CN113845257A - Device and method for recycling and treating drilling and completion waste liquid by ultrasonic technology - Google Patents
Device and method for recycling and treating drilling and completion waste liquid by ultrasonic technology Download PDFInfo
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- 238000005516 engineering process Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004064 recycling Methods 0.000 title claims abstract description 20
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
- C02F1/325—Irradiation devices or lamp constructions
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention provides a device and a method for recycling and treating drilling and completion waste liquid by using an ultrasonic technology, which comprises a shell and is characterized in that an inclined baffle is arranged in the shell, the inclined baffle divides the shell into a cavitation air flotation zone and a photocatalytic oxidation zone, a slag scraping plate, a slag discharging groove and a slag discharging pipe are arranged at the top of the shell, and an inclined plate filter and a water outlet pipe are arranged at the lower part of the photocatalytic oxidation zone. And a photocatalytic clapboard and an ultraviolet lamp light tube are arranged in the photocatalytic oxidation zone. The invention has the advantages that the hydrodynamic cavitation device and the ultrasonic cavitation device are integrated, and the problem of unstable tiny bubbles generated by the air floatation device is solved. The treatment equipment combines hydrodynamic cavitation, ultrasonic wave, ozone catalysis and photocatalysis technologies, promotes ozone to be rapidly decomposed to generate more oxidation free radicals, improves the degradation rate of organic matters, reduces the ozone adding amount, reduces the waste liquid treatment operation cost, optimizes the treatment process program, and has important significance for building ecological oil fields.
Description
Technical Field
The invention belongs to the technical field of waste liquid treatment of oil and gas fields, and particularly relates to a device and a method for recycling waste liquid from well drilling and completion by using an ultrasonic technology.
Background
The petroleum and natural gas is used as an important energy source and strategic resource, and plays a vital role in the rapid development of the economy in China. In recent years, with the increasing exploitation of petroleum and natural gas, the environmental problems in the exploitation process are more and more emphasized. With the increasing demand of petroleum and the development of drilling technology, the number and depth of drilled wells are increasing, and in order to meet the technical requirements for complex geological conditions and well drilling and completion engineering, the types of well drilling and completion fluids are increasing, and additives are increasing, so that the compositions of the well drilling and completion fluids are extremely complex. Drilling and completion waste liquid is an important pollutant generated in the well site exploitation process of oil and gas fields. The main sources of drilling and completion waste liquid are liquid phase in drilling waste, waste drilling fluid, sewage and rainwater around a well site and the like.
The waste drilling and completion fluid has the characteristics of high suspended matter, high oil content and containing a certain amount of toxic organic and inorganic pollutants. Heavy metals in the drilling waste liquid are easy to accumulate in the environment, and threaten the life safety of human beings and organisms. Meanwhile, the high salt content can reduce the water absorption capacity of the plants in the soil and influence the growth of the plants. Therefore, after the completion operation is completed, the completion waste liquid is recycled.
The drilling and completion waste liquid has the characteristic of complex components, so that the harmless treatment difficulty of the drilling and completion waste liquid is greatly improved. The drilling fluid is generally colloid, and the current effective treatment method for the drilling fluid is a chemical gel breaking method, namely, chemical agents such as a demulsifier, a flocculating agent and the like are added into the waste drilling fluid, so that the stability of a system is damaged, oil in the waste drilling fluid is gathered and separated out, and the drilling fluid is harmless, but the drilling fluid treated by the chemical agents cannot be utilized any more. Other treatment means, such as landfill method, solidification method, etc., can not achieve the purpose of recycling the treated water quality liquid, which causes pollution and waste of a large amount of drilling and completion waste liquid. Therefore, the ultrasonic technology is proposed to treat the drilling and completion waste liquid, and the cavitation of the ultrasonic is utilized to generate oxidation free radicals to oxidize and degrade organic matters in the drilling and completion waste liquid.
The power ultrasound refers to the ultrasound with the ultrasonic frequency of 20 kHz-100 kHz, and a series of physiological and biochemical effects can be generated when the power ultrasound acts on water. Ultrasonic waves are a special energy form, and the unique effects mainly comprise mechanical action, cavitation effect, thermal effect, chemical effect and the like. The main effect of the ultrasonic treatment of the waste liquid from well drilling and completion is cavitation, and the basic principle is that micro bubbles existing in the liquid vibrate under the action of a sound field, when the sound pressure reaches a certain value, the bubbles rapidly expand and then close, and when the bubbles close, shock waves are generated, and finally collapse. The cavitation forms high temperature up to 5000K and pressure up to 50MPa, so that water vapor is subjected to split and chain reaction to generate OH, and OH is subjected to oxidation reaction with organic matters difficult to volatilize and is degraded into water and micromolecular substances.
Meanwhile, suspended matters in the drilling and completion waste liquid are treated by adopting an air floatation technology, wherein the air is blown into the drilling and completion waste liquid by the air floatation technology, so that micro bubbles are generated in the drilling and completion waste liquid, the bubbles can float upwards under the action of gravity, and grease and suspended particles in the drilling and completion waste liquid can be attached to the surfaces of the bubbles, so that the aim of removing the suspended matters is fulfilled. The cavitation of the ultrasonic wave can generate a large amount of micro bubbles, and the air floatation efficiency is accelerated.
The photocatalysis method is a method which has low cost, environmental protection and mild reaction condition and can effectively remove pollutants in the waste liquid of the well drilling and completion. The degradation mechanism is as follows: the photocatalysis material generates electrons and holes under the excitation of light, then the holes are combined with hydroxyl to generate hydroxyl radicals, the electrons are combined with oxygen to generate superoxide radicals, and the two radicals have strong oxidizability and can oxidize organic pollutants adsorbed on the surface of the photocatalysis material into carbon dioxide, water and other inorganic micromolecules, thereby achieving the purpose of purifying wastewater.
However, the existing ultrasonic air flotation device also has the problems of too low bubble generation rate, large bubbles and unobvious demulsification and separation effects; and the harmless treatment of the drilling and completion waste liquid has the defects of complex process, wide equipment floor area, high energy consumption, high maintenance frequency and the like.
Disclosure of Invention
The invention aims to provide a device and a method for recycling and treating drilling and completion waste liquid by using an ultrasonic technology according to the defects of the prior art. The treatment equipment has the advantages of simple structure, convenient use and operation, no pollution, high energy utilization rate and obvious Chemical Oxygen Demand (COD) and grease removal effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an ultrasonic technology bores completion waste liquid cyclic utilization processing apparatus and method, includes the casing, its characterized in that be equipped with oblique baffle in the casing, oblique baffle separates the casing for cavitation air supporting district and photocatalytic oxidation district, cavitation air supporting district and photocatalytic oxidation district pass through upper portion intercommunication, cavitation air supporting district lower part is equipped with mud district, mud pipe, cavitation air supporting district lateral part and water piping connection, the inlet tube is equipped with ozone air inlet, hydrodynamic cavitation device, the inside ultrasonic transducer that is equipped with of cavitation air supporting district, the casing top is equipped with scum board, slag groove, slag pipe, photocatalytic oxidation district lower part is equipped with swash plate filter, outlet pipe. And a photocatalytic clapboard and an ultraviolet lamp light tube are arranged in the photocatalytic oxidation zone.
Preferably, the casing is cylindrical, and the material is the carbon steel, vertical installation, has stronger mobility, area is less.
Preferably, the hydrodynamic cavitation device is a venturi tube, and the length of the inlet section and the outlet section of the venturi tube is 20 cm; the length of the contraction section is 20 mm; the throat part is 1mm in length and 1mm in diameter; the length of the diffusion section is 70 mm; the contraction angle alpha is 15 degrees; the diffusion angle θ is 7 °.
Preferably, the inclined baffle has an inclination angle of 60-80 degrees, so that the drilling and completion waste liquid can form a rotational flow, and the polymerization of micro bubbles and grease is promoted.
Preferably, the ultrasonic transducer is connected with an ultrasonic generator outside the shell through an ultrasonic terminal.
Preferably, the ultrasonic transducers are fixed in an annular arrangement and in parallel in the axial direction, and 8 ultrasonic transducers are uniformly arranged along the circumference.
Preferably, the ultrasonic frequency of the ultrasonic transducer is 20-60 kHz, and the ultrasonic power is 150-300W.
Preferably, the slag scraping plate is driven to rotate by a slag scraping motor, the slag discharging groove is used for collecting scum generated by rotation of the slag scraping plate and discharging the scum outwards through a slag discharging pipe, the slag scraping plate is made of carbon steel, the slag scraping speed is 0.02m/s, and the power of the slag scraping motor is 0.75-2.5 kw.
Preferably, the photocatalytic oxidation region comprises at least one photocatalytic clapboard axially fixed in parallel to the housing, the photocatalytic clapboard comprises a substrate and photocatalytic layers arranged on the surfaces of two sides of the substrate, a flow channel is formed between adjacent photocatalytic clapboards, an ultraviolet lamp tube is arranged between adjacent photocatalytic clapboards, the power of the ultraviolet lamp tube is 150-200W, and the drilling and completion waste liquid passes through ozone and photocatalytic oxidant TiO2After the co-treatment, the organic pollutants adsorbed on the surface of the photocatalytic barrier 16 are oxidized into inorganic small molecules such as carbon dioxide and water.
Preferably, the device and the method for recycling the drilling and completion waste liquid by the ultrasonic technology are characterized by comprising the following steps:
step 1), the drilling and completion waste liquid enters a hydrodynamic cavitation device from a water inlet pipe, ozone is blown into an ozone inlet at the same time, and the ozone and the drilling and completion waste liquid are mixed in the water inlet pipe and then enter a cavitation air flotation zone.
And 2) after the drilling and completion waste liquid is filled in the cavitation air floatation area, turning on an ultrasonic power supply, generating a high-power pulse electric signal by using an ultrasonic generator, transmitting the high-power pulse electric signal to an ultrasonic transducer through an ultrasonic terminal, converting an electroacoustic signal by using the transducer, generating high-power ultrasonic waves to act on the drilling and completion waste liquid to generate cavitation, floating micro bubbles generated by the cavitation, blown ozone bubbles, suspended particles and grease attached to the surfaces of the bubbles under the action of gravity, and simultaneously settling sludge in the drilling and completion waste liquid under the action of gravity.
And 3) after the suspended particles and the grease are supported on the water surface by the micro bubbles, turning on a slag scraping motor, driving a slag scraping plate to rotate by the slag scraping motor, scraping the suspended particles and the grease on the water surface into a slag discharging groove for storage, and discharging pollutants through a slag discharging pipe after the slag discharging groove is filled.
And 4) subsequently, the drilling and completion waste liquid enters a photocatalytic oxidation area, an ultraviolet light tube is opened, the drilling and completion waste liquid sequentially flows through each overflow groove under the action of gravity, organic pollutants are adsorbed on a photocatalytic partition plate, and the organic pollutants in the drilling and completion waste liquid are oxidized into water and carbon dioxide under the action of photocatalytic oxidation.
And 5) the drilling and completion waste liquid after photocatalytic oxidation still contains a small amount of rock debris, the rock debris is effectively intercepted by the inclined plate filter, and the drilling and completion waste liquid after treatment meets the requirement of recycling and is discharged through the water outlet pipe.
The working principle of the invention is as follows: the hydrodynamic cavitation device and the ultrasonic device are used for generating micro-bubbles, and the micro-bubbles adsorb suspended particles and grease on the surface to form scum, and the scum is removed through a scum board. Meanwhile, the inclined baffle enables the drilling and completion waste liquid to generate rotational flow, sludge is precipitated under the action of gravity, and micro bubbles are promoted to float upwards. Meanwhile, ozone is introduced into the well drilling and completion waste liquid to remove the polluted organic matters in the well drilling and completion waste liquid under the coupling action of ultrasonic waves and a photocatalyst, so that the COD value in the well drilling and completion waste liquid is reduced.
The invention has the following advantages: (1) is scientific and efficient. The hydraulic cavitation device and the ultrasonic device can simultaneously generate a large number of micro bubbles with small diameter, high air floatation efficiency and strong controllability. Meanwhile, the cavitation generated by the ultrasonic wave can improve the efficiency of oxidizing the organic matters in the drilling and completion waste liquid by ozone, and greatly reduce the COD value in the drilling and completion waste liquid by combining the photocatalytic oxidation. (2) Is economical and environment-friendly. Ozone introduced into the treatment equipment can generate micro bubbles for air floatation treatment, and can also be coupled with ultrasonic waves and ultraviolet light to oxidize pollutants in the drilling and completion waste liquid, so that the ozone utilization rate is improved, and the ozone cost is reduced. (3) Simple process and small occupied area. As a mature technology in sewage treatment, the air flotation technology and the advanced oxidation technology can be applied to the treatment of drilling and completion waste liquid. Secondly, the three technologies can be coupled according to the principles of different technologies, the designed integrated treatment equipment can treat the drilling and completion waste liquid with high efficiency and low energy, and the treatment equipment has simple process and small occupied area.
Description of the drawings:
FIG. 1 is a schematic diagram of an apparatus for recycling drilling and completion waste liquid by using ultrasonic technology
FIG. 2 schematic diagram of hydrodynamic cavitation apparatus
The device comprises an ozone inlet 1, an ozone inlet 2, a water inlet pipe 3, a hydrodynamic cavitation device 4, a sludge area 5, a sludge discharge pipe 6, a cavitation air flotation area 7, an ultrasonic terminal 8, an ultrasonic transducer 9, a shell 10, a slag scraping plate 11, a slag scraping motor 12, a slag discharge groove 13, a slag discharge pipe 14, a photocatalytic oxidation area 15, an ultraviolet lamp tube 16, a photocatalytic partition plate 17, an inclined baffle 18, a water outlet pipe 19, an inclined plate filter 20, an inlet section 21, a contraction section 22, a throat passage 23, a diffusion section 24 and an outlet section.
The specific implementation mode is as follows:
the present invention will be described in detail below with reference to the accompanying drawings.
An ultrasonic technology-based drilling and completion waste liquid recycling treatment device and method are disclosed, as shown in figure 1, the treatment equipment comprises a shell 9, an inclined baffle 17 is arranged in the shell 9, the inclined baffle 17 divides the shell 9 into a cavitation air flotation zone 6 and a photocatalytic oxidation zone 14, specifically, the upper parts of the cavitation air flotation zone 6 and the photocatalytic oxidation zone 14 are communicated, the lower part of the cavitation air flotation zone 6 is provided with a sludge zone 4 and a sludge discharge pipe 5, the side part of the cavitation air flotation zone 6 is connected with a water inlet pipe 2, the water inlet pipe 2 comprises an ozone inlet 1 and a hydrodynamic cavitation device 3, an ultrasonic transducer 8 is arranged in the cavitation air flotation zone 6, the top of the shell 9 is provided with a slag scraping plate 10 and a slag discharging groove 12, the lower part of the photocatalytic oxidation area 14 is provided with an inclined plate filter 19 and a water outlet pipe 18, the photocatalytic oxidation area 14 is internally provided with a photocatalytic clapboard 16 and an ultraviolet light tube 15.
The shell 9 is made of carbon steel in a cylindrical shape, is vertically installed, and has high mobility and small occupied area.
The sludge zone 4, which settles sludge under gravity separation. The sludge discharge pipe 5 is used for discharging sludge.
The inclined baffle 17 is designed to be vertical at the upper end, the inclined design at the lower end is realized, and the inclined plane forms 60-80 degrees on the horizontal plane, so that the drilling and completion waste liquid can form rotational flow, and the polymerization of micro bubbles and grease is promoted.
The slag scraping plate 10 is driven to rotate by a slag scraping motor 11, the slag discharging groove 12 is used for collecting scum generated by rotation of the slag scraping plate 4 and discharging the scum outwards through a slag discharging pipe 13, the slag scraping plate 10 is made of carbon steel, the slag scraping speed is 0.02m/s, and the power of the slag scraping motor 11 is 0.75-2.5 kw. The drilling and completion waste liquid flows to the photocatalytic oxidation zone 14 after being treated by the slag scraping zone at the top of the shell 9.
The photocatalytic oxidation region 14 comprises at least one photocatalytic partition plate 16 axially fixed in parallel to the housing 9, the photocatalytic partition plate 16 comprises a substrate and photocatalytic layers arranged on the surfaces of the two sides of the substrate, a flow channel is formed between the adjacent photocatalytic partition plates 16, an ultraviolet lamp tube 15 is arranged between the adjacent photocatalytic partition plates 16, the power of the ultraviolet lamp tube is 150-200W, after the drilling and completion waste liquid is jointly treated by ozone and photocatalytic oxidizer TiO2, organic pollutants adsorbed on the surfaces of the photocatalytic partition plates 16 are oxidized into inorganic small molecules such as carbon dioxide and water, the treated drilling and completion waste liquid still contains a small amount of rock debris, suspended solids are further removed after the drilling and completion waste liquid passes through an inclined plate filter 19, and finally the treated drilling and completion waste liquid is discharged through a water outlet pipe 18.
The device and the method for recycling the drilling and completion waste liquid by using the ultrasonic technology comprise the following steps:
step 1) the drilling and completion waste liquid enters a hydrodynamic cavitation device 3 from a water inlet pipe 2, ozone is blown into an ozone inlet 1, and the ozone and the drilling and completion waste liquid enter a cavitation air floating zone 6 after being mixed in the water inlet pipe 2.
And 2) after the drilling and completion waste liquid is filled in the cavitation air flotation area 6, turning on an ultrasonic power supply, generating a high-power pulse electric signal by using an ultrasonic generator, transmitting the high-power pulse electric signal to an ultrasonic transducer 8 through an ultrasonic wiring terminal 7, converting the electric signal by the transducer, generating high-power ultrasonic waves to act on the drilling and completion waste liquid to generate cavitation, floating micro bubbles generated by the cavitation, blown ozone bubbles, suspended particles and grease attached to the surfaces of the bubbles under the action of gravity, and simultaneously settling sludge in the drilling and completion waste liquid under the action of gravity.
And 3) after the suspended particles and the grease are supported on the water surface by the micro bubbles, turning on the slag scraping motor 11, driving the slag scraping plate 10 to rotate by the slag scraping motor 11, scraping the suspended particles and the grease on the water surface into the slag discharging groove 12 for storage, and discharging pollutants through the slag discharging pipe 13 after the slag discharging groove 12 is filled.
And 4) subsequently, the drilling and completion waste liquid enters the photocatalytic oxidation area 14, the ultraviolet light tube 15 is opened, the drilling and completion waste liquid flows through the overflow grooves in sequence under the action of gravity, organic pollutants are adsorbed on the photocatalytic partition plate 16, and the organic pollutants in the drilling and completion waste liquid are oxidized into water and carbon dioxide under the action of photocatalytic oxidation.
And 5) the drilling and completion waste liquid after photocatalytic oxidation still contains a small amount of rock debris, the rock debris is effectively intercepted by the inclined plate filter 19, and the drilling and completion waste liquid after treatment meets the requirement of recycling and is discharged out through the water outlet pipe 18.
The above is a specific embodiment of the present invention, and the specific embodiment of the present invention is not limited thereto, and it will be apparent to those skilled in the art that other similar changes may be made without departing from the spirit of the present invention, and this should be construed as the scope of the present invention.
Claims (8)
1. The utility model provides an ultrasonic technology bores completion waste liquid cyclic utilization processing apparatus and method, includes the casing, its characterized in that be equipped with oblique baffle in the casing, oblique baffle separates the casing for cavitation air supporting district and photocatalytic oxidation district, cavitation air supporting district and photocatalytic oxidation district pass through upper portion intercommunication, cavitation air supporting district lower part is equipped with mud district, mud pipe, cavitation air supporting district lateral part and water piping connection, the inlet tube is equipped with ozone air inlet, hydrodynamic cavitation device, the inside ultrasonic transducer that is equipped with of cavitation air supporting district, the casing top is equipped with scum board, slag groove, slag pipe, photocatalytic oxidation district lower part is equipped with swash plate filter, outlet pipe. And a photocatalytic clapboard and an ultraviolet lamp light tube are arranged in the photocatalytic oxidation zone.
2. The device and the method for recycling the waste liquid from well drilling and completion by using the ultrasonic technology as claimed in claim 1, wherein the housing is cylindrical, made of carbon steel, vertically installed, highly movable and small in occupied area.
3. The device and method for recycling waste liquid from well drilling and completion by using ultrasonic technology as claimed in claim 1, wherein said hydraulic cavitating device is a venturi tube, and the length of the inlet section and the outlet section of said venturi tube is 20 cm; the length of the contraction section is 20 mm; the throat part is 1mm in length and 1mm in diameter; the length of the diffusion section is 70 mm; the contraction angle alpha is 15 degrees; the diffusion angle θ is 7 °.
4. The device and the method for recycling the waste drilling and completion liquid by the ultrasonic technology according to claim 1, wherein the inclined baffle has an inclination angle of 60-80 degrees, so that the waste drilling and completion liquid can form a rotational flow to promote the polymerization of micro bubbles and grease.
5. The device and the method for recycling the drilling and completion waste liquid by the ultrasonic technology according to claim 1 are characterized in that the ultrasonic transducer is connected with an ultrasonic generator outside the housing through an ultrasonic terminal, the ultrasonic transducer is fixed in an annular arrangement and an axial parallel manner, 8 ultrasonic transducers are uniformly arranged along the circumference, the ultrasonic frequency of the ultrasonic transducer is 20-60 kHz, and the ultrasonic power is 150-300W.
6. The device and the method for recycling the waste liquid from drilling and completion by using the ultrasonic technology as claimed in claim 1, wherein the scraping plate is driven to rotate by a scraping motor, the slag discharge groove is used for collecting the scum generated by the rotation of the scraping plate and discharging the scum outwards through a slag discharge pipe, the scraping plate is made of carbon steel, the scraping speed is 0.02m/s, and the power of the scraping motor is 0.75-2.5 kw.
7. The device and method for recycling waste drilling and completion fluid by using ultrasonic technology as claimed in claim 1, wherein the photocatalytic oxidation zone comprises at least one photocatalytic partition board axially fixed in parallel to the housing, the photocatalytic partition board comprises a substrate and photocatalytic layers disposed on both side surfaces of the substrate, a flow channel is formed between adjacent photocatalytic partition boards, an ultraviolet lamp tube is disposed between adjacent photocatalytic partition boards, the power of the ultraviolet lamp tube is 150W-200W, and waste drilling and completion fluid passes through ozone and TiO which is a photocatalytic oxidant2Will be adsorbed on the surface of the photocatalytic separator after the co-treatmentThe organic pollutants are oxidized into inorganic micromolecules such as carbon dioxide, water and the like.
8. An ultrasonic technology well drilling and completion waste liquid recycling treatment device and method as claimed in any one of claims 2-7, characterized by comprising the following steps:
step 1) fluid-solid separation is realized on the large-size rock debris vibrating screen of the drilling fluid waste liquid, the solid phase can be discharged along with a vibrating plug, the drilling and completion waste liquid after photocatalytic oxidation still contains a small amount of rock debris, the rock debris is effectively intercepted through an inclined plate filter, and the drilling and completion waste liquid after treatment meets the requirement of recycling and is discharged through a water outlet pipe.
And 2) the drilling and completion waste liquid enters the hydrodynamic cavitation device from the water inlet pipe, ozone is blown into the ozone inlet at the same time, and the ozone and the drilling and completion waste liquid are mixed in the water inlet pipe and then enter the cavitation air flotation zone.
And 3) after the drilling and completion waste liquid is filled in the cavitation air floatation area, turning on an ultrasonic power supply, generating a high-power pulse electric signal by using an ultrasonic generator, transmitting the high-power pulse electric signal to an ultrasonic transducer through an ultrasonic terminal, converting the electric signal by using the transducer, generating high-power ultrasonic waves to act on the drilling and completion waste liquid to generate cavitation, floating micro bubbles generated by the cavitation, blown ozone bubbles, suspended particles and grease attached to the surfaces of the bubbles under the action of gravity, and simultaneously settling sludge in the drilling and completion waste liquid under the action of gravity.
And 4) after the suspended particles and the grease are supported on the water surface by the micro bubbles, turning on a slag scraping motor, driving a slag scraping plate to rotate by the slag scraping motor, scraping the suspended particles and the grease on the water surface into a slag discharging groove for storage, and discharging pollutants through a slag discharging pipe after the slag discharging groove is filled.
And 5) subsequently, the drilling and completion waste liquid enters a photocatalytic oxidation area, an ultraviolet light tube is opened, the drilling and completion waste liquid sequentially flows through each overflow groove under the action of gravity, organic pollutants are adsorbed on a photocatalytic partition plate, and the organic pollutants in the drilling and completion waste liquid are oxidized into water and carbon dioxide under the action of photocatalytic oxidation.
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