A continuous coalescence and separator and a continuous coalescence oil removal device

Abstract

The present application relates to a continuous coalescence and separator and a continuous coalescence oil removal device. The continuous coalescence oil removal device has a continuous coalescence and separator, and the continuous coalescence and separator includes: a plurality of coalescence media, the coalescence media extending along the flow direction of the fluid, the coalescence media being arranged in the same direction and overlapping with a spacing therebetween, and the coalescence media having an inclination angle with respect to the horizontal plane; wherein, the coalescence media includes an upper surface and a lower surface, the upper surface having a plurality of coalescence zones distributed along the flow direction of the fluid, and the lower surface being a lipophilic material; the coalescence media is arranged such that the fluid settles between two coalescence media and forms vortices in each coalescence zone successively in the flow direction, so that small oil droplets coalesce into larger oil droplets in the coalescence zones, and the larger oil droplets float up to the lower surface of the adjacent coalescence media for removal, and the aqueous phase flows from the top to the bottom of the coalescence zone under the action of gravity. The removal of fine oil droplets is achieved, the oil removal efficiency is improved, and the clogging of the coalescence packing is avoided.

Description

Technical Field

[0001] This application relates to the technical field of pressure oil removal for produced water in oil and gas fields, and particularly relates to a continuous coalescence and separator and a continuous coalescence oil removal device. Background Art

[0002] The treatment of produced water in oil and gas fields is one of the important links in the development of oil and gas fields. There are various produced water treatment technologies to meet different water quality requirements. The pressure oil removal technology is one of the widely used technologies. Approximately 20% of the produced water in oil and gas fields currently adopts the pressure oil removal and sedimentation process. It is of great significance to improve the oil removal efficiency of the pressure oil removal process and solve the problems existing in its process production.

[0003] In related technologies, the pressure oil removal process is mainly composed of a coalescence process and a high-efficiency separation process. Its principle is to first carry out packing collision coalescence on the oily sewage to make small oil droplets become larger oil droplets to achieve the goal of easy separation. The subsequent process uses the shallow pond theory to add inclined plates or inclined tubes to reduce the sedimentation distance and increase the sedimentation area. The inventors of this application found that the coalescence packing in related technologies is fibrous material, granular material, etc., and there is a problem of coalescence packing blockage. In addition, the oil removal efficiency of the coalescence process in related technologies is not high. Summary of the Invention

[0004] To solve the above technical problems or at least partially solve the above technical problems, this application provides a continuous coalescence and separator and a continuous coalescence oil removal device.

[0005] In a first aspect, this application provides a continuous coalescence and separator, including: a plurality of coalescence media, the coalescence media extending along the flow direction of the fluid, the plurality of coalescence media being arranged in the same direction and overlapping with a predetermined spacing therebetween, the coalescence media having a preset inclination angle with the horizontal plane, the fluid including an oil phase and a water phase; wherein, the coalescence media includes an upper surface and a lower surface, wherein, the upper surface has a plurality of coalescence zones distributed along the flow direction of the fluid, and the lower surface is a lipophilic material; wherein, the coalescence media is configured to cause the fluid to settle between two coalescence media and form eddies in each coalescence zone successively in the flow direction, so that small oil droplets coalesce into larger oil droplets in the coalescence zones, and the larger oil droplets float to the lower surface of the adjacent coalescence media for removal, and the water phase flows from the top to the bottom of the coalescence zone under the action of gravity.

[0006] In some embodiments, the coalescence zones are formed by baffles arranged on the upper surface, and the baffles extend from the top to the bottom of the coalescence media.

[0007] In some embodiments, the lower surface of the coalescence zone is a smooth plane.

[0008] In some embodiments, the preset inclination angle is the angle between the lower surface of the coalescence zone and the horizontal plane, and the size of this angle is 60°.

[0009] In some embodiments, the spacing between the upper surface of the coalescing medium and the lower surface of the adjacent coalescing medium is L, the depth of the coalescing zone is 2 / 3L, and the width of the coalescing zone is 1.5L.

[0010] In a second aspect, the present application provides a continuous coalescing oil removal device, including: an inlet unit, a rectifying unit, a continuous coalescing and separating device, an oil collecting unit, and an outlet unit. The fluid flows through the continuous coalescing and separating device after being rectified by the rectifying unit. Among them, the continuous coalescing and separating device includes: a plurality of coalescing media, the coalescing media extend along the flow direction of the fluid, the plurality of coalescing media are arranged in the same direction and overlap with a predetermined spacing, the coalescing media have a preset inclination angle with the horizontal plane, and the fluid includes an oil phase and a water phase; among them, the coalescing media include an upper surface and a lower surface, and among them, the upper surface has a plurality of coalescing zones distributed along the flow direction of the fluid, and the lower surface is made of an oil-wetting material; the top of the coalescing zone is communicated with the oil collecting unit, and the bottom of the coalescing zone is communicated with the outlet unit; among them, the coalescing media are arranged such that the fluid settles between two coalescing media and successively forms eddies in each coalescing zone in the flow direction, so that small oil droplets coalesce into larger oil droplets in the coalescing zone, the larger oil droplets float up to the lower surface of the adjacent coalescing medium for removal and enter the oil collecting unit; and the water phase flows from the top to the bottom of the coalescing zone under the action of gravity and is discharged through the outlet unit.

[0011] In some embodiments, the coalescing zone is formed by baffles provided on the upper surface, and the baffles extend from the top to the bottom of the coalescing medium.

[0012] In some embodiments, the lower surface of the coalescing medium is a smooth plane.

[0013] In some embodiments, the preset inclination angle is the angle between the lower surface of the coalescing medium and the horizontal plane, and the magnitude of this angle is 60°.

[0014] In some embodiments, the spacing between the upper surface of the coalescing medium and the lower surface of the adjacent coalescing medium is L, the depth of the coalescing zone is 2 / 3L, and the width of the coalescing zone is 1.5L.

[0015] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0016] The technical solution provided by the embodiment of the present application sets a plurality of coalescing zones distributed along the flow direction of the fluid on the upper surface of the coalescing medium. The plurality of coalescing media are arranged in the same direction and overlap with a predetermined spacing. The fluid forms vortices in each of its coalescing zones successively in the flow direction, so that small oil droplets coalesce into larger oil droplets in the coalescing zones, and the larger oil droplets float to the lower surface of the adjacent coalescing medium for removal, and the aqueous phase flows from the top to the bottom of the coalescing zone under the action of gravity. Thus, by continuous coalescence and separation during coalescence, the removal of fine oil droplets is achieved, thereby improving the oil removal efficiency and avoiding the blockage of the coalescing packing in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a top view of an embodiment of the continuous coalescence and separator provided by the embodiment of the present application;

[0020] Figure 2 is a side view of an embodiment of the continuous coalescence and separator provided by the embodiment of the present application;

[0021] Figure 3 is a structural schematic diagram of an embodiment of the continuous coalescence oil removal device provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of description of the present application, and have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used interchangeably.

[0024] Figure 1 and Figure 2 are respectively a top view and a side view of an embodiment of the continuous coalescence and separator provided by the embodiment of the present application. Refer to Figure 1 and Figure 2As shown, the continuous coalescence and separator 1 of the embodiment of the present application includes: a plurality of coalescing media (marked as 10a, 10b, and 10c in the attached drawings), the coalescing media 10a, 10b, and 10c extend along the fluid flow direction 14, the plurality of coalescing media are arranged overlapping in the same direction and have a predetermined spacing therebetween, and the coalescing media 10a, 10b, and 10c have a preset inclination angle α with the horizontal plane. The coalescing media includes an upper surface 11 and a lower surface 12, wherein the upper surface 11 has a plurality of coalescing zones (marked as 13a to 13k in the attached drawings) distributed along the fluid flow direction 14, and the lower surface 12 is made of an oil-wetting material.

[0025] In the embodiment of the present application, the coalescing media causes the fluid to settle between two coalescing media and form eddies 15 in its respective coalescing zones successively in the flow direction 14, so that small oil droplets coalesce in the coalescing zones to form larger oil droplets, and the larger oil droplets float up to the lower surface 12 of the adjacent coalescing media for removal, and the aqueous phase flows from the top 131 to the bottom 132 of the coalescing zone under the action of gravity. Refer to Figure 1 and Figure 2 As shown, the fluid coalesces in the plurality of coalescing zones 13a to 13k of the coalescing media 10b to form larger oil droplets, and the oil droplets float up to the lower surface 12 of the coalescing media 10a for removal.

[0026] It should be noted that the coalescing media are shown as 10a, 10b, and 10c in Figure 1 and Figure 2 , and the coalescing zones are shown as 13a to 13k in Figure 1 and Figure 2 . Without special instructions, the coalescing media refers to at least one of 10a, 10b, and 10c, and the coalescing zone refers to at least one of 13a to 13k. It should be understood that although Figure 1 and Figure 2 show a specific number of coalescing media and coalescing zones, this is not a limitation on their number. In the embodiment of the present application, there may be more or fewer coalescing media and coalescing zones, and the embodiment of the present application does not limit this.

[0027] In some embodiments, the fluid is oily sewage, wherein the oily sewage includes a certain amount of crude oil and other impurities. In some embodiments, the fluid includes an oil phase and an aqueous phase. In some embodiments, the fluid also contains solid particles such as sediment.

[0028] In some embodiments, the coalescing media 10a, 10b, and 10c are plate-shaped and extend along the fluid flow direction to form a continuous coalescence and separation section from the upstream to the downstream of the fluid.

[0029] In the embodiments of the present application, the depth of the coalescing zone is H, the width is S, and the length is M. Among them, the depth H is the length in the vertical direction of the upper surface 11, the width S is the length in the flow direction of the fluid, and the length M is the length from the top to the bottom of the coalescing zone. In some embodiments, the direction from the top to the bottom of the coalescing zone is perpendicular to the flow direction 14 of the fluid, but is not limited thereto.

[0030] In some embodiments, the coalescing zone is formed by a baffle 111 provided on the upper surface 11, and the baffle 111 extends from the top 131 to the bottom 132 of the coalescing medium. In some embodiments, the top 131 and / or the bottom 132 of the coalescing zone are openings. The coalescing zone is a space with a rectangular cross-section. It should be understood that the embodiments of the present application are not limited thereto, and spaces of other shapes are also feasible, as long as there is a space with a certain depth on the upper surface 11 of the coalescing medium can be conceived.

[0031] In some embodiments, the lower surface 12 of the coalescing medium is a smooth plane.

[0032] In some embodiments, the predetermined inclination angle is the angle α between the lower surface 12 of the coalescing medium and the horizontal plane, and the magnitude of the angle α is 60°.

[0033] In some embodiments, refer to Figure 1 and Figure 2 As shown, the distance between the upper surface 11 of the coalescing medium and the lower surface 12 of the adjacent coalescing medium is L, the depth H of the coalescing zone is 2 / 3L, and the width S of the coalescing zone is 1.5L.

[0034] Figure 3 The structural schematic diagram of an embodiment of the continuous coalescing oil removal device according to the embodiments of the present application is shown. Refer to Figure 3 As shown, taking the horizontal pressure coalescing oil removal device as an example, in combination with Figures 1 to 3 the continuous coalescing oil removal device according to the embodiments of the present application will be described.

[0035] Refer to Figure 3 As shown, the continuous coalescing oil removal device 100 according to the embodiments of the present application includes a continuous coalescing and separator 1 (refer to Figure 1 and Figure 2 shown): an inlet unit 2, a rectifying unit 3, an oil collecting unit 4, and an outlet unit 5. The fluid flows through the continuous coalescing and separator 1 after being rectified by the rectifying unit 3. The oil and water are separated by the continuous coalescing and separator 1. The water phase enters the outlet unit 5, and the oil phase enters the oil collecting unit 4.

[0036] In some embodiments, the fluid further includes other impurities (such as sediment, etc.). Refer to Figure 3 As shown, the continuous coalescing oil removal device further includes a sludge collecting unit 6. In some embodiments, refer to Figure 3As shown, an effluent baffle 7 is provided between the sludge collection unit 6 and the effluent unit 5.

[0037] In some embodiments, referring to Figure 3 As shown, the oil collection unit 4 is provided at the top of the continuous coalescence oil removal device 100, and the effluent unit 5 and the sludge collection unit 6 are provided at the bottom of the continuous coalescence oil removal device 100. The effluent unit 5 is provided downstream of the continuous coalescence and separator 1. The effluent baffle 7 is provided between the effluent unit 5 and the sludge collection unit 6.

[0038] Referring to Figures 1 to 3 As shown, in the continuous coalescence and separator 1, the coalescing medium is arranged such that the fluid settles between the two coalescing media and vortices 15 are successively formed in its respective coalescence zones 13a to 13k in the flow direction 14, so that small oil droplets coalesce in the coalescence zones to form larger oil droplets, and the larger oil droplets float up to the lower surface 12 of the adjacent coalescing medium for removal, and the aqueous phase flows from the top 131 to the bottom 132 of the coalescence zone under the action of gravity. Referring to Figure 1 and Figure 2 As shown, the fluid coalesces in the multiple coalescence zones of the coalescing medium 10b to form larger oil droplets, and the oil droplets float up to the lower surface 12 of the coalescing medium 10a for removal and enter the oil collection unit 4; and the aqueous phase flows from the top 131 to the bottom 132 of the coalescence zone under the action of gravity and is discharged through the effluent unit 5.

[0039] It should be understood that the continuous coalescence and separator 1 is as described above in this article and will not be elaborated here.

[0040] In some embodiments, the inlet unit 2 is a baffle type inlet or a butterfly inlet, which is not limited in the embodiments of the present application, and the inlet unit 2 can refer to the related art.

[0041] In some embodiments, the rectifying unit 3 is arranged to stabilize the fluid flow pattern and eliminate or mitigate the phenomena of channeling, short-circuit flow and vortex flow in the flow field. The rectifying unit 3 is of a grid type or a perforated plate type, which is not limited in the embodiments of the present application.

[0042] In some embodiments, the continuous coalescence oil removal device 100 or its continuous coalescence and separator 1 adopts a non-metallic corrosion-resistant material to ensure the service life and provide technical support for the treatment of produced water in oil and gas fields.

[0043] Through the embodiments of the present application, a plurality of coalescing zones distributed along the flow direction of the fluid are arranged on the upper surface of the coalescing medium. The plurality of coalescing media are arranged in the same direction and overlap with a predetermined spacing. The fluid forms vortices in each of its coalescing zones successively in the flow direction, so that small oil droplets coalesce into larger oil droplets in the coalescing zones. The larger oil droplets float to the lower surface of the adjacent coalescing medium for removal, and the aqueous phase flows from the top to the bottom of the coalescing zone under the action of gravity. Thus, by continuous coalescence and separation while coalescing, the removal of fine oil droplets is achieved, thereby improving the oil removal efficiency and avoiding the blockage of the coalescing packing in the related art.

[0044] The technical solution of the embodiments of the present application adopts continuous coalescence, continuous oil removal technology and all-non-metallic materials to solve problems such as blockage of coalescing packing, equipment corrosion and poor impact resistance in the treatment of produced water in oil and gas fields. At the same time, the oil removal efficiency is improved, reaching more than 95%. It has good application prospects and good economic benefits in the field of produced water in oil and gas fields.

[0045] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0046] The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages and disadvantages of the embodiments.

[0047] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims. All of these are within the protection scope of the present application.

Claims

1. A continuous coalescer and separator, characterized in that, Comprising: A plurality of coalescing media, the coalescing media being plate-shaped and extending along the flow direction of the fluid. The plurality of coalescing media are arranged overlapping in the same direction with a predetermined spacing therebetween. The coalescing media have a preset inclination angle with respect to the horizontal plane. The fluid includes an oil phase and a water phase; Wherein, the coalescing media include an upper surface and a lower surface. Among them, the upper surface has a plurality of coalescing zones distributed along the flow direction of the fluid. The coalescing zones are formed by baffles provided on the upper surface. The baffles extend from the top to the bottom of the coalescing media. The top and bottom of the coalescing zones are open, and the lower surface is a smooth plane and made of an oil-wetting material; Wherein, the coalescing media are arranged such that the fluid settles between two coalescing media and vortices are successively formed in each of the coalescing zones in the flow direction, so that small oil droplets coalesce into larger oil droplets in the coalescing zones. The larger oil droplets float up to the lower surface of the adjacent coalescing media for removal, and the water phase flows from the top to the bottom of the coalescing zone under the action of gravity.

2. The continuous coalescence and separator according to claim 1, characterized in that, The preset inclination angle is the angle between the lower surface and the horizontal plane, and the magnitude of the angle is 60°.

3. The continuous coalescence and separator according to claim 1, characterized in that, The spacing between the upper surface of the coalescing media and the lower surface of the adjacent coalescing media is L, the depth of the coalescing zone is 2 / 3L, and the width of the coalescing zone is 1.5L.

4. A continuous coalescence oil removal device, characterized in that, Comprising: An inlet unit, a rectifying unit, a continuous coalescing and separating device, an oil collecting unit and an effluent unit. The fluid flows through the continuous coalescing and separating device after being rectified by the rectifying unit. Among them, the continuous coalescing and separating device includes: A plurality of coalescing media, the coalescing media being plate-shaped and extending along the flow direction of the fluid. The plurality of coalescing media are arranged overlapping in the same direction with a predetermined spacing therebetween. The coalescing media have a preset inclination angle with respect to the horizontal plane. The fluid includes an oil phase and a water phase; Wherein, the coalescing media include an upper surface and a lower surface. Among them, the upper surface has a plurality of coalescing zones distributed along the flow direction of the fluid. The coalescing zones are formed by baffles provided on the upper surface. The baffles extend from the top to the bottom of the coalescing media. The top and bottom of the coalescing zones are open, and the lower surface is a smooth plane and made of an oil-wetting material; The top of the coalescing zone is communicated with the oil collecting unit, and the bottom of the coalescing zone is communicated with the effluent unit; Wherein, the coalescing media are arranged such that the fluid settles between two coalescing media and vortices are successively formed in each of the coalescing zones in the flow direction, so that small oil droplets coalesce into larger oil droplets in the coalescing zones. The larger oil droplets float up to the lower surface of the adjacent coalescing media for removal and enter the oil collecting unit; and the water phase flows from the top to the bottom of the coalescing zone under the action of gravity and is discharged through the effluent unit.

5. The continuous coalescence oil removal device according to claim 4, characterized in that, The preset inclination angle is the angle between the lower surface and the horizontal plane, and the magnitude of the angle is 60°.

6. The continuous coalescence oil removal device according to claim 4, characterized in that, The spacing between the upper surface of the coalescing media and the lower surface of the adjacent coalescing media is L, the depth of the coalescing zone is 2 / 3L, and the width of the coalescing zone is 1.5L.

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