CN215798863U - Fracturing flow-back water treatment system - Google Patents
Fracturing flow-back water treatment system Download PDFInfo
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- CN215798863U CN215798863U CN202121459479.7U CN202121459479U CN215798863U CN 215798863 U CN215798863 U CN 215798863U CN 202121459479 U CN202121459479 U CN 202121459479U CN 215798863 U CN215798863 U CN 215798863U
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Abstract
The utility model relates to a fracturing flow-back water treatment system, which comprises a coagulating sedimentation tank, a solid-liquid separation device, an oil-water separation membrane device, a deep oxidation device and a nanofiltration membrane device, wherein the output end of the coagulating sedimentation tank is connected with the input end of the solid-liquid separation device, the output end of the solid-liquid separation device is connected with the input end of the oil-water separation membrane device, the solid-liquid separation device separates suspended flocculate and precipitate, the separated water solution enters an oil-water separation membrane device, the output end of the oil-water separation membrane device is connected with the input end of the deep oxidation device, the output end of the deep oxidation device is connected with the nanofiltration membrane device, water which permeates through a membrane after being filtered by the oil-water separation membrane device enters the deep oxidation device and is oxidized in the deep oxidation device, and finally, the produced water is directly discharged or recycled; the method has the advantages of short flow, high oil-water separation efficiency and high quality of produced water, is suitable for high-oil-content return drainage, and can treat non-standard return drainage to realize standard discharge.
Description
[ technical field ]
The utility model relates to the technical field of wastewater treatment systems, in particular to a fracturing flow-back water treatment system.
[ background art ]
The oil production can be effectively improved through a fracturing mode, in order to improve the permeability of the stratum, a fracturing fluid needs to be added, and the fracturing flow-back fluid is the wastewater of the fracturing operation which flows back to the ground from the stratum. The fracturing flow-back fluid has high oil content, repeated chemical components, high COD and suspended matter content and high treatment difficulty.
Although the prior patent (CN204644001U) describes a flowback liquid treatment system suitable for high COD and high gas content, the device comprises an oil-containing flocculation degreasing unit, a first filter pressing unit, a first oxidation degradation unit, a first sedimentation unit, a second filter pressing unit, a second oxidation degradation unit, a second filter pressing unit, a third filter pressing unit and a deep oxidation unit. The patent (204151171U) provides a fracturing flow-back fluid treatment and discharge device, which consists of a regulating reservoir, an oil separation reservoir, a deep oxidation device, a membrane pool and a water quality detection device. The patent (CN212127914U) discloses a harmless treatment system for fracturing return water, and the deodorization rate reaches 99%.
However, the existing treatment technology often contains a plurality of repeating units, the process is more, and the method is difficult to be applied to the high-oil-content return liquid or difficult to effectively separate oil in the wastewater, so that the next separation process is influenced, and the overall equipment efficiency is low. Therefore, a fracturing flow-back fluid treatment series with short flow, high water quality of produced water and high oil-water separation efficiency is needed.
[ contents of utility model ]
The utility model aims to solve the defects and provide a fracturing flow-back water treatment system which is short in flow, high in oil-water separation efficiency, high in water quality of produced water, suitable for flow-back water with high oil content, capable of treating non-standard flow-back water, achieving standard discharge, protecting the environment and preventing secondary pollution.
In order to realize the purpose, the fracturing flow-back water treatment system comprises a coagulating sedimentation tank 1, a solid-liquid separation device 2, an oil-water separation membrane device 3, a deep oxidation device 4 and a nanofiltration membrane device 5, wherein the input end of the coagulating sedimentation tank 1 is connected with a fracturing flow-back water conveying pipe through a pipeline, the output end of the coagulating sedimentation tank 1 is connected with the input end of the solid-liquid separation device 2, the output end of the solid-liquid separation device 2 is connected with the input end of the oil-water separation membrane device 3, the solid-liquid separation device 2 separates suspended flocculate and precipitate, the separated water solution enters the oil-water separation membrane device 3, the output end of the oil-water separation membrane device 3 is connected with the input end of the deep oxidation device 4, the output end of the deep oxidation device 4 is connected with the nanofiltration membrane device 5, and the water which permeates through the membrane after being filtered by the oil-water separation membrane device 3 enters the deep oxidation device 4, and oxidizing in a deep oxidation device 4, and introducing into a nanofiltration membrane device 5 after oxidation, wherein the nanofiltration membrane device 5 is provided with a water outlet, and the produced water 6 passing through the water outlet is directly discharged or recycled.
Preferably, the oil-water separation membrane device 3 is connected to the coagulation sedimentation tank 1 through a pipeline I, and the oil phase trapped by the membrane in the wastewater in the oil-water separation membrane device 3 is returned to the coagulation sedimentation tank 1 through the pipeline I for further treatment.
Preferably, an oil discharge valve 7 is installed on the first pipeline between the oil-water separation membrane device 3 and the coagulation sedimentation tank 1, the oil phase trapped in the oil-water separation membrane device 3 is discharged through the oil discharge valve 7 when the oil phase reaches an emulsified oil state, and water in the discharged liquid flows back to the coagulation sedimentation tank 1 through the first pipeline.
Preferably, the nanofiltration membrane device 5 is connected to the coagulative precipitation tank 1 through a second pipeline, and concentrated water generated in the nanofiltration membrane device 5 flows back to the coagulative precipitation tank 1 through the second pipeline for further recycling treatment.
Preferably, the oil-water separation membrane used in the oil-water separation membrane device 3 is a flat membrane or a hollow fiber membrane having a hydrophilic coating on the surface.
Preferably, the membrane module of the oil-water separation membrane device 3 is any one of a flat membrane module, a hollow fiber membrane module, and a spiral membrane module.
Preferably, the deep oxidation device 4 is any one or more of an ozone oxidation device, a micro-nano bubble device and an ultraviolet oxidation treatment device.
Compared with the prior art, the utility model provides a fracturing return drainage treatment system consisting of a coagulating sedimentation tank, a solid-liquid separation device, an oil-water separation membrane device, a deep oxidation device and a nanofiltration membrane device, the system has the advantages of short flow, simple structure, easy control, high oil-water separation efficiency and high water quality of produced water, is suitable for return drainage with high oil content, can treat non-standard return drainage, realizes standard discharge, protects the environment, prevents and controls secondary pollution, and is worthy of popularization and application.
[ description of the drawings ]
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. a coagulating sedimentation tank 2, a solid-liquid separation device 3, an oil-water separation membrane device 4, a deep oxidation device 5, a nanofiltration membrane device 6, produced water 7 and an oil discharge valve.
[ detailed description of the utility model ]
The utility model is further described below with reference to the accompanying drawings:
as shown in the attached figure 1, the utility model provides a fracturing flow-back water treatment system, which comprises a coagulating sedimentation tank 1, a solid-liquid separation device 2, an oil-water separation membrane device 3, a deep oxidation device 4 and a nanofiltration membrane device 5, wherein the input end of the coagulating sedimentation tank 1 is connected with a fracturing flow-back water conveying pipe through a pipeline, the output end of the coagulating sedimentation tank 1 is connected with the input end of the solid-liquid separation device 2, the output end of the solid-liquid separation device 2 is connected with the input end of the oil-water separation membrane device 3, the solid-liquid separation device 2 separates suspended flocculate and precipitate, the separated water solution enters the oil-water separation membrane device 3, the output end of the oil-water separation membrane device 3 is connected with the input end of the deep oxidation device 4, the output end of the deep oxidation device 4 is connected with the nanofiltration membrane device 5, and the water which permeates through the membrane after being filtered by the oil-water separation membrane device 3 enters the deep oxidation device 4, and oxidizing in a deep oxidation device 4, feeding the oxidized water into a nanofiltration membrane device 5, wherein a water outlet is arranged on the nanofiltration membrane device 5, and the produced water 6 passing through the water outlet is directly discharged or recycled.
Wherein, the oil-water separation membrane device 3 is connected to the coagulating sedimentation tank 1 through a first pipeline, and oil phase intercepted by a membrane in the wastewater in the oil-water separation membrane device 3 flows back to the coagulating sedimentation tank 1 through the first pipeline for further treatment; an oil discharge valve 7 is installed on a first pipeline between the oil-water separation membrane device 3 and the coagulating sedimentation tank 1, the oil phase retained in the oil-water separation membrane device 3 is discharged through the oil discharge valve 7 when reaching an emulsified oil state, and water in the discharged liquid flows back to the coagulating sedimentation tank 1 through the first pipeline. The nanofiltration membrane device 5 is connected to the coagulation sedimentation tank 1 through a second pipeline, and concentrated water generated in the nanofiltration membrane device 5 flows back to the coagulation sedimentation tank 1 through the second pipeline for further circular treatment; the oil-water separation membrane selected by the oil-water separation membrane device 3 is a flat membrane or a hollow fiber membrane with a hydrophilic coating on the surface, and the membrane component is any one of a flat membrane component, a hollow fiber membrane component and a spiral membrane component. The deep oxidation device 4 is any one or more of an ozone oxidation device, a micro-nano bubble device and an ultraviolet oxidation treatment device.
The working principle of the utility model is as follows: conveying the fracturing return drainage to a coagulating sedimentation tank for coagulating sedimentation, then entering a solid-liquid separation device, separating suspended flocculate and precipitate in the solid-liquid separation device, entering an oil-water separation membrane device through a water solution subjected to solid-liquid separation, carrying out oil-water separation in the oil-water separation membrane device, filtering by the oil-water separation membrane device, entering a deep oxidation device through wastewater, entering a nanofiltration membrane device through oxidation, and directly discharging or recycling produced water in the nanofiltration membrane device. The system has the advantages of short flow, simple structure, easy control, high oil-water separation efficiency, high water quality of produced water, suitability for high oil content return drainage, capability of treating non-standard return drainage, standard discharge, environmental protection and secondary pollution prevention.
In the oil-water separation membrane device, oil in the wastewater is intercepted by a membrane, the intercepted concentrated solution, namely oil phase, returns to the coagulating sedimentation tank for further treatment, and when the concentration of the oil in the solution is higher (when the oil reaches an emulsified oil state), the oil is finally discharged through an oil discharge valve, and the water in the discharged solution can still flow back to the coagulating sedimentation tank. In the nanofiltration membrane device, the concentrated water treated by the nanofiltration membrane device flows back to the coagulating sedimentation tank for further circular treatment.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (7)
1. A fracturing flow-back water treatment system is characterized in that: comprises a coagulating sedimentation tank (1), a solid-liquid separation device (2), an oil-water separation membrane device (3), a deep oxidation device (4) and a nanofiltration membrane device (5), wherein the input end of the coagulating sedimentation tank (1) is connected with a fracturing return water delivery pipe through a pipeline, the output end of the coagulating sedimentation tank (1) is connected with the input end of the solid-liquid separation device (2), the output end of the solid-liquid separation device (2) is connected with the input end of the oil-water separation membrane device (3), the solid-liquid separation device (2) separates suspended flocculate and precipitate, the separated water solution enters the oil-water separation membrane device (3), the output end of the oil-water separation membrane device (3) is connected with the input end of the deep oxidation device (4), the output end of the deep oxidation device (4) is connected with the nanofiltration membrane device (5), and the water which permeates through the membrane after being filtered by the oil-water separation membrane device (3) enters the deep oxidation device (4), and oxidizing in a deep oxidation device (4), feeding into a nanofiltration membrane device (5) after oxidation, wherein a water outlet is arranged on the nanofiltration membrane device (5), and the produced water (6) passing through the water outlet is directly discharged or recycled.
2. The frac return drainage treatment system of claim 1, wherein: the oil-water separation membrane device (3) is connected to the coagulating sedimentation tank (1) through a pipeline I, and oil phase intercepted by a membrane in the wastewater in the oil-water separation membrane device (3) flows back to the coagulating sedimentation tank (1) through the pipeline I for further treatment.
3. The frac flowback water treatment system of claim 2, wherein: an oil discharge valve 7 is installed on a first pipeline between the oil-water separation membrane device (3) and the coagulating sedimentation tank (1), the oil phase intercepted in the oil-water separation membrane device (3) is discharged through the oil discharge valve (7) when reaching an emulsified oil state, and water in the discharged liquid flows back to the coagulating sedimentation tank (1) through the first pipeline.
4. The frac return drainage treatment system of claim 1, wherein: and the nanofiltration membrane device (5) is connected to the coagulative precipitation tank (1) through a second pipeline, and concentrated water generated in the nanofiltration membrane device (5) flows back to the coagulative precipitation tank (1) through the second pipeline for further circular treatment.
5. The frac flowback water treatment system of claim 4, wherein: the oil-water separation membrane selected by the oil-water separation membrane device (3) is a flat membrane or a hollow fiber membrane with a hydrophilic coating on the surface.
6. The frac flowback water treatment system of claim 4, wherein: the membrane component of the oil-water separation membrane device (3) is any one of a flat membrane component, a hollow fiber membrane component and a spiral membrane component.
7. The frac return drainage treatment system of claim 1, wherein: the deep oxidation device (4) is any one or more of an ozone oxidation device, a micro-nano bubble device and an ultraviolet oxidation treatment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121459479.7U CN215798863U (en) | 2021-06-29 | 2021-06-29 | Fracturing flow-back water treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121459479.7U CN215798863U (en) | 2021-06-29 | 2021-06-29 | Fracturing flow-back water treatment system |
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| Publication Number | Publication Date |
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| CN215798863U true CN215798863U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121459479.7U Active CN215798863U (en) | 2021-06-29 | 2021-06-29 | Fracturing flow-back water treatment system |
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2021
- 2021-06-29 CN CN202121459479.7U patent/CN215798863U/en active Active
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