CN212127914U - Harmless treatment system for fracturing flowback fluid - Google Patents
Harmless treatment system for fracturing flowback fluid Download PDFInfo
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- CN212127914U CN212127914U CN202020657611.4U CN202020657611U CN212127914U CN 212127914 U CN212127914 U CN 212127914U CN 202020657611 U CN202020657611 U CN 202020657611U CN 212127914 U CN212127914 U CN 212127914U
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Abstract
The utility model discloses a fracturing flowback fluid innocent treatment system, which comprises a receiving well, a regulating and storing tank, a de-hardening and gel breaking reaction tank, a mechanical stirring and clarifying tank, a water phase regulating tank, a second-stage air flotation tank, an advanced oxidation tank, a hydrolysis acidification tank, a biological contact oxidation tank and a wastewater advanced treatment device which are sequentially connected through pipelines; it also comprises a collecting fan and a biological deodorization device. The utility model has the advantages that: after the odor generated in the purification treatment process of the fracturing flow-back fluid is treated by the system, the deodorization efficiency is 99 percent, and the odor is discharged into the atmosphere through a high exhaust funnel with the height of 20m after the treatment reaches the standard, so that the harmless treatment of the odor generated in the purification treatment process of the fracturing flow-back fluid is realized, the exhaust does not pollute the environment, and the system is safer and more environment-friendly; no wastewater is discharged, and no new water treatment equipment is needed to be added, so that the equipment investment cost is reduced; the reclaimed water generated after the fracturing flow-back fluid is purified is used for circulating water of deodorization reaction, so that additional consumption of underground water is not needed, and water resources are saved.
Description
The technical field is as follows:
the utility model relates to a flowing back processing system is returned in fracturing, especially relates to a flowing back innocent treatment system is returned in fracturing
Background art:
in the process of oil field development, a yield and injection increasing mode widely applied to oil-water well measures inevitably generates a large amount of measure flowback fluid, namely fracturing flowback fluid, along with the measure process, and has the characteristics of complex components, variable physicochemical properties, large treatment and transportation difficulty and the like. Meanwhile, with the implementation of the new two methods, how to efficiently and reasonably treat the measure waste liquid becomes one of bottleneck problems troubling the development of the oil field, so that the development of the measure waste liquid treatment technology has great significance for the development of the oil field.
At present, the ideal treatment mode of the fracturing flow-back fluid is as follows: the fracturing flow-back fluid is conveyed to a regulation pool (also used as an emergency pool) from a receiving well for storage, the regulation pool is provided with underwater stirring equipment, and the process is a physical process without adding chemicals. Conveying the fracturing flow-back fluid in the storage tank to a pH adjusting tank through a pump, and adding hydrochloric acid and caustic soda to adjust the pH value of the water body; the fracturing flow-back fluid adjusted by acid and alkali enters a de-hardening gel breaking reaction tank, and a de-hardening agent and a gel breaker are added for de-hardening gel breaking treatment; the treated water body enters a mechanical stirring clarification tank, a composite flocculant and a compound flocculant are added, and fine suspended matters in the fracturing flow-back fluid are further removed; the liquid phase enters a water phase regulating tank to be uniformly mixed with other water bodies. The water phase of the wastewater still contains a large amount of organic solvent which is difficult to be biochemically degradedA substance. Before biochemical treatment, a secondary air flotation tank (cavitation air flotation and dissolved air flotation) is used for adding a composite flocculant and a compound flocculant to further remove organic colloidal substances and most fine suspended matters in the water body, and high-level oxidation-micro-electrolysis is carried out after the air flotation is discharged. Through the iron-carbon filler and the added oxidant (H) in the advanced oxidation pond under the acidic condition2O2) The combined action of the two components enables the organic matters which are difficult to degrade in the water to be decomposed, the biodegradability of the water body is improved, and the high-grade oxidized effluent enters a biological treatment working section. The biological treatment section realizes the biological degradation of the sewage through a hydrolysis acidification-contact oxidation process, and the hydrolysis acidification tank is an anaerobic treatment process and is divided into two stages of hydrolysis and acidification. The biological contact oxidation method has the characteristics of both an active rock debris method and a biofilm method, is an aerobic biofilm method process, and mainly comprises a biological contact oxidation tank. The effluent of the biological treatment section is subjected to advanced treatment, the advanced treatment section adopts an ozone oxidation method and a biological carbon filter tank process to further degrade organic matters in the water body, then the clean water body enters a membrane treatment component, the recovery rate of the reclaimed water is improved as much as possible through a two-stage membrane treatment process of a low-pressure anti-pollution membrane and a seawater desalination membrane, the final effluent meets the primary standard of Integrated wastewater discharge Standard (GB8978-1996), the urban Water quality for Recycling of urban miscellaneous Water (GB/T18920 and 2002) the urban greening water Standard and the secondary standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918-2002), part of the final effluent is used for production water in a plant area, and the rest of the final effluent is used for drilling water and water for peripheral coal washery and is not discharged outside.
However, in the process of treating the fracturing flow-back fluid by adopting the method, the sections such as a regulation and storage, a hard removal and gel breaking, a mechanical clarification stirring tank and the like are received, and the subsequent sections such as a water phase regulating tank, a secondary air flotation, a high-grade oxidation, a hydrolytic acidification, a biological contact oxidation and the like all generate a large amount of malodorous gas, wherein the malodorous gas mainly comprises gases such as hydrogen sulfide, ammonia, methyl mercaptan, hydrocarbon compounds and the like, and is complex. The malodorous gas not only has serious influence on the ecological environment, but also has great harm to the health of human bodies, and can cause central nerves to generate obstacles and pathological changes to cause chronic diseases and acute diseases. Therefore, it is necessary to collect and detoxify the malodorous gases generated during the treatment.
The utility model has the following contents:
an object of the utility model is to provide a low-cost, safe environmental protection's fracturing flow-back fluid innocent treatment system.
The utility model discloses by following technical scheme implement: the fracturing flow-back fluid innocent treatment system comprises a receiving well, a regulating and storing tank, a de-hardening and gel-breaking reaction tank, a mechanical stirring and clarifying tank, a water phase regulating tank, a secondary air flotation tank, an advanced oxidation tank, a hydrolysis acidification tank, a biological contact oxidation tank and a wastewater advanced treatment device which are sequentially connected through pipelines; the device also comprises a collecting fan and a biological deodorization device, wherein the regulating storage tank, the hard removing and gel breaking reaction tank, the mechanical stirring and clarifying tank, the water phase regulating tank, the secondary air flotation tank, the advanced oxidation tank, the hydrolysis acidification tank and the biological contact oxidation tank are covered and sealed, and an air inlet of the collecting fan is respectively communicated with the regulating storage tank, the hard removing and gel breaking reaction tank, the mechanical stirring and clarifying tank, the water phase regulating tank, the secondary air flotation tank, the advanced oxidation tank, the hydrolysis acidification tank and the biological contact oxidation tank through air pipes; the air outlet of the collecting fan is communicated with the air inlet of the biological deodorization device; and an air outlet of the biological deodorization device is connected with an inlet of an exhaust funnel.
Further, the biological deodorization device comprises a pre-scrubber, a biological filter, a demister and an induced draft fan which are sequentially connected through an air pipe, wherein an air outlet of the collection fan is connected with an air inlet of the pre-scrubber, and an air outlet of the induced draft fan is connected with an inlet of the exhaust funnel; the water inlet of the pre-scrubber is connected with the water outlet of the pre-scrubber circulating water tank, and the water outlet of the pre-scrubber is connected with the water return port of the pre-scrubber circulating water tank; the water inlet of the biological filter is connected with the water outlet of the biological filter circulating water tank, and the water outlet of the biological filter is connected with the water return port of the biological filter circulating water tank; the water outlet of the pre-scrubber circulating water tank and the water outlet of the biological filter circulating water tank are both connected with the water inlet of the water phase regulating tank; and the water replenishing port of the pre-scrubber circulating water tank and the water replenishing port of the biological filter circulating water tank are both connected with the reclaimed water outlet of the wastewater advanced treatment device.
Further, the biological deodorization device also comprises a security adsorber, the air outlet of the collecting fan is connected with the air inlet of the security adsorber, and the air outlet of the security adsorber is connected with the air inlet of the draught fan.
Or the biological deodorization device comprises a washing tower, a UV photocatalytic oxidation device and an induced draft fan which are sequentially connected through an air pipe, wherein an air outlet of the collection fan is connected with an air inlet of the washing tower, and an air outlet of the induced draft fan is connected with an inlet of the exhaust funnel; the circulating water outlet of the washing tower is connected with the water inlet of the water phase regulating tank; and a circulating water replenishing port of the washing tower is connected with a reclaimed water outlet of the wastewater advanced treatment device.
The utility model has the advantages that: 1. after the odor generated in the purification treatment process of the fracturing flow-back fluid is treated by the system, the deodorization efficiency is 99 percent, and the odor is discharged into the atmosphere through a high exhaust funnel with the height of 20m after the treatment reaches the standard, so that the harmless treatment of the odor generated in the purification treatment process of the fracturing flow-back fluid is realized, the exhaust does not pollute the environment, and the system is safer and more environment-friendly; 2. circulating water participating in the deodorization reaction returns to the fracturing flow-back fluid purification treatment system for purification treatment, no wastewater is discharged, and meanwhile, new water treatment equipment is not required to be added, so that the equipment investment cost is reduced; 3. the utility model discloses return the normal water that the flowing back produced after purification treatment with the fracturing and be used for deodorizing reaction's circulating water, need not additionally to consume groundwater, save the water resource.
Description of the drawings:
FIG. 1 is a schematic view of a fracturing flow-back fluid innocent treatment system of example 1;
fig. 2 is a schematic view of a fracturing flow-back fluid harmless treatment system in example 2.
The device comprises a receiving well 1, a storage adjusting tank 2, a hard removing and gel breaking reaction tank 3, a mechanical stirring clarification tank 4, a water phase adjusting tank 5, a secondary air flotation tank 6, an advanced oxidation tank 7, a hydrolysis acidification tank 8, a biological contact oxidation tank 9, a wastewater deep treatment device 10, a collection fan 11, a biological deodorization device 12, a pre-scrubber 12-1, a biological filter 12-2, a demister 12-3, an induced draft fan 12-4, a pre-scrubber circulating water tank 12-5, a biological filter circulating water tank 12-6, a safety absorber 12-7, a washing tower 12-8 and UV photocatalytic oxidation equipment 12-9.
The specific implementation mode is as follows:
as shown in fig. 1, the fracturing flow-back fluid innocent treatment system comprises a receiving well 1, a regulating and storing tank 2, a de-hardening and gel breaking reaction tank 3, a mechanical stirring and clarifying tank 4, a water phase adjusting tank 5, a secondary air flotation tank 6, a high-grade oxidation tank 7, a hydrolysis and acidification tank 8, a biological contact oxidation tank 9 and a wastewater advanced treatment device 10 which are sequentially connected through pipelines; the biological deodorization device 12 comprises a pre-scrubber 12-1, a biological filter 12-2, a demister 12-3 and an induced draft fan 12-4 which are sequentially connected through an air pipe.
The regulation and storage tank 2, the de-hardening gel breaking reaction tank 3, the mechanical stirring and clarification tank 4, the water phase regulating tank 5, the secondary air flotation tank 6, the advanced oxidation tank 7, the hydrolysis and acidification tank 8 and the biological contact oxidation tank 9 are all covered and sealed, and the air inlet of the collecting fan 11 is respectively communicated with the regulation and storage tank 2, the de-hardening gel breaking reaction tank 3, the mechanical stirring and clarification tank 4, the water phase regulating tank 5, the secondary air flotation tank 6, the advanced oxidation tank 7, the hydrolysis and acidification tank 8 and the biological contact oxidation tank 9 through air pipes; an air outlet of the collecting fan 11 is connected with an air inlet of the pre-scrubber 12-1, and an air outlet of the induced draft fan 12-4 is connected with an inlet of the exhaust funnel 13; the water inlet of the pre-scrubber 12-1 is connected with the water outlet of the pre-scrubber circulating water tank 12-5, and the water outlet of the pre-scrubber 12-1 is connected with the water return port of the pre-scrubber circulating water tank 12-5; through the spraying of circulating water in the pre-scrubber, under the action of filler barrier, impurities such as dust and particulate matters carried by waste gas entering the pre-scrubber are cleaned, and precipitated impurity sludge is removed at regular time, so that subsequent removal indexes are ensured; a water inlet of the biological filter 12-2 is connected with a water outlet of the biological filter circulating water tank 12-6, and a water outlet of the biological filter 12-2 is connected with a water return port of the biological filter circulating water tank 12-6; when the waste gas is filtered by the biological activated carbon, fine suspended substances, odor and other harmful substances in the waste gas are filtered. Along with the saturation of adsorption, the biological activated carbon needs to be subjected to active regeneration through circulating water flushing, so that the service cycle is prolonged; the water outlet of the pre-scrubber circulating water tank 12-5 and the water outlet of the biological filter circulating water tank 12-6 are both connected with the water inlet of the water phase regulating tank 5; the water replenishing port of the pre-scrubber circulating water tank 12-5 and the water replenishing port of the biological filter circulating water tank 12-6 are both connected with the reclaimed water outlet of the wastewater advanced treatment device 10. The biological deodorization device 12 also comprises a security absorber 12-7, the air outlet of the collection fan 11 is connected with the air inlet of the security absorber 12-7, and the air outlet of the security absorber 12-7 is connected with the air inlet of the induced draft fan 12-4. When the biological filter 12-2 is in failure, the cartridge absorber 12-7 is operated to purify the collected odor.
The prewasher 12-1 of the embodiment is a prewasher manufactured by Zhenjiang Weisi source mechanical equipment, Inc., and has a model ZXDQ-56000, and the main technical parameters are shown in the following table:
the security adsorber 12-7 of the embodiment is a security adsorption filter manufactured by Yihai environmental protection technology Limited in all cities, the equipment model is ZYXF-60000, and the main technical parameters are shown in the following table:
| product name | Safety adsorption filter |
| Product type | ZYXF-60000 |
| Overall dimension | 2000*1820*1320mm |
| Adsorption material | 5-channel filtering and adsorbing belt fiber filter cotton |
| Consumable article | Fiber filter cotton |
| Equipment materials | Main body material PP + SS304 |
In the embodiment, the collected odor is contacted with a biofilm (microorganism) attached to and growing on the filler through a wet porous biological filter filled with the filler, is adsorbed or degraded by the microorganism, and is finally converted into simple inorganic substances (such as CO)2、H2O、SO4 2-、NO3-And Cl-Etc.) to achieve the effect of degrading pollutants, the deodorization efficiency is 99 percent, and the pollutants are discharged into the atmosphere through a 20m high exhaust funnel after the pollutants are treated to reach the standard. The biofilter of this example was manufactured by Ohio Yihai environmental protection science and technology, Inc., with equipment model ZYHG-66000, and the main technical parameters are as shown in the following table:
| product name | Biological activated carbon filter |
| Product type | ZYHG-66000 |
| Product specification | 3400*1900*2300mm |
| Parameter(s) | The thickness of the 3 layers of drawer active carbon is 60-80mm |
| Consumable article | Activated carbon |
| Equipment materials | U-PVC+SS304 |
Example 2: as shown in fig. 2, the fracturing flow-back fluid innocent treatment system is different from the fracturing flow-back fluid innocent treatment system in example 1: the biological deodorization device 12 comprises a washing tower 12-8, a UV photocatalytic oxidation device 12-9 and an induced draft fan 12-4 which are sequentially connected through an air pipe, an air outlet of the collection fan 11 is connected with an air inlet of the washing tower 12-8, and an air outlet of the induced draft fan 12-4 is connected with an inlet of an exhaust funnel 13; a circulating water outlet of the washing tower 12-8 is connected with a water inlet of the water phase regulating tank 5; the circulating water replenishing port of the washing tower 12-8 is connected with the reclaimed water discharging port of the wastewater advanced treatment device 10. Through the circulating water spraying inside the scrubbing tower, under the effect of the internal inclined plate blocking flow resistance, impurities such as dust and particulate matters carried by the waste gas entering the scrubbing tower are deeply washed, so that the fine particulate matters such as dust and foreign matters are dissolved in water, quickly settled and discharged, and the subsequent removal effect is ensured.
The washing tower 12-8 of the embodiment is a two-phase countercurrent flow packing washing tower, gas enters the washing tower 12-8 from a gas inlet below the tower body along the tangential direction, quickly fills the space of a gas inlet section under the action of power of a draught fan 12-4, and then uniformly rises to a first-stage packing absorption section through a flow section. On the surface of the packing, the contaminants in the gas phase chemically react with the substances in the liquid phase. The gas which is not absorbed by reaction continuously rises to enter the first stage spraying section, and circulating water in the spraying section is sprayed out from the uniform nozzle at high speed to form countless fine fog drops which are fully mixed and contacted with the gas to continuously generate chemical reaction. The gas then rises to the second stage packing section and the spray section for an absorption process similar to the first stage. The second stage and the first stage have different nozzle densities, different liquid spraying pressures and different absorbing gas concentration ranges. The uppermost part of the tower body is a demisting section, absorption liquid fog drops carried in the gas are removed, and the treated clean air is discharged into next-stage treatment equipment from the upper end of the purification tower.
In the UV photocatalytic oxidation equipment 12-9, ozone and hydroxyl radicals generated by the reaction of high-energy ultraviolet light beams with air and titanium dioxide carry out a synergistic decomposition oxidation reaction on malodorous gas, and meanwhile, macromolecular malodorous gas breaks a chain structure under the action of ultraviolet rays, so that malodorous gas substances are converted into odorless micromolecular compounds or completely mineralized to generate water and carbon dioxide, and the water and the carbon dioxide are discharged into the atmosphere through an exhaust funnel after reaching the standard. The UV photocatalytic oxidation equipment 12-9 of the embodiment adopts the model of UV-3600, and the main technical parameters are shown in the following table:
| serial number | Name (R) | Unit of | |
| 1 | Single unit for treating air quantity | m3/h | 36000 |
| 2 | Installed power | kw | 15 |
| 3 | Resistance of the apparatus | Pa | ≤300 |
| 4 | Overall dimension | mm | L3200*W1200* |
| 5 | Equipment materials | The main material is as follows: stainless steel |
The washing tower of the embodiment is selected to be PLT-3600, and the main technical parameters are shown in the following table:
| serial number | Name (R) | Unit of | |
| 1 | Processing air volume | m3/h | 36000 |
| 2 | Empty tower speedDegree of rotation | m/s | 1.75 |
| 3 | Resistance of the apparatus | Pa | ≤600 |
| 4 | Overall dimension | mm | Φ2700*5500 |
| 5 | Equipment materials | Main material PP, t10-12mm |
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The fracturing flow-back fluid innocent treatment system comprises a receiving well, a regulating and storing tank, a de-hardening and gel-breaking reaction tank, a mechanical stirring and clarifying tank, a water phase regulating tank, a secondary air flotation tank, an advanced oxidation tank, a hydrolysis acidification tank, a biological contact oxidation tank and a wastewater advanced treatment device which are sequentially connected through pipelines; the method is characterized in that: the device also comprises a collecting fan and a biological deodorization device, wherein the regulating storage tank, the hard removing and gel breaking reaction tank, the mechanical stirring and clarifying tank, the water phase regulating tank, the secondary air flotation tank, the advanced oxidation tank, the hydrolysis acidification tank and the biological contact oxidation tank are covered and sealed, and an air inlet of the collecting fan is respectively communicated with the regulating storage tank, the hard removing and gel breaking reaction tank, the mechanical stirring and clarifying tank, the water phase regulating tank, the secondary air flotation tank, the advanced oxidation tank, the hydrolysis acidification tank and the biological contact oxidation tank through air pipes; the air outlet of the collecting fan is communicated with the air inlet of the biological deodorization device; and an air outlet of the biological deodorization device is connected with an inlet of an exhaust funnel.
2. The fracturing flow-back fluid harmless treatment system according to claim 1, wherein the biological deodorization device comprises a pre-scrubber, a biological filter, a demister and an induced draft fan which are sequentially connected through an air pipe, an air outlet of the collection fan is connected with an air inlet of the pre-scrubber, and an air outlet of the induced draft fan is connected with an inlet of the exhaust funnel; the water inlet of the pre-scrubber is connected with the water outlet of the pre-scrubber circulating water tank, and the water outlet of the pre-scrubber is connected with the water return port of the pre-scrubber circulating water tank; the water inlet of the biological filter is connected with the water outlet of the biological filter circulating water tank, and the water outlet of the biological filter is connected with the water return port of the biological filter circulating water tank; the water outlet of the pre-scrubber circulating water tank and the water outlet of the biological filter circulating water tank are both connected with the water inlet of the water phase regulating tank; and the water replenishing port of the pre-scrubber circulating water tank and the water replenishing port of the biological filter circulating water tank are both connected with the reclaimed water outlet of the wastewater advanced treatment device.
3. The harmless treatment system of the fracturing flow-back fluid according to claim 2, wherein the biological deodorization device further comprises a security adsorber, an air outlet of the collection fan is connected with an air inlet of the security adsorber, and an air outlet of the security adsorber is connected with an air inlet of the induced draft fan.
4. The harmless treatment system for the fracturing returned liquid according to claim 1, wherein the biological deodorization device comprises a washing tower, a UV photocatalytic oxidation device and an induced draft fan which are sequentially connected through an air pipe, an air outlet of the collection fan is connected with an air inlet of the washing tower, and an air outlet of the induced draft fan is connected with an inlet of the exhaust funnel; the circulating water outlet of the washing tower is connected with the water inlet of the water phase regulating tank; and a circulating water replenishing port of the washing tower is connected with a reclaimed water outlet of the wastewater advanced treatment device.
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| CN202020657611.4U CN212127914U (en) | 2020-04-26 | 2020-04-26 | Harmless treatment system for fracturing flowback fluid |
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| CN202020657611.4U CN212127914U (en) | 2020-04-26 | 2020-04-26 | Harmless treatment system for fracturing flowback fluid |
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