Fracturing fluid injection device for oil exploitation

Abstract

The utility model relates to the technical field of fracturing fluid, and discloses an oil exploitation fracturing fluid injection device which comprises an outer cylinder, a top cover is arranged on the top wall face of the outer cylinder, a supporting rod is fixedly installed on the bottom wall face of the outer cylinder, and an injection pipe is further fixedly installed on the bottom wall face of the outer cylinder. The injection device comprises a plurality of bolts and a plurality of first sealing plates; the plurality of bolts and the plurality of first sealing plates are arranged in the cavity of the outer cylinder; comprising a driving device, the driving device comprises a plurality of second spur gears and a plurality of first spur gears, and the second spur gears and the first spur gears are all arranged on the upper portion of an outer cylinder. According to the fracturing fluid injection device, a plurality of second spur gears and a plurality of first spur gears can be driven by the driving device to drive a plurality of bolts and a plurality of first sealing plates to operate, and fracturing fluid can be injected into the ground through operation of the bolts and the first sealing plates.

Description

Technical Field

[0001] The utility model belongs to the technical field of fracturing fluids, and more specifically, relates to a fracturing fluid injection device for oil extraction. Background Art

[0002] During the process of oil extraction, fracturing fluids are usually used to assist the extraction operation. However, in the prior art, the inventor has found the following problems in use:

[0003] The prior art discloses a fracturing fluid injection device for oil extraction (202020475455.X), which includes an outer cylinder. An outer separation mechanism and an inner cylinder are installed inside the outer cylinder. The top end of the inner cylinder is fixed to the top wall of the outer cylinder. A cylinder is installed at the top of the inner cylinder. An injection cylinder connected to the output end of the cylinder is also hermetically connected inside the inner cylinder. The bottom end of the injection cylinder passes through the inner cylinder and extends to the outside of the outer cylinder. An inner separation mechanism is installed inside the injection cylinder.

[0004] The prior art can separate different types of fracturing fluids by using the outer separation mechanism and the inner cylinder, enabling workers to select the fracturing fluid to be injected for the injection operation. However, after the previously used fracturing fluid is injected, a part of it will remain on the inner wall surface of the inner cylinder. The next used fracturing fluid will be mixed with it, affecting the fracturing fluid injection operation. Moreover, in the prior art, the injection is manually performed by workers, and the injection quantity may not be controllable. At the same time, when a worker accidentally touches the equipment, it may also cause the equipment to perform the injection operation, which has certain risks and disadvantages in use.

[0005] In view of this, the present utility model is specifically proposed. Summary of the Utility Model

[0006] To solve the above technical problems, the basic concept of the technical solution adopted by the present utility model is as follows:

[0007] A fracturing fluid injection device for oil extraction, which:

[0008] Includes an outer cylinder. A top cover is provided on the top wall surface of the outer cylinder. A support rod is fixedly installed on the bottom wall surface of the outer cylinder. An injection pipe is also fixedly installed on the bottom wall surface of the outer cylinder:

[0009] Includes an injection device, which includes a plurality of bolts and a plurality of first sealing plates. The plurality of bolts and the plurality of first sealing plates are both arranged at the position inside the cavity of the outer cylinder;

[0010] Includes a driving device, which includes a plurality of second spur gears and a plurality of first spur gears. The second spur gears and the plurality of first spur gears are both arranged above the outer cylinder.

[0011] As a preferred embodiment of the present utility model, a storage plate is disposed in the cavity of the outer cylinder. The storage plate is in a state where the four side walls are hollowed out. A second sealing sleeve is fixedly installed on the side walls and the upper and lower side walls of the storage plate. A rotating rod is fixedly installed on the top wall of the storage plate, and the second sealing sleeve is attached to the inner wall surface of the cavity of the outer cylinder.

[0012] As a preferred embodiment of the present utility model, a second sealing plate is fixedly installed at each of the four cavity positions of the storage plate. The second sealing plate is triangular, and the side wall of the second sealing plate close to the outer cylinder is arc-shaped. The arc surface of the second sealing plate is attached to the inner wall surface of the cavity of the outer cylinder. An injection hole is opened on the top wall of each of the plurality of second sealing plates.

[0013] As a preferred embodiment of the present utility model, a plurality of the bolts are respectively disposed at the four cavity positions of the storage plate. The bolts penetrate through the second sealing plates and are rotatably connected to the second sealing plates. Two sealing rings are fixedly installed on the side walls of the bolts. The side walls of the two sealing rings close to each other are respectively attached to the upper and lower side walls of the second sealing plates. A plurality of first spur gears are fixedly installed on the top walls of the bolts.

[0014] As a preferred embodiment of the present utility model, a moving plate is threadedly connected below the bolt. The corresponding side walls of the moving plate are attached to the inner wall surface of the cavity of the storage plate. A pressing block is fixedly installed on the bottom wall of the moving plate. Two conical blocks are respectively fixedly installed on the bottom walls of the four cavities of the storage plate.

[0015] As a preferred embodiment of the present utility model, the side walls of the two conical blocks away from the storage plate are in a hollowed-out state. A torsion spring is fixedly installed in the cavity of the conical block. One end of each of the two torsion springs away from the conical block is fixedly installed with a first sealing sleeve. A first sealing plate is fixedly installed in the cavity of the first sealing sleeve. The side wall of the first sealing sleeve away from the conical block is arc-shaped and is attached to the inner wall surface of the cavity of the outer cylinder. The corresponding side walls of the first sealing sleeve are attached to the inner wall surface of the cavity of the storage plate.

[0016] As a preferred embodiment of the present utility model, a side plate is fixedly installed on the bottom wall of the top cover. A snap ring is fixedly installed on the bottom wall of the side plate. A card slot is opened on the top wall of the outer cylinder. The snap ring is movably connected to the card slot. A first through hole is opened on the top wall of the top cover at a position corresponding to the injection pipe. A plurality of second through holes are also opened on the top wall of the top cover in an annular array. The top wall of the rotating rod is fixedly connected to the bottom wall of the top cover.

[0017] As a preferred embodiment of the present utility model, an inlet pipe is fixedly installed in the cavity of each of the plurality of second perforations. The inlet pipe is also fixedly connected to the cavity of the injection hole. A piston is hermetically and movably connected to the upper cavity of each of the plurality of inlet pipes. A first fixing plate is fixedly installed on the top wall of the top cover at the position of the first perforation. A driving plate is arranged in the cavity of the first fixing plate. A driving motor is fixedly installed on the bottom wall of the driving plate. A second spur gear is fixedly installed on the output end of the driving motor. The driving motor can be meshed with a plurality of first spur gears.

[0018] As a preferred embodiment of the present utility model, two limiting grooves are formed on the left and right side walls in the cavity of the first fixing plate. A resilient plate is fixedly installed on each of the left and right side walls of the driving plate. The resilient plate is L-shaped. A limiting plate is fixedly installed on the lower wall of the mutually remote side of each of the two resilient plates. The limiting plate is snapped into the cavity of the limiting groove.

[0019] The present utility model has the following beneficial effects compared with the prior art:

[0020] 1. In summary, by providing the support rod, the injection pipe, the injection device and the driving device, the driving device can drive a plurality of second spur gears and a plurality of first spur gears to drive a plurality of bolts and a plurality of first sealing plates to operate. Through the operation of the plurality of bolts and the plurality of first sealing plates, the fracturing fluid can be injected into the ground. Compared with the prior art, it has the characteristics of convenient use and simple structure.

[0021] 2. In summary, by providing the first fixing plate, the storage plate, the rotating rod, the bolt, the moving plate, the first sealing plate, the second sealing plate, the first spur gear, the sealing ring, the pressing block, the first sealing sleeve, the conical block, the torsion spring and the second sealing sleeve, the rotation of the first spur gear can drive the bolt to rotate. The rotation of the bolt drives the pressing block to press the two first sealing plates, so that the fracturing fluid is injected into the ground through the injection pipe. It is convenient to use. By providing different chambers, different fracturing fluids can be stored, and the staff can also control the injection amount of the fracturing fluid. It is convenient to use and has a simple structure.

[0022] 3. In summary, by providing a top cover, an inlet pipe, a first fixing plate, a piston, a clamping groove, a side plate, a snap ring, a first through hole, a second through hole, a driving plate, a resilient plate, a driving motor, a second spur gear, an outer cylinder, and a limiting plate, the rotation of the output end of the driving motor can drive the second spur gear to rotate, the second spur gear can drive the first spur gear to rotate, and fracturing fluid can be injected into the cavity of the storage plate through the inlet pipe. When not in use, the staff can engage the two limiting plates with the two upper limiting grooves to prevent excessive fracturing fluid from being injected due to accidental contact. The staff can also rotate the top cover to inject different types of fracturing fluid into multiple cavities of the storage plate, which is convenient to use and has a simple structure.

[0023] The following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the drawings:

[0025] Figure 1 is a three-dimensional view of one side of the present utility model;

[0026] Figure 2 is a three-dimensional view of the other side of the present utility model;

[0027] Figure 3 is a connection diagram of the top cover 11 and the outer cylinder 10 of the present utility model;

[0028] Figure 4 is a three-dimensional view of the injection device and the driving device of the present utility model;

[0029] Figure 5 is a three-dimensional view of one side of the injection device of the present utility model;

[0030] Figure 6 is a three-dimensional view of the other side of the injection device of the present utility model;

[0031] Figure 7 is a three-dimensional view of the storage plate 21 of the present utility model;

[0032] Figure 8 is a three-dimensional view of one side of the driving device of the present utility model;

[0033] Figure 9 is a three-dimensional view of the other side of the driving device of the present utility model.

[0034] In the figure: 10, outer cylinder; 11, top cover; 13, inlet pipe; 14, first fixing plate; 15, support rod; 16, injection pipe; 17, side plate; 18, snap ring; 19, first perforation; 20, second perforation; 21, storage plate; 22, rotating rod; 23, bolt; 24, moving plate; 25, first sealing plate; 26, second sealing plate; 27, first spur gear; 28, injection hole; 29, sealing ring; 31, pressing block; 32, first sealing sleeve; 33, conical block; 34, torsion spring; 35, second sealing sleeve; 36, driving plate; 37, resilient plate; 38, driving motor; 39, second spur gear; 40, limiting groove; 41, limiting plate; 42, clamping groove; 43, piston. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model.

[0036] As Figure 1 and Figure 2 shown, a fracturing fluid injection device for oil extraction, which:

[0037] includes an outer cylinder 10, a top cover 11 is provided on the top wall surface of the outer cylinder 10, a support rod 15 is fixedly installed on the bottom wall surface of the outer cylinder 10, and an injection pipe 16 is also fixedly installed on the bottom wall surface of the outer cylinder 10:

[0038] includes an injection device, the injection device includes a plurality of bolts 23 and a plurality of first sealing plates 25, and the plurality of bolts 23 and the plurality of first sealing plates 25 are both arranged at the position inside the outer cylinder 10;

[0039] includes a driving device, the driving device includes a plurality of second spur gears 39 and a plurality of first spur gears 27, and the second spur gears 39 and the plurality of first spur gears 27 are both arranged above the outer cylinder 10.

[0040] It should be noted that: the outer cylinder 10 has been disclosed in a fracturing fluid injection device for oil extraction (202020475455.X), and will not be elaborated here.

[0041] During specific use, the support rod 15 is used to support the outer cylinder 10. By inserting the injection pipe 16 into the ground for injection operations, the injection device can inject fracturing fluid into the ground through a plurality of bolts 23 and a plurality of first sealing plates 25, and the driving device can drive a plurality of bolts 23 and a plurality of first sealing plates 25 to operate through a plurality of sealing rings 29 and a plurality of resilient plates 37.

[0042] In summary, by setting up the support rod 15, the injection pipe 16, the injection device and the driving device, the driving device can drive a plurality of second spur gears 39 and a plurality of first spur gears 27 to drive a plurality of bolts 23 and a plurality of first sealing plates 25 to operate. Through the operation of the plurality of bolts 23 and the plurality of first sealing plates 25, the fracturing fluid can be injected into the ground. Compared with the prior art, it has the characteristics of convenient use and simple structure.

[0043] As Figure 5 , Figure 6 , Figure 7 and Figure 8 shown, a storage plate 21 is arranged in the cavity of the outer cylinder 10. The storage plate 21 is in a state where the four side walls are hollowed out. A second sealing sleeve 35 is fixedly installed on the side wall and the upper and lower side walls of the storage plate 21. A rotating rod 22 is fixedly installed on the top wall of the storage plate 21. The second sealing sleeve 35 is attached to the inner wall surface of the cavity of the outer cylinder 10.

[0044] A second sealing plate 26 is fixedly installed at the positions of the four cavities of the storage plate 21. The second sealing plate 26 is triangular. The side wall of the second sealing plate 26 close to the outer cylinder 10 is arc-shaped. The arc surface of the second sealing plate 26 is attached to the inner wall surface of the cavity of the outer cylinder 10. An injection hole 28 is opened on the top wall of each of the plurality of second sealing plates 26.

[0045] A plurality of the bolts 23 are respectively arranged at the positions of the four cavities of the storage plate 21. The bolts 23 penetrate through the second sealing plates 26 and are rotatably connected to the second sealing plates 26. Two sealing rings 29 are fixedly installed on the side wall of the bolts 23. The side walls of the two sealing rings 29 close to each other are respectively attached to the upper and lower side walls of the second sealing plates 26. A plurality of first spur gears 27 are fixedly installed on the top wall of the bolts 23.

[0046] A moving plate 24 is threadedly connected to the lower position of the bolt 23. The corresponding two side walls of the moving plate 24 are attached to the inner wall surface of the cavity of the storage plate 21. A pressing block 31 is fixedly installed on the bottom wall of the moving plate 24. Two conical blocks 33 are respectively fixedly installed on the bottom walls of the four cavities of the storage plate 21.

[0047] The side walls of the two conical blocks 33 away from the storage plate 21 are in a hollow state. A torsion spring 34 is fixedly installed in the cavity of the conical block 33. One end of each of the two torsion springs 34 away from the conical block 33 is fixedly installed with a first sealing sleeve 32. The first sealing plate 25 is fixedly installed in the cavity of the first sealing sleeve 32. The side wall of the first sealing sleeve 32 away from the conical block 33 is arc-shaped and is attached to the inner wall surface of the cavity of the outer cylinder 10. The corresponding two side walls of the first sealing sleeve 32 are attached to the inner wall surface of the cavity of the storage plate 21.

[0048] During specific use, when the staff needs to inject fracturing fluid underground, they can rotate the storage plate 21. The specific rotation method of the storage plate 21 will be discussed below. When the storage plate 21 rotates, it can drive the fracturing fluid in its cavity to rotate. Through the first sealing plate 25 on the side wall of the storage plate 21, a sealing effect can be achieved. By rotating the storage plate 21, the fracturing fluid is rotated to a position corresponding to the injection pipe 16. Then, the first spur gear 27 can be rotated. The specific rotation method of the first spur gear 27 will be discussed below. When the first spur gear 27 rotates, it can drive the bolt 23 to rotate. The sealing ring 29 can play a sealing role between the second sealing plate 26 and the bolt 23. The rotation of the bolt 23 can drive the moving plate 24, which is threadedly connected to the bolt 23, to move up and down. The moving plate 24 cannot rotate due to the limitation of the storage plate 21. When the moving plate 24 moves up and down, it can drive the pressing block 31 to move up and down. The up and down movement of the pressing block 31 can push down the positions where the two first sealing plates 25 are close to each other. The tapered block 33 can limit the first sealing plate 25 and the first sealing sleeve 32 through the torsion spring 34. The first sealing sleeve 32 can not only seal the fracturing fluid, but also be extruded and deformed when the first sealing plate 25 rotates, so as to cooperate with the rotation of the first sealing plate 25. When the two first sealing plates 25 rotate, the fracturing fluid between the first sealing plate 25 and the second sealing plate 26 can flow downward through the openings of the two first sealing plates 25 and be injected underground through the injection pipe 16 inserted into the ground. When the pressing block 31 moves upward, the two first sealing plates 25 can be disengaged, and the two first sealing plates 25 can automatically reset under the action of the torsion spring 34.

[0049] In summary, by setting the first fixing plate 14, the storage plate 21, the rotating rod 22, the bolt 23, the moving plate 24, the first sealing plate 25, the second sealing plate 26, the first spur gear 27, the sealing ring 29, the pressing block 31, the first sealing sleeve 32, the tapered block 33, the torsion spring 34 and the second sealing sleeve 35, the rotation of the first spur gear 27 can drive the bolt 23 to rotate, and the rotation of the bolt 23 can drive the pressing block 31 to press the two first sealing plates 25, so that the fracturing fluid is injected underground through the injection pipe 16. It is convenient to use. By setting different chambers, different fracturing fluids can be stored, and the staff can also control the injection volume of the fracturing fluid. It is convenient to use and has a simple structure.

[0050] Such as Figure 1 、 Figure 3 、 Figure 4 and Figure 9As shown, a side plate 17 is fixedly installed on the bottom wall surface of the top cover 11. A snap ring 18 is fixedly installed on the bottom wall surface of the side plate 17. A slot 42 is formed on the top wall surface of the outer cylinder 10. The snap ring 18 is movably connected to the slot 42. A first through hole 19 is formed on the top wall surface of the top cover 11 at a position corresponding to the injection pipe 16. A plurality of second through holes 20 are also formed on the top wall surface of the top cover 11 in an annular array. The top wall surface of the rotating rod 22 is fixedly connected to the bottom wall surface of the top cover 11.

[0051] A guiding pipe 13 is fixedly installed in the cavity of each of the plurality of second through holes 20. The guiding pipe 13 is also fixedly connected to the cavity of the injection hole 28. A piston 43 is hermetically and movably connected to the upper cavity of each of the plurality of guiding pipes 13. A first fixing plate 14 is fixedly installed on the top wall surface of the top cover 11 at the position of the first through hole 19. A driving plate 36 is arranged in the cavity of the first fixing plate 14. A driving motor 38 is fixedly installed on the bottom wall surface of the driving plate 36. A second spur gear 39 is fixedly installed on the output end of the driving motor 38. The driving motor 38 can mesh with a plurality of first spur gears 27.

[0052] Two limiting grooves 40 are formed on the left and right side wall surfaces in the cavity of the first fixing plate 14. A resilient plate 37 is fixedly installed on each of the left and right side wall surfaces of the driving plate 36. The resilient plate 37 is L-shaped. A limiting plate 41 is fixedly installed on the lower wall surface of each of the two resilient plates 37 away from each other. The limiting plate 41 is snapped into the cavity of the limiting groove 40.

[0053] During specific use, when the staff needs to rotate the first spur gear 27, they can press the two resilient plates 37, causing the two resilient plates 37 to approach each other and disengaging the two limit plates 41 from the two upper limit slots 40. Then, they press the drive plate 36 downward to align the positions of the two limit plates 41 with the positions of the two lower limit slots 40. Then, they release the two resilient plates 37 to allow the two limit plates 41 to snap into the two lower limit slots 40. The movement of the drive plate 36 will also drive the drive motor 38 to move. The movement of the drive motor 38 can drive the second spur gear 39 to move. In this way, when the drive plate 36 snaps the two limit plates 41 into the two lower limit slots 40, the second spur gear 39 meshes with the corresponding first spur gear 27. When the output end of the drive motor 38 rotates, it can drive the second spur gear 39 to rotate. The rotation of the second spur gear 39 can drive the first spur gear 27 meshing with it to rotate, thereby driving the first spur gear 27 to rotate. When the staff needs to inject fracturing fluid into the cavity of the storage plate 21, they can pull the pistons 43 on the multiple inlet pipes 13 off the inlet pipes 13, and then inject the fracturing fluid into the cavity of the storage plate 21 through the inlet pipes 13 and the injection holes 28. Through the connection between the snap ring 18 and the card slot 42, the top cover 11 can rotate on the top wall surface of the outer cylinder 10. The rotation of the top cover 11 can drive the rotating rod 22 to rotate. The rotation of the rotating rod 22 can drive the storage plate 21 to rotate. The side plate 17 can limit the snap ring 18. The drive motor 38 is electrically connected to the power supply and the switch.

[0054] In summary, by setting the top cover 11, inlet pipes 13, first fixing plate 14, pistons 43, card slots 42, side plates 17, snap rings 18, first through holes 19, second through holes 20, drive plates 36, resilient plates 37, drive motors 38, second spur gears 39, outer cylinders 10, and limit plates 41, the rotation of the output end of the drive motor 38 can drive the second spur gear 39 to rotate, the second spur gear 39 can drive the first spur gear 27 to rotate, and the fracturing fluid can also be injected into the cavity of the storage plate 21 through the inlet pipes 13. When not in use, the staff can engage the two limit plates 41 with the two upper limit slots 40 to prevent excessive injection of fracturing fluid due to accidental contact. The staff can also rotate the top cover 11 to inject different types of fracturing fluid into multiple cavities of the storage plate 21. It is convenient to use and has a simple structure.

[0055] It can be understood that the present utility model is described by means of some embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present utility model. Additionally, under the teachings of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the present utility model.

Claims

1. An injection device for fracturing fluid in oil exploitation, characterized in that, It is described that: It includes an outer cylinder (10). A top cover (11) is arranged on the top wall surface of the outer cylinder (10). A support rod (15) is fixedly installed on the bottom wall surface of the outer cylinder (10). An injection pipe (16) is also fixedly installed on the bottom wall surface of the outer cylinder (10): It includes an injection device. The injection device includes a plurality of bolts (23) and a plurality of first sealing plates (25). The plurality of bolts (23) and the plurality of first sealing plates (25) are both arranged at the position inside the cavity of the outer cylinder (10); It includes a driving device. The driving device includes a plurality of second spur gears (39) and a plurality of first spur gears (27). The second spur gears (39) and the plurality of first spur gears (27) are both arranged above the outer cylinder (10).

2. The oil extraction fracturing fluid injection device according to claim 1, wherein A storage plate (21) is arranged inside the cavity of the outer cylinder (10). The storage plate (21) is in a state where the four side wall surfaces are hollowed out. A second sealing sleeve (35) is fixedly installed on the side wall and the upper and lower side wall surfaces of the storage plate (21). A rotating rod (22) is fixedly installed on the top wall surface of the storage plate (21). The second sealing sleeve (35) is attached to the inner wall surface of the cavity of the outer cylinder (10).

3. The oil extraction fracturing fluid injection device according to claim 2, characterized in that A second sealing plate (26) is fixedly installed at the four inner cavity positions of the storage plate (21). The second sealing plate (26) is triangular. The side wall surface of the second sealing plate (26) close to the outer cylinder (10) is arc-shaped. The arc-shaped surface of the second sealing plate (26) is attached to the inner wall surface of the cavity of the outer cylinder (10). An injection hole (28) is opened on the top wall surface of the plurality of second sealing plates (26).

4. The fracturing fluid injection device for oil extraction according to claim 3, characterized in that, The plurality of bolts (23) are respectively arranged at the four inner cavity positions of the storage plate (21). The bolt (23) penetrates through the second sealing plate (26) and is rotatably connected to the second sealing plate (26). Two sealing rings (29) are fixedly installed on the side wall of the bolt (23). The side wall surfaces of the two sealing rings (29) close to each other are respectively attached to the upper and lower side wall surfaces of the second sealing plate (26). The plurality of first spur gears (27) are fixedly installed on the top wall surface of the bolt (23).

5. The oil extraction fracturing fluid injection device according to claim 4, characterized in that, A moving plate (24) is threadedly connected to the lower position of the bolt (23). The corresponding two side wall surfaces of the moving plate (24) are attached to the inner wall surface of the cavity of the storage plate (21). A pressing block (31) is fixedly installed on the bottom wall surface of the moving plate (24). Two conical blocks (33) are respectively fixedly installed on the bottom wall surfaces of the four inner cavities of the storage plate (21).

6. The oil extraction fracturing fluid injection device according to claim 5, characterized in that, The side wall surface of the two conical blocks (33) away from the storage plate (21) is in a hollowed-out state. A torsion spring (34) is fixedly installed inside the cavity of the conical block (33). One end of the two torsion springs (34) away from the conical block (33) is fixedly installed with a first sealing sleeve (32). The first sealing plate (25) is fixedly installed inside the cavity of the first sealing sleeve (32). The side wall surface of the first sealing sleeve (32) away from the conical block (33) is arc-shaped and is attached to the inner wall surface of the cavity of the outer cylinder (10). The corresponding two side wall surfaces of the first sealing sleeve (32) are attached to the inner wall surface of the cavity of the storage plate (21).

7. The fracturing fluid injection device for oil extraction according to claim 1, wherein A side plate (17) is fixedly installed on the bottom wall surface of the top cover (11). A snap ring (18) is fixedly installed on the bottom wall surface of the side plate (17). A slot (42) is formed on the top wall surface of the outer cylinder (10). The snap ring (18) is movably connected to the slot (42). A first through hole (19) is formed on the top wall surface of the top cover (11) at a position corresponding to the injection pipe (16). A plurality of second through holes (20) are formed on the top wall surface of the top cover (11) in an annular array. The top wall surface of the rotating rod (22) is fixedly connected to the bottom wall surface of the top cover (11).

8. The fracturing fluid injection device for oil extraction according to claim 7, characterized in that, An inlet pipe (13) is fixedly installed in the cavity of each of the plurality of second through holes (20). The inlet pipe (13) is also fixedly connected to the cavity of the injection hole (28). A piston (43) is hermetically and movably connected to the upper cavity of each of the plurality of inlet pipes (13). A first fixing plate (14) is fixedly installed on the top wall surface of the top cover (11) at the position of the first through hole (19). A driving plate (36) is arranged in the cavity of the first fixing plate (14). A driving motor (38) is fixedly installed on the bottom wall surface of the driving plate (36). A second spur gear (39) is fixedly installed on the output end of the driving motor (38). The driving motor (38) can mesh with a plurality of first spur gears (27).

9. The fracturing fluid injection device for oil extraction according to claim 8, characterized in that, Two limiting slots (40) are formed on the left and right side wall surfaces in the cavity of the first fixing plate (14). A resilient plate (37) is fixedly installed on each of the left and right side wall surfaces of the driving plate (36). The resilient plate (37) is L-shaped. A limiting plate (41) is fixedly installed on the lower wall surface of each of the two resilient plates (37) away from each other. The limiting plate (41) is snapped into the cavity of the limiting slot (40).

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