An on-line mixing device for preparing a fracturing fluid using a polymer dry powder

Abstract

This invention belongs to the field of shale oil extraction technology, specifically an online mixing device for preparing fracturing fluid using polymer dry powder. Addressing the potential for agglomeration of the dry powder during thickening and mixing, which hinders effective dispersion in water and leads to insufficient fluid concentration and reduced proppant carrying capacity, the invention proposes the following solution: a mixing platform equipped with a water tank, and the water tank having a water delivery pipe and an inlet pipe. This online mixing device for preparing fracturing fluid using polymer dry powder improves the quality of fracturing fluid mixing. During mixing, the device actively intervenes to prevent polymer dry powder agglomeration, ensuring the powder is dispersed upon entering the venturi tube. Simultaneously, the negative pressure generated by the high-speed water flow through the throat of the venturi tube rapidly draws in the powder, enhancing the mixing effect.

Description

Technical Field

[0001] This invention relates to the field of shale oil extraction technology, and in particular to an online mixing device for preparing fracturing fluid using polymer dry powder. Background Technology

[0002] Fracturing fluid is the core working fluid used in hydraulic fracturing operations during oil and gas extraction. Simply put, it is pumped into underground rock formations under high pressure, acting like a "hydraulic jack" to open or expand the reservoir rock into fractures. At the same time, it carries proppant into the fractures and keeps the fractures open after the pressure is released, thereby forming a high-conductivity channel for oil and gas to flow into the wellbore, achieving the purpose of increasing production and injection.

[0003] Hydraulic fracturing is one of the most commonly used methods for shale oil extraction. This technology utilizes the principles of high-pressure water injection, rock fracturing, and oil and gas release. Fracturing fluid (water and chemical additives) is injected into the rock fractures to create high pressure, causing the rock to fracture and extend further along the rock strata, thereby releasing shale oil from the rock pores for extraction operations.

[0004] Existing fracturing fluids require the addition of polymer powder to water during mixing to thicken them. However, the powder may clump during thickening and mixing, making it difficult for the polymer powder to disperse effectively in water. This results in insufficient effective fluid concentration and reduces the proppant carrying capacity of the fracturing fluid, thus affecting the mixing quality of the fracturing fluid. Summary of the Invention

[0005] This invention discloses an online mixing device for preparing fracturing fluid using polymer dry powder, aiming to solve the technical problem in the prior art where the dry powder may clump during thickening and mixing, resulting in the polymer dry powder being difficult to disperse effectively in water during the mixing process, leading to insufficient effective fluid concentration and reduced proppant carrying capacity of the subsequent fracturing fluid.

[0006] This invention proposes an online mixing device for preparing fracturing fluid using polymer dry powder, comprising: A mixing platform is provided, and a water tank is provided on the mixing platform. The water tank is provided with a water delivery pipe and a water inlet pipe. A mixing tank is set on a mixing platform, and a reagent tank and a sand box are also set on the mixing platform. One end of the water inlet pipe is set on the mixing tank, and a fluid passage pipe is also set on the mixing tank. Chemical reagent tubes are installed on the reagent tank and the mixing tank, and the same sand material tube is also installed on the sand box and the mixing tank; The discharge pump pipe is installed on the mixing tank; A powder mixing unit is installed on the water conveying pipe and the fluid passage pipe. The powder mixing unit includes a powder pressing chamber and a Venturi tube, with the Venturi tube located between the water conveying pipe and the fluid passage pipe. A quantitative discharge module is installed on the discharge pump pipe, and the quantitative discharge module includes an adjusting gear and an adjusting base plate.

[0007] In a preferred embodiment, the powder mixing unit further includes: A connecting mixing chamber is provided on a venturi tube, and the venturi tube has multiple connecting holes, each of which is equipped with a powder passage pipe. The inner ring is installed on the venturi tube, and the inner ring and the mixing chamber are connected by the same annular disk. A fixed gear ring is mounted on an annular disk, which is located outside the mixing chamber.

[0008] In a preferred embodiment, the powder mixing unit further includes: Multiple mounting rods are mounted on an annular disc and are located inside the connecting mixing chamber. Multiple internal flaps are installed on multiple mounting rods, and the outer walls of the multiple internal flaps are in contact with the inner wall of the connecting mixing chamber.

[0009] In a preferred embodiment, the powder mixing unit further includes: An active motor is mounted on the connecting mixing chamber. The output shaft of the active motor is connected to an active gear via a coupling. The active gear meshes with a fixed gear ring. A dry powder pipe is installed on the connecting mixing chamber. A connecting rod support is installed on the dry powder pipe, and two shaft members are installed on the connecting rod support.

[0010] In a preferred embodiment, the powder mixing unit further includes: Two connecting plate frames are respectively set on two shaft members. The powder pressing chamber is set on the two connecting plate frames. The powder pressing chamber and the dry powder pipe are provided with the same elastic telescopic pipe. The powder inlet is located on the powder pressing chamber.

[0011] In a preferred embodiment, the powder mixing unit further includes: The fastener is installed on the venturi tube; The mounting component is installed on the powder pressing chamber, and the mounting component and the fixing component are equipped with the same electric telescopic rod.

[0012] In a preferred embodiment, the powder mixing unit further includes: A servo motor is installed on the powder pressing chamber. The output shaft of the servo motor is connected to a rotating disk via a coupling. The rotating disk is located inside the powder pressing chamber. Multiple mounting shafts are provided, all of which are mounted on a rotating disk, and each of the mounting shafts is equipped with an inner pressure powder roller. The center roller is located inside the powder pressing chamber, and the outer walls of multiple inner pressure rollers are in contact with the outer wall of the center roller.

[0013] In a preferred embodiment, the quantitative drainage module further includes: A drain chamber is provided on the discharge pump pipe, and the adjusting base plate is provided inside the drain chamber; A sealing gasket is provided on the adjusting base plate, and the outer wall of the sealing gasket is in contact with the interior of the drain chamber.

[0014] In a preferred embodiment, the quantitative drainage module further includes: Multiple telescopic spring rods are provided on the mixing platform, and one end of each of the multiple telescopic spring rods is provided on the adjusting base plate. The adjusting base plate is also provided with a drain hose, and a drain pump is provided on the drain hose. An adjusting frame seat is installed on the drain chamber, and the drain chamber has an installation cavity inside.

[0015] In a preferred embodiment, the quantitative drainage module further includes: A general-purpose motor is mounted on an adjusting frame, and the output shaft of the general-purpose motor is connected to an adjusting gear via a coupling. The adjusting gear is located inside the mounting cavity. A guide rod frame is mounted on an adjusting frame seat. The interior of the guide rod frame is connected to the interior of the mounting cavity. The adjusting rack is mounted inside the guide rod frame and meshes with an adjusting gear.

[0016] As can be seen from the above, the online mixing device for preparing fracturing fluid using polymer dry powder provided by the present invention has the effect of improving the mixing quality of fracturing fluid. During mixing, the device can actively intervene to prevent the polymer dry powder from agglomerating, so that the polymer dry powder is in a dispersed state when it enters the Venturi tube. At the same time, the negative pressure generated when the water flows through the throat at high speed in the Venturi tube can quickly and evenly draw in the powder in the mixing chamber, thereby improving the mixing effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 2This is a schematic side view of the overall structure of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 3 This is a schematic diagram of the powder mixing unit structure of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 4 This is a schematic diagram of the venturi tube and the connecting mixing chamber of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 5 This is a schematic diagram of the fixed gear ring and driving gear combination structure of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 6 This is a cross-sectional view of the interconnected mixing chamber of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 7 This is a schematic cross-sectional view of the powder mixing chamber of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 8 This is a schematic diagram of the quantitative drainage module structure of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention. Figure 9 This is a schematic diagram of the sealing gasket ring and telescopic spring rod combination structure of an online mixing device for preparing fracturing fluid using polymer dry powder proposed in this invention; Figure 10 This is a schematic diagram of the adjusting rack and adjusting gear combination structure of an online mixing device for preparing fracturing fluid using polymer dry powder, as proposed in this invention.

[0018] In the diagram: 1. Mixing platform; 2. Water conveying pipe; 3. Sand box; 4. Mixing tank; 5. Water tank; 6. Powder mixing unit; 601. Venturi tube; 602. Powder inlet; 603. Powder pressing chamber; 604. Connecting mixing chamber; 605. Mounting component; 606. Electric telescopic rod; 607. Fixing component; 608. Mounting inner ring; 609. Powder passage pipe; 610. Annular disc; 611. Fixed gear ring; 612. Drive gear; 613. Connecting rod bracket; 614. Shaft component; 615. Servo motor; 616. Drive motor; 617. Mounting rod; 618. Inner equalization flap; 619. Dry powder pipe; 62 0. Elastic telescopic tube; 621. Connecting plate frame; 622. Inner pressure powder roller; 623. Mounting shaft; 624. Rotating disk; 625. Center roller; 7. Sand pipe; 8. Water inlet pipe; 9. Fluid passage pipe; 10. Chemical agent pipe; 11. Agent tank; 12. Quantitative drainage module; 1201. Drainage chamber; 1202. Adjusting base plate; 1203. Telescopic spring rod; 1204. Drainage hose; 1205. Drainage pump; 1206. Sealing gasket ring; 1207. General motor; 1208. Adjusting gear; 1209. Adjusting rack; 1210. Guide rod frame; 1211. Adjusting frame seat; 13. Discharge pump pipe. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The online mixing device for preparing fracturing fluid using polymer dry powder disclosed in this invention is mainly used in scenarios where the dry powder may clump during thickening and mixing, making it difficult for the polymer dry powder to be effectively dispersed in water during the mixing process, resulting in insufficient effective fluid concentration and reduced proppant carrying capacity of the subsequent fracturing fluid.

[0021] Reference Figures 1-10 An online mixing device for preparing fracturing fluid using polymer dry powder, comprising: A mixing platform 1 is provided, and a water tank 5 is provided on the mixing platform 1. A water delivery pipe 2 and a water inlet pipe 8 are provided on the water tank 5. Mixing tank 4 is set on mixing platform 1. Mixing platform 1 is also set with reagent tank 11 and sand box 3. One end of water inlet pipe 8 is set on mixing tank 4. Mixing tank 4 is also set with fluid pipe 9. Chemical reagent tube 10 is installed on reagent tank 11 and mixing tank 4. The same sand material tube 7 is also installed on sand box 3 and mixing tank 4. Discharge pump pipe 13 is installed on mixing tank 4; The powder mixing unit 6 is disposed on the water conveying pipe 2 and the fluid passage pipe 9. The powder mixing unit 6 includes a powder pressing chamber 603 and a venturi tube 601. The venturi tube 601 is located between the water conveying pipe 2 and the fluid passage pipe 9. The quantitative drainage module 12 is installed on the discharge pump pipe 13. The quantitative drainage module 12 includes an adjusting gear 1209 and an adjusting base plate 1202.

[0022] Reference Figure 1 and Figures 3-7 In a preferred embodiment, the powder mixing unit 6 further includes: A connecting mixing chamber 604 is provided on a venturi tube 601. The venturi tube 601 has multiple connecting holes, and each of the multiple connecting holes is provided with a powder passage pipe 609. The inner ring 608 is installed on the venturi tube 601, and the inner ring 608 and the mixing chamber 604 are connected by the same annular disk 610. A fixed toothed ring 611 is disposed on an annular disk 610, which is located outside the communicating mixing chamber 604.

[0023] In this invention, the powder mixing unit 6 further includes: Multiple mounting rods 617 are provided on the annular disk 610 and are located inside the connecting mixing chamber 604. Multiple inner flaps 618 are respectively installed on multiple mounting rods 617, and the outer walls of the multiple inner flaps 618 are in contact with the inner wall of the connecting mixing chamber 604.

[0024] In this invention, the powder mixing unit 6 further includes: An active motor 616 is mounted on the mixing chamber 604. The output shaft of the active motor 616 is connected to an active gear 612 via a coupling. The active gear 612 meshes with a fixed gear ring 611. Dry powder pipe 619 is installed on the connecting mixing chamber 604. A connecting rod bracket 613 is installed on the dry powder pipe 619, and two shaft members 614 are installed on the connecting rod bracket 613.

[0025] In this invention, the powder mixing unit 6 further includes: Two connecting plate frames 621 are respectively set on two shaft members 614. The powder pressing chamber 603 is set on the two connecting plate frames 621. The powder pressing chamber 603 and the dry powder pipe 619 are provided with the same elastic telescopic pipe 620. Powder inlet 602 is located on the powder pressing chamber 603.

[0026] In this invention, the powder mixing unit 6 further includes: Fastener 607 is provided on Venturi tube 601; Mounting component 605 is installed on the powder pressing chamber 603. The mounting component 605 and the fixing component 607 are equipped with the same electric telescopic rod 606.

[0027] In this invention, the powder mixing unit 6 further includes: A servo motor 615 is mounted on the powder pressing chamber 603. The output shaft of the servo motor 615 is connected to a rotating disk 624 via a coupling. The rotating disk 624 is located inside the powder pressing chamber 603. Multiple mounting shafts 623 are mounted on a rotating disk 624, and each mounting shaft 623 is equipped with an inner pressure powder roller 622. The center roller 625 is located inside the powder pressing chamber 603, and the outer walls of the multiple inner pressing rollers 622 are in contact with the outer wall of the center roller 625.

[0028] Specifically, when the powder is thickened with water, the powder is transported to the powder pressing chamber 603 through the powder inlet 602. At this time, the servo motor 615 runs, which drives the rotating disk 624 to rotate, and further drives the mounting shaft 623 and the inner pressing roller 622 to rotate. The inner pressing roller 622, together with the center roller 625, can crush the lumps in the powder. After crushing, the electric telescopic rod 606 runs, which drives the powder pressing chamber 603 and the connecting plate frame 621 to rotate, so that the powder pressing chamber 603 can be angled, so that the powder can enter the connected mixing chamber 604 through the elastic telescopic tube 620 and the dry powder tube 619. After entering the connecting mixing chamber 604, the active motor 616 drives the active gear 612 to rotate. Since the active gear 612 meshes with the fixed gear ring 611, the active motor 616 can drive the fixed gear ring 611 and the annular disk 610 to rotate, which in turn drives the mounting rod 617 and the inner equalizing flap 618 to rotate, so as to agitate the powder entering the connecting mixing chamber 604, making its distribution more even and avoiding bottom accumulation. Then, when the water flows through the venturi tube 601, the negative pressure generated at its throat can quickly draw the powder in the connecting mixing chamber 604 into it for mixing, thereby completing the thickening and mixing. In specific application scenarios, the powder mixing unit 6 is suitable for the thickening process of mixing polymer dry powder with water. That is, during the mixing process, the device can actively intervene and break up the agglomerates of polymer dry powder through the inner pressure powder roller 622 and the central roller 625, so that the polymer dry powder is in a dispersed state when it enters the Venturi tube 601. At this time, the broken dry powder has a uniform particle size and no large pieces, which provides a favorable condition for the "instantaneous wetting" of the Venturi tube 601. It also fundamentally eliminates the source of "fish eye" formation and improves the performance of the device. At the same time, the negative pressure generated when the water flows through the throat at high speed in the Venturi tube 601 can quickly draw the powder in the mixing chamber 604 into it. The powder is drawn in and instantly torn and dispersed by the high-speed water flow to improve the mixing effect. Moreover, the holes are designed to be evenly distributed around the periphery during the suction, which can achieve uniform suction of dry powder at multiple points along the water flow cross section. This avoids the "powder-water" problem caused by the traditional center-feed structure and further increases the performance of the device. It should be noted that when the dry powder enters the connecting mixing chamber 604, the operation of the rotating disk 624 can drive the mounting rod 617 and the inner equalization flap 618 to rotate, so that the device can turn over the dry powder inside the connecting mixing chamber 604, prevent it from accumulating at the bottom, and make the powder distribution more uniform. When crushing powder agglomerates, the powder compression chamber 603 is set horizontally to ensure the residence time of the powder in the chamber and to ensure that the agglomerates are completely crushed. After crushing the agglomerates, the angle can be adjusted to facilitate the rapid falling of the powder.

[0029] Reference Figure 2 , Figure 8 , Figure 9 and Figure 10 In a preferred embodiment, the quantitative drainage module 12 further includes: Drainage chamber 1201 is installed on discharge pump pipe 13, and adjustment base plate 1202 is installed inside drainage chamber 1201; A sealing ring 1206 is disposed on the adjusting base plate 1202, and the outer wall of the sealing ring 1206 is in contact with the interior of the drain chamber 1201.

[0030] In this invention, the quantitative drainage module 12 further includes: Multiple telescopic spring rods 1203 are all set on the mixing platform 1. One end of each telescopic spring rod 1203 is set on the adjusting base plate 1202. A drain hose 1204 is also set on the adjusting base plate 1202. A drain pump 1205 is set on the drain hose 1204. Adjusting frame 1211 is set on drain chamber 1201, and the interior of drain chamber 1201 has an installation cavity.

[0031] In this invention, the quantitative drainage module 12 further includes: A general-purpose motor 1207 is mounted on an adjusting frame 1211. The output shaft of the general-purpose motor 1207 is connected to an adjusting gear 1208 via a coupling. The adjusting gear 1208 is located inside the mounting cavity. The guide rod frame 1210 is mounted on the adjusting frame seat 1211. The interior of the guide rod frame 1210 is connected to the interior of the mounting cavity. The adjusting gear 1209 is mounted inside the guide rod frame 1210 and meshes with the adjusting gear 1208.

[0032] Specifically, during quantitative fluid drainage, the general-purpose motor 1207 is started according to the needs of fracturing operations. The general-purpose motor 1207 drives the adjusting gear 1208 to rotate. Since the adjusting gear 1208 meshes with the adjusting rack 1209, the general-purpose motor 1207 drives the adjusting rack 1209 to adjust the height in order to set the drainage volume. During the discharge process, the discharge pump pipe 13 delivers the mixed fracturing fluid to the discharge chamber 1201. As the fracturing fluid is discharged, the telescopic spring rod 1203 is compressed until the adjusting base plate 1202 moves to the position of the set adjusting tooth rod 1209 to complete the quantitative discharge operation. Then, the quantitative fracturing fluid is pumped through the discharge hose 1204 and the discharge pump 1205. At this time, as the fracturing fluid decreases, the telescopic spring rod 1203 also drives the adjusting base plate 1202 to reset, so as to facilitate subsequent quantitative discharge. In specific application scenarios, the quantitative drainage module 12 is suitable for fracturing operations, that is, in staged fracturing operations, after each stage of fracturing, the pump needs to be stopped for bridge plug setting, perforation and other operations. At this time, the required amount of liquid can be prepared in advance through the quantitative setting of the drainage chamber 1201, and discharged quickly at once when the pump is restarted, avoiding untimely liquid supply due to the lag in the start-up of the mixing device. At the same time, in operations with frequent start-ups and shutdowns, if continuous mixing and direct liquid supply are used, each start-up and shutdown will produce a section of unqualified "head and tail liquid". The quantitative mode of the drainage chamber 1201 can realize batch preparation and batch output, effectively reducing the amount of unqualified liquid generated and reducing raw material waste. It should be noted that the quantitative mode of the drainage chamber 1201 can be used as a buffer storage unit. When the upstream mixing tank 4 needs to be switched or cleaned, the quantitatively prepared mother liquor can continue to be supplied downstream, so as to achieve uninterrupted continuous construction.

[0033] Working principle: During use, the water inside the water tank 5 is transported to the venturi tube 601 and the mixing tank 4 through the water delivery pipe 2 and the water inlet pipe 8 respectively. At this time, the venturi tube 601 section performs the thickening and mixing operation of powder and water. After that, the fluid is transported to the mixing tank 4 through the fluid passage pipe 9. At the same time, the sand box 3 and the reagent tank 11 also transport the sand and reagent to the mixing tank 4 respectively for mixing. When the powder is thickened with water, it is transported to the powder pressing chamber 603 through the powder inlet 602. At this time, the servo motor 615 runs, which drives the rotating disk 624 to rotate, and further drives the mounting shaft 623 and the inner pressing roller 622 to rotate. The inner pressing roller 622, together with the center roller 625, can crush the lumps in the powder. After crushing, the electric telescopic rod 606 runs, which drives the powder pressing chamber 603 and the connecting plate frame 621 to rotate, so that the powder pressing chamber 603 can be adjusted in angle, so that the powder can enter the connecting mixing chamber 604 through the elastic telescopic tube 620 and the dry powder tube 619. After entering the connecting mixing chamber 604, the active motor 616 drives the active gear 612 to rotate. Since the active gear 612 meshes with the fixed gear ring 611, the active motor 616 can drive the fixed gear ring 611 and the annular disk 610 to rotate, which in turn drives the mounting rod 617 and the inner equalizing flap 618 to rotate, so as to agitate the powder entering the connecting mixing chamber 604, making its distribution more even and avoiding bottom accumulation. Then, when the water flows through the venturi tube 601, the negative pressure generated at its throat can quickly draw the powder in the connecting mixing chamber 604 into it for mixing, thereby completing the thickening and mixing. During quantitative fluid discharge, the general-purpose motor 1207 is started according to the needs of fracturing operation. The general-purpose motor 1207 drives the adjusting gear 1208 to rotate. Since the adjusting gear 1208 meshes with the adjusting rack 1209, the general-purpose motor 1207 drives the adjusting rack 1209 to adjust the height in order to set the fluid discharge volume. During the discharge process, the discharge pump pipe 13 delivers the mixed fracturing fluid to the discharge chamber 1201. As the fracturing fluid is discharged, the telescopic spring rod 1203 is compressed until the adjusting base plate 1202 moves to the position of the set adjusting tooth rod 1209 to complete the quantitative discharge operation. Then, the quantitative fracturing fluid is pumped through the discharge hose 1204 and the discharge pump 1205. At this time, as the fracturing fluid decreases, the telescopic spring rod 1203 also drives the adjusting base plate 1202 to reset, so as to facilitate subsequent quantitative discharge.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An online mixing device for preparing fracturing fluid using polymer dry powder, characterized in that, include: A mixing platform (1) is provided with a water tank (5), and the water tank (5) is provided with a water delivery pipe (2) and a water inlet pipe (8). Mixing tank (4), the mixing tank (4) is set on the mixing platform (1), the mixing platform (1) is also set with a medicine tank (11) and a sand box (3), one end of the water inlet pipe (8) is set on the mixing tank (4), and the mixing tank (4) is also set with a fluid passage pipe (9). Chemical reagent tube (10) is installed on the reagent tank (11) and the mixing tank (4). The same sand material tube (7) is also installed on the sand box (3) and the mixing tank (4). The discharge pump pipe (13) is installed on the mixing tank (4); The powder mixing unit (6) is installed on the water conveying pipe (2) and the fluid passage pipe (9). The powder mixing unit (6) includes a powder pressing chamber (603) and a venturi tube (601). The venturi tube (601) is located between the water conveying pipe (2) and the fluid passage pipe (9). A quantitative discharge module (12) is installed on the discharge pump pipe (13). The quantitative discharge module (12) includes an adjusting gear (1209) and an adjusting base plate (1202).

2. The online mixing device for preparing fracturing fluid using polymer dry powder according to claim 1, characterized in that, The powder mixing unit (6) further includes: A connecting mixing chamber (604) is provided on a venturi tube (601). The venturi tube (601) has multiple connecting holes, and each of the multiple connecting holes is provided with a powder passage pipe (609). The inner ring (608) is installed on the venturi tube (601), and the inner ring (608) and the mixing chamber (604) are provided with the same annular disk (610). A fixed toothed ring (611) is disposed on an annular disk (610), which is located outside the communicating mixing chamber (604).

3. The online mixing device for preparing fracturing fluid using polymer dry powder according to claim 2, characterized in that, The powder mixing unit (6) further includes: Multiple mounting rods (617) are provided on the annular disk (610) and are located inside the connecting mixing chamber (604); Multiple inner flaps (618) are respectively set on multiple mounting rods (617), and the outer walls of the multiple inner flaps (618) are in contact with the inner wall of the connecting mixing chamber (604).

4. The online mixing device for preparing fracturing fluid using polymer dry powder according to claim 3, characterized in that, The powder mixing unit (6) further includes: An active motor (616) is mounted on a connecting mixing chamber (604). The output shaft of the active motor (616) is connected to an active gear (612) via a coupling. The active gear (612) meshes with a fixed gear ring (611). A dry powder pipe (619) is provided on the connecting mixing chamber (604). A connecting rod bracket (613) is provided on the dry powder pipe (619), and two shaft members (614) are provided on the connecting rod bracket (613).

5. The online mixing device for preparing fracturing fluid using polymer dry powder according to claim 4, characterized in that, The powder mixing unit (6) further includes: Two connecting plate frames (621) are respectively set on two shaft members (614). The powder pressing chamber (603) is set on the two connecting plate frames (621). The powder pressing chamber (603) and the dry powder pipe (619) are provided with the same elastic telescopic pipe (620). The powder inlet (602) is located on the powder pressing chamber (603).

6. The online mixing device for preparing fracturing fluid using polymer dry powder according to claim 5, characterized in that, The powder mixing unit (6) further includes: The fastener (607) is provided on the venturi tube (601); Mounting component (605) is installed on the powder pressing chamber (603), and the mounting component (605) and the fixing component (607) are provided with the same electric telescopic rod (606).

7. The online mixing device for preparing fracturing fluid using polymer dry powder according to claim 6, characterized in that, The powder mixing unit (6) further includes: A servo motor (615) is installed on the powder pressing chamber (603). The output shaft of the servo motor (615) is connected to a rotating disk (624) via a coupling. The rotating disk (624) is located inside the powder pressing chamber (603). Multiple mounting shafts (623) are provided on a rotating disk (624), and an inner pressure powder roller (622) is provided on each of the multiple mounting shafts (623). The center roller (625) is located inside the powder pressing chamber (603), and the outer walls of multiple inner pressing rollers (622) are in contact with the outer wall of the center roller (625).

8. The online mixing device for preparing fracturing fluid using polymer dry powder according to claim 1, characterized in that, The quantitative drainage module (12) also includes: The drain chamber (1201) is located on the discharge pump pipe (13), and the adjusting base plate (1202) is located inside the drain chamber (1201). A sealing gasket (1206) is provided on the adjusting base plate (1202), and the outer wall of the sealing gasket (1206) is in contact with the interior of the drain chamber (1201).

9. An online mixing device for preparing fracturing fluid using polymer dry powder according to claim 8, characterized in that, The quantitative drainage module (12) also includes: Multiple telescopic spring rods (1203) are provided on the mixing platform (1). One end of each of the multiple telescopic spring rods (1203) is provided on the adjusting base plate (1202). A drain hose (1204) is also provided on the adjusting base plate (1202). A drain pump (1205) is provided on the drain hose (1204). Adjusting frame seat (1211) is set on drain chamber (1201), and the drain chamber (1201) has an installation cavity inside.

10. An online mixing device for preparing fracturing fluid using polymer dry powder according to claim 9, characterized in that, The quantitative drainage module (12) also includes: A general-purpose motor (1207) is mounted on an adjusting frame (1211). The output shaft of the general-purpose motor (1207) is connected to an adjusting gear (1208) via a coupling. The adjusting gear (1208) is located inside the mounting cavity. The guide rod frame (1210) is set on the adjusting frame seat (1211). The interior of the guide rod frame (1210) is connected to the interior of the mounting cavity. The adjusting rack (1209) is set inside the guide rod frame (1210) and meshes with the adjusting gear (1208).

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