Parallel tubular multi-frequency electric field enhanced coalescer and method

Abstract

The invention discloses a parallel tubular multi-frequency electric field enhanced coalescer and method. The coalescer comprises an inlet manifold system, a parallel tubular coalescence unit, an integrated high-voltage power supply system and an outlet manifold system which are sequentially communicated from bottom to top, the inlet manifold system comprises a manifold inlet and inlet pipes at all levels, the parallel tubular coalescence unit comprises tubular coalescence units at all levels, the inlet pipes at all levels are sequentially connected with one ends of the tubular coalescence units at all levels, and the outlet manifold system comprises a manifold outlet and outlet pipes at all levels. The other end of each stage of tubular coalescence unit is sequentially connected with each stage of outlet pipe respectively; and the integrated high-voltage power supply system is electrically connected with the parallel tubular coalescence unit. The problems that traditional equipment is large in occupied area, complex in structure, small in treatment capacity and the like are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-water separation in oil fields, and in particular to a parallel-tube multi-frequency electric field enhanced coalescer and a method thereof. Background Art

[0002] As oilfield development enters a phase of high water content and high emulsification, crude oil dehydration becomes a critical step in ensuring crude oil quality and meeting transportation and refining requirements. Crude oil dehydration technology aims to remove water from crude oil and improve its quality, forming a crucial foundation for subsequent oil production processes.

[0003] Traditional separation technology primarily relies on physical and chemical methods such as gravity settling and chemical demulsification, forming a technical system based on graded treatment. Gravity settling is used to initially separate the oil and water, followed by chemical agents to break the emulsion structure, and finally, an electric field is used to accelerate droplet coalescence.

[0004] Traditional gravity sedimentation technology is subject to the limitations of the physical laws of Stokes' law, and has the defect of low oil-water separation efficiency when dehydrating highly emulsified crude oil. Tiny droplets are difficult to effectively coalesce due to the stability of the interfacial film, resulting in an exponential increase in sedimentation time. In order to improve the efficiency of oil-water separation, the existing technology often requires the use of a large amount of chemical demulsifiers. This method not only increases the actual operating costs, but also brings the risk of contaminating the quality of crude oil due to residual chemicals. This type of original dehydration method usually adopts a mode of multi-stage processing units operating in sequence, that is, the front-end unit achieves preliminary separation of oil and water through gravity sedimentation, the mid-end unit uses chemical agents to destroy the emulsified structure, and the terminal unit uses the action of an electric field to accelerate droplet aggregation.

[0005] As a terminal fine treatment method, the core problem of existing technologies for the electro-dehydration process is the lack of adaptability between the mechanism of action of the traditional industrial frequency electric field and the actual complex working conditions. Most existing electro-dehydration equipment adopts a bare electrode design. Due to the complex properties of oil and the enhanced conductivity, the electro-dehydration equipment frequently suffers from short-circuit failures. In addition, during long-term operation, it is easily affected by impurities such as solid particles, asphaltene, and salts in the produced fluid. A conductive deposit layer will form on the surface of the bare electrode, resulting in a serious distortion of the electric field distribution. This "fouling effect" not only reduces the electric field strength, but also triggers local arc discharge and even "field collapse" phenomena, resulting in the electro-dehydration equipment being unable to operate normally and stably. Especially for complex produced fluids with high water content, the conductivity fluctuation range of the oil-water emulsion is expanded, greatly increasing the risk of electric field instability.

[0006] The unique nature of offshore oil and gas development further exacerbates the shortcomings of existing technologies. Limited deck space on offshore production platforms makes it difficult to accommodate the multi-stage separation equipment required by existing technologies. Existing gravity settling tanks occupy a large footprint, significantly compromising the layout space for other production systems. The high humidity and salt spray environment of the ocean place stringent demands on the corrosion resistance of equipment materials, making conventional electric dehydration highly susceptible to "field collapse." Summary of the Invention

[0007] In response to the shortcomings of the existing technology, the present invention provides a parallel tube multi-frequency electric field enhanced agglomerator and method. In the present invention, the crude oil emulsion is evenly distributed to the agglomeration units at each level, and droplet agglomeration is achieved under the action of the multi-frequency enhanced electric field. After treatment, the droplets are concentrated and output to the sedimentation tank for gravity separation, realizing the single-point fault isolation function, thereby improving the processing efficiency and solving the problems of traditional equipment such as large footprint, complex structure, and small processing capacity.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a parallel-tube multi-frequency electric field enhanced coalescer, comprising: an inlet manifold system, a parallel-tube coalescing unit, an integrated high-voltage power supply system, and an outlet manifold system, which are sequentially connected from bottom to top; The inlet manifold system includes a manifold inlet and inlet pipes at each stage, the parallel tubular agglomeration unit includes inclined tubular agglomeration units at each stage, wherein the inlet pipes at each stage are respectively connected to one end of the tubular agglomeration units at each stage in sequence, the outlet manifold system includes a manifold outlet and outlet pipes at each stage, the other ends of the tubular agglomeration units at each stage are respectively connected to the outlet pipes at each stage in sequence; and the integrated high-voltage power supply system is electrically connected to the parallel tubular agglomeration units.

[0009] As a further technical solution, the inlet pipes at each stage include a first inlet pipe, a second inlet pipe and a third inlet pipe; the tubular agglomeration units at each stage include a first tubular agglomeration unit, a second tubular agglomeration unit and a third tubular agglomeration unit designed in parallel; the outlet pipes at each stage include a first outlet pipe, a second outlet pipe and a third outlet pipe.

[0010] As a further technical solution, the manifold inlet is connected to the crude oil emulsion, and the manifold outlet is connected to the gravity sedimentation tank; an inlet baffle is provided between the manifold inlet and the second inlet pipe to achieve uniform distribution of the inlet flow; and drain valves are respectively provided between the manifold inlet and the first inlet pipe and the third inlet pipe to achieve sand discharge.

[0011] As a further technical solution, the first tubular agglomeration unit, the second tubular agglomeration unit and the third tubular agglomeration unit are all arranged at an angle, and cylindrical insulating electrodes and fixed plates are provided in the first tubular agglomeration unit, the second tubular agglomeration unit and the third tubular agglomeration unit, and the fixed plates are connected to the cylindrical electrodes and the corresponding tubular agglomeration units of each stage through flanges.

[0012] As a further technical solution, the first tubular coalescing unit is connected to the second tubular coalescing unit through the first inlet pipe and the second inlet pipe using an integrated high-voltage line; the second tubular coalescing unit is connected to the third tubular coalescing unit through the second outlet pipe and the third outlet pipe using an integrated high-voltage line; the three-tubular coalescing unit is connected to the integrated high-voltage power supply system through the third inlet pipe using an integrated high-voltage line.

[0013] As a further technical solution, the first inlet pipe, the second inlet pipe and the third inlet pipe are respectively provided with a first inlet sampling valve, a second inlet sampling valve and a third inlet sampling valve, and the first inlet sampling valve, the second inlet sampling valve and the third inlet sampling valve are respectively close to the first tubular coalescing unit, the second tubular coalescing unit and the third tubular coalescing unit.

[0014] As a further technical solution, the first outlet pipe, the second outlet pipe and the third outlet pipe are respectively provided with a first outlet sampling valve, a second outlet sampling valve and a third outlet sampling valve, and the first outlet sampling valve, the second outlet sampling valve and the third outlet sampling valve are respectively close to the first tubular coalescing unit, the second tubular coalescing unit and the third tubular coalescing unit.

[0015] As a further technical solution, the integrated high-voltage power supply system includes a high-voltage power supply, a transformer and an integrated high-voltage line, and the transformer is connected to the high-voltage power supply via the integrated high-voltage line.

[0016] In a second aspect, the present invention provides a parallel-tube multi-frequency electric field enhanced coalescence method, based on a parallel-tube multi-frequency electric field enhanced coalescer according to any one of the first aspects, comprising: The crude oil emulsion enters the parallel tubular multi-frequency electric field enhanced coalescer through the manifold inlet. Under the action of the inlet baffle, the crude oil emulsion is distributed to the inlet pipes of each level and enters the corresponding tubular coalescing units of each level through the inlet pipes of each level for oil-water separation. Under the action of the multi-frequency electric field enhancement, the water droplets in the oil coalesce and settle, and then pass through the outlet pipes of each level and converge into the manifold outlet, and then enter the gravity sedimentation tank through the manifold outlet.

[0017] As a further technical solution, the method further includes: after the crude oil emulsion is distributed to the inlet pipes at each level, a first sampling result is obtained through the first inlet sampling valve, the second inlet sampling valve, and the third inlet sampling valve, and the water content in the oil at the inlet is calculated; a second sampling result is obtained through the first outlet sampling valve, the second outlet sampling valve, and the third outlet sampling valve, and the water content in the oil at the outlet is calculated.

[0018] One or more technical solutions of the present invention have the following beneficial effects: This invention utilizes a "divergent flow + multi-frequency electric field enhanced coalescence" process, employing three parallel tubular coalescing units. Powered by an integrated high-voltage power supply system, this generates a multi-frequency electric field within the units. This rapidly coalesces water droplets in the oil, improving oil-water separation efficiency and enabling centralized processing of highly water-rich crude oil. This process addresses the low separation efficiency of traditional gravity sedimentation technology for highly emulsified crude oil.

[0019] The present invention strictly limits the longitudinal height, as well as the overall length and width of the equipment, by arranging the various stages of tubular agglomeration units at an angle. This makes the parallel tubular multi-frequency electric field enhanced agglomerator smaller in overall size, compact in volume, easy to disassemble after skid mounting, and occupies little space. It is suitable for upgrading and renovating crude oil processing systems in the narrow space of offshore platforms, solving the problem of traditional multi-stage separation equipment occupying a large area and squeezing out the space of other production systems.

[0020] By using insulated high-voltage electrodes, this invention enables a high-voltage power supply with multiple independent outputs and overcurrent protection, as well as adjustable operating voltage and frequency. The insulating layer prevents short circuits caused by the accumulation of tiny sand particles and avoids electric field distortion caused by the formation of a conductive deposit layer on the electrode surface due to impurities, effectively preventing the "field collapse" phenomenon. This makes the dehydration equipment more stable and improves its adaptability to complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 Schematic diagram of the overall structure of the parallel-tube multi-frequency electric field enhanced coalescer of the present invention; Figure 2 Schematic diagram of the structure of the parallel tubular coalescing unit in the present invention; Figure 3 Schematic diagram of the structure of the inlet manifold system of the present invention; Figure 4 Schematic diagram of the structure of the outlet manifold system of the present invention; Among them, 1 is the manifold inlet, 2 is the drain valve, 3 is the inlet baffle, 4 is the first inlet pipe, 5 is the second inlet pipe, 6 is the third inlet pipe, 7 is the first inlet sampling valve, 8 is the second inlet sampling valve, 9 is the third inlet sampling valve, 10 is the integrated high-voltage power supply system, 11 is the first tubular coalescing unit, 12 is the second tubular coalescing unit, 13 is the third tubular coalescing unit, 14 is the cylindrical insulated electrode, 15 is the fixed plate, 16 is the first outlet sampling valve, 17 is the second outlet sampling valve, 18 is the third outlet sampling valve, 19 is the exhaust port, 20 is the first outlet pipe, 21 is the second outlet pipe, 22 is the third outlet pipe, and 23 is the manifold outlet. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Example 1 The present invention provides a parallel tube multi-frequency electric field enhanced coalescer, such as Figure 1 As shown, the system comprises: an inlet manifold system, parallel tubular coalescing units, an integrated high-voltage power supply system, and an outlet manifold system, connected sequentially from bottom to top. The inlet manifold system includes a manifold inlet 1 and inlet pipes at each stage. The parallel tubular coalescing units include tubular coalescing units at each stage, with each inlet pipe connected to one end of each tubular coalescing unit. The outlet manifold system includes a manifold outlet 23 and outlet pipes at each stage, with the other end of each tubular coalescing unit connected to the outlet pipes at each stage. The integrated high-voltage power supply system is electrically connected to the parallel tubular coalescing units. The manifold inlet is connected to crude oil emulsion, i.e., oilfield produced fluid, and the manifold outlet is connected to a gravity settling tank. The tank is made of duplex stainless steel and is 3.6 meters high.

[0027] In response to the problems of small processing capacity, uneven electric field coverage, poor anti-fluctuation ability, and low energy efficiency in the existing single-tube multi-frequency electric field enhanced coalescer oil-water separation technology, this embodiment provides three sets of parallel tubular multi-frequency electric field enhanced coalescers and simultaneously adopts high-capacity oil-water separation. It has the advantages of small size, easy disassembly due to skid mounting, compact and efficient operation, stable operation, and high efficiency. It effectively solves the problems of processing rigidity, difficulty in expansion, and easy damage existing in traditional electric dehydration equipment. On the other hand, this embodiment adopts the "diversion + multi-frequency electric field enhanced coalescing" process, powered by an integrated high-voltage power supply system and using cylindrical high-voltage electrodes with insulation layer protection, which can realize centralized crude oil processing. It has the advantages of high processing capacity flexibility and high isolation of single-point failures, and is suitable for high-water-content land and marine platforms in various environments.

[0028] In this embodiment, the inlet pipes at each stage include a first inlet pipe 4, a second inlet pipe 5 and a third inlet pipe 6, the tubular agglomeration units at each stage include a first tubular agglomeration unit 11, a second tubular agglomeration unit 12 and a third tubular agglomeration unit 13 designed in parallel, and the outlet pipes at each stage include a first outlet pipe 20, a second outlet pipe 21 and a third outlet pipe 22.

[0029] In this embodiment, the lower inlets of the first tubular coalescing unit 11, the second tubular coalescing unit 12 and the third tubular coalescing unit 13 are respectively connected to the first inlet pipe 4, the second inlet pipe 5 and the third inlet pipe 6 through flanges; the upper outlets of the first tubular coalescing unit 11, the second tubular coalescing unit 12 and the third tubular coalescing unit 13 are respectively connected to the first outlet pipe 20, the second outlet pipe 21 and the third outlet pipe 22 through flanges.

[0030] In this embodiment, the first, second, and third tubular coalescing units are all inclined. Specifically, the inclination angle does not exceed 40 degrees, the vertical height does not exceed 700 mm, the overall length does not exceed 7000 mm, and the overall width does not exceed 4000 mm. As the crude oil emulsion passes through the first, second, and third tubular coalescing units, the water particles therein coalesce under the action of the electric field, increasing their particle size. The crude oil emulsion continues to flow and enters the rear-end settling tank for further separation.

[0031] like Figure 2 As shown, the first, second, and third tubular coalescing units are each equipped with a cylindrical insulated electrode 14 and an insulating retaining plate 15. The insulating retaining plate connects the cylindrical insulated electrode to the corresponding tubular coalescing units via flanges. The central high-voltage electrode of the cylindrical insulated electrode 14 is made of stainless steel and coated with a polytetrafluoroethylene insulation layer. The retaining plate is embedded with an O-ring to ensure airtightness in the high-voltage area.

[0032] In this embodiment, the first tubular coalescing unit is connected to the second tubular coalescing unit via the first and second inlet pipes using an integrated high-voltage line. The second tubular coalescing unit is connected to the third tubular coalescing unit via the second and third outlet pipes using an integrated high-voltage line. The third tubular coalescing unit is connected to the integrated high-voltage power supply system 10 via the third inlet pipe using an integrated high-voltage line. The high-voltage power supply system adopts a high-frequency pulse design and has an overcurrent protection function. The operating voltage range of the high-voltage power supply system is 1 kV to 6 kV, and the operating frequency range is 1000 Hz to 20000 Hz. The integrated high-voltage power supply system includes a high-voltage power supply, a transformer, and an integrated high-voltage line. The transformer is connected to the high-voltage power supply via the integrated high-voltage line. The integrated high-voltage line is connected to the first high-voltage power supply with a diameter of 1.3m.

[0033] The crude oil dehydration process is based on the electric field polarization effect. Its core mechanism can be described as follows: when the water-containing crude oil flows through the non-uniform electric field formed by the high-voltage insulating electrode, the dispersed phase water droplets undergo dipole coalescence under the action of the alternating electric field force, and an attractive force is formed between adjacent droplets. (where is the dielectric constant of vacuum, is the relative dielectric constant of crude oil, is the droplet dielectric constant ratio, is the electric field strength, is the droplet radius, is the droplet spacing), which causes the droplets to arrange into a chain structure along the electric field lines and collide.

[0034] In this embodiment, if Figure 3 As shown, an inlet baffle 3 is provided between the manifold inlet 1 and the second inlet pipe 5 to achieve uniform distribution of the inlet flow. The inlet baffle 3 is made of 416L stainless steel with a thickness of 13 mm and a polished surface to reduce flow resistance.

[0035] In this embodiment, if Figure 3 As shown, drain valves are provided between the manifold inlet 1 and the first inlet pipe and the third inlet pipe, respectively, for draining sewage and sand.

[0036] In this embodiment, if Figure 3 As shown, the first inlet pipe 4, the second inlet pipe 5 and the third inlet pipe 6 are respectively provided with a first inlet sampling valve 7, a second inlet sampling valve 8 and a third inlet sampling valve 9, and the first inlet sampling valve 7, the second inlet sampling valve 8 and the third inlet sampling valve 9 are respectively close to the lower ends of the first tubular coalescing unit 11, the second tubular coalescing unit 12 and the third tubular coalescing unit 13.

[0037] In this embodiment, if Figure 4As shown, exhaust ports 19 are provided on the first outlet pipe 20 , the second outlet pipe 21 and the third outlet pipe 22 and close to the outlets of the tubular coalescing units at each stage, and the gas in the parallel tubular multi-frequency electric field enhanced coalescer is discharged from the exhaust ports 19 .

[0038] like Figure 4 As shown, first outlet pipe 20, second outlet pipe 21, and third outlet pipe 22 are respectively provided with first outlet sampling valve 16, second outlet sampling valve 17, and third outlet sampling valve 18. These valves are located near the upper ends of first tubular coalescing unit 11, second tubular coalescing unit 12, and third tubular coalescing unit 13. The dehydration efficiency is calculated based on the sampling results of each sampling valve, and the electric field frequency and intensity are adjusted.

[0039] Electric field strength ( ) directly determines the droplet polarization degree and the driving force of coalescence. According to the polarization force formula When the field strength increases, the attraction between droplets increases quadratically, promoting chain coalescence. However, there is a critical field strength ( is the interfacial tension), which triggers electro-dispersion when it exceeds the limit, causing large water droplets to break into small droplets. Frequency ( ) determines the electric field action mode. At low frequencies, breakdown is more likely to occur; high-frequency pulse electric fields shorten the single pulse action time, making breakdown less likely, increasing agglomeration efficiency and reducing maintenance.

[0040] Example 2 This embodiment provides a parallel-tube multi-frequency electric field enhanced coalescence method, based on the parallel-tube multi-frequency electric field enhanced coalescer provided in Example 1. The specific method is as follows: The crude oil emulsion enters the parallel tubular multi-frequency electric field enhanced coalescer through the manifold inlet. Under the action of the inlet baffle, the crude oil emulsion is distributed to the inlet pipes of each level and enters the corresponding tubular coalescing units of each level through the inlet pipes of each level for oil-water separation. Under the action of the multi-frequency electric field enhancement, the water droplets in the oil coalesce and settle, and then pass through the outlet pipes of each level and converge into the manifold outlet, and then enter the gravity sedimentation tank through the manifold outlet.

[0041] After the crude oil emulsion is distributed to each inlet pipe, the first sampling results are obtained through the first, second, and third inlet sampling valves, and the water content in the oil at the inlet is calculated. The second sampling results are obtained through the first, second, and third outlet sampling valves, and the water content in the oil at the outlet is calculated. The sampling results from each sampling valve can be used to calculate the dehydration efficiency of the parallel-tube multi-frequency electric field enhanced coalescer, and the appropriate electric field parameters can be adjusted based on the dehydration efficiency results.

[0042] Sampling valves are set at the inlet and outlet, mainly used to regularly collect samples to measure parameters such as moisture content (distillation method) and sand content (weight method), to verify whether the dehydration efficiency meets the design requirements, and to determine the optimal operating parameter combination by comparing samples at different nodes and analyzing the changes in moisture content after electric field strength and frequency adjustment.

[0043] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A parallel tube multi-frequency electric field enhanced coalescer, characterized in that: include: The inlet manifold system, parallel tubular coalescing unit, integrated high-voltage power supply system and outlet manifold system are connected in sequence from bottom to top; The inlet manifold system includes a manifold inlet and inlet pipes at each stage, the parallel tubular agglomeration unit includes inclined tubular agglomeration units at each stage, wherein the inlet pipes at each stage are respectively connected to one end of the tubular agglomeration units at each stage in sequence, the outlet manifold system includes a manifold outlet and outlet pipes at each stage, the other ends of the tubular agglomeration units at each stage are respectively connected to the outlet pipes at each stage in sequence; and the integrated high-voltage power supply system is electrically connected to the parallel tubular agglomeration units.

2. The parallel-tube multi-frequency electric field enhanced coalescer according to claim 1, characterized in that: The inlet pipes at each stage include a first inlet pipe, a second inlet pipe and a third inlet pipe; the tubular agglomeration units at each stage include a first tubular agglomeration unit, a second tubular agglomeration unit and a third tubular agglomeration unit designed in parallel; the outlet pipes at each stage include a first outlet pipe, a second outlet pipe and a third outlet pipe.

3. The parallel-tube multi-frequency electric field enhanced coalescer according to claim 1, characterized in that: The manifold inlet is connected to the crude oil emulsion, and the manifold outlet is connected to the gravity sedimentation tank; an inlet baffle is provided between the manifold inlet and the second inlet pipe to achieve uniform distribution of the inlet flow; and drain valves are provided between the manifold inlet and the first inlet pipe and the third inlet pipe respectively to achieve sand discharge.

4. The parallel-tube multi-frequency electric field enhanced coalescer according to claim 2, characterized in that: The first tubular agglomeration unit, the second tubular agglomeration unit and the third tubular agglomeration unit are all arranged at an angle, and cylindrical insulating electrodes and fixed plates are provided in the first tubular agglomeration unit, the second tubular agglomeration unit and the third tubular agglomeration unit. The fixed plates are connected to the cylindrical electrodes and the corresponding tubular agglomeration units of each stage through flanges.

5. The parallel-tube multi-frequency electric field enhanced coalescer according to claim 2, characterized in that: The first tubular coalescing unit is connected to the second tubular coalescing unit via the first inlet pipe and the second inlet pipe using an integrated high-voltage line; The second tubular coalescing unit is connected to the third tubular coalescing unit via the second outlet pipe and the third outlet pipe using an integrated high-voltage line; the three-tubular coalescing unit is connected to the integrated high-voltage power supply system via the third inlet pipe using an integrated high-voltage line.

6. The parallel-tube multi-frequency electric field enhanced coalescer according to claim 2, characterized in that: The first inlet pipe, the second inlet pipe and the third inlet pipe are respectively provided with a first inlet sampling valve, a second inlet sampling valve and a third inlet sampling valve, and the first inlet sampling valve, the second inlet sampling valve and the third inlet sampling valve are respectively close to the first tubular coalescing unit, the second tubular coalescing unit and the third tubular coalescing unit.

7. The parallel-tube multi-frequency electric field enhanced coalescer according to claim 2, characterized in that: The first outlet pipe, the second outlet pipe and the third outlet pipe are respectively provided with a first outlet sampling valve, a second outlet sampling valve and a third outlet sampling valve, and the first outlet sampling valve, the second outlet sampling valve and the third outlet sampling valve are respectively close to the first tubular coalescing unit, the second tubular coalescing unit and the third tubular coalescing unit.

8. The parallel-tube multi-frequency electric field enhanced coalescer according to claim 1, characterized in that: The integrated high-voltage power supply system includes a high-voltage power supply, a transformer and an integrated high-voltage line, wherein the transformer is connected to the high-voltage power supply via the integrated high-voltage line.

9. A parallel-tube multi-frequency electric field enhanced coalescence method, based on the parallel-tube multi-frequency electric field enhanced coalescer according to any one of claims 1 to 9, characterized in that: include: The crude oil emulsion enters the parallel tubular multi-frequency electric field enhanced coalescer through the manifold inlet. Under the action of the inlet baffle, the crude oil emulsion is distributed to the inlet pipes of each level and enters the corresponding tubular coalescing units of each level through the inlet pipes of each level for oil-water separation. Under the action of the multi-frequency electric field enhancement, the water droplets in the oil coalesce and settle, and then pass through the outlet pipes of each level and converge into the manifold outlet, and then enter the gravity sedimentation tank through the manifold outlet.

10. The parallel-tube multi-frequency electric field enhanced agglomeration method according to claim 9, characterized in that: Also includes: After the crude oil emulsion is distributed to the inlet pipes at each level, the first sampling result is obtained through the first inlet sampling valve, the second inlet sampling valve, and the third inlet sampling valve, and the water content in the oil at the inlet is calculated; the second sampling result is obtained through the first outlet sampling valve, the second outlet sampling valve, and the third outlet sampling valve, and the water content in the oil at the outlet is calculated.

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