CN111547896A - Process and treatment system for treating wastewater generated in oil field operation - Google Patents
Process and treatment system for treating wastewater generated in oil field operation Download PDFInfo
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- 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
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- C01D3/04—Chlorides
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- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- 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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- 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
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
Abstract
The invention relates to a process for treating wastewater from oil field operation, which comprises the following steps: adjusting and caching, three-phase vortex air flotation treatment, oxidation gel breaking treatment, coagulating sedimentation treatment, ultrafiltration treatment, nanofiltration treatment and reverse osmosis treatment. A processing system is also disclosed. The invention achieves the following beneficial effects: the treatment time is shortened, the efficiency is improved, the treatment cost is reduced, the treatment effect is good, and the wastewater is recycled.
Description
Technical Field
The invention relates to the technical field of oil field wastewater treatment, in particular to a process and a treatment system for treating oil field operation wastewater.
Background
At present, the main treatment directions of domestic fracturing flowback fluid include reinjection, reuse, discharge after centralized treatment and the like, and the technology has more application categories, such as natural evaporation, freeze thawing, mechanical filtration, ozone oxidation, chemical flocculation, electric flocculation, reverse osmosis, evaporation and distillation and the like.
Most of domestic oil fields adopt the traditional treatment process of natural sedimentation-coagulation-filtration. However, the traditional treatment process has many problems, such as long settling time, low treatment capacity, excessive addition of purification agents, increased salt content in the treated liquid, excessive sludge amount after flocculation and precipitation, and increased transportation cost.
A centralized treatment mode is adopted in part of oil and gas fields, and although the mode can better solve the environmental protection problem, the fracturing oil is short in flowback period and long in wastewater transportation time, so that the wastewater transportation cost is high and the treatment cost is high.
The domestic oil field operation wastewater treatment process is still in an exploration stage and mainly adopts the following modes:
in the first mode, a combined process with a biological treatment technology as a core is adopted. The combination form comprises a 6-step combination process of 'coagulation-extraction-microelectrolysis-adsorption-catalytic oxidation-biodegradation', a 5-step combination process of 'coagulation-internal electrolysis-advanced oxidation-adsorption-biodegradation', a 4-step combination process of 'coagulation-microelectrolysis-activated carbon adsorption-biodegradation', and a 5-step combination process of 'advanced oxidation-coagulation-hydrolytic acidification-biodegradation-adsorption'. The combined process taking biological treatment as a core firstly improves the biochemical property of the fracturing flow-back fluid through the pretreatment steps of flocculation, adsorption, advanced oxidation or micro-electrolysis and the like, and then greatly removes organic pollutants through a biochemical method; the method has the defects of long treatment period, large equipment floor area, incapability of skid mounting, relatively complex process for searching dominant strains, and incapability of realizing treatment along with flowback due to the fact that fracturing flowback fluid needs to be treated in a unified way after being concentrated.
And the second mode is a combined process taking the advanced oxidation technology as a core. The combination form comprises a gel breaking flocculation-filtration-O3/H2O 2 composite catalytic oxidation-deep oxidation 4-step combination process, a flocculation-oil removal-sodium hypochlorite combined ultraviolet light oxidation 3-step combination process, a first-stage tempering-compound oxidation-second-stage tempering-multi-stage flocculation-separation 5-step combination process. The combination process taking the advanced oxidation technology as a core generally at least comprises 2-3 advanced oxidation technologies, and mainly relates to an advanced oxidation reagent such as a Fenton reagent, ozone, potassium permanganate, sodium hypochlorite and the like. In summary, the advanced oxidation technology for treating the fracturing flow-back fluid has no selectivity, short treatment time and small equipment floor area, is easy to skid-mount, and is a highly effective COD removal technology, but for the fracturing flow-back fluid with poor water quality, the combination of 2-3 advanced oxidation reagents can greatly reduce the COD of the fracturing flow-back fluid, but still cannot meet the requirements of national emission standards.
And the third mode is a combined process taking the membrane technology as a core. The combination form comprises a flocculation-microwave strong oxidation-activated carbon felt treatment-nanofiltration/reverse osmosis 4-step combination process and an ultrafiltration membrane and reverse osmosis membrane double-membrane combination process. The membrane treatment technology can realize the advanced treatment of the fracturing flow-back fluid, the water quality after the treatment is good and stable, and the advanced treatment can basically reach the first-level discharge standard in the national comprehensive sewage discharge standard. However, the membrane technology suffers from the problem of membrane contamination during the application process. The membrane pollution is a bottleneck problem which restricts the further popularization and application of the membrane technology at present. The membrane pollution phenomenon causes the reduction of membrane processing capacity, the subsequent cleaning is frequent, and when the membrane module is serious, the membrane module needs to be replaced, so the processing cost is generally high.
In the above-mentioned several main treatment processes, the advantages and disadvantages are all obvious. The company improves on the basis of the method, and overcomes the defects while keeping the advantages of the method.
Specifically, aiming at the problems that most of oil gas exploitation in China is distributed in desert regions and water resources are in short supply, a process and a treatment system for treating wastewater generated in oil field operation are developed, pollutants in the wastewater are treated and recovered according to quality, high-quality recovery of water resources is realized, the process and the treatment system have the characteristics of low energy consumption, low investment, stable operation and capability of realizing various treatment requirements by parameterization and customization, have higher technical application and popularization values, and can effectively solve the problems that fracturing flowback liquid of produced water is difficult to treat, the treatment cost is high, the treatment investment is large, the produced water cannot be stably discharged or recycled up to the standard and the like in the oil gas exploitation process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a process and a treatment system for treating the wastewater generated in the oilfield operation, which have the advantages of shortening the treatment time, improving the efficiency, reducing the treatment cost and having good treatment effect.
The purpose of the invention is realized by the following technical scheme: a process for treating wastewater from oil field operation comprises the following steps:
s1, primary treatment, namely, firstly, buffering the oil field wastewater in a regulating sedimentation tank to buffer and regulate the water quality, and naturally settling sand;
s2, deoiling;
s21, introducing the water treated in the step S1 into a three-phase vortex air flotation tank, and adding a flocculating agent to fully flocculate impurities in the water;
s22, introducing air into the water, separating out the air from the water in the form of micro bubbles, floating suspended matters, floating oil and missible oil in the water to the water surface along with the micro bubbles, and removing dirt floating to the water surface;
s3, carrying out oxidation gel breaking treatment, namely adding a gel breaking oxidant into the deoiled water, wherein the gel breaking oxidant is mainly prepared from potassium ferrate, sodium hypochlorite and hydrogen peroxide, and oxidizing macromolecular organic matters in the water into micromolecular organic matters by utilizing the strong oxidizing performance of the gel breaking oxidant so as to prevent the pollution and the blockage of a subsequent membrane device;
s4, performing coagulation treatment, namely adding sodium carbonate and a coagulant into the water subjected to the oxidation gel breaking treatment to reduce the hardness and heavy metal ions of the water and adjust the hardness of the water;
s5, performing ultrafiltration treatment, namely introducing water into an ultrafiltration device to further remove suspended matters and macromolecular organic matters in the water, wherein SS =0mg/L, COD of the treated water is not more than 200 mg/L;
s6, nanofiltration treatment, namely introducing water into a nanofiltration device, and separating concentrated sulfate to form water containing chloride;
s7, introducing the concentrated saline chloride into a reverse osmosis device, wherein the concentration of the treated sodium chloride in the water is 8-10%, and the water quality of the urban greening miscellaneous water and the agricultural irrigation water is met; and after reverse osmosis, the water with high chloride concentration is evaporated and crystallized to produce industrial-grade chloride.
Further, in step S6, water with a higher concentration is generated after the nanofiltration treatment, and the water is electrolyzed into sulfuric acid and alkali by the bipolar membrane electrodialysis device, and then recovered for blending the fracturing oil.
Furthermore, in step S7, after reverse osmosis by the reverse osmosis device, water with high sodium chloride concentration is also generated, and industrial-grade sodium chloride is produced through evaporative crystallization.
Furthermore, in the step S2, SS in the deoiled water is less than or equal to 5mg/L, COD and less than or equal to 1000mg/L, and oil content is less than or equal to 3 mg/L.
The chloride salt is sodium chloride.
A treatment system for treating wastewater generated in oilfield operation comprises an adjusting cache tank, a three-phase vortex air flotation tank, an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially connected.
Further, the ultrafiltration device is also connected with the bipolar membrane electrodialysis device.
The invention has the following advantages:
(1) in the scheme, in the whole treatment process, the deoiling treatment, the oxidation gel breaking treatment, the coagulating sedimentation treatment and the subsequent treatment are all in an active treatment mode, compared with the traditional long-time sedimentation, the treatment time is greatly shortened, the treatment efficiency is high, and because the three-phase eddy air flotation treatment is carried out firstly, a large amount of oil and particles are taken out, and only some macromolecular organic matters are left, the treatment is very easy, and compared with the sedimentation, the effect of fully treating and purifying is better;
(2) meanwhile, the modes of three-phase eddy air flotation, oxidation gel breaking and coagulating sedimentation treatment are adopted, and most of the modes are physical treatment modes;
(3) the oilfield operation wastewater is treated by the treatment process, so that the resource recycling of water, industrial salt, acid and alkali, sand and the like can be realized, and the near zero discharge of the wastewater is achieved; meanwhile, compared with the similar treatment process, the method has the advantages that the occupied area is small, skid-mounted treatment can be realized, and the occupied area is only 30% of that of the traditional process; the treatment effect is good, and the waste water can be subjected to greening recycling and value substance recovery; strong stability, and completely eliminates the defects of poor stability, difficult standard discharge and the like of other treatment processes.
Drawings
FIG. 1 is a schematic flow diagram of the treatment process of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1, a process for the treatment of oilfield operations wastewater, the process generally comprises the steps of: adjusting and caching, three-phase vortex air flotation treatment, oxidation gel breaking treatment, coagulating sedimentation treatment, ultrafiltration treatment, nanofiltration treatment and reverse osmosis treatment.
On the basis of the process, the treatment system comprises an adjusting cache tank, a three-phase vortex air flotation tank, an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially connected.
In the scheme, the method specifically comprises the following steps:
s1, primary treatment, namely, firstly, buffering the oil field wastewater in a regulating sedimentation tank to buffer and regulate the water quality, and naturally settling sand, wherein the naturally settled sand is collected and transported out as sludge;
s2, deoiling, wherein the deoiling mainly comprises the steps of treating one part of suspended particles and the other part of floating oil and missible oil;
for suspended particles, pumping the water treated in the step S1 into a three-phase vortex flotation tank through a pump, adding a flocculating agent, keeping the water temperature at normal temperature, allowing flocculate to grow, fully flocculating impurities in the water, and allowing the flocculate to wrap the suspended particles;
for floating oil and missible oil, air is introduced into water, the air is separated out from the water in the form of micro bubbles, flocs, floating oil and missible oil which wrap suspended particles in the water float to the water surface along with the micro bubbles, and then dirt floating to the water surface is removed; the water after deoiling treatment reaches SS less than or equal to 5mg/L, COD less than or equal to 1000mg/L and oil content less than or equal to 3 mg/L;
s3, after three-phase eddy air flotation treatment, large particles visible to the naked eye are removed in large quantity, but some macromolecular organic matters are inevitable to remain, in order to further treat, the scheme adopts oxidation gel breaking treatment, a gel breaking oxidant is added into water after oil removal treatment, the gel breaking oxidant is mainly prepared by potassium ferrate, sodium hypochlorite and hydrogen peroxide, and the macromolecular organic matters in the water are oxidized into micromolecular organic matters by utilizing the strong oxidation performance of the gel breaking oxidant, namely, on one hand, degradation treatment is carried out, and on the other hand, the pollution and blockage of a subsequent membrane device are prevented;
s4, performing coagulation treatment, namely adding sodium carbonate and a coagulant into the water subjected to the oxidation gel breaking treatment to reduce the hardness of the water and heavy metal ions, adjusting the hardness of the water, and performing the oxidation gel breaking and coagulation treatment to ensure that the removal rate of organic matters in the wastewater reaches more than 85%;
s5, performing ultrafiltration treatment, namely introducing water into an ultrafiltration device to further remove suspended matters and macromolecular organic matters in the water, wherein SS =0mg/L, COD of the treated water is not more than 200 mg/L;
s6, nanofiltration treatment, namely introducing the water into a nanofiltration device, separating concentrated sulfate to form water containing chloride salt, wherein the water concentration of the sulfate is 18-20%, the purity of the sulfate is more than 97%, and the purity of the chloride salt water is more than 95%; electrolyzing the separated residual water with higher concentration into sulfuric acid and alkali by using a bipolar membrane electrodialysis device, and recycling the sulfuric acid and the alkali for blending acid and alkali in the fracturing fluid;
s7, introducing the concentrated saline chloride into a reverse osmosis device, wherein the concentration of the treated sodium chloride in the water is 8-10%, and the water quality of the urban greening miscellaneous water and the agricultural irrigation water is met; and after reverse osmosis, the water with high chloride concentration is evaporated and crystallized to produce industrial-grade chloride.
In this embodiment, the chloride salt is sodium chloride.
In the embodiment, in the coagulating sedimentation treatment, sludge formed after sedimentation is transported away, and because the three-phase eddy air flotation treatment is performed firstly, the generated sedimentation is less and the required medicine is less.
In step S5, the suspended matter and macromolecular organic matter left after ultrafiltration are subjected to oxidative gel breaking and coagulating sedimentation treatment again, and then are subjected to ultrafiltration again; fully remove organic matters and ensure that the wastewater can be fully utilized to the maximum extent.
The invention relates to a technical scheme that: firstly, primarily settling sand, and then treating by using three-phase vortex air flotation to remove macroscopic large particles, wherein SS (suspended solid) of water is less than or equal to 5mg/L, COD and less than or equal to 1000mg/L, and oil content is less than or equal to 3 mg/L; then degrading macromolecular organic matters into micromolecular organic matters through gel breaking treatment and coagulation treatment, and removing the micromolecular organic matters through coagulation, wherein the removal rate of the organic matters in the wastewater reaches more than 85%; finally, removing a small particle which is difficult to degrade by ultrafiltration, wherein the SS =0mg/L, COD of the treated water is less than or equal to 200 mg/L; and then carrying out nanofiltration to separate sulfate and chloride, and carrying out reverse osmosis on the chloride to obtain usable water and carrying out evaporative crystallization to obtain industrial-grade chloride.
The whole process is very simple, the treated waste water can be greened and recycled, and the salt can form industrial chlorine salt. The simple process makes the corresponding construction floor area only 30% of the floor area of the traditional process.
Claims (7)
1. A process and a treatment system for treating wastewater generated in oil field operation are characterized in that: the method comprises the following steps:
the treatment process comprises the following steps:
s1, primary treatment, namely, firstly, buffering the oil field wastewater in a regulating sedimentation tank to buffer and regulate the water quality, and naturally settling sand;
s2, deoiling;
s21, introducing the water treated in the step S1 into a three-phase vortex air flotation tank, and adding a flocculating agent to fully flocculate impurities in the water;
s22, introducing air into the water, separating out the air from the water in the form of micro bubbles, floating suspended matters, floating oil and missible oil in the water to the water surface along with the micro bubbles, and removing dirt floating to the water surface;
s3, carrying out oxidation gel breaking treatment, namely adding a gel breaking oxidant into the deoiled water, wherein the gel breaking oxidant is mainly prepared from potassium ferrate, sodium hypochlorite and hydrogen peroxide, and oxidizing macromolecular organic matters in the water into micromolecular organic matters by utilizing the strong oxidizing performance of the gel breaking oxidant so as to prevent the pollution and the blockage of a subsequent membrane device;
s4, performing coagulation treatment, namely adding sodium carbonate and a coagulant into the water subjected to the oxidation gel breaking treatment to reduce the hardness and heavy metal ions of the water and adjust the hardness of the water;
s5, performing ultrafiltration treatment, namely introducing water into an ultrafiltration device to further remove suspended matters and macromolecular organic matters in the water, wherein SS =0mg/L, COD of the treated water is not more than 200 mg/L;
s6, nanofiltration treatment, namely introducing the water into a nanofiltration device, separating concentrated sulfate to form water containing chloride salt, wherein the water concentration of the sulfate is 18-20%, the purity of the sulfate is more than 97%, and the purity of the chloride salt water is more than 95%;
s7, introducing the concentrated saline chloride into a reverse osmosis device, wherein the concentration of the treated sodium chloride in the water is 8-10%, and the water quality of the urban greening miscellaneous water and the agricultural irrigation water is met; and after reverse osmosis, the water with high chloride concentration is evaporated and crystallized to produce industrial-grade chloride.
2. The process and system for oilfield operation wastewater treatment according to claim 1, wherein the process comprises: in step S6, water with a relatively high concentration is generated after nanofiltration treatment, and the water is electrolyzed into sulfuric acid and alkali by the bipolar membrane electrodialysis device, and then recovered for acid-base blending of the fracturing fluid.
3. The process and system for oilfield operation wastewater treatment according to claim 2, wherein the process comprises: in step S7, after reverse osmosis, the reverse osmosis apparatus also generates water with high sodium chloride concentration, and industrial-grade sodium chloride is produced by evaporation and crystallization.
4. The process and system for oilfield operation wastewater treatment according to claim 3, wherein the process comprises: in the step S2, SS in the deoiled water is less than or equal to 5mg/L, COD and less than or equal to 1000mg/L, and oil content is less than or equal to 3 mg/L.
5. The process and system for oilfield operation wastewater treatment according to claim 4, wherein the process comprises: the chloride salt is sodium chloride.
6. The process and system for oilfield operation wastewater treatment according to claim 5, wherein the process comprises: the treatment system comprises an adjusting cache tank, a three-phase vortex air flotation tank, an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially connected.
7. The process and system for oilfield operation wastewater treatment according to claim 6, wherein the process comprises: the ultrafiltration device is also connected with the bipolar membrane electrodialysis device.
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| CN113880305A (en) * | 2021-11-01 | 2022-01-04 | 重庆助农生物科技有限公司 | Modular integrated type flowback wastewater treatment system and method |
| CN114105349A (en) * | 2020-12-18 | 2022-03-01 | 内蒙古久科康瑞环保科技有限公司 | Zero-emission resource utilization system and process method of fracturing flow-back fluid |
| CN114560579A (en) * | 2022-03-09 | 2022-05-31 | 内蒙古昇鸿环保科技有限公司 | System and process for synchronously treating produced water and fracturing flowback fluid |
| CN115259429A (en) * | 2021-04-30 | 2022-11-01 | 中国石油天然气股份有限公司 | Processing device for flowback liquid |
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