A mixing device and method for preparing fracturing fluid using polymer dry powder

Abstract

The present invention discloses a polymer dry powder preparation fracturing fluid mixing device and method, including a powder hopper, a premixing tube, a high-pressure water pipe, a high-pressure pump, a body and a shear emulsification pump, the powder hopper is connected to the premixing tube, the premixing tube is connected to the shear emulsification pump, and the outlet side of the shear emulsification pump is connected to the finished product output pipe; the water outlet end of the high-pressure water pipe is nested in the premixing tube to form an annular powder channel, and the water inlet end of the high-pressure water pipe is connected to the high-pressure pump; the outside of the high-pressure water pipe is provided with a powder channel on-off mechanism; the lower end of the high-pressure water pipe is provided with a kinetic energy collection and stirring mechanism. It also includes the mixing method of S1-S6. An annular powder channel is formed between the high-pressure water pipe and the premixing tube of the present invention, and the annular powder channel can evenly distribute the dry powder ring around the circumference of the high-pressure water pipe, and the Venturi effect generated by the high-pressure water passing through the end of the high-pressure water pipe is used to continuously inhale the dry powder circumferentially, so that the dry powder has a greater contact with water, is less likely to produce agglomeration, and has a better dry powder online mixing effect.

Description

Technical Field

[0001] The invention relates to the technical field of fracturing fluid mixing equipment, and in particular to a mixing device and method for preparing fracturing fluid with polymer dry powder. Background Art

[0002] Fracturing fluid is a chemical liquid used in the process of fracturing and reforming oil and gas layers. Its main function is to transfer the high pressure formed by ground equipment to the formation, so that the formation breaks and forms cracks, and transports proppants along the cracks. Fracturing fluid is a heterogeneous and unstable chemical system formed by a variety of additives in a certain ratio. It is mainly used in the process of oil fracturing to open the formation through pressure, form cracks and support them with proppants to reduce the resistance of fluid flow, thereby achieving the effect of increasing production and injection.

[0003] The existing online preparation method of fracturing fluid mainly uses the Venturi effect generated by the processing liquid to bring in dry powder (guar gum), and uses the negative pressure generated by the processing liquid to pre-mix the dry powder with the processing liquid, and then uses a shear emulsification pump to shear and emulsify to form a finished product, such as a flash mix-powder / liquid mixer. However, the existing online preparation equipment of fracturing fluid generally has only one dry powder feed pipe, which is installed on the side of the processing liquid pipeline. The dry powder enters the processing liquid pipeline from one side, which makes the contact area between the processing liquid and the powder small. The dry powder that is not fully dispersed is easy to agglomerate after contacting with water. Although the two are mixed and stirred at high speed in the discharge pipeline, a large amount of powder is still not dispersed, forming a fish-eye-shaped mixture of rubber-coated dry powder, which cannot be dissolved in water and thickens the viscosity of the base fluid. Moreover, the agglomeration will seriously affect the quality of the finished product after passing through the shear emulsification pump. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a mixing device and method for preparing fracturing fluid with polymer dry powder.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0006] Provided are a mixing device and method for preparing fracturing fluid with polymer dry powder, comprising a powder hopper, a premixing tube, a high-pressure water pipe, a high-pressure pump, a body and a shear emulsification pump, wherein the bottom discharge port of the powder hopper is connected to the premixing tube, the lower side of the premixing tube is connected to the inlet end of the shear emulsification pump, and the outlet end of the shear emulsification pump is connected to a finished product output pipe; the water outlet end of the high-pressure water pipe is nested in the premixing tube, the water inlet end of the high-pressure water pipe is connected to the high-pressure pump, and an annular powder channel is formed between the high-pressure water pipe and the premixing tube; a kinetic energy collection and stirring mechanism is provided at the outlet end of the high-pressure water pipe, and the kinetic energy collection and stirring mechanism is used to stir the mixed powder and water sucked in.

[0007] Furthermore, a powder channel opening and closing mechanism for isolating the annular powder channel is provided on the outside of the high-pressure water pipe. The powder channel opening and closing mechanism includes a sliding telescopic sleeve and a telescopic device installed on the outside of the high-pressure water pipe. A rubber sealing ring that cooperates with the annular powder channel is fixed to the bottom of the sliding telescopic sleeve. The outer diameter of the rubber sealing ring is larger than the outer diameter of the annular powder channel.

[0008] Furthermore, the telescopic device is a hydraulic rod, a gas rod, an electric push rod or a threaded lift.

[0009] Furthermore, it also includes a vibration mechanism, which includes a plurality of vibration rods and a vibration bracket, the vibration bracket is fixedly connected to the machine body, a vibration through hole for installing the vibration rod is set on the vibration bracket, a rubber sleeve for fixing the vibration rod is set in the vibration through hole, and the bottom of the vibration rod is located in the powder hopper.

[0010] Furthermore, the kinetic energy collection and stirring mechanism includes a collection turbofan, a collection shaft and a stirring turbine. The collection turbofan and the collection shaft are respectively fixed at the upper and lower ends of the collection shaft. The collection turbofan is located on the inner side of the water outlet end of the high-pressure water pipe, and the stirring turbine is located on the outer side of the water outlet end of the high-pressure water pipe. The collection shaft is installed in the high-pressure water pipe through an upper shaft bracket and a lower shaft bracket. The upper shaft bracket and the lower shaft bracket are cross brackets or herringbone brackets. The upper shaft bracket and the lower shaft bracket are provided with through holes for installing the collection shaft. The collection shaft is provided with an upper limit ring portion that cooperates with the upper side of the upper shaft bracket and a lower limit ring portion that cooperates with the lower side of the lower shaft bracket.

[0011] Furthermore, bearings rotatably connected to the collection shaft are provided on both the upper shaft bracket and the lower shaft bracket.

[0012] Furthermore, the high-pressure water pipe is provided with an inner contraction portion, and the premixing pipe is provided with an outer contraction portion matching the inner contraction portion, and the inner diameter of the outer contraction portion is equal to the inner diameter of the high-pressure water pipe.

[0013] Furthermore, the powder hopper includes a material guide cover, a vibration cylinder and a material guide cylinder which are arranged in sequence from top to bottom, the material guide cover is provided with a hopper cover, the hopper cover is provided with a feed port, and the inner diameter of the vibration cylinder is larger than the outer diameter of the annular powder channel.

[0014] Furthermore, a plurality of supporting spacers are arranged on the annular powder channel, each supporting spacer is fixedly connected to the premixing pipe or the high-pressure water pipe, and the supporting spacer is in the shape of a long strip.

[0015] Furthermore, it also includes a screw conveyor, and the discharge port of the screw conveyor is located above the powder hopper.

[0016] A mixing method for preparing a fracturing fluid mixing device using polymer dry powder comprises the following steps:

[0017] S1: Before mixing, turn on the high-pressure pump and the shear emulsification pump to form negative pressure at the output end of the high-pressure water pipe;

[0018] S2: Power on the vibrating rod, and use the vibration generated by the vibrating rod to vibrate the powder added to the subsequent powder hopper;

[0019] S3: Dry powder is transported to the powder hopper through the feed port, and the powder is evenly filled in the guide cover, vibration cylinder and guide cylinder of the powder hopper under the vibration of the vibrating rod;

[0020] S4: When performing online mixing, the telescopic device drives the sliding telescopic sleeve to rise to the highest point, so that the rubber sealing ring is separated from the upper end of the annular powder channel, so that the powder hopper is connected with the annular powder channel, and the powder can continuously pass through the annular powder channel into the pre-mixing tube in cooperation with the vibrating rod;

[0021] S5: During mixing, high-pressure water is continuously output through the inner contraction of the high-pressure water pipe. When the high-pressure water passes through the inner contraction, negative pressure is generated on the outer side of the inner contraction, and the powder in the annular powder channel is sucked around the high-pressure water, so that the powder is fully in contact with the high-pressure water; at the same time, the kinetic energy collection and stirring mechanism collects kinetic energy through the high-pressure water, and uses the collected kinetic energy to stir and mix the powder and the high-pressure water. Specifically, the collection turbofan transmits the collected rotation to the stirring turbine through the collection shaft, and the stirring turbine stirs and mixes the outflowing powder and the high-pressure water. The fully mixed powder and high-pressure water enter the shear emulsification pump, and the powder and the high-pressure water are further mixed and processed;

[0022] S6: Finally, the finished product processed by the emulsification pump is output through the finished product output pipe.

[0023] The beneficial effects of the present invention are:

[0024] The present invention arranges a high-pressure water pipe sleeve on the outside of the premixing pipe to form an annular powder channel between the high-pressure water pipe and the premixing pipe. The annular powder channel can evenly distribute the dry powder in the circumference of the high-pressure water pipe, and utilizes the Venturi effect generated by the high-pressure water passing through the end of the high-pressure water pipe, that is, negative pressure is generated at the end of the high-pressure water pipe, so that the dry powder in the annular powder channel is continuously sucked in the circumferential direction. The dry powder can contact with water in a more dispersed manner, and the contact area between the two is larger, so that it is less likely to generate lumps. The dry powder and water are more fully mixed in this structure, and a better dry powder online mixing effect is achieved.

[0025] The high-pressure water pipe end and the premixing pipe inlet end of the present invention are provided with a kinetic energy collection and stirring mechanism, which includes a collection turbofan, a collection shaft and a stirring turbine. The collection turbofan can collect the kinetic energy of the high-pressure water in the high-pressure water pipe, and transmit the collected rotation to the stirring turbine through the collection shaft. On the one hand, the stirring turbine generates a vortex to further rotate and stir the mixed dry powder and water to ensure that the dispersed dry powder and water are fully mixed; on the other hand, the rotation of the stirring turbine can be used to break up the lumps and reduce the size and volume of the lumps, thereby ensuring the subsequent shear emulsification effect.

[0026] The upper end of the annular powder channel of the present invention is provided with a powder channel on-off mechanism, which includes a sliding telescopic sleeve, a rubber sealing ring and a telescopic device. The sliding telescopic sleeve is driven to slide on the high-pressure water pipe by the telescopic device, so that the rubber sealing ring is used to control the on-off of the annular powder channel, thereby facilitating the control of the powder hopper's feeding of the annular powder channel.

[0027] The powder hopper of the present invention comprises a material guide cover, a vibration cylinder and a material guide cylinder. A vibration rod is arranged in the powder hopper, and the lower end of the vibration rod is located in the vibration cylinder. The vibration rod can continuously vibrate and transport the dry powder in the powder hopper to the annular powder channel, thereby ensuring that the dry powder is fully mixed with water through the annular powder channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the present invention with the hopper cover removed;

[0030] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0031] Figure 4 It is a schematic diagram of the internal structure of the present invention;

[0032] Figure 5 for Figure 4 A partial enlarged view of point B in

[0033] Figure 6 It is a structural schematic diagram of the kinetic energy collection and stirring mechanism;

[0034] Figure 7 It is a structural schematic diagram of another embodiment of the present invention;

[0035] The main components in the figure are described as follows:

[0036] 1. Powder hopper; 11. Material guide cover; 12. Vibrating cylinder; 13. Material guide cylinder; 14. Hopper bracket; 15. Hopper cover;

[0037] 2. High-pressure water pipe; 21. Inner contraction; 22. Kinetic energy collection and stirring mechanism; 221. Collection turbofan; 222. Collection shaft; 223. Stirring turbine; 224. Upper shaft bracket; 225. Lower shaft bracket; 23. Annular powder channel;

[0038] 3. premixing tube; 31. outer shrinkage portion; 32. supporting spacer;

[0039] 4. Powder channel on-off mechanism; 41. Sliding telescopic sleeve; 42. Rubber sealing ring; 43. Telescopic device;

[0040] 5. Vibration mechanism; 51. Vibration bracket; 52. Vibration rod; 6. High-pressure pump; 7. Machine body;

[0041] 8. Shear emulsification pump; 81. Finished product output pipe;

[0042] 9. Screw conveyor; 91. Main conveying pipe; 92. Feeding hopper; 93. Branch output pipe; 94. Conveying motor. DETAILED DESCRIPTION

[0043] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0044] like Figure 1 and 2 As shown, a powder hopper 1, a premixing tube 3, a high-pressure water pipe 2, a high-pressure pump 6, a machine body 7 and a shearing emulsification pump 8, the bottom discharge port of the powder hopper 1 is connected to the premixing tube 3, the lower side of the premixing tube 3 is connected to the inlet end of the shearing emulsification pump 8, and the outlet end of the shearing emulsification pump 8 is connected to the finished product output pipe 81.

[0045] like Figure 3 , 4 As shown in Figure 5, the water outlet end of the high-pressure water pipe 2 is nested in the premixing tube 3, the water inlet end of the high-pressure water pipe 2 is connected to the high-pressure pump 6, and an annular powder channel 23 is formed between the high-pressure water pipe 2 and the premixing tube 3. A plurality of supporting blocks 32 are arranged on the annular powder channel 23. The length direction of the supporting blocks 32 is the same as the axial direction of the water outlet end of the high-pressure water pipe 2. Each supporting block 32 is fixedly connected to the premixing tube 3 or the high-pressure water pipe 2. The supporting blocks 32 are in the shape of long strips. The supporting blocks 32 are beneficial to supporting and fixing the water outlet end of the high-pressure water pipe 2, ensuring the concentricity of the annular powder channel 23, and facilitating the up and down sliding of the powder channel switching mechanism 4.

[0046] The powder hopper 1 includes a material guide cover 11, a vibration cylinder 12 and a material guide cylinder 13 which are arranged in sequence from top to bottom. A hopper cover 15 is arranged on the material guide cover. A feed port is arranged on the hopper cover 15. The feed port is used to connect a pipeline for conveying dry powder, so as to continuously convey dry powder to the powder hopper 1. An opening for cooperating with the high-pressure water pipe 2 and a through hole for cooperating with the vibration rod 52 are arranged on the hopper cover 15. The powder hopper 1 adopts a sealing design to ensure that the processing environment is not affected by the outside world. The inner diameter of the vibration cylinder 12 is larger than the outer diameter of the annular powder channel 23, and the material guide cylinder 13 is in the shape of a truncated table. A hopper bracket 14 for mounting the powder hopper 1 is arranged on the machine body 7. The hopper bracket 14 is fixedly connected to the machine body 7. The hopper bracket 14 is C-shaped and is fixedly connected to the outside of the vibration cylinder 12.

[0047] The outside of the high-pressure water pipe 2 is provided with a powder channel on-off mechanism 4 for isolating the annular powder channel 23. The powder channel on-off mechanism 4 includes a sliding telescopic sleeve 41 and a telescopic device 43 installed on the outside of the high-pressure water pipe 2. A rubber sealing ring 42 that cooperates with the annular powder channel 23 is fixed to the bottom of the sliding telescopic sleeve 41. The rubber sealing ring 42 is bonded or fixed to the bottom of the sliding telescopic sleeve 41 by limiting. The outer diameter of the rubber sealing ring 42 is larger than the outer diameter of the annular powder channel 23. The outer side of the bottom of the rubber sealing ring 42 can be set to a chamfer that cooperates with the guide barrel 13, and the line seal is changed into a surface seal, thereby improving the sealing between the rubber sealing ring 42 and the guide barrel 13, so as to achieve a better on-off effect. The telescopic device 43 is a hydraulic rod, a gas rod, an electric push rod or a threaded elevator. A reciprocating connecting rod mechanism can also be used, which can realize the up and down movement control of the powder channel on-off mechanism 4.

[0048] The machine body 7 further includes a vibration mechanism 5, which includes a plurality of vibration rods 52 and a vibration bracket 51. The vibration bracket 51 is fixedly connected to the machine body 7. A through hole for installing the vibration rod 52 is provided on the vibration bracket 51. The vibration rod 52 is installed in the vibration through hole. A rubber sleeve for fixing the vibration rod 52 is provided in the vibration through hole. The vibration rod 52 is fixed in the through hole of the vibration bracket 51 through the rubber sleeve. The bottom of the vibration rod 52 is located in the vibration cylinder 12 of the powder hopper 1. The vibration rod 52 can continuously vibrate and transport the dry powder in the powder hopper 1 to the annular powder channel 23, so as to ensure that the dry powder is fully mixed with water through the annular powder channel 23.

[0049] like Figure 4 As shown, the high-pressure water pipe 2 is provided with an inner contraction portion 21 , and the premixing tube 3 is provided with an outer contraction portion 31 matching the inner contraction portion 21 , and the inner diameter of the outer contraction portion 31 is equal to the inner diameter of the high-pressure water pipe 2 .

[0050] like Figure 6As shown, a kinetic energy collection and stirring mechanism 22 is provided at the outlet end of the high-pressure water pipe 2, and the kinetic energy collection and stirring mechanism 22 is used to stir the mixed powder and water. The kinetic energy collection and stirring mechanism 22 includes a collection turbofan 221, a collection shaft 222 and a stirring turbine 223. The collection turbofan 221 and the collection shaft 222 are respectively fixed at the upper end and the lower end of the collection shaft 222. The collection turbofan 221 is located on the inner side of the water outlet end of the high-pressure water pipe 2, and the stirring turbine 223 is located on the outer side of the water outlet end of the high-pressure water pipe 2. The collection shaft 222 is installed in the high-pressure water pipe 2 through an upper shaft bracket 224 and a lower shaft bracket 225. The collection turbofan 221 is preferably a turbofan with high collection efficiency, and the stirring turbine 223 is preferably a pagoda-shaped turbine with the small end of the turbine installed upward. The upper rotating shaft bracket 224 and the lower rotating shaft bracket 225 are cross brackets or herringbone brackets. The upper rotating shaft bracket 224 and the lower rotating shaft bracket 225 are provided with through holes for installing the collection rotating shaft 222. The collection rotating shaft 222 is provided with an upper limit ring part that cooperates with the upper side of the upper rotating shaft bracket 224 and a lower limit ring part that cooperates with the lower side of the lower rotating shaft bracket 225. Further, the upper rotating shaft bracket 224 and the lower rotating shaft bracket 225 are both provided with bearings that are rotatably connected to the collection rotating shaft 222. The bearings can be thrust bearings, ball bearings or sliding bearings. Among them, a thrust bearing is provided between the upper rotating shaft bracket 224 and the collection rotating shaft 222, and the transmission effect is the best solution. The bearing between the lower rotating shaft bracket 225 and the collection rotating shaft 222 is preferably a thrust roller bearing.

[0051] In another embodiment, if Figure 7 As shown, the dry powder can be conveyed to the powder hopper 1 by means of a screw conveyor 9, and the discharge end of the screw conveyor 9 is located above the powder hopper 1. The screw conveyor 9 is used to convey the powder to the powder hopper 1, and the screw conveyor 9 comprises a main conveying pipe 91, a conveying motor 94 and a spiral blade, the spiral blade is installed in the main conveying pipe 91, and the spiral blade is connected to the output end of the conveying motor 94, a feeding hopper 92 is arranged on the bottom feed port of the main conveying pipe 91, and a branch output pipe 93 is arranged at the top discharge port of the main conveying pipe 91.

[0052] A mixing method for preparing a fracturing fluid mixing device using polymer dry powder comprises the following steps:

[0053] S1: Before mixing, turn on the high-pressure pump 6 and the shear emulsification pump 8 to form a negative pressure at the output end of the high-pressure water pipe 2;

[0054] S2: Powering on the vibration rod 52, and utilizing the vibration generated by the vibration rod 52 to vibrate the powder added to the subsequent powder hopper 1;

[0055] S3: Dry powder is delivered to the powder hopper 1 through the feed port, and the powder is evenly filled in the guide cover 11, the vibration cylinder 12 and the guide cylinder 13 of the powder hopper 1 under the vibration of the vibration rod 52;

[0056] S4: When performing online mixing, the telescopic device 43 drives the sliding telescopic sleeve 41 to rise to the highest point, so that the rubber sealing ring 42 is separated from the upper end of the annular powder channel 23, so that the powder hopper 1 is connected with the annular powder channel 23, and the vibration rod 52 cooperates to allow the powder to continuously pass through the annular powder channel 23 and enter the pre-mixing tube 3;

[0057] S5: During mixing, high-pressure water is continuously output through the inner constriction portion 21 of the high-pressure water pipe 2. When the high-pressure water passes through the inner constriction portion 21, negative pressure is generated on the outer side of the inner constriction portion 21, and the powder in the annular powder channel 23 is sucked around the high-pressure water, so that the powder is fully in contact with the high-pressure water; at the same time, the kinetic energy collection and stirring mechanism 22 collects kinetic energy through the high-pressure water, and uses the collected kinetic energy to stir and mix the powder and the high-pressure water. Specifically, the collection turbofan 221 transmits the collected rotation to the stirring turbine 223 through the collection shaft 222, and the stirring turbine 223 stirs and mixes the outflowing powder and the high-pressure water. The fully mixed powder and high-pressure water enter the shear emulsification pump 8, and the powder and the high-pressure water are further mixed and processed;

[0058] S6: Finally, the finished product processed by the emulsifying pump 8 is output through the finished product output pipe 81.

Claims

1. A mixing device for preparing fracturing fluid with polymer dry powder, characterized in that: It comprises a powder hopper (1), a premixing tube (3), a high-pressure water pipe (2), a high-pressure pump (6), a body (7) and a shearing emulsification pump (8), wherein the bottom discharge port of the powder hopper (1) is connected to the premixing tube (3), the lower side of the premixing tube (3) is connected to the inlet end of the shearing emulsification pump (8), and the outlet end of the shearing emulsification pump (8) is connected to a finished product output pipe (81); The water outlet end of the high-pressure water pipe (2) is nested in the pre-mixing pipe (3), the water inlet end of the high-pressure water pipe (2) is connected to the high-pressure pump (6), and an annular powder channel (23) is formed between the high-pressure water pipe (2) and the pre-mixing pipe (3); The outlet end of the high-pressure water pipe (2) is provided with a kinetic energy collection and stirring mechanism (22), and the kinetic energy collection and stirring mechanism (22) is used to stir the mixed powder and water; A powder channel on-off mechanism (4) for isolating the annular powder channel (23) is arranged outside the high-pressure water pipe (2), the powder channel on-off mechanism (4) comprising a sliding telescopic sleeve (41) and a telescopic device (43) mounted outside the high-pressure water pipe (2), a rubber sealing ring (42) matching the annular powder channel (23) being fixed to the bottom of the sliding telescopic sleeve (41), the outer diameter of the rubber sealing ring (42) being larger than the outer diameter of the annular powder channel (23); The high-pressure water pipe (2) is provided with an inner contraction portion (21), and the premixing pipe (3) is provided with an outer contraction portion (31) matching the inner contraction portion (21), and the inner diameter of the outer contraction portion (31) is equal to the inner diameter of the high-pressure water pipe (2).

2. The mixing device for preparing fracturing fluid with polymer dry powder according to claim 1, characterized in that: The telescopic device (43) is a hydraulic rod, a gas rod, an electric push rod or a threaded lift.

3. The mixing device for preparing fracturing fluid with polymer dry powder according to claim 1, characterized in that: The machine also comprises a vibration mechanism (5), the vibration mechanism (5) comprising a plurality of vibration rods (52) and a vibration bracket (51), the vibration bracket (51) being fixedly connected to the machine body (7), the vibration bracket (51) being provided with a through hole for mounting the vibration rod (52), the vibration rod (52) being mounted in the vibration through hole, a rubber sleeve for fixing the vibration rod (52) being provided in the vibration through hole, and the bottom of the vibration rod (52) being located in the powder hopper (1).

4. The mixing device for preparing fracturing fluid with polymer dry powder according to claim 3, characterized in that: The kinetic energy collection and stirring mechanism (22) comprises a collection turbofan (221), a collection rotating shaft (222) and a stirring turbine (223); the collection turbofan (221) and the stirring turbine (223) are respectively fixed to the upper end and the lower end of the collection rotating shaft (222); the collection turbofan (221) is located on the inner side of the water outlet end of the high-pressure water pipe (2); the stirring turbine (223) is located on the outer side of the water outlet end of the high-pressure water pipe (2); and the collection rotating shaft (222) is installed in the high-pressure water pipe (2) via an upper rotating shaft bracket (224) and a lower rotating shaft bracket (225).

5. The mixing device for preparing fracturing fluid with polymer dry powder according to claim 4, characterized in that: The upper rotating shaft bracket (224) and the lower rotating shaft bracket (225) are both provided with bearings rotatably connected to the collection rotating shaft (222).

6. The mixing device for preparing fracturing fluid with polymer dry powder according to claim 5, characterized in that: The powder hopper (1) comprises a material guide cover (11), a vibration cylinder (12) and a material guide cylinder (13) which are arranged in sequence from top to bottom; a hopper cover (15) is arranged on the material guide cover (11), and a feed port is arranged on the hopper cover (15); the inner diameter of the vibration cylinder (12) is larger than the outer diameter of the annular powder channel (23).

7. The mixing device for preparing fracturing fluid with polymer dry powder according to claim 6, characterized in that: A plurality of supporting spacers (32) are provided on the annular powder channel (23), each of the supporting spacers (32) being fixedly connected to a premixing tube (3) or a high-pressure water pipe (2), and the supporting spacers (32) are in the shape of long strips.

8. A mixing method for preparing a fracturing fluid mixing device using the polymer dry powder according to claim 7, characterized in that: The steps include: S1: Before mixing, turn on the high-pressure pump (6) and the shear emulsification pump (8) to form a negative pressure at the output end of the high-pressure water pipe (2); S2: energizing the vibration rod (52), and utilizing the vibration generated by the vibration rod (52) to vibrate the powder material subsequently added to the powder material hopper (1); S3: conveying dry powder to the powder hopper (1) through the feed port, and the powder is evenly filled into the material guide cover (11), the vibration cylinder (12) and the material guide cylinder (13) of the powder hopper (1) under the vibration of the vibration rod (52); S4: When performing online mixing, the telescopic device (43) drives the sliding telescopic sleeve (41) to rise to the highest point, allowing the rubber sealing ring (42) to separate from the upper end of the annular powder channel (23), so that the powder hopper (1) is connected to the annular powder channel (23), and the vibration rod (52) cooperates to allow the powder to continuously pass through the annular powder channel (23) and enter the pre-mixing tube (3); S5: During the mixing process, high-pressure water is continuously output through the inner contraction portion (21) of the high-pressure water pipe (2). When the high-pressure water passes through the inner contraction portion (21), negative pressure is generated outside the inner contraction portion (21), so that the powder in the annular powder channel (23) is sucked around the high-pressure water, so that the powder is fully in contact with the high-pressure water; at the same time, the kinetic energy collection and stirring mechanism (22) collects kinetic energy through the high-pressure water, and uses the collected kinetic energy to stir and mix the powder and the high-pressure water; Specifically, the collection turbofan (221) transmits the collection rotation to the stirring turbine (223) via the collection rotating shaft (222), and the stirring turbine (223) stirs and mixes the outflowing powder and high-pressure water. The fully mixed powder and high-pressure water enter the shear emulsification pump (8), and the powder and high-pressure water are further mixed and processed; S6: Finally, the finished product processed by the shearing emulsification pump (8) is output through the finished product output pipe (81).

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