Oil field fracturing flow-back fluid microbubble air flotation oil removal equipment

Abstract

The utility model discloses oil field fracturing flow-back fluid microbubble air floatation oil removal equipment which comprises an air floatation tank, a processing support is arranged on the air floatation tank, lifting hydraulic push rods are arranged on the processing support, and the lifting hydraulic push rods are arranged on the processing support in pairs in parallel. A microbubble air flotation oil removal technology is adopted, generated tiny bubbles are efficiently attached to the surfaces of oil drops of the flowback fluid, the density of the oil drops is reduced, the oil drops are promoted to rapidly float upwards, efficient oil-water separation is achieved, the oil concentration of the treated fluid is greatly reduced, and the strict emission or reuse standard is met; multiple links work cooperatively, stirring and feeding are rapid and stable, it is guaranteed that raw materials and flowback fluid are fully mixed, aeration is uniform, a large number of microbubbles are released to accelerate floating of oil drops, oil layers on liquid levels at different positions are accurately scraped through oil scraping, all links are tightly matched, the treatment time is shortened, and the overall efficiency is improved; a large amount of flowback fluid can be treated in time to avoid overstocking to influence production.

Description

Technical Field

[0001] This utility model relates to the field of backflow fluid treatment technology, specifically to a microbubble flotation oil removal device for oilfield fracturing backflow fluid. Background Technology

[0002] In oilfield production, fracturing is an important way to increase the production of oil and gas wells, but it also generates a large amount of flowback fluid containing crude oil, suspended solids, chemical additives, and impurities. If discharged directly without effective treatment, it will pollute the environment and waste petroleum resources. Therefore, efficient treatment and recovery of flowback fluid is a critical problem that urgently needs to be solved. However, traditional oil-water separation methods, such as gravity sedimentation and centrifugation, are difficult to completely separate oil and water when faced with small and numerous emulsified oil droplets in the flowback fluid. The oil concentration in the treated liquid is still relatively high. Some traditional processes are complex, require large equipment, have long processing times, and are inefficient, failing to meet the demand for timely treatment of flowback fluid and easily causing backlogs that affect production. Furthermore, traditional methods do not fully recover petroleum resources, lack means of oil layer collection and reuse, and have low resource utilization rates. At the same time, some traditional processing equipment has poor operational stability, key components are prone to wear and corrosion, frequent shutdowns for maintenance increase costs and difficulty, and are poorly adaptable to changes in the composition and properties of the flowback fluid, making the treatment effect susceptible to fluctuations. Against this backdrop, microbubble flotation oil removal technology has become an effective way to solve traditional treatment problems due to its advantages such as good treatment effect, high efficiency and stable operation. However, to realize its widespread application in the treatment of oilfield fracturing flowback fluid, it is necessary to design a special treatment equipment with multi-functional modules such as stirring and feeding, aeration, oil scraping, reflux and storage, and diversion. In view of this, in-depth research was conducted on the above problems, which led to this case. Utility Model Content

[0003] To achieve the above objectives, this utility model provides the following technical solution: a microbubble flotation oil removal device for oilfield fracturing flowback fluid, comprising a flotation tank, a processing support on the flotation tank, and lifting hydraulic push rods arranged in two pairs, installed parallel to each other on the processing support. Lifting plates are provided on the pushing ends of the two pairs of lifting hydraulic push rods. Multiple stirring shafts are installed on the lifting plates, and these shafts are installed parallel to each other on the lifting plates via bearings. A raw material tank is provided on the processing support, and a feeding pump is provided on the raw material tank. The feeding pump is equipped with... The system includes a diversion pipe with multiple siphon tubes arranged in a J-shape. Each siphon tube is inserted into a stirring shaft tube via bearings. A stirring gear set is mounted on the stirring shaft tube, comprising multiple stirring gears, multiple transmission gears, and a stirring drive motor. The stirring drive motor is mounted on a processing bracket. The multiple stirring gears are respectively mounted on the stirring drive motor and the multiple stirring shaft tubes. The transmission gears are inserted into a lifting plate and mesh with the paired stirring gears. An aerator is installed on the flotation tank, and an aeration diversion pipe is installed on the aerator.

[0004] Preferably, the flotation tank is equipped with an oil skimmer, which includes a pair of scraping rollers and a pair of lifting rollers. The flotation tank has two pairs of lifting adjustment slots, with lifting bearing blocks on the inner sides of the two pairs of lifting adjustment slots. The pair of lifting rollers are respectively inserted into the inner sides of the two pairs of lifting adjustment slots. The inner side of the lifting adjustment slot has a pair of lifting slides. The lifting bearing blocks are equipped with a pair of lifting sliders, which are respectively movably inserted into the inner sides of the pair of lifting slides. The inner side of the lifting adjustment slot is equipped with an adjusting electromagnet. The lifting bearing blocks are equipped with adjusting magnets. The inner side of the pair of lifting slides is equipped with a buffer spring. The pair of scraping rollers and the pair of lifting rollers are equipped with scraping belts, and the scraping belts are equipped with multiple scrapers.

[0005] Preferably, the flotation tank is equipped with a partition plate, a reflux pump, and a reflux pipe, which is connected to the flotation tank.

[0006] Preferably, the flotation tank is equipped with an oil storage tank.

[0007] Preferably, the aeration diversion pipe is equipped with multiple micro-nano aerators.

[0008] Preferably, the flotation tank is equipped with an L-shaped guide plate. Beneficial effects

[0009] This utility model provides a microbubble flotation oil removal device for oilfield fracturing flowback fluid. It offers the following advantages: This device utilizes microbubble flotation technology, generating tiny bubbles that efficiently adhere to the surface of oil droplets in the flowback fluid, reducing droplet density and promoting rapid floating, thus achieving efficient oil-water separation. This significantly reduces the oil concentration in the treated liquid, meeting stringent discharge or reuse standards. The device boasts significant processing efficiency through multi-stage collaborative operation. Rapid and stable mixing and feeding ensure thorough mixing of the feedstock and flowback fluid. Uniform aeration releases a large number of microbubbles to accelerate oil droplet floating. Precise oil scraping removes oil layers from different locations on the fluid surface. Close coordination among all stages shortens processing time and improves overall efficiency, enabling timely processing of large quantities of flowback fluid and preventing accumulation that could impact production. Furthermore, it ensures full resource recovery, with a dedicated oil storage tank for centralized collection of scraped oil. The oil layer scraped off by the skimmer facilitates subsequent processing and recycling, improving petroleum resource utilization, reducing waste, and achieving a win-win situation for both economic and environmental benefits. The skimmer operates stably and reliably, with rationally designed components. For example, the lifting bearing block, through the cooperation of the lifting slider and slide rail, and the coordination of the adjusting electromagnet and magnet, along with the inclusion of a buffer spring, ensures smooth operation of the skimmer. It is also highly adaptable to changes in the composition and properties of the returned liquid, maintaining stable treatment results under complex operating conditions, reducing equipment failures and downtime for maintenance, and lowering operating costs and maintenance difficulty. The process is optimized and rationally designed. The flotation tank is equipped with partitions to divide different areas, optimizing the treatment process. L-shaped guide plates guide the liquid to flow evenly, avoiding local obstructions or dead zones, making the entire treatment process more stable and efficient, further enhancing the equipment's processing performance. Attached Figure Description

[0010] Figure 1 This is a front sectional view of the microbubble flotation oil removal equipment for oilfield fracturing flowback fluid described in this utility model.

[0011] Figure 2 This is a side cross-sectional view of the microbubble flotation oil removal equipment for oilfield fracturing flowback fluid described in this utility model.

[0012] Figure 3 for Figure 1 A magnified view of the letter "A" in the image.

[0013] In the diagram: 1. Flotation tank; 2. Processing support; 3. Lifting hydraulic push rod; 4. Lifting plate; 5. Agitator shaft tube; 6. Raw material box; 7. Feed pump; 8. Diversion pipe; 9. Siphon pipe; 10. Agitator gear; 11. Transmission gear; 12. Agitator drive motor; 13. Aerator; 14. Aeration diversion pipe; 15. Lifting adjustment trough; 16. Lifting bearing block; 17. Lifting slider; 18. Adjusting electromagnet; 19. Adjusting magnet; 20. Buffer spring. Detailed Implementation

[0014] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires. Appropriate controllers and encoders should be selected according to the actual situation to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control further. Example

[0016] Please see Figure 1-3 Traditional oil-water separation methods, such as gravity settling and centrifugal separation, often fail to achieve ideal separation results when treating oilfield fracturing flowback fluid. Because the oil droplets in the flowback fluid are small and contain a large amount of emulsified oil, these methods cannot effectively cause the droplets to coalesce and float, resulting in incomplete oil-water separation. The treated liquid still contains a high concentration of oil, making it difficult to meet the requirements for subsequent treatment or reuse. Furthermore, some traditional processing procedures are complex, require large equipment footprints, and have long processing times, leading to low processing efficiency. In oilfield production, large quantities of flowback fluid need to be treated promptly; inefficient treatment methods cannot meet actual production needs, easily causing flowback fluid accumulation and affecting normal production operations.

[0017] Therefore, this application protects the microbubble flotation oil removal equipment for oilfield fracturing flowback fluid. By extending and retracting two pairs of lifting hydraulic push rods 3 on the processing support 2, the lifting plate 4 on it is driven to move stably up and down. The lifting plate 4 drives the stirring drive motor 12 on it to run. The stirring drive motor 12 drives the stirring gear 10 on it to rotate. The stirring gear 10 drives the transmission gear 11 that meshes with it. The transmission gear 11 drives the stirring gear 10 that meshes with it, thereby transmitting the stirring gear 10 and the transmission gear 11 one by one. The stirring gear 10 drives the stirring shaft tube 5 on it to rotate. Thus, while the multiple stirring shaft tubes 5 are stably raised, lowered, stirred and rotated, the raw material inside the raw material box 6 is guided to the inside of the diversion pipe 8 by the feeding pump 7. The raw material is guided to the inside of the stirring shaft tube 5 by the siphon pipe 9 on the diversion pipe 8. The raw material is stably fed by the siphon principle of the siphon pipe 9. The aerator 13 aerates the aeration diversion pipe 148, thereby aerating the flotation tank 1.

[0018] Furthermore, by adjusting the cooperation between the electromagnet 18 and the buffer spring 20, the position of the adjusting magnet 19 and the lifting bearing block 16 is adjusted. By cooperating between the lifting slider 17 and the lifting slide, the lifting roller is changed. In turn, by cooperating between the lifting roller and the scraping roller, the position of the scraping belt and the scraper is changed.

[0019] In summary, the two pairs of parallel-mounted lifting hydraulic push rods 3 on the processing support 2 extend and retract under the command of the control system, driving the connected lifting plate 4 to rise and fall stably. Multiple parallel-mounted stirring shaft tubes 5 on the lifting plate 4 are connected to it via bearings and can rotate flexibly. Simultaneously, the stirring drive motor 12 mounted on the processing support 2 serves as a power source. After starting, it drives the stirring gear 10 on it to rotate, which in turn drives the transmission gear 11 through gear meshing, and then transmits the power to the other stirring gears 10 one by one. This causes the stirring gears 10 mounted on the stirring shaft tubes 5 to drive the shaft tubes to rotate synchronously and stably. When the stirring shaft tubes 5 rotate, the feed pump 7 diverts the raw materials required for processing the return liquid in the raw material tank 6 to the diversion pipe 8, and then through the J bearings inserted into the stirring shaft tubes 5... The siphon pipe 9 uses the siphon principle to stably feed the material to the inside of the stirring shaft pipe 5, ensuring thorough mixing of the raw material and the return liquid. After the aerator 13 is started, it aerates the aeration diversion pipe 148, where multiple micro-nano aerators refine the gas into tiny bubbles and release them evenly into the flotation tank 1. The bubbles adhere to oil droplets, causing them to float to the surface and achieve preliminary oil-water separation. The oil skimmer on the flotation tank 1 is used to remove the oil layer from the surface. A pair of lifting rollers are inserted into the inside of two pairs of lifting adjustment grooves 15 on the flotation tank 1. The lifting bearing block 16 in the lifting adjustment groove 15 achieves stable sliding through the lifting slider 17 and the lifting slide rail. The adjusting electromagnet 18 and the... The adjusting magnet 19 on the lifting bearing block 16, under the buffering and stabilizing effect of the buffer spring 20, drives the lifting bearing block 16 to move, thereby changing the position of the lifting roller. This causes the positions of the pair of scraping rollers and the scraping belts and scrapers on the pair of lifting rollers to change accordingly, accurately scraping and collecting the oil layer on the liquid surface at different positions. The partition plate on the flotation tank 1 divides it into different areas to optimize the treatment process. The return pump circulates the treated liquid back through the return pipe, promoting oil-water separation and improving oil removal efficiency. The oil storage tank on the flotation tank 1 collects the scraped oil layer for subsequent treatment and recycling. In addition, the L-shaped guide plate on the flotation tank 1 guides the liquid flow, changing its direction and speed, so that the liquid is evenly distributed and avoids local flow obstruction or dead zones.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microbubble flotation oil removal device for oilfield fracturing flowback fluid, characterized in that, The system includes an air flotation tank, on which a processing support is mounted. The processing support is equipped with two pairs of lifting hydraulic push rods, each pair installed parallel to the other on the processing support. Each pair of lifting hydraulic push rods has a lifting plate at its pushing end. Multiple stirring shafts are mounted on the lifting plates, and these shafts are installed parallel to each other via bearings. A raw material tank is mounted on the processing support, and a feeding pump is mounted on the raw material tank. A diversion pipe is mounted on the feeding pump, and multiple siphon pipes are mounted on the diversion pipe. The siphon tube is J-shaped and is inserted into the stirring shaft tube via bearings. The stirring shaft tube is equipped with a stirring gear set, which includes multiple stirring gears, multiple transmission gears, and a stirring drive motor. The stirring drive motor is mounted on a processing bracket. The multiple stirring gears are respectively mounted on the stirring drive motor and the multiple stirring shaft tubes. The transmission gears are inserted into the lifting plate and mesh with the pairs of stirring gears. An aerator is installed on the flotation tank, and an aerator is equipped with an aeration diversion pipe.

2. The microbubble flotation oil removal equipment for oilfield fracturing flowback fluid according to claim 1, characterized in that, The flotation tank is equipped with an oil skimmer, which includes a pair of scraping rollers and a pair of lifting rollers. The flotation tank has two pairs of lifting adjustment slots, with lifting bearing blocks on the inner sides of each pair of slots. Each pair of lifting rollers is inserted into the inner sides of the two pairs of lifting adjustment slots. Each lifting adjustment slot has a pair of lifting slides on its inner side. Each lifting bearing block has a pair of lifting sliders, which are movably inserted into the inner sides of the pair of lifting slides. Each lifting adjustment slot has an adjusting electromagnet, and each lifting bearing block has an adjusting magnet. Each pair of lifting slides has a buffer spring on its inner side. Each pair of scraping rollers and each pair of lifting rollers is equipped with a scraping belt, and the scraping belt has multiple scrapers.

3. The microbubble flotation oil removal equipment for oilfield fracturing flowback fluid according to claim 2, characterized in that, The flotation tank is equipped with a partition plate, a reflux pump, and a reflux pipe, which is connected to the flotation tank.

4. The microbubble flotation oil removal equipment for oilfield fracturing flowback fluid according to claim 3, characterized in that, An oil storage tank is installed on the flotation tank.

5. The microbubble flotation oil removal equipment for oilfield fracturing flowback fluid according to claim 4, characterized in that, The aeration diversion pipe is equipped with multiple micro-nano aerators.

6. The microbubble flotation oil removal equipment for oilfield fracturing flowback fluid according to claim 5, characterized in that, The flotation tank is equipped with an L-shaped flow guide plate.

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