Dry powder variable-viscosity fracturing fluid continuous mixing device

Abstract

The invention discloses a dry powder variable-viscosity fracturing fluid continuous mixing device, and relates to the field of dry powder mixing, the dry powder variable-viscosity fracturing fluid continuous mixing device comprises a stirring tank, the top end of the stirring tank is provided with four groups of raw material barrels and a group of mixing mechanism, the raw material barrels are communicated with the mixing mechanism through pipelines, and the top end of the mixing mechanism is provided with an exhaust cover plate; the exhaust cover plate is attached to the top end of the mixing mechanism in a sealed mode, when air pressure in the mixing mechanism is increased, the exhaust cover plate moves upwards, and a motor is installed at the bottom end of the stirring tank. In the material mixing process, the motor drives the rotating shaft to rotate, the rotating shaft drives the stirring fan blades and the flowing fan blades to rotate, the stirring fan blades mix raw materials, and the flowing fan blades drive air flow to flow, so that the air flow is firstly exhausted through the exhaust cover plate; and the residual air flow enters the stirring tank through the return pipe to stir the raw materials sinking to the bottom in the stirring tank, so that the raw materials are conveniently mixed.

Description

Technical Field

[0001] The invention relates to the field of dry powder mixing, in particular to a dry powder variable viscosity fracturing fluid continuous mixing device. Background Art

[0002] Viscous fracturing fluid is a liquid used in hydraulic fracturing operations. Its main function is to introduce cracks into the formation through high pressure to help the exploitation of resources such as oil and gas. Viscous fracturing fluid has the characteristics of strong viscosity and elasticity, which can form good support in the cracks, prevent crack collapse, and promote the flow of oil and gas in the formation. It is usually composed of water, sand, chemical additives and polymers. The polymer gives the liquid a higher viscosity, so that it can better carry proppants (such as sand) into the cracks during the fracturing process. During the production process of existing viscous fracturing fluids, they are usually stirred and injected on site, and mixing equipment is usually used to continuously stir and mix multiple raw materials.

[0003] The prior art, such as a dry powder variable viscosity fracturing fluid continuous mixing device disclosed in Chinese patent publication number CN118341311A, comprises: A mixing tank is used for premixing the raw materials of the fracturing fluid, wherein the mixing tank is provided with a liquid feed port, a dry powder feed port and a premixed product discharge port, the angle between the center line of the liquid feed port and the radial line of the mixing tank is an acute angle or a right angle, and the angle between the center line of the liquid feed port and the center line of the mixing tank is an acute angle or a right angle, so that the liquid generates a swirl in the mixing tank after entering the mixing tank from the liquid feed port; a guide plate is provided on the annular inner wall of the mixing tank, and the angle between the guide plate and the center line of the mixing tank is an acute angle, which is used to guide the rotating fluid to flow along the axial direction of the mixing tank; the premixed product discharge port is located at the bottom of the mixing tank, and the dry powder feed port is located at the top of the mixing tank; A booster pump whose inlet is connected to the premixed product discharge port, used to pressurize the premixed fracturing fluid in the mixing tank; The emulsification pump, whose inlet is connected to the outlet of the booster pump, is used for high-speed shear mixing of the fracturing fluid.

[0004] In the prior art, multiple groups of feed ports are usually used to add different powders during the mixing process. However, although this method can avoid mixing between powders, it will result in a larger opening at the top of the equipment. The up and down stirring method is used during the stirring process, which will cause water to splash into the inside of the feed pipe, and over time will cause caking and blockage of the inner wall of the feed pipe. If a cleaning method is used, multiple groups of feed ports need to be cleaned, and the effect is poor. Secondly, during the stirring process, although the powders are quickly mixed and stirred by the different shear forces of the water flow to reduce the generation of caking, a large number of bubbles will be generated during the stirring process, thereby affecting the quality of the viscous fracturing fluid. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a dry powder variable viscosity fracturing fluid continuous mixing device to solve the technical problems that the inner wall of the feeding pipeline is inconvenient to clean and the bubbles generated during the stirring process affect the quality.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dry powder variable viscosity fracturing fluid continuous mixing device, comprising a stirring tank, four groups of raw material barrels and a group of mixing mechanisms are installed on the top of the stirring tank, the raw material barrels are connected to the mixing mechanism through pipelines, an exhaust cover is installed on the top of the mixing mechanism, the exhaust cover is sealed and fitted with the top of the mixing mechanism, when the internal air pressure of the mixing mechanism increases, the exhaust cover moves upward, a motor is installed at the bottom end of the stirring tank, the output end of the motor is connected to a rotating shaft, the rotating shaft passes through the stirring tank and The mixing mechanism extends to the interior of the mixing mechanism, and a stirring blade and a flow blade are installed on the outside of the rotating shaft. The stirring blade is located inside the mixing tank, and the flow blade is located inside the mixing mechanism, and the flow blade is located above the connecting port of the raw material barrel. A stirring structure is installed on the outer wall of the rotating shaft, and the stirring structure mixes the incoming raw materials. An inner support frame is installed inside the mixing mechanism, and a baffle is installed at the bottom end of the inner support frame extending to the interior of the mixing tank. Four groups of reflux pipes are installed on the outside of the mixing mechanism, and the reflux pipes extend to the bottom end of the mixing tank.

[0007] By adopting the above technical scheme, it is convenient to mix the raw materials, and the raw materials are broken by the stirring structure, reducing the water droplets splashing into the stirring tank and preventing water from entering the mixing mechanism. During the stirring process, the air flow is injected into the stirring tank through the reflux pipe to stir and mix the impurities settled at the bottom.

[0008] The present invention is further configured such that a top plate is installed on the top of the mixing tank, the raw material barrel and the mixing mechanism are located above the top plate, a support frame is also installed on the top of the mixing tank, the raw material barrel is fixed inside the support frame, and the side of the mixing tank is connected with a discharge outlet and two groups of support legs, and the two groups of support legs are symmetrically arranged.

[0009] As a preferred embodiment, it is possible to conveniently limit the position of the mixing tank and the raw material barrel, so as to facilitate the raw materials to enter the mixing tank.

[0010] The present invention is further configured as follows: a cover plate is installed on the top of the raw material barrel, a rotating shaft is connected to the side of the cover plate, the cover plate is rotatably connected to the raw material barrel through the rotating shaft, a handle is connected to the top of the cover plate, a cannula is installed on the bottom of the raw material barrel, the cannula is connected to the mixing mechanism, and a control valve is installed inside the cannula, which controls the flow of the cannula.

[0011] As a preferred embodiment, it is convenient to inject the raw materials into the raw material barrel and control the time and sequence of the raw materials entering the mixing mechanism according to the valve.

[0012] The present invention is further configured as follows: a fixed seat is installed on the outer side of the mixing mechanism, the mixing mechanism is fixedly connected to the stirring tank through the fixed seat, a plurality of groups of first connecting pipes are installed on the mixing mechanism above the fixed seat, the mixing mechanism is connected to the raw material barrel through the first connecting pipe, a plurality of groups of second connecting pipes are installed on the top of the mixing mechanism, the reflux pipe is connected to the mixing mechanism through the second connecting pipe, an exhaust port is opened at the top of the mixing mechanism located in the middle of the plurality of second connecting pipes, and an exhaust cover plate is located above the exhaust port.

[0013] Preferably, the air in the mixing tank can be conveniently discharged through the exhaust port to reduce the air pressure in the mixing tank.

[0014] The present invention is further configured such that a fixed plate is installed inside the mixing mechanism, a movable rod and a protruding edge are connected to the bottom end of the exhaust cover plate, a groove is opened at the top end of the mixing mechanism, the exhaust cover plate is engaged with the groove through the movable rod, a spring sleeve is connected to the top end of the fixed plate, and the movable rod is inserted into the interior of the spring sleeve.

[0015] As a preferred embodiment, the exhaust cover plate can be conveniently sealed with the mixing mechanism to improve the sealing effect.

[0016] The present invention is further configured such that a guide rod is installed in the middle position of the rotating shaft, a lower gear ring and an upper gear ring are installed at the top and bottom ends of the guide rod, the guide rod is located on the inner side of the inner support frame, a mixing disk is installed on the outer side of the inner support frame, the mixing disk includes a gear, a connecting rod and a twisted iron rod, the gear is meshed with the lower gear ring and the upper gear ring, and the twisted iron rod is aligned with the first connecting tube.

[0017] As a preferred embodiment, it is convenient to drive the mixing disk to rotate, thereby driving the twisted iron rod to crush and stir the raw materials.

[0018] The present invention is further configured such that the lower gear ring and the upper gear ring are semi-ring structures, and the lower gear ring and the upper gear ring are arranged alternately.

[0019] As a preferred embodiment, it is convenient to drive the mixing disk to rotate at different angles.

[0020] The present invention is further configured such that a slot is provided at the top of the inner support frame, and the top of the inner support frame is located below the flow blades, and the width of the baffle plate connected to the bottom of the inner support frame is greater than the opening at the bottom of the mixing mechanism.

[0021] As a preferred embodiment, the mixing mechanism can be conveniently sealed to reduce the probability of stirred water splashing into the mixing mechanism.

[0022] In summary, the present invention mainly has the following beneficial effects: The present invention provides a mixing mechanism. During use, raw materials are injected into the mixing mechanism through a raw material barrel. The rotation of the rotating shaft drives each group of mixing disks on the outside to rotate at multiple angles. The mixing disk is aligned with the discharge port. The discharged raw materials are crushed under the action of the twisted iron rod at the end of the mixing disk. The crushed raw materials fall onto the shielding plate, which prevents the raw materials from falling directly into the mixing tank and reduces the splashing of liquid. The shielding plate can effectively reduce the splashing of liquid into the mixing mechanism during the stirring process, thereby reducing the pollution in the mixing mechanism.

[0023] The present invention provides a mixing mechanism, an exhaust cover plate and a motor. During the mixing process, the motor drives the rotating shaft to rotate, and the rotating shaft drives the stirring blades and the flow blades to rotate. The stirring blades mix the raw materials, and the flow blades drive the airflow to flow, so that the airflow is first discharged through the exhaust cover plate. When the air pressure inside the stirring tank is reduced, the remaining airflow will enter the stirring tank through the reflux pipe to stir the raw materials settled at the bottom of the stirring tank, thereby facilitating the mixing of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the raw material barrel of the present invention; Figure 3 It is a structural schematic diagram of the mixing mechanism of the present invention; Figure 4 It is a structural schematic diagram of the cross section of the mixing mechanism of the present invention; Figure 5 It is a structural schematic diagram of the cross section of the stirring tank of the present invention; Figure 6 It is a structural schematic diagram of the connection between the mixing mechanism and the top plate of the present invention; Figure 7 It is a schematic diagram of the structure of the flow fan blade of the present invention; Figure 8 It is a schematic diagram of the structure of the mixing disk of the present invention; Fig. 9 It is a schematic structural diagram of the exhaust cover plate of the present invention.

[0025] Description of reference numerals: 1. Mixing tank; 101. Top plate; 102. Support frame; 103. Discharge port; 104. Support leg; 2. Raw material barrel; 201. Cover plate; 202. Rotating shaft; 203. Handle; 204. Insert tube; 205. Control valve; 3. Mixing mechanism; 301. Fixed seat; 302. First connecting pipe; 303. Second connecting pipe; 4. Exhaust cover plate; 401. Fixed plate; 402. Movable rod; 403. Protruding edge; 404. Spring sleeve; 5. Motor; 501. Rotating shaft; 5011. Guide rod; 5012. Lower gear ring; 5013. Upper gear ring; 502. Mixing blade; 503. Flowing blade; 6. Mixing plate; 601. Gear; 602. Connecting rod; 603. Twisted iron rod; 7. Inner support frame; 8. Baffle plate; 9. Reflux pipe. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] The following describes an embodiment of the present invention based on its overall structure.

[0028] See also Figures 1 to 5 , comprising a stirring tank 1, four groups of raw material barrels 2 and one group of mixing mechanism 3 are installed on the top of the stirring tank 1, a top plate 101 is installed on the top of the stirring tank 1, the raw material barrels 2 and the mixing mechanism 3 are located above the top plate 101, a support frame 102 is also installed on the top of the stirring tank 1, the raw material barrels 2 are fixed inside the support frame 102, a discharge port 103 and two groups of supporting legs 104 are connected to the side of the stirring tank 1, the two groups of supporting legs 104 are symmetrically arranged, a cover plate 201 is installed on the top of the raw material barrel 2, and the side of the cover plate 201 is connected The cover plate 201 is rotatably connected to the raw material barrel 2 via the rotating shaft 202. A handle 203 is connected to the top of the cover plate 201 to facilitate opening the raw material barrel 2 and putting the raw materials into the raw material barrel 2. A plug 204 is installed at the bottom of the raw material barrel 2. The plug 204 is connected to the mixing mechanism 3, and a control valve 205 is installed inside the plug 204. The control valve 205 controls the flow of the plug 204, which facilitates the injection of different raw materials into the mixing tank 1 through the raw material barrel 2 and controls it through the valve.

[0029] See also Figure 3 , 4 as well as Fig. 9An exhaust cover plate 4 is installed at the top of the mixing mechanism 3, and the exhaust cover plate 4 is sealed with the top of the mixing mechanism 3. When the internal air pressure of the mixing mechanism 3 increases, the exhaust cover plate 4 moves upward, and a motor 5 is installed at the bottom of the stirring tank 1. The output end of the motor 5 is connected to a rotating shaft 501, and the rotating shaft 501 passes through the stirring tank 1 and extends to the inside of the mixing mechanism 3. A stirring blade 502 and a flow blade 503 are installed on the outside of the rotating shaft 501. The stirring blade 502 is located inside the stirring tank 1, and the flow blade 503 is located inside the mixing tank. The interior of the mixing mechanism 3 is provided with a flow fan blade 503, and the flow fan blade 503 is located above the connecting port of the raw material barrel 2. The outer wall of the rotating shaft 501 is provided with a stirring structure, and the stirring structure mixes the incoming raw materials. The interior of the mixing mechanism 3 is provided with an inner support frame 7, and the bottom end of the inner support frame 7 extends to the interior of the stirring tank 1 and a baffle plate 8 is provided, which can stir the raw materials. At the same time, the flow fan blade 503 drives the airflow into the mixing mechanism 3, and the airflow pushes the exhaust cover plate 4 to open, so as to send out part of the airflow in the stirring tank 1 and reduce the air pressure in the stirring tank 1.

[0030] See also Figures 3 to 9 A fixing seat 301 is installed on the outside of the mixing mechanism 3, and the mixing mechanism 3 is fixedly connected to the stirring tank 1 through the fixing seat 301. The mixing mechanism 3 is located above the fixing seat 301 and is equipped with multiple groups of first connecting pipes 302. The mixing mechanism 3 is connected to the raw material barrel 2 through the first connecting pipe 302. Multiple groups of second connecting pipes 303 are installed on the top of the mixing mechanism 3. The reflux pipe 9 is connected to the mixing mechanism 3 through the second connecting pipe 303. Four groups of reflux pipes 9 are installed on the outside of the mixing mechanism 3, and the reflux pipe 9 extends to the bottom of the stirring tank 1. After exhausting, the remaining airflow can be introduced into the inside of the stirring tank 1, so that the airflow can clean the raw materials settled at the bottom and fully mix the raw materials. An exhaust port is opened at the top of the mixing mechanism 3, which is located in the middle of the multiple groups of second connecting pipes 303. The exhaust cover plate 4 is located above the exhaust port. A guide rod 5011 is installed in the middle of the rotating shaft 501. The guide rod 5 The top and bottom of 011 are both installed with a lower gear ring 5012 and an upper gear ring 5013, the guide rod 5011 is located on the inner side of the inner support frame 7, and a mixing disk 6 is installed on the outer side of the inner support frame 7. The mixing disk 6 includes a gear 601, a connecting rod 602 and a twisted iron rod 603, the gear 601 is meshed with the lower gear ring 5012 and the upper gear ring 5013, the twisted iron rod 603 is aligned with the first connecting pipe 302, a slot is provided at the top of the inner support frame 7, and the top of the inner support frame 7 is located below the flow fan blades 503, the baffle plate 8 connected to the bottom end of the inner support frame 7 is wider than the opening at the bottom end of the mixing mechanism 3, and can stir and disperse the injected raw materials through the mixing disk 6 during the injection process, thereby improving the mixing effect, and the baffle plate 8 can not only reduce the speed of the raw materials impacting the mixture and reduce the splashing of water, but also can reduce the splashing of water generated during the stirring process into the mixing mechanism 3.

[0031] See also Fig. 9 A fixed plate 401 is installed inside the mixing mechanism 3, and a movable rod 402 and a protruding edge 403 are connected to the bottom end of the exhaust cover plate 4. A groove is provided at the top of the mixing mechanism 3, and the exhaust cover plate 4 is engaged with the groove through the movable rod 402. A spring sleeve 404 is connected to the top of the fixed plate 401, and the movable rod 402 is inserted into the inside of the spring sleeve 404, which can conveniently limit the exhaust cover plate 4 and facilitate the discharge of gas from the stirring tank 1.

[0032] In the above embodiments, please refer to Figure 7 The lower tooth ring 5012 and the upper tooth ring 5013 are semi-ring structures, and the lower tooth ring 5012 and the upper tooth ring 5013 are staggered, which is convenient for driving the mixing disk 6 to rotate in different directions, thereby improving the crushing of the raw materials.

[0033] During assembly, first install the motor 5 below the stirring tank 1, insert the rotating shaft 501 into the stirring tank 1, insert the inner support frame 7 into the outer side of the rotating shaft 501, and fix the inner support frame 7. At this time, the gear 601 is meshed with the lower gear ring 5012, and each group of mixing disks 6 is installed to the outer side of the rotating shaft 501. Then, the upper sleeve is installed to the outer side of the rotating shaft 501, and the upper gear ring 5013 is connected to the top of the gear 601. The flow blade 503 is installed on the outer side of the sleeve, and then the fixing rod is inserted into the sleeve to fix the sleeve to complete the flow blade 50 3 is installed, and then the mixing mechanism 3 is installed above the top plate 101, and the mixing mechanism 3 is fixed by bolts and the fixing seat 301, and the exhaust cover plate 4 is aligned with the flow fan blade 503, and then each group of return pipes 9 are installed on the outside of the stirring tank 1, the top end of the return pipe 9 is connected to the second connecting pipe 303, and the bottom end of the return pipe 9 is connected to the bottom end of the stirring tank 1, and then the support frame 102 is installed above the top plate 101, and then the raw material barrel 2 is installed in the support frame 102, and the insert pipe 204 is inserted into the first connecting pipe 302, so that the assembly of the raw material barrel 2 is realized.

[0034] During use, each group of raw materials is injected into the mixing tank 1 through the raw material barrel 2. During the injection process, the motor 5 is first started, and the motor 5 drives each group of rotating shafts 501 to rotate. At this time, the rotating shaft 501 will drive the gear 601 to rotate forward and reverse through the lower gear ring 5012 and the upper gear ring 5013. At this time, the cannula 204 is opened by controlling the valve 205, and the raw materials fall into the mixing mechanism 3 through the raw material barrel 2. At this time, the mixing disk 6 that rotates forward and reverse rotates, and the twisted iron rod 603 breaks the raw materials. The broken raw materials fall on the baffle plate 8, fall on, and finally fall into the mixing tank 1. The rotating shaft 501 drives the stirring blades 502 and the flow blades 503 to rotate, and the stirring blades 502 will mix and stir the raw materials. During the stirring process, During the stirring process, the rotating shaft 501 will drive the top flow blade 503 to rotate, and the flow blade 503 will drive the upward airflow, so that the air pressure at the top position of the mixing mechanism 3 increases, and the airflow will push the fixed plate 401 to pull the spring sleeve 404 to move upward, so that part of the air in the stirring tank 1 is discharged, and the air pressure in the stirring tank 1 is reduced. When the air pressure reaches a suitable range, the spring sleeve 404 pulls the exhaust cover plate 4 back to continue to seal the stirring tank 1, and at this time, the flow blade 503 continues to drive the airflow to flow, thereby injecting the airflow into the bottom of the stirring tank 1 through the return pipe 9, so that the airflow enters the stirring tank 1 from below, thereby further blowing up the raw materials that have settled on the bottom, facilitating further mixing and stirring of the raw materials, and improving the stirring effect; After stirring is completed, the mixed viscous fracturing fluid is discharged through the discharge port 103. After discharge, the inside of the stirring tank 1 needs to be cleaned. At this time, water is injected into the stirring tank 1 until the water overflows the second connecting pipe 303, and the motor 5 is started in reverse. The motor 5 drives the rotating shaft 501 to rotate in the opposite direction. At this time, the stirring blades 502 and the flow blades 503 are driven to rotate in the opposite direction, driving the water to flow downward. The water flows into the mixing mechanism 3 through the reflux pipe 9, and the inside of the mixing mechanism 3 is cleaned, thereby cleaning the inside of the equipment.

[0035] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A dry powder variable viscosity fracturing fluid continuous mixing device, comprising a stirring tank (1), characterized in that: Four groups of raw material barrels (2) and one group of mixing mechanisms (3) are installed at the top of the mixing tank (1). The raw material barrels (2) are connected to the mixing mechanisms (3) through pipelines. An exhaust cover plate (4) is installed at the top of the mixing mechanism (3). The exhaust cover plate (4) is sealed and fitted with the top of the mixing mechanism (3). When the internal air pressure of the mixing mechanism (3) increases, the exhaust cover plate (4) moves upward. A motor (5) is installed at the bottom of the mixing tank (1). The output end of the motor (5) is connected to a rotating shaft (501). The rotating shaft (501) passes through the mixing tank (1) and extends to the inside of the mixing mechanism (3). A stirring fan is installed on the outside of the rotating shaft (501). The stirring blade (502) and the flow blade (503) are arranged inside the stirring tank (1), the flow blade (503) is arranged inside the mixing mechanism (3), and the flow blade (503) is arranged above the connection port of the raw material barrel (2); the outer wall of the rotating shaft (501) is provided with a stirring structure, and the stirring structure mixes the raw materials entering; the mixing mechanism (3) is provided with an inner support frame (7), and the bottom end of the inner support frame (7) extends to the inside of the stirring tank (1) and is provided with a baffle plate (8); the outer side of the mixing mechanism (3) is provided with four groups of return pipes (9), and the return pipes (9) extend to the bottom end of the stirring tank (1).

2. A dry powder variable viscosity fracturing fluid continuous mixing device according to claim 1, characterized in that: A top plate (101) is installed at the top of the stirring tank (1), the raw material barrel (2) and the mixing mechanism (3) are located above the top plate (101), a support frame (102) is also installed at the top of the stirring tank (1), the raw material barrel (2) is fixed inside the support frame (102), and a discharge port (103) and two groups of supporting legs (104) are connected to the side of the stirring tank (1), and the two groups of supporting legs (104) are symmetrically arranged.

3. A dry powder variable viscosity fracturing fluid continuous mixing device according to claim 1, characterized in that: A cover plate (201) is installed at the top end of the raw material barrel (2), a rotating shaft (202) is connected to the side of the cover plate (201), the cover plate (201) is rotatably connected to the raw material barrel (2) via the rotating shaft (202), a handle (203) is connected to the top end of the cover plate (201), a plug (204) is installed at the bottom end of the raw material barrel (2), the plug (204) is connected to the mixing mechanism (3), and a control valve (205) is installed inside the plug (204), and the control valve (205) controls the flow of the plug (204).

4. A dry powder variable viscosity fracturing fluid continuous mixing device according to claim 1, characterized in that: A fixing seat (301) is installed on the outer side of the mixing mechanism (3), and the mixing mechanism (3) is fixedly connected to the stirring tank (1) via the fixing seat (301). A plurality of first connecting pipes (302) are installed on the mixing mechanism (3) above the fixing seat (301). The mixing mechanism (3) is connected to the raw material barrel (2) via the first connecting pipes (302). A plurality of second connecting pipes (303) are installed on the top of the mixing mechanism (3). The reflux pipe (9) is connected to the mixing mechanism (3) via the second connecting pipe (303). An exhaust port is opened at the top of the mixing mechanism (3) in the middle of the plurality of second connecting pipes (303), and an exhaust cover plate (4) is located above the exhaust port.

5. A dry powder variable viscosity fracturing fluid continuous mixing device according to claim 1, characterized in that: A fixing plate (401) is installed inside the mixing mechanism (3); a movable rod (402) and a protruding edge (403) are connected to the bottom end of the exhaust cover plate (4); a groove is provided at the top end of the mixing mechanism (3); the exhaust cover plate (4) is engaged with the groove via the movable rod (402); a spring sleeve (404) is connected to the top end of the fixing plate (401); and the movable rod (402) is inserted into the interior of the spring sleeve (404).

6. A dry powder variable viscosity fracturing fluid continuous mixing device according to claim 4, characterized in that: A guide rod (5011) is installed in the middle of the rotating shaft (501), and a lower gear ring (5012) and an upper gear ring (5013) are installed at the top and bottom of the guide rod (5011). The guide rod (5011) is located on the inner side of the inner support frame (7), and a mixing disk (6) is installed on the outer side of the inner support frame (7). The mixing disk (6) includes a gear (601), a connecting rod (602), and a twisted iron rod (603). The gear (601) is meshed with the lower gear ring (5012) and the upper gear ring (5013), and the twisted iron rod (603) is aligned with the first connecting pipe (302).

7. A dry powder variable viscosity fracturing fluid continuous mixing device according to claim 6, characterized in that: The lower gear ring (5012) and the upper gear ring (5013) are semi-ring structures, and the lower gear ring (5012) and the upper gear ring (5013) are arranged in an alternating manner.

8. A dry powder variable viscosity fracturing fluid continuous mixing device according to claim 1, characterized in that: The top end of the inner support frame (7) is provided with a slot, and the top end of the inner support frame (7) is located below the flow blade (503), and the shielding plate (8) connected to the bottom end of the inner support frame (7) is wider than the opening at the bottom end of the mixing mechanism (3).

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