Crude oil electric dehydration device coupling turbulent flow field and non-uniform electric field-magnetic field

Abstract

The invention belongs to the technical field of electric demulsification dehydration in crude oil production and processing, and particularly relates to a turbulent flow field and non-uniform electric field-magnetic field coupled crude oil electric dehydration device which comprises a horizontal tank body, a liquid distribution structure and a demulsification structure coupled with a turbulent flow field and a non-uniform electric field-magnetic field, the liquid distribution structure and the demulsification structure are arranged in the horizontal tank body, and the demulsification structure is located above the liquid distribution structure; the upper end of the horizontal tank body is provided with an oil outlet, and the lower end is provided with a water outlet. According to the device disclosed by the invention, a turbulent flow field, a non-uniform electric field and a non-uniform magnetic field are combined, so that small liquid drops in a dispersed phase are more easily coalesced to generate large liquid drops in an electric demulsification dehydration process, and the small liquid drops in crude oil emulsion can be subjected to extra electromagnetic polarization force by the non-uniform magnetic field; in the electric dehydration process, the critical electric field intensity of crude oil emulsion can be increased, so that the dehydration efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of electro-demulsification and dehydration technology in crude oil production and processing, specifically relating to a crude oil electro-dehydration device that couples a turbulent flow field with a non-uniform electric-magnetic field. Background Technology

[0002] Crude oil dehydration is a crucial and indispensable step in crude oil production and processing. Common crude oil dehydration technologies include sedimentation dehydration, chemical demulsification dehydration, and electro-demulsification dehydration. Compared with sedimentation dehydration and chemical demulsification dehydration, electro-demulsification dehydration is not only economical and suitable for large-scale continuous operation, but also has significant advantages in processing efficiency.

[0003] Electrodemulsification is a dehydration technique that places a crude oil emulsion in a high-voltage electric field. The electric field exerts forces on the dispersed water particles, causing them to deform and move, promoting collisions and aggregation of small water particles, thus facilitating sedimentation. However, as oil fields enter the high water-cut development stage, tertiary oil recovery technologies are widely used, increasing the conductivity and viscosity of crude oil. This makes electrodemulsification dehydration more challenging due to issues such as high current and unstable electric fields.

[0004] Chinese patent applications CN118599570A (a crude oil emulsion electric field demulsification electrode assembly and separator) and CN118599574A (a crude oil dehydration integrated treatment device and integrated process) both employ a scheme that couples turbulent flow field and electric field to dehydrate crude oil emulsions. Increasing the electric field strength can improve the demulsification efficiency, but if the electric field strength exceeds the critical electric field strength, the demulsification effect will be poor.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] To address the technical problems existing in the prior art, this invention provides a crude oil electro-dehydration device that couples a turbulent field with a non-uniform electric-magnetic field. This device combines a turbulent field, a non-uniform electric field, and a non-uniform magnetic field, making it easier for small droplets in the dispersed phase to coalesce into larger droplets during the electro-demulsification and dehydration process. The non-uniform magnetic field subjectes small droplets in the crude oil emulsion to additional electromagnetic polarization forces, increasing the critical electric field strength of the crude oil emulsion during electro-dehydration. This prevents small droplets in the crude oil emulsion from breaking down even under higher electric field strengths and increases the probability of collision and coalescence of small water droplets in the dispersed phase. This more effectively addresses the difficulties in water droplet coalescence and low dehydration rates in crude oil emulsions, thereby improving dehydration efficiency.

[0007] This invention includes the following technical solutions:

[0008] The present invention provides a crude oil electro-dehydration device that couples a turbulent field with a non-uniform electric field-magnetic field, including a horizontal tank, a liquid distribution structure, and a demulsification structure that couples a turbulent field with a non-uniform electric field-magnetic field.

[0009] The liquid distribution structure and the demulsification structure are located inside the horizontal tank, with the demulsification structure positioned above the liquid distribution structure.

[0010] The horizontal tank is provided with an oil outlet at the upper end and a water outlet at the lower end.

[0011] Furthermore, the demulsification structure includes a first electrode plate, a second electrode plate, a first rod-shaped magnet, and a second rod-shaped magnet. The first electrode plate and the second electrode plate are arranged facing each other, and both the first electrode plate and the second electrode plate are provided with a corrugated structure. The first rod-shaped magnet and the second rod-shaped magnet are both disposed between the first electrode plate and the second electrode plate, with the first rod-shaped magnet located at the upper end and the second rod-shaped magnet located at the lower end. The first rod-shaped magnet and the second rod-shaped magnet are staggered, and the polarity of the end of the first rod-shaped magnet near the second rod-shaped magnet is the same as the polarity of the end of the second rod-shaped magnet near the first rod-shaped magnet.

[0012] Furthermore, multiple demulsification structures are provided, and the multiple demulsification structures are evenly distributed.

[0013] Furthermore, the first electrode plates of the plurality of demulsification structures are connected in series, and the second electrode plates of the plurality of demulsification structures are connected in series.

[0014] Furthermore, it also includes a high-frequency power supply, which is connected to the first electrode plate and the second electrode plate.

[0015] Furthermore, it also includes two lead wire insulating rods disposed outside the horizontal tank body, the two lead wire insulating rods being connected to the first electrode plate and the second electrode plate respectively.

[0016] Furthermore, the liquid distribution structure includes an inlet pipe and a distribution pipe. One end of the inlet pipe is located outside the horizontal tank, and the other end is located inside the horizontal tank. The inlet pipe located inside the horizontal tank is connected to the distribution pipe, and the distribution pipe is provided with a distribution hole facing the side of the horizontal tank.

[0017] Furthermore, the liquid distribution pipe is configured in an H-shape, and the H-shaped liquid distribution pipe is provided with liquid distribution holes facing the opposite sides of the horizontal tank.

[0018] Furthermore, the H-shaped liquid distribution pipe is provided in two parts.

[0019] By adopting the above technical solution, the present invention has the following advantages:

[0020] 1. The device of this invention combines turbulent field, non-uniform electric field and non-uniform magnetic field, which makes it easier for small droplets in the dispersed phase to coalesce into large droplets during the electro-demulsification and dehydration process. The non-uniform magnetic field can subject small droplets in crude oil emulsion to additional electromagnetic polarization force, which can increase the critical electric field strength of crude oil emulsion during electro-dehydration. On the one hand, it can prevent small droplets in crude oil emulsion from breaking under higher electric field strength, and on the other hand, it increases the probability of collision and coalescence of small water droplets in the dispersed phase. It can more effectively deal with the problems of difficult coalescence of water droplets and low dehydration rate in crude oil emulsion, thereby improving dehydration efficiency.

[0021] 2. In this invention, the electrode plates (including the first electrode plate and the second electrode plate) have a corrugated structure. On the one hand, when the crude oil emulsion flows from bottom to top through the electrode plate of this shape, it is easier to form a turbulent flow field, which can increase the efficiency of electro-dehydration. On the other hand, the corrugated structure of the motor plate will not cause excessive concentration of electric field, which can avoid tip discharge and thus avoid safety hazards.

[0022] 3. Because the present invention improves the critical electric field strength, it can adapt to different dehydration requirements and different emulsion characteristics, and has good versatility and adaptability.

[0023] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0024] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view of a crude oil electro-dehydration device that couples a turbulent field with a non-uniform electric-magnetic field according to an embodiment of the present invention.

[0026] Figure 2 This is a side view of the demulsifying structure in an embodiment of the present invention;

[0027] Figure 3 This is a top view of the demulsifying structure in an embodiment of the present invention;

[0028] Figure 4 This is a front view of the liquid distribution structure in an embodiment of the present invention;

[0029] Figure 5This is a top view of the liquid distribution structure in an embodiment of the present invention;

[0030] In the diagram, 10-horizontal tank, 20-liquid distribution structure, 21-liquid inlet pipe, 22-liquid distribution pipe, 23-liquid distribution hole, 231-first round hole, 232-second round hole, 30-demulsification structure, 31-first electrode plate, 32-second electrode plate, 33-first rod magnet, 34-second rod magnet, 35-wiring opening, 40-oil outlet, 50-water outlet, 60-insulating hanger, 70-high frequency power supply, 80-lead wire insulating rod, 90-exhaust port. Detailed Implementation

[0031] The following description provides many different embodiments or examples for implementing various features of the invention. The elements and arrangements described in the specific examples below are only for concise expression of the invention and are merely examples, not intended to limit the invention.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This embodiment provides a crude oil electro-dehydration device that couples a turbulent field with a non-uniform electric-magnetic field, such as... Figure 1 As shown, it includes a horizontal tank 10, a liquid distribution structure 20, and a demulsification structure 30 that couples turbulent flow fields with non-uniform electric and magnetic fields. That is, the demulsification structure 30 can generate turbulent flow fields, non-uniform electric fields, and non-uniform magnetic fields. All existing structures that can achieve this purpose should be within the protection scope of this invention.

[0034] An electric field can demulsify crude oil. To improve demulsification efficiency, one approach is to obtain a uniform electric field, while another is to combine a non-uniform electric field with turbulence. A uniform electric field is structurally difficult to achieve, while non-uniform electric fields are structurally common. However, the demulsification efficiency of a non-uniform electric field is lower than that of a uniform electric field. Therefore, combining a turbulent field can be understood as making the flow of crude oil non-uniform. In this way, the combination of a non-uniform electric field and a turbulent field can improve the demulsification efficiency and effect, resulting in better dehydration efficiency.

[0035] In the case of a non-uniform electric field coupled with a turbulent field, there is a critical electric field strength for demulsification. Below the critical electric field strength, increasing the electric field strength can improve demulsification efficiency and effect. However, above the critical electric field strength, increasing the electric field strength at higher electric field strengths causes further breakage of small droplets in the crude oil emulsion, making oil-liquid separation more difficult and reducing demulsification efficiency and effect. Therefore, this invention couples the turbulent field with the non-uniform electric field-magnetic field, which can increase the critical electric field strength, resulting in better demulsification efficiency and effect, and further improving dehydration efficiency.

[0036] The liquid distribution structure 20 and the demulsification structure 30 are located within the horizontal tank 10, with the demulsification structure 30 positioned above the liquid distribution structure 20. It should be noted that the present invention does not limit the connection method between the liquid distribution structure 20 and the demulsification structure 30 and the horizontal tank 10. The liquid distribution structure 20 is located below the demulsification structure 30 to ensure uniform fluid flow.

[0037] The horizontal tank 10 has an oil outlet 40 at the upper end and a water outlet 50 at the lower end. After the crude oil is demulsified, the oil and water are separated. The water is discharged from the water outlet at the lower end, and the oil is discharged from the oil outlet 40 at the upper end.

[0038] In some embodiments, such as Figure 1 As shown, the demulsification structure 30 includes a first electrode plate 31, a second electrode plate 32, a first rod-shaped magnet 33, and a second rod-shaped magnet 34. The first electrode plate 31 and the second electrode plate 32 are arranged facing each other. Both the first electrode plate 31 and the second electrode plate 32 are provided with a corrugated structure, which makes it easier for crude oil to generate turbulence. The first rod-shaped magnet 33 and the second rod-shaped magnet 34 are both disposed between the first electrode plate 31 and the second electrode plate 32, with the first rod-shaped magnet 33 located at the upper end and the second rod-shaped magnet 34 located at the lower end. The first rod-shaped magnet 33 and the second rod-shaped magnet 34 are staggered, that is, as shown... Figure 2 As shown, the projection of the first rod magnet 33 onto the plane containing the second rod magnet 34 does not coincide with the second rod magnet 34, and the projection of the second rod magnet 34 onto the plane containing the first rod magnet 33 does not coincide with the first rod magnet 33; furthermore, the polarity of the end of the first rod magnet 33 closest to the second rod magnet 34 and the end of the second rod magnet 34 closest to the first rod magnet 33 are the same; it should be understood that both the first rod magnet 33 and the second rod magnet 34 include two polarities: an S pole (south pole) and a N pole (north pole); only their arrangement differs; specifically, as shown... Figure 2As shown, the upper first rod magnet 33 has the left side as the S pole (south pole) and the lower second rod magnet 34 has the left side as the N pole (north pole); alternatively, the upper first rod magnet 33 can have the left side as the N pole and the lower second rod magnet 34 as the S pole.

[0039] The direction of the electric field generated by the electrode plates arranged face to face is as follows Figure 1 As shown, the arrows from left to right indicate the direction of the generated electric field, where E represents the electric field. The directions of the magnetic fields generated by the first rod magnet 33 and the second rod magnet 34 are as follows: Figure 2 As shown, the arrow indicates the direction of the magnetic field, where B represents the magnetic field; this perpendicular orientation of the magnetic field and electric field is beneficial for improving the electro-demulsification effect.

[0040] It should be noted that, Figure 2 In this example, a demulsification structure 30 is provided with only one first rod magnet 33 and one second rod magnet 34. This number is just an example. Multiple first rod magnets 33 and multiple second rod magnets 34 can be provided, and the number of first rod magnets 33 is equal to the number of second rod magnets 34.

[0041] It should be noted that generating a magnetic field through the first rod magnet 33 and the second rod magnet 34 is a preferred method and does not represent a limitation on the present invention; of course, a magnetic field can also be generated by setting an inner coil and an outer coil, but the method of generating a magnetic field by using coils has the problems of large footprint and high investment cost.

[0042] Furthermore, such as Figure 1 As shown, the upper ends of both the first electrode plate 31 and the second electrode plate 32 are fixedly connected to the top wall of the horizontal tank 10; Figure 2 As shown, the first rod magnet 33 and the second rod magnet 34 are fixedly connected to the top wall of the horizontal tank 10 by an insulating hanger 60; in order to facilitate the connection between the first rod magnet 33 and the second rod magnet 34 and the insulating hanger 60, both the first rod magnet 33 and the second rod magnet 34 are connected with an insulating structure.

[0043] It should be noted that, although Figure 2 The electrode plates (first electrode plate 31 or second electrode plate 32) are rectangular in shape, but this shape is merely exemplary and does not imply a limitation of the invention; since the electrode plates are to be connected to the top wall of the horizontal tank 10, the shape of the upper end of the motor plate is preferably adapted to the shape of the top wall of the horizontal tank 10. Further, as... Figure 2 As shown, the electrode plate (first electrode plate 31 or second electrode plate 32) is also provided with a wiring opening 35.

[0044] In some embodiments, such as Figure 1 , Figure 3 As shown, multiple demulsification structures 30 are provided, and the multiple demulsification structures 30 are evenly distributed. The evenly distributed multiple demulsification structures 30 can further improve the dehydration effect.

[0045] When multiple demulsification structures 30 are set, each demulsification structure 30 can be connected to a separate power supply. However, this method is not only structurally complex and increases costs, but also makes it difficult to control multiple power supplies synchronously. Therefore, in some embodiments, the first electrode plates 31 of the multiple demulsification structures 30 are connected in series, and the second electrode plates 32 of the multiple demulsification structures 30 are connected in series, so that only one power supply is needed to power the demulsification structure.

[0046] The device of the present invention can be used with an external power supply; however, to improve the integration of the device, in some embodiments, such as... Figure 1 As shown, it also includes a high-frequency power supply 70, which is connected to the first electrode plate 31 and the second electrode plate 32; the first electrode plate 31 and the second electrode plate 32 are respectively connected to the positive and negative terminals of the high-frequency power supply 70.

[0047] In some embodiments, such as Figure 1 As shown, it also includes two lead wire insulating rods 80 disposed outside the horizontal tank body 10. The two lead wire insulating rods 80 are respectively connected to the first electrode plate 31 and the second electrode plate 32. During use, the lead wire insulating rods 80 are grounded, which has the advantage of preventing short circuits in the demulsification structure 30 and avoiding safety accidents.

[0048] In some embodiments, such as Figure 4 , Figure 5 As shown, the liquid distribution structure 20 includes an inlet pipe 21 and a distribution pipe 22. One end of the inlet pipe 21 is located outside the horizontal tank 10, and the other end is located inside the horizontal tank 10. The inlet pipe 21 located inside the horizontal tank 10 is connected to the distribution pipe 22. The distribution pipe 22 is provided with a distribution hole 23 facing the side of the horizontal tank 10.

[0049] In some embodiments, such as Figure 5 As shown, the liquid distribution pipe 22 is H-shaped, and the H-shaped liquid distribution pipe 22 is provided with liquid distribution holes 23 facing opposite sides of the horizontal tank 10. This allows the crude oil entering the horizontal tank 10 to be evenly distributed to all areas inside the horizontal tank 10; avoiding the problem of excessively high local concentration or uneven distribution of crude oil caused by concentration in a certain area, ensuring a more uniform distribution of crude oil within the horizontal tank 10, thereby improving dehydration efficiency. At the same time, uniform crude oil distribution also helps to reduce local overheating or overcooling, avoiding the impact of uneven temperature on the physical properties of crude oil and the dehydration process.

[0050] Preferred, such as Figure 5 As shown, two H-shaped distribution pipes 22 are provided. This has the advantage of further improving the uniformity of crude oil flow.

[0051] A single-aperture distribution hole 23 may generate significant liquid impact forces at certain locations on the horizontal tank 10, causing wear and damage. In some embodiments, the distribution hole 23 includes a first circular hole 231 and a second circular hole 232, where the diameter of the first circular hole 231 is smaller than the diameter of the second circular hole 232, and the first circular hole 231 and the second circular hole 232 are arranged alternately. Using first circular holes 231 and second circular holes 232 with different diameters can disperse the crude oil flow, reduce localized impacts, and ensure a more uniform pressure distribution within the horizontal tank 10.

[0052] In some embodiments, such as Figure 1 As shown, the horizontal tank 10 is also provided with an exhaust port 90.

[0053] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of multiple components or the interaction between multiple components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crude oil electro-dehydration device coupling a turbulent field and a non-uniform electric-magnetic field, comprising a horizontal tank (10), characterized in that, It also includes a liquid distribution structure (20) and a demulsification structure (30) that couples the turbulent field with the non-uniform electric-magnetic field; Located inside the horizontal tank (10), the liquid distribution structure (20) and the demulsification structure (30) are provided, with the demulsification structure (30) located above the liquid distribution structure (20); The horizontal tank (10) is provided with an oil outlet (40) at the upper end and a water outlet (50) at the lower end.

2. The crude oil electro-dehydration device coupled with a turbulent field and a non-uniform electric-magnetic field according to claim 1, characterized in that, The demulsification structure (30) includes a first electrode plate (31), a second electrode plate (32), a first rod magnet (33), and a second rod magnet (34). The first electrode plate (31) and the second electrode plate (32) are arranged facing each other, and both the first electrode plate (31) and the second electrode plate (32) are provided with a corrugated structure. The first rod magnet (33) and the second rod magnet (34) are both arranged between the first electrode plate (31) and the second electrode plate (32), with the first rod magnet (33) located at the upper end and the second rod magnet (34) located at the lower end. The first rod magnet (33) and the second rod magnet (34) are staggered, and the polarity of the end of the first rod magnet (33) near the second rod magnet (34) is the same as the polarity of the end of the second rod magnet (34) near the first rod magnet (33).

3. The crude oil electro-dehydration device coupled with a turbulent field and a non-uniform electric-magnetic field according to claim 2, characterized in that, Multiple demulsification structures (30) are provided, and the multiple demulsification structures (30) are evenly distributed.

4. The crude oil electro-dehydration device coupled with a turbulent field and a non-uniform electric-magnetic field according to claim 3, characterized in that, The first electrode plates (31) of the plurality of demulsification structures (30) are connected in series, and the second electrode plates (32) of the plurality of demulsification structures (30) are connected in series.

5. The crude oil electro-dehydration device coupled with a turbulent field and a non-uniform electric-magnetic field according to claim 4, characterized in that, It also includes a high-frequency power supply (70), which is connected to the first electrode plate (31) and the second electrode plate (32).

6. The crude oil electro-dehydration device coupled with a turbulent flow field and a non-uniform electric-magnetic field according to claim 5, characterized in that, It also includes two lead wire insulating rods (80) disposed outside the horizontal tank body (10), and the two lead wire insulating rods (80) are respectively connected to the first electrode plate (31) and the second electrode plate (32).

7. The crude oil electro-dehydration device coupled with a turbulent field and a non-uniform electric-magnetic field according to claim 1, characterized in that, The liquid distribution structure (20) includes an inlet pipe (21) and a distribution pipe (22). One end of the inlet pipe (21) is located outside the horizontal tank (10), and the other end is located inside the horizontal tank (10). The inlet pipe (21) located inside the horizontal tank (10) is connected to the distribution pipe (22). The distribution pipe (22) is provided with a distribution hole (23) facing the side of the horizontal tank (10).

8. The crude oil electro-dehydration device coupled with a turbulent field and a non-uniform electric-magnetic field according to claim 7, characterized in that, The liquid distribution pipe (22) is configured in an H shape, and the H-shaped liquid distribution pipe (22) is provided with liquid distribution holes (23) facing the opposite sides of the horizontal tank (10).

9. The crude oil electro-dehydration device coupled with a turbulent field and a non-uniform electric-magnetic field according to claim 8, characterized in that, The H-shaped liquid distribution pipe (22) is provided in two parts.

10. A crude oil electro-dehydration device coupling a turbulent field and a non-uniform electric-magnetic field according to any one of claims 7-9, characterized in that, The liquid distribution hole (23) includes a first circular hole (231) and a second circular hole (232). The diameter of the first circular hole (231) is smaller than the diameter of the second circular hole (232). The first circular hole (231) and the second circular hole (232) are arranged alternately.

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