydration principle of the magnetic field module is as follows: water droplets in the oil medium will be subjected to a Lorentz force F under the action of a magnetic field. L The electric force f generated by the current that produces the magnetic field e Viscous resistance F d And interfacial tension, Lorentz force F L The calculation formula is formula (3), and the electric field force f e The calculation formula for is formula (4), and the viscous resistance F d The calculation formula is formula (5), where B in formula (3) is the magnetic field strength, Q is the charge of the water droplet, and v is the drainage velocity; in formula (4), σ' is the polarization charge density of the water droplet, and E' is the electric field strength generated by the magnetic field module; in formula (5), C D Represents the drag coefficient, v is the discharge velocity, and ρ is the displacement coefficient. o A represents the density of an oil medium excluding water. r This represents the projected area of ​​the water droplet.

[0087] F L =BQv…………………………………………(3)

[0088] f e =σ'·E'…………………………………………(4)

[0089]

[0090] In this embodiment, the induced electromotive force generated by the magnetic field module can include motional electromotive force and induced electromotive force, wherein the motional electromotive force originates from the Lorentz force F. L The calculation formula is formula (6); the induced electromotive force is generated by the changing magnetic field. Since both oil and water are dielectrics, polarization charges will be generated on the surface of the water droplets due to polarization under the action of the magnetic field. Therefore, under the electric field force f e The polarization charge generated under the action of the electric field can be calculated using the formula (7) for the polarization charge density σ' under the action of the electric field; in formula (6), B is the magnetic field strength, L is the diameter of the water droplet, and v is the drainage velocity; in formula (7), Let P2 be the unit outward normal vector of the oil-water interface, P1 be the polarization intensity of water, P2 be the polarization intensity of the oil medium, and ε0 be the vacuum permittivity, where ε0 = 8.842 × 10⁻⁶. -12 F / m;ε r1 =ε o / ε0, i.e., ε r1 Let be the relative permittivity of the oil medium, and ε be the permittivity of the oil. o The ratio of the dielectric constant of vacuum ε0, ε r1 It can take the value 2.3F / m; ε r2 =ε w / ε0, i.e., ε r2 Let be the relative permittivity of water, and ε be the permittivity of water. w The ratio of the vacuum permittivity ε0 to ε r2 It can be taken as 81 F / m; E' is the electric field strength generated by the magnetic field module.

[0091] U=BLv…………………………………………(6)

[0092]

[0093] In this embodiment, under the influence of a magnetic field, the interfacial tension and interfacial stability between the oil medium and the water droplet decrease, the water droplet becomes polarized, and the charged particles H and O in the water molecules cut the magnetic field lines, generating a Lorentz force F that does no work but changes the trajectory of the water droplet. L When two or more water droplets come into contact, they will coalesce under the drive of interfacial tension, forming a larger water droplet.

[0094] In this embodiment, the dehydration principle of the ultrasonic module is as follows: water droplets in the oil medium, under the action of the ultrasonic field, undergo displacement and collision effects, causing the water droplets to continuously move towards the antinodes or nodes of the ultrasonic waves and collide with them, thus coalescing into larger water droplets. These larger water droplets then separate from the oil medium under the influence of gravity. The displacement effect of the water droplets is as follows: Figure 7 The water droplet distribution before ultrasonic treatment is shown. Figure 8 The distribution of water droplets after ultrasonic treatment is shown.

[0095] In this embodiment, under the action of ultrasound, the water droplet is mainly subjected to three forces: the drift force F caused by the asymmetry of the water droplet's motion. A The drift force F caused by sound pressure radiation R The drift force F caused by changes in temperature and viscosity v .

[0096] In this embodiment, F A The calculation formula is formula (7):

[0097]

[0098] In formula (7), m w Let be the weight of the water droplet, k be the wavenumber of the ultrasound, U0 be the electric potential across the ends of the water droplet, x0 be the instantaneous equilibrium position of the water droplet, and μ be the electric potential. w Calculate according to formula (8):

[0099]

[0100] In formula (8), ω is the angular frequency of the ultrasonic field, and τ w The relaxation time of water.

[0101] In this embodiment, F R The calculation formula is formula (9):

[0102] F R =πρ w |A| 2 (kr w ) 3 ρ w-o sin2kx0……………………(9)

[0103] In formula (9), ρ w Let |A| be the density of water, |A| be the velocity potential amplitude of the flow field formed by the water droplet under the action of the ultrasonic field, k be the wave number of the ultrasonic wave, and r be the velocity of the water droplet. w Let ρ be the radius of the water droplet, x0 be the instantaneous equilibrium position of the water droplet, and ρ be the radius of the water droplet. w-o The relative density coefficient is calculated using formula (10):

[0104]

[0105] In formula (10), ρ w ρ is the density of water. o This represents the density of the oil medium.

[0106] In this embodiment, F v The calculation formula is formula (11):

[0107]

[0108] In formula (11), H is a coefficient, and r w Let η be the water droplet radius, η be the dynamic viscosity of the oil medium, c be the ultrasonic velocity in the oil medium, and ρ be the velocity of sound. o Let U be the density of the oil medium, U0 be the electric potential across the water droplet, k be the wavenumber of the ultrasonic wave, x0 be the instantaneous equilibrium position of the water droplet, and μ be the density of the oil medium. o The calculation formula is formula (12):

[0109]

[0110] In formula (12), ω is the angular frequency of the ultrasonic field, and τ w The relaxation time of water.

[0111] In this embodiment, the three drift forces mentioned above, namely F, are considered. A F R and F v The formula for calculating the force F* exerted on a water droplet in the direction of ultrasonic wave propagation under the action of an ultrasonic field can be expressed as formula (13):

[0112] F*=m w x0+6πηr w x0 = F A +F R +F v ………………………(13)

[0113] In formula (13), m w Let x be the weight of the water droplet, x0 be the instantaneous equilibrium position of the water droplet, η be the dynamic viscosity of the oil medium, and r be the velocity of the water droplet. w Let be the radius of the water droplet.

[0114] In this embodiment, when F* > 0, the water droplet moves towards the antinode; when F* < 0, the water droplet moves towards the node; as... Figure 7 and Figure 8 As shown, the displacement effect gives water droplets more opportunities to collide, which is the main theoretical basis for ultrasonic dehydration.

[0115] This application embodiment also provides a visualized multiphysics field oil medium dehydration experimental method. The method is executed based on the visualized multiphysics field oil medium dehydration experimental platform described in the above embodiments, and includes steps S100-S300, as follows: Figure 9 As shown:

[0116] Perform one or more dehydration experiments, each of which includes S100-S200:

[0117] S100: The processor sends an activation signal and dehydration parameters to at least one of the high-voltage module, magnetic field module, and ultrasonic module;

[0118] S200: The camera records video of water droplet coalescence occurring in the oil medium in the dehydration tank, the water droplet coalescence video including video of water droplets falling on the boss coalescence and sends it to the processor;

[0119] S300: After the processor acquires the water droplet coalescence video corresponding to at least two dehydration experiments, it analyzes the acquired water droplet coalescence video to obtain the optimal dehydration parameters for the oil medium.

[0120] In this embodiment, at least two dehydration experiments are required. Steps S100-S200 are steps that must be performed in each dehydration experiment. In each dehydration experiment, the camera acquires the corresponding water droplet aggregation video and sends it to the processor. Each dehydration experiment corresponds to the dehydration parameters of that experiment. After the processor acquires the water droplet aggregation video corresponding to each dehydration experiment, step S300 is executed. The dehydration parameters corresponding to the water droplet aggregation video are comprehensively compared and analyzed. The dehydration parameters corresponding to the dehydration method with the lowest dehydration time cost or the most energy-efficient dehydration method can be taken as the optimal dehydration parameters.

[0121] In this embodiment, before conducting the first dehydration experiment, a camera is set up so that its field of view can fully observe all parts of the dehydration tank. The dehydration tank is cleaned to avoid stains appearing in the camera's field of view. The dehydration tank is then filled with white oil to prepare for the dehydration experiment.

[0122] In this embodiment, the dehydration experiment can be set to the water content of the white oil, and the corresponding optimal dehydration parameters can be obtained for different water contents.

[0123] In this embodiment, before each dehydration experiment, water droplets are dripped into the liquid inlet of the top cover. Then, the processor sends an activation signal and dehydration parameters to at least one of the high-voltage module, magnetic field module, and ultrasonic module. Modules that do not receive activation signals and dehydration parameters are in a closed state. After recording the water droplet aggregation video of the dehydration experiment, the water droplets in the white oil can be sucked out with a syringe to prepare for the next dehydration experiment.

[0124] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term "computer storage medium" includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

Claims

1. A visualized multi-physical field oil medium dehydration experiment platform, characterized in that, include: Dehydration module: includes a dehydration tank for holding oil medium, the tank wall material of the dehydration tank is transparent, and the bottom plate of the dehydration tank is a first connecting seat with a boss. High-pressure module: includes a first high-pressure electrode and a second high-pressure electrode disposed opposite to each other in the dehydration tank, the first high-pressure electrode and the second high-pressure electrode being used to generate a high-pressure electric field after being energized, so as to dehydrate the oil medium located between the first high-pressure electrode and the second high-pressure electrode; Magnetic field module and / or ultrasonic module: disposed outside the dehydration tank, the magnetic field module is used to apply a magnetic field to the oil medium for dehydration, and the ultrasonic module is used to apply an ultrasonic field to the oil medium for dehydration; Camera: mounted outside the wall of the dehydration tank, used to record video of water droplet coalescence occurring in the oil medium during each dehydration experiment, including video of water droplets falling on the protrusion. The processor is used to send an activation signal and dehydration parameters to at least one of the high-voltage module, the magnetic field module, and the ultrasonic module during each dehydration experiment; after acquiring at least two water droplet coalescence videos corresponding to the dehydration experiments, it analyzes the acquired multiple water droplet coalescence videos to obtain the optimal dehydration parameters for the oil medium; wherein the dehydration parameters include at least one of the following: high-voltage electric field parameters, magnetic field parameters, and ultrasonic field parameters.

2. The visualized multi-physics oil medium dehydration experimental platform of claim 1, wherein, Also includes: Second connecting seat; The magnetic field module includes a winding rod, and the ultrasonic module includes an ultrasonic transducer. The upper surface of the second connector is used to connect the lower end of the winding bar, and the lower surface is used to connect the ultrasonic transducer.

3. The visualized multi-physics oil medium dehydration experimental platform of claim 2, wherein, The visualized multiphysics oil media dehydration experimental platform is connected in one of the following three modes: First mode: The upper end of the winding rod is connected to the lower surface of the first connecting seat, the lower end of the winding rod is connected to the upper surface of the second connecting seat, and the upper surface of the ultrasonic transducer is connected to the lower surface of the second connecting seat. Second mode: The upper end of the winding bar is connected to the lower surface of the first connecting seat, and the lower end of the winding bar is connected to the upper surface of the second connecting seat; Third mode: The upper surface of the ultrasonic transducer is connected to the lower surface of the first connecting seat.

4. The visualized multi-physics oil medium dehydration experimental platform of claim 3, wherein, The magnetic field module also includes: Excitation coil: wound around the winding bar and connected to the magnetic field power supply to generate the magnetic field; Magnetometer: Used to measure the magnetic flux generated by the magnetic field inside the dehydration tank; The magnetic field power supply is used to provide current to the excitation coil.

5. The visualized multi-physics oil medium dehydration experimental platform of claim 3, wherein, The ultrasound module also includes: Ultrasonic generator: used to convert mains power into a high-frequency alternating current signal that matches the ultrasonic transducer, wherein the high-frequency alternating current signal is converted into mechanical vibration by the ultrasonic transducer to form the ultrasonic field.

6. The visualized multi-physics oil medium dehydration experimental platform of claim 1, wherein, The dehydration module also includes: Top cover: Covers the top of the dehydration tank and is provided with a first slide, a second slide and a liquid inlet, the liquid inlet being used to inject the oil medium and water droplets into the dehydration tank; Baffle: includes a bottom baffle covering the non-protrusion portion of the first connector and a side baffle covering the side of the protrusion. The material is insulating material, used to prevent the first high-voltage electrode and the second high-voltage electrode from discharging to the first connector. The material of the first connector is metal. The height of the side baffle is greater than the height of the protrusion. Thermostatic heating element: Covers part of the dehydration tank wall and is out of the camera's field of view, used to maintain the dehydration temperature at the preset experimental temperature.

7. The visualized multi-physics oil medium dehydration experimental platform of claim 6, wherein, The high-voltage module also includes: First electrode connector: made of insulating material, one end of which is connected to the first high-voltage electrode; Second electrode connector: made of insulating material, one end of which is connected to the second high-voltage electrode; First bolt connector: Connects to the other end of the first electrode connector, used to drive the first electrode connector to move in the length and / or width direction of the first slide to adjust the position of the first high-pressure electrode in the oil medium; Second bolt connector: Connects to the other end of the second electrode connector, used to drive the second electrode connector to move in the length and / or width direction of the second slide, so as to adjust the position of the second high-pressure electrode in the oil medium; High-voltage power supply: connects the first high-voltage electrode and the second high-voltage electrode, and is used to form the high-voltage electric field between the first high-voltage electrode and the second high-voltage electrode.

8. The visualized multiphysics oil medium dehydration experimental platform as described in claim 1, characterized in that: The oil medium is white oil.

9. The visualized multiphysics oil medium dehydration experimental platform as described in claim 1, characterized in that: The high-voltage electric field parameters include: the distance between the first high-voltage electrode and the second high-voltage electrode, the high-voltage electric field strength, the high-voltage electric field frequency, and the voltage waveform; The magnetic field parameters include: magnetic field strength, magnetic field frequency, and magnetic field duration; The ultrasonic field parameters include: ultrasonic intensity, ultrasonic frequency, and ultrasonic action time.

10. A visualized multi-physics oil medium dehydration experimental method, characterized in that, The method is performed based on the visualized multiphysics oil media dehydration experimental platform as described in any one of claims 1-9, and includes: Perform one or more dehydration experiments, each of which includes: The processor sends an activation signal and dehydration parameters to at least one of the high-voltage module, magnetic field module, and ultrasonic module. The camera records video of water droplet coalescence occurring in the oil medium in the dehydration tank, including video of water droplets falling on the boss and sends it to the processor. After acquiring the water droplet coalescence video corresponding to at least two dehydration experiments, the processor analyzes the acquired water droplet coalescence video to obtain the optimal dehydration parameters for the oil medium.

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