CN118005213A - Advanced treatment device and method for fracturing flowback fluid - Google Patents
Advanced treatment device and method for fracturing flowback fluid Download PDFInfo
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- CN118005213A CN118005213A CN202410158615.0A CN202410158615A CN118005213A CN 118005213 A CN118005213 A CN 118005213A CN 202410158615 A CN202410158615 A CN 202410158615A CN 118005213 A CN118005213 A CN 118005213A
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- 239000012530 fluid Substances 0.000 title claims abstract description 70
- 238000011282 treatment Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 33
- 238000001728 nano-filtration Methods 0.000 claims abstract description 32
- 230000003647 oxidation Effects 0.000 claims abstract description 27
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000010865 sewage Substances 0.000 claims abstract description 19
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 230000001699 photocatalysis Effects 0.000 claims abstract description 3
- 238000007146 photocatalysis Methods 0.000 claims abstract description 3
- 238000005189 flocculation Methods 0.000 claims description 24
- 230000016615 flocculation Effects 0.000 claims description 24
- 238000000926 separation method Methods 0.000 claims description 21
- 238000010612 desalination reaction Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 239000003814 drug Substances 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 239000008394 flocculating agent Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 16
- 238000004064 recycling Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007667 floating Methods 0.000 abstract description 2
- 238000005374 membrane filtration Methods 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000012528 membrane Substances 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 239000000427 antigen Substances 0.000 description 3
- 102000036639 antigens Human genes 0.000 description 3
- 108091007433 antigens Proteins 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 238000006845 Michael addition reaction Methods 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229960003638 dopamine Drugs 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a fracturing flow-back fluid advanced treatment device and method. The treatment device comprises a flow-back liquid pool, a pretreatment system, an oil-water separator, a UV photocatalysis-hypochlorous acid advanced oxidation reactor, a nanofiltration salt removing system and a water producing pool which are sequentially communicated; the UV photocatalysis-hypochlorous acid advanced oxidation reactor comprises a reaction chamber, an ultraviolet generator used for generating ultraviolet photocatalysis on flowback fluid, and a hypochlorous acid generator used for generating hypochlorous acid oxidation on flowback fluid, wherein the ultraviolet generator is arranged in the reaction chamber, and an outlet of the hypochlorous acid generator is communicated with the reaction chamber. According to the invention, the oil-water separator is used for removing the floating oil in the sewage, then the UV photocatalysis-hypochlorous acid advanced oxidation reactor is used for efficiently removing the organic matters in the sewage, and finally the recyclable low-mineralization water is obtained through nanofiltration membrane filtration, so that the technical problems of poor treatment effect and high cost on the fracturing flowback fluid in the prior art are solved, the flowback fluid after deep treatment can be used for liquid preparation recycling, and the recycling performance is stable.
Description
Technical Field
The invention belongs to the technical field of fracturing flow-back fluid treatment, and particularly relates to a fracturing flow-back fluid advanced treatment device and method.
Background
The fracturing technology is one of important measures for improving the oil and gas recovery ratio, is an indispensable important technical means for exploration and development of oil and gas fields, and is widely adopted by various large oil fields. Because the fracturing fluid can damage the stratum after entering the stratum, most of the fracturing fluid can return to the ground as flowback fluid, but because the components of the flowback fluid are extremely complex, the fracturing fluid contains various pollutants, and if the fracturing fluid is directly discharged, the surrounding environment can be seriously polluted. Thus, there is an urgent need for treatment of frac flowback fluid.
The traditional technology for treating the fracturing flowback fluid at present comprises a physical treatment method, a chemical treatment method, a biological treatment method and the like, and the existing treatment technology has more or less defects such as large dosage of medicament, high treatment cost, poor treatment effect, difficult equipment maintenance and the like, and in addition, a complete set of advanced treatment device and method for the fracturing flowback fluid are not formed.
Disclosure of Invention
The invention aims to provide a fracturing flow-back fluid advanced treatment device and a fracturing flow-back fluid advanced treatment method, so as to solve the problems of poor fracturing flow-back fluid treatment effect and high cost in the prior art.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
On one hand, the invention provides a fracturing flow-back fluid advanced treatment device, which comprises a flow-back fluid pool, a pretreatment system, an oil-water separator, a UV photocatalysis-hypochlorous acid advanced oxidation reactor, a nanofiltration salt removal system and a water producing pool which are sequentially communicated; the UV photocatalysis-hypochlorous acid advanced oxidation reactor comprises a reaction chamber, an ultraviolet generator for generating ultraviolet photocatalysis on fracturing flowback fluid, and a hypochlorous acid generator for generating hypochlorous acid oxidation on fracturing flowback fluid, wherein the ultraviolet generator is arranged in the reaction chamber, and an outlet of the hypochlorous acid generator is communicated with the reaction chamber.
Preferably, a stirring paddle is arranged in the reaction chamber; the reaction chamber is equipped with a plurality of, and the inside of a plurality of reaction chambers all is equipped with ultraviolet generator and stirring rake, and a plurality of reaction chamber outsides all communicate with hypochlorous acid generator.
Preferably, a bag filter is also communicated between the pretreatment system and the oil-water separator; the water inlet of the bag filter is communicated with the pretreatment system, and the water outlet is communicated with the oil-water separator.
Preferably, the pretreatment system comprises a hydrocyclone and a flocculation system arranged in series, the hydrocyclone being in communication with the flowback fluid reservoir.
Preferably, the flocculation system comprises a medicament tank, a jet device, a pipeline mixer and a flocculation reactor which are sequentially communicated; the jet device is communicated with the hydrocyclone, and the flocculation reactor is communicated with the bag filter.
Preferably, the nanofiltration desalination system comprises a cartridge filter and nanofiltration equipment which are communicated in sequence, and the nanofiltration equipment is communicated with a water producing pool.
In another aspect, the invention also provides a method for advanced treatment of a fracturing flow-back fluid, comprising the following steps:
introducing the fracturing flowback fluid into a pretreatment system to remove mud and sand and perform flocculation sedimentation;
introducing the flocculated and settled sewage into an oil-water separator for oil-water separation treatment;
introducing the sewage after oil-water separation treatment into a UV photocatalysis-hypochlorous acid advanced oxidation reactor for photocatalysis-oxidation reaction;
and introducing the effluent after the photocatalytic-oxidation reaction into a nanofiltration desalination system for desalination treatment to obtain low-mineralization water.
Preferably, the flocculating agent added in flocculation sedimentation is polyacrylamide, and the polyacrylamide accounts for 0.05-1.0% of the total amount of the fracturing flowback fluid.
Preferably, the power of an ultraviolet light generator in the UV photocatalysis-hypochlorous acid advanced oxidation reactor is 50-100W, the wavelength of ultraviolet light is less than or equal to 254nm, and the hypochlorous acid concentration is 200-250 ppm.
Preferably, the operating pressure of the nanofiltration device in the nanofiltration desalination system is 0.4-0.5 MPa.
The beneficial effects of the invention are as follows:
The fracturing flow-back fluid deep treatment device provided by the invention can be used for carrying out deep treatment on the fracturing flow-back fluid, and meets the standard of the recycling requirement of the fracturing flow-back fluid. The organic matters and high-content salt matters in the deeply treated fracturing flowback fluid are greatly reduced, and the deep-treated fracturing flowback fluid can be used for preparing polymer dry powder liquid and has good temperature resistance and shearing resistance.
According to the invention, the flocculant is added into the fracturing flowback fluid to enable impurities and suspended particles to settle, so that solid-liquid separation is realized; the oil-water separation can realize the separation of oil and water in the oily wastewater; the UV light cooperates with the hypochlorous acid advanced oxidation to thoroughly decompose organic pollutants which are difficult to degrade under the mild conditions of normal temperature and normal pressure; the nanofiltration membrane can realize interception of bivalent or high-valence salt substances under low pressure, so that a method for pretreatment, oil-water separation, UV photocatalysis-hypochlorous acid advanced oxidation reaction, nanofiltration desalination and advanced treatment of fracturing flowback fluid is formed. The method has the characteristics of small dosage of the medicament, low operation cost, high treatment efficiency and no secondary pollution, and provides a new technical approach for the treatment of the fracturing flow-back fluid.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of a fracturing flow-back fluid advanced treatment apparatus of the present invention;
FIG. 2 is a graph showing the viscosity-temperature profile of a 1% polymer dry powder solution prepared from the flowback fluid treated in accordance with an embodiment of the present invention;
in the figure, 1, a flowback pool; 2. a pretreatment system; 21. a hydrocyclone; 22. a flocculation system; 221. a medicament pool; 222. a jet device; 223. a pipe mixer; 224. a flocculation reactor; 3. an oil-water separator; 31. a liquid storage tank; 4. a UV photocatalysis-hypochlorous acid advanced oxidation reactor; 41. a reaction chamber; 42. an ultraviolet light generator; 43. stirring paddles; 44. a hypochlorous acid generator; 45. a buffer tank; 5. a nanofiltration desalination system; 51. a cartridge filter; 52. a nanofiltration device; 6. a water producing pool; 7. bag filters.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
On the one hand, referring to fig. 1, the advanced treatment device for fracturing flowback fluid provided in this embodiment includes a flowback fluid pool 1, a pretreatment system 2, an oil-water separator 3, a UV photocatalytic-hypochlorous acid advanced oxidation reactor 4, a nanofiltration salt removal system 5 and a water producing pool 6 which are sequentially communicated.
Specifically, the pretreatment system 2 comprises a hydrocyclone 21 and a flocculation system 22 which are arranged in series, wherein the hydrocyclone 21 is communicated with the flowback liquid pool 1 through a pipeline, and the fracturing flowback liquid enters the hydrocyclone 21 for solid-liquid separation to remove the silt. Flocculation system 22 includes a reagent tank 221, a jet 222, a pipe mixer 223, and a flocculation reactor 224 in sequential communication. The inlet of the ejector 222 is communicated with the hydrocyclone 21 and the reagent tank 221, the sewage after solid-liquid separation of the hydrocyclone 21 enters the ejector 222, meanwhile, chemical reagent is added into the ejector 222 through the reagent tank 221, the sewage and the chemical reagent enter the flocculation reactor 224 through the pipeline mixer 223 for flocculation sedimentation, and suspended matters in the sewage are removed, and the flocculation reactor can be a micro-vortex flocculation reactor.
A bag filter 7 is also communicated between the pretreatment system 2 and the oil-water separator 3; the water inlet of the bag filter 7 is communicated with the outlet of the flocculation reactor 224, and the water outlet thereof is communicated with the oil-water separator 3. The sewage after flocculation reaction is filtered by a bag filter 7 and enters an oil-water separator 3 for oil-water separation. In this embodiment, the oil-water separation membrane in the oil-water separator is preferably an antigen oil-contaminated oil-water separation membrane, and the antigen oil-contaminated oil-water separation membrane is obtained by generating a michael addition reaction between dopamine and hydrophilic carbon dots with amino groups on the surface, and is co-deposited on the surface of the substrate membrane in one step, so that the antigen oil-contaminated oil-water separation membrane has the capability of effectively separating an oil/water mixture. The water outlet of the oil-water separator 3 is connected with a liquid storage tank 31 for storing the water phase obtained after oil-water separation. The water outlet of the liquid storage tank 31 is communicated with the UV photocatalysis-hypochlorous acid advanced oxidation reactor 4.
The UV photocatalysis-hypochlorous acid advanced oxidation reactor 4 comprises a reaction chamber 41, wherein an ultraviolet light generator 42 and a stirring paddle 43 are arranged in the reaction chamber 41, and a hypochlorous acid generator 44 is communicated with the outside. The reaction chambers of the invention can be provided with a plurality of reaction chambers, the inside of each reaction chamber is provided with an ultraviolet light generator and a stirring paddle, and the outside of each reaction chamber is communicated with a hypochlorous acid generator. The reaction chambers of the embodiment are provided with three, the reaction chambers are separated by the partition boards with different water levels, each reaction chamber is provided with an ultraviolet light generator 42 and a stirring paddle 43, the bottom of each reaction chamber is provided with a hypochlorous acid inlet, and the outlet of the hypochlorous acid generator 44 is communicated with the hypochlorous acid inlet of the reaction chamber. The water phase in the liquid storage tank 31 enters the UV photocatalysis-hypochlorous acid advanced oxidation reactor 4 and is subjected to primary treatment in the first water chamber, the water phase enters the second water chamber after being uniformly mixed by stirring slurry, and enters the third water chamber after the water level reaches the requirement, so that the residence time of the fracturing flowback fluid in the reaction chamber can be prolonged, and organic pollutants which are difficult to degrade are thoroughly decomposed under the cooperation of UV light and hypochlorous acid advanced oxidation.
The water outlet of the UV photocatalysis-hypochlorous acid advanced oxidation reactor 4 is communicated with a buffer tank 45, and the nanofiltration desalination system 5 comprises a cartridge filter 51 and a nanofiltration device 52 which are communicated in sequence. The water outlet of the buffer tank 45 is communicated with the cartridge filter 51, the water outlet of the cartridge filter 51 is communicated with the nanofiltration device 52, the high-mineralization water outlet of the nanofiltration device 52 is communicated with the buffer tank 45, and the low-mineralization water outlet is communicated with the water producing pool 6. The nanofiltration device 52 is composed of a plurality of nanofiltration tubes connected in parallel, which are designed to increase the throughput per unit time. Nanofiltration is a pressure driven membrane separation process with separation properties intermediate to reverse osmosis and ultrafiltration, allowing some monovalent salts and solvents to permeate the membrane, thus achieving separation. The fracturing flowback fluid is subjected to advanced oxidation by UV light and hypochlorous acid to remove organic pollutants, then enters a deep treatment module, is filtered by a cartridge filter 51 to ensure removal of all large particulate matters, and passes through a nanofiltration tube with the membrane aperture of nano-scale size, so that the content of bivalent salt or multivalent salt in the fracturing flowback fluid is reduced.
Accordingly, the method for deeply treating the fracturing flow-back fluid provided by the other aspect of the invention comprises the following steps:
Step one, conveying the fracturing flowback fluid to a hydrocyclone for solid-liquid separation to obtain silt and sewage, wherein the silt is discharged to a silt pot through a sand setting port, the sewage is conveyed to a jet device, meanwhile, a flocculating agent is added into the jet device through a medicament pond, the sewage and the flocculating agent are uniformly mixed through a pipeline mixer, and flocculating sedimentation is carried out in a micro-vortex flocculation reactor, and then filtering is carried out through a bag filter. In the step, the flocculant is polyacrylamide, and the polyacrylamide accounts for 0.05% of the total amount of the fracturing flowback fluid.
And step two, the oily sewage filtered by the bag filter is further conveyed to an oil-water separator for oil-water separation to obtain an oil phase and a water phase, wherein the oil phase is discharged from an oil outlet, and the water phase is conveyed to a liquid storage tank.
And thirdly, the water phase in the liquid storage tank is further conveyed to a UV photocatalysis-hypochlorous acid advanced oxidation reactor, stays in a first reaction chamber, enters a second reaction chamber after being uniformly mixed by a stirring paddle, enters a third reaction chamber after the water level reaches the requirement, is provided with an ultraviolet light generator, a stirring paddle and a hypochlorous acid inlet, sewage is fully treated, is discharged at a water outlet after the water level reaches the requirement, and enters a buffer tank. The power of the ultraviolet light generator in the UV photocatalysis-hypochlorous acid advanced oxidation reactor is 80W, the wavelength of the UV light is 254nm, and the hypochlorous acid concentration is 200ppm. The UV light cooperates with the hypochlorous acid advanced oxidation to thoroughly decompose the organic pollutants which are difficult to degrade under the mild conditions of normal temperature and normal pressure.
And fourthly, the effluent after the photocatalysis-oxidation reaction is further conveyed to a cartridge filter, the filtered sewage is conveyed to nanofiltration equipment for desalination treatment, high-mineralization water and low-mineralization water are obtained, the high-mineralization water flows back to a buffer tank, and the low-mineralization water is conveyed to a water producing pool. Wherein the operating pressure of the nanofiltration device is 0.4MPa.
The polymer solution with the concentration of 1% is prepared by mixing low-mineralization water after desalination treatment in the step four with polymer dry powder (cationic polyacrylamide formed by polymerization of acrylamide and methacryloxyethyl trimethyl ammonium chloride), and the viscosity-temperature curve of the solution is tested, and the result is shown in figure 2, and the flow-back fluid after deep treatment can completely dissolve the polymer dry powder, and the viscosity of the obtained solution is 72 mPa.s at 30 ℃, and the viscosity is reduced to 30 mPa.s after shearing for 2 hours at 90 ℃, so that organic matters and salt matters in the fracturing flow-back fluid after deep treatment are greatly reduced, and the flow-back fluid can be used for preparing the polymer dry powder fluid and has good temperature resistance and shearing resistance.
In summary, the advanced treatment device and the advanced treatment method provided by the invention firstly remove the muddy sand in the fracturing flowback fluid by using the pretreatment system, flocculate and settle suspended matters in the sewage by using the flocculant, remove the floating oil in the sewage by using the oil-water separator, then efficiently remove organic matters in the sewage by using the UV photocatalysis-hypochlorous acid advanced oxidation reactor, finally obtain the recyclable low-mineralization water by using the nanofiltration membrane, solve the technical problems of poor treatment effect and high cost on the fracturing flowback fluid in the prior art, and the flowback fluid after the advanced treatment can be used for preparing and recycling the liquid and has stable recycling performance.
It should be noted that, the foregoing embodiments all belong to the same inventive concept, and the descriptions of the embodiments have emphasis, and where the descriptions of the individual embodiments are not exhaustive, reference may be made to the descriptions of the other embodiments.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The fracturing flow-back fluid advanced treatment device is characterized by comprising a flow-back fluid pool, a pretreatment system, an oil-water separator, a UV photocatalysis-hypochlorous acid advanced oxidation reactor, a nanofiltration salt removal system and a water producing pool which are sequentially communicated; the UV photocatalysis-hypochlorous acid advanced oxidation reactor comprises a reaction chamber, an ultraviolet generator used for generating ultraviolet photocatalysis on the fracturing flowback fluid, and a hypochlorous acid generator used for generating hypochlorous acid oxidation on the fracturing flowback fluid, wherein the ultraviolet generator is arranged in the reaction chamber, and an outlet of the hypochlorous acid generator is communicated with the reaction chamber.
2. The fracturing flow-back fluid advanced treatment device of claim 1, wherein a stirring paddle is arranged inside the reaction chamber; the reaction chamber is provided with a plurality of reaction chambers, the inside of which is provided with an ultraviolet generator and a stirring paddle, and the outside of which is communicated with the outlet of the hypochlorous acid generator.
3. The fracturing flow-back fluid advanced treatment device of claim 1, wherein a bag filter is further communicated between the pretreatment system and the oil-water separator; the water inlet of the bag filter is communicated with the pretreatment system, and the water outlet of the bag filter is communicated with the oil-water separator.
4. The fracturing flow-back fluid advanced treatment apparatus of claim 1, wherein said pretreatment system comprises a hydrocyclone and flocculation system arranged in series, said hydrocyclone in communication with a flowback fluid reservoir.
5. The fracturing flow-back fluid advanced treatment apparatus of claim 4, wherein said flocculation system comprises a medicament tank, a jet device, a pipeline mixer and a flocculation reactor which are communicated in sequence; the jet device is communicated with the hydrocyclone, and the flocculation reactor is communicated with the bag filter.
6. The fracturing flow-back fluid advanced treatment device of claim 1, wherein said nanofiltration salt removal system comprises a cartridge filter and a nanofiltration device in sequential communication, said nanofiltration device in communication with a water producing reservoir.
7. A method for advanced treatment of frac flowback fluid using the apparatus of any one of claims 1 to 6, comprising the steps of:
introducing the fracturing flowback fluid into a pretreatment system to remove mud and sand and perform flocculation sedimentation;
introducing the flocculated and settled sewage into an oil-water separator for oil-water separation treatment;
introducing the sewage after oil-water separation treatment into a UV photocatalysis-hypochlorous acid advanced oxidation reactor for photocatalysis-oxidation reaction;
and introducing the effluent after the photocatalytic-oxidation reaction into a nanofiltration desalination system for desalination treatment to obtain low-mineralization water.
8. The method for advanced treatment of a fracturing flow-back fluid according to claim 7, wherein the flocculating agent added in the flocculation sedimentation is polyacrylamide, and the polyacrylamide accounts for 0.05% -1.0% of the total amount of the fracturing flow-back fluid.
9. The method for advanced treatment of a fracturing flow-back fluid according to claim 7, wherein the power of an ultraviolet light generator in the ultraviolet photocatalysis-hypochlorous acid advanced oxidation reactor is 50-100W, the wavelength of ultraviolet light is less than or equal to 254nm, and the hypochlorous acid concentration is 200-250 ppm.
10. The method for advanced treatment of a frac flowback fluid according to claim 7, wherein the nanofiltration device in the nanofiltration salt system operates at a pressure of 0.4 to 0.5MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410158615.0A CN118005213A (en) | 2024-02-02 | 2024-02-02 | Advanced treatment device and method for fracturing flowback fluid |
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| CN202410158615.0A CN118005213A (en) | 2024-02-02 | 2024-02-02 | Advanced treatment device and method for fracturing flowback fluid |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN215798863U (en) * | 2021-06-29 | 2022-02-11 | 上海统洁环保科技有限公司 | Fracturing flow-back water treatment system |
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