Fracturing fluid sand mixing device and method

Abstract

The present invention provides a fracturing fluid sand mixing device and method, which relates to the technical field of stirring equipment and includes: a stirring container, the stirring container includes an upper tank body and a lower tank body, the lower tank body is provided with an opening at the top end, the upper tank body is provided with an opening at the bottom end, and the lower tank body is liftably arranged below the upper tank body; a stirring shaft arranged on the upper tank body, the stirring shaft is provided with blades, and when the upper tank body and the lower tank body are in a butted state, the blades are placed in the lower tank body; and a floating stirring mechanism, the floating stirring mechanism includes at least one guiding groove arranged at the bottom of the lower tank body, a floating block slidably arranged in the guiding groove, and a reciprocating driving device connected to each floating block. In the present invention, the blades can stir the mixed liquid in the radial direction of the lower tank body, and the floating stirring mechanism can stir the mixed liquid in the axial direction of the lower tank body, so that the cooperation of the blades and the floating stirring mechanism can significantly improve the sand mixing efficiency of the fracturing fluid.

Description

Technical Field

[0001] The present invention relates to the technical field of mixing equipment, and particularly relates to a fracturing fluid sand mixing device and method. Background Art

[0002] During the process of oil extraction, fracturing fluid is required. By injecting the fracturing fluid into the production formation, the distribution of oil in the production formation can be improved, which is beneficial to oil extraction. Among them, before injecting the fracturing fluid into the production formation, a certain amount of fine sand grains need to be mixed into the fracturing fluid so that the sand grains are dispersed in the fracturing fluid, thereby increasing the pressure of the fracturing fluid.

[0003] In the prior art, a stirring type sand mixing device is generally used to mix the fracturing fluid and sand grains. The stirring type sand mixing device includes a tank body and a stirrer fixedly installed on the top of the tank body. The stirring blades of the stirrer extend into the tank body. A feeding port is opened at the top of the tank body, and a discharge valve is arranged on the side wall of the tank body. When the stirring type sand mixing device is in use, first turn on the stirrer, drive the blades to rotate by the stirrer to form a stirring state, then inject a certain amount of fracturing fluid into the tank body through the feeding port, and then add a certain amount of sand grains into the tank body through the feeding port. After stirring for a certain period of time, the sand grains are mixed with the fracturing fluid and dispersed in the fracturing fluid. Finally, open the discharge valve to discharge the mixed liquid in the tank body from the discharge valve to a designated storage tank. However, the viscosity of the mixed liquid is relatively high and the fluidity is poor, so it takes a long time to discharge the mixed liquid after sand mixing, and the discharging efficiency is low.

[0004] Moreover, during the use of the stirring type sand mixing device, the blades can only be stirred in a single direction driven by the stirrer, and it takes a long time to fully mix the fracturing fluid and sand grains, and the sand mixing efficiency is low. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a fracturing fluid sand mixing device and method for improving the sand mixing efficiency and discharging efficiency.

[0006] The above object of the present invention can be achieved by the following technical solutions. The present invention provides a fracturing fluid sand mixing device, including:

[0007] A stirring container, the stirring container includes an upper tank body and a lower tank body arranged opposite to each other. The lower tank body is provided with an open top end, the upper tank body is provided with an open bottom end, the upper tank body is arranged on a frame, and the lower tank body is arranged below the upper tank body in a liftable manner;

[0008] A stirring shaft arranged on the upper tank body, the stirring shaft is provided with blades, and when the upper tank body and the lower tank body are in a butt joint state, the blades are placed in the lower tank body;

[0009] and a floating stirring mechanism, the floating stirring mechanism including at least one guiding groove arranged at the bottom of the lower tank body, a floating block slidably arranged in the guiding groove, and a reciprocating driving device connected to each of the floating blocks.

[0010] In a preferred embodiment of the present invention, the fracturing fluid sand mixing device further includes a lifting plate and at least two lifting oil cylinders arranged below the lifting plate. The lifting plate is connected to the piston rods of the lifting oil cylinders, and the lower tank body is swingably arranged on the lifting plate.

[0011] In a preferred embodiment of the present invention, two bearing seats arranged oppositely are provided on the lifting plate. A rotating shaft is arranged between the two bearing seats. The lower tank body is arranged on the rotating shaft. One end of the rotating shaft is connected with a hydraulic motor, and the hydraulic motor can drive the rotating shaft to rotate, driving the lower tank body to turn over for blanking.

[0012] In a preferred embodiment of the present invention, a plurality of air outlet holes are annularly arranged at the lower part of the lower tank body. An air compressor is provided on the lifting plate, and the air compressor is connected to each of the air outlet holes through an air distribution pipeline.

[0013] In a preferred embodiment of the present invention, the air distribution pipeline includes an annular pipe annularly arranged outside the lower tank body, a branch pipe arranged between the annular pipe and each of the air outlet holes, and a connecting hose arranged at the outlet of the air compressor. One-way valves are provided on each of the branch pipes, and the connecting hose is communicated with the annular pipe.

[0014] In a preferred embodiment of the present invention, an installation bracket is provided on the lower tank body. The reciprocating driving device includes a reciprocating oil cylinder arranged on the installation bracket. A floating plate is provided on the piston rod of the reciprocating oil cylinder, and each of the floating blocks is connected to the floating plate.

[0015] In a preferred embodiment of the present invention, a motor is further provided on the upper tank body. A speed reducer is provided on the motor, and the speed reducer is drivably connected to the stirring shaft.

[0016] In a preferred embodiment of the present invention, the fracturing fluid sand mixing device further includes a controller, and the controller is electrically connected to the lifting oil cylinder, the reciprocating oil cylinder, the hydraulic motor, the air compressor and the motor.

[0017] In a preferred embodiment of the present invention, a sealing ring is provided on the outer edge of the top opening of the lower tank body.

[0018] In a preferred embodiment of the present invention, a feeding port is provided on the upper tank body.

[0019] In a preferred embodiment of the present invention, a dynamic seal is provided between the guiding groove and the floating block.

[0020] In a preferred embodiment of the present invention, the frame includes a workbench and a gantry disposed on the workbench. The upper tank body is disposed on the top of the gantry, and the lifting oil cylinder is disposed on the workbench.

[0021] In a preferred embodiment of the present invention, the fracturing fluid sand mixing device further includes a storage tank. When the lower tank body is in the material discharging state, the storage tank is placed below the lower tank body.

[0022] The present invention also provides a method for mixing fracturing fluid with sand, comprising the following steps:

[0023] Turn on the motor. The torque of the motor drives the stirring shaft to rotate after being decelerated by the reducer, and the stirring shaft drives the blades to rotate.

[0024] When the blades are rotating, a set amount of fracturing fluid and sand grains are injected into the lower tank body through the feeding port on the upper tank body, and the blades are used to stir the fracturing fluid and sand grains to form a mixed liquid.

[0025] Start the air compressor. The air compressor produces compressed air, and the compressed air sequentially passes through the connecting hose, the annular pipe, the one-way valve, and finally is sprayed onto the bottom wall of the lower tank body through the air outlet holes. The compressed air is used to push the mixed liquid to flow radially along the lower tank body.

[0026] Control the piston rod of the reciprocating oil cylinder to perform reciprocating telescopic motion. When the piston rod of the reciprocating oil cylinder extends, it drives the floating plate to move upward, the floating plate drives the floating block to move upward, and the floating block can extend into the lower tank body and push the mixed liquid upward, so that the mixed liquid flows in the vertical direction. When the piston rod of the reciprocating oil cylinder retracts, it drives the floating plate to move downward, the floating plate drives the floating block to move downward, and the floating block re-enters the guiding groove.

[0027] When the mixed liquid is stirred for a set time, turn off the motor, the air compressor, and the reciprocating oil cylinder to complete the stirring operation.

[0028] Control the piston rod of the lifting oil cylinder to move downward, drive the lifting plate to move downward, the lifting plate drives the bearing seat, the hydraulic motor, and the air compressor to move downward synchronously, and further drive the lower tank body to move downward, so that the lower tank body is separated from the upper tank body. At this time, the mixed liquid moves downward synchronously with the lower tank body.

[0029] After the piston rod of the lifting oil cylinder is fully retracted, a storage tank is arranged below the lower tank body, and the hydraulic motor is started. The hydraulic motor is used to drive the rotating shaft to rotate, driving the lower tank body to rotate around the axis of the rotating shaft;

[0030] When the rotating shaft rotates to a set angle, the hydraulic motor is turned off, and the mixed liquid in the lower tank body is poured into the storage tank from the top opening of the lower tank body to complete the blanking operation.

[0031] The technical solution of the present invention has the following remarkable beneficial effects:

[0032] When the fracturing fluid sand mixing device of the present invention is used, the fracturing fluid and sand grains are injected into the lower tank body, the upper tank body and the lower tank body are closed, and the fracturing fluid and sand grains are stirred by the blades on the stirring shaft to form a mixed liquid. And during the stirring process of the blades, the floating stirring mechanism can also be started to reciprocate the mixed liquid up and down by using the floating block. During the process of the floating block pushing the mixed liquid up and down, the contact area between the fracturing fluid and the sand grains is also increased, which is beneficial to improving the mixing efficiency of the fracturing fluid and the sand grains. The present invention can stir the mixed liquid along the radial direction of the lower tank body through the blades, and can stir the mixed liquid along the axial direction of the lower tank body through the floating stirring mechanism. Therefore, the cooperation of the blades and the floating stirring mechanism can significantly improve the sand mixing efficiency of the fracturing fluid.

[0033] Furthermore, during the process of the blades and the floating stirring mechanism stirring the mixed liquid, the air compressor can also be started to spray compressed air into the lower tank body from the air outlet holes by using the air compressor, and the compressed air is used to push the mixed liquid to flow along the radial direction of the lower tank body, thereby increasing the flow velocity of the mixed liquid and further accelerating the mixing efficiency of the fracturing fluid and the sand grains.

[0034] And when the mixed liquid reaches the set target, the lower tank body can also be driven to descend by the lifting oil cylinder, the lower tank body is separated from the upper tank body, the hydraulic motor is started to drive the lower tank body to turn over, and the mixed liquid is poured into the storage tank through the top opening on the lower tank body to complete the blanking operation. The top opening on the lower tank body of the present invention has a relatively large opening area. Compared with the prior art of blanking through a discharge valve, blanking through the top opening on the lower tank body can significantly improve the blanking efficiency. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention disclosure in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are merely schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can, under the teachings of the present invention, select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention.

[0037] Figure 1 It is a schematic sectional structure diagram of a fracturing fluid sand mixing device;

[0038] Figure 2 is Figure 1 the schematic diagram of the A-A cross-section in

[0039] Figure 3 It is a schematic side structure diagram of a floating stirring mechanism;

[0040] Figure 4 It is a schematic top structure diagram of a floating stirring mechanism;

[0041] Figure 5 It is a schematic structure diagram of the fracturing fluid sand mixing device in a stirring state;

[0042] Figure 6 It is a schematic structure diagram of the fracturing fluid sand mixing device in a feeding state.

[0043] The reference numerals of the above accompanying drawings:

[0044] 1, workbench; 2, gantry; 3, lifting oil cylinder; 4, lifting plate; 5, rotating shaft; 6, lower tank body; 7, hydraulic motor; 8, sealing ring; 9, floating stirring mechanism; 10, air vent; 11, annular pipe; 12, check valve; 13, air compressor; 14, upper tank body; 15, stirring shaft; 16, blade; 17, bearing seat; 18, connecting hose; 19, mounting bracket; 20, reciprocating oil cylinder; 21, floating plate; 22, floating block; 23, motor; 24, feeding port; 25, storage tank. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] Embodiment 1

[0047] Please refer to Figure 1As shown in the figure, in an embodiment of the present invention, a fracturing fluid sand mixing device is provided. The fracturing fluid sand mixing device includes: a stirring container, which includes an upper tank body 14 and a lower tank body 6 arranged oppositely. The lower tank body 6 is provided with an opening at the top end, and the upper tank body 14 is provided with an opening at the bottom end. The upper tank body 14 is arranged on a frame, and the lower tank body 6 is arranged below the upper tank body 14 in a liftable manner; a stirring shaft 15 arranged on the upper tank body 14, with blades 16 arranged on the stirring shaft 15. When the upper tank body 14 and the lower tank body 6 are in a butt-jointed state, the blades 16 are placed inside the lower tank body 6; and a floating stirring mechanism 9, which includes at least one guiding groove arranged at the bottom of the lower tank body 6, a floating block 22 slidably arranged in the guiding groove, and a reciprocating driving device connected to each floating block 22.

[0048] Overall, when the fracturing fluid sand mixing device is in use, fracturing fluid and sand grains are injected into the lower tank body 6, the upper tank body 14 and the lower tank body 6 are closed, and the fracturing fluid and sand grains are stirred by the blades 16 on the stirring shaft 15 to form a mixed liquid. And during the stirring process of the blades 16, the floating stirring mechanism 9 can also be started, and the floating block 22 is used to reciprocally stir the mixed liquid up and down. During the process of the floating block 22 pushing the mixed liquid up and down, the contact area between the fracturing fluid and the sand grains is also increased, which is beneficial to improving the mixing efficiency of the fracturing fluid and the sand grains. The present invention can stir the mixed liquid along the radial direction of the lower tank body 6 through the blades 16, and can stir the mixed liquid along the axial direction of the lower tank body 6 through the floating stirring mechanism 9. Therefore, the sand mixing efficiency of the fracturing fluid can be significantly improved by the cooperation of the blades 16 and the floating stirring mechanism 9.

[0049] Designers can determine the shapes of the upper tank body 14 and the lower tank body 6 according to the usage requirements, such as a cuboid shape or a cylindrical shape, which are not specifically limited herein.

[0050] In an embodiment of the present invention, the fracturing fluid sand mixing device further includes a lifting plate 4 and at least two lifting oil cylinders 3 arranged below the lifting plate 4. The lifting plate 4 is connected to the piston rods of the respective lifting oil cylinders 3, and the lower tank body 6 is swingably arranged on the lifting plate 4.

[0051] Specifically, two lifting oil cylinders 3 are symmetrically arranged below the lower tank body 6, and the piston rods of the two lifting oil cylinders 3 are both connected to the lifting plate 4. The lower tank body 6 is swingably arranged on the lifting plate 4, and the lower tank body 6 can move up and down with the lifting plate 4. Therefore, the docking or separation of the lower tank body 6 and the upper tank body 14 can be controlled through the lifting oil cylinders 3.

[0052] When the lower tank body 6 is separated from the upper tank body 14, the mixed liquid can be poured out from the top opening on the lower tank body 6 by rotating the lower tank body 6 to realize the blanking process.

[0053] In an embodiment of the present invention, two bearing seats 17 are provided on the lifting plate 4 and are oppositely arranged. A rotating shaft 5 is arranged between the two bearing seats 17. The lower tank body 6 is arranged on the rotating shaft 5. One end of the rotating shaft 5 is connected with a hydraulic motor 7. The hydraulic motor 7 can drive the rotating shaft 5 to rotate, driving the lower tank body 6 to turn over for discharging materials.

[0054] Specifically, the two bearing seats 17 are symmetrically arranged on the lifting plate 4. A rotating shaft 5 is arranged between the two bearing seats 17. The lower tank body 6 is embedded in the middle of the rotating shaft 5, so that the lower tank body 6 can swing along the rotating shaft 5 for discharging materials. And in order to improve the discharging efficiency and save manpower, one end of the rotating shaft 5 is connected with a hydraulic motor 7. By starting the hydraulic motor 7, the rotating shaft 5 can be driven to rotate, thereby driving the lower tank body 6 to turn over for discharging materials. The designer can determine the turning angle of the lower tank body 6 according to the discharging requirement of the mixed liquid, which is not specifically limited here.

[0055] In an embodiment of the present invention, as Figure 1 and Figure 2 shown in the embodiment, a plurality of air outlet holes 10 are annularly arranged at the lower part of the lower tank body 6. An air compressor 13 is arranged on the lifting plate 4. The air compressor 13 is connected to each air outlet hole 10 through an air distribution pipeline.

[0056] Specifically, the plurality of air outlet holes 10 are arranged on the side wall of the lower tank body 6, and the air outlet direction of the air outlet holes 10 faces the bottom of the lower tank body 6, so as to increase the stirring range of the compressed air on the mixed liquid. During the process of the blades 16 and the floating stirring mechanism 9 stirring the mixed liquid, the air compressor 13 is started, and the compressed air is sprayed into the lower tank body 6 from the air outlet holes 10 by using the air compressor 13. The compressed air is used to push the mixed liquid to flow radially along the lower tank body 6, thereby increasing the flow velocity of the mixed liquid and further improving the mixing efficiency of the fracturing fluid and the sand grains.

[0057] In an embodiment of the present invention, the air distribution pipeline includes an annular pipe 11 annularly arranged outside the lower tank body 6, branch pipes arranged between the annular pipe 11 and each air outlet hole 10, and a connecting hose 18 arranged at the outlet of the air compressor 13. One-way valves 12 are arranged on the branch pipes, and the connecting hose 18 is communicated with the annular pipe 11.

[0058] By using the annular pipe 11 to distribute air to each air outlet hole 10, the air distribution uniformity of the compressed air in each air outlet hole 10 is improved. And through the one-way valves 12 arranged on each branch pipe, the one-way valves 12 can conduct the compressed air unidirectionally, preventing the mixed liquid from entering the annular pipe 11 and avoiding the problem of material leakage. The designer can determine the setting quantity of the air outlet holes 10 according to the use requirement, which is not specifically limited here.

[0059] The connecting hose 18 can provide a margin for the rotation process of the lower tank body 6, avoiding the lower tank body 6 pulling the air compressor 13 and the annular pipe 11 when rotating.

[0060] In an embodiment of the present invention, as Figure 3 and Figure 4 shown in the embodiment, an installation bracket 19 is provided on the lower tank body 6. The reciprocating driving device includes a reciprocating oil cylinder 20 provided on the installation bracket 19. A floating plate 21 is provided on the piston rod of the reciprocating oil cylinder 20, and each floating block 22 is connected to the floating plate 21.

[0061] Specifically, as Figure 5 shown in the embodiment, the reciprocating oil cylinder 20 is fixed to the lower tank body 6 through the installation bracket 19. The reciprocating oil cylinder 20 can push the floating plate 21 to drive each floating block 22 to perform telescopic movement in the guide groove.

[0062] The floating block 22 can reciprocally stir the mixed liquid up and down. During the process of pushing the mixed liquid up and down, the floating block 22 also increases the contact area between the fracturing fluid and the sand grains, which is beneficial to improving the mixing efficiency of the fracturing fluid and the sand grains. Designers can determine the setting quantity and arrangement mode of the floating blocks 22 according to the usage requirements, and no specific limitation is made here.

[0063] In an embodiment of the present invention, a motor 23 is further provided on the upper tank body 14. A speed reducer (not shown) is provided on the motor 23, and the speed reducer is drivably connected to the stirring shaft 15.

[0064] Specifically, the motor 23 and the speed reducer are installed at the top of the upper tank body 14 and are centrally arranged, so that the stirring shaft 15 can pass through the middle of the upper tank body 14. After the upper tank body 14 is docked with the lower tank body 6, the stirring shaft 15 and the blades 16 on the stirring shaft 15 can be arranged in the middle of the lower tank body 6, so as to stir the mixed liquid in the lower tank body 6 more evenly.

[0065] In an embodiment of the present invention, the fracturing fluid sand mixing device further includes a controller (not shown), and the controller is electrically connected to the lifting oil cylinder 3, the reciprocating oil cylinder 20, the hydraulic motor 7, the air compressor 13, and the motor 23.

[0066] By manually operating the controller, the motion states of the lifting oil cylinder 3, the reciprocating oil cylinder 20, the hydraulic motor 7, the air compressor 13, and the motor 23 can be controlled, so that the mixing process of the fracturing fluid and the sand grains can be conveniently controlled.

[0067] Furthermore, a control program can be preset in the controller, and the operations of controlling the lifting oil cylinder 3, the reciprocating oil cylinder 20, the hydraulic motor 7, the air compressor 13, and the motor 23 are automatically executed by using the control program, thereby realizing an automated production process and significantly improving the production yields of the fracturing fluid and the sand grains.

[0068] In an embodiment of the present invention, a sealing ring 8 is provided on the outer edge of the top opening of the lower tank body 6. After the upper tank body 14 and the lower tank body 6 are docked, the sealing ring 8 can achieve a sealing effect, avoiding the problem of leakage of the mixed liquid during the stirring process. Designers can determine the model of the sealing ring 8 according to the usage requirements, and no specific limitation is made here.

[0069] In an embodiment of the present invention, a feeding port 24 is provided on the upper tank body 14. Specifically, the feeding port 24 is arranged on the side of the stirring shaft 15. By providing the feeding port 24 on the upper tank body 14, when the upper tank body 14 and the lower tank body 6 are in a docked state, it is convenient to inject the fracturing fluid and sand grains into the lower tank body 6. It is also convenient to adjust the injection amount of the fracturing fluid or sand grains through the feeding port 24 during the stirring process.

[0070] In an embodiment of the present invention, a dynamic seal (not shown) is provided between the guide groove and the floating block 22. The dynamic seal can seal the guide groove and the floating block 22, avoiding the leakage of the mixed liquid between the floating block 22 and the guide groove. Designers can determine the model of the dynamic seal according to the usage requirements, such as a dynamic sealing ring, etc., and no specific limitation is made here.

[0071] In an embodiment of the present invention, the frame includes a workbench 1 and a gantry 2 arranged on the workbench 1. The upper tank body 14 is arranged on the top of the gantry 2, and the lifting oil cylinder 3 is arranged on the workbench 1. By fixedly arranging the upper tank body 14 on the top of the gantry 2, the motor 23 and the stirring shaft 15 located on the upper tank body 14 can also be fixedly arranged, reducing the vibration generated during the operation of the stirring shaft 15 and improving the stirring stability of the stirring shaft 15.

[0072] In an embodiment of the present invention, as Figure 6 shown in the embodiment, the fracturing fluid sand mixing device further includes a storage tank 25. When the lower tank body 6 is in the discharging state, the storage tank 25 is placed below the lower tank body 6. After the mixed liquid is stirred well, the storage tank 25 is moved below the lower tank body 6, and the lower tank body 6 is rotated to pour the stirred mixed liquid into the storage tank 25. Designers can determine the shape of the storage tank 25 according to the usage requirements, and no limitation is made here.

[0073] Embodiment 2

[0074] An embodiment of the present invention also provides a method for mixing fracturing fluid and sand, including the following steps:

[0075] Step 101: Turn on the motor 23. The torque of the motor 23 drives the stirring shaft 15 to rotate after being decelerated by the reducer, and the stirring shaft 15 drives the blades 16 to rotate;

[0076] Step 102: With the blade 16 in a rotating state, inject a set amount of fracturing fluid and sand grains into the lower tank 6 through the feeding port 24 on the upper tank body 14, and use the blade 16 to stir the fracturing fluid and sand grains to form a mixture;

[0077] Step 103: Start the air compressor 13. The air compressor 13 produces compressed air. The compressed air sequentially passes through the connecting hose 18, the annular pipe 11, the one-way valve 12, and finally is sprayed onto the bottom wall of the lower tank 6 through the air outlet 10. Use the compressed air to push the mixture to flow radially along the lower tank 6;

[0078] Step 104: Control the piston rod of the reciprocating oil cylinder 20 to perform reciprocating telescopic motion. When the piston rod of the reciprocating oil cylinder 20 extends, drive the floating plate 21 to move upward. The floating plate 21 drives the floating block 22 to move upward. The floating block 22 can extend into the lower tank 6 and push the mixture upward, causing the mixture to flow in the vertical direction; when the piston rod of the reciprocating oil cylinder 20 retracts, drive the floating plate 21 to move downward. The floating plate 21 drives the floating block 22 to move downward, so that the floating block 22 re-enters the guide groove;

[0079] Step 105: When the mixture is stirred for a set time, turn off the motor 23, the air compressor 13, and the reciprocating oil cylinder 20 to complete the stirring operation;

[0080] Step 106: Control the piston rod of the lifting oil cylinder 3 to move downward, drive the lifting plate 4 to move downward. The lifting plate 4 drives the bearing seat 17, the hydraulic motor 7, and the air compressor 13 to move downward synchronously, and further drives the lower tank 6 to move downward, so that the lower tank 6 is separated from the upper tank body 14. At this time, the mixture moves downward synchronously with the lower tank 6;

[0081] Step 107: After the piston rod of the lifting oil cylinder 3 is fully retracted, set up a storage tank 25 below the lower tank 6, and start the hydraulic motor 7. Use the hydraulic motor 7 to drive the rotating shaft 5 to rotate, and drive the lower tank 6 to rotate around the axis of the rotating shaft 5;

[0082] Step 108: When the rotating shaft 5 rotates to a set angle, turn off the hydraulic motor 7, and pour the mixture in the lower tank 6 from the top opening of the lower tank 6 into the storage tank 25 to complete the blanking operation.

[0083] In the embodiment of the present invention, the fracturing fluid sand mixing method further includes:

[0084] Step 109: After the blanking is completed, control the hydraulic motor 7 to drive the lower tank 6 to reset, and drive the lower tank 6 to dock on the upper tank body 14 through the lifting oil cylinder 3, and repeat steps 101 to 107 to manufacture other batches of mixtures.

[0085] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" in describing a combination shall include the identified elements, ingredients, components, or steps, as well as other elements, ingredients, components, or steps that do not materially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combinations of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may" herein, it is intended that any of the attributes described as "may" include be optional. A plurality of elements, ingredients, components, or steps can be provided by a single integrated element, ingredient, component, or step. Alternatively, a single integrated element, ingredient, component, or step can be separated into a plurality of distinct elements, ingredients, components, or steps. The disclosure of "a" or "an" to describe an element, ingredient, component, or step does not mean to exclude other elements, ingredients, components, or steps.

[0086] Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, reference can be made to each other. The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the protection scope of the present invention cannot be limited thereby. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A fracturing fluid sand mixing device, characterized in that, it includes: a stirring container, the stirring container includes an upper tank body (14) and a lower tank body (6) arranged oppositely, the lower tank body (6) is provided with an opening at the top end, the upper tank body (14) is provided with an opening at the bottom end, the upper tank body (14) is arranged on a frame, and the lower tank body (6) is arranged below the upper tank body (14) in a liftable manner; a stirring shaft (15) arranged on the upper tank body (14), blades (16) are arranged on the stirring shaft (15), and when the upper tank body (14) and the lower tank body (6) are in a butted state, the blades (16) are placed in the lower tank body (6); and a floating stirring mechanism (9), the floating stirring mechanism (9) includes at least one guiding groove arranged at the bottom of the lower tank body (6), a floating block (22) slidably arranged in the guiding groove, and a reciprocating driving device connected to each floating block (22); an installation bracket (19) is arranged on the lower tank body (6), the reciprocating driving device includes a reciprocating oil cylinder (20) arranged on the installation bracket (19), a floating plate (21) is arranged on the piston rod of the reciprocating oil cylinder (20), and each floating block (22) is connected to the floating plate (21); a dynamic seal is arranged between the guiding groove and the floating block (22); the fracturing fluid sand mixing device further includes a lifting plate (4) and at least two lifting oil cylinders (3) arranged below the lifting plate (4), the lifting plate (4) is connected to the piston rods of the lifting oil cylinders (3), and the lower tank body (6) is swingably arranged on the lifting plate (4); two bearing seats (17) arranged oppositely are arranged on the lifting plate (4), a rotating shaft (5) is arranged between the two bearing seats (17), the lower tank body (6) is arranged on the rotating shaft (5), one end of the rotating shaft (5) is connected with a hydraulic motor (7), and the hydraulic motor (7) can drive the rotating shaft (5) to rotate, driving the lower tank body (6) to turn over for blanking.

2. The fracturing fluid sand mixing device according to claim 1, characterized in that, a plurality of air outlet holes (10) are annularly arranged at the lower part of the lower tank body (6), an air compressor (13) is arranged on the lifting plate (4), and the air compressor (13) is connected to each air outlet hole (10) through an air distribution pipeline.

3. The fracturing fluid sand mixing device according to claim 2, characterized in that, the air distribution pipeline includes an annular pipe (11) annularly arranged outside the lower tank body (6), branch pipes arranged between the annular pipe (11) and each air outlet hole (10), and a connecting hose (18) arranged at the outlet of the air compressor (13), one-way valves (12) are arranged on the branch pipes, and the connecting hose (18) is communicated with the annular pipe (11).

4. The fracturing fluid sand mixing device according to claim 3, characterized in that, a motor (23) is further arranged on the upper tank body (14), a speed reducer is arranged on the motor (23), and the speed reducer is drivably connected to the stirring shaft (15).

5. The fracturing fluid sand mixing device according to claim 4, characterized in that, the fracturing fluid sand mixing device further comprises a controller, and the controller is electrically connected to the lifting oil cylinder (3), the reciprocating oil cylinder (20), the hydraulic motor (7), the air compressor (13) and the motor (23).

6. The fracturing fluid sand mixing device according to claim 1, characterized in that, a sealing ring (8) is provided on the outer edge of the top opening of the lower tank body (6).

7. The fracturing fluid sand mixing device according to claim 1, characterized in that, a feeding port (24) is provided on the upper tank body (14).

8. The fracturing fluid sand mixing device according to claim 1, characterized in that, the frame comprises a workbench (1) and a gantry (2) arranged on the workbench (1), the upper tank body (14) is arranged on the top of the gantry (2), and the lifting oil cylinder (3) is arranged on the workbench (1).

9. The fracturing fluid sand mixing device according to claim 1, characterized in that, the fracturing fluid sand mixing device further comprises a storage tank (25), and when the lower tank body (6) is in the state of discharging materials, the storage tank (25) is placed below the lower tank body (6).

10. A method for mixing fracturing fluid with sand, characterized in that, it is realized by using the fracturing fluid sand mixing device according to any one of claims 1 to 9, and comprises the following steps: Turn on the motor (23), the torque of the motor (23) drives the stirring shaft (15) to rotate after being decelerated by the reducer, and the stirring shaft (15) drives the blades (16) to rotate; When the blades (16) are in the rotating state, a set amount of fracturing fluid and sand grains are injected into the lower tank body (6) through the feeding port (24) on the upper tank body (14), and the blades (16) are used to stir the fracturing fluid and sand grains to form a mixed liquid; Start the air compressor (13), the air compressor (13) produces compressed air, and the compressed air sequentially passes through the connecting hose (18), the annular pipe (11), the one-way valve (12), and finally is sprayed onto the bottom wall of the lower tank body (6) through the air outlet hole (10), and the compressed air is used to push the mixed liquid to flow radially along the lower tank body (6); Control the piston rod of the reciprocating oil cylinder (20) to make reciprocating telescopic movements. When the piston rod of the reciprocating oil cylinder (20) extends, it drives the floating plate (21) to move upward, the floating plate (21) drives the floating block (22) to move upward, and the floating block (22) can extend into the lower tank body (6) and push the mixed liquid upward, so that the mixed liquid flows in the vertical direction; when the piston rod of the reciprocating oil cylinder (20) retracts, it drives the floating plate (21) to move downward, the floating plate (21) drives the floating block (22) to move downward, so that the floating block (22) re-enters the guide groove; When the mixed liquid is stirred for a set time, turn off the motor (23), the air compressor (13) and the reciprocating oil cylinder (20) to complete the stirring operation; Control the piston rod of the lifting oil cylinder (3) to move downward, driving the lifting plate (4) to move downward. The lifting plate (4) drives the bearing seat (17), the hydraulic motor (7) and the air compressor (13) to move downward synchronously, thereby driving the lower tank body (6) to move downward, separating the lower tank body (6) from the upper tank body (14). At this time, the mixed liquid moves downward synchronously with the lower tank body (6). After the piston rod of the lifting oil cylinder (3) is fully retracted, a storage tank (25) is arranged below the lower tank body (6), and the hydraulic motor (7) is started. The hydraulic motor (7) is used to drive the rotating shaft (5) to rotate, driving the lower tank body (6) to rotate around the axis of the rotating shaft (5). When the rotating shaft (5) rotates to a set angle, the hydraulic motor (7) is turned off, and the mixed liquid in the lower tank body (6) is poured from the top opening of the lower tank body (6) into the storage tank (25) to complete the blanking operation.

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