Wave-electric dual field oilfield produced fluid treatment device

Abstract

The present disclosure relates to a wave-electric dual field oilfield produced fluid treatment device, a box of the device comprises a dehydration cavity and a transition layer treatment cavity. A first thermal radiation coalescence electrode is arranged in the dehydration cavity for promoting the coalescence of the dispersed phase in the oilfield produced fluid. A first flat net demulsification electrode is arranged in the dehydration cavity on the side away from the mounting surface of the first thermal radiation coalescence electrode to form a first demulsification electric field. A flat net dehydration electrode is arranged in the dehydration cavity on the side away from the first thermal radiation coalescence electrode of the first flat net demulsification electrode to form a dehydration electric field. A transition layer transfer assembly is used to transport the transition layer formed in the dehydration cavity into the transition layer treatment cavity. An ultrasonic treatment unit is arranged in the transition layer treatment cavity for generating an ultrasonic cavitation field to act on the transition layer to separate the oil phase therein. Through the synergistic design of "thermal-electric" demulsification dehydration and ultrasonic waves, efficient continuous dehydration of the oilfield produced fluid is realized, and the problem of frequent shutdown of the equipment caused by the accumulation of the transition layer is solved.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation technology for produced oil from oilfields, and in particular to a wave-electric dual-field oilfield produced fluid treatment device. Background Technology

[0002] Currently, commonly used dehydration technologies in oilfields mainly include chemical demulsification, electro-dehydration, and their combined processes. Chemical demulsification breaks down the oil-water interface film by adding demulsifiers, but it often suffers from incomplete demulsification, high reagent costs, and the introduction of new chemical contaminants when dealing with highly emulsified produced fluids. Electro-dehydration includes dehydration using AC, DC, or high-voltage pulsed electric fields, which utilize electric field forces to promote the coalescence and sedimentation of water droplets. However, for complex produced fluids with high water content, high salinity, and solid impurities, the treatment effect is unstable and energy consumption is high.

[0003] In actual dehydration processes, regardless of whether chemical or electric field methods are used, a complex and highly stable transition layer (also known as the "intermediate layer" or "emulsion layer") forms at the oil-water interface in the middle of the dehydration equipment. This transition layer includes incompletely demulsified residual crude oil, mechanical impurities such as mud and sand, colloids, asphaltenes, and residual polymers, with a water content reaching 60%-80%. As the transition layer accumulates and thickens within the equipment, it reduces the effective processing volume, causes the electric field to be short-circuited or distorted, and leads to a sharp decline in separation efficiency.

[0004] Existing oilfield produced fluid treatment units mostly adopt a single-function, modular design. For example, pretreatment, electro-dehydration, and transition layer treatment units are often independent and connected by external pipelines. This design results in large system footprint, high energy consumption, and low integration and automation levels. Furthermore, there is a lack of effective online treatment methods for the transition layer, requiring shutdown after only a few days of operation to clean the transition layer manually or mechanically. This severely affects the continuous and stable operation of the unit, increasing operating costs and safety risks. Summary of the Invention

[0005] To address at least some of the aforementioned technical problems, this disclosure provides a wave-electric dual-field oilfield produced fluid treatment device. Through the synergistic design of "thermal-electric" gradient demulsification and dehydration with ultrasonic treatment of the transition layer, it achieves efficient and continuous dehydration of oilfield produced fluid and fundamentally solves the problem of frequent equipment shutdowns caused by the accumulation of the transition layer.

[0006] In a first aspect, embodiments of this disclosure provide a wave-electric dual-field oilfield produced fluid treatment device, comprising: a housing, a first thermal radiation coalescing electrode, a first flat-net demulsifying electrode, a flat-net dehydrating electrode, and a transition layer transfer assembly. The housing includes a dehydration chamber and a transition layer treatment chamber arranged in parallel, with the first thermal radiation coalescing electrode, the first flat-net demulsifying electrode, and the flat-net dehydrating electrode disposed within the dehydration chamber.

[0007] The first thermal radiation coalescing electrode is used to radiate heat to the oilfield produced fluid flowing through it in order to promote the coalescence of the dispersed phase in the oilfield produced fluid.

[0008] The first flat-mesh demulsifying electrode is located on the side of the first thermal radiation coalescing electrode away from the mounting surface of the wave-electric dual-field oilfield produced fluid treatment device, so as to form a first demulsifying electric field between the first thermal radiation coalescing electrode and the first flat-mesh demulsifying electrode.

[0009] The flat mesh dehydration electrode is located on the side of the first flat mesh demulsifying electrode away from the first thermal radiation coalescence electrode, so as to form a dehydration electric field between the first flat mesh demulsifying electrode and the flat mesh dehydration electrode.

[0010] The transition layer transfer assembly is located inside the chamber and is used to transport the transition layer formed in the dehydration chamber to the transition layer processing chamber.

[0011] An ultrasonic processing unit, located within the transition layer processing cavity, is used to generate an ultrasonic cavitation field that acts on the transition layer to separate the oil phase within it.

[0012] The mounting surface is parallel to the horizontal plane, or the mounting surface forms a first angle with the horizontal plane. The arrangement direction of the dehydration chamber and the transition layer treatment chamber is parallel to the mounting surface, or the arrangement direction of the dehydration chamber and the transition layer treatment chamber forms a second angle with the mounting surface.

[0013] In some embodiments, the plane containing the first thermal radiation coalescing electrode intersects the plane containing the mounting surface.

[0014] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes: an inlet and a distribution pipeline. The inlet is located on the housing and communicates with the dehydration chamber. The distribution pipeline is located inside the dehydration chamber and communicates with the inlet; the portion of the distribution pipeline located inside the dehydration chamber is positioned between the first thermal radiation coalescing electrode and the flat mesh demulsifying electrode.

[0015] In some embodiments, the transition layer transfer assembly includes a transition layer collection line located on the side of the liquid distribution line near the mounting surface. The inlet end of the transition layer collection line communicates with the dehydration chamber, and the outlet end of the transition layer collection line communicates with the transition layer processing chamber.

[0016] In some embodiments, the transition layer transfer assembly includes a transition layer collection pipeline, the inlet end of which is connected to the dehydration chamber, and the outlet end of which is connected to the transition layer processing chamber.

[0017] In some embodiments, the ultrasonic processing unit includes an ultrasonic transducer, which is disposed on the side of the transition layer collection pipe near the mounting surface and is adjacent to or in contact with the transition layer collection pipe; the ultrasonic waves are used to cavitate, break up and disperse the transition layer entering the transition layer processing cavity.

[0018] In some embodiments, the method further includes: a second thermal radiation coalescing electrode and a second flat-mesh demulsifying electrode disposed within the transition layer processing cavity. The second thermal radiation coalescing electrode is used to radiate heat to the transition layer flowing through it to promote the coalescence of the dispersed phase in the transition layer. The second flat-mesh demulsifying electrode is located on the side of the second thermal radiation coalescing electrode away from the mounting surface to form a second demulsifying electric field between the second thermal radiation coalescing electrode and the second flat-mesh demulsifying electrode.

[0019] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device includes a thermal radiation coalescing electrode, which includes at least one of a first thermal radiation coalescing electrode and a second thermal radiation coalescing electrode.

[0020] The thermal radiation coalescing electrode includes multiple heating tubes arranged in parallel to form a plate-shaped electrode or a blade-shaped electrode; or, the thermal radiation coalescing electrode includes at least one heating tube arranged in a ring-shaped manner to form an annular electrode.

[0021] In some embodiments, the heating element is an induction heating element.

[0022] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes: a first oil-water interface detection unit, a second oil-water interface detection unit, a second thermal radiation coalescence electrode, a second flat-grid demulsification electrode, and a control system.

[0023] The first oil-water interface detection unit is located inside the dehydration chamber and is used to detect the position of the oil-water interface within the dehydration chamber. The second oil-water interface detection unit is located inside the transition layer treatment chamber and is used to detect the position of the oil-water interface within the transition layer treatment chamber. The second thermal radiation coalescence electrode and the second flat-network demulsification electrode are located inside the transition layer treatment chamber and are used to form a second demulsification electric field.

[0024] The control system is used to adjust the intensity of the electric field in the dehydration chamber according to the position of the oil-water interface in the dehydration chamber, and to adjust the intensity of the electric field in the transition layer treatment chamber according to the position of the oil-water interface in the transition layer treatment chamber. The electric field in the dehydration chamber includes a first demulsification electric field and a dehydration electric field, while the electric field in the transition layer treatment chamber includes a second demulsification electric field.

[0025] In some embodiments, the produced fluid includes shale oil produced fluid, heavy oil produced fluid, ternary composite flooding produced fluid, or polymer-containing flooding produced fluid.

[0026] The wave-electric dual-field oilfield produced fluid treatment device provided in this disclosure significantly improves technical efficiency by integrating and arranging the dehydration chamber and transition layer treatment chamber in parallel, and respectively configuring a "thermal-electric" synergistic gradient demulsification and dehydration system and an ultrasonic cavitation treatment system. Inside the dehydration chamber, a first thermal radiation coalescing electrode first heats and reduces viscosity and initiates coalescence in the produced fluid. Subsequently, a first flat-grid demulsification electrode and the high-intensity first demulsification electric field it forms achieve deep demulsification, while the flat-grid dehydration electrode completes final refining and dehydration through a stable dehydration electric field. Simultaneously, the device uses a transition layer transfer component to transport the complex transition layer inevitably generated during dehydration to the transition layer treatment chamber online, where it is broken down and separated using a cavitation field generated by the ultrasonic treatment unit, effectively recovering the crude oil within. This design physically isolates and specifically addresses the main cause of shutdown in traditional equipment (the transition layer), thereby fundamentally ensuring that the equipment can operate continuously and stably for a long time. It significantly improves the dehydration efficiency and adaptability of difficult-to-treat produced fluids such as those with high emulsification and high sand content, and has good engineering application value due to its compact integrated structure. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0028] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the wave-electric dual-field oilfield produced fluid treatment device provided in the embodiments of this disclosure;

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Housing; 2. First thermal radiation coalescing electrode; 3. First flat mesh demulsifying electrode; 4. Flat mesh dehydrating electrode; 5. Transition layer transfer assembly; 6. Oil collection pipeline; 7. Ultrasonic transducer; 8. Second thermal radiation coalescing electrode; 9. Second flat mesh demulsifying electrode;

[0032] 11. Dehydration chamber; 12. Transition layer treatment chamber; 51. Liquid inlet end of transition layer collection pipeline;

[0033] J, Liquid distribution pipeline; P1, First drain outlet; P2, Second drain outlet; P3, Third drain outlet; Y1, First oil-water interface detection unit; Y2, Second oil-water interface detection unit; D1, Induction thermal radiation power supply; D2, Concentrated dehydration power supply. Detailed Implementation

[0034] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0035] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0036] This disclosure provides a wave-electric dual-field oilfield produced fluid treatment device, which will be described in detail below with reference to specific embodiments.

[0037] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device includes a housing 1, which includes a dehydration chamber 11 and a transition layer treatment chamber 12 arranged in parallel.

[0038] For example, the housing 1 can be a pressure-resistant and corrosion-resistant sealed cavity structure. Furthermore, the material of the housing 1 includes, but is not limited to, stainless steel, carbon steel lined with plastic, or fiberglass, adapting to the high-salt, high-corrosion working environment of oilfield sites, effectively extending the service life of the housing 1, preventing leakage due to media corrosion, ensuring the sealing of the oilfield produced fluid treatment process, preventing environmental pollution and safety hazards caused by media leakage, and simultaneously, the pressure-resistant design can adapt to high-pressure conditions (e.g., 0.5MPa-3MPa) during the oilfield produced fluid transportation process, improving the operational safety of the wave-electric dual-field oilfield produced fluid treatment device.

[0039] For example, the chamber 1 may be divided into a dehydration chamber 11 and a transition layer treatment chamber 12 by a sealing partition, or the dehydration chamber 11 and the transition layer treatment chamber 12 may be two independent chambers located in the chamber 1.

[0040] The dehydration chamber 11 and the transition layer treatment chamber 12 are independent of each other and arranged in parallel, which realizes the physical separation of the main crude oil dehydration process and the transition layer secondary treatment process. This avoids the transition layer flowing back into the dehydration chamber 11 and causing secondary pollution to the separated oil phase. At the same time, it provides an independent space for the treatment of the transition layer, laying a structural foundation for the efficient treatment of the subsequent transition layer and ensuring the independence and effectiveness of each treatment process.

[0041] For example, the spacing between the dehydration chamber 11 and the transition layer treatment chamber 12 is designed according to the dimensions of the housing 1 and the on-site installation space. For instance, the spacing between the dehydration chamber 11 and the transition layer treatment chamber 12 ranges from 50mm to 200mm (including the extreme values ​​at the ends). This facilitates the installation and fixing of the sealing partition, provides sufficient space for the subsequent laying of pipelines and interfaces, and avoids excessive spacing that would result in redundant housing 1 volume and occupy too much on-site space.

[0042] For example, the wave-electric dual-field oilfield produced fluid treatment device can be installed on the ground, or it can be installed on a mounting bracket or a mounting platform. Based on this, the mounting surface of the wave-electric dual-field oilfield produced fluid treatment device (hereinafter referred to as the mounting surface) can be the ground, the surface of the mounting bracket, or the surface of the mounting platform.

[0043] The mounting surface can be parallel to the horizontal plane or inclined at a certain angle to the horizontal plane. It has strong adaptability and meets the spatial requirements of different installation scenarios such as oilfield wellheads, gathering and transportation stations, and mobile processing equipment.

[0044] The wave-electric dual-field oilfield produced fluid treatment device can be installed on the ground, on a mounting bracket, or on a mounting platform. It can be parallel to the horizontal plane or form a first angle with the horizontal plane, which can meet the spatial requirements of different installation scenarios such as oilfield wellheads, gathering and transportation stations, and mobile treatment equipment. It has a wider range of installation scenarios and can adapt to complex on-site spatial conditions.

[0045] In consideration of the process errors that may occur during the preparation of the installation site, the production process errors that may occur during the production of the wave-electric dual-field oilfield produced fluid treatment device, and the installation process errors that may occur during the on-site installation, the installation surface can be parallel to the horizontal plane, or the installation surface and the horizontal plane can form a first included angle.

[0046] For example, the angle of the first included angle is greater than 0°.

[0047] For example, the angle of the first included angle is less than or equal to 10°.

[0048] Specifically, the first included angle is, for example, 0.5°, 1°, 3°, 5°, 8°, or 10°. Considering the production process errors that may occur during the production of the wave-electric dual-field oilfield produced fluid treatment device, as well as the installation process errors that may occur during on-site installation, the arrangement direction of the dehydration chamber 11 and the transition layer treatment chamber 12 can be parallel to the installation surface, or the arrangement direction of the dehydration chamber 11 and the transition layer treatment chamber 12 can form a second included angle with the installation surface.

[0049] For example, the angle of the second included angle is greater than 0°.

[0050] For example, the second included angle is less than or equal to 10°.

[0051] Specifically, the second included angle is, for example, 0.5°, 1°, 3°, 5°, 8°, or 10°.

[0052] The design of the first and second included angles takes into account various process errors that may occur during production and installation. It allows for deviations of a certain range (≤10°) between the installation surface and the horizontal plane, and between the arrangement direction of the two cavities and the installation surface. This reduces the production difficulty and on-site installation difficulty of the wave-electric dual-field oilfield produced fluid treatment device, reduces problems such as installation failure and structural deformation caused by process errors, and lowers production and installation costs.

[0053] By limiting the first and second included angles to the range of 0° to 10°, both the adaptability to process errors and the fact that excessive deviations would not affect the core processing logic of the device (subsequent gravity settling, electric field separation, etc.) are taken into account. This ensures that after the wave-electric dual-field oilfield produced fluid treatment device is installed, the arrangement of the dehydration chamber 11 and the transition layer treatment chamber 12 can still basically match the direction of gravity, laying the foundation for subsequent electrode layout and medium separation, and achieving a dual balance between error adaptation and treatment effect.

[0054] To facilitate a clear description of the relative positions of the components in the wave-electric dual-field oilfield produced fluid treatment device, the following uses the ground as the mounting surface as an example to illustrate some embodiments of this disclosure.

[0055] In some embodiments, such as Figure 1 As shown, the wave-electric dual-field oilfield produced fluid treatment device also includes a first thermal radiation coalescence electrode 2, a first flat mesh demulsification electrode 3, and a flat mesh dehydration electrode 4, all located in the dehydration chamber 11.

[0056] The first thermal radiation coalescing electrode 2 radiates heat to the oilfield produced fluid flowing through it, promoting the coalescence of the dispersed phase. The first flat-mesh demulsifying electrode 3 is located on the side of the first thermal radiation coalescing electrode 2 furthest from the mounting surface, forming a first demulsifying electric field between the two electrodes. The flat-mesh dehydrating electrode 4 is located on the side of the first flat-mesh demulsifying electrode 3 furthest from the first thermal radiation coalescing electrode 2, forming a dehydrating electric field between the two electrodes.

[0057] Furthermore, the wave-electric dual-field oilfield produced fluid treatment device also includes a transition layer transfer assembly 5. The transition layer transfer assembly 5 is located inside the housing 1 and is used to transport the transition layer formed in the dehydration chamber 11 to the transition layer treatment chamber 12.

[0058] In this embodiment, the layered arrangement of electrodes (with the first thermal radiation coalescence electrode 2 at the bottom, and the first flat mesh demulsification electrode 3 and the flat mesh dehydration electrode 4 at the top) conforms to the basic principle of gravity sedimentation. Due to their different densities, oil, water, and solids undergo preliminary separation under gravity after entering the dehydration chamber 11, with the oil phase floating upwards and the water and solid phases sinking. Gravity sedimentation is a prerequisite for all subsequent electro-demulsification processes. This arrangement allows the floating oil phase to flow sequentially through each electrode, achieving step-by-step processing and synergistic effects of gravity sedimentation and electric field.

[0059] The first thermal radiation coalescence electrode 2 is located in the lower part of the dehydration chamber 11. For the floating oil phase, the viscosity of the oilfield produced fluid entering the dehydration chamber 11 is reduced by thermal radiation heating. At the same time, it promotes the initial coalescence of the dispersed phase water droplets in the oilfield produced fluid, laying the foundation for the deep demulsification of the subsequent first demulsification electric field. This solves the problem of low demulsification efficiency and high energy consumption caused by the emulsion entering the demulsification electric field directly without preheating and initial coalescence.

[0060] The first flat demulsifying electrode 3 and the first thermal radiation coalescing electrode 2 are paired to form the first demulsifying electric field. When the first thermal radiation coalescing electrode 2 is a blade-shaped electrode, its sharp edge can generate a local high-intensity pulse (impact) electric field. This area serves as the core area of ​​electro-demulsification, and high voltage can be used to deeply demulsify the preheated and initially coalesced emulsion, instantly breaking through the stubborn oil-water interface film and achieving core demulsification treatment of the emulsion. Compared with a uniform electric field, the demulsification efficiency and thoroughness are greatly improved.

[0061] A dehydration electric field is formed between the flat mesh dehydration electrode 4 and the first flat mesh demulsification electrode 3. The intensity of the dehydration electric field is lower than that of the first demulsification electric field, and its distribution is more uniform and stable. This field is used to treat the oil phase after deep demulsification, causing the remaining tiny water droplets to further coalesce and settle, ultimately achieving deep dehydration of the crude oil and meeting the requirements of oilfield crude oil gathering and transportation. Compared with the first flat mesh demulsification electrode 3, the flat mesh dehydration electrode 4 has a smaller aperture flat mesh design, which can improve the interception and coalescence effect of tiny water droplets and ensure the accuracy of deep dehydration.

[0062] The transition layer transfer component 5 is arranged in the oil-water interface region of the dehydration chamber 11 (between the first flat mesh demulsifying electrode 3 and the flat mesh dehydration electrode 4). It can promptly transport the transition layer (a viscous phase of oil, water and solid mixture) formed in the dehydration chamber 11 to the transition layer processing chamber 12. This prevents the transition layer from accumulating in the dehydration chamber 11, which would cause the oil-water interface to move upward, thereby changing the spacing between the electrodes and disrupting the stability of the electric field parameters. At the same time, it prevents the transition layer from adsorbing the already aggregated water droplets, ensuring the continuity of the deep dehydration effect, and also prevents the transition layer from mixing with the separated oil phase, causing secondary pollution.

[0063] The electrodes in the dehydration chamber 11 have clearly defined functions and are interconnected, forming a complete processing flow of "gravity sedimentation → preheating coalescence → deep demulsification → deep dehydration → transition layer transfer", which enables the wave-electric dual-field oilfield produced fluid treatment device to have both processing efficiency and processing accuracy.

[0064] For example, the first thermal radiation coalescing electrode 2 can be an inductive thermal radiation coalescing electrode, possessing the functional basis of heating, coalescing, and electrode in one. The specific structure of the first thermal radiation coalescing electrode 2 is described later and will not be repeated here.

[0065] For example, the first flat mesh demulsifying electrode 3 is located on the side (i.e. above) away from the mounting surface of the first thermal radiation coalescing electrode 2, and maintains a preset distance from the first thermal radiation coalescing electrode 2, and the two cooperate to form the first demulsifying electric field.

[0066] For example, the first flat mesh demulsifying electrode 3 may be a conductive metal flat mesh structure. The mesh wire material includes, but is not limited to, conductive and corrosion-resistant materials such as stainless steel and copper, and its surface may be provided with an anti-scaling coating to prevent the adsorption of solid impurities from affecting the electric field distribution.

[0067] For example, the flat mesh dehydration electrode 4 is located on the side (i.e. above) away from the first flat mesh demulsifying electrode 3 and the first thermal radiation coalescence electrode 2, maintaining a preset distance from the first flat mesh demulsifying electrode 3, and the two cooperate to form a dehydration electric field. The flat mesh dehydration electrode 4 is located at the uppermost part of the dehydration chamber 11 and is the top electrode of the dehydration chamber 11.

[0068] The flat mesh dehydration electrode 4 can be a conductive metal flat mesh structure. Furthermore, the mesh aperture of the flat mesh dehydration electrode 4 is, for example, smaller than that of the first flat mesh demulsifying electrode 3, which can improve the effect of coalescence and interception of tiny water droplets.

[0069] For example, the transition layer transfer component 5 is positioned in the oil-water interface region between the first flat mesh demulsifying electrode 3 and the flat mesh dehydrating electrode 4 in the dehydration chamber 11 (this region is the core area for the formation of the transition layer). Its inlet end is connected to the dehydration chamber 11, and its outlet end is connected to the transition layer processing chamber 12 through the sealing partition. It can be in the form of a pipeline, an overflow, or a combination of a "micro pump body + pipeline".

[0070] For example, an insulation layer can be added to the outside of the housing 1. The insulation layer can be made of a heat-resistant material with excellent heat insulation performance. By setting an insulation layer on the outside of the housing 1, the heat loss in the dehydration chamber 11 can be reduced, the heat radiation coalescence efficiency of the first heat radiation coalescence electrode 2 can be further improved, and energy consumption can be reduced.

[0071] In some embodiments, the plane containing the first thermal radiation coalescing electrode 2 intersects the plane containing the mounting surface.

[0072] For example, the first thermal radiation coalescing electrode 2 can be connected to the side wall of the dehydration chamber 11 through a fixed structure, with the tilt direction adapted to the inlet direction of the oilfield produced fluid, the thermally conductive and electrically conductive coating on the electrode surface remains intact, and the tilted electrodes form staggered flow channels.

[0073] Furthermore, the plane containing the first thermal radiation coalescing electrode 2 intersects the plane containing the mounting surface, forming a preset intersection angle. This preset intersection angle is, for example, greater than 0° and less than or equal to 60°. The preset intersection angle can be, for example, 5°, 10°, 15°, 20°, 25°, 30°, 45°, or 60°.

[0074] The plane where the first thermal radiation coalescing electrode 2 is located intersects with the mounting surface (inclined arrangement). Compared with the horizontal arrangement, within the same space in the lower part of the dehydration chamber 11, the contact area and contact time between the electrode and the floating oil phase can be greatly increased. During the floating process of the oil phase, it will flow along the inclined surface of the first thermal radiation coalescing electrode 2, and the contact with the first thermal radiation coalescing electrode 2 will be more sufficient, thereby significantly improving the thermal radiation heating effect and the dispersion phase coalescing effect, laying a good foundation for subsequent electro-demulsification treatment.

[0075] The inclined electrodes form staggered flow channels, which can guide and slightly disturb the floating oil phase, preventing the formation of dead zones (areas where the medium cannot flow) on the electrode surface. This ensures that the oil phase flows evenly through all areas of the electrode, achieving uniform preheating and coalescence. It also prevents local oil phases from being insufficiently heated or having poor coalescence, which could affect the deep demulsification effect of the subsequent first demulsification electric field, thus improving the uniformity of the pretreatment.

[0076] Based on the principle of gravity settling, the aqueous phase and heavy impurities will settle to the bottom of the tank 1 under the action of gravity. The inclined electrode surface will not become an accumulation surface for the aqueous phase and impurities. The impurities will slide down along the inclined electrode surface to the vicinity of the second drain outlet P2 at the bottom of the tank 1, which facilitates the timely discharge of impurities and avoids the accumulation of impurities on the electrode surface. This further ensures the thermal radiation efficiency and conductivity of the electrode and extends the service life of the electrode.

[0077] The cross angle formed between the first thermal radiation coalescing electrode 2 and the mounting surface can be flexibly adjusted to adapt to different installation scenarios (such as when there is a first included angle on the mounting surface) and produced fluid treatment needs, thereby improving the adaptability of the device. Compared with electrodes that are fixed horizontally or vertically arranged, it can better meet the complex installation conditions in oilfields and the treatment needs of different types of produced fluids (such as heavy oil).

[0078] In some embodiments, such as Figure 1As shown, the wave-electric dual-field oilfield produced fluid treatment device also includes: an inlet and a distribution pipeline J. The inlet is located on the housing 1 and is connected to the dehydration chamber 11. The distribution pipeline J is located inside the dehydration chamber 11 and is connected to the inlet; the portion of the distribution pipeline J located inside the dehydration chamber 11 is positioned between the first thermal radiation coalescing electrode 2 and the flat mesh demulsifying electrode.

[0079] For example, the liquid inlet can be a high-pressure resistant and corrosion-resistant interface structure, and its material can be the same as that of the housing 1.

[0080] Furthermore, the inlet can be located on the side wall of the housing 1 and connected to the lower middle part of the dehydration chamber 11. The diameter of the inlet can be designed according to the processing capacity of the wave-electric dual-field oilfield produced fluid treatment device. The inlet is externally connected to the oilfield produced fluid delivery pipeline, and flanges and seals can be configured at the interface to ensure the sealing of the connection and prevent produced fluid leakage.

[0081] For example, the liquid distribution pipeline J can be made of stainless steel or engineering plastic, which is oil-resistant and corrosion-resistant, and is located inside the dehydration chamber 11 and connected to the liquid inlet. The main body of the liquid distribution pipeline J is located between the first thermal radiation coalescing electrode 2 and the first flat mesh demulsifying electrode 3 inside the dehydration chamber 11. Specifically, the liquid distribution pipeline J can adopt a multi-branch liquid distribution structure, with multiple evenly distributed liquid distribution holes on the side wall of the pipeline. The diameter and spacing of the liquid distribution holes are designed according to the produced liquid processing volume and the dispersed phase particle size to achieve uniform liquid distribution of the produced liquid.

[0082] The inlet is located on the side wall of the tank 1 and connects to the lower part of the dehydration chamber 11. The distribution pipe J is located between the first thermal radiation coalescence electrode 2 and the first flat mesh demulsification electrode 3. This position is a key area in the dehydration chamber 11 where gravity settling has been initially completed and electro-demulsification is about to begin. The oilfield produced fluid enters this area through the inlet and the distribution pipe J, which can avoid disturbing the water phase and heavy impurities that have settled at the bottom of the tank 1 by directly entering the produced fluid, prevent the settled water phase and impurities from being mixed back into the oil phase, ensure the effect of gravity settling, and provide a stable medium environment for subsequent electro-demulsification treatment.

[0083] For example, the fluid distribution pipeline J adopts a multi-branch pipe structure and has uniformly distributed fluid distribution holes, which can achieve uniform distribution of oilfield produced fluid in the dehydration chamber 11, so that the produced fluid enters the area between the first thermal radiation coalescence electrode 2 and the first flat mesh demulsification electrode 3 evenly. This avoids problems such as breakdown of the first demulsification electric field and uneven demulsification efficiency caused by local concentration of produced fluid, ensures the overall demulsification effect of the first demulsification electric field, and improves the uniformity and stability of electro-demulsification.

[0084] The liquid distribution pipeline J is located above the first thermal radiation coalescing electrode 2. After the liquid is distributed, it flows downward and will flow again through the upper region of the first thermal radiation coalescing electrode 2, forming a secondary contact with the electrode. This further enhances the effect of thermal radiation heating and dispersion phase coalescing, making the dispersion phase water droplets more coalesced before the emulsion enters the first demulsification electric field. This significantly improves the efficiency of subsequent deep demulsification, realizing a progressive treatment of "preheating coalescing - secondary coalescing - deep demulsification" and optimizing the processing flow.

[0085] The combination of the inlet and the distribution pipeline J enables directional, quantitative, and uniform injection of oilfield produced fluid. The injection flow rate can be flexibly adjusted according to the processing capacity of the device. Combined with the uniform distribution of the fluid in the distribution pipeline J, the medium level in the dehydration chamber 11 is kept stable, avoiding large fluctuations in the liquid level that could cause changes in the electrode spacing of the first demulsification electric field and the dehydration electric field. This ensures the stability of the electric field parameters and provides a guarantee for the continuous and stable operation of the device.

[0086] In some embodiments, the transition layer transfer assembly 5 includes a transition layer collection pipe located on the side of the liquid distribution pipe J near the mounting surface. The inlet end 51 of the transition layer collection pipe is connected to the dehydration chamber 11, and the outlet end of the transition layer collection pipe is connected to the transition layer processing chamber 12.

[0087] For example, the transition layer collection pipeline can be a thick-walled stainless steel pipeline that is resistant to viscosity and corrosion. The entire transition layer collection pipeline is located on the side of the liquid distribution pipeline J closest to the installation surface (i.e., below the liquid distribution pipeline J), ​​and is arranged vertically and horizontally with the liquid distribution pipeline J without spatial interference. The transition layer collection pipeline can adopt a closed pipeline design to achieve precise and continuous delivery of the transition layer.

[0088] Specifically, the inlet end 51 of the transition layer collection pipeline can adopt a flared structure, corresponding to the oil-water interface area of ​​the dehydration chamber 11, and the outlet end passes through the sealing partition and communicates with the transition layer treatment chamber 12.

[0089] Furthermore, the pipeline can be configured with a miniature delivery pump (active delivery) or adopt an overflow design (passive delivery) to adapt to the delivery needs of transition layers with different flow rates.

[0090] The transition layer transfer component 5 adopts the form of a transition layer collection pipeline, which realizes the pipeline-type closed transport of the transition layer. Compared with the traditional overflow transfer, it avoids the oxidation and deterioration of the transition layer due to contact with air during the transfer process. At the same time, it prevents the viscous phase of the transition layer from adhering to the internal components of the box 1 (such as electrodes and partitions), ensuring the cleanliness of the inside of the box 1, and avoiding environmental pollution caused by the leakage of the transition layer, thus improving the sealing and environmental protection of the device.

[0091] The transition layer collection pipeline is located below the liquid distribution pipeline J. This location is the core area of ​​the oil-water interface in the dehydration chamber 11, and its height coincides with the formation position of the transition layer. This enables the collection of the transition layer near the oil-water interface, avoiding the problem of collecting the upper qualified oil phase due to the collection position being too high, or collecting the lower water phase due to the collection position being too low. This ensures that the medium transferred to the transition layer treatment chamber 12 is a pure transition layer, thereby improving the treatment efficiency of the transition layer treatment chamber 12.

[0092] The transition layer collection pipeline and the liquid distribution pipeline J are arranged in layers above and below each other without spatial interference. This ensures both the uniform liquid distribution effect of the liquid distribution pipeline J and the precise collection of the transition layer. This allows the processes of liquid inlet distribution, transition layer collection, oil phase flotation, and water phase sedimentation in the dehydration chamber 11 to be highly layered in space and do not interfere with each other. This improves the utilization rate of the internal space of the dehydration chamber 11 and makes the overall structure of the device more compact.

[0093] The transition layer collection pipeline can collect the transition layer formed in the dehydration chamber 11 in real time and continuously, avoiding the accumulation of the transition layer at the oil-water interface, which would cause the oil-water interface to move upward, thus ensuring the stability of the oil-water interface in the dehydration chamber 11. This ensures that the electrode spacing of the first demulsification electric field and the dehydration electric field remains unchanged and the electric field parameters remain stable. At the same time, it avoids the secondary mixing of the oil phase and water phase caused by the accumulation of the transition layer, ensuring the continuity of the deep dehydration effect of the dehydration chamber 11, and also providing a continuous and stable treatment medium for the transition layer treatment chamber 12.

[0094] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes a transition layer treatment component disposed in the transition layer treatment chamber 12, which is used to separate and recover the oil phase in the transition layer within the transition layer treatment chamber 12.

[0095] For example, the transition layer treatment component can be one or a combination of structures such as electric field demulsification, thermal radiation coalescence, and ultrasonic treatment (see below for details, which will not be elaborated here). Its placement corresponds to the liquid outlet end of the transition layer collection pipeline, ensuring that the transition layer can be treated immediately after entering the transition layer treatment chamber 12.

[0096] The transition layer collection pipeline and the transition layer treatment component work together to form a complete process of "collection-transportation-treatment" of the transition layer. The transition layer generated in the dehydration chamber 11 is accurately transported to the transition layer treatment chamber 12 through the collection pipeline, and is immediately treated by the transition layer treatment component. This achieves targeted treatment of the transition layer. Compared with the technical solution of no effective treatment of the transition layer and direct discharge leading to crude oil loss and environmental pollution, this improves the overall recovery rate of crude oil.

[0097] The transition layer treatment component is located inside the transition layer treatment chamber 12 and is physically separated from the dehydration process of the dehydration chamber 11. The treatment process of the transition layer will not interfere with the oil phase separation, electro-demulsification and other processes of the dehydration chamber 11. At the same time, the continuous liquid feeding and separation of the dehydration chamber 11 provides a continuous and stable treatment medium for the transition layer treatment chamber 12, realizing the synchronous and continuous operation of the main treatment of the dehydration chamber 11 and the secondary treatment of the transition layer treatment chamber 12, improving the overall treatment efficiency of the device, and enabling the device to have the dual functions of "main separation + secondary recovery".

[0098] The transition layer treatment component can separate and recover the oil phase in the transition layer, effectively extracting the crude oil that would otherwise be discharged from the transition layer, minimizing crude oil loss and bringing additional economic benefits to the oil field. At the same time, after the transition layer is treated, the volume of the viscous phase is greatly reduced, which facilitates centralized treatment and discharge through the sewage discharge structure, reduces environmental protection costs, and meets the requirements of refined and environmentally friendly treatment in the oil field.

[0099] The closed-loop transportation of the transition layer collection pipeline, combined with the immediate processing of the transition layer treatment components, avoids sedimentation, stratification, and secondary emulsification of the transition layer before processing. The transition layer enters the processing area directly through the collection pipeline, reducing the disturbance of the medium, ensuring the processing effect of the transition layer treatment components, improving the purity of the recovered oil phase, and ensuring that the water content of the recovered crude oil meets the gathering and transportation standards.

[0100] In some embodiments, such as Figure 1 As shown, the transition layer processing assembly includes an ultrasonic processing unit disposed within the transition layer processing cavity. The ultrasonic processing unit is used to generate an ultrasonic cavitation field that acts on the transition layer to separate the oil phase in the transition layer.

[0101] The ultrasonic cavitation field generated by the ultrasonic processing unit can quickly break the interfacial bonding force between the oil phase and other phases in the transition layer through the instantaneous impact and shear force generated by bubble rupture, thereby achieving efficient separation of the oil phase, significantly improving the separation rate and purity of the oil phase in the transition layer, and avoiding interference from oil phase residues to subsequent processing of the transition layer.

[0102] The oil phase is separated by ultrasonic physical action, eliminating the need for chemical separation agents and avoiding secondary pollution introduced by chemical agents. At the same time, it can protect other effective components in the transition layer besides the oil phase from being damaged, ensuring the effectiveness of subsequent recycling, reuse or deep treatment of the transition layer.

[0103] The ultrasonic cavitation field can penetrate evenly into the interior of the transition layer, achieving oil phase separation throughout the entire transition layer. This solves the problem of localized oil phase that is difficult to peel off or is not completely separated, improves the uniformity and stability of oil phase separation, and ensures that the quality of the treated transition layer meets the standards.

[0104] Ultrasonic treatment is simple to operate, consumes less energy, and does not damage the transition layer processing cavity and surrounding components. It can operate stably for a long time, reducing equipment wear and operating costs during the transition layer processing, and improving the economy and practicality of the overall processing flow.

[0105] By constructing a triple demulsification and separation mechanism of "electrodemulsification-thermal radiation coalescence-ultrasonic cavitation", the adaptability of the wave-electric dual-field oilfield produced fluid treatment device to the treatment of oilfield produced fluids with high emulsification, high sand content and high viscosity is improved, overcoming the technical defects of existing technologies that are sensitive to changes in produced fluid properties and have poor separation effect stability.

[0106] In some embodiments, such as Figure 1 As shown, the ultrasonic processing unit includes an ultrasonic transducer 7, which is located on the side of the transition layer collection pipe near the mounting surface and is adjacent to or attached to the transition layer collection pipe; the ultrasonic waves are used to cavitate, break up and disperse the transition layer entering the transition layer processing cavity 12.

[0107] For example, the ultrasonic transducer 7 is a high-frequency ultrasonic wave generating structure, located on the side of the transition layer collection pipe near the mounting surface (i.e. below the transition layer collection pipe), and arranged close to or attached to the transition layer collection pipe; the ultrasonic radiation surface of the transducer faces the liquid outlet end of the transition layer collection pipe, and is powered and controlled through the side wall of the housing 1 to cavitate, break up and disperse the transition layer entering the transition layer processing chamber 12.

[0108] The frequency of the ultrasonic transducer 7 is, for example, in the range of 20kHz to 50kHz (including the end extremes).

[0109] The ultrasonic transducer 7 is arranged close to or attached to the transition layer collection pipe and is located below the collection pipe. After the transition layer is discharged from the liquid outlet of the collection pipe, it immediately enters the ultrasonic radiation area of ​​the ultrasonic transducer 7, realizing the instantaneous ultrasonic treatment of the transition layer. This avoids the sedimentation and stratification of the transition layer before treatment, ensures the uniformity of ultrasonic treatment, and improves the treatment effect of the transition layer.

[0110] The ultrasonic transducer 7 uses high-frequency ultrasound to cavitate and disperse the transition layer. By utilizing the impact force of the bursting of tiny bubbles generated by the ultrasonic cavitation effect, the stubborn oil-water-solid interface film in the transition layer is broken down, and the large viscous phase particles in the transition layer are broken into fine dispersed phases, so that the oil phase encapsulated therein is fully released. This solves the technical pain point that the transition layer is too viscous and the interface film is stubborn, making it difficult to separate and recover the oil phase. This lays the foundation for further separation and recovery of the oil phase.

[0111] The dispersing effect of ultrasound makes the distribution of the transition layer in the transition layer processing cavity 12 more uniform, avoiding insufficient processing caused by local concentration of the transition layer. If other processing structures (such as electrodes) are added to the subsequent transition layer processing components, it can ensure that the transition layer and the processing structure are in full contact, thereby improving the overall processing efficiency of the transition layer processing cavity 12. At the same time, the cavitation effect of ultrasound can disperse the tiny solid particles in the transition layer, preventing the particles from agglomerating and clogging the third drain outlet P3 and the pipeline.

[0112] The ultrasonic transducer 7 is a non-contact processing structure that treats the transition layer only through ultrasonic radiation. It has no direct mechanical contact with the transition layer, no mechanical wear, and a long service life. Moreover, it produces no noise or pollutants during operation, meeting green and environmental protection requirements. At the same time, the transducer is easy to install and maintain, and can be inspected separately during continuous operation of the device without affecting the overall operation of the device.

[0113] In some embodiments, such as Figure 1 As shown, the wave-electric dual-field oilfield produced fluid treatment device further includes: a second thermal radiation coalescing electrode 8 and a second flat-mesh demulsifying electrode 9 disposed within the transition layer treatment chamber 12. The second thermal radiation coalescing electrode 8 is used to radiate heat to the transition layer flowing through it to promote the coalescence of the dispersed phase in the transition layer. The second flat-mesh demulsifying electrode 9 is located on the side of the second thermal radiation coalescing electrode 8 away from the mounting surface to form a second demulsifying electric field between the second thermal radiation coalescing electrode 8 and the second flat-mesh demulsifying electrode 9.

[0114] For example, the second thermal radiation coalescing electrode 8 may use the same structure and materials as the first thermal radiation coalescing electrode 2.

[0115] Specifically, the second thermal radiation coalescence electrode 8 can be a blade-shaped / plate-shaped induction thermal radiation coalescence electrode, located in the lower region of the transition layer processing chamber 12, corresponding to the liquid outlet end of the transition layer collection pipe, thereby radiating heat to the transition layer through which it flows, promoting the coalescence of the dispersed phase (released oil droplets and water droplets) in the transition layer.

[0116] For example, the second flat mesh demulsifying electrode 9 can adopt the desired structure and material as the first flat mesh demulsifying electrode 3. Specifically, the second flat mesh demulsifying electrode 9 can adopt a conductive metal flat mesh structure, with corrosion-resistant mesh wires and an anti-scaling coating on the surface. It is located in the upper middle part of the transition layer processing cavity 12, on the side of the second thermal radiation coalescing electrode 8 away from the mounting surface (i.e., above), and maintains a preset distance from the second thermal radiation coalescing electrode 8. The two work together to form a second demulsifying electric field.

[0117] By setting a second thermal radiation coalescence electrode 8 and a second flat mesh demulsification electrode 9, the transition layer treatment chamber 12 adopts the same core treatment principle of "thermal radiation coalescence + electric field demulsification" as the dehydration chamber 11, realizing the professional and in-depth treatment of the transition layer. In response to the characteristics of the oil phase in the transition layer being tightly wrapped and having high viscosity, a progressive treatment process of "ultrasonic disruption - thermal radiation coalescence - electric field demulsification" is formed, which greatly improves the separation and recovery efficiency of the oil phase in the transition layer.

[0118] The second thermal radiation coalescence electrode 8 and the second flat mesh demulsification electrode 9 are arranged sequentially along the direction of gravity, and their heights coincide with the upward floating path of the oil phase in the transition layer treatment chamber 12. After the transition layer is broken by ultrasonic cavitation, the oil phase floats up and flows sequentially through the second thermal radiation coalescence electrode 8 and the second demulsification electric field. The second thermal radiation coalescence electrode 8 heats and reduces the viscosity of the transition layer and promotes the coalescence of the dispersed phase. The second demulsification electric field performs deep demulsification on the coalesced medium, further releasing the encapsulated oil phase and achieving efficient recovery of the oil phase. This avoids the problem of incomplete treatment of the transition layer by a single treatment structure.

[0119] The second thermal radiation coalescing electrode 8 and the second flat mesh demulsifying electrode 9 have the same structure and materials as the first thermal radiation coalescing electrode 2 and the first flat mesh demulsifying electrode 3, respectively. This realizes the standardized design and universalization of functional electrodes, reduces the manufacturing cost of the device's components and the cost of subsequent maintenance, facilitates the replacement and repair of components on site, and improves the efficiency and convenience of the device's operation and maintenance.

[0120] The second demulsifying electric field, together with the first demulsifying electric field and the dehydration electric field of the dehydration chamber 11, forms a multi-field synergistic treatment system. This system enables the main emulsion (dehydration chamber 11) and the secondary transition layer (transition layer treatment chamber 12) of the oilfield produced fluid to receive targeted electric field treatment, achieving full coverage of the overall electric field treatment of the device. This not only ensures the deep dehydration effect of crude oil in the dehydration chamber 11, but also improves the oil phase recovery efficiency of the transition layer, minimizing crude oil loss.

[0121] In summary, the transition layer treatment chamber 12 adopts a structural design that combines ultrasonic cavitation demulsification, inductive thermal radiation coalescence, and circulating flow field. The transition layer is treated online through the ultrasonic action of the ultrasonic treatment unit and the thermal radiation action of the thermal radiation coalescence electrode, separating and recovering the residual oil phase in the transition layer. At the same time, the transition layer is degraded, decrosslinked, and oxidized to minimize the residue of the transition layer, thereby ensuring the long-term continuous and stable operation of the device without the need for frequent shutdowns for cleaning.

[0122] The wave-electric dual-field oilfield produced fluid treatment device achieves efficient demulsification under low-temperature conditions through intelligent coupling of induced thermal radiation (e.g., induced thermal radiation coalescing electrode) and impact electric field (e.g., first demulsification electric field and second demulsification electric field); at the same time, it achieves directional separation based on the characteristics of transition layer components, significantly reducing the energy consumption per ton of oil processed and the amount of chemical reagents used.

[0123] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes a drain pipe disposed in the transition layer treatment chamber 12, the drain pipe being used to obtain the viscous phase separated in the transition layer treatment chamber.

[0124] For example, the sewage pipe can be a thick-walled, viscous, and corrosion-resistant pipe, with its inlet end corresponding to the sedimentation area of ​​the viscous phase formed by the separation of the transition layer in the transition layer treatment chamber, and its outlet end connected to the third sewage outlet P3.

[0125] Specifically, the sewage pipeline can be equipped with a blockage-clearing structure to avoid pipeline blockage, ensure continuous acquisition of the viscous phase separated from the transition layer, and transport it to the third sewage outlet P3 for discharge.

[0126] The oil recovery pipeline 6 and the sewage discharge pipeline work together to form a complete closed-loop treatment process of "oil phase recovery + viscous phase discharge" in the transition layer treatment chamber 12. The qualified oil phase after separation by the treatment components in the transition layer is recovered immediately by the oil recovery pipeline 6, and the viscous phase is directionally transported by the sewage discharge pipeline to the third sewage outlet P3 for discharge. The two are spatially layered and functionally complementary, realizing the resource recovery and harmless treatment of the transition layer, and solving the technical problem of separating and transporting the oil phase and viscous phase after the transition layer treatment.

[0127] The oil recovery pipeline 6 is located above all functional electrodes, and the sewage discharge pipeline is located in the viscous phase settling area of ​​the transition layer treatment chamber 12. The two have no spatial interference within the housing 1, and form a highly compatible spatial layout with the functional electrodes, transition layer collection pipelines, and other structures, making the overall structure of the device more compact and the layout more reasonable, improving the utilization rate of the space in the housing 1, while ensuring the independence and smoothness of each process (oil phase recovery, viscous phase sewage discharge, transition layer treatment).

[0128] The oil recovery pipeline 6 enables unified recovery of the oil phase in both chambers, while the sewage discharge pipeline enables directional and closed-loop transportation of the viscous phase in the transition layer treatment chamber 12. The combination of the two makes the medium transportation and discharge of the unit more precise, avoiding oil phase loss and viscous phase accumulation. While improving the crude oil recovery rate, it also ensures the continuous and stable operation of the unit. At the same time, the unified oil recovery pipeline 6 and the dedicated sewage discharge pipeline simplify the on-site pipeline layout and reduce the difficulty of on-site installation and operation and maintenance.

[0129] The sewage discharge pipeline is located in the transition layer treatment chamber 12 and works in conjunction with the third sewage discharge port P3 to realize the closed-loop pipeline transportation of the viscous phase, avoiding leakage and secondary pollution of the viscous phase during transportation and improving the environmental friendliness of the unit. The added anti-blocking structure of the pipeline can effectively prevent the viscous phase from clogging the pipeline, ensuring the smoothness of sewage discharge and further improving the stability and reliability of the unit operation.

[0130] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device includes a thermal radiation coalescing electrode, which includes multiple heating tubes arranged in parallel to form a plate-shaped electrode or a blade-shaped electrode; or, the thermal radiation coalescing electrode includes at least one heating tube, which is arranged in a ring-shaped manner to form an annular electrode.

[0131] Exemplarily, the thermal radiation coalescing electrode includes at least one of the first thermal radiation coalescing electrode 2 and the second thermal radiation coalescing electrode 8 described above. The heating tube may be, for example, DN20, or may be other specifications. This is merely an illustrative example of some possible embodiments of the present disclosure and is not intended to limit the present disclosure.

[0132] For example, when the thermal radiation coalescing electrode includes multiple heating tubes, the multiple heating tubes can be directly fixed together by welding or other methods, or they can be fixed together by conductive connectors. Correspondingly, when the thermal radiation coalescing electrode includes one or more heating tubes (more than two here refers to two or more) arranged in a ring, the adjacent parts of the bent heating tubes can be directly fixed together by welding or other methods, or they can be fixed together by conductive connectors.

[0133] For example, the thermal radiation coalescing electrode described herein includes at least one of the first thermal radiation coalescing electrode 2 and the second thermal radiation coalescing electrode 8 mentioned above, which may be composed of a heating tube. The specific structure, shape, etc. of the thermal radiation coalescing electrode can be adaptively selected according to the cavity structure and processing requirements.

[0134] For example, the thermal radiation coalescing electrode can be a tubular plate-shaped or blade-shaped electrode. Specifically, the thermal radiation coalescing electrode can be a plate-shaped or blade-shaped structure formed by multiple heating tubes arranged side by side and closely. The edges of the blade-shaped electrode are sharpened to facilitate its cooperation with the first flat mesh demulsifying electrode 3 above it, generating a local high-intensity impact electric field to meet the processing requirements of the electro-demulsification core area.

[0135] When the inductive thermal radiation coalescence electrode is a blade electrode, a local extremely high electric field is easily generated between it and the first flat mesh demulsifying electrode 3 through the sharp edge of the blade electrode, which is beneficial for breaking down and weakening the stubborn oil-water interface film.

[0136] For example, the thermal radiation coalescing electrode can also be a ring electrode. Specifically, the thermal radiation coalescing electrode can be formed by at least one (one, two, or more) heating tubes arranged in a ring. The end of the outermost heating tube can be fixed to the side wall of the cavity (dehydration cavity 11 / transition layer treatment cavity 12) to form a closed or semi-closed ring structure, which can be adapted to circular or irregularly shaped cavities to achieve 360° circumferential thermal radiation heating.

[0137] The thermal radiation coalescing electrode can be plate-shaped, blade-shaped, or ring-shaped. The specific design can be flexibly selected based on the actual needs of the dehydration chamber 11 and the transition layer treatment chamber 12, such as the cross-sectional shape of the chamber being square, circular, or irregular, as well as the processing capacity and installation space. This greatly improves the customization capability and scenario adaptability of the wave-electric dual-field oilfield produced fluid treatment device, meeting the needs of complex chamber layouts and different treatment requirements.

[0138] Tubular plate / blade electrodes can be composed of one or more heating tubes arranged in parallel. The simultaneous operation of multiple heating tubes can significantly increase the thermal radiation area and heating efficiency of the electrode, enabling rapid heating of the produced fluid / transition layer and reducing the viscosity of the medium. At the same time, the densely arranged tube bundle surface provides a large number of coalescence points for dispersed phase water / oil droplets, promoting rapid coalescence of the dispersed phase, improving the preheating and coalescence effect, and laying the foundation for subsequent electro-demulsification.

[0139] The sharpened edge of the blade-shaped electrode works in conjunction with the flat mesh demulsifying electrode above (first flat mesh demulsifying electrode 3 / second flat mesh demulsifying electrode 9) to generate a local high-intensity, non-uniform pulsed electric field in the edge region of the blade-shaped electrode. This high-intensity electric field can instantly break down and weaken the stubborn oil-water interface film, and perform efficient and deep demulsification of the emulsion / transition layer. This solves the technical pain point of low and incomplete demulsification efficiency of traditional uniform electric fields for stubborn emulsions (such as ternary composite flooding produced fluid), and improves the core effect of electro-demulsification.

[0140] The annular electrode is formed by at least one heating tube, which is simple in structure and easy to install. It is suitable for small or irregularly shaped cavities and can achieve 360° heat radiation heating without dead angles in a limited space, ensuring full contact between the medium and the electrode and improving the uniformity of preheating and coalescence. At the same time, the annular structure will not significantly obstruct the flow of the medium, ensuring the smoothness of oil phase flotation and medium flow.

[0141] Regardless of the structural form, the thermal radiation coalescing electrode achieves an integrated design of heating tube and electrode, eliminating the need for separate heating and electrode structures. This simplifies the internal structural layout of the cavity, improves the integration of the device, reduces the number of parts, lowers the manufacturing cost and failure probability of the device, and facilitates later maintenance.

[0142] In some embodiments, the heating element is an induction heating element.

[0143] As a core component of the thermal radiation coalescing electrode (first thermal radiation coalescing electrode 2 / second thermal radiation coalescing electrode 8), the induction heating tube adopts the principle of electromagnetic induction heating. The tube body can be made of conductive metals such as stainless steel and copper, with an induction coil wound around the outside. After being energized, the surface of the tube body can generate a high temperature of over 250°C. The tube body has good conductivity and can be directly used as one pole of the electric field. It also has the characteristics of high pressure resistance, corrosion resistance, and high temperature resistance, making it suitable for the complex working conditions of oilfield produced fluids. It can be made into straight tubes and bent tubes, and is suitable for different electrode structures such as plate-shaped / blade-shaped and annular. The surface of the tube body can be coated with a high-temperature resistant thermally conductive coating to improve thermal radiation efficiency.

[0144] Based on the induction heating tube, the thermal radiation coalescence electrode integrates heating, coalescence, and electrode functions. Specifically, electromagnetic induction generates high temperatures on the surface of the metal tube, which heats the crude oil / transition layer through thermal radiation, reducing the viscosity of the medium. The densely arranged tube bundle surface provides a place for dispersed water / oil droplets to coalesce, grow, and merge, achieving mechanical coalescence. It pairs with the flat mesh demulsifying electrode above (first flat mesh demulsifying electrode 3 / second flat mesh demulsifying electrode 9) to form one pole of the impact electric field, participating in the electro-demulsification process.

[0145] For example, the thermal radiation coalescence electrode is located in the lower middle part of the impact electric field dehydration chamber 11 (dehydration chamber 11 / transition layer treatment chamber 12) (the core area where the incoming liquid first contacts).

[0146] The use of induction heating tubes enables the thermal radiation coalescing electrode to integrate heating, coalescing, and electrode functions into one. Compared with the traditional use of separate heating structures combined with separate electrode structures, it greatly simplifies the internal structure of the cavity, reduces the number of parts and installation space, improves the integration and space utilization of the device, and at the same time reduces the manufacturing cost and failure probability of the wave-electric dual-field oilfield produced fluid treatment device, making it easier for later maintenance and repair.

[0147] The induction heating tube uses electromagnetic induction heating, which is fast and efficient. The tube surface can quickly reach a high temperature of over 250°C. It heats crude oil / transition layer through thermal radiation, which can quickly reduce the viscosity of the medium (especially suitable for heavy oil and polymer flooding produced fluid), improve the fluidity of the dispersed phase, and promote its aggregation. At the same time, induction heating is flameless and heats uniformly, avoiding crude oil cracking and secondary emulsification caused by local overheating, and ensuring the stability of the medium properties.

[0148] The densely arranged tube bundle surface of the induction heating tubes provides a large number of mechanical coalescence points for the dispersed phase water / oil droplets. When the medium flows through the tube bundle surface, the dispersed phase will adhere, coalesce, and grow on the surface, achieving mechanical coalescence. This coalescence effect is superimposed on the coalescence effect of thermal radiation heating, which greatly improves the efficiency of initial coalescence. This results in a higher degree of coalescence of the dispersed phase before the medium enters the electric field for demulsification, laying a good foundation for subsequent deep electro-demulsification.

[0149] The induction heating tube has good conductivity and can be directly used as one pole of the electric field. It can be paired with the flat mesh demulsifying electrode above to form an impact electric field without the need for additional conductive connectors or electrode plates, thus reducing energy loss and ensuring the strength of the electric field.

[0150] Meanwhile, when the thermal radiation coalescence electrode is a blade-shaped electrode, the high-intensity local electric field generated by its sharp edge, together with the high temperature effect of induction heating, forms a thermo-electric synergistic demulsification. The high temperature reduces the strength of the interfacial film, and the high-intensity electric field breaks down the interfacial film. The synergistic effect of the two improves the demulsification effect significantly.

[0151] The thermal radiation coalescing electrode is located in the lower part of the cavity, which is the core area where the incoming liquid first contacts. After the medium enters the cavity, it immediately contacts the electrode of the induction heating tube, realizing continuous processing of instant heating, instant coalescence, and instant entry into the electric field for demulsification without process interruption. This improves the overall processing efficiency of the wave-electric dual-field oilfield produced fluid treatment device. At the same time, the high temperature resistance, corrosion resistance, and high pressure resistance of the induction heating tube enable it to adapt to the complex working conditions of high salt, high corrosion, and high pressure of oilfield produced fluid, extending the service life of the electrode and reducing the maintenance cost of the device.

[0152] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes: a first oil-water interface detection unit Y1, a second oil-water interface detection unit Y2, and a control system.

[0153] The first oil-water interface detection unit Y1 is located inside the dehydration chamber 11 and is used to detect the position of the oil-water interface inside the dehydration chamber 11. The second oil-water interface detection unit Y2 is located inside the transition layer processing chamber 12 and is used to detect the position of the oil-water interface inside the transition layer processing chamber 12.

[0154] The control system is used to adjust the intensity of the electric field in the dehydration chamber 11 according to the position of the oil-water interface in the dehydration chamber 11, and to adjust the intensity of the electric field in the transition layer treatment chamber 12 according to the position of the oil-water interface in the transition layer treatment chamber 12. The electric field in the dehydration chamber 11 includes a first demulsification electric field and a dehydration electric field, and the electric field in the transition layer treatment chamber 12 includes a second demulsification electric field.

[0155] The first oil-water interface detection unit Y1 is used to detect the position of the oil-water interface in the dehydration chamber 11 in real time, providing accurate data support for the control system to adjust the electric field strength. For example, the first oil-water interface detection unit Y1 can be an oil-water interface meter. Specifically, the first oil-water interface detection unit Y1 can be a radio frequency admittance oil-water interface meter, a float-type oil-water interface meter, or a capacitive oil-water interface meter, adaptable to the high-salt, high-viscosity, and solid-phase impurity-containing working environment of oilfield produced fluid treatment. Among them, the radio frequency admittance oil-water interface meter has strong anti-interference capability and can effectively avoid detection errors caused by the adhesion of solid-phase impurities.

[0156] For example, the specific location of the first oil-water interface detection unit Y1 corresponds to the transition layer formation area between the first flat mesh demulsifying electrode 3 and the flat mesh dehydrating electrode 4 within the dehydration chamber 11. The first oil-water interface detection unit Y1 can be positioned at a certain distance (e.g., 100mm-150mm) from the sidewall of the dehydration chamber 11. This avoids interference with electrodes, pipelines, and other structures, while accurately capturing the dynamic changes of the oil-water interface. The detection signal is transmitted to the control system in real time via a signal line.

[0157] The second oil-water interface detection unit Y2 is used to detect the position of the oil-water interface in the transition layer processing cavity 12 in real time, providing data for the control system to adjust the electric field strength in the transition layer processing cavity 12. For example, the second oil-water interface detection unit Y2 can also be an oil-water interface meter, specifically, it can be of the same type as the first oil-water interface detection unit Y1 (such as radio frequency admittance type) to ensure detection accuracy and consistency.

[0158] For example, the specific location of the second oil-water interface detection unit Y2 corresponds to the area below the ultrasonic processing unit, and it can maintain a certain distance (e.g., 100mm-150mm) from the side wall of the transition layer processing cavity 12, thereby avoiding the liquid outlet of the transition layer collection pipe and preventing detection fluctuations caused by the flow of the transition layer. The detection signal is also transmitted to the control system in real time to realize synchronous data acquisition with the first oil-water interface detection unit Y1.

[0159] The second thermal radiation coalescence electrode 8 and the second flat mesh demulsification electrode 9 are used to form a second demulsification electric field to perform deep demulsification treatment on the transition layer that is transported to the transition layer processing chamber 12 via the transition layer transfer component 5, thereby promoting the separation of oil, water and solid phases in the transition layer and laying the foundation for subsequent oil phase recovery and impurity and water phase discharge.

[0160] In conjunction with the preceding embodiments, the transition layer processing cavity 12 may contain one or more pairs of electrodes (e.g., a second thermal radiation coalescence electrode 8 and a second flat mesh demulsifying electrode 9 for forming the second demulsifying electric field). The electrodes may be made of conductive and corrosion-resistant materials such as stainless steel or copper, and their surfaces may be coated with an anti-scaling coating (e.g., a polytetrafluoroethylene coating) to prevent the adsorption of solid impurities and viscous substances in the transition layer, which could affect the uniformity of the second demulsifying electric field distribution. The spacing between the electrodes within the transition layer processing cavity 12 is adjustable, specifically according to the viscosity of the transition layer and processing requirements, to ensure the appropriate strength of the second demulsifying electric field.

[0161] For example, the electrodes in the transition layer processing cavity 12 are connected to an external power supply device, and the power supply voltage is adjustable, thereby realizing the adjustment of the second demulsification electric field strength to adapt to the demulsification requirements of the transition layer in different states.

[0162] As the core control hub of the wave-electric dual-field oilfield produced fluid treatment device, the control system is electrically connected to the first oil-water interface detection unit Y1, the second oil-water interface detection unit Y2, the electrode components in the transition layer treatment chamber 12 (such as the second thermal radiation coalescence electrode 8 and the second flat mesh demulsification electrode 9), and the electrode components in the dehydration chamber 11 (the first thermal radiation coalescence electrode 2, the first flat mesh demulsification electrode 3, and the flat mesh dehydration electrode 4), etc., to realize integrated control of signal acquisition, data analysis and command output.

[0163] For example, the control system can be a PLC control system. Furthermore, the control system can be equipped with a touchscreen operation panel, allowing on-site personnel to view various detection data and electric field strength parameters in real time, and to manually intervene and adjust them.

[0164] The control system has built-in preset control logic, which can automatically adjust the intensity of the first demulsification electric field (formed by the first thermal radiation coalescence electrode 2 and the first flat mesh demulsification electrode 3) and the dehydration electric field (formed by the first flat mesh demulsification electrode 3 and the flat mesh dehydration electrode 4) in the dehydration chamber 11 according to the oil-water interface position data transmitted by the first oil-water interface detection unit Y1. At the same time, it can automatically adjust the intensity of the second demulsification electric field in the transition layer processing chamber 12 according to the oil-water interface position data transmitted by the second oil-water interface detection unit Y2, thereby realizing dynamic adaptive adjustment of the electric field intensity.

[0165] The setup of the first / second oil-water interface detection unit enables real-time and accurate detection of the oil-water interface position in both chambers (dehydration chamber 11 and transition layer treatment chamber 12). This solves the technical pain point of traditional devices, which cannot grasp the dynamics of the oil-water interface in real time, leading to lag in electric field adjustment and unstable treatment results. The stability of the oil-water interface is a core prerequisite for electric field demulsification and oil-water separation. If the oil-water interface position shifts, it will cause changes in the contact area between the electrode and the medium, and uneven electric field distribution, thus affecting the demulsification and dehydration effect. The two detection units can capture changes in the interface position in real time, providing real-time data support for the control system, ensuring the timeliness and accuracy of electric field adjustment, and laying the foundation for subsequent adaptive adjustment of the electric field strength.

[0166] The second demulsifying electric field performs deep demulsification on the transition layer within the transition layer treatment chamber 12, achieving specialized and targeted treatment of the transition layer. This overcomes the shortcomings of traditional devices that only treat the dehydration chamber 11 with an electric field and lack effective demulsification methods for the transition layer. As a viscous phase composed of oil, water, and solid phases, the transition layer is difficult to separate effectively by gravity sedimentation alone. The second demulsifying electric field can break through the stubborn oil-water interface film within the transition layer, promoting the coalescence of tiny oil droplets and the sedimentation of the aqueous phase, thereby improving the recovery efficiency of the oil phase within the transition layer. At the same time, it reduces the viscosity of the transition layer, facilitating the subsequent discharge of impurities and the aqueous phase, and improving the overall treatment effect of the device.

[0167] The coordinated operation of the control system with the two oil-water interface detection units, the electrode assembly in the transition layer treatment chamber 12, and the electrode assembly in the dehydration chamber 11 enables dynamic adaptive adjustment of the electric field strength, breaking the limitation of the traditional device where the electric field strength is fixed and cannot be adjusted according to changes in operating conditions.

[0168] The control system adjusts the intensity of the first demulsification electric field and the dehydration electrode according to the position of the oil-water interface in the dehydration chamber 11. When the oil-water interface moves upward, it indicates that there is too much oil phase accumulation and demulsification is not timely. The control system automatically increases the electric field intensity to accelerate the demulsification and dehydration speed. When the oil-water interface moves downward, it indicates that there is too much water phase. The control system appropriately reduces the electric field intensity to avoid wasting electric field energy. At the same time, the control system adjusts the intensity of the second demulsification electric field according to the position of the oil-water interface in the transition layer treatment chamber 12 to ensure the stability of the demulsification effect of the transition layer and realize the closed-loop control of "detection-analysis-adjustment".

[0169] The establishment of the closed-loop control mode not only ensures the stability of the deep dehydration effect of the dehydration chamber 11 (e.g., crude oil water content ≤0.5%) and the treatment effect of the transition layer, but also realizes the rational utilization of electric field energy, reduces the energy consumption of the device, and avoids safety hazards such as electrode breakdown and medium splashing caused by excessively high electric field strength, or problems such as incomplete treatment and crude oil loss caused by excessively low electric field strength.

[0170] In addition, the touch screen operation panel of the PLC control system reduces the difficulty of operation for on-site staff, allowing them to complete daily operations and parameter viewing without the need for professional technicians, thus improving the ease of operation and reliability of the device.

[0171] In summary, the wave-electric dual-field oilfield produced fluid treatment device disclosed in some embodiments integrates crude oil demulsification and separation, transition layer collection, crushing, circulation and separation functions into the same device, with a compact structure; it can automatically adjust the electric field strength, ultrasonic power and thermal radiation intensity according to the properties of the produced fluid, thereby improving the system's automation level and operational reliability.

[0172] The synergistic effect of each functional structure enables the unit to form a complete processing system of "precise detection - adaptive adjustment - efficient processing", which not only improves the processing efficiency and accuracy of oilfield produced fluids, but also enhances the unit's adaptability to complex operating conditions. This ensures that the unit can maintain stable processing results under different processing loads and different transition layer production rates, providing reliable equipment support for the refined and efficient processing of oilfield produced fluids, while maximizing the recovery of crude oil resources and improving economic benefits.

[0173] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes an oil recovery pipeline 6, at least a portion of which is located within the housing 1 for recovering the separated crude oil.

[0174] For example, a portion of the oil receiving pipeline 6 is located within the dehydration chamber 11, and another portion is located within the transition layer processing chamber 12. The functional electrodes within the housing 1 are located on the side furthest from the mounting surface. These functional electrodes include a first thermal radiation coalescing electrode 2, a second thermal radiation coalescing electrode 8, a first flat-net demulsifying electrode 3, a second flat-net demulsifying electrode 9, and a flat-net dehydrating electrode 4.

[0175] At least a portion of the oil recovery pipeline 6 is located inside the housing 1, and is divided into a dehydration chamber 11 and a transition layer treatment chamber 12. The two pipelines are connected as a whole, and can simultaneously recover the crude oil separated from the two chambers. The pipeline portions inside the housing 1 are all located on the side of each functional electrode away from the mounting surface (i.e., the upper area of ​​the housing 1), which coincides with the final convergence area of ​​the oil phase rising.

[0176] Furthermore, the oil inlet of the oil receiving pipeline 6 can be equipped with a bell mouth or an oil collection tank to improve the crude oil collection efficiency, and the oil outlet extends to the outside of the box 1 to connect to the crude oil gathering and transportation system.

[0177] For example, the oil receiving line 6 can be made of oil-resistant and corrosion-resistant metal or plastic pipes to provide good sealing performance and prevent crude oil leakage.

[0178] The dehydration chamber 11 and the transition layer treatment chamber 12 of the oil recovery pipeline 6 can simultaneously collect the oil phase after deep dehydration in the dehydration chamber 11 and the oil phase separated and recovered in the transition layer treatment chamber 12, respectively, to achieve unified recovery of the oil phase in both chambers. This eliminates the need for two separate oil recovery structures, simplifies the overall structure of the device, reduces equipment manufacturing costs and on-site installation difficulties, and also reduces the number of pipelines and improves the integration of the device.

[0179] The portion of the oil collection pipeline 6 located inside the housing 1 is positioned above all the functional electrodes. This location is the final convergence area of ​​the oil phase floating inside the housing 1, matching the gravity-driven upward path of the oil phase. It can directly collect the upper pure oil phase after convergence, avoiding contact between the pipeline and the emulsion, water phase, or transition layer below, preventing secondary emulsification of the collected crude oil, and ensuring that the water content of the recovered crude oil meets the requirements.

[0180] Meanwhile, compared to an external oil collection structure, the oil collection pipeline 6 is at least partially located inside the housing 1, reducing the exposed area of ​​the pipeline, reducing heat loss of crude oil during transportation, preventing crude oil from adhering to the inner wall of the pipeline due to temperature drop and viscosity increase, ensuring the flowability of the oil collection pipeline 6, and reducing losses and environmental pollution caused by crude oil evaporation.

[0181] The configuration of the oil collection pipeline 6 enables immediate and continuous recovery of crude oil after separation, avoiding prolonged residence of the oil phase in the tank 1 and preventing the residual tiny water droplets in the oil phase from settling again due to excessive standing time, which would cause the water content to rise again. At the same time, it ensures that the oil level in the dehydration chamber 11 and the transition layer treatment chamber 12 is stable, providing a stable liquid level environment for the continuous floating and separation of the oil phase, and realizing continuous operation of oil phase collection.

[0182] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes at least two first drain outlets P1, which are disposed on the housing 1 and located on the side of the housing 1 facing the mounting surface. A portion of the at least two first drain outlets P1 communicates with the dehydration chamber 11, and another portion communicates with the transition layer treatment chamber 12; the at least two first drain outlets P1 are used to discharge the aqueous phase obtained from the separation of oilfield produced fluid.

[0183] For example, the first drain outlet P1 may be a circular or square (or other shapes, which are not limited in this disclosure) interface made of the same material as the housing 1, and shall have corrosion resistance and high pressure resistance. The first drain outlet P1 may be located on the housing 1 and on the side of the housing 1 facing the mounting surface (i.e., the bottom of the housing 1).

[0184] The number of first drain outlets P1 is at least two, wherein at least one first drain outlet P1 is connected to the dewatering chamber 11 and at least one first drain outlet P1 is connected to the transition layer treatment chamber 12.

[0185] Furthermore, each first sewage outlet P1 is equipped with a control valve such as a gate valve, ball valve, or butterfly valve, which can be independently opened, closed, and have its flow rate regulated. The sewage outlet is connected to an external water phase gathering and transportation pipeline, which is specifically used to discharge the water phase obtained from the separation of produced fluid from the oilfield.

[0186] The first drain outlet P1 is located at the bottom of the tank 1. The aqueous phase and some fine solid impurities after separation of the extracted liquid naturally settle to the bottom of the tank 1 under the action of gravity. The drain outlet is located at this position to realize the gravity flow discharge of the aqueous phase. There is no need to set up additional power equipment such as pumps, which reduces the energy consumption and operation and maintenance costs of the device, while ensuring the smooth discharge of the aqueous phase.

[0187] By setting at least two first drain outlets P1, which are respectively connected to the dewatering chamber 11 and the transition layer treatment chamber 12, independent drainage of the water phase in the two chambers is achieved. The drainage flow rate can be adjusted according to the sedimentation of the water phase in the two chambers, avoiding the problem of one chamber's water phase not being discharged in time, resulting in excessive liquid level, and the other chamber's water phase being discharged excessively, resulting in oil phase loss with the water phase when a single drain outlet discharges water in a unified manner. This improves the flexibility and accuracy of the drainage operation.

[0188] Each first discharge port P1 is equipped with an independent control valve, which allows for the maintenance and cleaning of a single discharge port during continuous operation of the device without stopping the entire device. This ensures continuous discharge and continuous treatment of the device and avoids the problem of needing to stop the machine for maintenance of a single discharge port, which would affect the treatment efficiency.

[0189] The water phases of the dehydration chamber 11 and the transition layer treatment chamber 12 are discharged independently, allowing for separate detection and control of the effluent quality of the two chambers. This facilitates timely detection of abnormal separation effects in a particular chamber (e.g., excessively high oil content in the effluent from the dehydration chamber 11 indicates poor demulsification and dehydration effects), enabling real-time monitoring of the device's operating status and troubleshooting, thereby improving the stability and reliability of the device's operation.

[0190] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes at least two second drain outlets P2, which are disposed on the housing 1 and located on the side of the housing 1 facing the mounting surface. A portion of the at least two second drain outlets P2 communicates with the dehydration chamber 11, and another portion communicates with the transition layer treatment chamber 12; the at least two second drain outlets P2 are used to discharge heavy impurities obtained from the separation of oilfield produced fluid.

[0191] For example, the second drain outlet P2 can be made of a thick-walled, corrosion-resistant, and wear-resistant material (e.g., the same material as the housing 1). The diameter of the second drain outlet P2 can be set to be larger than that of the first drain outlet P1 to accommodate the discharge requirements of heavy impurities.

[0192] The second drain outlet P2 is located on the housing 1 and on the side of the housing 1 facing the mounting surface (i.e., the bottom of the housing 1). Furthermore, the second drain outlet P2 can be arranged side by side with the first drain outlet P1.

[0193] There are at least two secondary sewage discharge outlets, with at least one secondary sewage discharge outlet P2 connected to the dewatering chamber 11 and at least one secondary sewage discharge outlet P2 connected to the transition layer treatment chamber 12. Furthermore, each secondary sewage discharge outlet P2 is equipped with a wear-resistant control valve and a blockage-clearing structure, and is externally connected to a solid waste collection pipeline, specifically for discharging heavy impurities (such as sand and mud) obtained from the separation of oilfield produced fluid.

[0194] The second discharge outlet P2 and the first discharge outlet P1 have a clear division of labor and work together. The first discharge outlet P1 is used to discharge the water phase with better flowability, while the second discharge outlet P2 is specifically used to discharge particulate and viscous heavy impurities. This achieves the separate discharge of water phase and heavy impurities, avoiding blockage of water phase pipelines and the first discharge outlet P1 when heavy impurities are discharged with the water phase, ensuring the smooth discharge of water phase, and facilitating the centralized collection, treatment and resource recovery of heavy impurities, which meets the requirements of oilfield environmental protection and refined treatment.

[0195] The second drain outlet P2 features a large-diameter design and can be equipped with a blockage-clearing structure, effectively adapting to the physical characteristics of heavy impurities and ensuring smooth discharge of these impurities. The selection of thick-walled, wear-resistant materials resists the erosion and wear of heavy impurities, extending the service life of the drain outlet and reducing maintenance costs and repair frequency.

[0196] Different second drain outlets P2 are connected to the dehydration chamber 11 and the transition layer treatment chamber 12 respectively, realizing the independent collection and discharge of heavy impurities in the two chambers. The discharge operation can be carried out according to the amount of impurities accumulated in the two chambers, avoiding the mixing of crude oil treatment impurities in the dehydration chamber 11 and viscous phase impurities in the transition layer treatment chamber 12. This facilitates the subsequent differentiated treatment of different types of impurities and improves the efficiency and professionalism of impurity treatment.

[0197] The second drain port P2 is located at the bottom of the tank 1, which can promptly discharge heavy impurities that have settled to the bottom of the tank 1, preventing impurities from accumulating at the bottom of the tank 1. This prevents accumulated impurities from raising the medium level at the bottom of the chamber, which would reduce the contact area between the functional electrodes, such as the first thermal radiation coalescence electrode 2, and the medium, thus reducing the processing efficiency. At the same time, it prevents impurities from adsorbing on the electrode surface, affecting the conductivity and thermal radiation coalescence effect of the electrodes, ensuring the working stability of each functional electrode, and indirectly improving the overall separation effect of the device.

[0198] In some embodiments, such as Figure 1 As shown, the wave-electric dual-field oilfield produced fluid treatment device also includes at least one third drain outlet P3, which is located on the box body 1 and communicates with the transition layer treatment chamber 12.

[0199] For example, the third drain outlet P3 is located on the side wall of the housing 1 in the direction of the arrangement of the transition layer treatment chamber 12 and the dewatering chamber 11, and is used to discharge the viscous phase separated after the transition layer is processed by the transition layer treatment component.

[0200] For example, the third drain outlet P3 can be made of a thick-walled, viscous, and corrosion-resistant material. The third drain outlet P3 is located on the side wall of the transition layer treatment chamber 12 and the dewatering chamber 11 in the arrangement direction of the chamber 1, that is, on the side wall corresponding to the partition of the two chambers, and its location corresponds to the settling area of ​​the viscous phase in the transition layer treatment chamber 12.

[0201] The third drain outlet P3 can be equipped with a wear-resistant control valve and a flow regulation structure. Its external connection is a viscous phase collection pipeline, which is used to discharge the viscous phase separated after the transition layer is processed by the transition layer treatment component.

[0202] The third drain outlet P3 is a specific drain outlet set for the transition layer treatment chamber 12, realizing the independent draining of the viscous phase after the transition layer treatment. It forms a three-class media classification draining system with the aqueous phase (first drain outlet P1) and heavy impurities (second drain outlet P2) obtained by separating the oilfield produced fluid. This avoids the mixing of different types of drain media, facilitates the special environmental protection treatment and resource recovery of the viscous phase, and meets the requirements of oilfield fine treatment.

[0203] The third drain outlet P3 is located on the side wall of the transition layer treatment chamber 12 and the dewatering chamber 11, corresponding to the viscous phase settling area. After the viscous phase settles into this area under gravity, it can be discharged by gravity without the need for additional power equipment, thus reducing the energy consumption of the device. At the same time, the side wall arrangement avoids spatial interference with the first and second drain outlets P2 at the bottom of the box 1, making the sewage discharge structure layout of the device more reasonable and improving the utilization rate of the space in the box 1.

[0204] The third drain outlet P3 can promptly discharge the viscous phase from the transition layer treatment chamber 12, preventing the viscous phase from accumulating in the transition layer treatment chamber 12, ensuring a stable liquid level in the transition layer treatment chamber 12, and keeping the transition layer treatment component at the optimal treatment liquid level, thus ensuring the efficiency of the transition layer treatment and the oil phase recovery effect; at the same time, it prevents the viscous phase from accumulating and adsorbing on the surface of the transition layer treatment component, affecting the working performance of the component, and extending the service life of the component.

[0205] The third drain outlet P3 is equipped with a flow regulation structure, which can precisely adjust the drain flow rate according to the processing capacity of the transition layer and the sedimentation amount of the viscous phase. This avoids excessive drain flow rate, which would cause the recovered oil phase to be lost with the viscous phase, or insufficient drain flow rate, which would cause the viscous phase to accumulate and block the pipeline. This achieves precise draining of the viscous phase, ensuring smooth draining while maximizing the crude oil recovery rate.

[0206] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes a demulsifier addition unit, the discharge port of which is connected to the dehydration chamber 11.

[0207] For example, the discharge port of the demulsifier addition unit may be connected to the liquid distribution pipeline J. Alternatively, the discharge port of the demulsifier addition unit may be located on the side of the liquid distribution pipeline J away from the mounting surface and adjacent to the liquid distribution pipeline J.

[0208] The demulsifier addition unit allows for precise and quantitative injection of a chemical demulsifier, matching the specific oilfield produced fluid, into the dehydration chamber 11. This ensures thorough mixing of the chemical demulsifier with the produced fluid before it enters the high-energy impact electric field treatment area. Through the synergistic effect of the high-energy impact electric field (such as the first demulsification electric field mentioned earlier) and the chemical demulsifier within the dehydration chamber, the chemical demulsifier specifically disrupts the stability of the crude oil emulsion film and reduces the viscosity of the emulsion system. Meanwhile, the high-energy impact electric field further breaks down the emulsion droplets through electric field force. This synergistic effect significantly improves crude oil demulsification efficiency and substantially reduces the emulsion oil content in the transition layer.

[0209] In some embodiments, the produced fluid includes shale oil produced fluid, heavy oil produced fluid, ternary composite flooding produced fluid, or polymer-containing flooding produced fluid.

[0210] Shale oil produced fluid is a mixture generated during shale oil extraction. Its core characteristics are high viscosity (e.g., viscosity of 50 Pa·s-500 mPa·s at 25°C), strong emulsification stability, a large number of fine shale particles (solid impurity particle size ≤50 μm), and large fluctuations in oil content, making demulsification and dehydration difficult. The wave-electric dual-field oilfield produced fluid treatment device provided in some embodiments of this disclosure effectively adapts to the high viscosity and strong emulsification characteristics of shale oil produced fluid, achieving efficient demulsification, dehydration, and solid impurity separation through preheating and viscosity reduction by the first thermal radiation coalescence electrode 2 in the dehydration chamber 11, deep demulsification by the first demulsification electric field, deep dehydration by the flat grid dehydration electrode 4, and targeted secondary demulsification by the second demulsification electric field.

[0211] The core characteristics of heavy oil produced fluid are extremely high crude oil viscosity (e.g., viscosity ≥ 1000 mPa·s at 25℃), high density, blurred oil-water interface, extremely strong emulsion stability, and the presence of a certain amount of asphaltenes and gums, which easily form scale on the electrode and pipeline surfaces, affecting the treatment effect. The first thermal radiation coalescing electrode 2 of the wave-electric dual-field oilfield produced fluid treatment device provided in some embodiments of this disclosure can raise the temperature of the heavy oil produced fluid to 60-80℃ through thermal radiation heating, significantly reducing its viscosity (viscosity reduction of more than 40%) and promoting emulsion demulsification; the anti-scaling coating on the electrode surface can effectively prevent the adsorption and formation of asphaltenes and gums, ensuring uniform electric field distribution; at the same time, through adaptive electric field adjustment of the control system, it can adapt to the blurred oil-water interface characteristics of heavy oil produced fluid, ensuring treatment accuracy.

[0212] Ternary composite flooding produced fluid is produced after oil recovery using ternary composite flooding technology involving alkali, surfactant, and polymer. Its core characteristics include complex emulsion types (mostly W / O or O / W mixed emulsions), extremely low interfacial tension, significant difficulty in demulsification, and the presence of a certain amount of polymer residue, which easily leads to viscous media and uniform dispersion of solid impurities. The wave-electric dual-field oilfield produced fluid treatment device provided in some embodiments of this disclosure utilizes the synergistic effect of a first demulsification electric field, a dehydration electrode, and a second demulsification electric field to effectively break down the interfacial films of different types of emulsions. Simultaneously, the preheating effect of the first thermal radiation coalescence electrode 2 can disrupt the stability of the polymer, promote the coalescence of tiny oil droplets, and achieve efficient demulsification and dehydration.

[0213] The core characteristic of polymer-flooded produced fluids is the presence of residual polymers (such as polyacrylamide), which leads to increased viscosity, enhanced emulsion stability, and easy adsorption of polymers on the electrode surface, affecting electrode conductivity and electric field effects. The anti-scaling coating on the electrode surface of the wave-electric dual-field oilfield produced fluid treatment device provided in some embodiments of this disclosure can effectively prevent polymer adsorption. Simultaneously, the preheating effect of the first thermal radiation coalescing electrode 2 can reduce polymer viscosity and minimize its interference with the demulsification process. The second demulsification electric field can specifically treat the polymer-containing transition layer, ensuring oil phase recovery efficiency and adapting to the treatment needs of polymer-flooded produced fluids.

[0214] The wave-electric dual-field oilfield produced fluid treatment device provided in some embodiments of this disclosure is applicable to, but is not limited to, the aforementioned oilfield produced fluids. The above is merely an illustrative description of some possible implementations of this disclosure and is not intended to limit the scope of this disclosure. It is understood that the wave-electric dual-field oilfield produced fluid treatment device provided in some embodiments of this disclosure is also applicable to other types of oilfield produced fluids.

[0215] The core structure of the wave-electric dual-field oilfield produced fluid treatment device provided in some embodiments of this disclosure (electrode assembly in dehydration chamber 11, electrode assembly in transition layer treatment chamber 12, ultrasonic treatment unit, and control system, etc.) is adapted to the characteristics of the oilfield produced fluid, such as high viscosity, strong emulsification, and impurity / polymer content. It can achieve efficient treatment of various types of oilfield produced fluid, greatly improving the applicability of the wave-electric dual-field oilfield produced fluid treatment device. It eliminates the need to design special devices for different types of produced fluid, reduces the equipment investment cost of oilfield produced fluid treatment, and improves the practicality and economy of the device.

[0216] To address the unique characteristics of produced fluids from different oilfields, the wave-electric dual-field oilfield produced fluid treatment devices provided in some embodiments of this disclosure can achieve optimal treatment results through adaptive adjustments to their own structures. For example, for high-viscosity shale oil and heavy oil produced fluids, preheating with the first thermal radiation coalescing electrode 2 reduces viscosity, and multi-stage electric field demulsification ensures efficient demulsification and dehydration. For complex ternary composite flooding produced fluids, the synergistic effect of the three-stage electric fields breaks down the interfacial films of different types of emulsions. For produced fluids containing polymers, anti-scaling coatings and preheating reduce polymer interference. This targeted adaptability ensures that the device can achieve deep dehydration and efficient oil phase recovery for various produced fluids, with stable and reliable treatment results.

[0217] In conjunction with the above, the wave-electric dual-field oilfield produced fluid treatment device of some embodiments of this disclosure can meet the actual treatment needs of oilfield sites, solve the problem of demulsification and dehydration of various difficult-to-treat produced fluids, avoid crude oil loss and environmental pollution caused by direct discharge of such produced fluids, improve the economic benefits of oilfields, meet environmental protection requirements, and have good industrial application prospects.

[0218] In some embodiments, the wave-electric dual-field oilfield produced fluid treatment device further includes an inductive thermal radiation power supply D1 and a focused dehydration power supply D2 located outside the housing 1. The inductive thermal radiation power supply D1 is connected to the aforementioned thermal radiation coalescing electrode (first / second thermal radiation coalescing electrode) and is used to supply power to the thermal radiation coalescing electrode; the focused dehydration power supply D2 is connected to the aforementioned flat-net demulsification electrode (first / second flat-net demulsification electrode) and flat-net dehydration electrode 4 and is used to supply power to the flat-net demulsification / dehydration electrode.

[0219] For example, the induction thermal radiation power supply D1 is located on the outside of the enclosure 1. It can be wall-mounted or floor-mounted. Its installation position is close to the wiring terminal of the thermal radiation coalescing electrode (first / second thermal radiation coalescing electrode), which facilitates the wiring and avoids contact with the medium inside the enclosure 1, as well as prevents corrosion and leakage, and is suitable for the high-salt and high-humidity working environment of the oilfield.

[0220] The inductive thermal radiation power supply D1 can be a dedicated high-frequency inductive power supply with overcurrent, overvoltage, and overheat protection functions, which can effectively prevent damage to the thermal radiation coalescing electrode due to power supply failure. It is connected to the first thermal radiation coalescing electrode 2 and the second thermal radiation coalescing electrode 8 mentioned above through high-temperature and high-voltage resistant insulated wires, respectively, using a parallel connection method. It can independently power the two thermal radiation coalescing electrodes, or power them simultaneously, ensuring that the thermal radiation coalescing electrodes can stably generate thermal radiation and meet the functional requirements of preheating coalescing.

[0221] For example, the energy-concentrating dehydration power supply D2 is located on the outside of the housing 1, and can be installed in parallel with the induction thermal radiation power supply D1 or separately on different side walls of the housing 1. The installation position of the energy-concentrating dehydration power supply D2 is close to the wiring terminals of the flat mesh demulsification electrode and the flat mesh dehydration electrode 4, which facilitates the wiring layout and subsequent maintenance.

[0222] The energy-concentrating dehydration power supply D2 can be a high-voltage DC power supply or a pulsed high-voltage power supply, such as a pulsed high-voltage power supply (which has higher demulsification efficiency). It has overcurrent, overvoltage, and short-circuit protection functions and is adaptable to the intensity adjustment requirements of various levels of demulsification and dehydration electric fields. It is connected to the first flat mesh demulsification electrode 3, the second flat mesh demulsification electrode 9, and the flat mesh dehydration electrode 4 mentioned above through high-voltage insulated wires, respectively, using a series connection method. According to the instructions of the control system, the supply voltage and frequency of each electrode can be adjusted synchronously or independently, thereby adjusting the intensity of the first demulsification electric field, the second demulsification electric field, and the dehydration electric field, providing stable power support for electro-demulsification and deep dehydration.

[0223] The separate setup of the induction thermal radiation power supply D1 and the energy-concentrating dehydration power supply D2 enables separate functions and dedicated power supply, avoiding the problems of unstable power supply and inability to accurately match the power supply needs of different electrodes caused by a single power supply powering all electrodes.

[0224] Meanwhile, the power supply requirements of the thermal radiation coalescence electrode (preheating coalescence function) and the flat mesh demulsification / dehydration electrode (electrodemulsification and dehydration function) are quite different (the former requires medium and low voltage and high power, while the latter requires high voltage and high frequency). The dedicated power supply can accurately match their respective power supply parameters to ensure that each electrode can stably perform its core functions, laying a stable power foundation for the subsequent preheating coalescence, electrodemulsification and deep dehydration processes.

[0225] Both the induction thermal radiation power supply D1 and the focused dehydration power supply D2 are located on the outside of the enclosure 1, away from the produced fluid and transition layer inside the enclosure 1. This effectively avoids short circuits and damage to the power supply caused by media corrosion and leakage. It also facilitates on-site maintenance and parameter adjustment by personnel without disassembling the enclosure 1, reducing maintenance difficulty and labor intensity, and improving the ease of operation and maintenance of the unit. Furthermore, the power supply's overcurrent, overvoltage, overheat, and short-circuit protection functions effectively prevent power supply failures and electrode damage, extending the service life of the power supply and electrodes, and reducing maintenance costs and downtime.

[0226] The induction thermal radiation power supply D1 has adjustable output voltage and power. It can flexibly adjust the thermal radiation intensity of the thermal radiation coalescing electrode according to the type (e.g., heavy oil, shale oil) and viscosity of the produced fluid, thereby regulating the preheating temperature of the produced fluid and adapting to the preheating and coalescing requirements of different produced fluids. For example, for heavy oil produced fluids with high viscosity, the power supply can be increased to enhance the thermal radiation intensity and accelerate viscosity reduction and coalescing; for ordinary produced fluids, the power supply can be reduced to save energy, achieving on-demand power supply and energy efficiency.

[0227] The energy-concentrating dehydration power supply D2 has adjustable output voltage and frequency and is linked with the control system. Based on data transmitted from the first and second oil-water interface detection units Y2 and in accordance with commands from the control system, it precisely adjusts the intensity of the first demulsification electric field, the second demulsification electric field, and the dehydration electric field, achieving adaptive adjustment of the electric field intensity. This linked adjustment capability ensures that the intensity of each electric field always matches the dynamic changes of the oil-water interface, guaranteeing both demulsification and dehydration effects while avoiding energy waste, further improving the processing stability and energy efficiency of the device.

[0228] The coordinated power supply of the induction thermal radiation power supply D1 and the energy-concentrating dehydration power supply D2, together with the thermal radiation coalescence electrode, the flat-grid demulsification / dehydration electrode, and the control system mentioned above, forms a complete "power supply-control-processing" system. This ensures that all core processing procedures of the device (preheating coalescence, deep demulsification, deep dehydration, and transition layer treatment) can operate stably and efficiently, indirectly improving the processing efficiency and accuracy of oilfield produced fluids, ensuring that the water content of crude oil meets expectations, and maximizing the recovery of crude oil resources.

[0229] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0230] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wave-electric dual-field oilfield produced fluid treatment device, characterized in that, include: The housing includes a dehydration chamber and a transition layer treatment chamber arranged side by side; The first thermal radiation coalescing electrode is disposed inside the dehydration chamber; The first thermal radiation coalescing electrode is used to radiate heat to the oilfield produced fluid flowing through the first thermal radiation coalescing electrode in order to promote the coalescence of the dispersed phase in the oilfield produced fluid. The first flat mesh demulsifying electrode is disposed in the dehydration chamber; the first flat mesh demulsifying electrode is located on the side of the first thermal radiation coalescing electrode away from the mounting surface of the wave-electric dual-field oilfield produced fluid treatment device, so as to form a first demulsifying electric field between the first thermal radiation coalescing electrode and the first flat mesh demulsifying electrode. A flat mesh dehydration electrode is disposed within the dehydration chamber; the flat mesh dehydration electrode is located on the side of the first flat mesh demulsifying electrode away from the first thermal radiation coalescence electrode, so as to form a dehydration electric field between the first flat mesh demulsifying electrode and the flat mesh dehydration electrode. A transition layer transfer assembly, located inside the housing, is used to transport the transition layer formed in the dehydration chamber to the transition layer processing chamber; An ultrasonic processing unit is located inside the transition layer processing cavity and is used to generate an ultrasonic cavitation field to act on the transition layer to separate the oil phase in the transition layer. Wherein, the mounting surface is parallel to the horizontal plane, or the mounting surface forms a first angle with the horizontal plane; the arrangement direction of the dehydration chamber and the transition layer treatment chamber is parallel to the mounting surface, or the arrangement direction of the dehydration chamber and the transition layer treatment chamber forms a second angle with the mounting surface.

2. The wave-electric dual-field oilfield produced fluid treatment device according to claim 1, characterized in that, The plane containing the first thermal radiation coalescing electrode intersects with the plane containing the mounting surface.

3. The wave-electric dual-field oilfield produced fluid treatment device according to claim 1, characterized in that, The oilfield produced fluid treatment device also includes: The liquid inlet is located on the box body and is connected to the dehydration chamber; A liquid distribution pipeline is located inside the dehydration chamber and communicates with the liquid inlet; the portion of the liquid distribution pipeline located inside the dehydration chamber is positioned between the first thermal radiation coalescence electrode and the flat mesh demulsification electrode.

4. The wave-electric dual-field oilfield produced fluid treatment device according to claim 3, characterized in that, The transition layer transfer component includes: The transition layer collection pipeline is located on the side of the liquid distribution pipeline near the mounting surface; the inlet end of the transition layer collection pipeline is connected to the dehydration chamber, and the outlet end of the transition layer collection pipeline is connected to the transition layer treatment chamber. The ultrasonic processing unit includes: An ultrasonic transducer is located on the side of the transition layer collection pipe near the mounting surface, and is adjacent to or in contact with the transition layer collection pipe; the ultrasonic waves are used to cavitate, break up, and disperse the transition layer that enters the transition layer processing cavity.

5. The wave-electric dual-field oilfield produced fluid treatment device according to claim 1, characterized in that, The first thermal radiation coalescing electrode includes multiple heating tubes, which are arranged in parallel to form a plate-shaped electrode or a blade-shaped electrode; or, The first thermal radiation coalescing electrode includes at least one heating tube, which is arranged in a ring to form an annular electrode.

6. The wave-electric dual-field oilfield produced fluid treatment device according to claim 1, characterized in that, The oilfield produced fluid treatment device also includes: The second thermal radiation coalescence electrode is disposed in the transition layer processing cavity and is used to radiate heat to the transition layer flowing through the second thermal radiation coalescence electrode to promote the coalescence of the dispersed phase in the transition layer. The second flat mesh demulsifying electrode is disposed in the transition layer processing cavity and located on the side of the second thermal radiation coalescing electrode away from the mounting surface, so as to form a second demulsifying electric field between the second thermal radiation coalescing electrode and the second flat mesh demulsifying electrode.

7. The wave-electric dual-field oilfield produced fluid treatment device according to claim 6, characterized in that, The second thermal radiation coalescing electrode includes multiple heating tubes arranged in parallel to form a plate-shaped electrode or a blade-shaped electrode; or, the second thermal radiation coalescing electrode includes at least one heating tube arranged in a ring-shaped manner to form an annular electrode.

8. The wave-electric dual-field oilfield produced fluid treatment device according to claim 7, characterized in that, The heating element is an induction heating element.

9. The wave-electric dual-field oilfield produced fluid treatment device according to claim 1, characterized in that, The oilfield produced fluid treatment device also includes: The first oil-water interface detection unit is located inside the dehydration chamber and is used to detect the position of the oil-water interface inside the dehydration chamber. The second oil-water interface detection unit is located inside the transition layer processing cavity and is used to detect the position of the oil-water interface inside the transition layer processing cavity. The second thermal radiation coalescence electrode and the second flat mesh demulsification electrode are disposed in the transition layer processing cavity to form a second demulsification electric field. The control system is used to adjust the intensity of the electric field in the dehydration chamber according to the position of the oil-water interface in the dehydration chamber, and to adjust the intensity of the electric field in the transition layer processing chamber according to the position of the oil-water interface in the transition layer processing chamber. The electric field within the dehydration chamber includes the first demulsification electric field and the dehydration electric field, while the electric field within the transition layer processing chamber includes the second demulsification electric field.

10. The wave-electric dual-field oilfield produced fluid treatment device according to claim 1, characterized in that, The oilfield produced fluids include shale oil produced fluids, heavy oil produced fluids, ternary composite flooding produced fluids, or polymer-containing flooding produced fluids.

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