Shale gas drilling mud ultrasonic and ozone combined modified microbubble treatment device

Abstract

The utility model belongs to the technical field of shale gas drilling equipment, and particularly relates to a shale gas drilling mud ultrasonic and ozone modified microbubble treatment device which comprises an ozone modified microbubble treatment device and an ozone modified microbubble generation device, and the ozone modified microbubble generation device comprises a pressurization container tank and an ozone generator; the pressurizing container tank is connected with the ozone generator through a pipeline; the ozone modified microbubble treatment device comprises a closed reactor, and the pressurized container tank is connected with the closed reactor through a pipeline; a defoaming sprayer is mounted at the upper part in the closed reactor, a micropore release head is mounted at the bottom of the closed reactor, and an iron screen is mounted in the middle of the closed reactor. Petroleum hydrocarbon, high-molecular polymers and organic pollutants contained in the drilling solid waste are cleaned and oxidized through cooperation of ozone modified microbubbles and ozone catalytic oxidation.

Description

Technical Field

[0001] The utility model belongs to the technical field of shale gas drilling equipment, and particularly relates to a shale gas drilling mud ultrasonic combined with ozone modified micro-bubble treatment device. Background Art

[0002] The shale gas extraction process generates a large amount of solid waste, including water-based drill cuttings, oil-based drill cuttings, waste drilling mud, and sludge. Under unconventional conditions, this can also lead to petroleum hydrocarbon soil contamination. Drill cuttings and waste drilling mud, as well as drilling fluid, contain significant amounts of organic matter, petroleum hydrocarbons, high-molecular-weight oilfield chemicals, and other organic pollutants. These harmful substances threaten human health and damage the ecological environment. Drilling solid waste also has high salt content, high organic matter content, and poor biodegradability. Therefore, achieving the harmless treatment of solid wastes, including water-based drill cuttings, oil-based drill cuttings, waste drilling mud, and sludge, is imperative.

[0003] Drilling solid waste contains a large amount of organic pollutants and high molecular polymers, which form a complex emulsion system with the solid phase. Petroleum hydrocarbons are adsorbed on the surface of the solid phase and are difficult to remove. Common cleaning methods cannot effectively remove these pollutants. The huge specific surface area of ​​modified microbubbles can enhance the stripping of organic pollutants; ozone catalytic oxidation has low efficiency in degrading organic pollutants and requires a large amount of ozone.

[0004] Patent document CN218811312U discloses a drilling waste mud treatment device. While this device utilizes a dehydration tank and heating plate to heat and dehydrate the initially filtered mud, thereby completely drying it, it fails to effectively remove organic pollutants adsorbed on the surface of the drilling mud. Discharge of the dried drilling mud into the environment still poses a threat to humans and the environment. Therefore, there is an urgent need for a drilling waste treatment device that can address these shortcomings. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a shale gas drilling mud ultrasound combined with ozone modified microbubble treatment device, which uses ozone modified microbubbles and ozone catalytic oxidation to synergistically clean and oxidize petroleum hydrocarbons, high molecular polymers and organic pollutants contained in drilling solid waste. While avoiding clogging of the microporous aeration head, the ozone modified microbubbles combined with ultrasound effectively improve the solid waste cleaning efficiency, reduce the residual organic pollutants in the drilling solid waste, reduce the COD value in the solid waste, and realize the harmless treatment of solid waste generated in the shale gas extraction process.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A shale gas drilling mud ultrasound combined with ozone modification microbubble treatment device comprises an ozone modification microbubble treatment device and an ozone modification microbubble generating device. The ozone modification microbubble generating device comprises a pressurized container tank and an ozone generator; the pressurized container tank and the ozone generator are connected by a pipeline; the ozone modification microbubble treatment device comprises a closed reactor, and the pressurized container tank and the closed reactor are connected by a pipeline; a defoaming sprayer is installed on the top of the closed reactor, a microporous release head is installed on the bottom, and an iron screen is installed in the middle.

[0008] Furthermore, a pipeline mixer and a pressure pump are installed on the pipeline between the pressurized container and the closed reactor to enable the addition of the pressurized container solution. Ozone and a surfactant solution generated by the ozone generator are transported to the pressurized container to prepare a pressurized solution. The static mixer and microporous release head achieve static mixing of the material and the cleaning solution to prepare an ozone-modified microbubble cleaning solution.

[0009] Furthermore, the pressurized container is also equipped with a container pressure gauge, a pressure valve and a conductivity meter for monitoring the internal state of the pressure-dissolving tank. The conductivity meter is used to monitor the concentration of the cleaning agent in the dissolving tank and dynamically adjust the concentration and pH.

[0010] Furthermore, a pressure gauge and a safety valve are installed on the top of the closed reactor.

[0011] Furthermore, the closed reactor is also equipped with a movable half-open valve, which is hinged to the bottom of the ozone-modified micro-bubble treatment device and has a length of 25% of the diameter of the ozone-modified micro-bubble treatment device.

[0012] Furthermore, the ratio of height to radius of the ozone-modified microbubble treatment device is 2:1 to 10:1.

[0013] Furthermore, the height of the iron screen is 10% to 50% of the height of the ozone modified microbubble treatment device.

[0014] Furthermore, the iron screen is installed above the bottom of the ozone-modified micro-bubble treatment device and is 15% to 30% of the height of the ozone-modified micro-bubble treatment device.

[0015] Furthermore, the release hole of the microporous release head faces downward, the diameter of the micropore is 1 to 100 mm, and the diameter of the microporous release head is 80% of the diameter of the ozone modified microbubble treatment device.

[0016] Through the above technical solution, compared with the existing technology, the utility model has the following beneficial effects:

[0017] (1) The present invention enhances the removal of hydrophobic organic pollutants from the surface of solid waste by utilizing the large functional hydrophobic surface and interfacial area of ​​ozone-modified microbubbles. Ozone is released upon bubble collapse, and ozone catalytically oxidizes and degrades difficult-to-clean organic pollutants. The two work together to simultaneously clean and oxidize petroleum hydrocarbons, high molecular weight polymers, and organic pollutants, improving treatment efficiency and cleaning effectiveness.

[0018] (2) The utility model combines ozone-modified microbubbles with ultrasound to increase the contact probability between bubbles and materials. The ultrasonic cavitation effect cooperates with ozone-modified microbubbles to enhance the stripping of organic matter. The ultrasonic cavitation effect cooperates with ozone catalytic oxidation to produce a large number of hydroxyl free radicals, effectively improving the catalytic oxidation efficiency of difficult-to-elute organic pollutants.

[0019] (3) The material and pressurized solution of the utility model form strong turbulence in the pipeline mixer, which fully mixes the solid matter with the pressurized solution, improves the material fluid conveying performance, disperses the material into small particles, and increases the probability of contact between the contact material and the ozone-modified microbubbles.

[0020] (4) While avoiding the blockage of the microporous aeration head, the utility model effectively improves the solid waste cleaning efficiency by combining ozone-modified microbubbles with ultrasound, reduces the residual organic pollutants in drilling solid waste, reduces the COD value in solid waste, and realizes the harmless treatment of solid waste generated in the shale gas mining process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the device according to an embodiment of the present utility model;

[0022] Figure 2 This is a top view of the ozone-modified microbubble treatment device according to an embodiment of the present utility model;

[0023] In the figure: 1. Container tank pressure gauge, 2. Pressure valve, 3. Pressurized container tank, 4. Conductivity meter, 5. Ozone generator flow meter, 6. Ozone generator, 7. Flow control valve, 8. Feed pump, 9. Pipeline mixer, 10. Pressurized solution flow control valve, 11. Pressurizing pump, 12. Microporous release head, 13. Movable half-open valve, 14. pH meter, 15. Iron screen, 16. Ozone modified microbubble treatment device, 17. Ultrasonic rod, 18. Defoaming sprayer, 19. Safety valve, 20. Pressure gauge, 21. Overflow weir. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings.

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] like Figure 1 、 2 As shown, this embodiment provides a shale gas drilling mud ultrasonic combined ozone modified microbubble treatment device, which consists of an ultrasonic combined ozone modified microbubble treatment device and an ozone modified microbubble generation system. The ozone modified microbubble generation system includes a pressurized container tank 3, an ozone generator 6, a feed addition point, a pipeline mixer 9, and a pressurized dissolved air solution addition point. The ozone generator 6 converts air into ozone, and the ozone flow rate is controlled by the ozone generator flow meter 5. The ozone is transported to the pressurized container tank 3 through a pipeline, and the solution and material are mixed and added through the flow control valve 7, the feed pump 8, and the pipeline mixer 9. The pressurized dissolved air solution is added using the pressurized solution flow control valve 10 and the pressure pump 11.

[0027] In this embodiment, the ozone generator 6 has a flow rate of 5 to 200 L / min, the liquid used in the pressurized tank 3 is a sodium dodecylbenzenesulfonate solution having a solute concentration of 0.5 wt% to 2.0 wt%, the liquid inlet rate is 3 to 120 L / min, and the pressure of the pressurized tank 3 is 0.2 to 3.5 MPa. A conductivity meter 4 is provided in the middle of the pressurized tank 3 to monitor whether the concentration of the solution in the pressurized tank 3 is normal.

[0028] In this embodiment, the ultrasonic combined with ozone modification microbubble treatment device utilizes a cylindrical closed reactor. A pressure gauge 20, defoaming sprayer 18, safety valve 19, and ultrasonic rod 17 are installed at the top of the treatment device. An overflow weir 21 is located at the top of the treatment device. An iron screen 15 is installed in the middle of the treatment device. A microporous release head 12, a movable half-open valve 13, and a pH meter 14 are located at the bottom of the treatment device. The ultrasonic rod's intermittent high and low frequency operation, combined with the microporous release head, achieves both cleaning and oxidation of organic pollutants.

[0029] In this embodiment, the ratio of the height to the radius of the processing device is 2:1 to 10:1, the height of the iron screen 15 is 10% to 50% of the total height of the processing device, the installation position of the iron screen 15 is 15% to 30% of the height of the processing device from the bottom of the processing device, the surface of the iron screen 15 is loaded with ferrosoferric oxide catalyst particles to improve the efficiency of ozone catalytic oxidation, the screen aperture is 300 to 1000 mesh, and the screen spacing in the reactor is 300 to 900 mm.

[0030] Furthermore, the ultrasonic rod 17 operates alternately at high and low frequencies, and the operating principle is that the frequency is 20-30KHz and the acoustic energy density is 2.5-5w / L for 5s, and the frequency is 50-70KHz and the acoustic energy density is 5-5.5w / L for 3min.

[0031] In this embodiment, the diameter of the micropores of the microporous release head 12 is 1 to 100 mm, the diameter of the microporous release head 12 is 80% of the diameter of the processing device, and the release hole of the microporous release head 12 faces downward; the length of the movable half-open valve 13 is 25% of the diameter of the processing device, and its shape is a fan-shaped trapezoid. It is connected to the bottom of the processing device by a hinge. The movable half-open valve 13 remains normally closed and can only be opened upward, that is, when the microporous release head 12 is in working state, the movable half-open valve 13 is open, and when the microporous release head 12 is in a stopped state, the movable half-open valve 13 is closed to prevent soil particles from clogging the microporous release head 12.

[0032] In this embodiment, the gas partial pressure inside the treatment device is 0.01-0.03 MPa, the pH value inside the treatment device is 6-7, the residence time of the mixed solution is controlled to be 15-30 minutes, and the ozone dosage is 0.02-0.15 g O3 / g solid waste.

[0033] The installation process of the device of the present invention is as follows: the feed pump 8 is turned on, drilling waste is pumped in from the feed port, statically mixed with the pressurized dissolved air solution, and then transported to the ultrasonic combined ozone modified microbubble treatment device. The ozone generator 6 is turned on, the ozone flow rate is controlled to 5-200 L / min, the conductivity meter 4 is used to monitor the concentration of the sodium dodecylbenzenesulfonate solution in the pressurized container tank 3 to ensure that its solute concentration is 0.5wt%-2.0wt%, the liquid feed rate is 3-120 L / min, and the gas-liquid ratio is 1:2. The pressure of the pressurized container tank 3 is controlled to 0.2-3.5 MPa. A portion of the pressurized dissolved air solution is mixed with the material through the feed pump 8, and the other portion is transported to the microporous release head 12 in the ultrasonic combined ozone modified microbubble treatment device through the pressure pump 11. The microporous release head 12 is placed at the bottom to promote uniform mixing of the oily sludge and the cleaning liquid. The release head is installed upside down to prevent clogging of the micropores.

[0034] A safety valve 19, a pressure gauge 20 and a defoaming sprayer 18 are arranged on the upper part of the ultrasonic combined ozone modified microbubble treatment device, and an iron screen 15 is installed in the middle. The installation position of the iron screen 15 is 15% to 30% of the height of the treatment device from the bottom of the treatment device. The iron screen promotes the catalytic oxidation of organic matter by ozone.

[0035] During implementation, the feed pump 8 and the pressurized solution flow control valve 10 are adjusted to maintain a flow ratio of 1:5, and the pH electrode 14 is controlled to maintain a pH of 6-7. When the microporous release head 12 is opened, the movable half-open valve 13 automatically opens; when the microporous release head 12 is closed, the movable half-open valve 13 automatically closes. This structure effectively prevents clogging of the microporous release head 12. After the ultrasonic combined with ozone modified microbubble treatment device has been running for a period of time, when the liquid level exceeds the overflow weir 21, liquid discharge has begun, and the defoaming sprayer 18 is opened to eliminate foam. The unique structure of this device allows for the simultaneous cleaning of modified microbubbles and the ozone oxidation of oil substances, allowing for a continuous cleaning process that significantly improves cleaning efficiency.

[0036] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A shale gas drilling mud ultrasonic combined with ozone modified microbubble treatment device, characterized in that: The invention comprises an ozone-modified microbubble treatment device (16) and an ozone-modified microbubble generating device, wherein the ozone-modified microbubble generating device comprises a pressurized container tank (3) and an ozone generator (6); the pressurized container tank (3) and the ozone generator (6) are connected via a pipeline; the ozone-modified microbubble treatment device (16) comprises a closed reactor, wherein the pressurized container tank (3) and the closed reactor are connected via a pipeline; a defoaming sprayer (18) is installed at the top of the closed reactor, a microporous release head (12) is installed at the bottom, and an iron screen (15) is installed in the middle.

2. The shale gas drilling mud ultrasonic combined with ozone modified microbubble treatment device according to claim 1, characterized in that: A pipeline mixer (9) and a pressure pump (11) are also provided on the pipeline between the pressurized container tank (3) and the closed reactor to achieve the addition of the pressurized container solution.

3. The shale gas drilling mud ultrasonic combined with ozone modified microbubble treatment device according to claim 1, characterized in that: The pressurized container tank (3) is also equipped with a container tank pressure gauge (1), a pressure valve (2) and a conductivity meter (4) for monitoring the internal state of the pressure-dissolved gas tank.

4. The shale gas drilling mud ultrasonic combined with ozone modified microbubble treatment device according to claim 1, characterized in that: A pressure gauge (20) and a safety valve (19) are also installed on the top of the closed reactor.

5. The shale gas drilling mud ultrasonic combined with ozone modified microbubble treatment device according to claim 1, characterized in that: The closed reactor is also equipped with a movable half-open valve (13), which is hinged to the bottom of the ozone-modified micro-bubble treatment device (16), and its length is 25% of the diameter of the ozone-modified micro-bubble treatment device (16).

6. The shale gas drilling mud ultrasonic combined with ozone modified microbubble treatment device according to claim 1, characterized in that: The ratio of the height to the radius of the ozone-modified microbubble treatment device (16) is 2:1 to 10:

1.

7. The shale gas drilling mud ultrasound combined with ozone modified microbubble treatment device according to claim 1, characterized in that: The height of the iron screen (15) is 10% to 50% of the height of the ozone modified microbubble treatment device (16).

8. The shale gas drilling mud ultrasonic combined with ozone modified microbubble treatment device according to claim 1, characterized in that: The iron screen (15) is installed above the bottom of the ozone-modified micro-bubble treatment device (16) and is 15% to 30% of the height of the ozone-modified micro-bubble treatment device (16).

9. The shale gas drilling mud ultrasound combined with ozone modified microbubble treatment device according to claim 1, characterized in that: The release hole of the microporous release head (12) faces downward, the diameter of the micropore is 1 to 100 mm, and the diameter of the microporous release head (12) is 80% of the diameter of the ozone modified microbubble treatment device (16).

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