Processing electret and electric demulsification separation unit and device using electret

Abstract

The invention discloses a processing electret, which is used for electric demulsification two-phase separation and at least comprises a first metal conductor component, a second metal conductor component and a third metal conductor component, the passive electrode is a flexible and ultrathin electret, and the passive electrode is adhered to at least one surface of the first metal conductor component and is used for forming an electric field and trapping and separating dispersed water drops in the oil-water emulsion; an insulating coating is arranged on the charge surface on one side of the passive electrode and used for preventing charge loss on the surface of the electret and further trapping and dispersing water drops. The invention also discloses an electric demulsification separation unit and device applying the processing electret. The electret material is processed and applied to electric demulsification two-phase separation in the petrochemical field, zero energy consumption can be achieved, and the electric demulsification separation efficiency can be remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation technology in petrochemicals, and particularly to an electro-demulsification separation unit and apparatus for processing electrets and applying the electrets. Background Technology

[0002] Two-phase separation is widely used in various industrial fields such as petroleum development, refining and chemical processing, and environmental protection. How to safely, simply, and efficiently separate oil-water, gas-liquid, gas-solid, and liquid-solid two-phase emulsions while minimizing energy consumption and carbon emissions has always been a focus of attention for industry professionals. Electrodemulsification is a highly efficient two-phase separation method with wide applications in oilfield produced fluid treatment, crude oil desalting and dehydration, and electrochemistry. Because water droplets and solid dust surfaces are easily polarized by an electric field, electrodemulsification is effective in separating water-in-oil emulsions, water mist, flue gas, and dust. However, the biggest problem with electrodemulsification is its high energy consumption. For large-scale continuous industrial production, maintaining a high-voltage electric field for extended periods requires a significant amount of energy.

[0003] For example, Chinese patent application CN113773873A discloses an electro-dehydration system for crude oil capable of processing intermediate layers, including an electro-dehydrator and a cyclone separator. Multiple horizontally distributed collection pipes are located in the middle of the electro-dehydrator, and each collection pipe is connected to an outlet pipe extending downwards from the electro-dehydrator. The outlet pipe drains the intermediate emulsion layer from the electro-dehydrator and connects to the inlet of the cyclone separator, where the cyclone separator further processes the intermediate emulsion layer. This system overcomes the drawbacks of conventional electro-dehydrators, such as reduced separation efficiency after a period of operation, excessive water content in the dehydrated oil, and frequent tripping, while retaining the advantages of electro-dehydrators, including high dehydration efficiency, large processing capacity, and convenient maintenance. However, this type of solution requires external power supply to the electrodes, such as using a rectangular wave AC power supply and powering the electrodes via wires, resulting in high energy consumption.

[0004] Electrets are flexible materials capable of carrying a charge for extended periods. They can be generated by fixing the charge onto a specific material surface through arc discharge, thus continuously producing a high-voltage electric field. Electrets are widely used in microphones, sensors, detectors, switches, and other devices; however, they have not yet been applied to large-scale industrial equipment.

[0005] Therefore, there is an urgent need for an electro-demulsification separation unit and device for processing electrets and applying them, which can process electret materials into passive electrodes and then construct a passive electro-demulsification separation unit to achieve zero-energy demulsification of water-in-oil emulsions by the electro-demulsification device.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide an electro-demulsification separation unit and apparatus for processing electret materials and applying them to the petrochemical field. By processing electret materials and applying them to electro-demulsification two-phase separation, not only can zero energy consumption be achieved, but the separation efficiency of electro-demulsification can also be significantly improved.

[0008] To achieve the above objectives, according to a first aspect of the present invention, the present invention provides a processed electret for electrolytic demulsification and two-phase separation, comprising at least: a first metal conductor member having a plate-like or mesh-like structure; a passive electrode having flexibility and ultrathin electret, the passive electrode being attached to at least one surface of the first metal conductor member for forming an electric field and capturing dispersed water droplets in the separated oil-water emulsion; an insulating coating is provided on the charged surface of one side of the passive electrode for preventing charge loss on the electret surface and further capturing dispersed water droplets.

[0009] Furthermore, in the above technical solution, the insulating coating is preferably made of hydrophilic epoxy resin or polymer material.

[0010] Furthermore, in the above technical solution, the first metal conductor component can be a metal plate, a sieve plate, a corrugated plate, or a metal mesh.

[0011] Furthermore, in the above technical solution, the non-charged surface on the other side of the passive electrode may be provided with an adhesive coating, which may be made of industrial adhesive material.

[0012] According to a second aspect of the present invention, the present invention provides an electro-demulsification separation unit, using any of the preceding electrets, comprising: a plurality of the processed electrets, which are arranged in parallel at intervals in an oil-water emulsion environment, and passive electrodes are provided on both opposite surfaces of the processed electrets; a plurality of second metal conductor members, none of which are attached with passive electrodes, the second metal conductor members being uniformly spaced from each processed electret to form an electric field between each processed electret and the adjacent second metal conductor member.

[0013] Furthermore, in the above technical solution, the metal skeleton composed of the processed electret and the second metal conductor component is connected and fixed by an insulating skeleton to ensure the preset distance between the processed electret and the second metal conductor component.

[0014] Furthermore, in the above technical solution, the second metal conductor component can be made of cast iron, brass, or alloy materials.

[0015] Furthermore, in the above technical solution, the oil-water emulsion can flow in the space between the processed electret and the second metal conductor component, and the flow direction is perpendicular to the electric field direction.

[0016] Furthermore, in the above technical solution, the oil-water emulsion can also flow in a direction perpendicular to the processing electret and the second metal conductor component. Correspondingly, the processing electret and the second metal conductor component have axially non-connected openings in the flow direction.

[0017] According to a third aspect of the present invention, the present invention provides an electro-demulsification separation device, which may be a tank or tower structure, and applies an electro-demulsification separation unit of any of the foregoing claims within the device.

[0018] Furthermore, in the above technical solution, when the tank is a horizontal tank, the tank is equipped with: a pre-separation module, which is located on one side of the tank, above the emulsion inlet; the separation unit used in the pre-separation module is vertically arranged, and the emulsion flows vertically upward in the pre-separation module; a main separation module, which is located in the middle of the tank, above the first outlet; the separation unit used in the main separation module is horizontally arranged, and the pre-separated emulsion flows horizontally in the main separation module; and an overflow plate is provided between the main separation module and the pre-separation module.

[0019] Furthermore, in the above technical solution, a deep separation module may also be provided inside the tank, which is located on the other side of the tank, above the second outlet; the separation unit used in the deep separation module is arranged horizontally, and the distance between the processed electret and the second metal conductor component is smaller than the corresponding distance of the main separation module, and the flow direction of the emulsion after the main separation in the deep separation module is horizontal; a baffle is provided between the deep separation module and the main separation module.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) This invention addresses the high energy consumption problem of existing electro-demulsification equipment that requires an external power supply. It creatively applies electrets to the electro-demulsification two-phase separation technology in the petrochemical field. By utilizing the characteristic that electrets can carry a charge for a long time and fix the charge on the surface of a specific material through arc discharge, the electrets are processed and modified to form processed electrets suitable for two-phase separation (especially oil-water separation), thereby achieving passive electro-demulsification. This invention eliminates the high-voltage power supply of existing electro-demulsification devices, which not only significantly reduces the energy consumption of the device but also saves device space and improves the safety of the device.

[0022] 2) The processed electret of the present invention uses an insulating coating. Since the insulating coating is mainly made of hydrophilic epoxy resin or polymer material, an insulating layer of a certain thickness is formed on the charged surface of the processed electret. On the one hand, it can prevent the surface of the processed electret from directly contacting the conductor (such as solid particles mixed in the oil-water emulsion) and causing charge loss. On the other hand, it can capture the dispersed water droplets in the oil-water emulsion under the action of the hydrophilic material, so that they aggregate and grow on the surface of the insulating coating, thereby separating them from the oil phase.

[0023] 3) This invention takes into account the flexibility and ultrathinness of electrets. By setting an adhesive coating on the non-charged surface, the passive electrode can be firmly bonded to different surfaces to construct processed electrets with different structural forms, thereby increasing the application scenarios of processed electrets.

[0024] 4) The metal conductor component used in the electro-demulsification separation unit of this invention can be a metal plate or a metal corrugated plate. The insulating frame ensures that the metal frames do not contact each other and maintains the preset distance between the processed electret and the second metal conductor component. The oil-water emulsion can flow in the space between the processed electret and the second metal conductor component, with the flow direction perpendicular to the electric field direction. Through the collision between dispersed water droplets and between dispersed water droplets and the processed electret, the tiny water droplets coalesce and grow into larger water droplets that are easier to detach, thereby achieving the purpose of efficient oil-water separation. When the metal conductor component is a metal corrugated plate, compared with the technical solution using a metal plate, it can not only effectively increase the coverage area of ​​the high-voltage electric field, but also facilitate the collision and coalescence of dispersed water droplets in different local directions, thereby effectively improving the two-phase separation efficiency.

[0025] 5) The metal conductor component used in the electro-demulsification separation unit of the present invention can also be a metal wire mesh. In this case, the processed electrets can be arranged in a dispersed manner. When a few of the processed electrets fail due to the breakage of the surface coating, the remaining processed electrets are not affected, and the overall oil-water separation effect is less affected, which can effectively extend the equipment maintenance cycle.

[0026] 6) The pre-separation module and main separation module arranged in different directions in the electro-demulsification separation device of the present invention, by arranging them vertically first and then horizontally, not only prolong the residence time of the oil-water emulsion in the high-voltage electric field and thus promote oil-water separation, but also the synergistic effect of the two modules changes the flow direction of the oil-water emulsion, further promoting the collision between dispersed water droplets. The collision generated by the conversion of different directions causes the tiny water droplets to coalesce and grow into larger water droplets that are easier to detach, thereby achieving the purpose of efficient oil-water separation. The use of the deep separation module makes the oil-water separation more thorough, and the proportion of water in the oil can be reduced to below 1%.

[0027] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other objects, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an existing primitive electret (showing the charge surface).

[0029] Figure 2 This is a schematic diagram of the passive electrode structure for processing electrets according to the present invention (showing the insulating coating and the adhesive coating).

[0030] Figure 3 This is a schematic diagram of the working principle of the electro-demulsification separation unit for processing electrets according to the present invention (showing a first embodiment in which the first and second metal conductor components are made of metal plates).

[0031] Figure 4 This is a schematic diagram of a second embodiment of the present invention in which the first and second metal conductor components adopt a metal corrugated plate.

[0032] Figure 5 This is a schematic diagram of a third embodiment of the first and second metal conductor components of the present invention using a metal sieve plate.

[0033] Figure 6 This is a schematic diagram of the fourth embodiment of the first and second metal conductor components of the present invention using metal wire mesh.

[0034] Figure 7 This is a schematic diagram of the structure (flat plate structure) of the first embodiment of the electro-demulsification separation unit of the present invention.

[0035] Figure 8 This is a schematic diagram of the structure of the second embodiment of the electro-demulsification separation unit of the present invention (corrugated plate structure).

[0036] Figure 9 This is a schematic diagram of one embodiment of the electro-demulsification and separation device of the present invention.

[0037] Explanation of key figure labels:

[0038] 1A-Original electret, 1-Passive electrode, 10-Processed electret, 11-Insulating coating, 12-Adhesive coating, 2-First metal conductor component, 20-Metal plate, 21-Opening, 30-Metal corrugated plate, 40-Metal wire mesh, 50-Insulating skeleton, 100-Electro-demulsification separation unit, 100A-Pre-separation module, 100B-Main separation module, 100C-Deep separation module, 200-Horizontal tank, 201-Emulsion inlet, 202-First outlet, 203-Overflow plate, 204-Second outlet, 205-Baffle plate, 206-Oil outlet. Detailed Implementation

[0039] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0040] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0041] In this document, for ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “above,” “upper,” etc., are used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that spatial relative terms are intended to encompass different orientations of an object in use or operation, in addition to those depicted in the figures. For example, if an object in the figure is flipped, an element described as “below” or “under” another element or feature would be oriented “above” that element or feature. Thus, the exemplary term “below” can encompass both the downward and upward orientations. An object may also have other orientations (rotated 90 degrees or other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0042] In this document, the terms "first," "second," etc., are used to distinguish two different elements or parts, and are not used to define specific positions or relative relationships. In other words, in some embodiments, the terms "first," "second," etc., can also be used interchangeably.

[0043] This invention addresses the high energy consumption problem of existing electro-demulsification equipment that requires an external power supply. It applies electrets to the two-phase separation technology of electro-demulsification in the petrochemical industry, utilizing the ability of electrets to maintain a charge for an extended period and fix the charge onto the surface of a specific material through arc discharge (see reference). Figure 1The original electret 1A structure (where the upper surface is a charged surface and the lower surface is a non-charged surface) allows the electret surface to continuously generate a high-voltage electric field. By processing and improving the electret, a processed electret suitable for two-phase separation (especially oil-water separation) can be formed. Based on the processed electret, a separation unit for electro-demulsification can be constructed and applied to various industrial environments (such as large-space tanks or towers such as separation tanks, purification tanks, buffer tanks, reaction towers, and extraction towers). This ensures that the charge of the processed electret remains stable for a long time without loss, thus providing a stable high-voltage electric field for a long time and achieving passive electro-demulsification.

[0044] Therefore, such as Figure 2 , 3 As shown, the present invention provides a processed electret for electrolytic demulsification and two-phase separation, comprising at least a first metal conductor component 2 and a passive electrode 1. The first metal conductor component 2 is a plate-like or mesh-like structure. Preferably, the first metal conductor component 2 is a metal plate (see reference). Figure 3 and Figure 7 ), sieve plate (reference) Figure 5 Corrugated sheet (reference) Figure 4 and Figure 8 ) or metal mesh (reference) Figure 6 The passive electrode 1 is a flexible and ultra-thin electret, and is attached to at least one surface of the first metal conductor component 2 (see reference). Figure 3 The diagram illustrates the bonding of the material to the upper and lower surfaces of the first metal conductor component 2, forming electric fields in the directions of the upward and downward arrows, respectively. This is used to create a high-voltage electric field and capture and separate dispersed water droplets in the oil-water emulsion. Further, as shown... Figure 2 As shown, an insulating coating 11 is provided on the charged surface of one side of the passive electrode 1. The thickness of the insulating coating is preferably 10 to 1000 micrometers, which is used to prevent charge loss on the electret surface and to further capture the dispersed water droplets. Considering the flexibility and ultra-thinness of the electret, an adhesive coating 12 can be provided on the non-charged surface of the passive electrode 1. The adhesive coating 12 can be made of commonly used industrial adhesive materials, which can enable the passive electrode 1 to be firmly bonded to different surfaces (such as the surface of the aforementioned first metal conductor component 2), thereby increasing the application scenarios of the passive electrode.

[0045] The present invention bonds a passive electrode 1 with an insulating coating 11 to a first metal conductor member 2 to construct a processed electret 10 (see reference). Figure 3The electret 10 generates a high-voltage electric field, causing dispersed water droplets in the oil-water emulsion to move and aggregate in the direction of the electric field. Since the insulating coating primarily uses hydrophilic epoxy resin or polymer materials, a certain thickness of insulating layer is formed on the charged surface of the electret 10. This prevents direct contact between the surface of the electret 10 and conductors (such as solid particles embedded in the oil-water emulsion) causing charge loss. Furthermore, it traps dispersed water droplets in the oil-water emulsion, causing them to aggregate and grow on the surface of the insulating coating 11, thus separating them from the oil phase. In this way, passive electro-demulsification can be achieved, and the oil-water separation efficiency can be effectively improved.

[0046] like Figure 3 , 7 As shown in Figure 8, the present invention also provides an electro-demulsification separation unit 100, which is an internal component installed in the tank or tower of an electro-demulsification device using the aforementioned processed electret 10. The electro-demulsification separation unit 100 includes multiple processed electrets 10 and multiple second metal conductor components. The multiple processed electrets 10 are arranged in parallel and spaced apart in an oil-water emulsion environment, and passive electrodes 1 are provided on both opposite surfaces of the processed electrets 10. Multiple second metal conductor components (e.g., ...) Figure 3 , 7 Metal plate 20 or Figure 4 , Figure 8 The metal corrugated plates in the first metal conductor component 2 can all use the same material (e.g., cast iron, brass or alloy conductor materials) and the same size, and the passive electrode 1 is not attached. The second metal conductor component is evenly spaced from each processed electret 10 to form an electric field between each processed electret 10 and the adjacent second metal conductor component.

[0047] Further as Figure 7 , 8 As shown, the electret 10 and the second metal conductor component (e.g.) are processed. Figure 7 Metal plate 20 or Figure 8The metal skeleton (corrugated metal plate 30) is connected and fixed by an insulating skeleton 50. The insulating skeleton material can be any insulating material with sufficient strength. The insulating skeleton 50 ensures that the metal skeletons do not contact each other and maintains a predetermined distance between the processed electret 10 and the second metal conductor component. By maintaining a certain predetermined distance, the oil-water emulsion can flow in the space between the processed electret 10 and the second metal conductor component, with the flow direction perpendicular to the electric field direction. When the oil-water two-phase emulsion flows through these space intervals of the electro-demulsification separation unit 100, the dispersed phase (i.e., dispersed water droplets) is affected by the high-voltage electric field, and its internal charge becomes polarized. The dispersed phase undergoes directional shift. Through collisions between dispersed water droplets and between dispersed water droplets and the processed electret 10, the tiny water droplets coalesce and grow into larger water droplets that are easier to detach, thereby achieving the purpose of efficient oil-water separation. When the second metal conductor component adopts a metal corrugated plate 30, compared with the technical solution of using a metal flat plate 20, it can not only effectively increase the coverage area of ​​the high voltage electric field, but also be more conducive to dispersing the collision and aggregation of water droplets in different local directions, thereby effectively improving the two-phase separation efficiency.

[0048] Further as Figure 5 As shown, the metal conductor component of the present invention can also be a metal sieve plate (see reference). Figure 5 That is, an opening 21 (i.e., an axially non-connected opening) is provided on the metal plate 20, and the processed electret 10 of the present invention is attached to the non-opening part. With this arrangement, the oil-water emulsion can flow in a direction perpendicular to the processed electret 10 and the second metal conductor component (i.e., through the opening part), thus achieving the purpose of oil-water two-phase separation. Further as... Figure 6 As shown, the metal conductor component of the present invention can also adopt a metal wire mesh structure (see reference). Figure 6 Since the metal mesh 40 itself has a hollow structure, the processed electret 10 of the present invention can be pasted and fixed at the intersection nodes of the mesh. The oil-water emulsion can also flow in a direction perpendicular to the processed electret 10 and the second metal conductor component (i.e., through the hollow parts), thus achieving the purpose of oil-water two-phase separation. In addition, by using the metal mesh 40 as the metal conductor component, the processed electret 10 can be arranged in a dispersed manner. When some processed electrets fail due to surface coating breakage, the remaining processed electrets are not affected, and the impact on the overall oil-water separation effect is small, which can effectively extend the equipment maintenance cycle.

[0049] like Figure 9As shown, the present invention also provides an electro-demulsification separation device, which can be a tank or a tower structure, and applies the aforementioned electro-demulsification separation unit within the device. The tank can be a large-space tank such as a separation tank, purification tank, or buffer tank, or a large-space tower such as a reaction tower or extraction tower. The electro-demulsification separation unit 100 can be arranged vertically and / or horizontally according to the different tank or tower diameters and process requirements.

[0050] The following is based on Figure 9 Taking a horizontal tank 200 as an example, when the tank is horizontal, a pre-separation module 100A (i.e., the electro-demulsification separation unit 100 of the present invention is arranged vertically) and a main separation module (i.e., the electro-demulsification separation unit 100 of the present invention is arranged horizontally) can be installed inside the tank. The pre-separation module 100A is located on one side inside the tank 200 (i.e.,... Figure 9 The space above the emulsion inlet 201 (left side of the tank 200). The electro-demulsification separation unit used in the pre-separation module 100A is vertically arranged, and the emulsion flows vertically upward in the pre-separation module 100A. The main separation module 100B is located in the middle of the tank 200, above the first outlet 202. The electro-demulsification separation unit used in the main separation module 100B is horizontally arranged, and the pre-separated emulsion flows horizontally in the main separation module 100B. An overflow plate 203 is installed between the main separation module 100B and the pre-separation module 100A. Manholes are provided on both sides of the tank 200 for maintenance and repair after shutdown; an oil outlet 206 is provided on the top of the tank.

[0051] The oil-water emulsion raw material flows into the tank 200 from the emulsion inlet 201 and flows from bottom to top through the pretreatment module 100A. During the flow through the pretreatment module, some dispersed water droplets migrate laterally under the action of the processing electret. Under the combined action of the charged surface of the processing electret and the insulating coating, they agglomerate and grow. Large droplets leave the pretreatment module 100A with the liquid flow. The oil-water emulsion leaving the pretreatment module crosses the overflow plate 203 and enters the central main area of ​​the device. When flowing through the main separation module 100B, the dispersed water droplets are accelerated to migrate vertically under the action of gravity and the vertical electric field force of the processing electret, causing a large number of dispersed water droplets to agglomerate and be removed. The removed aqueous phase is deposited at the bottom of the tank 200 to form a continuous aqueous phase layer, and finally discharged from the first outlet 202.

[0052] Further as Figure 9 As shown, preferably but not limitingly, a deep separation module 100C may also be provided inside the tank 200, the deep separation module being located on the other side inside the tank 200 (i.e., Figure 9The space above the second outlet 204 (right side of the main separation module 100C). The electro-demulsification separation unit used in the deep separation module 100C is arranged horizontally, and the distance between the processed electret and the second metal conductor component is smaller than the corresponding distance of the main separation module (i.e., forming a stronger high-voltage electric field). The flow direction of the emulsion after main separation in the deep separation module 100C is horizontal. A baffle 205 is provided between the deep separation module 100C and the main separation module 100B.

[0053] The upper oil phase, after most of the water has been removed by the main separation module 100B, crosses the baffle 205 and enters the rear of the tank 200. Since the rear of the tank is equipped with a more densely arranged deep separation module 100C, the oil-phase-dominated emulsion can be deeply separated. The oil phase after the final deep separation is discharged from the oil outlet 206, and the separated water phase is discharged from the second water outlet 204.

[0054] The pre-separation module and main separation module arranged in different directions in the electro-demulsification separation device of this invention, through the arrangement of vertical first and then horizontal, not only prolong the residence time of the oil-water emulsion in the high-voltage electric field and thus promote oil-water separation, but also the synergistic effect of the two modules changes the flow direction of the oil-water emulsion, further promoting the collision between dispersed water droplets. The collisions generated by the conversion of different directions cause the tiny water droplets to coalesce and grow into larger water droplets that are easier to detach, thereby achieving the purpose of efficient oil-water separation. The use of the deep separation module makes the oil-water separation more thorough, and the proportion of water in the oil can be reduced to below 1%.

[0055] Example 1

[0056] The viscosity of produced oil from a certain oilfield is 100 mPa·s at 60℃. The produced oil contains 30%-40% emulsified water, requiring treatment to reduce the water content to below 1%. The produced oil is pumped into the passive electro-demulsification separator of this invention using on-site oilfield pumps (the feedstock actually resides in the passive electro-demulsification separator for 1 hour). The feedstock oil enters the device through the emulsion inlet, and after passing through the pre-separation module and the main separation module, the water content of the crude oil decreases to below 3%. After processing by the deep separation module, the crude oil exiting the device is sampled and tested; the water content is approximately 0.8%, meeting the separation requirements.

[0057] Example 2

[0058] The produced fluid from a certain oilfield has a strength of 20 mPa·s at 40°C and a total water content of approximately 60%. Due to long-term water injection development, the produced fluid contains a large amount of solid sand particles, which may damage the insulating coating on the surface of the processed electret of this invention during long-term high-speed flow, causing charge loss and resulting in electret failure. This embodiment uses... Figure 6The metal wire mesh shown serves as a metal conductor component, and the processed electrets are arranged in a dispersed manner. When several processed electrets fail due to the breakage of the surface coating, the remaining processed electrets are not affected, and the overall oil-water separation effect is minimally affected.

[0059] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. Any simple modifications, equivalent changes, and alterations made to the foregoing exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A method for processing electrets, characterized in that, Used for electro-demulsification and two-phase separation, including: The first metallic conductor component is a plate-shaped or mesh-shaped structure; A passive electrode, which is a flexible and ultra-thin electret, is attached to at least one surface of the first metal conductor member to form an electric field and capture dispersed water droplets in the oil-water emulsion; an insulating coating is provided on the charged surface of one side of the passive electrode to prevent charge loss on the electret surface and to further capture the dispersed water droplets.

2. The processed electret according to claim 1, characterized in that, The insulating coating is made of hydrophilic epoxy resin or polymer material.

3. The processed electret according to claim 1, characterized in that, The first metal conductor component is a metal plate, a sieve plate, a corrugated plate, or a metal mesh.

4. The processed electret according to claim 1, characterized in that, The non-charged surface on the other side of the passive electrode is provided with an adhesive coating, which is made of industrial adhesive material.

5. An electro-demulsification separation unit, characterized in that, The application of the processed electret as described in any one of claims 1 to 4 includes: Multiple processed electrets are arranged in parallel at intervals in an oil-water emulsion environment, and passive electrodes are provided on both opposite surfaces of the processed electrets. The second metal conductor component, which is multiple in number and none of which is attached to the passive electrode, is evenly spaced from each of the processed electrets to form an electric field between each processed electret and the adjacent second metal conductor component.

6. The electro-demulsification separation unit according to claim 5, characterized in that, The metal frame consisting of the processed electret and the second metal conductor component is connected and fixed by an insulating frame to ensure a preset distance between the processed electret and the second metal conductor component.

7. The electro-demulsification separation unit according to claim 5, characterized in that, The second metal conductor component is made of cast iron, brass, or an alloy.

8. The electro-demulsification separation unit according to claim 6, characterized in that, The oil-water emulsion flows in the space between the processed electret and the second metal conductor component, and the flow direction is perpendicular to the direction of the electric field.

9. The electro-demulsification separation unit according to claim 6, characterized in that, The oil-water emulsion flows in a direction perpendicular to the processing electret and the second metal conductor component. Correspondingly, the processing electret and the second metal conductor component have axially non-connected openings in the flow direction.

10. An electro-demulsification and separation device, characterized in that, The device is a tank or tower structure, and a separation unit as described in any one of claims 5 to 9 is applied within the device.

11. The electro-demulsification and separation device according to claim 10, characterized in that, When the tank is a horizontal tank, the following are installed inside the tank: A pre-separation module is disposed on one side of the tank, above the emulsion inlet; the separation unit used in the pre-separation module is vertically arranged, and the emulsion flows vertically upward in the pre-separation module; The main separation module is located in the middle of the tank body, above the first outlet. The separation unit used in the main separation module is arranged horizontally, and the flow direction of the pre-separated emulsion in the main separation module is horizontal; an overflow plate is provided between the main separation module and the pre-separation module.

12. The electro-demulsification and separation device according to claim 11, characterized in that, The tank body is also equipped with: A deep separation module is disposed on the other side of the tank, above the second outlet; the separation unit used in the deep separation module is arranged horizontally, and the distance between the processed electret and the second metal conductor component is smaller than the corresponding distance of the main separation module; the emulsion after main separation flows horizontally in the deep separation module; a baffle is disposed between the deep separation module and the main separation module.

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