High efficiency dual polymer dissolution device for field preparation of friction reducing agents

Abstract

The application relates to a high-efficiency double-polymer dissolving device for on-site preparation of friction-reducing agents, which comprises a movable pry seat, two or more fixed bins arranged in the movable pry seat, a feeding rack arranged on the movable pry seat, the upper end of the feeding rack being higher than the fixed bins, feeding holes corresponding to the lower openings of the movable bins being arranged on the feeding rack, a feeder connected to the upper ends of the fixed bins, an inverted conical opening at the lower part of the fixed bin connected to a metering screw device, the discharge of the metering screw device connected to a water-soluble polymer dispersing device, the upper and lower sides of the water-soluble polymer dispersing device respectively connected to first and second water inlet pipelines, branch valves and branch flow meters arranged on the first and / or second water inlet pipelines, the first and second water inlet pipelines jointly connected to a total water inlet pipeline, a water pump, a total valve and a total flow meter sequentially arranged on the total water inlet pipeline, and the discharge opening of the water-soluble polymer dispersing device connected to a sand mixer through a discharge pump. The device can meet the requirements of on-site preparation and dissolving operation, has the advantages of being suitable for feeding of movable bins, high-efficiency dissolving, one-use one-backup and adjustable dissolving supply.

Description

Technical Field

[0001] This invention relates to a dissolution system for the hydration of polymer powders in hydraulic fracturing operations, specifically a highly efficient dual-polymer dissolution device for the on-site preparation of friction reducers. Background Technology

[0002] Hydraulic fracturing operations require the use of friction reducers (FRs) to optimize fluid flow and minimize pressure loss. While dry polymer powders offer the advantages of high concentration and cost-effectiveness over traditional liquid emulsion-type drag reducers, their widespread application has been hampered by significant logistical and operational challenges, particularly in remote and harsh environments such as shale mining in China. Existing powder dissolution systems have severe limitations that restrict their application in the diverse and demanding fracturing sites in China.

[0003] Most current powder dissolving units are large, stationary, and therefore unsuitable for use in smaller, mountainous, and off-road areas, where many fracturing operations take place. Transporting these systems requires significant infrastructure, often impractical in remote areas. Furthermore, many such systems do not meet explosion-proof standards, which are crucial for safe operation in hazardous environments where flammable gases may be present. This non-compliance limits their use in high-risk areas, forcing operators to rely on liquid emulsion flame retardants as a safer alternative, despite their higher cost.

[0004] Another major drawback of traditional powder dissolution equipment is its inability to operate effectively in cold weather conditions. Most existing equipment lacks insulation, making it unsuitable for fracturing sites in northern China, where winter temperatures drop significantly. The absence of a built-in heating system hinders the effective dissolution of polymer powders, further impeding the transition to emulsion-based flame retardants. Furthermore, current powder dissolution equipment is designed as a centralized system without built-in redundancy. In the event of equipment failure, operators must use liquid emulsions as an emergency solution, increasing overall cost and complexity.

[0005] Furthermore, the adaptability of existing powder dissolution systems to different powder logistics methods is also a major limiting factor. Most equipment is designed for single polymer supply modes such as bulk silos, and this inflexible design complicates operation and increases costs, making it impractical for dynamic and remote fracturing sites that require more functionality.

[0006] Due to these technical and logistical limitations, most fracturing operations in China still rely on high-cost liquid emulsion barrier agents, despite their environmental disadvantages and high transportation costs. Currently, there is no dissolution equipment that fully meets the specific needs of fracturing sites in China, leading to increased chemical costs, lower operational efficiency, and logistical challenges. Summary of the Invention

[0007] To address these issues, this invention develops a compact, explosion-proof, highly mobile, and adaptable powder dissolution system. This novel design provides a practical and scalable solution for converting emulsion-based flame retardants to dry polymer flame retardants, significantly reducing operating costs, logistical complexity, and environmental impact.

[0008] The technical solution adopted in this invention is: a high-efficiency dual polymer dissolving device for on-site preparation of friction reducing agents, comprising a movable skid base, wherein two or more fixed silos are arranged inside the movable skid base, characterized in that: a feeding rack is provided on the movable skid base, the upper end of the feeding rack is higher than the fixed silos, the feeding rack is provided with feeding holes corresponding to the lower opening of the movable silos, the lower part of the movable silos is connected to a feeder at the upper end of the fixed silos, the lower conical opening of the fixed silos is connected to a metering screw device, the discharge of the metering screw device is connected to a water-soluble polymer dispersion device, the upper and lower sides of the water-soluble polymer dispersion device are respectively connected to a first and a second water inlet pipe, the first water inlet pipe and / or the second water inlet pipe are provided with branch valves and branch flow meters, the first and second water inlet pipes are connected to a main water inlet pipe, a water pump, a main valve and a main flow meter are sequentially arranged on the main water inlet pipe, and the discharge port of the water-soluble polymer dispersion device is connected to a sand mixer via a discharge pump.

[0009] Furthermore, the mobile hopper includes upper and lower hoppers connected vertically. A cover is installed at the upper inlet at the center of the upper end of the upper hopper. Three or more lifting lugs are evenly distributed around the circumference of the upper part or upper end of the upper hopper. An air valve connector is connected to the upper end of the upper hopper, and the air valve connector is connected to a drying filter. The lower hopper has an inverted conical structure. A lower outlet is located at the bottom of the inverted conical shape of the lower hopper. The outward tilt angle of the lower outlet is greater than the outward tilt angle of the side of the inverted conical shape of the lower hopper. The generatrix angle of the inverted conical shape of the lower hopper is greater than the generatrix angle of the lower outlet cone. A conical valve plug corresponding to the feeder is built into the lower hopper. A valve plug sealing ring is provided at the lower end of the conical valve plug, which is pressed against the inner wall of the lower outlet by its own weight. A flow-aiding top column is vertically connected to the top of the conical valve plug. The top of the flow-aiding top column has a conical structure, and one or more flow-aiding grooves are formed around the outer circumference of the flow-aiding top column under the conical structure. The outer wall of the inverted conical shape of the lower hopper is evenly distributed around its circumference. Four vertical support columns are connected to the bottom. Two support seats are respectively connected to the lower ends of two parallel support columns. The support seats have through-cavities for forklift arms to pass through. Shock absorbers are installed at the bottom of the support seats corresponding to the two support columns. Two parallel first and second reinforcing plates are connected to the upper end faces of the two support seats. The first and second reinforcing plates have openings in the middle and fit seamlessly onto the outer wall of the lower outlet of the conical valve plug at the corresponding valve plug sealing ring pressing position. The outer periphery of the first reinforcing plate is supported on the support seats at the lower ends of the two support columns by multiple circular plate legs around the circumference of the two support columns. The second reinforcing plate is supported on the first reinforcing plate by the circular plate legs of the first reinforcing plate at the position of the multiple circular plate legs around the circumference of the first reinforcing plate. Vibrators are provided on both the first and second reinforcing plates. One or more vibrators can be installed on the same reinforcing plate. Multiple vibrators can be arranged in two or more circularly symmetrically or evenly distributed on their respective reinforcing plates.

[0010] Furthermore, the water-soluble polymer dispersion device adopts the dispersion device of US20150352507A1, the discharge of the metering screw device is connected to the upper feed of the water-soluble polymer dispersion device, and the first and second water inlet pipes are connected to its primary water inlet and secondary water circuit, respectively.

[0011] Furthermore, the movable skid is an explosion-proof container structure, the container structure is an insulated box structure with a door, and the feeding rack is mounted on the upper part of the container structure.

[0012] Furthermore, the discharge pumps connected to the two or more fixed hoppers can be connected to a common discharge pipe, or each can be connected to a separate discharge pipe.

[0013] Furthermore, the discharge pump is a valve-operated pump.

[0014] Furthermore, the feeder is a conical discharge valve, and the conical structure of the conical discharge valve corresponds to the support of the conical valve plug.

[0015] Furthermore, the inner wall of the fixed hopper is coated with polytetrafluoroethylene, ceramic, or polyurethane.

[0016] Furthermore, the metering screw devices connected to the two or more fixed silos each have their discharge paths divided into two routes: one route connects to the water-soluble polymer dispersion device corresponding to each fixed silo, and the other route connects to two or more multi-port valves.

[0017] Furthermore, the lower discharge port of the fixed hopper is connected to a metering screw device via a hopper discharge valve.

[0018] Furthermore, the outer wall of the fixed hopper and / or the outer wall of the hopper discharge valve are provided with vibrators.

[0019] Furthermore, the metering screw device discharges material via a metering discharge valve and a hose connected to the upper end of the water-soluble polymer dispersion device; or the metering screw device discharges material via a metering discharge valve and a straight pipe connected to the upper end of the water-soluble polymer dispersion device.

[0020] Furthermore, the metering discharge valve is a three-way or higher valve. After the first inlet water pipe branch flow meter, it splits into two paths: one path is connected to the water-soluble polymer dispersion device via a valve, and the other path is connected to the metering discharge valve via a valve.

[0021] Furthermore, the metering discharge valve is also connected to an electrically heated hot air compression pipeline.

[0022] Furthermore, the side wall of the fixed hopper is connected to an electrically heated hot air compression pipeline.

[0023] Furthermore, an electric heater, an air filter, and an air compressor are sequentially arranged outwards on the air compression pipeline.

[0024] By adopting the above technical solution, the beneficial effects of the present invention are: 1. The mobile hopper can be directly lifted using lifting lugs or inserted into the through-cavity using a forklift arm, accommodating various transportation methods and enabling on-site transfer. The upper hopper has one or two air valve connectors, allowing for individual control of air intake after drying and also providing protective gas for humidity regulation of internally stored powder, preventing deterioration upon contact with air. A conical valve plug is installed at the lower outlet of the lower hopper. When the mobile hopper is moved and placed on the feeding rack corresponding to the feeder, the feeder extends a top head to lift the conical valve plug, causing the valve plug sealing ring at the bottom of the conical valve plug to disengage from the inner wall of the lower outlet. The powder stored in the hopper then falls through the gap between the valve plug sealing ring and the inner wall of the lower outlet into the fixed hopper. This automatic discharge process is highly efficient and eliminates dust disturbance to workers. A reinforcing plate is connected to the outer wall of the lower outlet of the lower hopper to strengthen and stabilize the inverted conical shape. The structure of the lower chamber is stable, and the vibration is transmitted to the lower outlet position through the vibration of the reinforcing plate by the vibrator, thereby effectively improving the gap discharge efficiency. The reinforcing plate can be set in two or more layers, which can further improve the discharge efficiency of material falling through the gap from the lower chamber. An auxiliary flow column is set at the top of the conical valve plug, which can break the powder accumulated at the top while the conical valve plug is pushed up. Combined with the auxiliary flow groove opened on the top of the auxiliary flow cone, it can leave room for the powder to be squeezed downward when the powder is pushed up and squeezed by the auxiliary flow column, avoiding the accumulation of powder on the conical valve plug surface caused by the auxiliary flow column breaking the powder accumulation upward, which helps to break the powder accumulation and discharge smoothly. Combined with the guide sleeve of the guide frame, which is sleeved in the auxiliary flow groove, it can guide the conical valve plug up and down, avoiding the directional deviation of the feeder top head at the bottom and the downward reset deviation after the lifting is released.

[0025] 2. After the powder in the moving silo is unloaded from the fixed silo, it is discharged through the silo discharge valve and sent to the metering screw device for metering and delivery. The powder is then sent to the water-soluble polymer dispersion device in a quantitative manner through the metering discharge valve. The metering screw device is adjusted according to the real-time required amount of powder to meet the timeliness requirements of on-site preparation. The solid silo adopts an inverted cone structure with a coating on the inner wall, which can effectively ensure the falling and delivery of powder and prevent it from adhering and accumulating in the fixed silo.

[0026] 3. The use of our patented water-soluble polymer dispersion device can effectively improve the dispersion and dissolution performance of powder; and another branch can be split from the first water inlet pipe through the metering discharge valve. When quantitatively conveying powder, the powder in the pipe connecting the metering screw device and the water-soluble polymer dispersion device can be completely sent into the water-soluble polymer dispersion device, avoiding the presence of some powder residue in the pipe and improving the accuracy of the ratio control of friction reducer polymer dissolution.

[0027] 4. The movable skid base with explosion-proof container structure, combined with insulation and a door structure, helps to improve insulation and explosion-proof performance, while meeting the requirements for outdoor mobile and fixed-point use in various environments, and can work in harsh and cold environments.

[0028] 5. Multiple fixed silos are connected to a single discharge pipe via corresponding valve pumps in the subsequent delivery pipelines. This allows for the use of one silo for operation and one for standby, or for combining two lines, or for each silo to be connected to a separate discharge pipe to meet the requirement of simultaneous supply from two lines. This system offers advantages such as ease of maintenance, stable operation with switchable connections, and increased supply capacity. A branch line connected to a multi-way valve can also be installed below the metering screw device, similarly enabling one-for-one standby switching. It can also be used in emergency situations such as shutdown or failure of any water-soluble polymer dispersion unit, and can further meet the requirement of combining two lines. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the mobile hopper structure of the present invention.

[0030] In the diagram: 1. Movable skid; 2. Feed rack; 3. Fixed hopper; 4. Conical discharge valve; 5. Hopper discharge valve; 6. Metering screw device; 7. Metering discharge valve; 8. Straight pipe; 9. Water-soluble polymer dispersion device; 10. Movable hopper; 11. Upper hopper body; 12. Hopper cover; 13. Hopper lens; 14. Air valve connector; 15. Lower hopper body; 16. Lower outlet; 17. Conical valve plug; 18. Valve plug sealing ring; 19. Flow aid column; 20. Flow aid groove; 21. Support column. 2. Support base 23, Through cavity 24, Shock absorber 25, First reinforcing plate 26, Round plate side leg 27, Vibrator 28, Second reinforcing plate 29, Guide frame 30, Guide sleeve 31, Main water inlet pipe 32, Water pump 33, Main valve 34, Main flow meter 35, First water inlet pipe 36, Branch valve 37, Branch flow meter 38, Second water inlet pipe 39, Hot air compression pipe 40, Application valve pump 41, Discharge pipe 42, Two-way valve 43. Detailed Implementation

[0031] The following description, in conjunction with the accompanying drawings and embodiments, provides further details.

[0032] Figure 1 As shown: A high-efficiency dual polymer dissolution device for on-site preparation of friction reducers includes a movable skid 1, a feed rack 2, a fixed silo 3, a conical discharge valve 4, a metering screw device 6, a metering discharge valve 7, a straight pipe 8, a water-soluble polymer dispersion device 9, a movable silo 10, an application valve pump 41, and a discharge pipe 42.

[0033] In this embodiment, the movable skid 1 adopts an insulated container structure with a door and insulation layer. Only the internal structure of the container is shown in this figure. The container structure belongs to the prior art.

[0034] The movable skid 1 contains two or more fixed hoppers 3. A feeding rack 2 is mounted on the movable skid 1, with its upper end higher than the fixed hoppers 3 and supporting the movable hopper 10. A feeder is mounted on the feeding rack 2. The lower conical opening of the fixed hopper 3 is connected to one end of a metering screw device 6 via a hopper discharge valve 5. The other end of the metering screw device 6 is connected to a metering discharge valve 7, which is a four-way valve. One path of the metering discharge valve 7 is connected to a water-soluble polymer dispersion device 9 via a straight pipe 8. The upper and lower sides of the water-soluble polymer dispersion device 9 are connected to the first and second water inlet pipes 36 and 39, respectively. Branch valves 37 and branch flow meters 38 are installed on both 39. The first and second inlet pipes are connected to the main inlet pipe 32. The main inlet pipe 32 is equipped with a water pump 33, a main valve 34, and a main flow meter 35 in sequence. The first inlet pipe 36 branches into two paths after the branch flow meter. One path is connected to the water-soluble polymer dispersion device via a valve, and the other path is connected to the metering discharge valve 7. The metering discharge valve 7 connected to the metering screw devices 6 corresponding to the two fixed silos 3 is connected to a bidirectional valve 43. The discharge port of the water-soluble polymer dispersion device is connected to the discharge pipe 42 via the valve pump 41. The discharge pipe 42 is connected to the sand mixer at the work site.

[0035] In this embodiment, the metering screw device 6 is a screw conveying structure with metering function, which belongs to the prior art structure.

[0036] In this embodiment, the feeder is a conical discharge valve 4, and the conical structure of the conical discharge valve corresponds to the support of the conical valve plug.

[0037] In this embodiment, the water-soluble polymer dispersion device 9 adopts the dispersion device of US20150352507A1. The discharge of the metering screw device is connected to the upper feed of the water-soluble polymer dispersion device. The first and second water inlet pipes 36 and 39 are connected to its primary water inlet and secondary water circuit, respectively.

[0038] In this embodiment, the inner wall of the fixed hopper is coated with polytetrafluoroethylene, ceramic, or polyurethane.

[0039] In this embodiment, vibrators can be installed on the outer wall of the fixed silo and the outer wall of the silo discharge valve.

[0040] Based on this embodiment, the metering discharge valve can be equipped with an external hot air compression pipeline 40 for supplying air to the drying straight pipe. Alternatively, a hot air compression pipeline can be connected to the fixed silo to prevent the powder inside the fixed silo from getting damp. The hot air compression pipeline uses electric heating, air filter, and air compressor connection technology, which is existing technology.

[0041] Figure 2As shown, the mobile hopper 10 includes upper and lower hopper bodies 11 and 16 that are connected in the upper and lower parts. A hopper cover 12 is provided at the upper inlet at the center of the upper end of the upper hopper body 11. Three or more lifting lugs 13 are evenly distributed around the upper part or upper end of the upper hopper body 11. An air valve connector 15 is connected to the upper end of the upper hopper body 11, and the air valve connector is connected to a drying filter. The lower chamber 16 has an inverted conical structure. The bottom of the inverted conical lower chamber 16 is provided with a lower outlet 17. The outward tilt angle of the lower outlet is greater than the outward tilt angle of the side of the inverted conical lower chamber, that is, the included angle of the generatrix of the inverted conical lower chamber is greater than the included angle of the generatrix of the lower outlet. A conical valve plug 18 is built inside the lower chamber 16. A valve plug sealing ring 19 is provided at the lower end of the conical valve plug 18 and is pressed against the inner wall of the lower outlet 17 by its own weight. The top of the conical valve plug 18 is vertically connected to a flow aiding column 20. The top of the flow aiding column 20 is a conical structure. The flow aiding column 20 under the conical structure has one or more flow aiding grooves 21 around its outer periphery.

[0042] The lower compartment 16 has four vertically connected support columns 22 evenly distributed around its circumference on its inverted conical outer wall. Two support seats 23 are respectively connected to the lower ends of two parallel support columns 22. The support seats 23 have through-cavities 24 for forklift arms to pass through. Shock absorbers 25 are installed at the bottom of the support seats 23 corresponding to the two support columns above them. The upper surfaces of the two support seats 23 are connected to two parallel first and second reinforcing plates 26 and 29. The first and second reinforcing plates have openings in the middle and fit seamlessly onto the outer wall of the lower outlet of the conical valve plug at the corresponding valve plug sealing ring pressing position. The first reinforcing plate 26 is supported by four circular plate legs 27 on the lower support bases of the two supporting columns on its outer perimeter. The second reinforcing plate 29 is supported by the four circular plate legs 27 on the first reinforcing plate 26 on its corresponding positions. Both the first and second reinforcing plates are equipped with vibrators 28. One or more vibrators can be installed on the same reinforcing plate. Multiple vibrators can be arranged in two or more circularly symmetrically or evenly on their respective reinforcing plates. The position of the second reinforcing plate can correspond to the inverted conical side of the lower chamber 16 on the lower outlet 17. A guide frame 30 is horizontally provided inside the lower chamber 16. The guide sleeve 31 at the center of the guide frame 30 is fitted into the flow aid groove 21. Vibrators are added to the outer walls of the upper chamber and / or the lower chamber.

[0043] The upper and lower hopper bodies of this mobile hopper can be made of fiberglass, which is beneficial for environmental resistance and lightweight use. A hopper lens 14 can also be installed on the upper hopper body for visual monitoring. The hopper lens 14 can be set as a multi-segment structure to avoid the impact of a continuous structure on the strength of the hopper body.

Claims

1. A highly efficient dual-polymer dissolving device for on-site preparation of friction reducers, comprising a movable skid base, wherein two or more fixed hoppers are disposed within the movable skid base, characterized in that: The movable skid is equipped with a feeding rack, the upper end of which is higher than the fixed silo. The feeding rack is equipped with a feeding hole corresponding to the lower opening of the movable silo. The movable silo is connected to the feeder at the upper end of the fixed silo. The lower conical opening of the fixed silo is connected to a metering screw device. The discharge of the metering screw device is connected to a water-soluble polymer dispersion device. The upper and lower sides of the water-soluble polymer dispersion device are respectively connected to the first and second water inlet pipes. Branch valves and branch flow meters are installed on the first and / or second water inlet pipes. The first and second water inlet pipes are connected to the main water inlet pipe. A water pump, a main valve, and a main flow meter are installed sequentially on the main water inlet pipe. The discharge port of the water-soluble polymer dispersion device is connected to a sand mixer via a discharge pump. The mobile hopper includes upper and lower hoppers connected vertically. The upper hopper has a cover at its central upper inlet. Three or more lifting lugs are evenly distributed around the circumference of the upper hopper. An air valve connector is connected to the upper end of the upper hopper, which is connected to a drying filter. The lower hopper has an inverted conical structure with a lower outlet at its bottom. The outward tilt angle of the lower outlet is greater than the outward tilt angle of the side of the inverted cone of the lower hopper. The generatrix angle of the inverted cone of the lower hopper is greater than the generatrix angle of the cone of the lower outlet. A conical valve plug corresponding to the feeder is built into the lower hopper. A valve plug sealing ring is provided at the lower end of the conical valve plug, pressing against the inner wall of the lower outlet by its own weight. A flow-aiding top column is vertically connected to the apex of the conical valve plug. The top of the flow-aiding top column has a conical structure, and one or more flow-aiding grooves are formed around its outer circumference. The outer wall of the inverted cone of the lower hopper is evenly distributed around its circumference. Four vertical support columns are connected to the bottom. Two support seats are respectively connected to the lower ends of two parallel support columns. The support seats have through-cavities for forklift arms to pass through. Shock absorbers are installed at the bottom of the support seats corresponding to the two support columns. Two parallel first and second reinforcing plates are connected to the upper end faces of the two support seats. The first and second reinforcing plates have openings in the middle and fit seamlessly onto the outer wall of the lower outlet of the conical valve plug at the corresponding valve plug sealing ring pressing position. The outer periphery of the first reinforcing plate is supported on the support seats at the lower ends of the two support columns by multiple circular plate legs around the circumference of the two support columns. The second reinforcing plate is supported on the first reinforcing plate by the circular plate legs of the first reinforcing plate at the position of the multiple circular plate legs around the circumference of the first reinforcing plate. Vibrators are provided on both the first and second reinforcing plates. One or more vibrators are provided on the same reinforcing plate. Multiple vibrators are arranged in two or more circularly symmetrically or evenly on their respective reinforcing plates.

2. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The metering screw device discharges from the upper feed of the water-soluble polymer dispersion device, and the first and second water inlet pipes are connected to its primary water inlet and secondary water circuit, respectively.

3. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The movable skid is an explosion-proof container structure, which is an insulated box structure with a door, and the feeding rack is mounted on the top of the container structure.

4. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The discharge pumps connected to the two or more fixed silos are connected to a common discharge pipe, or each is connected to a separate discharge pipe.

5. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1 or 4, characterized in that: The discharge pump is a valve-operated pump.

6. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The feeder is a conical discharge valve, and the conical structure of the conical discharge valve corresponds to the support of the conical valve plug.

7. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The inner wall of the fixed silo is coated with polytetrafluoroethylene, ceramic, or polyurethane.

8. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The metering screw devices connected to the two or more fixed silos each have their discharge routes split into two paths: one path connects to the water-soluble polymer dispersion device corresponding to each fixed silo, and the other path connects to two or more multi-port valves.

9. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The lower discharge port of the fixed silo is connected to a metering screw device via a silo discharge valve.

10. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 9, characterized in that: The outer wall of the fixed silo and / or the outer wall of the silo discharge valve are equipped with vibrators.

11. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1 or 2, characterized in that: The metering screw device discharges material via a metering discharge valve and a hose connected to the upper end of the water-soluble polymer dispersion device; or the metering screw device discharges material via a metering discharge valve and a straight pipe connected to the upper end of the water-soluble polymer dispersion device.

12. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 11, characterized in that: The metering discharge valve is a three-way or higher valve. The first water inlet pipeline is branched into two paths after the flow meter. One path is connected to the water-soluble polymer dispersion device via a valve, and the other path is connected to the metering discharge valve via a valve.

13. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 12, characterized in that: The metering discharge valve is also connected to an electrically heated hot air compression pipeline.

14. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 1, characterized in that: The side wall of the fixed silo is connected to an electrically heated hot air compression pipeline.

15. The high-efficiency dual polymer dissolution device for on-site preparation of friction reducers according to claim 13 or 14, characterized in that: The air compression pipeline is sequentially arranged with an electric heater, an air filter, and an air compressor facing outwards.

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