CN115304197A - Fracturing flow-back fluid treatment device and method - Google Patents
Fracturing flow-back fluid treatment device and method Download PDFInfo
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- CN115304197A CN115304197A CN202110492407.0A CN202110492407A CN115304197A CN 115304197 A CN115304197 A CN 115304197A CN 202110492407 A CN202110492407 A CN 202110492407A CN 115304197 A CN115304197 A CN 115304197A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
-
- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F2001/007—Processes including a sedimentation step
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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
- 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
- C02F2303/00—Specific treatment goals
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The embodiment of the application discloses a fracturing flow-back fluid treatment device and method, and belongs to the technical field of waste liquid treatment. The device comprises an electrolytic bath, a buffer device, an ultrasonic pipeline mixer, a settling tank, a sludge dewatering device, an electrode plate, a variable-frequency direct-current adjustable-pole power supply, a medicament filling system and a settling inclined tube; the electrolytic tank, the buffer device, the ultrasonic pipeline mixer and the settling tank are connected in sequence; the electrode plate is arranged in the electrolytic bath, and the variable-frequency direct-current adjustable-pole power supply is connected with the power interface of the electrode plate; the medicament filling system is connected with the ultrasonic pipeline mixer; the sedimentation inclined pipe is positioned in the sedimentation tank and is not higher than the liquid inlet of the sedimentation tank; the sludge dewatering device is positioned at the bottom of the settling tank. The device has short treatment flow, reduces the scaling rate in the device, and improves the separation effect by combining electric flocculation, chemical flocculation and ultrasonic treatment.
Description
Technical Field
The application relates to the technical field of waste liquid treatment, in particular to a fracturing flow-back fluid treatment device and method.
Background
The shale gas is developed by adopting a hydraulic fracturing technology. After fracturing construction is finished, the fracturing fluid injected into the stratum by the pump is discharged back to the ground to become fracturing flow-back fluid. The fracturing flow-back fluid contains various fracturing fluid additives, stratum ions, mechanical impurities and the like, and cannot be directly discharged. And the fracturing flow-back fluid can be discharged after being subjected to harmless treatment and recycling (recycling) or being subjected to harmless treatment and reaching the standard. At present, treatment processes such as suspended matter removal, hardness reduction, sterilization and the like are required to be carried out for treating and recycling the fracturing flow-back fluid and discharging the treated fracturing flow-back fluid.
In the related technology, chemical flocculation and/or electric flocculation are mainly adopted for flocculation sedimentation to remove suspended matters, and the content of the suspended matters is further reduced through multi-stage filtration; reducing the content of high-valence metal ions by chemical precipitation and/or ion exchange resin; sterilizing by using a bactericide and/or ultraviolet sterilization; the oxidation and the membrane treatment are mainly used for discharging the sewage after reaching the standard after the sewage is subjected to advanced treatment. Among them, chemical flocculation sedimentation, multi-stage filtration and sterilization with bactericide are more in industrial application. In the related art, each flocculation requires sedimentation, and the chemical precipitation, chemical flocculation, sterilization and scale prevention processes require at least 3 water treatment units, and particularly, the scale prevention treatment requires multiple additions of scale inhibitors and pH regulators.
The related technology has long treatment process, the electric flocculation electrode plate has serious scaling, and the subsequent treatment pipelines, valves and subsequent process flows after chemical precipitation have serious scaling, so that the fracturing flow-back fluid treatment device is blocked for a long time, and is frequently deblocked and backwashed; the pure chemical flocculation and chemical precipitation methods have large medicament usage amount, and the electric flocculation method has poor separation effect on impurities; the ion exchange resin adopted in the related technology has strong selectivity to high-valence metal ions, and has large dosage and high cost when treating high-hardness fracturing flowback fluid.
Disclosure of Invention
The embodiment of the application provides a fracturing flow-back fluid treatment device and method, and aims to solve the problems that in the related art, the device is seriously scaled, the separation effect is poor, and the ion exchange resin has strong selectivity on high-valence metal ions and is high in cost. The technical scheme is as follows:
on the one hand, the fracturing flow-back fluid treatment device comprises an electrolytic tank, a buffer device, an ultrasonic pipeline mixer, a settling tank, a sludge dewatering device, an electrode plate, a variable-frequency direct-current adjustable-pole power supply, a medicament filling system and a settling inclined tube;
the electrolytic tank, the buffer device, the ultrasonic pipeline mixer and the settling tank are sequentially connected, and the electrolytic tank is used for enabling the fracturing flow-back liquid to be subjected to electric flocculation; the buffer device is used for buffering flow fluctuation in the fracturing flow-back fluid treatment device;
the electrode plate is arranged in the electrolytic bath, the variable-frequency direct-current adjustable-pole power supply is connected with a power interface of the electrode plate and is used for adjusting the current and automatically exchanging the positive pole and the negative pole of the electrode plate according to reference time;
the ultrasonic pipeline mixer is used for providing a place for chemical precipitation and chemical flocculation, inhibiting equipment scaling caused by scaling substances by adopting ultrasonic waves, and sterilizing the fracturing flow-back fluid; the medicament filling system is connected with the ultrasonic pipeline mixer and is used for filling medicaments for chemical precipitation and chemical flocculation into the ultrasonic pipeline mixer;
the sedimentation inclined pipe is positioned in the sedimentation tank and is not higher than the liquid inlet of the sedimentation tank;
the sludge dewatering device is positioned at the bottom of the settling tank, and the settling tank is used for separating flocs and clear liquid in the fracturing flow-back fluid; the sludge dewatering device is used for dewatering and separating sludge at the bottom of the settling tank.
Optionally, the electrode plate comprises at least two flat-plate-shaped electrodes; the at least two flat-plate electrodes are vertically arranged in the electrolytic bath in parallel; the positive and negative poles of two adjacent electrodes are opposite.
Optionally, the electrolytic cell is of a cuboid structure and comprises an electrolytic cell water inlet and an electrolytic cell water outlet; the water inlet and the water outlet of the electrolytic cell are distributed at two ends of a diagonal line of the electrolytic cell, and the position of the water inlet of the electrolytic cell is lower than that of the water outlet of the electrolytic cell.
Optionally, the buffer device comprises a buffer tank and a pump; the water inlet of the buffer tank is arranged at the top of the buffer tank, and the water outlet of the buffer tank is arranged at the bottom of the buffer tank; the water inlet of the buffer tank is connected with the electrolytic bath through a pipeline; the water outlet of the buffer tank is connected with the liquid suction end of the pump through a pipeline; and the liquid discharge end of the pump is connected with the ultrasonic pipeline mixer.
Optionally, the top of the settling tank is provided with a liquid outlet; the bottom of the settling tank is provided with a sludge outlet which is connected with the sludge dewatering device; the middle part of the settling tank is provided with a liquid inlet.
Optionally, the lower part of the settling tank is funnel-shaped, and the upper part of the settling tank is one of a cuboid, a cube or a cylinder with an open top.
Optionally, the electrode plate is made of one or more of aluminum, iron, aluminum alloy and steel.
The embodiment of the application also provides a fracturing flow-back fluid treatment method, which at least comprises the following steps:
pumping the fracturing flow-back fluid to be treated into the electrolytic bath, switching on the current of the electrode plate through the variable-frequency direct-current adjustable-pole power supply, exchanging a positive electrode and a negative electrode of the electrode plate according to reference time, and performing electric flocculation treatment on the fracturing flow-back fluid;
the fracturing flow-back fluid after the electric flocculation enters the buffer device from the electrolytic bath, is buffered by the buffer device and then enters the ultrasonic wave pipeline mixer;
starting the ultrasonic pipeline mixer, pumping the chemical for chemical precipitation and chemical flocculation into the ultrasonic pipeline mixer through the chemical filling system, and mixing the chemical with fracturing flowback liquid entering the ultrasonic pipeline mixer; carrying out chemical precipitation and chemical flocculation on the fracturing flow-back fluid under the action of the medicament; under the action of ultrasonic waves, scale forming substances are not easy to adhere to scale, and the fracturing flowback fluid is sterilized through the ultrasonic waves;
settling the fracturing flow-back fluid treated by the ultrasonic pipeline mixer in the settling tank; further settling flocs and precipitates which are agglomerated in the fracturing flow-back liquid through the settling inclined tube in the settling tank, and discharging separated clear liquid from the settling tank to obtain treated clear liquid;
and the sludge settled at the bottom of the settling tank is dewatered by the sludge dewatering device.
Optionally, the agent for chemical precipitation and chemical flocculation pumped by the agent filling system comprises a chemical precipitator, the chemical precipitator being one or more of sodium carbonate, sodium hydroxide, potassium hydroxide.
Optionally, the agent for chemical flocculation and chemical flocculation pumped through the agent priming system further comprises an organic flocculant, the organic flocculant comprising one or more of polyacrylamide and derivatives thereof.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the fracturing flow-back fluid treatment device provided by the embodiment of the application combines the settling tank, the settling inclined pipe and the sludge dewatering device, so that the settling processes of electric flocculation and chemical flocculation are integrated, and the settling flow is shortened; chemical precipitation, chemical flocculation, scale prevention and sterilization are synchronously performed in one water treatment unit by combining a medicament filling system and an ultrasonic pipeline mixer, and the processes of adding a scale inhibitor and a pH regulator for multiple times are avoided, so that the chemical precipitation, chemical flocculation, scale prevention and sterilization processes of the fracturing flowback fluid are shortened; the scaling rate of the electrode plate in the electrocoagulation process is reduced by combining the electrolytic bath with a variable-frequency direct-current adjustable electrode power supply; the ultrasonic pipeline mixer is used for reducing the scaling influence of chemical precipitation on subsequent treatment pipelines, valves and subsequent process flows, avoiding the influence of an antiscaling agent on the pH value of the fracturing flowback fluid and omitting the treatment flow of pH adjustment; the device replaces ion exchange resin with electric flocculation, chemical precipitation and chemical flocculation to reduce the selectivity of high-valence metal ions in the fracturing flow-back fluid, thereby reducing the cost of separating the high-valence metal ions.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a fracturing flow-back fluid treatment device provided in an embodiment of the present application.
The reference numerals in the drawings denote:
1-an electrolytic cell;
11-water inlet of electrolytic bath; 12-water outlet of the electrolytic bath;
2-a buffer device;
3-ultrasonic wave pipeline mixer;
4, a settling tank;
41-liquid outlet; 42-sludge outlet;
5-a sludge dewatering device;
6, electrode plates;
7-variable frequency direct current adjustable pole power supply;
8-a medicament filling system;
9-settling inclined tube.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a fracturing flow-back fluid treatment device, and as shown in fig. 1, the device comprises an electrolytic tank 1, a buffer device 2, an ultrasonic pipeline mixer 3, a settling tank 4, a sludge dewatering device 5, an electrode plate 6, a variable-frequency direct-current adjustable-pole power supply 7, a medicament filling system 8 and a settling inclined tube 9.
The electrolytic tank 1, the buffer device 2, the ultrasonic pipeline mixer 3 and the settling tank 4 are sequentially connected, and the electrolytic tank 1 is used for enabling the fracturing flow-back liquid to be subjected to electric flocculation; the buffer device 2 is used for buffering the flow fluctuation in the fracturing flow-back fluid treatment device. The electrode plate 6 is arranged in the electrolytic cell 1, the variable-frequency direct-current adjustable-pole power supply 7 is connected with a power interface of the electrode plate 6, the variable-frequency direct-current adjustable-pole power supply 7 is used for adjusting the current and automatically exchanging the positive pole and the negative pole of the electrode plate 6 according to the reference time.
The ultrasonic pipeline mixer 3 is used for providing a place for chemical precipitation and chemical flocculation, inhibiting equipment scaling caused by scaling substances by adopting ultrasonic waves and sterilizing the fracturing flow-back fluid; and the medicament filling system 8 is connected with the ultrasonic pipeline mixer 3 and is used for filling medicaments for chemical precipitation and chemical flocculation into the ultrasonic pipeline mixer 3. The sedimentation inclined pipe 9 is positioned inside the sedimentation tank 4, and the sedimentation inclined pipe 9 is not higher than the liquid inlet of the sedimentation tank 4. The sludge dewatering device 5 is positioned at the bottom of the settling tank 4, and the settling tank 4 is used for separating flocs and clear liquid in the fracturing flow-back fluid; the sludge dewatering device 5 is used for dewatering and separating sludge at the bottom of the settling tank 4.
Illustratively, the fouling of equipment caused by the fracturing flowback fluid is divided into two cases, namely, the fouling substances contained in the fracturing flowback fluid attach to the equipment to form the fouling; the other is that the scaling substances generated by the fracturing flowback liquid under the action of the chemical agent for chemical precipitation and chemical flocculation are attached to the equipment for scaling.
As shown in fig. 1, an alternative implementation of the fracturing flow-back fluid treatment apparatus provided in the embodiment of the present application is as follows:
pumping the fracturing flowback fluid to be treated into the electrolytic bath 1, and then connecting a power supply of an electrode plate 6 in the electrolytic bath 1. The electrode plates 6 are supplied with variable frequency direct current by a variable frequency direct current adjustable electrode power supply 7, so that an electric field is generated between the electrodes of the electrode plates 6. After the fracturing flowback fluid enters the electrolytic cell 1, electric flocculation occurs between the electrodes of the electrode plate 6. The fracturing flow-back fluid after the electric flocculation treatment enters the buffer device 2 from the electrolytic bath 1, and flocs generated by the electric flocculation enter the subsequent buffer device 2 under the action of water flow and cannot settle at the bottom of the electrolytic bath 1. The fracturing flowback fluid flowing out of the electrolytic bath 1 is buffered in the buffer device 2 for flow fluctuation and then enters the ultrasonic wave pipeline mixer 3. And injecting the medicament into the ultrasonic pipeline mixer 3 through a medicament injection system 8 to be mixed with the fracturing flow-back fluid. The fracturing flow-back fluid is subjected to chemical precipitation and chemical flocculation in the ultrasonic pipeline mixer 3 under the action of the medicament. Meanwhile, the ultrasonic wave pipeline mixer 3 sends out ultrasonic waves to inhibit the scaling substances contained in the fracturing flow-back fluid and the scaling substances generated by the medicament from scaling the equipment, and the fracturing flow-back fluid is sterilized. The fracturing flow-back fluid enters a settling tank 4 after being treated by an ultrasonic pipeline mixer 3, and is settled in the settling tank 4 to separate flocs and precipitates in the fracturing flow-back fluid from clear liquid. The sedimentation inclined tube 9 in the sedimentation tank 4 accelerates the sedimentation rate of the fracturing flow-back fluid, and flocs and sediments in the fracturing flow-back fluid are condensed into large clusters in the sedimentation inclined tube 9 and are settled at the bottom of the sedimentation tank 4. The sludge at the bottom of the settling tank 4 is dewatered by a sludge dewatering device 5.
Illustratively, the fracturing flow-back fluid treatment device provided by the embodiment of the application is mounted in a skid-mounted manner, and the electrolytic tank 1, the buffer device 2, the ultrasonic pipeline mixer 3, the settling tank 4, the sludge dewatering device 5, the electrode plate 6, the variable-frequency direct-current adjustable-pole power supply 7, the medicament filling system 8 and the settling inclined tube 9 can be integrally mounted and directly connected with field supporting facilities through pipelines during use.
In an alternative embodiment, the electrode plate 6 of the fracturing flow-back fluid treatment device provided in the embodiment of the present application includes at least two plate-shaped electrodes; at least two flat-shaped electrodes are vertically arranged in the electrolytic bath 1 in parallel, and the anode and the cathode of two adjacent flat-shaped electrodes are different.
Illustratively, the embodiments of the fracturing flow-back fluid treatment device provided in the examples of the present application are as follows:
the device comprises an electrolytic tank 1, a buffer device 2, an ultrasonic wave pipeline mixer 3, a settling tank 4, a sludge dewatering device 5, an electrode plate 6, a variable-frequency direct-current adjustable-pole power supply 7, a medicament filling system 8 and a settling inclined tube 9.
The electrolytic tank 1, the buffer device 2, the ultrasonic pipeline mixer 3 and the settling tank 4 are connected in sequence. The electrode plate 6 is arranged in the electrolytic bath 1, and the variable-frequency direct-current adjustable-pole power supply 7 is connected with a power interface of the electrode plate 6. The medicament filling system 8 is connected with the ultrasonic pipeline mixer 3. The sedimentation inclined pipe 9 is positioned inside the sedimentation tank 4, and the sedimentation inclined pipe 9 is not higher than the liquid inlet of the sedimentation tank 4. The sludge dewatering device 5 is positioned at the bottom of the settling tank 4.
Wherein, the electrode plate 6 comprises at least two flat electrodes; at least two flat-shaped electrodes are mutually parallel and vertically arranged in the electrolytic cell 1, and the positive and negative poles of two adjacent flat-shaped electrodes are different. When the fracturing flow-back fluid is electrically flocculated in the electrolytic bath 1, the power interface of the electrode plate 6 is connected with the variable-frequency direct-current adjustable-pole power supply 7. If the variable-frequency direct-current adjustable-pole power supply 7 changes the positive pole and the negative pole of the electrode plate 6, at least two flat-plate-shaped electrodes are correspondingly changed, the positive pole and the negative pole of two adjacent electrodes are exchanged, and the direction of an electric field between the two adjacent electrodes is also exchanged. The scale-forming substances such as metal ions in the fracturing flowback fluid, which migrate to the vicinity of the original cathode, migrate to the new cathode (the original anode) under the action of the new electric field. Therefore, the positive electrode and the negative electrode between two adjacent electrodes are periodically changed to prevent the scaling substances in the fracturing flowback fluid from attaching to at least two flat electrodes, so that the precipitates and the flocs generated by the electric flocculation cannot attach to the electrode plates 6 to scale.
And the sediment and the floc between two adjacent electrodes of the electrode plate 6 enter the buffer device 2 along with the fracturing flowback liquid. The fracturing flow-back fluid is buffered in the buffer device 2, flows into the ultrasonic wave pipeline mixer 3 after being buffered. And injecting the medicament into the ultrasonic pipeline mixer 3 through the medicament injection system 8 to be mixed with the fracturing flow-back fluid. The fracturing flow-back fluid is subjected to chemical precipitation and chemical flocculation under the action of a medicament. Meanwhile, the ultrasonic wave pipeline mixer 3 sends out ultrasonic waves to inhibit equipment scaling caused by scaling substances and sterilize the fracturing flow-back fluid. The fracturing flow-back fluid enters a settling tank 4 after being treated by an ultrasonic pipeline mixer 3, and is settled in the settling tank 4 to separate flocs and precipitates in the fracturing flow-back fluid from clear liquid. The sedimentation inclined tube 9 in the sedimentation tank 4 accelerates the sedimentation rate of the fracturing flow-back fluid, and flocs and sediments in the fracturing flow-back fluid are condensed into large clusters in the sedimentation inclined tube 9 and are settled at the bottom of the sedimentation tank 4. The sludge at the bottom of the settling tank 4 is dewatered by a sludge dewatering device 5.
In an alternative embodiment, as shown in fig. 1, an electrolytic cell 1 of the fracturing flow-back fluid treatment device provided in the embodiment of the present application is a rectangular parallelepiped structure, and the electrolytic cell 1 includes an electrolytic cell water inlet 11 and an electrolytic cell water outlet 12. Wherein, the water inlet 11 and the water outlet 12 of the electrolytic cell are distributed at two ends of a diagonal line of the electrolytic cell 1. The position of the water inlet 11 of the electrolytic cell is lower than the position of the water outlet 12 of the electrolytic cell, so that the electric flocculation reaction of the fracturing flowback fluid is more sufficient, and flocs and sediments in the fracturing flowback fluid are not precipitated under the action of water flow.
Illustratively, the electrolyzer water inlet 11 and the electrolyzer water outlet 12 are located on the bottom corner and the top corner, respectively, of different sides of two opposite sides of the electrolyzer 1. That is, the electrolytic tank water inlet 11 and the electrolytic tank water outlet 12 are located at the farthest positions in the electrolytic tank 1, so that the electric flocculation of the fracturing flowback fluid is more sufficient.
Illustratively, the embodiments of the fracturing flow-back fluid treatment device provided in the examples of the present application are as follows:
the utility model provides a flowing back processing apparatus's electrolysis trough 1 is returned to fracturing is the cuboid structure, and electrolysis trough 1 includes electrolysis trough water inlet 11 and electrolysis trough delivery port 12. Wherein, the water inlet 11 and the water outlet 12 of the electrolytic cell are distributed at two ends of a diagonal line of the electrolytic cell 1. The position of the water inlet 11 of the electrolytic tank is lower than the position of the water outlet 12 of the electrolytic tank. Pumping the fracturing flow-back fluid to be treated into the electrolytic bath 1 from the electrolytic bath water inlet 11 at the bottom of the electrolytic bath 1, and then connecting the power supply of the electrode plate 6 in the electrolytic bath 1. The electrode plates 6 are supplied with variable frequency direct current by a variable frequency direct current adjustable electrode power supply 7, so that an electric field is generated between the electrodes of the electrode plates 6. After the fracturing flowback liquid enters the electrolytic cell 1, electric flocculation occurs between gaps of electrodes of the electrode plate 6. Because the water inlet 11 and the water outlet 12 of the electrolytic cell are positioned at two ends of a diagonal line of the electrolytic cell 1, the path of the fracturing flow-back fluid from the inlet to the overflow electrolytic cell 1 is longer, and the electric flocculation reaction is more sufficient. The fracturing flow-back fluid subjected to the electric flocculation treatment overflows from the water outlet 12 of the electrolytic cell 1 at the top to enter the buffer device 2, and flocs generated by the electric flocculation enter the subsequent buffer device 2 under the action of the fracturing flow-back fluid overflowing from bottom to top, and cannot settle at the bottom of the electrolytic cell 1 under the action of gravity.
The fracturing flow-back fluid is buffered in the buffer device 2 for flow fluctuation and then enters the ultrasonic wave pipeline mixer 3. And injecting the medicament into the ultrasonic pipeline mixer 3 through the medicament injection system 8 to be mixed with the fracturing flow-back fluid. The fracturing flow-back fluid is subjected to chemical precipitation and chemical flocculation under the action of a medicament. Meanwhile, the ultrasonic wave pipeline mixer 3 sends out ultrasonic waves to inhibit equipment scaling caused by scaling substances and carries out sterilization treatment on the fracturing flow-back fluid. The fracturing flow-back fluid enters a settling tank 4 after being treated by an ultrasonic pipeline mixer 3, and is settled in the settling tank 4 to separate flocs and precipitates in the fracturing flow-back fluid from clear liquid. The sedimentation inclined tube 9 in the sedimentation tank 4 accelerates the sedimentation rate of the fracturing flow-back fluid, and flocs and sediments in the fracturing flow-back fluid are condensed into large clusters in the sedimentation inclined tube 9 and are settled at the bottom of the sedimentation tank 4. The sludge at the bottom of the settling tank 4 is dehydrated by a sludge dehydrating device 5.
In an alternative embodiment, the buffering device 2 of the fracturing flow-back fluid treatment device provided by the embodiment of the application comprises a buffering tank and a pump; the water inlet of the buffer tank is arranged at the top of the buffer tank, and the water outlet of the buffer tank is arranged at the bottom of the buffer tank; the water inlet of the buffer tank is connected with the water outlet 12 of the electrolytic bath through a pipeline; the water outlet of the buffer tank is connected with the liquid suction end of the pump through a pipeline; the discharge end of the pump is connected with an ultrasonic pipeline mixer 3. The pump of the buffer device 2 is used for pumping the liquid in the buffer tank into the ultrasonic pipeline mixer 3.
Illustratively, the fracturing flow-back fluid to be treated is pumped into the electrolytic cell 1, and then the power supply of the electrode plates 6 in the electrolytic cell 1 is switched on. The variable frequency direct current is provided to the electrode plate 6 by the variable frequency direct current adjustable electrode power supply 7, so that an electric field is generated between the electrodes of the electrode plate 6. After the fracturing flowback fluid enters the electrolytic bath 1, electric flocculation occurs between gaps of electrodes of the electrode plate 6. The fracturing flow-back fluid after the electric flocculation treatment flows into the buffer device 2 from the electrolytic bath 1. The buffer tank of the buffer device 2 inhibits the flow fluctuation generated when the fracturing flow-back fluid enters the buffer device 2 from the electrolytic bath 1, and the pump of the buffer device 2 sucks the buffered fracturing flow-back fluid and then pumps the fracturing flow-back fluid into the ultrasonic wave pipeline mixer 3. Illustratively, the displacement of the pump is equal to the displacement of the water inlet 11 of the electrolytic bath, so that the liquid discharge rate of the buffer device 2 is consistent with the liquid inlet rate of the electrolytic bath 1, and the operation of the fracturing flowback liquid treatment device provided by the embodiment of the application is more stable.
Illustratively, as shown in fig. 1, the embodiment of the fracturing flowback fluid treatment apparatus provided in the embodiment of the present application is as follows:
the device comprises an electrolytic tank 1, a buffer device 2, an ultrasonic wave pipeline mixer 3, a settling tank 4, a sludge dewatering device 5, an electrode plate 6, a variable-frequency direct-current adjustable-pole power supply 7, a medicament filling system 8 and a settling inclined tube 9.
The electrolytic tank 1, the buffer device 2, the ultrasonic pipeline mixer 3 and the settling tank 4 are connected in sequence. The electrode plate 6 is arranged in the electrolytic bath 1, and the variable-frequency direct-current adjustable-pole power supply 7 is connected with a power interface of the electrode plate 6. The medicament filling system 8 is connected with the ultrasonic pipeline mixer 3. The settler chute 9 is located inside the settler 4. The sludge dewatering device 5 is positioned at the bottom of the settling tank 4.
Wherein, the buffer device 2 comprises a buffer tank and a pump; the water inlet of the buffer tank is arranged at the top of the buffer tank, and the water outlet of the buffer tank is arranged at the bottom of the buffer tank; the water inlet of the buffer tank is connected with the water outlet 12 of the electrolytic bath through a pipeline; the water outlet of the buffer tank is connected with the liquid suction end of the pump through a pipeline; the liquid discharge end of the pump is connected with the ultrasonic pipeline mixer 3. The pump of the buffer device 2 is used for pumping the liquid in the buffer tank into the ultrasonic pipeline mixer 3.
Pumping the fracturing flowback fluid to be treated into the electrolytic cell 1, and then connecting a power supply of an electrode plate 6 in the electrolytic cell 1. The variable frequency direct current adjustable electrode power supply 7 provides variable frequency direct current to the electrode plate 6, so that an electric field is generated between the electrodes of the electrode plate 6. After the fracturing flowback fluid enters the electrolytic cell 1, electric flocculation occurs between the electrodes of the electrode plate 6. The fracturing flow-back fluid after the electric flocculation treatment enters a buffer tank of the buffer device 2 from the electrolytic bath 1, and flocs generated by the electric flocculation enter the subsequent buffer device 2 under the action of water flow and cannot settle at the bottom of the electrolytic bath 1.
After the fracturing flow-back fluid is buffered in the buffer tank for flow fluctuation, the fracturing flow-back fluid is pumped into the ultrasonic pipeline mixer 3 by a pump of the buffer device 2. And pumping the medicament in the medicament filling system 8 into the ultrasonic pipeline mixer 3, mixing the medicament with the fracturing flow-back fluid in the ultrasonic pipeline mixer 3, and performing chemical precipitation and chemical flocculation on the fracturing flow-back fluid. Meanwhile, the ultrasonic wave pipeline mixer 3 sends out ultrasonic waves to inhibit equipment scaling caused by scaling substances and carries out sterilization treatment on the fracturing flow-back fluid. The fracturing flow-back fluid carries agglomerated flocs and precipitates into the settling tank 4. The fracturing flow-back fluid is settled in a settling tank 4. The agglomerated flocs and precipitates in the fracturing flow-back fluid are further settled in the settling inclined tube 9 to form large agglomerates, and are compacted and settled at the bottom of the settling tank 4. The separated clear liquid enters the upper part of the settling tank 4 to obtain the clear liquid which can be reused or discharged after further advanced treatment. The sludge settled at the bottom of the settling tank 4 is dewatered by a sludge dewatering device 5.
In an alternative embodiment, the ultrasonic pipeline mixer 3 of the fracturing flow-back fluid treatment device provided by the embodiment of the present application comprises an ultrasonic generator and a static pipeline mixer. Wherein the ultrasonic generator is installed in a static pipeline mixer, and the static pipeline mixer is connected with the medicament filling system 8.
Illustratively, after the fracturing flow-back fluid enters the static pipeline mixer from the buffering device 2, the ultrasonic generator in the static pipeline mixer is started, and the agent is injected into the static pipeline mixer through the agent injection system 8. The agent is mixed with the fracturing flow-back fluid in the static mixer to generate chemical precipitation and chemical flocculation. Meanwhile, the ultrasonic wave pipeline mixer 3 sends out ultrasonic waves to inhibit equipment scaling caused by scaling substances and carries out sterilization treatment on the fracturing flow-back fluid.
In an alternative implementation manner, the lower portion of the settling tank 4 of the fracturing flow-back fluid treatment device provided in the embodiment of the present application is funnel-shaped, and the upper portion of the settling tank 4 is one of a rectangular parallelepiped, a cube, or a cylinder with an open top. Illustratively, the top of the settling tank 4 has a liquid discharge port 41, and the bottom of the settling tank 4 has a sludge outlet 42 connected to the sludge dewatering device 5. The middle part of the settling tank 4 is provided with a liquid inlet, the position of the liquid inlet is not lower than that of the settling inclined pipe 9, and the liquid inlet is connected with the ultrasonic pipeline mixer 3.
Illustratively, as shown in fig. 1, the embodiment of the frac flowback fluid treatment apparatus provided in the embodiment of the present application is as follows:
the device comprises an electrolytic tank 1, a buffer device 2, an ultrasonic wave pipeline mixer 3, a settling tank 4, a sludge dewatering device 5, an electrode plate 6, a variable-frequency direct-current adjustable-pole power supply 7, a medicament filling system 8 and a settling inclined tube 9.
Wherein, the electrolytic cell 1 is a cuboid structure, and the electrolytic cell 1 comprises an electrolytic cell water inlet 11, an electrolytic cell water outlet 12 and an electrode plate 6. Wherein, the water inlet 11 and the water outlet 12 of the electrolytic cell are distributed at two ends of a diagonal line of the electrolytic cell 1, and the position of the water inlet 11 of the electrolytic cell is lower than the position of the water outlet 12 of the electrolytic cell. The ultrasonic wave line mixer 3 includes an ultrasonic wave generator and a static line mixer, and the ultrasonic wave generator is installed in the static line mixer.
The electrode plate 6 comprises at least two flat-plate electrodes; at least two flat-shaped electrodes are vertically arranged in the electrolytic bath 1 in parallel, and the positive and negative poles of two adjacent flat-shaped electrodes are different. The lower part of the settling tank 4 is funnel-shaped, and the upper part of the settling tank 4 is a cuboid with an open top; the top of the funnel-shaped part of the settler 4 is fitted with a settler chute 9. The top of the settling tank 4 is provided with a liquid outlet 41, the bottom of the settling tank 4 is provided with a sludge outlet 42, and the sludge outlet 42 is connected with the sludge dewatering device 5. The middle part of the settling tank 4 is provided with a liquid inlet, the position of the liquid inlet is not lower than that of the settling inclined pipe 9, and the liquid inlet is connected with the ultrasonic pipeline mixer 3.
The electrolytic tank 1, the buffer device 2, the ultrasonic pipeline mixer 3 and the settling tank 4 are connected in sequence. At least two electrode plates 6 are vertically arranged in the electrolytic cell 1, and a variable-frequency direct-current adjustable-pole power supply 7 is connected with power interfaces of the electrode plates 6. The medicament filling system 8 is connected with the ultrasonic pipeline mixer 3. The settling inclined pipe 9 is positioned in the settling tank 4, and the position of the settling inclined pipe 9 is not higher than the liquid inlet of the settling tank 4. The sludge dewatering device 5 is positioned at the bottom of the settling tank 4.
The electrode of the electrode plate 6 is made of one or more of aluminum, iron, aluminum alloy, and steel. The sludge dewatering device 5 in the embodiment of the application is one of a screw stacking machine and a plate-and-frame filter press.
Pumping the fracturing flowback fluid to be treated into an electrolytic bath water inlet 11 at the bottom of the electrolytic bath 1, and then connecting a power supply of the electrode plate 6 in the electrolytic bath 1. The variable frequency direct current adjustable electrode power supply 7 provides variable frequency direct current to the electrode plate 6, so that an electric field is generated between the electrodes of the electrode plate 6. After the fracturing flowback fluid enters the electrolytic bath 1, electric flocculation is generated between the gaps of at least two flat electrodes in the electrode plate 6. The fracturing flow-back fluid after the electric flocculation treatment overflows from the water outlet 12 of the electrolytic cell 1 at the top to enter the buffer device 2, and flocs generated by the electric flocculation enter the subsequent buffer device 2 under the action of water flow from bottom to top and cannot settle at the bottom of the electrolytic cell 1. The variable-frequency direct-current adjustable-pole power supply 7 is used for exchanging the positive pole and the negative pole of two adjacent flat-plate-shaped electrodes in the electrode plate 6 according to the reference time. Because the positive and negative poles of two adjacent flat electrodes are exchanged, the direction of the electric field between the two adjacent flat electrodes is also correspondingly exchanged. The flocs and precipitates generated by the electric flocculation slow down the scaling rate of the flocs attached to the electrode plates under the action of the electric field which changes according to the reference time.
Illustratively, an electrochemical reaction occurs between electrodes energized by the electrode plate 6, for example, an oxidation reaction occurs after an anode (iron and aluminum anode plates) loses electrons to generate a strong oxidant and metal cations, the strong oxidant decomposes pollutants in water, and the formed metal cations are combined with hydroxide radicals in the fracturing flow-back fluid to generate a metal hydroxide colloid flocculant, and the hydroxide has high activity and strong adsorption capacity. The reduction reaction occurs after electrons are obtained on the cathode. The indirect reduction obtains the high valence or low valence metal cation of the electron at the cathode, so that the high valence or low valence metal cation is directly reduced into low valence cation or metal precipitate. Meanwhile, hydrogen and oxygen are respectively separated out from the cathode and the anode in the electrolysis process, so that tiny bubbles (commonly called electro-flotation) with extremely high dispersion degree are generated and combined with colloids, suspended matters, soluble pollutants, bacteria, viruses, heavy metals and the like in raw water to generate larger flocs.
After the fracturing flow-back fluid is buffered in the buffer tank of the buffer device 2 for flow fluctuation, the fracturing flow-back fluid is pumped into a static pipeline mixer of the ultrasonic pipeline mixer 3 by the buffer device 2. Starting an ultrasonic generator arranged in a static pipeline mixer, and utilizing the cavitation effect, the activation effect, the shearing effect and the preparation effect of ultrasonic waves to disperse, crush, loosen and loosen the originally contained scaling substances in the fracturing flowback fluid and the scaling substances generated after adding a medicament under the action of an ultrasonic field without easy scale adhesion, and meanwhile, the cavitation effect of the ultrasonic waves can also generate micro bubble nuclei to generate high temperature and high pressure to kill bacteria at the moment of adiabatic shrinkage and collapse, and can also crack water molecules into free radicals to oxidize organic matters in the fracturing flowback fluid to play a sterilization role. The chemical filling system 8 pumps a sodium carbonate solution and a polyacrylamide solution into the ultrasonic pipeline mixer 3. The sodium carbonate solution and the polyacrylamide solution are mixed with the fracturing flow-back fluid in the ultrasonic pipeline mixer 3, calcium ions, magnesium ions and other high-valence metal ions are precipitated under the action of the sodium carbonate solution, and flocs and precipitates are aggregated into clusters under the action of the polyacrylamide solution.
The fracturing flow-back fluid treated by the ultrasonic pipeline mixer 3 carries flocculated flocs and precipitates which are agglomerated into clusters to enter a settling tank 4. The fracturing flow-back fluid is settled in a settling tank 4. The conglomerated flocs and precipitates in the fracturing flow-back liquid are further settled in the settling inclined tube 9 to form large conglomerates, and the large conglomerates are compacted and settled at the bottom of the funnel-shaped part at the lower part of the settling tank 4; the separated clear liquid enters the cuboid part at the upper part of the settling tank 4 and overflows and is discharged from a liquid discharge port 41 at the top of the settling tank 4, and the clear liquid which can be reused or discharged after further advanced treatment is obtained. The sludge settled at the bottom of the settling tank 4 enters the sludge dewatering device 5 through the sludge outlet 42 at the bottom of the settling tank 4, and is subjected to reduction treatment after being dewatered by the sludge dewatering device 5. Illustratively, the sludge at the bottom of the settling tank 4 is subjected to a dewatering treatment by a stack screw machine.
According to the fracturing flow-back fluid treatment device provided by the embodiment of the application, the water inlet of the electrolytic cell is lower than the water outlet of the electrolytic cell, so that flocs and precipitates obtained by electric flocculation in the electrolytic cell are prevented from precipitating in the electrolytic cell; the positive and negative electrodes of the electrode plate are exchanged by using the variable-frequency adjustable-electrode power supply, so that the scaling rate of the electrode plate is reduced; buffering flow fluctuation through a buffer device; flocculating flocs and precipitates in the fracturing flow-back fluid into clusters through an ultrasonic pipeline mixer and a medicament filling system, and then feeding the clusters into a settling tank; further settling flocs and precipitates in the fracturing flow-back fluid through a settling inclined tube to obtain a treated clear solution; and (4) dehydrating the sludge at the bottom of the settling tank by using a sludge dehydrating device.
The embodiment of the application further provides a fracturing flow-back fluid treatment method which is applied to the fracturing flow-back fluid treatment device provided by the embodiment of the application and at least comprises the following steps 1 to 5.
Step 1, pumping the fracturing flow-back fluid to be treated into an electrolytic cell 1, switching on the current of a plate electrode 6 through a variable-frequency direct-current adjustable-pole power supply 7, and exchanging a positive electrode and a negative electrode of the plate electrode 6 according to reference time to perform electric flocculation treatment on the fracturing flow-back fluid.
And 2, the electrically flocculated fracturing flow-back fluid enters a buffer device 2 from the electrolytic bath 1, is buffered by the buffer device 2 and then enters an ultrasonic wave pipeline mixer 3.
And 3, starting the ultrasonic pipeline mixer 3, and pumping a medicament for chemical precipitation and chemical flocculation into the ultrasonic pipeline mixer 3 through the medicament filling system 8 to be mixed with the fracturing flow-back fluid entering the ultrasonic pipeline mixer 3. And carrying out chemical flocculation on the fracturing flow-back fluid under the action of a medicament. Under the action of ultrasonic waves, scaling substances are not easy to adhere to scale, and the fracturing flowback fluid is sterilized through the ultrasonic waves.
The agents used in the embodiments of the present application for chemical precipitation and chemical flocculation include at least chemical precipitants and organic flocculants. Wherein, the chemical precipitator is one or more of sodium carbonate, sodium hydroxide and potassium hydroxide; the organic flocculant comprises one or more of polyacrylamide and derivatives thereof. Illustratively, the molecular weight of the organic flocculant is from 200 to 2500 million.
And 4, settling the fracturing flow-back fluid treated by the ultrasonic pipeline mixer 3 in a settling tank 4. And further settling flocs and precipitates which are agglomerated in the fracturing flow-back fluid through a settling inclined tube 9 in the settling tank 4, and discharging separated clear liquid from the settling tank 4 to obtain treated clear liquid.
And 5, dehydrating the sludge settled at the bottom of the settling tank 4 by using a sludge dehydrating device 5.
Illustratively, the implementation manner of the method for treating the fracturing flow-back fluid provided by the embodiment of the present application is as follows:
pumping the fracturing flow-back fluid to be treated into an electrolytic tank water inlet 11 at the bottom of an electrolytic tank 1, switching on the current of a plate electrode 6 through a variable-frequency direct-current adjustable-pole power supply 7, adjusting the current to be 2.3 amperes (A), exchanging positive and negative electrodes of the plate electrode 6 according to adjustment reference time, and performing electric flocculation treatment on the fracturing flow-back fluid.
And step two, overflowing the electroflocculation fracturing flow-back fluid from the water outlet 12 of the electrolytic bath into the buffer device 2, and pumping the fracturing flow-back fluid into a static pipeline mixer of the ultrasonic pipeline mixer 3 by a pump of the buffer device 2 after the flow fluctuation is buffered in a buffer tank of the buffer device 2. The discharge capacity of the pump in the buffer device 2 and the discharge capacity of the water inlet 11 of the electrolytic bath are both 20 liters per hour (L/h).
And step three, starting an ultrasonic generator in the ultrasonic pipeline mixer 3, pumping a sodium carbonate solution and a polyacrylamide solution into the ultrasonic pipeline mixer 3 through the medicament filling system 8, and mixing the sodium carbonate solution and the polyacrylamide solution with the fracturing flow-back fluid pumped into the ultrasonic pipeline mixer 3. Calcium ions, magnesium ions, iron ions and other high-valence metal ions in the fracturing flowback fluid are precipitated under the action of a sodium carbonate solution, and flocs and precipitates are aggregated under the action of a polyacrylamide solution. Meanwhile, under the action of ultrasonic waves, the originally contained scaling substances in the fracturing flow-back fluid and the scaling substances generated after the medicament is added are not easy to adhere to scale, and the fracturing flow-back fluid is sterilized through the ultrasonic waves.
And step four, settling the fracturing flow-back fluid treated by the ultrasonic pipeline mixer 3 in a settling tank 4. And further settling flocs and precipitates which are agglomerated in the fracturing flow-back fluid through a settling inclined pipe 9 in the settling tank 4, and overflowing the separated clear liquid from a liquid outlet 41 of the settling tank 4 to obtain the treated clear liquid.
And step five, dehydrating the sludge settled at the bottom of the settling tank 4 by using a sludge dehydrating device 5, and then performing reduction treatment.
After the fracturing flow-back fluid is treated by the fracturing flow-back fluid treatment device and the method, the concentration of total suspended matters, the concentration of calcium ions, the concentration of magnesium ions and the concentration of iron ions in water are all remarkably reduced, and the sterilization rate reaches more than 99%. The water quality of the fracturing flow-back fluid before and after being treated by the steps is shown in table 1:
TABLE 1 quality of shale gas fracturing flowback fluid before and after treatment
In summary, the fracturing flow-back fluid treatment device provided by the embodiment of the application prevents flocs and precipitates obtained by electrocoagulation in the electrolytic cell from precipitating in the electrolytic cell through the condition that the water inlet of the electrolytic cell is lower than the water outlet of the electrolytic cell; the positive and negative electrodes of the electrode plate are exchanged by using the variable-frequency adjustable-electrode power supply, so that the scaling rate of the electrode plate is reduced; buffering flow fluctuation through a buffer device; flocculating flocs and precipitates in the fracturing flow-back fluid into a cluster through an ultrasonic pipeline mixer and a medicament filling system and then entering a settling tank; further settling flocs and precipitates in the fracturing flow-back fluid through a settling inclined tube to obtain a treated clear solution; and (4) dehydrating the sludge at the bottom of the settling tank by using a sludge dehydrating device. The fracturing flow-back fluid treatment device concentrates the settlement treatment of electric flocculation and chemical flocculation into a settling tank; the chemical precipitation, the chemical flocculation, the scale prevention and the sterilization are integrated into an ultrasonic pipeline mixer for synchronous operation; the flow of adjusting the pH value of the fracturing flow-back fluid is omitted by utilizing the ultrasonic pipeline mixer for anti-scaling treatment; the fracturing flow-back fluid treatment device shortens the treatment flow of the fracturing flow-back fluid and slows down the scaling rate of equipment; according to the fracturing flow-back fluid treatment method provided by the embodiment of the application, scaling of an electrolytic cell is slowed down by changing the anode and the cathode of an electrode plate; by combining the ultrasonic pipeline mixer and the medicament filling system, chemical precipitation, chemical flocculation, scale prevention and sterilization are synchronously performed, so that the treatment process is shortened; the separation efficiency of metal ions is enhanced by the combination of electro-flocculation and chemical flocculation.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described in detail herein.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The fracturing flow-back fluid treatment device is characterized by comprising an electrolytic tank (1), a buffer device (2), an ultrasonic pipeline mixer (3), a settling tank (4), a sludge dewatering device (5), an electrode plate (6), a variable-frequency direct-current adjustable-pole power supply (7), a medicament filling system (8) and a settling inclined tube (9);
the electrolytic tank (1), the buffer device (2), the ultrasonic pipeline mixer (3) and the settling tank (4) are sequentially connected, and the electrolytic tank (1) is used for enabling the fracturing flow-back fluid to be subjected to electric flocculation; the buffer device (2) is used for buffering flow fluctuation in the fracturing flow-back fluid treatment device;
the electrode plate (6) is arranged in the electrolytic cell (1), the variable-frequency direct-current adjustable-pole power supply (7) is connected with a power interface of the electrode plate (6), and the variable-frequency direct-current adjustable-pole power supply (7) is used for adjusting the current and automatically changing the positive pole and the negative pole of the electrode plate (6) according to reference time;
the ultrasonic pipeline mixer (3) is used for providing a place for chemical precipitation and chemical flocculation, inhibiting equipment scaling caused by scaling substances by adopting ultrasonic waves and sterilizing the fracturing flowback fluid; the medicament filling system (8) is connected with the ultrasonic pipeline mixer (3) and is used for filling medicaments for chemical precipitation and chemical flocculation into the ultrasonic pipeline mixer (3);
the settling inclined pipe (9) is positioned inside the settling tank (4), and the settling inclined pipe (9) is not higher than the liquid inlet of the settling tank (4);
the sludge dewatering device (5) is positioned at the bottom of the settling tank (4), and the settling tank (4) is used for separating flocs and clear liquid in the fracturing flow-back fluid; the sludge dewatering device (5) is used for dewatering and separating sludge at the bottom of the settling tank (4).
2. The frac flowback fluid treatment apparatus of claim 1, wherein the electrode plate (6) comprises at least two plate-like electrodes; the at least two flat-plate electrodes are vertically arranged in the electrolytic tank (1) in parallel; the positive and negative poles of two adjacent electrodes are opposite.
3. The fracturing flow-back fluid treatment device according to claim 1, wherein the electrolytic tank (1) is of a rectangular parallelepiped structure, and the electrolytic tank (1) comprises an electrolytic tank water inlet (11) and an electrolytic tank water outlet (12); the electrolytic tank water inlet (11) and the electrolytic tank water outlet (12) are distributed at two ends of a diagonal line of the electrolytic tank (1), and the position of the electrolytic tank water inlet (11) is lower than that of the electrolytic tank water outlet (12).
4. The frac flowback fluid treatment apparatus of claim 1, wherein the buffer apparatus (2) comprises a buffer tank and a pump; the water inlet of the buffer tank is arranged at the top of the buffer tank, and the water outlet of the buffer tank is arranged at the bottom of the buffer tank; the water inlet of the buffer tank is connected with the electrolytic cell (1) through a pipeline; the water outlet of the buffer tank is connected with the liquid suction end of the pump through a pipeline; the liquid discharge end of the pump is connected with the ultrasonic pipeline mixer (3).
5. The frac flowback fluid treatment apparatus of claim 1, wherein the top of the settling tank (4) has a fluid outlet (41); the bottom of the settling tank (4) is provided with a sludge outlet (42), and the sludge outlet (42) is connected with the sludge dewatering device (5); the middle part of the settling tank (4) is provided with a liquid inlet.
6. The fracturing flow-back fluid treatment device according to claim 1 or 5, wherein the lower part of the settling tank (4) is funnel-shaped, and the upper part of the settling tank (4) is one of a cuboid, a cube or a cylinder with an open top.
7. The device for treating the fracturing flow-back fluid as claimed in claim 1 or 2, wherein the electrode plate (6) is made of one or more of aluminum, iron, aluminum alloy and steel.
8. A method for treating a flowback fluid, which is applied to the apparatus according to any one of claims 1 to 7, the method comprising at least:
pumping the fracturing flow-back fluid to be treated into the electrolytic bath (1), switching on the current of the electrode plate (6) through the variable-frequency direct-current adjustable-pole power supply (7), and exchanging positive and negative electrodes of the electrode plate (6) according to reference time to perform electric flocculation treatment on the fracturing flow-back fluid;
the fracturing flow-back fluid after the electric flocculation enters the buffer device (2) from the electrolytic cell (1), and enters the ultrasonic wave pipeline mixer (3) after being buffered by the buffer device (2);
starting the ultrasonic pipeline mixer (3), and pumping the chemical for chemical precipitation and chemical flocculation into the ultrasonic pipeline mixer (3) through the chemical filling system (8) to be mixed with fracturing flowback fluid entering the ultrasonic pipeline mixer (3); carrying out chemical precipitation and chemical flocculation on the fracturing flow-back fluid under the action of the medicament; under the action of ultrasonic waves, scale forming substances are not easy to adhere to scale, and the fracturing flow-back fluid is sterilized through the ultrasonic waves;
the fracturing flow-back fluid treated by the ultrasonic pipeline mixer (3) is settled in the settling tank (4); further settling flocs and precipitates agglomerated in the fracturing flow-back fluid through the settling inclined tube (9) in the settling tank (4), and discharging separated clear liquid from the settling tank (4) to obtain treated clear liquid;
the sludge settled at the bottom of the settling tank (4) is dehydrated by the sludge dehydrating device (5).
9. The method of treating fracturing flow-back fluid of claim 8, wherein the agent for chemical precipitation and chemical flocculation pumped through the agent injection system (8) comprises a chemical precipitator comprising one or more of sodium carbonate, sodium hydroxide, potassium hydroxide.
10. The method of treating frac flowback fluid of claim 8 or 9, wherein the agent pumped through the agent injection system (8) for chemical precipitation and chemical flocculation further comprises an organic flocculant comprising one or more of polyacrylamide and derivatives thereof.
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