Electrode assembly for electric field demulsification of crude oil emulsions and separator

Abstract

The application provides a crude oil emulsion electric field demulsification electrode assembly and separator, relates to the oil-water separation technical field, and solves the technical problem of low separation efficiency of the conventional three-phase separator or oil-water separator in the prior art. The device comprises a tubular insulating electrode, a metal plate-shaped electrode, a lower support frame, an upper support frame and a wire assembly. The tubular insulating electrode and the metal plate-shaped electrode are located between the lower support frame and the upper support frame. The two ends of the metal plate-shaped electrode are respectively connected with the lower support frame and the upper support frame. The lower end of the tubular insulating electrode is connected with the lower support frame. The wire assembly is installed on the upper end surface of the upper support frame. The upper end of the tubular insulating electrode penetrates through the upper support frame and is electrically connected with the wire assembly. The wire assembly is electrically connected with the high-voltage pole of an alternating-current power supply. The metal plate-shaped electrode is electrically connected with the grounding pole of the alternating-current power supply.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation technology, and in particular to an electric field demulsification electrode assembly and separator for crude oil emulsion. Background Technology

[0002] Currently, in the treatment of produced fluids from oil wells, both domestically and internationally, oilfields typically first use high- and low-pressure three-phase separators or oil-water separators for multiphase separation. Crude oil with a water content below 30% then enters an electrostatic precipitator (ESP), where, under the influence of an electric field, the water content is further reduced to below a certain threshold to meet the requirements for crude oil export. However, as most oilfields enter the later stages of production, the water content of produced fluids from oil wells continuously increases, sometimes reaching as high as 95%. Simultaneously, the application of enhanced oil recovery (EOR) technologies, such as tertiary oil recovery, has led to severe degradation of crude oil quality, more complex and stable crude oil emulsions, resulting in reduced separation efficiency of conventional three-phase separators or oil-water separators. Consequently, the water content of the crude oil entering the downstream ESP is too high, rendering the ESP malfunction. Summary of the Invention

[0003] The purpose of this invention is to provide an electric field demulsification electrode assembly and separator for crude oil emulsions, thereby solving the technical problem of low separation efficiency in conventional three-phase separators or oil-water separators in the prior art. 。 The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention provides an electric field demulsification electrode assembly for crude oil emulsion, comprising a tubular insulating electrode, a metal plate electrode, a lower support frame, an upper support frame, and a wire assembly. The tubular insulating electrode and the metal plate electrode are located between the lower support frame and the upper support frame. Both ends of the metal plate electrode are connected to the lower support frame and the upper support frame, respectively. The lower end of the tubular insulating electrode is connected to the lower support frame. The wire assembly is mounted on the upper surface of the upper support frame. The upper end of the tubular insulating electrode passes through the upper support frame and is electrically connected to the wire assembly. The wire assembly is electrically connected to the high-voltage electrode of an AC power supply, and the metal plate electrode is electrically connected to the ground electrode of the AC power supply.

[0006] Optionally, there may be multiple tubular insulating electrodes, and all the tubular insulating electrodes are staggered along the length of the lower support frame.

[0007] Optionally, the tubular insulating electrode includes an inner insulating layer, a middle metal spiral strip, and an outer insulating layer. The middle metal spiral strip is located between the inner insulating layer and the outer insulating layer. The inner insulating layer and the middle metal spiral strip, as well as the outer insulating layer and the middle metal spiral strip, are connected by hot melt adhesive. The upper end of the middle metal spiral strip is connected to the wire assembly.

[0008] Optionally, the lower end of the tubular insulating electrode is provided with a sealing structure, and a fixed base is provided on the lower support frame, with the sealing structure connected to the fixed base.

[0009] Optionally, there are multiple metal plate electrodes, two adjacent metal plate electrodes are arranged in a figure-eight shape, and the tubular insulating electrode is located at the large opening end of the two adjacent metal plate electrodes.

[0010] Optionally, the metal plate electrode is a flat plate structure or a corrugated plate structure, and both the lower support frame and the upper support frame are provided with grooves, into which the end of the metal plate electrode is inserted.

[0011] Optionally, the conductor assembly includes a sealing box, a cable, a sealing connector, and a hub. The sealing box is mounted on the upper end face of the upper support frame. The sealing connector is located inside the sealing box and connected to the upper support frame. One end of the hub is connected to the sealing box. The cable is located inside the hub and the sealing box. The upper outer wall of the tubular insulated electrode passes through the upper support frame and is connected to the sealing connector. The middle metal spiral band of the tubular insulated electrode is electrically connected to one end of the cable. The other end of the cable is electrically connected to the high-voltage electrode of the AC power supply.

[0012] The present invention provides a separator comprising a tank, an AC power supply, and a crude oil emulsion electric field demulsification electrode assembly. The crude oil emulsion electric field demulsification electrode assembly is built into the tank, and the AC power supply is located outside the tank. The tubular insulated electrode and the metal plate electrode in the crude oil emulsion electric field demulsification electrode assembly are electrically connected to the high voltage electrode and the ground electrode of the AC power supply, respectively.

[0013] Optionally, it also includes a baffle and a support frame, the bottom of the crude oil emulsion electric field demulsification electrode assembly is connected to the support frame, the support frame is connected to the inner wall of the tank, the baffle is located on one side of the crude oil emulsion electric field demulsification electrode assembly, and the baffle is provided with multiple flow holes.

[0014] Optionally, the number of crude oil emulsion electric field demulsification electrode assemblies is at least two, the length direction of the crude oil emulsion electric field demulsification electrode assemblies is consistent with the radial direction of the tank body, and all the crude oil emulsion electric field demulsification electrode assemblies are distributed along the axial direction of the tank body.

[0015] This invention provides an electric field demulsification electrode assembly for crude oil emulsions, integrated within a three-phase separator or oil-water separator. A tubular insulated electrode is connected to an AC power source as a high-voltage electrode, while a grounded metal plate electrode serves as a low-voltage electrode. This creates a non-uniform high-frequency / high-voltage pulsed AC electric field between the tubular insulated electrode and the metal plate electrode. This field induces turbulence and cylindrical disturbances in the crude oil emulsion as it flows through these electrodes. Under the influence of the electric field, small dispersed droplets in the crude oil emulsion deform, move, and collide with each other, coalescing into larger droplets. These larger droplets then settle to the lower end of the three-phase separator or oil-water separator under gravity, while the continuous oil phase rises to the upper end. This achieves demulsification and oil-water separation of the crude oil emulsion, improving separation efficiency and solving the technical problem of low separation efficiency in conventional three-phase separators or oil-water separators. 。 Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a crude oil emulsion electric field demulsification electrode assembly provided in an embodiment of the present invention;

[0018] Figure 2 This is a partial structural schematic diagram of an electric field demulsification electrode assembly for crude oil emulsion provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the tubular insulated electrode and the metal plate electrode of a crude oil emulsion electric field demulsification electrode assembly provided in an embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of a tubular insulated electrode of a crude oil emulsion electric field demulsification electrode assembly provided in an embodiment of the present invention;

[0021] Figure 5 This is a top view of the lower support frame of a crude oil emulsion electric field demulsification electrode assembly provided in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the forward arrangement of an electric field demulsification electrode assembly for crude oil emulsion provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the reverse arrangement of an electric field demulsification electrode assembly for crude oil emulsion provided in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of a separator provided in an embodiment of the present invention;

[0025] Figure 9 This is a cross-sectional view of a separator provided in an embodiment of the present invention.

[0026] In the diagram: 1. Tubular insulating electrode; 11. Inner insulating layer; 12. Middle metal spiral strip; 13. Outer insulating layer;

[0027] 2. Metal plate electrode;

[0028] 3. Lower support frame; 31. Fixed base; 32. Groove;

[0029] 4. Upper support frame;

[0030] 5. Wire assembly; 51. Sealing box; 52. Cable; 53. Sealing connector; 54. Conduit; 541. Conduit box; 542. Vertical conduit; 543. Horizontal conduit; 5431. Plug; 544. Extension conduit;

[0031] 6. AC power supply;

[0032] 7. Tank body;

[0033] 8. Baffle;

[0034] 9. Supporting frame. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] This invention provides an electric field demulsification electrode assembly for crude oil emulsion, comprising a tubular insulated electrode 1, a metal plate electrode 2, a lower support frame 3, an upper support frame 4, and a wire assembly 5. The tubular insulated electrode 1 and the metal plate electrode 2 are located between the lower support frame 3 and the upper support frame 4. Both ends of the metal plate electrode 2 are connected to the lower support frame 3 and the upper support frame 4, respectively. The lower end of the tubular insulated electrode 1 is connected to the lower support frame 3. The wire assembly 5 is mounted on the upper surface of the upper support frame 4. The upper end of the tubular insulated electrode 1 passes through the upper support frame 4 and is electrically connected to the wire assembly 5. The wire assembly 5 is electrically connected to the high-voltage electrode of an AC power supply 6, and the metal plate electrode 2 is electrically connected to the grounding electrode of the AC power supply 6. The AC power supply 6 is a high-frequency, high-voltage pulse AC power supply. This invention provides an electric field demulsification electrode assembly for crude oil emulsion, which is built into a three-phase separator or oil-water separator. A tubular insulated electrode 1 is connected to an AC power supply 6 as a high-voltage electrode, and a metal plate electrode 2 is grounded as a low-voltage electrode. This creates a non-uniform high-frequency / high-voltage pulsed AC electric field between the tubular insulated electrode 1 and the metal plate electrode 2. This causes turbulence and cylindrical disturbances in the crude oil emulsion as it flows through the tubular insulated electrode 1 and the metal plate electrode 2. Under the action of the electric field, small droplets of the dispersed phase in the crude oil emulsion deform, move, and collide with each other to aggregate into large droplets. The large droplets settle to the lower end of the three-phase separator or oil-water separator under the action of gravity, while the continuous oil phase floats to the upper end of the three-phase separator or oil-water separator. This achieves demulsification and oil-water separation of the crude oil emulsion, improves the separation efficiency, and solves the technical problem of low separation efficiency in conventional three-phase separators or oil-water separators in the prior art.

[0039] As an optional implementation, there are multiple tubular insulating electrodes 1, and all tubular insulating electrodes 1 are staggered along the length direction of the lower support frame 3.

[0040] As an optional embodiment, the tubular insulated electrode 1 includes an inner insulating layer 11, a middle metal spiral strip 12, and an outer insulating layer 13. The middle metal spiral strip 12 is located between the inner insulating layer 11 and the outer insulating layer 13. The inner insulating layer 11 and the middle metal spiral strip 12, as well as the outer insulating layer 13 and the middle metal spiral strip 12, are connected by hot melt adhesive. The hot melt adhesive is formed by high-temperature and high-pressure extrusion. The upper end of the middle metal spiral strip 12 is connected to the wire assembly 5. The tubular insulated electrode 1 has advantages such as good plasticity, high temperature resistance, corrosion resistance, light weight, and long service life. The material used for the middle metal spiral strip 12 can be aluminum alloy, and the materials used for the inner insulating layer 11 and the outer insulating layer 13 can be insulating materials such as polyethylene.

[0041] As an optional implementation, the lower end of the tubular insulating electrode 1 is provided with a sealing structure to seal the intermediate metal spiral strip 12. A fixed base 31 is provided on the lower support frame 3, and the sealing structure is connected to the fixed base 31 in a sealed connection.

[0042] As an optional implementation, multiple metal plate electrodes 2 are used, with adjacent metal plate electrodes 2 arranged in a figure-eight pattern. A certain channel for fluid flow is left between adjacent metal plate electrodes 2, and the tubular insulating electrode 1 is located at the large opening end of the adjacent metal plate electrodes 2, forming a non-uniform electric field between them. The metal plate electrodes 2 can be made of stainless steel or alloy steel, and the included angle between adjacent metal plate electrodes 2 can be 45°, 60°, 90°, 120°, etc. To ensure suitable electric field conditions between the tubular insulating electrode 1 and the metal plate electrodes 2, and to generate appropriate turbulence in the crude oil emulsion, the ratio of the vertical distance between the tubular insulating electrode 1 and the metal plate electrodes 2 to the diameter of the tubular insulating electrode 1 is approximately 1.2. Simultaneously, by adjusting the electric field parameters of the external AC power supply 6, reasonable electric field strength, pulse frequency, duty cycle, etc., can be applied to fully utilize the synergistic enhancement of the demulsification effect by the flow field and electric field.

[0043] As an optional implementation, the metal plate electrode 2 has a flat plate structure or a corrugated plate structure, and both the lower support frame 3 and the upper support frame 4 are provided with grooves 32. The end of the metal plate electrode 2 is inserted into the groove 32 and fixed.

[0044] As an optional implementation, the conductor assembly 5 includes a sealing box 51, a cable 52, a sealing connector 53, and a hub 54. The sealing box 51 is mounted on the upper end face of the upper support frame 4. The sealing connector 53 is located inside the sealing box 51 and is connected to the upper support frame 4. One end of the hub 54 is connected to the sealing box 51. The cable 52 is located inside the hub 54 and the sealing box 51 to protect the cable 52. The upper outer wall of the tubular insulating electrode 1 passes through the upper support frame 4 and is connected to the sealing connector 53. The outer wall of the outer insulation layer 13 passes through the upper support frame 4 and is threadedly sealed to the sealing connector 53. The middle metal spiral strip 12 of the tubular insulating electrode 1 is electrically connected to one end of the cable 52, and the other end of the cable 52 is electrically connected to the high voltage electrode of the AC power supply 6. The hub 54 is for the neat arrangement of all cables. When there is only one crude oil emulsion electric field demulsification electrode assembly in the tank 7, the hub 54 includes a hub box 541 and a vertical pipe 542. The hub box 541 is located in the sealed box 51. The top of the hub box 541 is connected to one end of the vertical pipe 542. The vertical pipe 542 extends out of the sealed box 51 and the tank 7. All cables 52 in the sealed box 51 extend into the hub box 541 and then pass through the vertical pipe 542 and are electrically connected to the high voltage electrode of the AC power supply 6.

[0045] When tank 7 has two or more crude oil emulsion electric field demulsification electrode assemblies, the manifold 54 includes a manifold box 541, a vertical pipe 542, a horizontal pipe 543, and an extension pipe 544. The manifold box 541 is located in the sealed box 51. The top of the manifold box 541 is connected to one end of the vertical pipe 542, which extends out of the sealed box 51. The free ends of all vertical pipes 542 are connected to the side wall of the horizontal pipe 543. One end of the extension pipe 544 is connected to the side wall of the horizontal pipe 543, and the other end of the extension pipe 544 extends out of tank 7. All cables 52 in the sealed box 51 pass sequentially through the manifold box 541, the vertical pipe 542, the horizontal pipe 543, and the extension pipe 544 and are electrically connected to the high-voltage electrode of the AC power supply 6. A plug 5431 is provided at the end of the horizontal pipe 543.

[0046] This invention provides a separator, including a tank 7, an AC power supply 6, and a crude oil emulsion electric field demulsification electrode assembly. The crude oil emulsion electric field demulsification electrode assembly is built into the tank 7, which is horizontally positioned. The crude oil emulsion electric field demulsification electrode assembly is located at the oil-water emulsion layer within the tank 7. The AC power supply 6 is located outside the tank 7. The tubular insulated electrode 1 and the metal plate electrode 2 of the crude oil emulsion electric field demulsification electrode assembly are electrically connected to the high-voltage electrode and the grounding electrode of the AC power supply 6, respectively. The AC power supply 6 is a high-frequency, high-voltage pulse AC power supply. The wall of the tank 7 is grounded.

[0047] As an optional implementation, it also includes a baffle 8 and a support frame 9. The bottom of the crude oil emulsion electric field demulsification electrode assembly is connected to the support frame 9, and the support frame 9 is connected to the inner wall of the tank 7. The connection can be welded. The baffle 8 is located on one side of the crude oil emulsion electric field demulsification electrode assembly. The baffle 8 is provided with multiple flow holes. The function of the baffle 8 is to allow the fluid, especially the fluid in the emulsion layer, to pass through the crude oil emulsion electric field demulsification electrode assembly.

[0048] As an optional implementation, the crude oil emulsion electric field demulsification electrode assembly can be arranged in a single layer inside the tank 7; or the number of crude oil emulsion electric field demulsification electrode assemblies is at least two, the length direction of the crude oil emulsion electric field demulsification electrode assembly is consistent with the radial direction of the tank 7, and all crude oil emulsion electric field demulsification electrode assemblies are distributed along the axial direction of the tank 7. There are two electrode arrangement methods between two adjacent crude oil emulsion electric field demulsification electrode assemblies: one is forward arrangement, that is, the arrangement of individual figure-eight plate-shaped electrode units in the two rows of electrodes is exactly the same and is located at the same horizontal position. The "large opening end" of the two metal plate-shaped electrodes 2 in the first row of electrodes is opposite to the "small opening end" of the two metal plate-shaped electrodes 2 in the second row of electrodes;

[0049] Another arrangement is a reverse arrangement, where the "large opening ends" of the two metal plate electrodes 2 in the first row are opposite to the "large opening ends" of the two metal plate electrodes 2 in the second row. These two electrode arrangements result in different flow states of the fluid between the electrodes.

[0050] The working principle of the separator of this invention is as follows: Crude oil emulsion enters from one side of the crude oil emulsion electric field demulsification electrode assembly and passes through the flow channel formed between the high-voltage tubular insulated electrode 1 and the metal plate electrode 2. The emulsion first flows through the low-voltage metal plate electrode 2, which is placed in a figure-eight shape. Due to the influence of the structure of the low-voltage metal plate electrode 2, a certain turbulence is formed. Then, under the action of the non-uniform high-frequency / high-voltage pulsed AC electric field between the high-voltage tubular insulated electrode 1 and the grounded metal plate electrode 2, the small droplets of the dispersed phase in the crude oil emulsion deform, move, and collide with each other under the action of the electric field force, and agglomerate into large droplets. The large droplets settle to the lower end of the tank under the action of gravity, while the continuous oil phase floats to the upper end of the tank, thereby realizing the demulsification and oil-water separation of the crude oil emulsion. The demulsification and dehydration effect can be enhanced by adjusting the electric field parameters of the external high-frequency / high-voltage pulsed AC power supply, applying reasonable electric field strength, pulse frequency, duty cycle, etc., and utilizing the synergistic effect of the flow field and electric field.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A crude oil emulsion electric field demulsification electrode assembly, characterized in that, It includes a tubular insulated electrode (1), a metal plate electrode (2), a lower support frame (3), an upper support frame (4), and a wire assembly (5), wherein, The tubular insulating electrode (1) and the metal plate electrode (2) are located between the lower support frame (3) and the upper support frame (4). The two ends of the metal plate electrode (2) are connected to the lower support frame (3) and the upper support frame (4) respectively. The lower end of the tubular insulating electrode (1) is connected to the lower support frame (3). The wire assembly (5) is installed on the upper end face of the upper support frame (4). The upper end of the tubular insulating electrode (1) passes through the upper support frame (4) and is electrically connected to the wire assembly (5). The wire assembly (5) is electrically connected to the high voltage electrode of the AC power supply (6). The metal plate electrode (2) is electrically connected to the ground electrode of the AC power supply (6). The number of the metal plate electrodes (2) is multiple, and two adjacent metal plate electrodes (2) are arranged in a figure-eight shape, and the tubular insulating electrode (1) is located at the large opening end of the two adjacent metal plate electrodes (2); There are multiple tubular insulating electrodes (1), and all the tubular insulating electrodes (1) are staggered along the length direction of the lower support frame (3).

2. The crude oil emulsion electric field demulsification electrode assembly according to claim 1, characterized in that, The tubular insulating electrode (1) includes an inner insulating layer (11), a middle metal spiral strip (12) and an outer insulating layer (13). The middle metal spiral strip (12) is located between the inner insulating layer (11) and the outer insulating layer (13). The inner insulating layer (11) and the middle metal spiral strip (12) and the outer insulating layer (13) and the middle metal spiral strip (12) are connected by hot melt adhesive. The upper end of the middle metal spiral strip (12) is connected to the wire assembly (5).

3. The crude oil emulsion electric field demulsification electrode assembly according to claim 2, characterized in that, The lower end of the tubular insulating electrode (1) is provided with a sealing structure, and a fixed base (31) is provided on the lower support frame (3), and the sealing structure is connected to the fixed base (31).

4. The crude oil emulsion electric field demulsification electrode assembly according to claim 1, characterized in that, The metal plate electrode (2) is a flat plate structure or a corrugated plate structure. Both the lower support frame (3) and the upper support frame (4) are provided with grooves (32). The end of the metal plate electrode (2) is inserted into the groove (32).

5. The crude oil emulsion electric field demulsification electrode assembly according to claim 1, characterized in that, The conductor assembly (5) includes a sealing box (51), a cable (52), a sealing connector (53), and a hub (54). The sealing box (51) is installed on the upper end face of the upper support frame (4). The sealing connector (53) is located inside the sealing box (51) and is connected to the upper support frame (4). One end of the hub (54) is connected to the sealing box (51). The cable (52) is located inside the hub (54) and the sealing box (51). The upper outer wall of the tubular insulating electrode (1) passes through the upper support frame (4) and is connected to the sealing connector (53). The middle metal spiral strip (12) of the tubular insulating electrode (1) is electrically connected to one end of the cable (52). The other end of the cable (52) is electrically connected to the high voltage electrode of the AC power supply (6).

6. A separator, characterized in that, The assembly includes a tank (7), an AC power supply (6), and a crude oil emulsion electric field demulsification electrode assembly as described in any one of claims 1-5. The crude oil emulsion electric field demulsification electrode assembly is built inside the tank (7), and the AC power supply (6) is located outside the tank (7). The tubular insulated electrode (1) and the metal plate electrode (2) in the crude oil emulsion electric field demulsification electrode assembly are electrically connected to the high voltage electrode and the grounding electrode of the AC power supply (6), respectively.

7. The separator according to claim 6, characterized in that, It also includes a baffle (8) and a support frame (9). The bottom of the crude oil emulsion electric field demulsification electrode assembly is connected to the support frame (9). The support frame (9) is connected to the inner wall of the tank (7). The baffle (8) is located on one side of the crude oil emulsion electric field demulsification electrode assembly. The baffle (8) is provided with multiple flow holes.

8. The separator according to claim 7, characterized in that, The number of crude oil emulsion electric field demulsification electrode assemblies is at least two. The length direction of the crude oil emulsion electric field demulsification electrode assemblies is consistent with the radial direction of the tank body (7). All the crude oil emulsion electric field demulsification electrode assemblies are distributed along the axial direction of the tank body (7).

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