A fracturing flowback wastewater treatment device

Abstract

This application discloses a fracturing flowback fluid wastewater treatment device, relating to the field of oilfield wastewater treatment technology. The device includes a treatment cylinder connected to an inlet pipe, a outlet pipe, and a water supply component. The water supply component intermittently supplies low-viscosity water into the treatment cylinder. A outlet valve is installed on the outlet pipe. A main stirring rod is rotatably mounted inside the treatment cylinder. A stirring motor connected to the main stirring rod and an output shaft is mounted on the treatment cylinder. A fixed cylinder is located outside the treatment cylinder, forming a heating chamber between them. In use, this device effectively treats fracturing flowback fluid wastewater through the combined action of dilution, stirring, and heating, significantly reducing its viscosity. The treated wastewater can then be directly treated with chemical agents. Because the viscosity of the wastewater is significantly reduced, it does not hinder the diffusion, mixing, and reaction of chemical agents, thus reducing agent dosage, reaction time, and improving treatment efficiency.

Description

Technical Field

[0001] This application relates to the field of oilfield wastewater treatment technology, specifically to a fracturing flowback fluid wastewater treatment device. Background Technology

[0002] Fracturing flowback fluid is a liquid that is returned to the surface from the wellhead after hydraulic fracturing operations during the extraction of unconventional oil and gas resources such as shale gas and shale oil. It is a special type of industrial wastewater in the oil and gas extraction field with complex composition, high treatment difficulty, and high environmental risk. Fracturing flowback fluid contains thickeners or gelling agents, such as guar gum, cellulose derivatives, and polyacrylamide, and has a higher viscosity than ordinary wastewater. If chemical agents are added directly during treatment, the fracturing flowback fluid will hinder the diffusion, mixing, and reaction of the chemical agents, resulting in increased agent dosage, prolonged reaction time, and decreased treatment effect. Therefore, a fracturing flowback fluid treatment device is proposed. Utility Model Content

[0003] The purpose of this application is to address the technical problem that, when chemical agents are directly added during treatment, the fracturing flowback fluid wastewater hinders the diffusion, mixing, and reaction of the chemical agents, leading to increased agent dosage, prolonged reaction time, and decreased treatment efficiency. This application provides a fracturing flowback fluid wastewater treatment device.

[0004] To achieve the above objectives, this application specifically adopts the following technical solution:

[0005] A fracturing flowback fluid wastewater treatment device includes a treatment cylinder, an inlet pipe, a outlet pipe, and a water supply component connected to the treatment cylinder. The water supply component is used to intermittently supply low-viscosity water into the treatment cylinder. A outlet valve is provided on the outlet pipe. A main stirring rod is rotatably installed inside the treatment cylinder. A stirring motor connected to the main stirring rod and an output shaft is provided on the treatment cylinder. A fixed cylinder is arranged outside the treatment cylinder, and a heating chamber is formed between the two. A spiral guide plate is provided inside the heating chamber. The device also includes a heating element for heating the fluid medium and supplying it into the heating chamber.

[0006] Furthermore, the water supply component includes a water storage tank, a shaft is rotatably mounted inside the water storage tank, an impeller is mounted on the shaft, and a reduction motor connected to the output shaft is mounted on the water storage tank.

[0007] Furthermore, an external gear ring is provided inside the processing cylinder, and multiple auxiliary stirring rods are rotatably mounted on the main stirring rod. The auxiliary stirring rods are provided with fixed gears that mesh with the external gear ring.

[0008] Furthermore, the main stirring rod is equipped with a scraper that contacts the bottom surface of the processing cylinder.

[0009] Furthermore, the inner side of the processing cylinder is provided with multiple heat-conducting fins, and the heat-conducting fins are provided with multiple through holes.

[0010] Furthermore, the processing cylinder is equipped with an annular heat-conducting cavity, which is filled with thermally conductive silicone grease.

[0011] Furthermore, the heating element includes a heating cylinder, inside which a spiral heating wire and a spiral tube are provided. The two ends of the spiral tube are respectively connected to a three-way pipe and a delivery pump. The output end of the delivery pump and one end of the three-way pipe are both connected to the heating chamber. The other end of the three-way pipe is provided with a liquid inlet valve.

[0012] Furthermore, both the outer surfaces of the fixed cylinder and the heating cylinder are provided with a heat insulation layer.

[0013] The beneficial effects of this application are as follows:

[0014] When used, this application treats fracturing flowback fluid wastewater through the effective combination of dilution, stirring, and heating, significantly reducing the viscosity of the fracturing flowback fluid wastewater. The treated fracturing flowback fluid wastewater can be directly added with chemical agents. Since the viscosity of the fracturing flowback fluid wastewater has been greatly reduced, it will not hinder the diffusion, mixing, and reaction of chemical agents, thereby reducing the amount of agents used, shortening the reaction time, and improving the treatment effect, thus making it more practical. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural view of this application;

[0016] Figure 2 This is a three-dimensional sectional view of this application;

[0017] Figure 3 This application Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 This application Figure 2 Enlarged view of point B in the middle;

[0019] Figure 5 This application Figure 2 Enlarged view of point C in the middle;

[0020] Figure 6 This application Figure 2 Enlarged view of point D in the middle.

[0021] Reference numerals: 1. Processing cylinder; 2. Inlet pipe; 3. Drain pipe; 4. Drain valve; 5. Main stirring rod; 6. Stirring motor; 7. Fixed cylinder; 8. Heating chamber; 9. Spiral guide plate; 10. Water storage tank; 11. Shaft; 12. Impeller; 13. Gear motor; 14. External gear ring; 15. Secondary stirring rod; 16. Fixed gear; 17. Scraper; 18. Heat-conducting fins; 19. Through hole; 20. Annular heat-conducting chamber; 21. Thermal grease; 22. Heating cylinder; 23. Spiral heating wire; 24. Spiral tube; 25. T-connector; 26. Transfer pump; 27. Inlet valve; 28. Insulation layer. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figures 1-5 As shown in one embodiment of this application, a fracturing flowback fluid wastewater treatment device includes a treatment cylinder 1. An inlet pipe 2, a drain pipe 3, and a water supply component are connected to the treatment cylinder 1. Both the inlet pipe 2 and the water supply component are connected to the top of the treatment cylinder 1, and the drain pipe 3 is connected to the bottom of the treatment cylinder 1. The water supply component is used to intermittently supply low-viscosity water into the treatment cylinder 1. The low-viscosity water is either treated recycled water or fresh water. In this embodiment, treated recycled water is used as the low-viscosity water, which is more energy-efficient and environmentally friendly. A drain valve 4 is installed on the drain pipe 3 and is fixed to the drain pipe 3. A main stirring rod 5 is rotatably installed inside the processing cylinder 1. The axis of the main stirring rod 5 is vertical. A stirring motor 6 connected to the main stirring rod 5 is installed on the processing cylinder 1. The stirring motor 6 is fixed on the processing cylinder 1. A fixed cylinder 7 is installed on the outside of the processing cylinder 1, and a heating chamber 8 is formed between the two. The fixed cylinder 7 is fixed on the outside of the processing cylinder 1. The heating chamber 8 is vertically annular. A spiral guide plate 9 is installed inside the heating chamber 8. The spiral guide plate 9 is fixed inside the heating chamber 8 and its axis is vertical. It also includes a heating element, which is used to heat the fluid medium and supply it into the heating chamber 8.

[0024] Initially, the drain valve 4 is closed. During use, fracturing flowback wastewater is supplied to the treatment cylinder 1 through the inlet pipe 2 to a certain water level. Low-viscosity water is intermittently supplied to the treatment cylinder 1 through the water supply component. By mixing low-viscosity water into the fracturing flowback wastewater, the polymer concentration is reduced, thus diluting the wastewater and lowering its viscosity. Simultaneously, the stirring motor 6 is activated, its output shaft rotates, driving the main stirring rod 5 to rotate as well, mixing the fracturing flowback wastewater and low-viscosity water, breaking down the long polymer chains, and further reducing the viscosity of the fracturing flowback wastewater. Through the combined effect of stirring and intermittent supply of low-viscosity water, the efficiency of viscosity reduction is significantly improved. The viscosity of the fracturing flowback wastewater decreases as the stirring shear rate increases. During simultaneous stirring and dilution, the polymer network structure is immediately destroyed, reducing viscosity. The low-viscosity water, mixed in under stirring conditions, is rapidly dispersed into micro-particles. The droplets achieve micro-mixing, reducing the total dilution water volume, saving water, avoiding local concentration gradients, and improving mixing uniformity. The fluid medium is heated by the heating element and supplied to the heating chamber 8. The fluid medium is guided by the spiral guide plate 9, extending the heat transfer time of the fluid medium. Through the heat transfer of the fluid medium, the fracturing flowback fluid wastewater and low-viscosity water are heated. The temperature increase breaks the hydrogen bonds between polymer molecules, further reducing the viscosity of the fracturing flowback fluid wastewater, thus treating the fracturing flowback fluid wastewater and reducing its viscosity. After treatment, the drain valve 4 is opened, and the fracturing flowback fluid wastewater is discharged through the drain pipe 3. Then, chemical agents can be added to the treated fracturing flowback fluid wastewater. Since the viscosity of the fracturing flowback fluid wastewater has been greatly reduced, it will not hinder the diffusion, mixing and reaction of the chemical agents, reducing the amount of agents used, reducing the reaction time, and improving the treatment effect.

[0025] In summary, this application, through the effective combination of dilution, stirring, and heating, treats fracturing flowback fluid wastewater, significantly reducing its viscosity. The treated wastewater allows for the direct addition of chemical agents. Since the viscosity of the wastewater has been significantly reduced, it does not hinder the diffusion, mixing, and reaction of chemical agents, thus reducing agent dosage, reaction time, and treatment efficiency, making it more practical.

[0026] like Figures 1-3 As shown, the specific structure of the water supply component of this application is disclosed. The water supply component includes a water storage tank 10, which is fixedly installed on the top of the treatment cylinder 1. A shaft 11 is rotatably installed inside the water storage tank 10. The axis of the shaft 11 is in the horizontal direction. An impeller 12 is installed on the shaft 11. The impeller 12 is fixed on the shaft 11 and the two are coaxially distributed. A reduction motor 13 is installed on the water storage tank 10 and connected to the shaft 11. The reduction motor 13 is fixed on the water storage tank 10.

[0027] Referring to the above, during use, the low-viscosity water is stored in the water tank 10, the geared motor 13 is activated, the output shaft rotates, and the shaft 11 and the impeller 12 rotate together. The impeller 12 causes the low-viscosity water to enter the treatment cylinder 1 in batches intermittently, so as to achieve the intermittent supply of low-viscosity water to the treatment cylinder 1.

[0028] like Figure 4 As shown, a further technical solution of this application is disclosed. An external gear ring 14 is provided inside the processing cylinder 1. The external gear ring 14 is fixed on the top surface inside the processing cylinder 1 and is coaxially distributed with the main stirring rod 5. Multiple auxiliary stirring rods 15 are rotatably arranged on the main stirring rod 5. The axis of the auxiliary stirring rods 15 is vertical. The multiple auxiliary stirring rods 15 are arranged in a circular array. A fixed gear 16 that meshes with the external gear ring 14 is provided on the auxiliary stirring rod 15. The fixed gear 16 is fixed on the auxiliary stirring rod 15 and the two are coaxially distributed.

[0029] Referring to the above, when the main stirring rod 5 rotates, it drives multiple auxiliary stirring rods 15 to revolve together. When the auxiliary stirring rods 15 revolve, the fixed gear 16 will mesh with the external gear ring 14 and rotate due to the meshing action, thereby driving the auxiliary stirring rods 15 to rotate on their own axis. This achieves that multiple auxiliary stirring rods 15 rotate synchronously while revolving around the central axis, further improving the mixing effect.

[0030] like Figure 5 As shown, a further technical solution of this application is disclosed. The main stirring rod 5 is provided with a scraper 17 that contacts the bottom surface of the processing cylinder 1. The scraper 17 is horizontal and fixed at the bottom end of the main stirring rod 5.

[0031] Referring to the above, when the main stirring rod 5 rotates, it drives the scraper 17 to rotate as well. The scraper 17 cleans the inner bottom surface of the treatment cylinder 1 to prevent the fracturing backflow wastewater from settling and sticking to the wall.

[0032] like Figure 5 As shown, a further technical solution of this application is disclosed. Multiple heat-conducting fins 18 are provided on the inner side of the processing cylinder 1. The heat-conducting fins 18 are vertical and fixed on the inner side of the processing cylinder 1. The multiple heat-conducting fins 18 are arranged in a ring array. Multiple through holes 19 are constructed on the heat-conducting fins 18. The multiple through holes 19 are arranged in an array along the length direction of the heat-conducting fins 18.

[0033] Referring to the above, during heating, multiple heat-conducting fins 18 can increase and compress the heat transfer surface area of ​​the backflow wastewater, thereby significantly enhancing heat transfer efficiency, shortening heating time, and improving temperature uniformity. During stirring, it can disrupt the circulation pattern, promote radial and axial flow, block tangential flow, force the fluid to change direction, generate strong radial and axial flow, and form more complex turbulence or three-dimensional flow field. This greatly improves the overall mixing efficiency, shortens the mixing time, effectively disrupts the formation of vortices, keeps the liquid surface relatively stable, and enhances shear force, further improving the stirring and mixing effect.

[0034] like Figure 5 As shown, a further technical solution of this application is disclosed. The processing cylinder 1 is constructed with an annular heat-conducting cavity 20. The annular heat-conducting cavity 20 and the processing cylinder 1 are coaxially distributed. The annular heat-conducting cavity 20 is filled with thermally conductive silicone grease 21. The thermally conductive silicone grease 21 is a thermally conductive silicone grease-like composite material made of organosilicone as the main raw material and with the addition of materials with excellent heat resistance and thermal conductivity. It is a high thermal conductivity insulating organosilicone material with excellent thermal conductivity.

[0035] Referring to the above, during heating, the combined effect of the annular heat-conducting cavity 20 and the thermal grease 21 can further enhance heat transfer efficiency, shorten heating time, and improve temperature uniformity.

[0036] like Figures 2-6 As shown, the specific structure of the heating element of this application is disclosed. The heating element includes a heating cylinder 22, in which a spiral heating wire 23 and a spiral tube 24 are disposed. The two ends of the spiral tube 24 are respectively connected to a three-way pipe 25 and a delivery pump 26. The output end of the delivery pump 26 and one end of the three-way pipe 25 are both connected to the heating chamber 8. The input end of the delivery pump 26 is connected to the heating chamber 8 near the top. One end of the three-way pipe 25 is connected to the heating chamber 8 near the bottom. The other end of the three-way pipe 25 is provided with a liquid inlet valve 27, which is fixed on the three-way pipe 25.

[0037] Referring to the above, during use, the inlet valve 27 is opened to connect the other end of the three-way pipe 25 to the equipment storing the fluid medium, so that the delivery pump 26 and the spiral heating wire 23 can work. The fluid medium passes through the three-way pipe 25, the spiral pipe 24, the delivery pump 26 and the heating chamber 8 in sequence. During this process, the fluid medium passing through the spiral pipe 24 is heated by the spiral heating wire 23. After that, the inlet valve 27 is closed, the temperature of the fluid medium decreases and flows back into the three-way pipe 25 to form a circulating flow of the fluid medium, so as to heat the fluid medium and supply it into the heating chamber 8.

[0038] like Figures 5-6As shown, a further technical solution of this application is disclosed, wherein a heat insulation layer 28 is provided on the outer surface of both the fixed cylinder 7 and the heating cylinder 22, and the heat insulation layer 28 covers the outer surface of the fixed cylinder 7 and the heating cylinder 22.

[0039] Referring to the above, during heating, the heat insulation layer 28 can block the heat from spreading outward and reduce heat loss. In this embodiment, the heat insulation layer 28 is made of polyurethane foam, which has the advantages of extremely low thermal conductivity and excellent heat preservation performance.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fracturing flowback fluid wastewater treatment device, characterized in that, The device includes a processing cylinder (1), which is connected to an inlet pipe (2), a drain pipe (3), and a water supply component. The water supply component is used to intermittently supply low-viscosity water into the processing cylinder (1). A drain valve (4) is provided on the drain pipe (3). A main stirring rod (5) is rotatably installed inside the processing cylinder (1). A stirring motor (6) connected to the main stirring rod (5) is provided on the processing cylinder (1). A fixed cylinder (7) is set outside the processing cylinder (1), and a heating chamber (8) is formed between the two. A spiral guide plate (9) is provided inside the heating chamber (8). The device also includes a heating component, which is used to heat the fluid medium and supply it into the heating chamber (8).

2. The fracturing flowback fluid wastewater treatment device according to claim 1, characterized in that, The water supply component includes a water storage tank (10), a shaft (11) is rotatably arranged inside the water storage tank (10), an impeller (12) is arranged on the shaft (11), and a reduction motor (13) connected to the output shaft and the shaft (11) is arranged on the water storage tank (10).

3. The fracturing flowback fluid wastewater treatment device according to claim 1, characterized in that, The processing cylinder (1) is provided with an external gear ring (14), and a plurality of auxiliary stirring rods (15) are rotatably provided on the main stirring rod (5). The auxiliary stirring rods (15) are provided with fixed gears (16) that mesh with the external gear ring (14).

4. The fracturing flowback fluid wastewater treatment device according to claim 1, characterized in that, The main stirring rod (5) is equipped with a scraper (17) that contacts the bottom surface of the processing cylinder (1).

5. The fracturing flowback fluid wastewater treatment device according to claim 1, characterized in that, The inner side of the processing cylinder (1) is provided with a plurality of heat-conducting fins (18), and the heat-conducting fins (18) are provided with a plurality of through holes (19).

6. The fracturing flowback fluid wastewater treatment device according to claim 1, characterized in that, The processing cylinder (1) has an annular heat-conducting cavity (20) inside, and the annular heat-conducting cavity (20) is filled with thermal grease (21).

7. The fracturing flowback fluid wastewater treatment device according to claim 1, characterized in that, The heating element includes a heating cylinder (22), which is provided with a spiral heating wire (23) and a spiral tube (24). The two ends of the spiral tube (24) are respectively connected to a three-way pipe (25) and a delivery pump (26). The output end of the delivery pump (26) and one end of the three-way pipe (25) are both connected to the heating chamber (8). The other end of the three-way pipe (25) is provided with a liquid inlet valve (27).

8. The fracturing flowback fluid wastewater treatment device according to claim 7, characterized in that, The outer surfaces of both the fixed cylinder (7) and the heating cylinder (22) are provided with a heat insulation layer (28).

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