CN110981040A - Fracturing flow-back fluid treatment device and treatment method - Google Patents
Fracturing flow-back fluid treatment device and treatment method Download PDFInfo
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
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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
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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
- C02F1/72—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
- 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
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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Abstract
The invention provides a fracturing flow-back fluid treatment device which comprises an oxidation tank, a tubular electric flocculation reactor, a liquid storage tank, a pre-coated filter and a filtrate tank, wherein the oxidation tank is connected with the tubular electric flocculation reactor; the oxidation tank and the tubular electric flocculation reactor are connected with a liquid inlet pump through pipelines, the tubular electric flocculation reactor is communicated with a liquid storage tank through pipelines, the liquid storage tank is communicated with a pre-coating filter, and the pre-coating filter is directly or indirectly communicated with a filtrate tank through pipelines; wherein, the oxidation tank, the tubular electric flocculation reactor, the pre-coated filter and the filtrate tank are all fixed in a box body. The invention also provides a fracturing flow-back fluid treatment method, which adopts the fracturing flow-back fluid treatment device and comprises the following steps: s001: oxidizing the fracturing flow-back fluid by using hydrogen peroxide; s002: carrying out electrochemical reaction on the fracturing flow-back fluid to separate pollutants in the fracturing flow-back fluid to form flocs; s003: and introducing the fracturing flow-back liquid into a pre-film-coating filter to filter out flocs and impurities, and then introducing the fracturing flow-back liquid into a filtrate tank.
Description
Technical Field
The invention belongs to the technical field of clean production of reservoir transformation in the oil and gas industry, and particularly relates to a fracturing flow-back fluid treatment device and a treatment method.
Background
Fracturing modification is always the main technology of oil and gas field development, but how to treat and dispose a large amount of liquid returned after fracturing becomes a limiting factor of site construction. At present, the pretreatment technologies for removing color and suspended matters of fracturing flow-back fluid mainly comprise technologies such as precipitation, metal filter screen filtration, medium filter filtration, electric flocculation, chemical flocculation and the like, and the problems of deep color, large turbidity, high suspended matter content and the like of the liquid after the treatment of precipitation and metal filter screen filtration still exist; wherein, the medium filter is frequently backwashed and is not easy to be backwashed completely; multiple agents are added in the chemical flocculation treatment process, so that secondary pollution is easily caused; the liquid is relatively static in the operation process of the plate-type electric flocculation processor, the flow rate is slow, floc is adhered to the polar plate, the device is difficult to maintain and the like.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a fracturing flow-back fluid treatment apparatus and a treatment method, which overcome the above problems or at least partially solve or alleviate the above problems.
The fracturing flow-back fluid treatment device provided by the invention comprises an oxidation tank, a tubular electric flocculation reactor, a liquid storage tank, a pre-coated filter and a filtrate tank; a liquid inlet pump is connected between the outlet of the oxidation tank and the inlet of the tubular electric flocculation reactor through a pipeline, the outlet of the tubular electric flocculation reactor is connected with the inlet of the liquid storage tank through a pipeline, the outlet of the liquid storage tank is connected with the inlet of the pre-coating filter, and the outlet of the pre-coating filter is directly or indirectly connected with the inlet of the filtrate tank through a pipeline; wherein, the oxidation tank, the tubular electric flocculation reactor, the liquid storage tank, the pre-coated filter and the filtrate tank are all fixed in a box body.
The invention also has the following optional features.
Optionally, a window, an exhaust fan and an air conditioner are arranged on the box body.
Optionally, the tubular electroflocculation reactor comprises a plurality of monomer reactors connected in series and/or in parallel by liquid piping; each monomer reactor comprises a tube shell, an electrode rod and an electrode plate are arranged in the tube shell, the electrode rod is axially arranged in the tube shell, the electrode plate is cylindrical and surrounds the periphery of the electrode rod, and the front end and the rear end of the tube shell are respectively provided with a liquid inlet interface and a liquid outlet interface.
Optionally, the pre-coated membrane filter mainly comprises a reservoir, and an inlet of the reservoir is connected with an outlet of the reservoir through a pipeline; the filter drum is horizontally erected at an opening of the liquid storage tank, a rotating device is connected onto the filter drum, a gas-liquid outlet is formed in one end of a rotating shaft of the filter drum, the gas-liquid outlet is connected with an inlet of a gas-liquid separator, a scraper is arranged on the outer side of the filter drum, and a residue collecting tank is arranged below the scraper.
Optionally, an auxiliary agent tank is further connected between the inlet and the outlet of the liquid storage tank through a pipeline, and a liquid discharge pump is connected between the inlet of the auxiliary agent tank and the outlet of the liquid storage tank through a pipeline.
Optionally, a stirring device is arranged in the liquid storage tank.
Optionally, a spraying device is arranged in the filter drum, and an inlet of the spraying device is arranged on the end face of the filter drum.
Optionally, a gas-liquid separator and a negative pressure pump are further connected between the pre-membrane-coating filter and the filtrate tank through pipelines, an inlet is formed in the middle of the gas-liquid separator, a liquid outlet is formed in the bottom of the gas-liquid separator, and a gas outlet is formed in the upper portion of the gas-liquid separator, wherein a vacuum pump and a silencer are connected to the gas outlet of the gas-liquid separator, and the negative pressure pump and the filtrate tank are sequentially connected to the liquid outlet.
The invention also provides a fracturing flow-back fluid treatment method, which adopts the fracturing flow-back fluid treatment device and comprises the following steps:
s001: adding hydrogen peroxide into the oxidation tank, and carrying out oxidation treatment on the fracturing flow-back fluid;
s002: enabling the fracturing flow-back fluid subjected to oxidation treatment to pass through a tubular electric flocculation reactor, and carrying out electrochemical reaction on the fracturing flow-back fluid to separate pollutants in the fracturing flow-back fluid to form flocs;
s003: and (3) introducing the fracturing flow-back fluid which passes through the outlet pipe type electric flocculation reactor into a pre-film-coating filter, filtering out flocs and impurities, and then introducing into a filtrate tank.
Optionally, in S003, an auxiliary agent is introduced into a reservoir of the pre-membrane-coating filter, then the filter drum is started, so that after an auxiliary agent layer with a certain thickness is coated on the filter drum, the auxiliary agent in the reservoir is emptied, then the fracturing flow-back fluid is introduced into the reservoir, the fracturing flow-back fluid is filtered by the filter drum, the filtrate is introduced into the filtrate tank, and filter residues on the surface of the filter drum are scraped into the residue collecting tank by the scraper.
The fracturing flow-back fluid treatment device has the advantages that the tubular electric flocculation reactor can prevent flocs separated from fracturing flow-back fluid from being adhered to the electrode plate and the electrode bar, so that the flocs are easy to discharge, the fracturing flow-back fluid can be filtered by the pre-coated filter, filtered pollutants are scraped and separated, and solids are recovered, so that the environment is not polluted, the coated filter is easy to maintain and clean, and the whole treatment device is integrated in a box body and can be transported to various well sites by a truck for field work.
The method for treating the fracturing flow-back fluid can firstly carry out hydrogen peroxide oxidation treatment on the fracturing flow-back fluid, does not introduce new substances to cause secondary pollution, reduces the viscosity of the fracturing flow-back fluid, adopts a tubular electric flocculation reactor to carry out electric flocculation separation, adopts a pre-coated filter to filter the fracturing flow-back fluid, can scrape the surface layer of a pre-coated membrane according to the use condition of a filtering membrane, and ensures the filtering quality and efficiency.
Drawings
Fig. 1 is a schematic view of a connection structure of a fracturing flow-back fluid treatment device of the invention;
FIG. 2 is a schematic diagram of the structure of a unit reactor of the tubular electroflocculation reactor of FIG. 1;
FIG. 3 is a schematic diagram of the pre-membrane filter of FIG. 1.
In the above figures: 1, an oxidation tank; 2 tubular electric flocculation reactor; 210 a monomer reactor; 211 a tube shell; 212 an electrode rod; 213 an electrode plate; 214 a fluid inlet interface; 215 liquid outlet interface; 3, a liquid storage tank; 4 pre-coating a membrane filter; 401 liquid storage tank; 402 a filter drum; 403 a rotating device; 404 gas-liquid outlet; 405 a squeegee; 406 a residue collection tank; 407 a stirring device; 408 a spray device; 5, a filtrate tank; 6, a negative pressure pump; 7 liquid inlet pump; 8, an auxiliary agent tank; 9 a liquid discharge pump; 10 gas-liquid separator; 11 a vacuum pump; 12 a silencer.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
Example 1
Referring to fig. 1, an embodiment of the present invention provides a fracturing flow-back fluid treatment apparatus, including an oxidation tank 1, a tubular electrocoagulation reactor 2, a liquid storage tank 3, a pre-membrane filter 4, a filtrate tank 5, and a box body; a liquid inlet pump 7 is connected between the outlet of the oxidation tank 1 and the inlet of the tubular electric flocculation reactor 2 through a pipeline, the outlet of the tubular electric flocculation reactor 2 is connected with the inlet of the liquid storage tank 3 through a pipeline, the outlet of the liquid storage tank 3 is connected with the inlet of the pre-coating filter 4, and the outlet of the pre-coating filter 4 is directly or indirectly connected with the inlet of the filtrate tank 5 through a pipeline; wherein, the oxidation tank 1, the tubular electric flocculation reactor 2, the pre-coated filter 4 and the filtrate tank 5 are all fixed in the box body.
The fracturing flow-back fluid pumped out from the oil well is oxidized in an oxidation tank 1 and then is introduced into a tubular electric flocculation reactor 2 for electric flocculation reaction, the pollutants are flocculated and then are introduced into a liquid storage tank 3, after a certain amount of pollutants are accumulated, the pollutants are introduced into a pre-film-coated filter 4 for filtration, the flocculated pollutants are separated and collected and treated in a centralized manner, and the filtered fracturing flow-back fluid is introduced into a filtrate tank 5. Because the oxidation tank 1, the tubular electric flocculation reactor 2, the pre-film-coating filter 4 and the filtrate tank 5 are all arranged and fixed in the box body, the fracturing flow-back fluid can be transported to various well sites for field work by loading the box body by a truck.
Example 2
On the basis of embodiment 1, a window, an exhaust fan and an air conditioner are arranged on the box body.
The operation condition of equipment in the box can be checked through the window, the waste gas released by the equipment in the box can be exhausted through the exhaust fan, the ambient temperature in the box can be adjusted through the air conditioner, and the equipment can normally operate.
Example 3
Referring to fig. 2, on the basis of example 1, the tubular electroflocculation reactor 2 includes a plurality of monomer reactors 210, the plurality of monomer reactors 210 being connected in series and/or in parallel by liquid piping; each monomer reactor 210 comprises a tube shell 211, an electrode rod 212 and an electrode plate 213 are arranged in the tube shell 211, the electrode rod 212 is axially arranged in the tube shell 211, the electrode plate 213 is cylindrical and surrounds the periphery of the electrode rod 212, and the front end and the rear end of the tube shell 211 are respectively provided with a liquid inlet interface 214 and a liquid outlet interface 215.
The tubular electroflocculation reactor 2 is composed of nine monomer reactors 210, and the liquid inlet 214 and the liquid outlet 215 of the first three monomer reactors 210 connected in parallel are connected in parallel, wherein the liquid outlet 215 is connected in series with the liquid inlet of the other monomer reactors 210. Each monomer reactor comprises a tube shell 211, an electrode rod 212 and a cylindrical electrode plate 213 are arranged in each tube shell 211, an annular channel is formed between the electrode rod 212 and the electrode plate 213, flocs basically do not adhere to the cylindrical electrode plate 213 and the electrode rod 212 under the action of water flow, and each monomer reactor can realize independent power-on control on a control cabinet, so that the maintenance and the replacement of a single monomer reactor are facilitated.
Example 4
Referring to fig. 3, on the basis of embodiment 1, the pre-filming filter 4 mainly comprises a liquid storage tank 401, wherein an inlet of the liquid storage tank 401 is connected with an outlet of the liquid storage tank 3 through a pipeline; a filter drum 402 is horizontally erected at an opening of the reservoir 401, a rotating device 403 is connected to the filter drum 402, a gas-liquid outlet 404 is arranged at one end of a rotating shaft of the filter drum 402, the gas-liquid outlet 404 is connected with an inlet of the gas-liquid separator 10, a scraper 405 is arranged outside the filter drum 402, and a residue collecting tank 406 is arranged below the scraper 405.
The peripheral surface of the filter drum 402 of the pre-coating filter 4 is provided with filter holes, the surface of the filter drum extends into the reservoir tank 401, when the reservoir tank 401 of the pre-coating filter 4 receives fracturing flow-back fluid after undergoing an electrocoagulation reaction in the tubular electrocoagulation reactor 2, the fracturing flow-back fluid contacts the peripheral surface of the filter drum 402, the vacuum pump 8 is started, the vacuum pump 8 pumps air in the filter drum 402 from the gas-liquid outlet 404, so that the wastewater in the reservoir tank 401 is sucked into the filter drum 402, the filter drum 402 rotates under the driving of the rotating device 403, wherein the flocculated fluid is uniformly adsorbed on the peripheral surface of the filter drum 402 after being filtered, and falls into the residue collecting tank 406 below the scraper 405 after being scraped by the scraper 405, and the fracturing flow-back fluid flowing into the gas-liquid separator after being filtered is pumped into the filtrate tank 5 by the negative pressure pump 6.
Example 5
Referring to fig. 1, in example 4, an auxiliary agent tank 8 is further connected between the inlet and the outlet of the reservoir 401 through a pipeline, and a drain pump 9 is connected between the inlet of the auxiliary agent tank 8 and the outlet of the reservoir 401 through a pipeline.
The auxiliary agent is prepared in the auxiliary agent tank 8, the auxiliary agent is diatomite solution or cellulose solution, before the fracturing flow-back fluid is introduced into the reservoir 401, the auxiliary agent in the auxiliary agent tank 8 is introduced into the reservoir 401, then the vacuum pump 8 and the rotating device 403 of the filter drum 402 are started to coat diatomite or cellulose with a certain thickness on the circumferential surface of the filter drum 402, then the redundant auxiliary agent is recovered to the auxiliary agent tank 8, then the communication between the auxiliary agent tank 8 and the reservoir 401 is closed, after the fracturing flow-back fluid is introduced into the reservoir 401, the fracturing flow-back fluid can be finely filtered through an auxiliary agent layer formed by the diatomite or the cellulose on the circumferential surface of the filter drum 402, when the filtering speed is reduced a lot, the surface layer of the auxiliary agent layer is scraped off by the scraper 405, until the thickness of the auxiliary agent layer is scraped to a certain degree, the auxiliary agent tank 8 and the reservoir 401 are communicated again, and the circumferential surface of the filter drum 402 is coated with the, the maintenance is simple and convenient, and the fine filtration of the fracturing flow-back fluid can be ensured.
Example 6
Referring to fig. 3, in the embodiment 4, an agitating device 407 is provided in the reservoir 401.
After the auxiliary agent solution is introduced into the reservoir 401, in order to avoid precipitation, a stirring device 407 needs to be arranged in the reservoir 401, wherein the stirring device 407 is of a fan-shaped frame structure and can swing back and forth in the space between the filter drum 402 and the reservoir 401.
Example 7
Referring to fig. 3, in example 1, a shower device 408 is provided in the filter drum 402, and an inlet of the shower device 408 is provided on an end surface of the filter drum 402.
The spraying device 408 is disposed in the filter drum 402, the spraying device 408 extends axially from both ends of the filter drum 402, and a cleaning liquid is introduced into the spraying device 408 to reversely wash the filter drum 402, so that the auxiliary agent or the filtered material attached to the surface of the filter drum 402 is cleaned.
Example 8
Referring to fig. 1, on the basis of embodiment 1, a gas-liquid separator 10 and a negative pressure pump 6 are further connected between the pre-filming filter 4 and the filtrate tank 5 through a pipeline, an inlet is arranged at the middle part of the gas-liquid separator 10, a liquid outlet is arranged at the bottom part, a gas outlet is arranged at the upper part, a vacuum pump 11 and a silencer 12 are connected to the gas outlet of the gas-liquid separator, the negative pressure pump 6 is connected to the liquid outlet, and the filtrate tank 5 is connected to the outlet of the negative pressure pump 6.
The fracturing flow-back fluid filtered by the pre-coating filter 4 passes through the gas-liquid separator 10 to separate out dissolved gas, is pumped out by the vacuum pump 11, keeps the negative pressure state of the filter drum 402, and is connected with the outlet of the vacuum pump 11 by the silencer 12 to eliminate noise; after the liquid level in the gas-liquid separator 10 reaches a certain height, the liquid level detector is linked with the negative pressure pump 6 to transfer the liquid in the gas-liquid separator 10 to the filtrate tank 5, so that the liquid level of the gas-liquid separator 10 is lower than the liquid inlet of the gas-liquid separator 10, and the filter rotary drum 402 and the gas-liquid separator 10 are kept in a negative pressure state.
Example 9
The embodiment of the invention provides a fracturing flow-back fluid treatment method, which adopts the fracturing flow-back fluid treatment device in any one of the embodiments and comprises the following steps: s001: adding hydrogen peroxide with the concentration of 0.5 to 1 percent into the oxidation tank 1, and carrying out oxidation treatment on the fracturing flow-back fluid; s002: enabling the fracturing flow-back fluid subjected to oxidation treatment to pass through a tubular electric flocculation reactor 2, and carrying out electrochemical reaction on the fracturing flow-back fluid to separate pollutants in the fracturing flow-back fluid to form flocs; s003: and (3) introducing the fracturing flow-back liquid which passes through the outlet pipe type electric flocculation reactor 2 into a pre-coated filter 4, filtering out flocs and impurities, and then introducing into a filtrate tank 5.
In the step S001, the fracturing flow-back fluid is oxidized by hydrogen peroxide, so that no new substance is introduced to cause secondary pollution, and residual organic matter macromolecules in the flow-back fluid are subjected to chain scission to reduce the viscosity of the flow-back fluid, thereby being beneficial to the electrocoagulation reaction in the next step; in step S002, after the oxidized fracturing flow-back fluid enters the tubular electrocoagulation reactor 2, flocculation, air flotation, oxidation and reduction are achieved in the monomer reactor 210 after the electrochemical reaction of the positive and negative electrodes, so that the organic matter, colloid and solid suspended matter in the fracturing flow-back fluid are aggregated, settled and destabilized to form flocs; in step S003, the fracturing flow-back fluid enters the reservoir 401 of the pre-filming filter 4, and is sucked by the filter drum 402 under the action of the vacuum pump 11, so that contaminants such as flocs are trapped on the peripheral surface of the filter drum 402, and the clear liquid enters the filtrate tank 5 under the suction of the negative pressure pump, and can be reused on site.
In specific implementation, the fracturing flow-back fluid of a certain gas field is dark brown, has the viscosity of 1.59mpa.s, the pH value of 6-7, the color of 2387, the turbidity of 899NTU and the suspended substance of 4085 mg/L. Adding 1% hydrogen peroxide into an oxidation tank 1 for oxidation, removing black after 2-3min, leading fracturing flow-back fluid to be light yellow, leading the fracturing flow-back fluid to enter a tubular electric flocculation reactor 2 through a liquid inlet pump 7, flocculating pollutants in the fracturing flow-back fluid through electrochemical reaction, leading the pollutants to enter a liquid storage tank along with clear liquid, and then leading the pollutants to flow into a liquid storage tank 401 of a pre-coated membrane filter 4. The flocs are retained by the aid precoated filter drum 402, the clear liquid enters the filtrate tank 5, and the flocs and the scraped-off aid are transferred to the residue collection tank 406. Clear liquid is obtained after treatment, the appearance is clear, and the chroma, turbidity and suspended matter removal rate reach 98%.
Example 10
In S003, an auxiliary agent is introduced into the reservoir 401 of the pre-filming filter 4, the filtering drum 402 is then started to coat an auxiliary agent layer of a certain thickness on the filtering drum 402, the auxiliary agent in the reservoir 401 is emptied, the fracturing flow-back fluid is introduced into the reservoir 401, the fracturing flow-back fluid is filtered by the filtering drum 402, the filtrate is introduced into the filtrate tank 5, and the residue on the surface of the filtering drum 402 is scraped into the residue collecting tank 406 by the scraper 405.
When the filter drum 402 is started, the vacuum pump 11 vacuumizes from the gas outlet of the gas-liquid separator 10 to form negative pressure in the filter drum 402, the filter drum 402 is driven by the rotating device 403 to rotate, the auxiliary agent is intercepted on the circumferential surface of the filter drum 402 when the auxiliary agent solution is sucked in by the filter holes on the circumferential surface of the filter drum 402, the auxiliary agent is composed of diatomite or fibers to form a finer filter layer, the thickness of the filter layer can be controlled by adjusting the scraper 405, and the outlet of the vacuum pump 11 is connected with the silencer 12 to eliminate noise; when the filtering layer on the circumferential surface of the filtering rotary drum 402 reaches the required thickness, the additive solution in the reservoir 401 is recovered into the additive tank 8 through the liquid discharge pump 9, the fracturing flow-back liquid is introduced into the reservoir 401, the rotating speed of the filtering rotary drum 402 and the footage of the scraper 405 are adjusted, and then the fracturing flow-back liquid can be filtered through the filtering rotary drum 402.
In specific implementation, the fracturing flow-back fluid of a certain gas field is black, the viscosity is 1.38mpa.s, the pH is 6-7, the chroma is 2500, the turbidity is 318NTU, and the suspended matter 3895 mg/L. The precoating filter 4 is precoated with an auxiliary agent layer 30mm in advance, a scraper 405 is set to scrape the footage for manual adjustment, the footage of the scraper is 0.1mm after the filtration speed is reduced, fracturing flow-back fluid enters the precoating filter 4 from the liquid storage tank 3, and clear liquid is obtained after filtration, the appearance is clear, the chroma is 89, the turbidity is 11NTU, and the suspended matter is 54 mg/L.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (10)
1. The fracturing flow-back fluid treatment device is characterized by comprising an oxidation tank (1), a tubular electric flocculation reactor (2), a liquid storage tank (3), a pre-coated filter (4), a filtrate tank (5) and a box body; a liquid inlet pump (7) is connected between the outlet of the oxidation tank (1) and the inlet of the tubular electric flocculation reactor (2) through a pipeline, the outlet of the tubular electric flocculation reactor (2) is connected with the inlet of the liquid storage tank (3) through a pipeline, the outlet of the liquid storage tank (3) is connected with the inlet of the pre-film-coating filter (4), and the outlet of the pre-film-coating filter (4) is directly or indirectly connected with the inlet of the filtrate tank (5) through a pipeline; wherein the oxidation tank (1), the tubular electric flocculation reactor (2), the pre-coated membrane filter (4) and the filtrate tank (5) are all fixed in the box body.
2. The apparatus of claim 1, wherein the housing is provided with a window, an exhaust fan, and an air conditioner.
3. The frac flowback fluid treatment apparatus of claim 1, wherein the tubular electroflocculation reactor (2) comprises a plurality of monomer reactors (210), the plurality of monomer reactors (210) being connected in series and/or in parallel by liquid piping; each monomer reactor (210) comprises a tube shell (211), an electrode rod (212) and an electrode plate (213) are arranged in the tube shell (211), the electrode rod (212) is axially arranged in the tube shell (211), the electrode plate (213) is cylindrical and surrounds the periphery of the electrode rod (212), and a liquid inlet interface (214) and a liquid outlet interface (215) are respectively arranged at the front end and the rear end of the tube shell (211).
4. The fracturing flow-back fluid treatment device according to claim 1, wherein the precoated membrane filter (4) comprises a reservoir (401), and an inlet of the reservoir (401) is connected with an outlet of the reservoir (3) through a pipeline; the filter drum (402) is horizontally erected at an opening of the reservoir (401), a rotating device (403) is connected onto the filter drum (402), a gas-liquid outlet (404) is formed in one end of a rotating shaft of the filter drum (402), the gas-liquid outlet (404) is connected with an inlet of a gas-liquid separator (10), a scraper (405) is arranged on the outer side of the filter drum (402), and a residue collecting tank (406) is arranged below the scraper (405).
5. The fracturing fluid anti-drainage treatment device according to claim 4, characterized in that an auxiliary tank (8) is connected between the inlet and the outlet of the liquid storage tank (401) through a pipeline, and a fluid drainage pump (9) is connected between the inlet of the auxiliary tank (8) and the outlet of the liquid storage tank (401) through a pipeline.
6. The frac flowback fluid treatment apparatus of claim 5, wherein an agitation device (407) is disposed within the reservoir (401).
7. The frac flowback fluid treatment apparatus of claim 4, wherein a spray device (408) is disposed within the filter drum (402), and an inlet of the spray device (408) is disposed on an end face of the filter drum (402).
8. The fracturing flow-back fluid treatment device according to claim 1, wherein a gas-liquid separator (10) and a negative pressure pump (6) are further connected between the pre-coated membrane filter (4) and the filtrate tank (5) through a pipeline, an inlet is arranged in the middle of the gas-liquid separator (10), a fluid outlet is arranged at the bottom of the gas-liquid separator, a gas outlet is arranged at the upper part of the gas-liquid separator, wherein a vacuum pump (11) and a silencer (12) are connected to the gas outlet of the gas-liquid separator (10), and the negative pressure pump (6) and the filtrate tank (5) are sequentially connected to the fluid outlet.
9. A method for treating a flowback fluid by using the apparatus according to any one of claims 1 to 8, comprising the steps of:
s001: adding hydrogen peroxide into the oxidation tank, and carrying out oxidation treatment on the fracturing flow-back fluid;
s002: enabling the fracturing flow-back fluid subjected to oxidation treatment to pass through a tubular electric flocculation reactor, and carrying out electrochemical reaction on the fracturing flow-back fluid to separate pollutants in the fracturing flow-back fluid to form flocs;
s003: and (3) introducing the fracturing flow-back fluid which passes through the outlet pipe type electric flocculation reactor into a pre-film-coating filter, filtering out flocs and impurities, and then introducing into a filtrate tank.
10. The method for treating fracturing flow-back fluid according to claim 9, wherein in S003, an auxiliary agent is introduced into a reservoir of the pre-membrane-coated filter, then the filter drum is started to coat an auxiliary agent layer with a certain thickness on the filter drum, the auxiliary agent in the reservoir is emptied, then the fracturing flow-back fluid is introduced into the reservoir, the fracturing flow-back fluid is filtered by the filter drum, the filtrate is introduced into a filtrate tank, and filter residues on the surface of the filter drum are scraped into a residue collecting tank by using a scraper.
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| CN115738490A (en) * | 2021-10-25 | 2023-03-07 | 中国石油天然气集团有限公司 | Recycling method of waste diatomite after filtering fracturing flow-back fluid |
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Effective date of registration: 20201030 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. Address before: 710018 Shaanxi province Xi'an Weiyang Changqing Changqing prosperous Park District Building Room 1203 Applicant before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co. Applicant before: CHINA NATIONAL PETROLEUM Corp. Applicant before: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. |
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