Compact pipeline type oil-water separation front electrostatic coalescer

Abstract

The utility model discloses a compact pipeline type oil-water separation front electrostatic coalescer which is provided with an electrode and an upper shell, an exhaust port and a liquid outlet are formed in the upper shell, and a top cover, an upper flange, the upper shell, a lower flange, a lower shell and a liquid inlet are sequentially connected; the electrode is a high-voltage electrode and is installed in the upper shell through the upper flange and the lower flange, the electrode serves as a positive electrode, the upper shell serves as a negative electrode, the electrode and the high-voltage cable are connected in the top cover, and the other end of the high-voltage cable is connected with the electrical control cabinet; a liquid flow hole is formed in the lower flange and communicated with the device flow channel, and produced liquid from an oil well enters from the liquid inlet and flows into next oil-water separation equipment through the device flow channel in the lower shell, the gap between the upper shell and the electrode and the liquid outlet. The device is simple and compact in structure, the high-voltage electrode is used in the device and is a cylindrical electrode, a non-uniform electric field can be formed, liquid drop coalescence is facilitated, and the separation efficiency of a subsequent oil-water separation process is improved.

Description

Technical Field

[0001] The utility model relates to an oil-water separation device for produced liquid in the petroleum industry, in particular to a compact pipeline type oil-water separation pre-static coalescer. Background Art

[0002] At present, most of my country's onshore oil fields have entered a high water content period. Moreover, with the large-scale application of tertiary oil recovery, the crude oil emulsion produced has the characteristics of high viscosity, high water content, strong conductivity, and severe emulsification. At present, as far as crude oil dehydration is concerned, oil fields generally use the process of "three-stage three-phase gravity separator + electric dehydration salter". The entire process occupies a large area, has low dehydration efficiency, and high energy consumption. It is difficult to meet the current development needs of oil fields. Therefore, it is particularly important to simplify the crude oil dehydration process and make the dehydration equipment compact and efficient.

[0003] At present, there are two main methods for removing free water from crude oil: gravity sedimentation and centrifugal separation. However, when faced with more stable oil-water emulsions, the oil-water separation efficiency obtained using gravity sedimentation and centrifugal separation is low. It is difficult to quickly and efficiently remove emulsified water using these two methods.

[0004] With the continuous development of the oil industry, researchers have proposed using electrostatic demulsification to remove emulsified water from oil-water emulsions. The principle of electrostatic demulsification is to flow the oil-water emulsion between positive and negative electrodes that can generate a high-voltage electric field. The emulsion droplets can collide with each other under the dual effects of the electric field force and gravity, and the interface film between the droplets breaks and fuses, so that the small water droplets coalesce into large water droplets that can be better separated from the emulsion.

[0005] However, most of the insulation forms of electrostatic condensers currently studied are spraying insulating coatings on the surface of high-voltage electrodes. Due to the immaturity of the spraying process, the work of the insulating coatings is extremely unreliable and electrical breakdown may occur due to weakness or defects at a certain point.

[0006] The existing pipeline electrostatic coalescer adopts a straight-through design, and both ends are connected to the system pipeline through flange connections, which has the advantages of easy installation, simple structure, safety and reliability. Through experimental research on the influence of parameters such as electric field intensity, frequency, residence time, and water content of emulsion under the action of high-frequency / high-voltage AC pulse electric field and high-voltage industrial frequency sine wave electric field on the droplet coalescence effect of the pipeline electrostatic coalescer, the application of the pipeline electrostatic coalescer before the sedimentation tank can increase the droplet particle size several times, which can greatly reduce the volume of subsequent dehydration equipment or reduce the number of subsequent dehydration equipment, but the volume is large.

[0007] In the early 1990s, electric field demulsification and pre-agglomeration equipment represented by compact electrostatic coalescers and inline electrostatic coalescers appeared one after another. During the working process, the oil-water mixture first passes through the electric field demulsification and pre-agglomeration equipment to make the dispersed phase water particles therein coalesce and grow, and then the demulsified oil-water mixture is effectively separated, that is, the two processes of "first coalescence and then separation". Although this type of process improves the compactness of the device, before the fluid after electrostatic coalescence enters the separation equipment, the valves and pipe fittings on the flow pipeline will cause the coalesced and grown dispersed phase water particles to be broken again, thereby affecting the separation performance downstream. Therefore, after entering the 21st century, relevant technical personnel proposed the concept of "coalescing and separating at the same time", that is, the two processes of electric field demulsification, coalescence and growth of dispersed phase water particles and oil-water separation are carried out simultaneously in the tubular separator. Since the 1990s, relevant domestic and foreign oil companies and oil and gas gathering and processing equipment suppliers have carried out a series of application research work around the core concept of efficient and compact separation. After searching, the following related patent technologies are found: Chinese patent CN110295056B discloses a tubular electric field demulsification cyclone separator for oil-water separation, and proposes to improve the oil-water separation performance of the equipment through the synergistic effect of three fields: electric field, centrifugal field and gravity field. It includes at least one separation unit. This separation unit includes: an outer tube, an inner tube, a central rod, an enhanced cyclone area, a baffle cone, etc. The water outlet is arranged at the lower part of the outer tube, and the inner tube and the outer tube are coaxially arranged, and an annular space is formed between the inner tube and the outer tube. The inlet is connected to the annular space, and the oil-water mixture will move in the annular space when entering from the inlet. An enhanced cyclone area is also provided in this annular space. The baffle cone is arranged in the outer tube at the front end of the water outlet. A guide hole is provided on the baffle cone to connect it to the water outlet, and the inner tube is connected to the external power supply through oil-resistant and explosion-proof wires; the outer tube and the central rod are both grounded.

[0008] The above invention uses the synergistic effect of the electric field, cyclone field and gravity field to achieve electric field agglomeration and demulsification and oil-water separation in the pipeline, thereby effectively utilizing the internal space. It has a compact and efficient structure and occupies a small space. It can adapt to special working conditions with high water content and high oil-water emulsification, and can implement multi-stage series operation according to the requirements of the water content of the oil outlet.

[0009] However, although this device can improve the efficiency of oil-water separation, its energy consumption is relatively high and under the coupling of high-voltage electric field and cyclone, electric dispersion problems may occur, resulting in a decrease in separation efficiency.

[0010] Chinese patent CN107619676B designs a compact electrostatic coalescence separation device. This invention includes an inlet pipeline, an electrostatic coalescence separator, an exhaust pipeline, an oil discharge pipeline, a drainage pipeline, a coalescence pipe bracket, a transformer guardrail and a skid-mounted chassis. The inlet pipeline includes an inlet pipe, a pump, a bypass gate valve, a main gate valve, a thermometer, a pressure gauge and a flow meter; the electrostatic coalescence separator includes a transformer, a first-level coalescence pipe, a first-level vertical separator, a second-level coalescence pipe and a second-level vertical separator; the exhaust pipeline consists of a first pressure control valve, a second pressure control valve and an exhaust pipeline; the oil discharge pipeline consists of an oil-water interface meter, an oil level control valve, an oil outlet flow meter and an oil discharge pipeline.

[0011] The above invention combines the characteristics of rapid agglomeration and sedimentation of water particles in crude oil in a tubular agglomerator with the advantage of a small footprint of a vertical separator, making transportation, installation and on-site testing more convenient; at the same time, compared with the horizontal installation of the agglomeration tube, the inclined installation method increases the electric field action distance and time, improves the agglomeration effect, and makes the overall structure more compact.

[0012] However, it adopts multiple coalescence and separation settings to ensure the oil-water separation efficiency, and its structure is complex, which increases the manufacturing cost.

[0013] In order to adapt to the oil-water separation equipment that is currently widely used in oil production sites, improve its oil-water separation efficiency and reduce its volume, it is necessary to manufacture a compact front electrostatic coalescer. Summary of the invention

[0014] The utility model provides a compact pipeline oil-water separation pre-electrostatic coalescer, which reduces the volume of the coalescer and serves as a pre-treatment device for oil-water separation processing equipment. It utilizes the effect of an electric field to improve the oil-water separation performance, so as to adapt to the oil-water separation equipment currently used in oil production sites, reduce the burden on subsequent oil-water separation equipment or reduce the number of subsequent oil-water separation equipment used, thereby reducing production costs.

[0015] In order to achieve the above-mentioned objectives, the technical solution adopted by the utility model is: a compact pipeline oil-water separation pre-electrostatic coalescer, provided with an electrode and an upper shell, an exhaust port and a liquid outlet are provided in the upper shell, wherein: a top cover, an upper flange, an upper shell, a lower flange, a lower shell and a liquid inlet are connected in sequence; the electrode is a high-voltage electrode and is installed in the upper shell through an upper flange and a lower flange, the electrode serves as a positive electrode, the upper shell serves as a negative electrode, and the electrode is connected to a high-voltage cable in the top cover; the other end of the high-voltage cable is connected to an electrical control cabinet; a liquid flow hole is provided in the lower flange and the liquid flow hole is connected to a device flow channel, and the produced liquid from the oil well enters from the liquid inlet, passes through the device flow channel in the lower shell, the gap between the upper shell and the electrode and the liquid outlet and flows into the next oil-water separation device.

[0016] Preferably, the voltage between the electrode and the upper shell is set between 5 kV and 7 kV; the top cover, upper flange, upper shell, lower flange, lower shell and liquid inlet are connected in sequence by bolts.

[0017] Preferably, the electrode is a cylindrical electrode and is provided with a polytetrafluoroethylene insulation layer greater than 3 mm on the outside, the upper shell and the lower shell are both tubular bodies, an annular space is formed between the electrode and the upper shell, and the gap between the electrode and the upper shell is set between 2cm-3cm.

[0018] Preferably, the upper flange and the lower flange are both flanges of a T-shaped structure provided with fixed chambers, and the electrodes are installed in the corresponding fixed chambers in the upper flange and the lower flange.

[0019] Preferably, the liquid flow holes in the lower flange are arranged in a disk body at the outer periphery of the fixed chamber of the lower flange, and the number of the liquid flow holes is more than three.

[0020] Preferably, the connection terminal of the electrode is connected to the high-voltage cable in the top cover through an electrode fixing nut and an insulating washer is installed outside the electrode fixing nut; an insulating tube is installed outside the high-voltage cable.

[0021] Preferably, the insulating gasket and the insulating tube installed outside the high-voltage cable are both made of polytetrafluoroethylene; and the connection between the upper shell and the lower shell is connected to the electrical control cabinet through a grounding cable.

[0022] Preferably, the liquid inlet is a curved pipe with flanges at both ends, and the liquid inlet and liquid outlet are respectively arranged on an axis on the same side of the lower shell and the upper shell; a liquid inlet sampling port is provided in the connecting pipeline at the inlet end of the liquid inlet, and a liquid outlet sampling port is provided in the connecting pipeline at the outlet end of the liquid outlet.

[0023] Preferably, the lower shell and the liquid inlet are installed in a fixed bracket.

[0024] Preferably, the front electrostatic coalescer is a vertical coalescer, and the upper shell and the lower shell containing the electrodes are vertically assembled and installed.

[0025] Compared with the prior art, the remarkable use effects of the utility model are as follows: the utility model has a simple and compact structure, and a high-voltage electrode is used in the device, and the electrode is a cylindrical electrode, which can form an uneven electric field, which is conducive to the coalescence of droplets. The electrode is used as a positive electrode, the upper shell is used as a negative electrode, and an annular space is formed between the electrode and the upper shell, so that the oil well production fluid flowing in from the liquid inlet passes through the device flow channel and the annular space between the electrode and the upper shell, so that the water molecules in the oil well production fluid are coalesced in the electric field between the electrode and the upper shell, and then enter the subsequent oil-water separation process. It can effectively improve the separation efficiency of the subsequent oil-water separation equipment, thereby reducing the processing burden of the subsequent oil-water separation equipment or reducing its use quantity.

[0026] In the utility model, the electrode as a whole serves as the positive electrode of the electrostatic coalescer, and the upper shell serves as the negative electrode. The electrode is connected to the high-voltage cable in the top cover, and the electrode terminal does not contact the produced liquid, thereby improving the working stability of the coalescer equipment.

[0027] This device is a vertically installed vertical coalescer. The inlet of the produced liquid is set at the bottom of the coalescer, and the produced liquid enters from the bottom of the coalescer. After the produced liquid enters the coalescer, it flows into the annular space between the electrode and the upper shell and flows upward. The droplets collide and coalesce in the gap and become several times larger than the original size, which can increase the residence time of the produced liquid in the electric field and improve the coalescing efficiency.

[0028] The utility model provides a compact insulating layer on the outside of the electrode, which can eliminate the short circuit phenomenon of the electrode and reduce the energy consumption of the coalescer.

[0029] The utility model can increase the voltage and adjust the electric field frequency through the electrical control cabinet, adjust the flow rate of the produced fluid through the electrical control cabinet, increase the electric field residence time, etc., to improve the agglomeration effect of water molecules and improve the separation efficiency of the subsequent oil-water separation process.

[0030] The distance between the electrode and the upper shell in the utility model is small, only 2cm-3cm, and the overall structure is more compact, smaller in size, occupies less space, and is lighter in weight, and can adapt to special working conditions with high water content and high oil-water emulsification.

[0031] The utility model is not only suitable for emulsions with high water content, but is also practical for electric field demulsification of inferior crude oil emulsions such as aged oil and acidic crude oil, and can effectively improve the demulsification and agglomeration efficiency, with good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a structural schematic diagram of the utility model.

[0034] Wherein: top cover 1, upper flange 2, upper shell 3, lower shell 4, liquid inlet 5, device flow channel 6, lower flange 7, electrode 8, liquid outlet 9, exhaust port 10, electrode fixing nut 11, high-voltage cable 12, insulating gasket 13, fixing bracket 14, electrical control cabinet 15, liquid outlet sampling port 16, liquid inlet sampling port 17. DETAILED DESCRIPTION

[0035] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0036] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] See also Figure 1A compact pipeline type oil-water separation pre-electrostatic coalescer is provided with an electrode 8 and an upper shell 3, wherein an exhaust port 10 and a liquid outlet 9 are provided in the upper shell 3, wherein: a top cover 1, an upper flange 2, an upper shell 3, a lower flange 7, a lower shell 4 and a liquid inlet 5 are connected in sequence; the electrode 8 is a high-voltage electrode and is installed in the upper shell 3 through the upper flange 2 and the lower flange 7, the electrode 8 is used as a positive electrode, the upper shell 3 is used as a negative electrode, and the electrode 8 is connected to a high-voltage cable 12 in the top cover 1; the other end of the high-voltage cable 12 is connected to an electrical control cabinet 15; a liquid flow hole is provided in the lower flange 7 and the liquid flow hole is connected to a device flow channel 6, and the produced liquid from the oil well enters from the liquid inlet 5, passes through the device flow channel 6 in the lower shell 4, the gap between the upper shell 3 and the electrode 8 and the liquid outlet 9 and flows into the next oil-water separation device.

[0039] The utility model uses a high-voltage electrode, with the electrode 8 as the positive electrode and the upper shell 3 as the negative electrode, and a gap is formed between the electrode 8 and the upper shell 3, so that the oil well produced liquid flowing in from the liquid inlet 5 passes through the device flow channel 6 and the gap between the electrode 8 and the upper shell 3, and then enters the next oil-water separation device through the liquid outlet 9. The water particles in the oil well produced liquid are agglomerated in the electric field between the electrode 8 and the upper shell 3, and then enter the subsequent oil-water separation process. The overall structure of the device is simple, compact, and small in size, which can effectively improve the separation efficiency of the next oil-water separation device, thereby reducing the processing burden of the subsequent oil-water separation device or reducing its use quantity.

[0040] like Figure 1 As shown, the electrode 8 as a whole serves as the positive electrode of the electrostatic coalescer, and the upper shell 3 serves as the negative electrode. The electrode 8 is connected to the high-voltage cable 12 in the top cover 1, and the terminal of the electrode 8 is not in contact with the produced fluid, thereby improving the stability of the coalescer equipment. After the power is turned on through the electrical control cabinet 15, a non-uniform electric field can be formed between the upper shell 3 and the electrode 8, which is used for electric field demulsification of oil-water emulsion.

[0041] As a pre-placed oil-water separation device, the utility model has a compact structure and occupies a small space, and can adapt to special working conditions with high water content and high oil-water emulsification degree.

[0042] Based on the above-mentioned embodiment 1, the utility model also has the following embodiments: A preferred embodiment: the voltage between the electrode 8 and the upper shell 3 is set between 5 kV and 7 kV; the top cover 1, upper flange 2, upper shell 3, lower flange 7, lower shell 4 and liquid inlet 5 are connected in sequence by bolts.

[0043] A preferred embodiment: the electrode 8 is a cylindrical electrode and a polytetrafluoroethylene insulation layer greater than 3 mm is provided on the outside. The upper shell 3 and the lower shell 4 are both tubular bodies. An annular space is formed between the electrode 8 and the upper shell 3, and the gap between the electrode 8 and the upper shell 3 is set between 2 cm and 3 cm. The electrode 8 is a cylindrical electrode and the gap between it and the upper shell 3 is small. It serves as the positive pole of the electric field. The annular space formed between it and the upper shell 3, which serves as the negative pole of the electric field, becomes the device flow channel 6 for the produced liquid to flow through the upper shell 3. The oil-water mixture will be separated by the electric field in the device flow channel 6. The water particles are agglomerated under the action of the electric field and flow from the liquid outlet 9 to the next oil-water separation treatment equipment.

[0044] In a preferred embodiment, the upper flange 2 and the lower flange 7 are both flanges of a T-shaped structure provided with fixed chambers, and the electrodes 8 are installed in the corresponding fixed chambers in the upper flange 2 and the lower flange 7 .

[0045] A preferred embodiment: the liquid flow holes in the lower flange 7 are arranged in the disk body at the outer periphery of the fixed chamber of the lower flange 7, and the number of the liquid flow holes is more than three.

[0046] A preferred embodiment: the terminal of the electrode 8 is connected to the high voltage cable 12 in the top cover 1 through the electrode fixing nut 11 and an insulating washer is installed outside the electrode fixing nut 11 13 The high voltage cable 12 is provided with an insulating tube outside.

[0047] A preferred embodiment: the insulating gasket 13 and the insulating tube installed outside the high-voltage cable 12 are both made of polytetrafluoroethylene; the connection between the upper shell 3 and the lower shell 4 is connected to the electrical control cabinet 15 through a grounding cable. For safety reasons, the high-voltage cable 12 is sheathed in a polytetrafluoroethylene tube and connected to the power supply in the electrical control cabinet 15, and a high-voltage electric field is introduced into the utility model. At the same time, the connection between the upper shell 3 and the lower shell 4 is connected to the electrical control cabinet 15 through a grounding cable. Various insulation measures are set to ensure good insulation performance of the device.

[0048] A preferred embodiment: the liquid inlet 5 is a curved pipe with flanges at both ends, and the liquid inlet 5 and the liquid outlet 9 are respectively arranged on an axis on the same side of the lower shell 4 and the upper shell 3; a liquid inlet sampling port 17 is arranged in the connecting pipeline at the inlet end of the liquid inlet 5, and a liquid outlet sampling port 16 is arranged in the connecting pipeline at the outlet end of the liquid outlet 9. The liquid inlet sampling port 17 is arranged at the liquid inlet 5 and the liquid outlet sampling port 16 is arranged at the liquid outlet 9 to facilitate sampling and testing, and to understand the agglomeration effect of the utility model on water molecules at any time.

[0049] A preferred embodiment: the lower shell 4 and the liquid inlet 5 are installed in the fixing bracket 14, and the part below the lower shell 4 is fixed by the fixing bracket 14 to improve the stability of the device.

[0050] A preferred embodiment: the front electrostatic coalescer is a vertical coalescer, and the upper shell 3 and the lower shell 4 equipped with the electrode 8 are vertically assembled and installed. Compared with the horizontally installed coalescer, the vertical installation method increases the action distance and time of the electric field, improves the coalescing effect of water molecules, and makes the overall structure more compact, which can reduce the floor space.

[0051] The utility model can also be used to conduct an electrostatic coagulation and separation test on the produced liquid: using this device, a sample is obtained at the liquid inlet 5, and after the water molecules in the original sample are coagulated by high pressure, a sample is obtained from the liquid outlet 9, and the microscopic photographs of the droplets of the two samples are observed. Analysis of the droplet particle sizes of the two samples can intuitively reflect the coagulation effect of the water molecules.

[0052] According to the properties of the crude oil emulsion, different flow rates can be obtained for the produced liquid by adjusting the electrical control cabinet 15, and then by sampling and measuring at the liquid inlet 5 and the liquid outlet 9 of the utility model, observing the microscopic photographs of the sample droplets obtained at different flow rates, and analyzing the droplet particle sizes of different samples can intuitively reflect the aggregation effect of water molecules at different flow rates, thereby obtaining the optimal flow rate.

[0053] By adjusting the power supply of the electrical control cabinet 15, different electric field strengths and frequencies can be obtained, and the produced liquid can be separated and agglomerated under different electric field strengths and electric field frequencies. Sampling and measurement are performed at the liquid inlet 5 and the liquid outlet 9 of the utility model, and microscopic photographs of sample droplets under different electric field strengths and frequencies are observed. Analysis of the droplet particle sizes of different samples can intuitively reflect the agglomeration effect of water molecules under different electric field strengths and frequency agglomeration effects, thereby obtaining the optimal flow rate.

[0054] By replacing the electrode 8 in the utility model with electrodes 8 of different voltages, the effects of different electrodes 8 on separation and agglomeration of the produced liquid under the same electric field parameters are obtained. Sampling is performed at the liquid inlet 5 and the liquid outlet 9 of the agglomerator, and microscopic photographs of sample droplets obtained under different electrodes 8 are observed. Analysis of the droplet particle sizes of different samples can intuitively reflect the agglomeration effect of water molecules under the agglomeration effect of different electrodes 8, thereby obtaining the optimal electrode parameters.

[0055] Through experiments, we can obtain the optimal flow rate, optimal electric field strength and frequency, and optimal circular electrode required for the aggregation of water molecules under different water contents.

[0056] In summary, the utility model can make the water molecules in crude oil quickly aggregate and settle, and occupies a small area, and its transportation, installation and on-site testing are more convenient.

[0057] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A compact pipeline type oil-water separation pre-electrostatic coalescer, provided with electrodes and an upper shell, wherein an exhaust port and a liquid outlet are provided in the upper shell, wherein the characteristics are: The top cover, upper flange, upper shell, lower flange, lower shell and liquid inlet are connected in sequence; the electrode is a high-voltage electrode and is installed in the upper shell through the upper flange and the lower flange. The electrode serves as a positive electrode and the upper shell serves as a negative electrode. The electrode and the high-voltage cable are connected in the top cover; the other end of the high-voltage cable is connected to the electrical control cabinet; a liquid flow hole is provided in the lower flange and the liquid flow hole is connected to the device flow channel. The produced liquid from the oil well enters from the liquid inlet, passes through the device flow channel in the lower shell, the gap between the upper shell and the electrode and the liquid outlet and flows into the next oil-water separation equipment.

2. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 1, characterized in that: The voltage between the electrode and the upper shell is set between 5 kV and 7 kV; the top cover, upper flange, upper shell, lower flange, lower shell and liquid inlet are connected in sequence by bolts.

3. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 2, characterized in that: The electrode is a cylindrical electrode and is provided with a polytetrafluoroethylene insulation layer greater than 3 mm on the outside. The upper shell and the lower shell are both tubular bodies. An annular space is formed between the electrode and the upper shell, and the gap between the electrode and the upper shell is set between 2 cm and 3 cm.

4. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 1, characterized in that: The upper flange and the lower flange are both flanges of a T-shaped structure with fixed chambers, and the electrodes are installed in the corresponding fixed chambers in the upper flange and the lower flange.

5. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 4, characterized in that: The liquid flow holes in the lower flange are arranged in the disk body outside the fixed cavity of the lower flange, and the liquid flow holes are arranged in more than three.

6. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 3, characterized in that: The connection terminal of the electrode is connected to the high-voltage cable in the top cover through an electrode fixing nut, and an insulating washer is arranged outside the electrode fixing nut; an insulating tube is arranged outside the high-voltage cable.

7. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 6, characterized in that: The insulating gasket and the insulating tube installed outside the high-voltage cable are both made of polytetrafluoroethylene; the connection between the upper shell and the lower shell is connected to the electrical control cabinet through a grounding cable.

8. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 1, characterized in that: The liquid inlet is a curved pipe with flanges at both ends, and the liquid inlet and liquid outlet are respectively arranged on an axis on the same side of the lower shell and the upper shell; a liquid inlet sampling port is provided in the connecting pipeline at the inlet end of the liquid inlet, and a liquid outlet sampling port is provided in the connecting pipeline at the outlet end of the liquid outlet.

9. A compact pipeline oil-water separation pre-electrostatic coalescer as claimed in claim 8, characterized in that: The lower shell and the liquid inlet are installed in a fixed bracket.

10. A compact pipeline oil-water separation pre-electrostatic coalescer according to any one of claims 1 to 9, characterized in that: The front electrostatic coalescer is a vertical coalescer, and the upper shell and the lower shell equipped with electrodes are vertically assembled and installed.

Images