Fracturing flowback fluid efficient pretreatment equipment

Abstract

The utility model discloses a kind of fracturing flowback fluid efficient pretreatment equipment, including shell assembly, shell assembly is divided into oxidation gel breaking unit, coagulation precipitation unit and magnetic powder recovery unit according to liquid processing sequence in, oxidation gel breaking unit includes oxidation gel breaking groove, oxidation gel breaking groove is used to reduce the viscosity of liquid, coagulation precipitation unit includes coagulation groove, magnetic mixing groove, flocculation groove and clarifying tank according to liquid processing sequence, oxidation gel breaking groove and coagulation groove are adjacent, magnetic powder recovery unit includes sludge treatment assembly and reflux component, sludge treatment assembly and reflux component are used to carry out cyclic processing or processing discharge to sludge.The utility model is by setting oxidation gel breaking groove in coagulation groove front end, so that fracturing flowback fluid is reduced the viscosity of liquid before being handled first, make water not be fully broken glue in glue, reduce colloid to water suspended matter and colloid's package, improve coagulation precipitation reaction effect, ensure that the concentration of effluent suspended matter significantly reduces.

Description

Technical Field

[0001] This utility model relates to the field of fracturing flowback fluid treatment technology, specifically a high-efficiency pretreatment device for fracturing flowback fluid. Background Technology

[0002] Hydraulic fracturing technology is widely used in the development of unconventional oil and gas resources such as shale gas, tight oil, and coalbed methane. Hydraulic fracturing involves injecting fracturing fluid containing various chemical additives and proppant into the formation using high-pressure equipment. This creates fractures in the formation, increasing the permeability of the oil and gas reservoir and thus improving oil and gas production. After fracturing, a large amount of fracturing fluid mixed with formation water, crude oil, and solid particles is returned to the surface, forming fracturing flowback fluid. This flowback fluid has complex characteristics and is difficult to treat. On the one hand, it has physical properties such as high salinity, high hardness, and high suspended solids; on the other hand, it contains a large amount of organic pollutants, such as guar gum and its derivatives, crosslinking agents, bactericides, and surfactants, which are typically present in high concentrations, and some organic compounds are biotoxic or difficult to degrade.

[0003] In China, the treatment of fracturing flowback fluid mainly adopts the process route of "pretreatment-deep treatment-reuse or discharge in compliance with standards". The removal effect of suspended solids and colloids in the water directly affects the stable operation of the entire system. At present, the main pretreatment methods are coagulation and sedimentation to remove suspended solids and colloids in the water. That is, by adding coagulants (PAC) and flocculants (PAM) to make suspended solids and colloids flocculate and settle. However, in the actual application of fracturing flowback fluid pretreatment, this method may not completely remove suspended solids, thus reducing the sedimentation effect of high-efficiency fracturing flowback fluid pretreatment equipment on fine particles. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-efficiency pretreatment device for fracturing flowback fluid, thus solving the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency pretreatment device for fracturing flowback fluid, comprising a shell assembly. The shell assembly is divided into an oxidation breaking unit, a coagulation and sedimentation unit, and a magnetic powder recovery unit according to the liquid processing sequence. The oxidation breaking unit includes an oxidation breaking tank located at the front end of the shell assembly, used to reduce the viscosity of the liquid. The coagulation and sedimentation unit includes a coagulation tank, a magnetic mixing tank, a flocculation tank, and a clarification tank according to the liquid processing sequence. The oxidation breaking tank and the coagulation tank are adjacent, and the liquid flows between the coagulation tank, the magnetic mixing tank, the flocculation tank, and the clarification tank. The magnetic powder recovery unit includes a sludge treatment component and a reflux component, used to recycle or process and discharge the sludge.

[0006] Furthermore, a control component is fixedly installed on one side of the outer casing assembly. The control component includes a controller, with a connecting plate connected to its top. The connecting plate is fixedly installed on the top of the outer casing assembly. A breaker cylinder for storing the breaker is fixedly installed on the top of the connecting plate, away from the controller. An electric ball valve for controlling the outflow of the breaker is fixedly installed on the outlet of the breaker cylinder. The electric ball valve is electrically connected to the controller. This electrical connection allows the controller to control the start and stop of the electric ball valve, improving the intelligence of the fracturing flowback fluid high-efficiency pretreatment equipment.

[0007] Furthermore, the sludge treatment assembly includes a connecting pipe assembly inserted into the bottom of the clarification tank. This assembly comprises multiple connecting pipes, all connected by flange seals. A sludge pump is sealed to each connecting pipe and electrically connected to the controller. The connecting pipe at the sludge pump outlet is located within the magnetic mixing tank. This location of the sludge pump outlet within the magnetic mixing tank allows for the recycling of the pumped sludge, enhancing the comprehensiveness of the fracturing flowback fluid pretreatment equipment for sludge cleaning.

[0008] Furthermore, a high-speed shear and a magnetic separator are fixedly installed on the connecting pipe at the sludge pump outlet. The magnetic separator is located above the high-speed shear, and a sludge discharge pipe for discharging sludge is sealed on one side of the magnetic separator. Both the high-speed shear and the magnetic separator are electrically connected to the controller.

[0009] Furthermore, a mounting plate is fixedly installed on the side of the housing assembly away from the controller. A water pump is mounted on the top of the mounting plate. The water pump is electrically connected to the controller. A suction pipe is fixedly connected to the pump's suction end, which is located inside the oxidation breaking tank. The pump's outlet suction pipe is located inside the coagulation tank. The pump's outlet suction pipe being located inside the coagulation tank allows the pump to transfer liquid between the coagulation tank and the oxidation breaking tank, improving the efficiency of the fracturing flowback fluid pretreatment equipment for pretreatment of fracturing flowback fluid.

[0010] Furthermore, the outer shell assembly has a mounting bracket fixedly installed on the top of the flocculation tank, a motor is fixedly installed at the center of the top of the mounting bracket, the output end of the motor is fixedly connected to a rotating shaft, the rotating shaft is located inside the flocculation tank, and multiple stirring blades for liquid stirring are fixedly installed on the rotating shaft.

[0011] Furthermore, the stirring plate is provided with multiple convection grooves for liquid convection. Beneficial effects

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention reduces the viscosity of fracturing flowback fluid by setting an oxidation breaking tank at the front end of the coagulation tank. This allows for the rapid breaking of residual glue in the water that has not been fully broken down, reducing the encapsulation of suspended solids and colloids in the water, improving the coagulation and sedimentation reaction effect, ensuring a significant reduction in the concentration of suspended solids in the effluent, and enhancing the sedimentation effect of the high-efficiency pretreatment equipment for fracturing flowback fluid on fine particles. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a high-efficiency pretreatment device for fracturing flowback fluid according to the present invention;

[0015] Figure 2 This is a schematic diagram of the right rear view of a high-efficiency pretreatment device for fracturing flowback fluid according to the present invention;

[0016] Figure 3 This is a partially enlarged three-dimensional structural diagram of A of this utility model;

[0017] Figure 4 This is a partially enlarged three-dimensional structural diagram of utility model B.

[0018] Figure 5 This is a three-dimensional structural diagram of the control component of this utility model;

[0019] Figure 6 This is a three-dimensional structural diagram of the stirring assembly of this utility model.

[0020] In the diagram: 1. Outer shell assembly; 2. Sludge treatment assembly; 3. Mixing assembly; 4. Clarification tank; 5. Flocculation tank; 6. Magnetic mixing tank; 7. Coagulation tank; 8. Oxidation breaking tank; 9. Control assembly; 10. Return assembly; 21. Sludge pump; 22. High-speed shear machine; 23. Sludge delivery pipe; 24. Magnetic separator; 25. Connecting pipe assembly; 11. Liquid extraction pipe; 12. Water pump; 13. Mounting plate; 91. Controller; 92. Connecting plate; 93. Electric ball valve; 94. Breaker cylinder; 31. Motor; 32. Mounting bracket; 33. Rotating shaft; 34. Convection tank; 35. Mixing blade. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0022] Example

[0023] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6This application provides a further detailed description. A high-efficiency pretreatment device for fracturing flowback fluid includes a shell assembly 1. The shell assembly 1 is divided into an oxidation breaking unit, a coagulation and sedimentation unit, and a magnetic powder recovery unit according to the liquid processing sequence. The oxidation breaking unit includes an oxidation breaking tank 8 located at the front end of the shell assembly 1, which is used to reduce the viscosity of the liquid. The coagulation and sedimentation unit includes a coagulation tank 7, a magnetic mixing tank 6, a flocculation tank 5, and a clarification tank 4 according to the liquid processing sequence. The oxidation breaking tank 8 and the coagulation tank 7 are adjacent, and the liquid flows between the coagulation tank 7, the magnetic mixing tank 6, the flocculation tank 5, and the clarification tank 4. The magnetic powder recovery unit includes a sludge treatment component 2 and a return component 10. Component 2 and return assembly 10 are used for recycling or discharging sludge. A control assembly 9 is fixedly installed on one side of the outer casing assembly 1. The control assembly 9 includes a controller 91, with a connecting plate 92 connected to the top of the controller 91. The connecting plate 92 is fixedly installed on the top of the outer casing assembly 1. A breaker cylinder 94 for storing breaker is fixedly installed on the top of the side of the connecting plate 92 away from the controller 91. An electric ball valve 93 for controlling the outflow of breaker is fixedly installed on the outlet of the breaker cylinder 94. The electric ball valve 93 is electrically connected to the controller 91. The sludge treatment assembly 2 includes a connecting pipe assembly 25 inserted into the bottom of the clarification tank 4. 5 includes multiple connecting pipes, all connected by flange seals. A sludge pump 21 is sealed to each connecting pipe. The sludge pump 21 is electrically connected to the controller 91. The connecting pipe at the sludge outlet of the sludge pump 21 is located inside the magnetic mixing tank 6. A high-speed shear machine 22 and a magnetic separator 24 are fixedly installed on the connecting pipe at the sludge outlet of the sludge pump 21. The magnetic separator 24 is located above the high-speed shear machine 22. A sludge discharge pipe 23 is sealed to one side of the magnetic separator 24. Both the high-speed shear machine 22 and the magnetic separator 24 are electrically connected to the controller 91. A mounting plate 13 is fixedly installed on the side of the housing assembly 1 away from the controller 91. A water pump 12 is installed on the top of the mounting plate 13. The water pump 12 is electrically connected to the controller 91. The water pump 12 is fixedly connected to the water suction end with a liquid suction pipe 11. The liquid suction pipe 11 is located in the oxidation breaking tank 8. The water pump 12 is located in the coagulation tank 7 with the water discharge end of the liquid suction pipe. The outer shell assembly 1 is fixedly installed with a mounting frame 32 on the top of the flocculation tank 5. A motor 31 is fixedly installed at the center of the top of the mounting frame 32. The output end of the motor 31 is fixedly connected to a rotating shaft 33. The rotating shaft 33 is located in the flocculation tank 5. Multiple stirring blades 35 for liquid stirring are fixedly installed on the rotating shaft 33. Multiple convection grooves 34 for liquid convection are opened on the stirring blades 35.

[0024] The working principle of the controller 91 can be divided into four basic steps: input, processing, output, and feedback. First, the controller 91 receives input signals from external devices or users, such as button presses or information detected by sensors. Next, the controller 91 processes the input signals, performs calculations and judgments according to the set algorithms and logic, and then generates corresponding output signals based on the processing results to control the working status and display information of external devices.

[0025] The working principle of the electric ball valve 93 is to control the flow or blockage of the medium by rotating the ball. When the ball is aligned with the valve seat, a channel is formed, and the medium can pass freely through the ball valve. When the ball rotates perpendicular to the valve seat, the fluid channel is closed, achieving a sealed state. The opening and closing element of the ball valve is a ball with a circular channel that rotates around an axis perpendicular to the channel. It only requires a 90-degree rotation and a very small torque to achieve a tight seal, and the rotation of the ball is controlled by the controller 91.

[0026] Among these, the system addresses the issue of efficient removal of suspended solids and colloids from fracturing flowback fluids. Compared to traditional coagulation and sedimentation processes, this system offers the following advantages: Faster settling speed: Adding magnetic powder (4.8-5.1 specific gravity) to conventional coagulation and sedimentation processes allows the magnetic powder to bind with the flocs, increasing their specific gravity and significantly accelerating their settling speed, thus improving treatment efficiency. Thorough removal of suspended solids: Before coagulation and sedimentation, a breaker is added to reduce water viscosity, rapidly breaking down any remaining colloids and reducing their encapsulation of suspended solids and colloids, thereby enhancing the coagulation and sedimentation reaction. Effectiveness: Ensures a significant reduction in effluent suspended solids concentration (suspended solids removal rate of over 95%, effluent suspended solids concentration ≤20mg / L), meeting subsequent treatment requirements; Reduced chemical reagent usage: The added magnetic powder heavy medium has a large specific surface area, which can increase coagulation and sedimentation effects through physical-chemical synergy, reducing the amount of coagulants and flocculants used, saving costs and reducing secondary pollution; High-efficiency magnetic recovery system: The magnetic powder is mainly composed of Fe3O4, arranged in a disordered manner. The magnetic powder itself is not magnetic, but it can conduct magnetism and can be recovered by a magnetic recovery system with a recovery rate of over 99%. In addition, other chemical properties are stable and will not dissolve in water or undergo other reactions; Compact and adaptable equipment: Modular design, small footprint (compared to 1 / 3 of traditional coagulation and sedimentation equipment), adaptable to different water quality fluctuations, suitable for rapid deployment on-site for fracturing flowback fluid treatment.

[0027] The high-speed shearing machine 22 operates primarily by using a high-speed rotating rotor to generate powerful centrifugal force, drawing material into the rotor zone. Within this zone, the material undergoes intense shearing, compression, friction, and impact, rapidly achieving homogenization, emulsification, and dispersion. Specifically, the rotor throws the material into the shearing gap between the stator and rotor; after undergoing high-level shearing, the material further enters the mixing tank to participate in the overall circulation. This equipment is widely used in the food, cosmetics, and pharmaceutical industries to achieve efficient material handling and mixing.

[0028] Among them, the breaker cylinder 94 can continuously pour the breaker into the oxidation breaker tank 8, and the motor 31 can directly stir the coagulation tank 7, which speeds up the efficiency of the fracturing flowback fluid pretreatment equipment for fracturing flowback fluid pretreatment.

[0029] The working principle of the magnetic separator 24 is based on the attraction of the magnetic field to magnetic materials. After the material enters the separator, the magnetic material will be attracted by the magnetic force and adhere to the surface of the magnetic source, so that the magnetic separator 24 can effectively separate the magnetic material.

[0030] The working principle of this utility model is explained below: The high-efficiency pretreatment equipment for fracturing flowback fluid mainly comprises three units: an oxidation and de-gelling unit, a coagulation and sedimentation unit, and a magnetic powder recovery unit. In the oxidation and de-gelling unit, fracturing flowback fluid enters this unit, and a de-gelling agent is added to rapidly oxidize and de-gelatinize the residual colloids in the water, further reducing the viscosity of the wastewater and improving the subsequent coagulation and sedimentation effect. The coagulation and sedimentation unit includes four reaction tanks: a coagulation tank 7, a magnetic mixing tank 6, a flocculation tank 5, and a clarification tank 4. The wastewater after oxidation and de-gelling first enters the coagulation tank 7, where coagulant PAC is added. After thorough mixing, the wastewater enters the magnetic mixing tank 6, where it is mixed and flocculated with recovered magnetic powder and returned sludge. Then, it enters the flocculation tank 5, where it is mixed with flocculant PAM. The reaction generates larger flocculent particles, which then enter the clarifier 4 for rapid settling. The effluent then proceeds to the next treatment stage or is discharged directly after meeting standards. In the magnetic powder recovery unit, some of the sludge settled in the clarifier is returned to the magnetic mixing tank via a magnetic sludge return pump to continue the reaction, while the other part undergoes magnetic sludge stripping via a high-shear machine 22 and is then fed into a magnetic separator 24 for magnetic powder recovery. The recovered magnetic powder re-enters the magnetic mixing tank 6 to continue the reaction. The remaining sludge enters the subsequent sludge treatment system. PAC and PAM solutions prepared in the dosing room are pumped to various dosing points. PAC is added to the coagulation tank 7, and PAM is added to the flocculation tank 6. Through the coordination between these tanks, the high-efficiency pretreatment equipment for fracturing flowback fluid improves the coagulation and sedimentation reaction effect, ensuring a significant reduction in the concentration of suspended solids in the effluent and enhancing the settling effect of the equipment on fine particles.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A high-efficiency pretreatment device for fracturing flowback fluid, characterized in that, The system includes an outer shell assembly (1), which is divided into an oxidation breaking unit, a coagulation sedimentation unit and a magnetic powder recovery unit according to the liquid processing sequence. The oxidation breaking unit includes an oxidation breaking tank (8) located at the front end of the outer shell assembly (1). The oxidation breaking tank (8) is used to reduce the viscosity of the liquid. The coagulation sedimentation unit includes a coagulation tank (7), a magnetic mixing tank (6), a flocculation tank (5) and a clarification tank (4) according to the liquid processing sequence. The oxidation breaking tank (8) and the coagulation tank (7) are adjacent to each other. The liquid flows between the coagulation tank (7), the magnetic mixing tank (6), the flocculation tank (5) and the clarification tank (4). The magnetic powder recovery unit includes a sludge treatment assembly (2) and a return assembly (10). The sludge treatment assembly (2) and the return assembly (10) are used to recycle or process and discharge the sludge.

2. The high-efficiency pretreatment equipment for fracturing flowback fluid according to claim 1, characterized in that: A control component (9) is fixedly installed on one side of the outer casing assembly (1). The control component (9) includes a controller (91). A connecting plate (92) is connected to the top of the controller (91). The connecting plate (92) is fixedly installed on the top of the outer casing assembly (1). A de-demolition agent cylinder (94) for storing de-demolition agent is fixedly installed on the top of the side of the connecting plate (92) away from the controller (91). An electric ball valve (93) for controlling the outflow of de-demolition agent is fixedly installed on the outlet of the de-demolition agent cylinder (94). The electric ball valve (93) is electrically connected to the controller (91).

3. The high-efficiency pretreatment equipment for fracturing flowback fluid according to claim 2, characterized in that: The sludge treatment assembly (2) includes a connecting pipe assembly (25) inserted into the bottom of the clarification tank (4). The connecting pipe assembly (25) includes multiple connecting pipes, which are connected by flange sealing. A sludge pump (21) is sealed to the connecting pipe. The sludge pump (21) is electrically connected to the controller (91). The connecting pipe at the sludge outlet of the sludge pump (21) is located in the magnetic mixing tank (6).

4. The high-efficiency pretreatment equipment for fracturing flowback fluid according to claim 3, characterized in that: A high-speed shearing machine (22) and a magnetic separator (24) are fixedly installed on the connecting pipe at the sludge outlet end of the sludge pump (21). The magnetic separator (24) is located at the upper end of the high-speed shearing machine (22). A sludge discharge pipe (23) for discharging sludge is sealed on one side of the magnetic separator (24). Both the high-speed shearing machine (22) and the magnetic separator (24) are electrically connected to the controller (91).

5. The high-efficiency pretreatment equipment for fracturing flowback fluid according to claim 2, characterized in that: An installation plate (13) is fixedly installed on the side of the outer casing assembly (1) away from the controller (91). A water pump (12) is provided on the top of the installation plate (13). The water pump (12) is electrically connected to the controller (91). A liquid extraction pipe (11) is fixedly connected to the water pump (12). The liquid extraction pipe (11) is located in the oxidation breaking tank (8). The liquid extraction pipe at the water outlet of the water pump (12) is located in the coagulation tank (7).

6. The high-efficiency pretreatment equipment for fracturing flowback fluid according to claim 1, characterized in that: The outer shell assembly (1) has a mounting bracket (32) fixedly installed on the top of the flocculation tank (5). A motor (31) is fixedly installed at the center of the top of the mounting bracket (32). The output end of the motor (31) is fixedly connected to a rotating shaft (33). The rotating shaft (33) is located inside the flocculation tank (5). Multiple stirring blades (35) for liquid stirring are fixedly installed on the rotating shaft (33).

7. The high-efficiency pretreatment equipment for fracturing flowback fluid according to claim 6, characterized in that: The stirring plate (35) has multiple convection channels (34) for liquid convection.

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