CN114620882A - Fracturing flow-back fluid treatment system and treatment method thereof - Google Patents
Fracturing flow-back fluid treatment system and treatment method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 13
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- 238000005374 membrane filtration Methods 0.000 claims abstract description 19
- 229910052788 barium Inorganic materials 0.000 claims abstract description 18
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- 239000003513 alkali Substances 0.000 claims description 3
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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
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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
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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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- 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
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
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- C02F2101/20—Heavy metals or heavy metal compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- 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
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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
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Abstract
The invention discloses a fracturing flow-back fluid treatment system and a treatment method thereof, wherein the fracturing flow-back fluid treatment system comprises pretreatment equipment, a membrane filtration system connected with the pretreatment equipment, and an MVR evaporation crystallization system connected with the membrane filtration system; the membrane filtration system comprises a UF system connected with the pretreatment equipment, a DTRO system connected with the UF system, and an RO system connected with the DTRO system; the RO system is also connected with a UF system; the pretreatment equipment comprises a combined air floatation tank, a Fenton oxidation tank, a barium reaction tank, a softening tank, a silicon reaction tank, a coagulation flocculation tank, an inclined tube sedimentation tank, a PH readjustment tank and a sand filter tank which are connected in sequence; the sand filter tank is connected with an UF system. According to the invention, the fracturing flow-back fluid is pretreated and then subjected to membrane filtration for multiple times, so that the fracturing flow-back fluid can be more thoroughly purified and removed, and the environment pollution caused by reinjection of the fracturing flow-back fluid is prevented.
Description
Technical Field
The invention relates to the technical field of fracturing flow-back fluid treatment, in particular to a fracturing flow-back fluid treatment system and a treatment method thereof.
Background
The treatment of the fracturing flow-back fluid is an important link in the petroleum production process, the main treatment of the fracturing flow-back fluid is mainly a centralized station building mode at present, and the treated water is injected back into the stratum. However, the existing flowback liquid treatment process is simple and easy, the flowback liquid treatment is not thorough enough, and the treated flowback liquid still has certain influence on the environment. Based on this, the application provides a processing system and a processing method that can handle the flowing back liquid more thoroughly.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a treatment system and a treatment method capable of more thoroughly treating a flowback liquid.
The purpose of the invention is realized by the following technical scheme: the fracturing flow-back fluid treatment system comprises pretreatment equipment, a membrane filtration system connected with the pretreatment equipment, and an MVR evaporative crystallization system connected with the membrane filtration system; the membrane filtration system comprises a UF system connected with the pretreatment equipment, a DTRO system connected with the UF system, and an RO system connected with the DTRO system; the RO system is also connected with a UF system; the pretreatment equipment comprises a combined air floatation tank, a Fenton oxidation tank, a barium reaction tank, a softening tank, a silicon reaction tank, a coagulation flocculation tank, an inclined tube sedimentation tank, a PH readjustment tank and a sand filter tank which are connected in sequence; the sand filter tank is connected with a UF system.
The fracturing flow-back fluid treatment system also comprises a regulating tank; the adjusting tank is connected with the combined air floatation tank.
The fracturing flow-back fluid treatment system also comprises a sludge dewatering system; the combined air flotation tank, the Fenton oxidation tank, the barium reaction tank, the softening tank and the inclined tube sedimentation tank are all connected with a sludge dewatering system; the sludge dewatering system is also connected with the adjusting tank.
The fracturing flow-back liquid treatment system also comprises a condensed water tank connected with the MVR evaporative crystallization system.
An ultrafiltration water tank is also connected between the UF system and the DTRO system.
A treatment method of a fracturing flow-back fluid treatment system comprises the following steps:
(1) pre-treating; and introducing the fracturing flow-back fluid into pretreatment equipment for pretreatment.
(2) Ultrafiltration; and introducing the pretreated fracturing flow-back fluid into a UF system for ultrafiltration membrane filtration to obtain ultrafiltration concentrated water and ultrafiltration produced water, and returning the ultrafiltration concentrated water to pretreatment equipment.
(3) Sampling and detecting ultrafiltration water production; collecting an ultrafiltration water production sample, and detecting whether the suspended substance in the ultrafiltration water production is less than 1500 mg/l; if yes, executing step (4); otherwise, executing step (5).
(4) Introducing the ultrafiltration product water into an RO system for reverse osmosis filtration to obtain clear water and reverse osmosis concentrated water, and collecting the clear water; and (4) enabling the reverse osmosis concentrated water to enter a DTRO system for secondary reverse osmosis filtration to obtain clear water and secondary reverse osmosis concentrated water, collecting the clear water, and enabling the secondary reverse osmosis concentrated water to enter the step (6).
(5) Introducing the ultrafiltration product water into a DTRO system for reverse osmosis filtration to obtain primary reverse osmosis concentrated water and primary reverse osmosis product water; and (4) introducing the primary reverse osmosis produced water into an RO system for secondary reverse osmosis filtration to obtain secondary reverse osmosis concentrated water and clear water, collecting the clear water, and introducing the primary reverse osmosis concentrated water and the secondary reverse osmosis concentrated water into the step (6).
(6) Evaporating and crystallizing; introducing the concentrated water into an MVR evaporative crystallization system for evaporative crystallization, and recovering crystallized salt and clear water.
Further, the pretreatment in the step (1) comprises the following steps:
and (1.1) sending the fracturing flow-back fluid into a combined air flotation tank to remove oil stains in the fracturing flow-back fluid.
And (1.2) sending the deoiled fracturing flow-back fluid into a Fenton oxidation tank, and adding ferrous sulfate and hydrogen peroxide into the Fenton oxidation tank to remove organic matters in the fracturing flow-back fluid.
And (1.3) sending the fracturing flow-back fluid into a barium reaction tank, adding alkali and sodium sulfate into the barium reaction tank, and removing barium in the fracturing flow-back fluid.
And (1.4) sending the fracturing flow-back fluid into a softening tank and a silicon reaction tank, adding sodium carbonate into the softening tank, and removing calcium, magnesium and silicon in the fracturing flow-back fluid.
And (1.5) flocculating and precipitating the fracturing flow-back fluid to further remove macromolecular substances, calcium, magnesium and silicon in the fracturing flow-back fluid.
(1.6) adjusting the pH value of the fracturing flow-back fluid to 6.5-7, and filtering the fracturing flow-back fluid through a sand filter tank.
Compared with the prior art, the invention has the following advantages and beneficial effects: according to the invention, the fracturing flow-back fluid is pretreated and then subjected to membrane filtration for multiple times, so that the fracturing flow-back fluid can be more thoroughly purified and removed, and the environment pollution caused by reinjection of the fracturing flow-back fluid is prevented.
Drawings
Fig. 1 is a block diagram of a fracturing flow-back fluid treatment system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, the present embodiment discloses a fracturing flow-back fluid treatment system and a treatment method thereof, and the fracturing flow-back fluid treatment system includes a pretreatment device, a membrane filtration system connected to the pretreatment device, and an MVR evaporative crystallization system connected to the membrane filtration system.
Specifically, this pretreatment equipment is including the combination air supporting pond, the fenton oxidation pond, the barium reaction tank, soften pond, silicon reaction tank, coagulation flocculation basin, pipe chute sedimentation tank, PH recalling tank and the sand filtration jar that connect gradually.
The combined air flotation tank is used for removing oil stains in the fracturing flow-back fluid, the Fenton oxidation tank is used for removing organic matters in the fracturing flow-back fluid, the barium reaction tank is used for removing barium ions in the fracturing flow-back fluid, and the softening tank and the silicon reaction tank are used for removing calcium ions, magnesium ions, silicon ions and other ions in the fracturing flow-back fluid. The coagulation flocculation tank and the inclined tube sedimentation tank are used for performing flocculation sedimentation on the fracturing flow-back fluid so as to further remove macromolecular particles, calcium, magnesium, silicon and other substances in the fracturing flow-back fluid. The PH adjusting tank is used for adjusting the PH value of the fracturing flow-back fluid so as to enable the fracturing flow-back fluid to meet the requirement of membrane filtration. The sand filter tank is used for removing a small amount of incompletely precipitated suspended matters in the sedimentation tank, and reducing the pollution of suspended matters and colloid on the subsequent membrane filtration, and the sand filter tank adopts a quartz sand filter.
The pretreatment equipment also comprises an adjusting tank, wherein the adjusting tank is connected with the combined air floatation tank, and the fracturing flow-back fluid is adjusted in water quality and water quantity by the adjusting tank before entering the combined air floatation tank.
In addition, the pretreatment equipment also comprises a sludge dewatering system. The combined air flotation tank, the Fenton oxidation tank, the barium reaction tank, the softening tank and the inclined tube sedimentation tank are all connected with a sludge dewatering system. And pumping the sludge generated in the combined air floatation tank, the Fenton oxidation tank, the barium reaction tank, the softening tank and the inclined tube sedimentation tank into a sludge dewatering system for dewatering treatment, wherein the sludge dewatering system is also connected with an adjusting tank, and the sewage generated in the dewatering process returns to the adjusting tank.
The membrane filtration system comprises a UF system connected with the sand filter tank, a DTRO system connected with the UF system, and an RO system connected with the DTRO system. The RO system is also connected with a UF system; the sand filter tank is connected with a UF system.
The MVR evaporative crystallization system is also connected with a condensed water tank, and clear water generated by evaporative crystallization enters the condensed water tank for condensation. An ultrafiltration water tank is connected between the UF system and the DTRO system and used for storing filtered water generated after the UF system is filtered.
When in use, the treatment method of the fracturing flow-back fluid treatment system comprises the following steps:
(1) pre-treating; and introducing the fracturing flow-back fluid into pretreatment equipment for pretreatment. The method specifically comprises the following steps:
(1.1) sending the fracturing flow-back fluid into an adjusting tank, and adjusting the water quality and the water quantity of the fracturing flow-back fluid; and sending the fracturing flow-back fluid into a combined air flotation tank after the adjustment is finished, and removing oil stains in the fracturing flow-back fluid.
And (1.2) feeding the deoiled fracturing flowback fluid into a Fenton oxidation tank, and adding ferrous sulfate and hydrogen peroxide into the Fenton oxidation tank to remove organic matters in the fracturing flowback fluid.
(1.3) sending the fracturing flow-back fluid into a barium reaction tank, adding alkali and sodium sulfate into the barium reaction tank, and removing barium in the fracturing flow-back fluid.
(1.4) sending the fracturing flow-back fluid into a softening tank and a silicon reaction tank, adding sodium carbonate into the softening tank, and removing calcium, magnesium and silicon in the fracturing flow-back fluid.
And (1.5) flocculating and precipitating the fracturing flow-back fluid to further remove macromolecular substances, calcium, magnesium and silicon in the fracturing flow-back fluid.
(1.6) adjusting the pH value of the fracturing flow-back fluid to 6.5-7, adjusting the pH value of the fracturing flow-back fluid to 7 in the embodiment, and filtering the fracturing flow-back fluid through a sand filter tank to complete the pretreatment of the fracturing flow-back fluid.
(2) And (3) introducing the pretreated fracturing flow-back fluid into a UF system for ultrafiltration membrane filtration to obtain ultrafiltration concentrated water and ultrafiltration produced water, and returning the ultrafiltration concentrated water to the step (1) for circulation treatment.
(3) Collecting an ultrafiltration water production sample, and detecting whether the suspended substance in the ultrafiltration water production is less than 1500 mg/l; if yes, executing step (4); otherwise, executing step (5).
(4) And (3) introducing the ultrafiltration product water into an RO system for reverse osmosis filtration to obtain clear water and reverse osmosis concentrated water, and collecting the clear water. And (4) the reverse osmosis concentrated water enters a DTRO system for secondary reverse osmosis filtration to obtain clear water and secondary reverse osmosis concentrated water, the clear water is collected, and the secondary reverse osmosis concentrated water enters the step (6).
(5) And introducing the ultrafiltration product water into a DTRO system for reverse osmosis filtration to obtain primary reverse osmosis concentrated water and primary reverse osmosis product water. And (4) introducing the primary reverse osmosis produced water into an RO system for secondary reverse osmosis filtration to obtain secondary reverse osmosis concentrated water and clear water, collecting the clear water, and introducing the primary reverse osmosis concentrated water and the secondary reverse osmosis concentrated water into the step (6).
(6) Introducing the concentrated water into an MVR evaporative crystallization system for evaporative crystallization, and recovering crystallized salt and clear water.
As described above, the present invention can be preferably realized.
Claims (7)
1. The fracturing flow-back fluid treatment system is characterized by comprising pretreatment equipment, a membrane filtration system connected with the pretreatment equipment, and an MVR evaporative crystallization system connected with the membrane filtration system; the membrane filtration system comprises a UF system connected with the pretreatment equipment, a DTRO system connected with the UF system, and an RO system connected with the DTRO system; the RO system is also connected with a UF system; the pretreatment equipment comprises a combined air floatation tank, a Fenton oxidation tank, a barium reaction tank, a softening tank, a silicon reaction tank, a coagulation flocculation tank, an inclined tube sedimentation tank, a PH readjustment tank and a sand filter tank which are connected in sequence; the sand filter tank is connected with a UF system.
2. The frac flowback fluid treatment system of claim 1, further comprising a conditioning tank; the adjusting tank is connected with the combined air floatation tank.
3. The frac flowback fluid treatment system of claim 2, further comprising a sludge dewatering system; the combined air flotation tank, the Fenton oxidation tank, the barium reaction tank, the softening tank and the inclined tube sedimentation tank are all connected with a sludge dewatering system; the sludge dewatering system is also connected with the adjusting tank.
4. The frac flowback fluid treatment system of claim 3, further comprising a condensate tank connected to the MVR evaporative crystallization system.
5. The frac flowback fluid treatment system of claim 4, wherein an ultrafiltration water tank is further connected between the UF system and the DTRO system.
6. A treatment method of the fracturing flow-back fluid treatment system based on any one of claims 1 to 4, characterized by comprising the following steps:
(1) pre-treating; introducing the fracturing flow-back fluid into pretreatment equipment for pretreatment;
(2) ultrafiltration; introducing the pretreated fracturing flow-back fluid into a UF system for ultrafiltration membrane filtration,
obtaining ultrafiltration concentrated water and ultrafiltration produced water, and returning the ultrafiltration concentrated water to pretreatment equipment;
(3) sampling and detecting ultrafiltration water production; collecting an ultrafiltration water production sample, and detecting whether the suspended substance in the ultrafiltration water production is less than 1500 mg/l; if yes, executing step (4); if not, executing the step (5);
(4) introducing the ultrafiltration product water into an RO system for reverse osmosis filtration to obtain clear water and reverse osmosis concentrated water,
collecting clear water; the reverse osmosis concentrated water enters a DTRO system for secondary reverse osmosis filtration to obtain clear water and secondary reverse osmosis concentrated water, the clear water is collected, and the secondary reverse osmosis concentrated water enters the step (6);
(5) introducing the ultrafiltration product water into a DTRO system for reverse osmosis filtration to obtain primary reverse osmosis concentrated water and primary reverse osmosis product water; introducing the primary reverse osmosis produced water into an RO system for secondary reverse osmosis filtration to obtain secondary reverse osmosis concentrated water and clear water, collecting the clear water, and introducing the primary reverse osmosis concentrated water and the secondary reverse osmosis concentrated water into the step (6);
(6) evaporating and crystallizing; introducing the concentrated water into an MVR evaporative crystallization system for evaporative crystallization, and recovering crystallized salt and clear water.
7. The method of claim 6, wherein the pre-treatment in step (1) comprises the steps of:
(1.1) sending the fracturing flow-back fluid into a combined air flotation tank to remove oil stains in the fracturing flow-back fluid;
(1.2) feeding the deoiled fracturing flow-back fluid into a Fenton oxidation tank, and adding ferrous sulfate and hydrogen peroxide into the Fenton oxidation tank to remove organic matters in the fracturing flow-back fluid;
(1.3) sending the fracturing flow-back fluid into a barium reaction tank, adding alkali and sodium sulfate into the barium reaction tank, and removing barium in the fracturing flow-back fluid;
(1.4) conveying the fracturing flow-back fluid into a softening tank and a silicon reaction tank, adding sodium carbonate into the softening tank, and removing calcium, magnesium and silicon in the fracturing flow-back fluid;
(1.5) flocculating and precipitating the fracturing flow-back fluid to further remove macromolecular substances, calcium, magnesium and silicon in the fracturing flow-back fluid;
(1.6) adjusting the pH value of the fracturing flow-back fluid to 6.5-7, and filtering the fracturing flow-back fluid through a sand filter tank.
Priority Applications (1)
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| CN112919719A (en) * | 2021-04-06 | 2021-06-08 | 杭州上拓环境科技股份有限公司 | Treatment system and treatment method for shale gas fracturing flowback wastewater |
| CN113200646A (en) * | 2021-05-12 | 2021-08-03 | 内蒙古久科康瑞环保科技有限公司 | Resource treatment method and system for fracturing flowback fluid |
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| CN112919719A (en) * | 2021-04-06 | 2021-06-08 | 杭州上拓环境科技股份有限公司 | Treatment system and treatment method for shale gas fracturing flowback wastewater |
| CN113200646A (en) * | 2021-05-12 | 2021-08-03 | 内蒙古久科康瑞环保科技有限公司 | Resource treatment method and system for fracturing flowback fluid |
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