A skid-mounted fracturing fluid mixing device

Abstract

The utility model provides a kind of skid-mounted fracturing fluid mixing device, it is related to fracturing fluid mixing technical field, technical solutions are as follows: including mixing tank, mixer and water storage tank, the first outlet of water storage tank is connected with mixer, the outlet of mixer is connected with mixing tank by discharge pipe;Mixing tank is connected with feed pipe and liquid inlet pipe, and grating is arranged in mixer.The beneficial effects of the technical solution are: by setting airflow equalization dispersing, grating equal division settling and multi-stage filter screen intercepting collection structure inside mixer, realize that powdery material and liquid material are dispersed by airflow blowing before entering mixing tank, wetted and dissolved layer by layer, effectively avoid the problem that guanidium gum and high molecular thickening powder meet water instant clump, outer hydration internal inclusion dry core, substantially reduce the generation of fish eye and colloid.

Description

Technical Field

[0001] This utility model relates to the field of fracturing fluid mixing technology, and in particular to a skid-mounted fracturing fluid mixing device. Background Technology

[0002] Skid-mounted fracturing fluid systems are integrated, easily movable, and installable fracturing fluid treatment devices, primarily used for fracturing operations during oil and gas field exploration and development. The materials required for fracturing fluid mixing include three categories: liquid materials, powdered materials, and solid particulate materials. Liquid materials mainly consist of formation base fluids such as water and brine, as well as various liquid chemical additives such as clay stabilizers, bactericides, drainage aids, corrosion inhibitors, and liquid crosslinking agents. Powdered materials mainly consist of high-molecular-weight thickeners such as guar gum and hydroxypropyl guar gum, solid breaker agents, and inorganic salt powders. In addition, hard particulate proppant such as quartz sand and ceramsite are added to complete the fracturing fluid mixing process.

[0003] Currently, conventional skid-mounted fracturing fluid preparation processes typically involve premixing powdered materials and liquids externally before transferring them to a mixing tank for further mixing. Most existing skid-mounted systems use simple pipeline manifolds, directly channeling water, dry powder, and various reagents into the mixer. This results in a limited premixing method and insufficient jet wetting efficiency.

[0004] Dry powder materials cannot be pre-dispersed and fully wetted within the delivery pipeline and must be directly introduced into the mixing or shearing chamber. This is especially true for guar gum and polymeric thickeners, which readily agglomerate upon contact with water, resulting in rapid outer hydration and a dry core remaining inside, leading to numerous fish-eye and agglomerated clumps. Even with prolonged subsequent mixing, these clumps are difficult to completely dissolve, ultimately causing the prepared fracturing fluid to fail to meet viscosity standards, resulting in poor overall gel stability and significantly reducing the fracturing fluid's proppant-carrying capacity and on-site operational effectiveness. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of current dry powder materials, which cannot be fully mixed during premixing, resulting in fish-eye and agglomerated clumps that affect the effect of fracturing fluid in the later stage. Therefore, a skid-mounted fracturing fluid mixing device is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A skid-mounted fracturing fluid mixing device includes a mixing tank, a mixer, and a water storage tank. The first outlet of the water storage tank is connected to the mixer, and the outlet of the mixer is connected to the mixing tank via a discharge pipe. The mixer is connected to a feed pipe and a liquid inlet pipe. A grid is installed inside the mixer, and the outlets of the feed pipe and the liquid inlet pipe are located above the grid. The grid is inclined. A pressure equalization box is installed on the side wall inside the mixer, and the pressure equalization box is correspondingly arranged with the grid. Two opposite side walls inside the mixer are connected to a connecting frame, which is located below the grid. A first filter screen is installed on the connecting frame, and a blocking component is installed on the connecting frame.

[0008] Preferably, two first baffles are fixed at the top inside the mixer, the grid is located between the two first baffles, and the width of the connecting frame is greater than the distance between the two first baffles.

[0009] Preferably, the blocking assembly includes second baffles disposed on both sides of the upper surface of the connecting frame. The connecting frame is inclined, and two connectors are fixed below the connecting frame along the inclined direction. The two connectors are respectively fixed on the two second baffles, and a second filter screen is connected between the two connectors. The length of the second filter screen is greater than the width of the first filter screen.

[0010] Preferably, a fixed pipe is connected to the side wall of the mixer. The fixed pipe is located below the pressure equalization box. Multiple nozzles are evenly spaced on the fixed pipe, and the nozzles are correspondingly arranged with the second filter screen on the connecting frame.

[0011] Preferably, the two side walls inside the mixer are connected to a partition, the upper end of the partition is connected to the top inside the mixer, and a first conveying pipe is connected to the side wall of the mixer. The first conveying pipe and the partition are arranged accordingly.

[0012] Preferably, a plurality of air outlet groups are provided at equal intervals on the side wall of the pressure equalization box. The air outlet group includes a transverse elongated oval hole located on the upper part of the side wall of the pressure equalization box and an array of vertical elongated oval holes located on the lower part of the side wall of the pressure equalization box. The length direction of the transverse elongated oval holes is arranged along the horizontal direction of the pressure equalization box, and the length direction of the vertical elongated oval holes extends along the height direction of the pressure equalization box.

[0013] Preferably, a second conveying pipe is connected between the water storage tank and the mixing tank, a connecting pipe is connected to the second conveying pipe, the connecting pipe is connected to the fixed pipe, a first valve is provided on the connecting pipe, a second valve is connected to the second conveying pipe, a liquid outlet pipe is connected to the bottom of the mixer, a discharge pipe is connected to the liquid outlet pipe, and a third valve is provided on the discharge pipe.

[0014] Preferably, a liquid level sensor is provided on the side wall of the mixer.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting up an airflow pressure equalization and dispersion, grid equalization and sedimentation, and multi-stage filter interception and collection structure inside the mixer, the powdered materials and liquid materials are first dispersed by airflow and gradually wetted and dissolved before entering the mixing tank. This effectively avoids the problem of guar gum and polymer thickening powders instantly agglomerating when they come into contact with water, and the problem of outer layer hydration and inner dry core. It also significantly reduces the generation of fish eyes and clumps. At the same time, the inclined filter screen collects the agglomerates by its own weight and is combined with spray flushing to achieve secondary dissolution and remixing of clumps. This significantly improves the premixing uniformity and wetting effect of powder and liquid, ensures that the overall viscosity of the fracturing fluid is stable and meets the standard, and effectively enhances the gelation performance and sand carrying capacity. It eliminates the need for long-term shearing and stirring in the mixing tank. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating a specific embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of the mixer in a specific embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure inside the mixer in a specific embodiment of this utility model.

[0020] Figure 4 This is an exploded view of the first baffle and grille in a specific embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the equalizing box in a specific embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the connecting frame in a specific embodiment of the present utility model.

[0023] In the diagram: 1. Mixing tank; 2. Discharge pipe; 3. First conveying pipe; 4. Water storage tank; 5. Blower; 6. Mixer; 7. Second conveying pipe; 8. Baffle; 9. Feed pipe; 10. Liquid inlet pipe; 11. Pressure equalization box; 12. Liquid level sensor; 13. Grille; 14. Connecting frame; 15. Liquid outlet pipe; 16. First baffle; 17. Gas supply pipe; 18. Fixed pipe; 19. Nozzle; 20. Connector; 21. Second baffle; 22. First filter screen; 23. Second filter screen; 24. Air outlet assembly. Detailed Implementation

[0024] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. 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.

[0025] Reference Figures 1-6 A skid-mounted fracturing fluid mixing device includes a mixing tank 1, a mixer 6, and a water storage tank 4. The first outlet of the water storage tank 4 is connected to the mixer 6. An observation window is provided on the side wall of the mixer 6 to observe the position of the solution inside the mixer 6 at any time. An exhaust port is provided on the top of the mixer 6, and dust-blocking cotton is provided in the exhaust port. The exhaust port is located between a partition 8 and a grid 13. The bottom of the mixer 6 is inclined to actively guide the sand-containing high-density fracturing fluid to the outlet pipe 15 port using gravity, ensuring that the solution inside the mixer 6 can be completely emptied and without residue. The outlet of the mixer 6 is connected to the outlet pipe 15. The feed pipe 2 is connected to the mixing tank 1. A liquid level sensor 12 is installed on the side wall of the mixer 6. The liquid level sensor 12 is located below the fixed pipe 18, and its height is higher than that of the connector 20. This allows the solution to soak any agglomerates. The mixer 6 is connected to the material outlet. According to the material sequence, the powdered additive is first fed into the mixer 6, mixed with water, and then fed into the mixing tank 1. A second conveying pipe 7 connects the water storage tank 4 and the mixing tank 1. A water pump is installed on the second conveying pipe 7, and a connecting pipe is connected to the second conveying pipe 7. The connecting pipe is connected to the fixed pipe 18, and a first valve is installed on the connecting pipe. A second valve is connected to the second conveying pipe 7. The bottom of the mixer 6 is connected to the liquid outlet pipe 15, and the liquid outlet pipe 15 is connected to the discharge pipe 2. A third valve is installed on the discharge pipe 2. The mixer also includes a blower 5, which is connected to the equalizing box 11 via an air supply pipe 17. An air dryer is installed inside the blower 5 to ensure that the conveyed air is dry and clean. The first, second, third, and fourth valves are all electric valves. Flow meters are installed on both the second conveying pipe 7 and the first conveying pipe 3 to measure the amount of clean water conveyed. Initially, the water storage tank 4 supplies a portion of water to the mixing tank 1 through the second conveying pipe 7. Then, the water storage tank 4 supplies water to the mixer 6 through the first conveying pipe 3. After all the powder and liquid are mixed, they are all transported to the mixing tank 1. The remaining water is then transported through the second conveying pipe 7 again. The opening and closing of the first valve allows the connecting pipe to divert the flow to the fixed pipe 18, providing flushing medium for the nozzle 19. The fracturing fluid that has been premixed in the mixer 6 flows from the bottom outlet pipe 15 into the discharge pipe 2. The flow rate is controlled by the third valve, and the fluid is quantitatively transported to the mixing tank 1 for secondary mixing and preparation. The mixer 6 is connected to a feed pipe 9 and a liquid inlet pipe 10. The liquid inlet pipe 10 is connected to the first conveying pipe 3, and a fourth valve is connected between the first conveying pipe 3 and the liquid inlet pipe 10. After conveying the liquid and powder, the fourth valve is opened, and the first conveying pipe 3 conveys water into the liquid inlet pipe 10. The water washes the sides of the grid 13 and the partition plate 8. The feed pipe 9 and the liquid inlet pipe 10 are connected to the outlets of the corresponding materials. The mixer 6 is equipped with a grid 13, and the outlets of the feed pipe 9 and the liquid inlet pipe 10 are located above the grid 13. The grid 13 is inclined. A pressure equalization box 11 is installed on the side wall of the mixer 6. The pressure equalization box 11 is corresponding to the grid 13. The air pressure of the pressure equalization box 11 is adjusted according to the liquid or powder. When the material falls downward, the pressure equalization box 11 starts to supply air. The high-pressure gas forms an airflow disturbance inside the mixer 6, which blows and disperses the incoming powder and liquid materials. Powder and liquid pass through grid 13 and settle evenly downwards under the uniform flow distribution of grid 13. Water tank 4 continuously supplies water to mixer 6. Water and the pre-entered blending liquid are fully mixed and blended in the cavity to form a liquid phase mixture medium. Two opposite side walls inside mixer 6 are connected to a connecting frame 14. The connecting frame 14 is located below grid 13. A first filter screen 22 is installed on the connecting frame 14. A blocking component is installed on the connecting frame 14. During the material mixing process, a small amount of damp, agglomerated, and incompletely dispersed powder clumps cannot descend with the air and liquid flow and will remain and settle above the first filter screen 22. The first filter screen 22 intercepts and blocks the powder, preventing agglomerated powder from directly entering the subsequent process flow and ensuring that the initial mixing ratio of fracturing fluid is uniform and stable. The tilt angle of the connecting frame 14 is smaller than that of the grid 13. The blocking component blocks the clumps and prevents them from falling into the solution below.

[0026] Reference Figures 2-4 Two first baffles 16 are fixed at the top inside the mixer 6. The two first baffles 16 laterally limit and guide the powder and liquid materials falling from the feed pipe 9 and liquid inlet pipe 10. The grid 13 is located between the two first baffles 16. The width of the connecting frame 14 is greater than the distance between the two first baffles 16. The first baffles 16 concentrate the material falling area, preventing the powder and liquid from scattering to the side wall of the mixer 6 and improving the material distribution and utilization rate of the grid 13. The setting of the connecting frame 14 ensures that all falling materials can fall into the interception area of ​​the first filter screen 22, preventing undispersed and clumped materials from escaping from the side and ensuring the integrity of filtration and interception.

[0027] Reference Figures 2-4The pressure equalization box 11 has multiple air outlet groups 24 evenly spaced on its side wall. Each air outlet group 24 includes a transverse elongated oval hole located at the upper part of the side wall of the pressure equalization box 11 and an array of vertical elongated oval holes located at the lower part of the side wall. The transverse elongated oval holes extend horizontally along the pressure equalization box 11, while the vertical elongated oval holes extend vertically along the height of the pressure equalization box 11. The upper transverse elongated oval holes discharge air horizontally, sweeping and spreading the powder falling from the grid 13, dispersing the dust to prevent it from piling up in the middle or accumulating locally. The lower vertical elongated oval holes discharge air horizontally, sweeping and spreading the powder falling from the grid 13, preventing it from piling up in the middle or accumulating locally. The array of circular holes delivers air vertically, creating a longitudinal airflow. This longitudinal airflow applies a continuous and uniform horizontal damping effect to the falling powder, effectively extending the residence time of the powder in the aerodynamic zone. This prevents the powder from passing through the mixing area before it has fully diffused due to excessive acceleration caused by gravity. The combined horizontal and vertical elongated hole air outlet structure creates a three-dimensional airflow field, resulting in a more uniform and thorough dispersion effect compared to a single air outlet method. The horizontal air outlet disperses the material, while the vertical air outlet provides horizontal damping, preventing localized powder accumulation and ensuring more thorough contact between the powder and liquids / water, significantly improving the mixing uniformity of the fracturing fluid.

[0028] Reference Figure 3 and Figure 6 The blocking component includes second baffles 21 disposed on both sides of the upper surface of the connecting frame 14. The connecting frame 14 is inclined, and the second baffles 21 on both sides of its upper surface form a barrier structure to prevent materials from sliding down from both sides. The connecting frame 14 is inclined, and two connectors 20 are fixed to the lower part of the connecting frame 14 along the inclined direction. The two connectors 20 are respectively fixed to the two second baffles 21. A second filter screen 23 is connected between the two connectors 20. The length of the second filter screen 23 is greater than the width of the first filter screen 22. The inclined structure causes the powder agglomerates falling on the first filter screen 22 to slide down the slope and be screened again by the second filter screen 23 set up by the connectors 20. The length of the second filter screen 23 is greater than the width of the first filter screen 22. The mesh 22 is wide enough to completely catch all the clumps of material that slide down, achieving secondary interception and grading. A fixed pipe 18 is connected to the side wall of the mixer 6. The fixed pipe 18 is located below the pressure equalization box 11. Multiple nozzles 19 are evenly spaced on the fixed pipe 18. The nozzles 19 are correspondingly set with the second filter screen 23 on the connecting frame 14. The multiple nozzles 19 are directionally sprayed onto the surface of the second filter screen 23 to flush and dissolve the powder clumps intercepted on the second filter screen 23. At the same time, the mesh of the second filter screen 23 is flushed and unblocked, realizing the reuse of clumps. The real-time flushing of the filter screen mesh effectively prevents powder from adhering and clogging the filter screen, ensuring long-term permeability of the filter screen and continuously stabilizing the material screening and mixing efficiency.

[0029] Reference Figure 2 and Figure 3The two side walls inside the mixer 6 are connected to a baffle 8. The upper end of the baffle 8 is connected to the top inside the mixer 6. A first delivery pipe 3 is connected to the side wall of the mixer 6. The first delivery pipe 3 and the baffle 8 are arranged accordingly. The vertical baffle 8 divides the inside of the mixer 6 into independent cavity spaces to avoid the airflow and the liquid flow delivered by the first delivery pipe 3 from intermingling and to regulate the flow field distribution inside the mixer 6.

[0030] During equipment operation, the water storage tank 4 delivers process water to the mixer 6 through the first conveying pipe 3. At the same time, the fourth valve and the third valve on the discharge pipe 2 are closed, and the first valve on the connecting pipe and the second valve on the second conveying pipe 7 are closed, so that the water accumulates in the mixer 6. When the water level in the mixer 6 reaches the liquid level sensor 12, the solution exceeds the height of the connecting part 20, and then the powder material is conveyed to the mixer 6 through the feed pipe 9.

[0031] As the powder material falls from top to bottom, the blower 5 continuously delivers high-pressure gas to the equalizing box 11. The airflow sweeps and disperses the falling powder. After being dispersed, the powder is evenly distributed by the grid 13 and settles into the lower solution. At the same time, the first conveying pipe 3 continuously replenishes water to maintain the liquid level and mixing conditions in the mixer 6.

[0032] While water is continuously being transported through the first conveying pipe 3, the third valve on the discharge pipe 2 is opened simultaneously. While water is being introduced, the solution is being discharged to ensure that the liquid level in the mixer 6 remains constant. The mixed fracturing fluid solution is then transported through the discharge pipe 2 to the mixing tank 1 for further mixing and preparation. The subsequent powder is then mixed with the water transported later under the action of the equalizing box 11.

[0033] During the entire material mixing process, a small amount of damp, clumped powder clumps that were not completely dispersed by the airflow could not move down normally with the airflow and liquid flow, and gradually remained and settled on the upper surface of the first filter screen 22, and were soaked in the solution; after the powder material was conveyed, the first conveying pipe 3 was closed to stop the water supply. At the same time, the third valve on the discharge pipe 2 is continuously opened to drain and depressurize. The powder clumps retained on the filter screen 22 and the connecting frame 14 are automatically slid and collected along the slope by using the inclined slope of the first filter screen 22. After the liquid level inside the mixer 6 drops below the connecting frame 14, that is, the liquid level is below the connecting part 20, the third valve is closed to ensure that there is some solution at the bottom of the mixer 6.

[0034] At this point, the powder clumps remaining on the first filter screen 22 slide down due to the weight of the inclined slope and are blocked by the second baffles 21 and the second filter screen 23 on both sides, and are collected in the designated area. Then, the first valve on the connecting pipe is opened, and each nozzle 19 on the fixed pipe 18 sprays water in a directional manner towards the bottom of the connecting frame 14. The high-pressure water flow washes and dissolves the collected powder clumps, so that the dispersed powder falls back into the corresponding solution at the bottom with the water flow and participates in the mixing. The washed-off powder clumps remain on the surface of the first filter screen 22, which avoids powder agglomeration and waste, and also ensures that the overall fracturing fluid ratio is uniform. After the agglomeration is dealt with, the third valve on the discharge pipe 2 is opened, and the solution is discharged through the discharge pipe 2. When transporting other materials, the previous steps are followed. When transporting liquid materials, the liquid is transported through the liquid inlet pipe 10. Before delivering the liquid, some water is first delivered through the first delivery pipe 3, and then the liquid is delivered through the inlet pipe 10, repeating the previous steps. After the liquid is delivered, the fourth valve is opened, and water is delivered to the inlet pipe 10 through the first delivery pipe 3. Under the action of the wind in the equalization box 11, the water washes the side of the partition 8, causing the liquid adhering to the partition 8 to fall off. Then, the wind force of the equalization box 11 is reduced or the equalization box 11 is closed, and the upper surface of the grid 13 is washed. Then, the cleaning solution is delivered to the mixing tank 1 again. Then, the corresponding solid raw materials are delivered to the mixing tank 1 in the corresponding order. The second valve on the second delivery pipe 7 is opened, and the first valve on the connecting pipe is closed. The second delivery pipe 7 delivers the remaining water to the mixing tank 1. After the delivery is completed, the mixing tank 1 starts to stir, mixing and stirring the remaining materials.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. 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 the present invention. Therefore, the present invention 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 skid-mounted fracturing fluid mixing device, characterized in that: The mixer includes a mixing tank (1), a mixer (6), and a water storage tank (4). The first outlet of the water storage tank (4) is connected to the mixer (6), and the outlet of the mixer (6) is connected to the mixing tank (1) through a discharge pipe (2). The mixer (6) is connected to a feed pipe (9) and a liquid inlet pipe (10). A grid (13) is provided inside the mixer (6). The outlets of the feed pipe (9) and the liquid inlet pipe (10) are located above the grid (13). The grid (13) is inclined. A pressure equalization box (11) is provided on the side wall inside the mixer (6). The pressure equalization box (11) is correspondingly provided to the grid (13). Two opposite side walls inside the mixer (6) are connected to a connecting frame (14). The connecting frame (14) is located below the grid (13). A first filter screen (22) is provided on the connecting frame (14). A blocking component is provided on the connecting frame (14).

2. The skid-mounted fracturing fluid mixing device according to claim 1, characterized in that: Two first baffles (16) are fixed at the top inside the mixer (6), and the grid (13) is located between the two first baffles (16). The width of the connecting frame (14) is greater than the distance between the two first baffles (16).

3. The skid-mounted fracturing fluid mixing device according to claim 1, characterized in that: The blocking assembly includes a second baffle (21) disposed on both sides of the upper surface of the connecting frame (14). The connecting frame (14) is inclined. Two connectors (20) are fixed below the connecting frame (14) along the inclined direction. The two connectors (20) are respectively fixed on the two second baffles (21). A second filter screen (23) is connected between the two connectors (20). The length of the second filter screen (23) is greater than the width of the first filter screen (22).

4. The skid-mounted fracturing fluid mixing device according to claim 3, characterized in that: The side wall inside the mixer (6) is connected to a fixed pipe (18), which is located below the equalizing box (11). Multiple nozzles (19) are evenly spaced on the fixed pipe (18), and the nozzles (19) are correspondingly set with the second filter screen (23) on the connecting frame (14).

5. The skid-mounted fracturing fluid mixing device according to claim 1, characterized in that: The two side walls inside the mixer (6) are connected to a partition (8). The upper end of the partition (8) is connected to the top inside the mixer (6). A first conveying pipe (3) is connected to the side wall of the mixer (6). The first conveying pipe (3) and the partition (8) are arranged accordingly.

6. The skid-mounted fracturing fluid mixing device according to claim 1, characterized in that: Multiple air outlet groups (24) are provided at equal intervals on the side wall of the pressure equalization box (11). The air outlet group (24) includes a horizontal elongated hole located on the upper part of the side wall of the pressure equalization box (11) and a vertical elongated hole array located on the lower part of the side wall of the pressure equalization box (11). The length direction of the horizontal elongated hole is set along the horizontal direction of the pressure equalization box (11), and the length direction of the vertical elongated hole extends along the height direction of the pressure equalization box (11).

7. The skid-mounted fracturing fluid mixing device according to claim 1, characterized in that: A second conveying pipe (7) is connected between the water storage tank (4) and the mixing tank (1). A connecting pipe is connected to the second conveying pipe (7). The connecting pipe is connected to the fixed pipe (18). A first valve is installed on the connecting pipe. A second valve is connected to the second conveying pipe (7). A liquid outlet pipe (15) is connected to the bottom of the mixer (6). A discharge pipe (2) is connected to the liquid outlet pipe (15). A third valve is installed on the discharge pipe (2).

8. The skid-mounted fracturing fluid mixing device according to claim 1, characterized in that: A liquid level sensor (12) is provided on the side wall of the mixer (6).

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