Devices for treating oilfield water

Abstract

The present disclosure relates to the field of oil-water separation, and a device for treating oilfield water includes a shell, a first wire mesh layer and a second wire mesh layer. The first wire mesh layer is arranged in the shell, and includes a first wire mesh structure formed by interweaving oleophilic and hydrophobic wires and hydrophilic and oleophobic wires; wherein the interweaving points of the oleophilic and hydrophobic wires and the hydrophilic and oleophobic wires form an oil gathering position, and the second wire mesh layer is directly connected to the rear stage of the first wire mesh layer, and is arranged in the shell, and includes a second wire mesh structure formed by interweaving oleophilic and hydrophobic wires and hydrophilic and oleophobic wires, and the mesh aperture of the second wire mesh structure is larger than that of the first wire mesh structure; the height of the second wire mesh layer is greater than the thickness of the second wire mesh layer, and the mesh aperture of the second wire mesh layer is oriented in the up and down directions. The device for treating oilfield water disclosed in the present disclosure has a simple structure, low cost and is conducive to improving the oil recovery rate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oilfield water treatment, and in particular to a device for treating oilfield water. Background Art

[0002] A large amount of oilfield water is produced during oilfield exploitation. The oil content in the oilfield water is low, and the oil particles are very fine, making it difficult to remove from the water by simple gravity separation.

[0003] In the related art, gas flotation equipment is used to treat oilfield water, and the bubbles blown by the gas flotation equipment make the oil float on the water surface as much as possible before collecting the oil. However, the gas flotation equipment has a complex structure, high energy consumption and high cost during operation, and if the gas flotation equipment is not used, the oil recovery rate is low. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present disclosure is to provide a device for treating oilfield water, which has a simple structure, low cost and is conducive to improving the oil recovery rate.

[0005] The present disclosure provides a filler for treating oilfield water, comprising: a first mesh layer, comprising a first mesh structure formed by interweaving oleophilic hydrophobic threads and hydrophilic oleophobic threads; wherein the interweaving points of the oleophilic hydrophobic threads and the hydrophilic oleophobic threads form oil-collecting locations.

[0006] According to some embodiments provided by the present disclosure, the second wire mesh layer is connected to the rear stage of the first wire mesh layer, and includes a second wire mesh structure formed by interweaving oleophilic and hydrophobic wires and hydrophilic and oleophobic wires, and the mesh aperture of the second wire mesh structure is larger than that of the first wire mesh structure.

[0007] According to some embodiments provided by the present disclosure, the material used to make the oleophilic and hydrophobic silk thread includes polypropylene or modified polypropylene, and the material used to make the hydrophilic and oleophobic silk thread includes stainless steel.

[0008] According to some embodiments provided by the present disclosure, the height of the second wire mesh layer is greater than the thickness of the second wire mesh layer, and the mesh holes of the second wire mesh layer are oriented in the up and down directions.

[0009] According to some embodiments provided by the present disclosure, it also includes: a filter layer connected to the front stage of the first wire mesh layer.

[0010] According to some embodiments provided by the present disclosure, the filter layer is detachably connected to the first wire mesh layer.

[0011] According to some embodiments provided by the present disclosure, the filter layer includes a metal wire mesh formed by interweaving metal wires.

[0012] The present disclosure also provides an apparatus for treating oilfield water, comprising: a shell having a treatment chamber provided therein, a water inlet hole connected to the treatment chamber provided at one end, an oil discharge hole and a water drain hole connected to the treatment chamber provided at the other end, and the oil discharge hole being located above the water drain hole; and a filler for treating oilfield water as described above, being arranged between the oil discharge hole and the water drain hole in the treatment chamber.

[0013] According to some embodiments provided in the present disclosure, a first drain hole communicating with the processing chamber is provided at the bottom of the shell, and the first drain hole is arranged at the front stage of the filler for treating oilfield water.

[0014] According to some embodiments provided by the present disclosure, it also includes: a diverter, which is arranged in the processing chamber and is located between the water inlet and the filler for treating oilfield water, and forms a plurality of diverter ports distributed at intervals. Beneficial Effects

[0015] (1) The device for treating oilfield water disclosed in the present invention has a simple structure, low cost and is conducive to improving the oil recovery rate.

[0016] (2) The device for treating oilfield water disclosed in the present invention is difficult to be clogged and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the arrangement of the packing for treating oilfield water according to an embodiment of the present disclosure.

[0018] Figure 2 It is a schematic diagram of a part of the structure of a packing used to treat oilfield water.

[0019] Figure 3 It is a schematic diagram of the structure of the equipment for treating oilfield water according to an embodiment of the present disclosure.

[0020] Reference numerals:

[0021] 100. Filler;

[0022] 11. first silk screen layer; 111. oleophilic and hydrophobic silk threads; 112. hydrophilic and oleophobic silk threads; 113. interlacing points;

[0023] 12. Second screen layer;

[0024] 13. Filter layer;

[0025] 800, shell; 8101, processing chamber; 8102, water inlet hole; 8103, oil drain hole; 8104, drain hole; 8105, first sewage drain hole; 8106, second sewage drain hole; 82, sewage collecting pipe; 83, diverter;

[0026] 900. Oil drops. DETAILED DESCRIPTION

[0027] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0028] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0029] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0031] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0032] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0033] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0034] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0035] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0036] In the related art, gas flotation equipment is used to treat the oil field water generated during oil field exploitation. The bubbles blown by the gas flotation equipment make the oil as much as possible float on the water surface before collecting the oil. However, the gas flotation equipment has a complex structure, high energy consumption and high cost during operation. If the gas flotation equipment is not used, the oil recovery rate is low.

[0037] In view of this, the present disclosure provides a packing for treating oilfield water, wherein the packing for treating oilfield water has a simple structure, low cost and is conducive to improving oil recovery rate.

[0038] Figure 1 It is a schematic diagram of the arrangement of the packing for treating oilfield water according to an embodiment of the present disclosure. Figure 2This is a schematic diagram of part of the structure of the packing used to treat oilfield water. Figure 1 and Figure 2 The filler 100 for oilfield water disclosed in the present invention comprises a first mesh layer 11. The first mesh layer 11 comprises a first mesh structure formed by interweaving oleophilic and hydrophobic threads 111 and hydrophilic and oleophobic threads 112. The interweaving points 113 of the oleophilic and hydrophobic threads 111 and the hydrophilic and oleophobic threads 112 form oil-collecting positions.

[0039] Optionally, the interweaving can be formed by weaving, and the weaving process is mature and convenient to manufacture. The oleophilic and hydrophobic silk threads 111 and the hydrophilic and oleophobic silk threads 112 are woven to form a grid structure, and the interweaving of the oleophilic and hydrophobic silk threads 111 and the hydrophilic and oleophobic silk threads 112 forms an oil collection point. The present disclosure does not limit the weaving structure and the specific shape after weaving. The grid fillers interwoven by weaving the oleophilic and hydrophobic silk threads 111 and the hydrophilic and oleophobic silk threads 112 are all within the scope of protection of the present disclosure.

[0040] Optionally, the material of the oleophilic and hydrophobic silk thread 111 includes polypropylene or modified polypropylene. The polypropylene material has good oleophilic and hydrophobic properties, and fine oil droplets 900 can spread on the surface of the polypropylene material and be adsorbed by the polypropylene material. In addition, the present disclosure preferably uses modified polypropylene with enhanced mechanical properties after modification. The modified polypropylene has enhanced mechanical properties and is difficult to break during the interweaving process with the hydrophilic and oleophobic silk thread 112, making the first screen layer 11 easy to process and manufacture.

[0041] Optionally, the material of the hydrophilic and oleophobic threads 112 includes stainless steel. The stainless steel has hydrophilic and oleophobic properties, repels the fine oil droplets 900, and can demulsify a small amount of emulsified oil and water, so that the fine oil droplets 900 are squeezed out of the water package and rush to the oleophilic and hydrophobic threads 111, so that the fine oil droplets 900 gather and combine at the oleophilic and hydrophobic threads 111. At the same time, the stainless steel has good mechanical properties and is difficult to break during the interweaving process with the hydrophilic and oleophobic threads 112, making the first wire mesh layer 11 easy to process and manufacture. The stainless steel is also highly resistant to corrosion and is difficult to rust and damage during the process of treating oilfield water, which is conducive to improving the service life of the first wire mesh layer 11.

[0042] Therefore, when the oilfield water passes through the filler 100 for treating oilfield water, the oleophilic and hydrophobic threads 111 have oleophilicity, and the oleophilic and hydrophobic threads 111 absorb the fine oil droplets 900. Since the hydrophilic and hydrophobic threads 112 have hydrophilic and oleophobic properties, the hydrophilic and oleophobic threads 112 repel the fine oil droplets 900, demulsifying a small amount of emulsified oil and water, so that the fine oil droplets 900 are squeezed out from the water and rush to the oleophilic and hydrophobic threads 111. In other words, the oleophilic and hydrophobic threads 111 and the hydrophilic and oleophobic threads 112 have a one-attractive and one-repellent effect on the fine oil droplets 900, so that the fine oil droplets 900 can quickly and efficiently gather at the intersection of the hydrophilic and oleophobic threads 112 and the oleophilic and hydrophobic threads 111, and aggregate into large-sized oil droplets 900 at the intersection points 113, thereby enabling the first mesh layer 11 to aggregate the fine oil droplets 900. In other words, when the oilfield water flows through the first wire mesh layer 11, the first wire mesh layer 11 collides with and intercepts the oilfield water, and can adhere to and agglomerate the fine oil with a low content in the oilfield water, so that the fine oil droplets 900 in the oilfield water are continuously agglomerated to form large-sized oil droplets 900, thereby exerting a high-efficiency oil-water agglomeration and separation effect, and then the oilfield water leaves the first wire mesh layer 11 under the drag of the continuous phase flow, and the large-sized oil droplets 900 also leave the adhered first wire mesh layer 11. There will be more large-sized oil droplets 900 that can float to the surface of the water under the action of buoyancy, so that the amount of oil floating to the surface of the water is larger, which is beneficial to improve the oil recovery rate, and the filler 100 for treating oilfield water has a simple structure, does not require additional driving energy during operation, and has low cost.

[0043] Optionally, the second screen layer 12 is arranged at the rear stage of the first screen layer 11, and the second screen layer 12 includes a second screen structure formed by interweaving oleophilic and hydrophobic silk threads 111 and hydrophilic and oleophobic silk threads 112, and the mesh aperture of the second screen structure is larger than that of the first screen structure. It is understandable that the mesh structure of the first screen structure and the mesh structure of the second screen structure and the shape of the second screen layer 12 and the first screen layer 11 can be the same or different, and can be adaptively changed according to needs. However, compared with the first screen layer 11, the wire arrangement of the second screen layer 12 is relatively sparse, and the spacing between adjacent wires is larger.

[0044] Thus, when the oilfield water passes through the filler 100 for treating oilfield water, the oilfield water first passes through the first wire mesh layer 11 and then passes through the second wire mesh layer 12. Since the mesh aperture of the second wire mesh layer 12 is larger than that of the first wire mesh layer 11, the oilfield water passes through the second wire mesh layer 12 in the flow direction (for example, Figure 1The disturbance received when the oil flows in the direction from left to right in the vertical direction is small, and the resistance in the up and down directions is also low, so that the large-sized oil droplets formed by the first wire mesh layer 11 are easily captured and aggregated again at this layer and easily separated by gravity, that is, the water with high density sinks, and the large-sized and low-density oil droplets float, and the oil and water flow smoothly, and the required residence time is short.

[0045] Optionally, the height of the second wire mesh layer 12 is greater than the thickness of the second wire mesh layer 12, and the mesh holes of the second wire mesh layer 12 face the up-down direction. Thus, when the oilfield water flows away from the first wire mesh layer 11 and is gravity-separated in the up-down direction, that is, the water flows downward and the large-sized oil flows upward, the second wire mesh layer 12 can better capture the condensed large-sized oil, and the large-sized oil and water can flow and separate more smoothly in the up-down direction.

[0046] Optionally, see Figure 1 The filler 100 for oilfield water further includes a filter layer 13. The filter layer 13 is connected to the front stage of the first wire mesh layer 11. Therefore, before the oilfield water passes through the first wire mesh layer 11, it will first pass through the filter layer 13, and the filter layer 13 will first intercept and filter the solid impurities in the oilfield water, reducing the risk of clogging of the first wire mesh layer 11, which is conducive to extending the service life of the first wire mesh layer 11.

[0047] Optionally, the filter layer 13 is detachably connected to the first wire mesh layer 11, and the filter layer 13 comprises a metal wire mesh. Thus, the filter layer 13 has high strength, is convenient for online backwashing, and is convenient for removal and separate cleaning. Specifically, the metal wire mesh is made of stainless steel wire. In other words, the metal wire mesh is formed by winding and interweaving stainless steel wires, has strong corrosion resistance, high strength, and is not easy to damage.

[0048] Optionally, the thickness of the first wire mesh layer 11 is greater than the thickness of the second wire mesh layer 12, and the thickness of the second wire mesh layer 12 is greater than the thickness of the filter layer 13. For example, the thickness of the filter layer 13 is 80 mm to 150 mm, the thickness of the first wire mesh layer 11 is 400 mm to 800 mm, and the thickness of the second wire mesh layer 12 is 200 mm to 300 mm. As a result, when the oilfield water flows through, the filter layer 13 with a small thickness will first intercept the solid impurities in the oilfield water, and because the filter layer 13 has a small thickness and a small volume, it is easy to disassemble and separate from the first wire mesh layer 11 and convenient for washing. Then, when the oilfield water leaves the filter layer 13 and passes through the first wire mesh layer 11 with a larger thickness, the flow path of the oilfield water is long, and fine oil can be better coalesced. Finally, when the oilfield water leaves the first wire mesh layer 11 and passes through the second wire mesh layer 12 with a medium thickness, the second wire mesh layer 12 with a medium thickness can further coalesce the large-sized oil and the oil and water are easily separated by gravity. Meanwhile, it can be understood that the thicknesses of the first wire mesh layer 11, the second wire mesh layer 12 and the filter layer 13 of the embodiment of the present disclosure include but are not limited to these and can be adaptively changed.

[0049] Figure 3 Schematic diagram of the structure of the equipment for treating oilfield water according to the embodiment of the present disclosure. Figure 2 and Figure 3 The equipment for treating oilfield water comprises a housing 800 and the filler 100 for treating oilfield water as described above. A treatment chamber 8101 is provided in the housing 800, a water inlet 8102 is provided at one end of the housing 800, and an oil discharge hole 8103 and a water discharge hole 8104 communicating with the treatment chamber 8101 are provided at the other end. The oil discharge hole 8103 is located above the water discharge hole 8104. The filler 100 for treating oilfield water is provided between the oil discharge hole 8103 and the water discharge hole 8104 in the treatment chamber 8101.

[0050] Therefore, after the oilfield water enters the shell 800 through the water inlet hole 8102, when the oilfield water flows from one end of the shell 800 to the other end of the shell 800, when the first wire mesh layer 11 contacts the fine oil, it will intercept, adhere and agglomerate the fine oil, so that the fine oil will quickly and efficiently condense at the interweaving point 113 to form large-sized oil droplets 900. After the large-sized oil droplets 900 that have aggregated and grown leave the first wire mesh layer 11 to which they are attached under the action of buoyancy and the drag of the continuous phase flow, more large-sized oil will float to the surface of the water, so that the oil can be discharged through the oil discharge hole 8103 and the water can be discharged through the drainage hole 8104, thereby realizing efficient separation of oil and water and a high oil recovery rate.

[0051] Optionally, a first drain hole 8105 communicating with the processing chamber 8101 is provided at the bottom of the housing 800, and the first drain hole 8105 is provided at the front stage of the packing 100 for treating oilfield water. Thus, before the oilfield water flows into the packing 100 for treating oilfield water, solid impurities in the oilfield water can fall down and be discharged through the first drain hole 8105, which is conducive to avoiding blockage of the packing 100 for treating oilfield water and reducing the impact load borne by the packing 100.

[0052] Optionally, a second drain hole 8106 communicating with the processing chamber 8101 is provided at the bottom of the shell 800, and the second drain hole 8106 is arranged corresponding to the bottom of the first wire mesh layer 11, so as to facilitate further discharge of solid impurities.

[0053] Optionally, the equipment for treating oilfield water further comprises a sewage collecting pipe 82. The sewage collecting pipe 82 is respectively connected to the first sewage discharge hole 8105 and the second sewage discharge hole 8106, and is connected to the outside, which is conducive to the centralized discharge of solid impurities.

[0054] Optionally, the device for treating oilfield water further includes a flow divider 83. The flow divider 83 is arranged in the treatment chamber and is located between the water inlet 8102 and the filler 100 for treating oilfield water, and forms a plurality of flow dividers distributed at intervals. Thus, the oilfield water will be diverted through the plurality of flow dividers of the flow divider 83 and then pass through the area where the filler 100 for treating oilfield water is located. The flow divider 83 can prevent a large range of turbulence from occurring when the oilfield water passes through the filler 100, so that the oilfield water can flow to the filler 100 more steadily and evenly, which is beneficial to reducing the impact of the oilfield water on the filler 100 and is beneficial to the filler 100 to better separate oil and water.

[0055] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A device for treating oilfield water, characterized in that: include: A shell body, in which a processing chamber is provided, and a water inlet hole communicating with the processing chamber is provided at one end, and an oil drain hole and a water drain hole communicating with the processing chamber are provided at the other end, and the oil drain hole is located above the water drain hole; A first mesh layer is disposed in the processing chamber and between the oil drain hole and the water drain hole, and includes a first mesh structure formed by interweaving oleophilic and hydrophobic threads and hydrophilic and oleophobic threads; wherein the interweaving points of the oleophilic and hydrophobic threads and the hydrophilic and oleophobic threads form oil collecting positions; a second wire mesh layer, directly connected to the rear stage of the first wire mesh layer, and arranged between the oil drainage hole and the water drainage hole, and comprising a second wire mesh structure formed by interweaving oleophilic and hydrophobic wires and hydrophilic and oleophobic wires, and the mesh aperture of the second wire mesh structure is larger than that of the first wire mesh structure; the height of the second wire mesh layer is larger than the thickness of the second wire mesh layer, and the mesh aperture of the second wire mesh layer is oriented in the up and down direction; the material of the oleophilic and hydrophobic wires comprises polypropylene or modified polypropylene, and the material of the hydrophilic and oleophobic wires comprises stainless steel; The filter layer is directly connected to the front stage of the first wire mesh layer, and the filter layer comprises a wire mesh formed by interweaving stainless steel wires.

2. The device for treating oilfield water according to claim 1, characterized in that: The filter layer is detachably connected to the first wire mesh layer.

3. The device for treating oilfield water according to claim 1, characterized in that: A first drain hole communicating with the processing chamber is provided at the bottom of the shell body, and the first drain hole is arranged in the front stage of the filler for processing oilfield water.

4. The device for treating oilfield water according to claim 1, characterized in that: Also includes: The flow dividing member is arranged in the processing chamber and is located between the water inlet hole and the first wire mesh layer, and forms a plurality of flow dividing openings which are distributed at intervals.

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