CN113845257B - A device and method for recycling drilling and completion waste liquid using ultrasonic technology - Google Patents

Abstract

The invention provides a device and a method for recycling drilling and completion waste liquid by an ultrasonic technology, comprising a shell, and the device is characterized in that an inclined baffle plate is arranged in the shell, the inclined baffle plate divides the shell into a cavitation air floatation area and a photocatalytic oxidation area, 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 area. The photocatalytic oxidation area is internally provided with a photocatalytic baffle plate and an ultraviolet lamp tube. The invention has the advantages that the hydrodynamic cavitation device and the ultrasonic cavitation device are integrated, and the problem that tiny bubbles generated by the air flotation device are unstable is solved. The treatment equipment combines the hydrodynamic cavitation, ultrasonic wave, ozone catalysis and photocatalysis technologies, promotes the rapid decomposition of ozone to generate more oxidation free radicals, improves the degradation rate of organic matters, reduces the ozone addition amount, reduces the waste liquid treatment operation cost, optimizes the treatment process program, and has important significance for constructing ecological oil fields.

Description

A device and method for recycling drilling and completion waste liquid using ultrasonic technology

Technical field

The invention belongs to the technical field of oil and gas field waste liquid treatment, and in particular relates to a device and method for recycling drilling and completion waste liquid using ultrasonic technology.

Background technique

As important energy and strategic resources, oil and natural gas play a vital role in the rapid development of our country's economy. In recent years, with the increasing intensity of oil and gas extraction, environmental issues during the extraction process have attracted more and more attention. With the increase in oil demand and the development of drilling technology, the number of drilling wells and drilling depth continue to increase. In order to meet the technical requirements of complex geological conditions and drilling and completion engineering, the types of drilling and completion fluids continue to increase, and the number of additives is also increasing. Its composition is extremely complex. Drilling and completion waste liquid is an important type of pollutant produced during the mining process of oil and gas fields. The main sources of drilling and completion waste liquid are the liquid phase in drilling waste, abandoned drilling fluid, sewage and rainwater around the well site, etc.

Drilling and completion waste fluids are characterized by high suspended solids, high oil content, and a certain amount of toxic organic and inorganic pollutants. Heavy metals in drilling waste fluid can easily accumulate in the environment, posing a threat to human and biological life. At the same time, high salt content will reduce the ability of plants to absorb water in the soil and affect plant growth. Therefore, after the drilling and completion operations are completed, the drilling and completion waste fluid should be recycled and processed.

Due to the complex composition of drilling and completion waste liquids, the harmless treatment of drilling and completion waste liquids is greatly difficult. Drilling fluids are usually colloids. The current more effective treatment method for drilling fluids is the chemical gel breaking method, which is to add chemicals such as demulsifiers and flocculants to the waste drilling fluids to destroy the stability of the system and cause the oil in it to aggregate. Precipitation makes drilling fluid harmless, but drilling fluid treated with chemical agents usually cannot be reused. Other treatment methods, such as landfill and solidification methods, cannot achieve the purpose of recycling the treated water quality liquid, which will cause the pollution and waste of a large amount of drilling and completion waste liquid. Therefore, it is proposed to use ultrasonic technology to treat drilling and completion waste fluids, using the cavitation effect of ultrasonic waves to generate oxidizing free radicals and oxidatively degrade organic matter in drilling and completion waste fluids.

Power ultrasound refers to ultrasonic waves with an ultrasonic frequency between 20kHz and 100kHz. When it is applied to water, it will produce a series of physical, chemical and biological effects. As a special form of energy, ultrasound's unique effects mainly include mechanical effects, cavitation effects, thermal effects, chemical effects, etc. Among them, the most important effect in the application of ultrasonic treatment of drilling and completion waste fluid is cavitation. The basic principle is that microbubbles existing in the liquid vibrate under the action of the sound field. When the sound pressure reaches a certain value, the bubbles will expand rapidly. , then closes, creating a shock wave as the bubble closes, eventually collapsing. Cavitation creates high temperatures up to 5000K and pressures up to 50MPa, causing water vapor to split and undergo chain reactions to produce ·OH. ·OH undergoes an oxidation reaction with difficult-to-volatile organic matter and degrades into water and small molecular substances.

At the same time, air flotation technology is used to deal with suspended matter in the drilling and completion waste liquid. The air flotation technology is to blow air into the drilling and completion waste liquid to generate tiny bubbles in the drilling and completion waste liquid. The bubbles are blown under the action of gravity. It will float, and the grease and suspended particles in the drilling and completion waste fluid will adhere to the surface of the bubbles, thereby achieving the purpose of removing suspended matter. The cavitation effect of ultrasonic waves will produce a large number of tiny bubbles, speeding up the air flotation efficiency.

Photocatalysis is a low-cost, environmentally friendly, mild reaction method that can effectively remove pollutants from drilling and completion waste fluids. The degradation mechanism is: the photocatalytic material generates electrons and holes under the excitation of light, and then the holes combine with hydroxide to generate hydroxyl radicals, while the electrons combine with oxygen to generate superoxide radicals. Both of these free radicals are It has strong oxidizing properties and can oxidize organic pollutants adsorbed on the surface of photocatalytic materials into small inorganic molecules such as carbon dioxide and water, thereby purifying wastewater.

However, existing ultrasonic flotation devices still have problems such as too slow bubble speed, large bubbles, and insignificant demulsification and separation effects. The harmless treatment of drilling and completion waste liquids has complicated processes and the equipment occupies a large area. , high energy consumption, high maintenance frequency and other shortcomings.

Contents of the invention

The object of the present invention is to provide a device and method for recycling drilling and completion waste liquid using ultrasonic technology based on the shortcomings of the above-mentioned prior art. The treatment equipment has a simple structure, is easy to use and operate, is pollution-free, has high energy utilization, and has remarkable chemical oxygen demand (COD) and grease removal effects.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A device and method for recycling drilling and completion waste liquid using ultrasonic technology, including a shell, which is characterized in that an inclined baffle is provided in the shell, and the inclined baffle separates the shell into a cavitation air flotation zone and a light Catalytic oxidation zone, the cavitation air flotation zone and the photocatalytic oxidation zone are connected through the upper part, the lower part of the cavitation air flotation zone is provided with a sludge zone and a mud discharge pipe, and the side part of the cavitation air flotation zone is connected to the water inlet pipe , the water inlet pipe is equipped with an ozone air inlet and a hydraulic cavitation device, the cavitation air flotation zone is equipped with an ultrasonic transducer, and the top of the housing is equipped with a slag scraper, a slag discharge tank, and a slag discharge pipe. , the lower part of the photocatalytic oxidation zone is equipped with a inclined plate filter and a water outlet pipe. The photocatalytic oxidation zone is provided with photocatalytic partitions and ultraviolet light tubes inside.

Preferably, the housing is cylindrical, made of carbon steel, installed vertically, has strong mobility, and occupies a small area.

Preferably, the hydraulic cavitation device is a venturi tube, the length of the inlet section and the outlet section of the venturi tube is 20cm; the length of the contraction section is 20mm; the length of the throat is 1mm, and the diameter is 1mm; diffusion The segment length is 70mm; the contraction angle α is 15°; the diffusion angle θ is 7°.

Preferably, the inclined baffle has an inclination angle of 60 to 80°, which can cause the drilling and completion waste liquid to form a swirling flow and promote the polymerization of tiny bubbles and grease.

Preferably, the ultrasonic transducer is connected to the ultrasonic generator outside the housing through an ultrasonic terminal.

Preferably, the ultrasonic transducers are arranged in an annular shape and fixed axially parallel, and eight ultrasonic transducers are evenly arranged along the circumference.

Preferably, the ultrasonic frequency of the ultrasonic transducer is 20-60 kHz, and the ultrasonic power is 150-300 W.

Preferably, the scraper is driven to rotate by a scraper motor, and the scraper is used to collect the scum rotated by the scraper and discharge it outward through the scraper pipe. The material of the scraper is carbon steel. , the scraping speed is 0.02m/s, and the scraping motor power is 0.75~2.5kw.

Preferably, the photocatalytic oxidation zone includes at least one photocatalytic partition fixed axially parallel to the housing. The photocatalytic partition includes a substrate and photocatalytic layers disposed on both sides of the substrate. The adjacent photocatalytic layers A flow channel is formed between the partitions, and an ultraviolet lamp is provided between adjacent photocatalytic partitions. The power of the ultraviolet lamp is 150W to 200W. The drilling and completion waste liquid is jointly treated with ozone and photocatalytic oxidant TiO ₂ Finally, the organic pollutants adsorbed on the surface of the photocatalytic separator 16 are oxidized into small inorganic molecules such as carbon dioxide and water.

Preferably, the device and method for recycling drilling and completion waste liquid using ultrasonic technology as described in the previous item is characterized by including the following steps:

Step 1) The drilling and completion waste liquid enters the hydraulic cavitation device from the water inlet pipe, and ozone is blown into the ozone air inlet at the same time. After the ozone and the drilling and completion waste liquid are mixed in the water inlet pipe, they enter the cavitation air flotation zone.

Step 2) After the drilling and completion waste liquid fills the cavitation air flotation zone, turn on the ultrasonic power supply, use the ultrasonic generator to generate high-power pulse electrical signals, and transmit them to the ultrasonic transducer through the ultrasonic terminal. The transducer can Realize the conversion of electroacoustic signals, and the high-power ultrasonic waves generated act on the drilling and completion waste fluid to produce cavitation. The tiny bubbles generated by the cavitation and the ozone bubbles blown in, as well as the suspended particles and grease attached to the surface of the bubbles, act under the action of gravity. At the same time, the sludge in the drilling and completion waste fluid settles under the action of gravity.

Step 3) After the suspended particles and grease are floated on the water surface by tiny bubbles, turn on the slag scraper motor, and the scraper plate rotates under the drive of the slag scraper motor to scrape the suspended particles and grease on the water surface into the slag discharge tank and store them until After the slag discharge tank is filled, the pollutants are discharged through the slag discharge pipe.

Step 4) Subsequently, the drilling and completion waste liquid enters the photocatalytic oxidation zone, and the UV lamp is turned on. The drilling and completion waste liquid flows through each overflow tank in sequence under the action of gravity, and the organic pollutants are adsorbed on the photocatalytic partition. Under the action of photocatalytic oxidation, organic pollutants in drilling and completion waste fluid are oxidized into water and carbon dioxide.

Step 5) The drilling and completion waste liquid after photocatalytic oxidation still contains a small amount of cuttings, and then the cuttings are effectively intercepted by the inclined plate filter. At this time, the treated drilling and completion waste liquid meets the requirements for recycling, and passes through the outlet pipe. Efflux.

The working principle of the invention is as follows: the hydraulic cavitation device and the ultrasonic device are used to generate micro bubbles. The micro bubbles adsorb suspended particles and grease on the surface to form scum, which is removed by a scraper. At the same time, the inclined baffle creates a swirling flow in the drilling and completion waste liquid, which precipitates the sludge under the action of gravity and promotes the floating of tiny bubbles. At the same time, ozone is introduced into the drilling and completion waste fluid to couple with ultrasonic waves and photocatalysts to remove polluted organic matter in the drilling and completion waste fluid and reduce the COD value in the drilling and completion waste fluid.

The present invention mainly has the following advantages: (1) Scientific and efficient. The hydraulic cavitation device and the ultrasonic device are used to simultaneously generate a large number of microbubbles with small diameters, high air flotation efficiency and strong controllability. At the same time, the cavitation effect generated by ultrasonic waves can improve the efficiency of ozone oxidation of organic matter in drilling and completion waste fluids, and combined with the photocatalytic oxidation effect, the COD value in drilling and completion waste fluids can be greatly reduced. (2) Economic and environmentally friendly. The ozone introduced into the treatment equipment can not only generate tiny bubbles for flotation treatment, but can also couple ultrasonic waves and ultraviolet light to oxidize pollutants in drilling and completion waste fluids, improve ozone utilization and reduce ozone costs. (3) The process is simple and the area is small. As a mature technology in wastewater treatment, air flotation technology and advanced oxidation technology can be applied to the treatment of drilling and completion waste liquid. Secondly, three technologies can be coupled and used based on the principles of different technologies. The designed integrated treatment equipment can treat drilling and completion waste fluid with high efficiency and low energy. The treatment equipment has a simple process and occupies a small area.

Picture description:

Figure 1 Schematic diagram of equipment for recycling drilling and completion waste liquid using ultrasonic technology

Figure 2 Schematic diagram of hydraulic cavitation device

Among them, 1. Ozone air inlet, 2. Water inlet pipe, 3. Hydraulic cavitation device, 4. Sludge area, 5. Sludge discharge pipe, 6. Cavitation air flotation area, 7. Ultrasonic terminal, 8. Ultrasonic wave Transducer, 9. Housing, 10. Slag scraper, 11. Slag scraper motor, 12. Slag discharge tank, 13. Slag discharge pipe, 14. Photocatalytic oxidation zone, 15. Ultraviolet light tube, 16. Photocatalysis Partition, 17. Inclined baffle, 18. Outlet pipe, 19. Inclined plate filter, 20. Inlet section, 21. Contraction section, 22. Throat, 23. Diffusion section, 24. Exit section.

Detailed ways:

The present invention will be described in detail below with reference to the accompanying drawings.

A device and method for recycling drilling and completion waste liquid using ultrasonic technology. As shown in Figure 1, the treatment equipment includes a housing 9, and an inclined baffle 17 is provided inside the housing 9. The inclined baffle 17 will The shell 9 is divided into a cavitation air flotation zone 6 and a photocatalytic oxidation zone 14. Specifically, the cavitation air flotation zone 6 and the photocatalytic oxidation zone 14 are connected at the upper part, and the lower part of the cavitation air flotation zone 6 is provided with a sludge zone 4. , mud discharge pipe 5, the side part of the cavitation air flotation zone 6 is connected with the water inlet pipe 2, the water inlet pipe 2 includes an ozone air inlet 1, a hydraulic cavitation device 3, the cavitation air flotation zone 6 is equipped with an internal There is an ultrasonic transducer 8. The top of the housing 9 is provided with a slag scraper 10 and a slag discharge tank 12. The lower part of the photocatalytic oxidation zone 14 is provided with an inclined plate filter 19 and a water outlet pipe 18. The photocatalytic oxidation area A photocatalytic partition 16 and an ultraviolet light tube 15 are provided inside the area 14 .

The housing 9 is cylindrical, made of carbon steel, installed vertically, has strong mobility, and occupies a small area.

The water inlet pipe 2 is a tangential distribution pipe. The drilling and completion waste liquid enters the cavitation air flotation zone 6 from the water inlet pipe 2. A hydraulic cavitation device 3 is provided inside the water inlet pipe 2, wherein the hydraulic cavitation device 3 is a venturi. Inside the pipe, the hydraulic cavitation device 3 includes an inlet section 20, a contraction section 21, a throat 22, a diffusion section 23, and an outlet section 24. The inlet section 20 and the outlet section 24 are pipes with a length of 20cm and a diameter of 4mm. In order to stabilize the flow of drilling and completion waste liquid at the inlet and outlet of the venturi tube, the length of the contraction section 21 is 20mm, the length of the throat 24 is 1mm, the diameter is 1mm, the length of the diffusion section 23 is 70mm, and the contraction angle α is 15 °, and the diffusion angle θ is 7°. The upper part of the water inlet pipe 2 is provided with an ozone air inlet 1 for injecting ozone into the housing, where the ozone concentration is 10-40 mg/L.

In the sludge area 4, sludge is precipitated under gravity separation. The sludge discharge pipe 5 is used to discharge sludge.

The inclined baffle 17 is designed with the upper end vertical and the lower end inclined, with the inclined surface forming an angle of 60 to 80° on the horizontal plane. This is mainly used to make the drilling and completion waste liquid form a swirling flow and promote the polymerization of tiny bubbles and grease.

The ultrasonic transducer 8 is connected to the ultrasonic generator outside the housing through the ultrasonic terminal 7. There are two groups of ultrasonic transducers 8 arranged on the upper part of the cavitation air flotation zone 6, which are arranged in an annular manner and fixed in parallel in the axial direction. Each group Twelve ultrasonic transducers are evenly arranged along the inner circumference of the cavitation air flotation zone 6. The ultrasonic frequency of the ultrasonic transducers 8 is 20-60kHz and the ultrasonic power is 150-300W. The cavitation air flotation zone 6 can use an ultrasonic transducer to produce ultrasonic cavitation, combined with the cavitation produced by a hydraulic cavitation device, to generate ultra-fine bubbles to remove grease, suspended particles, etc. in the drilling and completion waste fluid. The scum is transported to the scraper plate 10.

The slag scraper 10 is driven to rotate by the slag scraper motor 11. The slag discharge groove 12 is used to collect the scum rotated by the slag scraper 4 and discharge it outward through the slag discharge pipe 13. The scraper 10 is made of carbon steel. The scraping speed is 0.02m/s, and the power of the scraping motor 11 is 0.75~2.5kw. The drilling and completion waste liquid flows through the slag scraping area on the top of the housing 9 for treatment and then flows to the photocatalytic oxidation area 14 .

The photocatalytic oxidation zone 14 includes at least one photocatalytic partition 16 fixed axially parallel to the housing 9. The photocatalytic partition 16 includes a substrate and photocatalytic layers disposed on both sides of the substrate. Adjacent photocatalytic partitions A flow channel is formed between the plates 16, and an ultraviolet lamp 15 is provided between adjacent photocatalytic partitions 16. The power of the ultraviolet lamp is 150W to 200W. The drilling and completion waste liquid passes through the combination of ozone and photocatalytic oxidant TiO2. After treatment, the organic pollutants adsorbed on the surface of the photocatalytic partition 16 are oxidized into small inorganic molecules such as carbon dioxide and water. The treated drilling and completion waste liquid still contains a small amount of cuttings, and then passes through the inclined plate filter 19 to further Suspended solids are removed, and the final treated drilling and completion waste liquid is discharged through the outlet pipe 18.

The device and method for recycling drilling and completion waste liquid using ultrasonic technology include the following steps:

Step 1) The drilling and completion waste liquid enters the hydraulic cavitation device 3 from the water inlet pipe 2, and at the same time, ozone is blown into the ozone air inlet 1. After the ozone and the drilling and completion waste liquid are mixed in the water inlet pipe 2, they enter the cavitation air flotation Zone 6.

Step 2) After the drilling and completion waste liquid is filled with the cavitation air flotation zone 6, turn on the ultrasonic power supply, use the ultrasonic generator to generate a high-power pulse electrical signal, and transmit it to the ultrasonic transducer 8 through the ultrasonic terminal 7. The energizer can realize the conversion of electroacoustic signals, and the high-power ultrasonic waves generated act on the drilling and completion waste fluid to produce cavitation. The tiny bubbles produced by the cavitation and the ozone bubbles blown in will also absorb the suspended particles and grease attached to the surface of the bubbles. It floats up under the action of gravity, while the sludge in the drilling and completion waste fluid settles under the action of gravity.

Step 3) After the suspended particles and grease are floated on the water surface by tiny bubbles, turn on the scraper motor 11. The scraper plate 10 rotates under the drive of the scraper motor 11 to scrape the suspended particles and grease on the water surface into the slag discharge tank 12. Store it, and then discharge the pollutants through the slag discharge pipe 13 after the slag discharge tank 12 is filled.

Step 4) Subsequently, the drilling and completion waste liquid enters the photocatalytic oxidation zone 14, and the ultraviolet lamp 15 is turned on. The drilling and completion waste liquid flows through each overflow tank in sequence under the action of gravity, and the organic pollutants are adsorbed on the photocatalytic partitions. 16, under the action of photocatalytic oxidation, organic pollutants in drilling and completion waste fluid are oxidized into water and carbon dioxide.

Step 5) The drilling and completion waste liquid after photocatalytic oxidation still contains a small amount of cuttings, and the cuttings are effectively intercepted by the inclined plate filter 19. At this time, the treated drilling and completion waste liquid meets the requirements for recycling, and is discharged through the outlet. Water pipe 18 is discharged externally.

The above is a specific embodiment of the present invention. The specific implementation of the present invention is not limited to this. For those skilled in the art, other similar changes can be made without departing from the idea of the present invention. This should all be regarded as the protection scope of the technical solution of the present invention.

Claims (5)

1. A method for recycling drilling and completion waste liquid using ultrasonic technology, which is characterized by including the following steps: Step 1) The drilling and completion waste liquid enters the hydraulic cavitation device from the water inlet pipe, and ozone is blown into the ozone air inlet at the same time. After the ozone and the drilling and completion waste liquid are mixed in the water inlet pipe, they enter the cavitation air flotation zone; Step 2) After the drilling and completion waste liquid fills the cavitation air flotation zone, turn on the ultrasonic power supply, use the ultrasonic generator to generate high-power pulse electrical signals, and transmit them to the ultrasonic transducer through the ultrasonic terminal. The ultrasonic transducer realizes The high-power ultrasonic waves generated by the conversion of electroacoustic signals act on the drilling and completion waste fluid to produce cavitation. The tiny bubbles produced by the cavitation, the ozone bubbles blown in, and the suspended particles and grease attached to the surface of the bubbles are released under the action of gravity. Float while the sludge in the drilling and completion waste fluid settles under the action of gravity; Step 3) After the suspended particles and grease are floated on the water surface by tiny bubbles, turn on the slag scraper motor, and the scraper plate rotates under the drive of the slag scraper motor to scrape the suspended particles and grease on the water surface into the slag discharge tank and store them until After the slag discharge tank is filled, the pollutants are discharged through the slag discharge pipe; Step 4) Subsequently, the drilling and completion waste liquid enters the photocatalytic oxidation zone, and the UV lamp is turned on. The drilling and completion waste liquid flows through each overflow tank in sequence under the action of gravity, and the organic pollutants are adsorbed on the photocatalytic partition. Under the action of photocatalytic oxidation, organic pollutants in drilling and completion waste fluid are oxidized into water and carbon dioxide; Step 5) The large-size cuttings vibrating screen realizes fluid-solid separation, and the solid phase is discharged with the vibrating screen. The drilling and completion waste liquid after photocatalytic oxidation still contains a small amount of cuttings, and then the cuttings are effectively intercepted by the inclined plate filter. This When the treated drilling and completion waste liquid meets the requirements for recycling, it will be discharged through the outlet pipe; The equipment used in this step includes a shell, and an inclined baffle is provided in the shell. The inclined baffle separates the shell into a cavitation air flotation zone and a photocatalytic oxidation zone. The cavitation air flotation zone and the photocatalytic oxidation zone are Communicated through the upper part, the lower part of the cavitation and air flotation zone is provided with a sludge area and a mud discharge pipe. The side of the cavitation and air flotation zone is connected to a water inlet pipe. The water inlet pipe is equipped with an ozone air inlet and a hydraulic cavitation Device, the cavitation air flotation zone is provided with an ultrasonic transducer, the top of the housing is provided with a slag scraper, a slag discharge tank, and a slag discharge pipe, and the lower part of the photocatalytic oxidation zone is provided with a sloping plate filter, Water outlet pipe; the photocatalytic oxidation zone is provided with a photocatalytic partition and an ultraviolet light tube; The inclined baffle has an inclination angle of 60 to 80°, which causes the drilling and completion waste liquid to form a swirling flow and promote the polymerization of tiny bubbles and grease; The photocatalytic oxidation zone includes at least one photocatalytic partition fixed axially parallel to the housing. The photocatalytic partition includes a substrate and photocatalytic layers disposed on both sides of the substrate. Between adjacent photocatalytic partitions, A flow channel is formed between adjacent photocatalytic partitions, and an ultraviolet lamp is arranged between adjacent photocatalytic partitions. The power of the ultraviolet lamp is 150W to 200W. After the drilling and completion waste liquid is jointly treated with ozone and photocatalytic oxidant _TiO2 , The organic pollutants adsorbed on the surface of the photocatalytic separator are oxidized into small inorganic molecules such as carbon dioxide and water. 2. An ultrasonic technology drilling and completion waste liquid recycling treatment method according to claim 1, characterized in that: the housing is cylindrical, made of carbon steel, installed vertically, and has strong movement Sexy and small footprint. 3. A method for recycling drilling and completion waste liquid using ultrasonic technology according to claim 2, characterized in that: the hydraulic cavitation device is a venturi tube, and the inlet section and outlet section of the venturi tube The length is 20cm; the length of the contraction section is 20mm; the throat length is 1mm and the diameter is 1mm; the length of the diffusion section is 70mm; the contraction angle α is 15°; the diffusion angle θ is 7°. 4. A method for recycling drilling and completion waste liquid using ultrasonic technology according to claim 3, characterized in that: the ultrasonic transducer is connected to the ultrasonic generator outside the housing through an ultrasonic terminal, and the ultrasonic wave The transducers are arranged in an annular shape and fixed axially parallel, and eight ultrasonic transducers are evenly arranged along the circumference. The ultrasonic transducers have an ultrasonic frequency of 20 to 60 kHz and an ultrasonic power of 150 to 300 W. 5. A method for recycling drilling and completion waste liquid using ultrasonic technology according to claim 4, characterized in that: the scraper plate is driven to rotate by a scraper motor, and the slag discharge tank is used to collect the scraper. The scum rotated by the plate is discharged outward through the slag discharge pipe. The material of the scraper plate is carbon steel, the scraping speed is 0.02m/s, and the power of the scraping motor is 0.75~2.5kw.