Viscosity reducer blending device for oil well
By designing arc-shaped scrapers and shear blades, combined with airflow-assisted powder conveying, the problems of powder solidification and adhesion were solved, achieving efficient dispersant formulation and equipment cleaning, and improving mixing efficiency and equipment stability.
Patent Information
- Application Number
- CN202522657493.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-12-16
AI Technical Summary
Existing viscosity reducer mixing equipment tends to cause powder to solidify and form insoluble colloids when mixing solid and liquid materials, requiring prolonged stirring. Furthermore, the finished viscosity reducer tends to adhere to the inner wall of the equipment, making cleaning difficult, affecting accuracy and equipment stability, and increasing maintenance costs.
The design incorporates an arc-shaped scraper and shear blades, combined with airflow-assisted powder conveying. The shear blades break up clumps, and the scraper removes adhering substances, ensuring uniform mixing and equipment cleanliness.
It shortens the mixing cycle, avoids material waste and cleaning difficulties, improves mixing efficiency and equipment operation stability, and reduces maintenance costs.
Smart Images
Figure CN223969846U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of viscosity reducer preparation equipment, specifically a viscosity reducer preparation device for oil wells. Background Technology
[0002] Oil well viscosity reducers are key chemical additives in the entire process of oil well development and crude oil gathering and transportation. They are widely used in various core operational stages. Their main applications include solving lifting difficulties caused by excessively high crude oil viscosity during the wellbore development stage of high-viscosity heavy oil wells, high-wax oil wells, and high-water-cut oil wells; effectively preventing increased pipeline resistance or even blockage caused by poor crude oil flowability in oilfield gathering and transportation stations and combined stations; and rapidly restoring crude oil flowability and ensuring continuous production operation in emergency operations such as restarting oil wells after shutdown and maintenance, handling pipeline blockages, and handling low-temperature weather.
[0003] The core function of this formulation is to significantly reduce crude oil viscosity by disrupting the aggregated structure of wax crystals and asphaltenes in crude oil, reducing the interfacial tension between oil and water, or diluting the crude oil system. This improves the fluidity of crude oil in wellbores and gathering pipelines. With a scientific and reasonable application strategy, oil well viscosity reducers can also reduce pipeline corrosion, reduce energy consumption during extraction and gathering, and effectively prevent production accidents such as well shutdowns and pipeline blockages caused by excessively high crude oil viscosity. Ultimately, it plays an irreplaceable and important role in improving oil well extraction efficiency, ensuring the safe and stable operation of the gathering and transportation system, and reducing overall operating costs.
[0004] However, existing technologies have the following problems in practical use;
[0005] Existing equipment requires mixing solid and liquid materials when preparing viscosity reducers. However, after the solid material is fed into the mixing equipment, the powder quickly wets and solidifies upon contact with water, forming insoluble clumps with an outer layer encapsulating an inner layer of dry powder. When using existing equipment with paddle agitation, it often requires prolonged stirring to break up the clumps, significantly extending the overall mixing cycle. Furthermore, the prepared viscosity reducer tends to adhere to the inner wall of the equipment and the surface of the mixing components, forming stubborn sticky deposits. Cleaning these requires significant manpower and time and is difficult to completely remove. Long-term accumulation can also affect the accuracy of subsequent mixing ratios and the stability of equipment operation, increasing equipment maintenance costs and downtime. Utility Model Content
[0006] (a) Technical problems to be solved
[0007] To overcome the aforementioned deficiencies of the prior art, this utility model provides a viscosity reducer preparation device for oil wells. This solves the problem mentioned in the background art: existing equipment requires mixing solid and liquid materials when preparing viscosity reducers. However, after the solid material is fed into the preparation equipment, the powder quickly wets and solidifies upon contact with water, forming insoluble clumps with an outer layer encapsulating an inner layer of dry powder. Using existing equipment with paddle agitation, prolonged stirring is often required to break up the clumps, significantly extending the overall preparation cycle. Furthermore, the prepared viscosity reducer easily adheres to the inner wall of the equipment and the surface of the agitator components, forming stubborn adhesive residues. Cleaning these residues requires significant manpower and time and is difficult to completely remove. Long-term accumulation also affects the accuracy of subsequent preparation ratios and the stability of equipment operation, increasing equipment maintenance costs and downtime.
[0008] (II) Technical Solution
[0009] To achieve the above objectives, this utility model is implemented through the following technical solution: a viscosity reducer preparation device for oil wells, comprising a mixing tank and a tank cover detachably connected to the upper end of the mixing tank, wherein a connecting frame is arranged vertically inside the mixing tank, and arc-shaped scrapers are detachably connected to both the left and right sides of the connecting frame, and the curvature of the arc-shaped scrapers matches the radius of curvature of the inner wall of the mixing tank, a rotating shaft is rotatably connected to the inner wall of the connecting frame, and a plurality of shear blades are arranged sequentially from top to bottom on the outer surface of the rotating shaft, and a double-pass pipe is arranged on the outer surface of the tank cover;
[0010] The dual-pipe system includes a vertically arranged main pipe section. One end of the main pipe section passes through one side of the tank cover and extends into the interior of the mixing tank. A connector and a dust feed pipe are arranged side by side at the upper end of the main pipe section. One end of the connector extends to the middle of the main pipe section, and the inner diameter of the extended section of the connector is smaller than the inner diameter of its exposed section. An air intake fan is provided at the upper end of the connector, and a filter screen is bolted to the upper end of the air intake fan.
[0011] Preferably, a drive motor is provided on the outer surface of the can lid near the side of the double-pass pipe, the output end of the drive motor passes through one side of the can lid and is inserted into the top of the rotating shaft, a liquid inlet pipe is provided on the side of the can lid near the drive motor, and an air outlet is provided on the outer surface of the can lid near the drive motor.
[0012] Preferably, a protective barrel is fitted onto the outer surface of the mixing tank, the lower end of the protective barrel is fixedly connected to the outer wall of the lower end of the mixing tank, the inner wall of the protective barrel and the outer surface of the mixing tank enclose a cavity, an annular heating tube is provided on the inner wall of the cavity, and an annular cover for sealing is detachably connected to the upper end of the cavity.
[0013] Preferably, a support frame is fixedly connected to the lower end of the mixing tank, and a liquid outlet pipe is detachably connected to the middle of the lower end of the mixing tank.
[0014] Preferably, the outer surface of the dust feed pipe is provided with a valve, and the outer surface of the valve is provided with friction texture for anti-slip purposes.
[0015] Preferably, the height of the arc-shaped scraper is adapted to the height of the inner wall of the mixing tank, and a gap of 5-8 cm is provided between the inner side of the arc-shaped scraper and the outer side of the shear blade.
[0016] Preferably, the main pipeline section and the dust feed pipe are integrally formed, and the joint, the dust feed pipe and the main pipeline section are connected.
[0017] Preferably, the plurality of shear blades are distributed at equal intervals along the axial direction of the rotation axis, and adjacent shear blades are arranged radially and staggered, and the edges of the shear blades are provided with cutting edges.
[0018] (III) Beneficial Effects
[0019] This utility model provides a viscosity reducer preparation device for oil wells, which has the following beneficial effects:
[0020] This viscosity reducer mixing device for oil wells, through the design of its connectors and air intake fan, allows for the addition of solid powder materials into the mixing tank. The air intake fan pressurizes the dust entering the main pipeline section via the dust feed pipe, propelling the powder quickly and evenly into the mixing tank. This prevents powder accumulation and blockage within the pipeline. Simultaneously, the airflow helps disperse the powder, reducing the probability of agglomerates forming due to excessively high local concentrations when the powder contacts the liquid material. This improves the efficiency of solid-liquid mixing and prevents the formation of insoluble agglomerates where the solid powder material forms an outer layer encapsulating an inner layer of dry powder. The need for prolonged stirring to break up clumps significantly extends the overall mixing cycle. However, by utilizing the combined design of an arc-shaped scraper, connecting frame, and shear blades, the arc-shaped scraper rotates close to the inner wall of the mixing tank during stirring, effectively scraping away any viscosity-reducing agent residue adhering to the tank wall in real time. This avoids material waste and subsequent cleaning difficulties caused by solid and liquid materials sticking to the wall. Meanwhile, multiple staggered shear blades further break up powder agglomerates through their own shearing action. Combined with the scraping effect of the scraper, this ensures both uniform mixing of solid and liquid materials within the tank and maintains the cleanliness of the mixing tank's inner wall. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure of the mixing tank of this utility model;
[0023] Figure 3 This is a schematic diagram of the annular heating tube structure of this utility model;
[0024] Figure 4 This is a schematic diagram of the arc-shaped scraper structure of this utility model;
[0025] Figure 5 This is a schematic diagram of the dual-pipe structure of this utility model;
[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the double-pipe of this utility model.
[0027] In the diagram: 1. Mixing tank; 2. Tank cover; 3. Connecting frame; 4. Arc-shaped scraper; 5. Rotating shaft; 6. Shearing blade; 7. Double-pass pipe; 701. Main pipe section; 702. Joint; 703. Dust feed pipe; 704. Air intake fan; 705. Filter screen; 706. Valve; 8. Drive motor; 9. Liquid feed pipe; 10. Protective tank; 11. Cavity; 12. Annular heating tube; 13. Annular cover; 14. Support frame; 15. Liquid outlet pipe. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0029] Example 1: Please refer to Figures 1 to 4 This utility model provides a technical solution: a viscosity reducer preparation device for oil wells, including a mixing tank 1 and a tank cover 2 detachably connected to the upper end of the mixing tank 1. A drive motor 8 is provided on the outer surface of the tank cover 2 near the side of the double-through pipe 7. The output end of the drive motor 8 passes through one side of the tank cover 2 and is inserted into the top of the rotating shaft 5. A liquid inlet pipe 9 is provided on the side of the tank cover 2 near the drive motor 8. An air vent is opened on the outer surface of the tank cover 2 near the drive motor 8. A connecting frame 3 is provided vertically inside the mixing tank 1. Both the left and right sides of the connecting frame 3 are detachably connected to arc-shaped... The height of the scraper 4 is adapted to the height of the inner wall of the mixing tank 1. The inner side of the scraper 4 and the outer side of the shear blade 6 are provided with a gap of 5-8cm. The curvature of the scraper 4 is matched with the radius of curvature of the inner wall of the mixing tank 1. The inner wall of the connecting frame 3 is rotatably connected to the rotating shaft 5. Multiple shear blades 6 are arranged sequentially from top to bottom on the outer surface of the rotating shaft 5. The multiple shear blades 6 are distributed at equal intervals along the axial direction of the rotating shaft 5. Adjacent shear blades 6 are arranged radially and staggered. The edge of the shear blade 6 is provided with a cutting edge. The outer surface of the tank cover 2 is provided with a double-through pipe 7.
[0030] Through the above technical solution, the drive motor 8 can generate rotational power, which drives the connecting frame 3 and the rotating shaft 5 to rotate the shear blades 6 and the arc-shaped scraper 4. The arc-shaped scraper 4 matches the inner wall of the mixing tank 1. When it rotates synchronously with the rotating shaft 5, it scrapes off the viscosity-reducing agent residue adhering to the inner wall of the mixing tank 1, avoiding material waste, ensuring equipment cleanliness, and preventing the inner wall deposits from affecting the subsequent mixing accuracy. The shear blades 6 rotate at high speed with the rotating shaft 5, shearing the solid material clumps with their cutting edges, breaking up the clumps, and promoting the uniform dispersion of solid and liquid materials. In addition, the multiple sets of staggered shear blades 6 can improve the mixing efficiency and shorten the mixing cycle. The shear blades 6 are evenly distributed along the axial direction of the rotating shaft 5, which can ensure that the mixing tank 1 is clean and hygienic. Solid and liquid materials at different heights can be uniformly sheared, avoiding the problem of undispersed powder on the upper layer and over-stirred material on the lower layer. At the same time, a gap of 5-8cm is set between the inner side of the arc-shaped scraper 4 and the outer side of the shear blade 6. This not only avoids collision and interference between the arc-shaped scraper 4 and the shear blade 6 when they rotate, ensuring the safety of equipment operation, but also leaves enough space for the solid and liquid materials to flow between them. This allows the solid and liquid materials scraped off the wall by the arc-shaped scraper 4 to be quickly sheared and dispersed by the shear blade 6, avoiding secondary adhesion to the wall. The liquid feed pipe 9 can send liquid materials into the interior of the mixing tank 1, realizing the precise addition of solid and liquid materials. The vent on the outer surface of the tank cover 2 can balance the air pressure inside the mixing tank 1, preventing excessive internal pressure from affecting the feeding.
[0031] Please see Figure 5 and Figure 6 The dual-pipe 7 includes a vertically arranged main pipe section 701. One end of the main pipe section 701 passes through one side of the tank cover 2 and extends into the interior of the mixing tank 1. A connector 702 and a dust feed pipe 703 are arranged side by side at the upper end of the main pipe section 701. One end of the connector 702 extends to the middle of the main pipe section 701, and the inner diameter of the extended section of the connector 702 is smaller than the inner diameter of its exposed section. An air intake fan 704 is provided at the upper end of the connector 702. A filter screen 705 is bolted to the upper end of the air intake fan 704. A valve 706 is provided on the outer surface of the dust feed pipe 703. Friction textures for anti-slip are opened on the outer surface of the valve 706. The main pipe section 701 and the dust feed pipe 703 are integrally formed, and the connector 702, the dust feed pipe 703 and the main pipe section 701 are connected.
[0032] Through the above technical solution, the main pipeline section 701 serves as the vertical core channel of the dual-pipe 7. One end extends into the interior of the mixing tank 1, enabling the directional conveying of solid powder materials and airflow into the tank. The other end connects to the connector 702 and the dust feed pipe 703, receiving the airflow input from the intake fan 704 and the powder fed in by the dust feed pipe 703, providing space for the two to mix. Furthermore, its vertical orientation allows for gravity-assisted powder descent, and combined with airflow pressurization, further improves conveying efficiency. The integrated design of the main pipeline section 701 and the dust feed pipe 703 eliminates... The pipe joint gaps prevent powder from accumulating and clogging at the interface. Meanwhile, it's worth noting that one end of connector 702 extends into the middle of the main pipe section 701. The inner diameter of the connector 702 extending into the main pipe section 701 is smaller than the inner diameter of its exposed section. Therefore, the pipe extending from connector 702 into the main pipe section 701 forms a reduced-diameter structure. When the intake fan 704 continuously supplies gas to connector 702, the gas velocity increases significantly as it flows through this reduced-diameter extension section due to the sudden decrease in the flow cross-sectional area. The high-speed airflow then enters the main pipe section 701. After step 1, a jet effect will be formed inside the pipe. The high-speed airflow will drive the surrounding stationary or low-speed airflow forward, causing a local gas pressure reduction at the connection between the main pipe section 701 and the dust feed pipe 703. This will create a stable micro-negative pressure zone, which will pull the powder in the dust feed pipe 703 towards the main pipe section 701. Finally, the powder will mix with the high-speed airflow. With the combined effect of airflow thrust and gravity, the powder can be transported quickly and without blockage. At the same time, the filter screen 705 can filter dust and impurities in the outside air, preventing them from entering the mixing chamber with the airflow. The contamination of the viscosity reducer material in tank 1 features a parallel structure of connector 702 and dust feed pipe 703, forming a coordinated feeding and air intake setup. This ensures that the powder can be immediately mixed with the airflow after entering the main pipeline section 701. The valve 706 on the outer surface of the dust feed pipe 703 can control the opening and closing of the dust feed pipe 703, enabling quantitative and controllable feeding of solid powder materials and accurately matching the powder addition ratio of the viscosity reducer formula. The anti-slip friction texture on the outer surface improves the grip stability of oilfield operators, preventing slippage when twisting and ensuring the accuracy of feed quantity control.
[0033] Example 2: Please refer to Figures 1 to 2 Based on Embodiment 1, this utility model provides a technical solution in which a protective barrel 10 is fitted on the outer surface of the mixing tank 1. The lower end of the protective barrel 10 is fixedly connected to the outer wall of the lower end of the mixing tank 1. The inner wall of the protective barrel 10 and the outer surface of the mixing tank 1 enclose a cavity 11. An annular heating tube 12 is provided on the inner wall of the cavity 11. An annular cover 13 for sealing is detachably connected to the upper end of the cavity 11. A support frame 14 is fixedly connected to the lower end of the mixing tank 1. A liquid outlet pipe 15 is detachably connected to the middle part of the lower end of the mixing tank 1.
[0034] Through the above technical solution, in actual use, the protective barrel 10 and the mixing tank 1 enclose a cavity 11, providing installation space for the annular heating tube 12 and protecting it. The cavity 11 also forms an annular heating space, confining the heat generated by the annular heating tube 12 between the outer wall of the mixing tank 1 and the inner wall of the protective barrel 10, reducing heat loss to the external environment and improving heating efficiency. Simultaneously, the annular heating tube 12 ensures uniform heat distribution along the outer periphery of the mixing tank 1, preventing localized overheating that could degrade the viscosity reducer components, ensuring uniform heating of the material inside the tank, and aiding in the dissolution of solid powder materials. Furthermore, the heat generated by the annular heating tube 12 after being energized also enhances the dissolution of solid powder materials. The dissolution rate of the bulk material is reduced, the viscosity of the material is reduced, and the formation of clumps is reduced. The annular layout matches the cylindrical structure of the mixing tank 1, further ensuring the uniformity of heating and avoiding the problem of insufficient dissolution of local materials due to excessively low temperature. The annular cover 13 seals the upper end of the cavity 11, completely sealing the heating space and minimizing heat loss from the top of the cavity 11, thus ensuring heating efficiency. At the same time, the support frame 14 provides stable support for the entire mixing tank 1 and the protective tank 10, allowing the mixing tank 1 to be lifted off the ground and avoiding corrosion and wear caused by direct contact between the bottom of the mixing tank 1 and the ground. The liquid outlet pipe 15 is located at the lower middle part of the mixing tank 1, using gravity to allow the finished product in the tank to be completely and smoothly discharged, avoiding residue.
[0035] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power via standard interfaces. The main controller can be any commercially available known device. There are no special restrictions on the specific models of the electrical components; any commercially available ordinary products can be selected, as long as they meet the usage requirements of this utility model.
[0036] In this invention, the working steps of the device are as follows:
[0037] First, connect the liquid feed pipe 9 to an external pipeline. Then, open the liquid feed pipe 9 and inject the liquid material required for the viscosity reducer into the mixing tank 1 through the liquid feed pipe 9. After filling to the preset liquid level, close the liquid feed pipe 9 and start the annular heating pipe 12 to heat the liquid material in the mixing tank 1. Next, connect the dust feed pipe 703 to an external pipeline and open the valve 706. At the same time, start the air intake fan 704 to input airflow into the main pipe section 701 of the dual-pass pipe 7. Then, the solid powder material is slowly added through the dust feed pipe 703. The airflow creates a pressurized pushing effect on the powder in the main pipe section 701, entraining... The powder enters the mixing tank 1 along the main pipeline section 701, achieving preliminary mixing of the powder and liquid materials. During the process, the gas inside the mixing tank 1 is discharged in real time through the vent to balance the gas pressure inside the mixing tank 1 and prevent abnormal pressure from affecting the feeding. After the powder is added, the valve 706 is closed, and the air intake fan 704 is kept running for a period of time. After the residual powder in the dust feed pipe 703 is emptied, the air intake fan 704 is closed. Then, the drive motor 8 is started to drive the rotating shaft 5 to rotate, which drives the shear blades 6 and the connecting frame 3 to rotate synchronously. The high-speed rotation of the shear blades 6 stirs the materials in the tank and shears the agglomerates formed by the solid powder through the blade edge. The connecting frame 3 drives the arc scraper Plate 4 rotates close to the inner wall of mixing tank 1, scraping away residual solid and liquid materials adhering to the tank wall in real time. The scraped solid and liquid materials flow with the fluid inside the tank. After mixing is completed, drive motor 8 is turned off, and tank cover 2 is opened to observe the material being mixed inside the tank. Once there are no obvious lumps and the material is uniform, the liquid outlet pipe 15 is opened, and gravity is used to smoothly discharge the prepared viscosity reducer along the liquid outlet pipe 15 and collect it into a designated container. After discharging, the annular heating pipe 12 is turned off. When it is necessary to clean mixing tank 1, sufficient cleaning solution is injected into mixing tank 1 through liquid inlet pipe 9 on tank cover 2. Then, drive motor 8 and annular heating pipe 12 are started simultaneously. Heating tube 12 transfers heat to mixing tank 1 through cavity 11, accelerating the melting and dissolution of residual viscosity reducer material. At the same time, drive motor 8 drives rotating shaft 5 to rotate. On one hand, shear blade 6 rotates at high speed, and the water flow agitates to form a scouring force, impacting and peeling off the residual material in the tank. On the other hand, connecting frame 3 drives arc scraper 4 to rotate close to the tank wall, scraping off the solidified residue adhering to the inner wall of the tank. The scraped-off residual viscosity reducer material is fully dissolved and mixed with the cleaning liquid. After cleaning is completed, drive motor 8 and annular heating tube 12 are turned off, and discharge valve of outlet pipe 15 is opened to allow the cleaning wastewater containing residual viscosity reducer material to be completely discharged along outlet pipe 15.
[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A viscosity reducer preparation device for oil well, comprising a stirring tank (1) and a tank cover (2) detachably connected to the upper end of the stirring tank (1), characterized in that: The inside of the stirring tank (1) is provided with a connecting frame (3) in the vertical direction, the left and right sides of the connecting frame (3) are detachably connected with arc-shaped scrapers (4), the curvature of the arc-shaped scrapers (4) matches the radius of curvature of the inner wall of the stirring tank (1), the inner wall of the connecting frame (3) is rotationally connected with a rotating shaft (5), the outer surface of the rotating shaft (5) is sequentially provided from top to bottom with a plurality of shearing paddles (6), and the outer surface of the tank cover (2) is provided with a double-pipe (7). The double-pipe (7) comprises a vertically arranged main pipe section (701), one end of the main pipe section (701) penetrates through one side of the tank cover (2) and extends into the inside of the stirring tank (1), the upper end of the main pipe section (701) is provided with a joint (702) and a dust feeding pipe (703) in parallel, one end of the joint (702) extends to the middle part of the main pipe section (701), the inner diameter of the extension section of the joint (702) is smaller than the inner diameter of the exposed section, the upper end of the joint (702) is provided with an air inlet fan (704), and the upper end of the air inlet fan (704) is connected with a filter screen (705) through bolts.
2. A visbreaker formulation apparatus for oil wells as claimed in claim 1 wherein: The side of the outer surface of the tank cover (2) close to the double-pipe (7) is provided with a driving motor (8), the output end of the driving motor (8) penetrates through one side of the tank cover (2) and is inserted into the top end of the rotating shaft (5), the side of the tank cover (2) close to the driving motor (8) is provided with a liquid feeding pipe (9), and the side of the outer surface of the tank cover (2) close to the driving motor (8) is provided with an air outlet hole.
3. A visbreaker formulation apparatus for oil wells as claimed in claim 1 wherein: The outer surface of the stirring tank (1) is sleeved with a protective barrel (10), the lower end of the protective barrel (10) is fixedly connected with the outer wall of the lower end of the stirring tank (1), the inner wall of the protective barrel (10) and the outer surface of the stirring tank (1) form a cavity (11), the inner wall of the cavity (11) is provided with an annular heating pipe (12), and the upper end of the cavity (11) is detachably connected with an annular cover (13) for sealing.
4. A visbreaker formulation apparatus for oil wells as claimed in claim 1, wherein: The lower end of the stirring tank (1) is fixedly connected with a support frame (14), and the middle part of the lower end of the stirring tank (1) is detachably connected with a liquid outlet pipe (15).
5. A visbreaker formulation apparatus for oil wells as claimed in claim 1, wherein: The outer surface of the dust feeding pipe (703) is provided with a valve (706), and the outer surface of the valve (706) is provided with friction lines for anti-skid.
6. A viscosity breaker dispensing device for oil wells as claimed in claim 1, wherein: The height of the arc-shaped scraper (4) is adapted to the height of the inner wall of the stirring tank (1), and the inner side of the arc-shaped scraper (4) and the outer side of the shearing paddle (6) are provided with a gap of 5-8 cm.
7. A viscosity breaker dispensing device for oil wells as claimed in claim 1, wherein: The main pipe section (701) and the dust feeding pipe (703) are integrally formed, and the joint (702), the dust feeding pipe (703) and the main pipe section (701) are communicated.
8. A viscosity reducer blending apparatus for oil wells as defined in claim 1, wherein: A plurality of shearing paddles (6) are distributed at equal intervals along the axial direction of the rotating shaft (5), and adjacent two shearing paddles (6) are radially and staggeredly arranged, and the edge of the shearing paddle (6) is provided with a cutting edge.