Oil casing pressurizing device

Abstract

The present invention relates to the technical field of oil drilling and production, and specifically to an oil casing pressurizing device, comprising a base, a first fixed plate provided above the base, and a plurality of freely retractable electric telescopic rods fixedly connected between the first fixed plate and the base, a limiting mechanism for limiting the position of the casing is fixedly installed on the upper ends of the base and the first fixed plate, a plurality of abutting mechanisms for abutting and moving the casing are rotatably installed inside the base and the first fixed plate, an abutting wheel is provided between each two groups of abutting mechanisms, two groups of fixed casings are fixedly connected to the outer walls of the abutting wheels, and each two groups of abutting mechanisms can abut and fix the corresponding inner walls of the fixed casings, and when the limiting mechanism moves, the abutting wheel is driven by the abutting mechanism to limit the casing, so that the casing can be moved into the interior of the shaft easily, simply and conveniently, and manual work efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling and exploitation, in particular to an oil casing pressurizing device. Background Art

[0002] When drilling horizontal wells, especially extended-reach horizontal wells, the lowering of the three-way casing is subject to the large friction resistance of the wellbore wall and the downhole buoyancy due to the influence of the wellbore trajectory and horizontality. At this time, it is difficult to continue lowering the casing relying on its own weight. In this case, the top drive equipment is often used to apply pressure to press the casing into place.

[0003] Since the traditional pressurizing device can only limit and fix the casing of one caliber when in use, it has limitations. In addition, when using physical pressurization, the traditional pressurizing tool will be severely worn after long-term use, and it takes time to replace it, which will waste a lot of time and greatly reduce work efficiency.

[0004] Chinese patent (Announcement No. CN116498212B), this patented technology is specifically a petroleum casing pressurizing device, including: a skid-mounted chassis, a drive assembly, an adjusting gearbox, a transmission box and an actuator, the input end of the adjusting gearbox is connected to the drive assembly, and the output end is connected to the transmission box, the actuator includes a slip sleeve and multiple rubber rollers, the adjusting gearbox is internally provided with a shift fork, a gear mechanism and a clutch mechanism, the gear mechanism includes a main drive shaft and a secondary drive shaft, the clutch mechanism includes two sets of identical push-type clutches, the two sets of push-type clutches are respectively installed on the main drive shaft and the secondary drive shaft and the installation directions are opposite, the main drive shaft and the secondary drive shaft are also provided with a forward part gear mechanism and a reverse part gear mechanism, the casing pressurizing device of this invention can realize continuous downward pressure operation on the casing, and can also slowly lift the downward pressure, and can quickly switch the pipe lowering operation mode when the downhole pressure is too high, without affecting the construction process.

[0005] According to the above scheme, it can be seen that when the above scheme is used, the size of the casing limit is limited when the casing is fixed, which makes it inconvenient to replace casings of various calibers. Moreover, when the casing is used for too long, the casing will wear the rubber rod more seriously, and replacement will be more troublesome and time-consuming. In order to solve the problem that it is impossible to limit the casing of various calibers and the rubber rod is seriously worn and replaced, a petroleum casing pressurizing device is proposed. Summary of the Invention

[0006] The object of the present invention is to provide a petroleum casing pressurizing device to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A petroleum casing pressurizing device includes a base, a first fixed plate disposed above the base, and a plurality of freely retractable electric telescopic rods fixedly connected between the first fixed plate and the base. A limiting mechanism capable of limiting the position of the casing is fixedly mounted on the upper ends of both the base and the first fixed plate. A plurality of abutment mechanisms capable of abutting and moving the casing are rotatably mounted within the base and the first fixed plate, and an abutment wheel is disposed between each pair of the abutment mechanisms.

[0009] Two groups of fixed sleeves are fixedly connected to the outer wall of the abutment wheel, and each two groups of the abutment mechanisms can abut and fix on the inner walls of the corresponding fixed sleeves. When the limiting mechanism moves, the abutment mechanism drives the abutment wheel to limit the sleeve. When one group of abutment wheels rotates, the sleeve can be pressurized to move toward the inside of the shaft.

[0010] As a further feature of this solution, both groups of the limiting mechanisms include a third fixed plate, and the two groups of the third fixed plates are fixedly installed inside the first fixed plate and the base respectively. The upper end of the third fixed plate is fixedly connected to the second fixed plate, the bottom of the second fixed plate is fixedly connected to a fixed shell, and the inner wall of the fixed shell is rotatably connected to a reverse gear ring. The limiting mechanism can fix and limit the sleeve, which is simple and convenient.

[0011] As a further feature of this solution, the bottom of the reverse gear ring is fixedly connected to a spur gear ring, the upper end of the spur gear ring is rotatably connected to the bottom of the fixed shell, the upper end of the third fixed disk is fixedly installed with a second drive motor, the output end of the second drive motor is fixedly connected to a transmission gear, and the transmission gear and the spur gear ring are meshed with each other, the inner wall of the third fixed disk is fixedly installed with a fixed chassis, the upper end surface of the fixed chassis is rotatably connected to a number of power gears, each group of the power gears are meshed with the reverse gear ring, and power is provided by the drive motor, no manual labor is required, and the work of the staff is convenient.

[0012] As a further feature of this solution, a number of moving bars are slidably connected to the upper end of the second fixed plate, and a rack is fixedly connected to the outer wall of the moving bar. Each group of the racks is meshed with the corresponding power gear. The opposite ends of the several moving bars are fixedly connected to a first fixed block, and the outer wall of the first fixed block is fixedly connected to two groups of retractable arms with retractable functions. Since the retractable arms are in a retracted state, the two groups of retractable arms can tightly fix and limit the abutment wheels.

[0013] As a further feature of this solution, each group of the abutment mechanisms includes a mounting disc, which is rotatably mounted on the outer wall of the corresponding retractable arm. The end of the mounting disc away from the retractable arm is fixedly connected to a threaded rod, and the end of the mounting disc away from the retractable arm is also fixedly connected to two groups of telescopic arms. The two groups of telescopic arms can limit the mounting disc and prevent the mounting disc from rotating.

[0014] As a further feature of this solution, an abutment disk is fixedly connected between the two groups of telescopic arms, a second return spring is fixedly connected between the abutment disk and the mounting disc, a rotating round block is threadedly connected to the outer wall of the threaded rod, and the rotating round block is fixedly connected to a toothed disk at one end opposite to the abutment disk, and the two groups of toothed disks are adapted to each other, and the rotating round block is rotatably connected to a moving block at one end away from the toothed disk. When the two groups of toothed disks are engaged, the teeth between the toothed disks will be tightly engaged and will not rotate easily.

[0015] As a further step of this solution, the end of the threaded rod away from the mounting disc is fixedly connected to a second fixed block, and the second fixed block and the movable block abut against each other, the outer wall of the movable block is rotatably connected to a plurality of first rotating arms, the outer wall of the second fixed block is rotatably connected to a plurality of second rotating arms, and the outer wall of the second fixed block is provided with a plurality of second abutting curved blocks, and each group of the second abutting curved blocks is rotatably connected to the corresponding first rotating arm and second rotating arm at one end close to the second fixed block, and the shape of the second abutting curved block is an arc shape, which can better fit and abut against the inner wall of the fixed sleeve.

[0016] As a further embodiment of this solution, a group of the retractable arms are fixedly connected to a fixing frame at the bottom, a first drive motor is fixedly installed on the upper end of the fixing frame, a first pulley is fixedly connected to the output end of the first drive motor, a second pulley is rotatably connected inside the retractable arm, and the second pulley is fixedly connected to the corresponding mounting disc, a transmission belt is provided with a tensioning sleeve between the second pulley and the first pulley, the transmission belt can better transmit power and is also easy to replace.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When the present invention is used, the sleeve is placed in the center of the inner part of the reverse gear ring. At this time, when all the movable bars move toward the direction of the sleeve, the movable bars will drive the corresponding two groups of contraction arms to move through the first fixed block. The two groups of contraction arms will drive the contraction arms to move toward the direction of the sleeve, and the outer wall of the abutment wheel will abut against the sleeve. In this way, sleeves of various calibers can be fixed and limited.

[0019] 2. When the present invention is used, if the abutment wheel is damaged due to long-term use, the abutment disk is pulled to disengage the toothed disk between the abutment disk and the rotating circular block. When all the second abutment curved blocks are moved closer and contracted toward the moving block, the first abutment curved block is disengaged from the abutment with the inner wall of the fixed sleeve. It is only necessary to pull the two sets of contraction arms so that the contraction arms drive the entire abutment mechanism to disengage from the interior of the fixed sleeve, and the entire abutment wheel can be taken out. This is simple and quick, and the abutment wheel can be replaced more quickly, breaking the limitation of traditional abutment wheels that are inconvenient to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of an oil casing pressurizing device.

[0021] Figure 2 This is a top view of an oil casing pressurizing device.

[0022] Figure 3 This is a top view of the limiting mechanism in an oil casing pressurizing device.

[0023] Figure 4 for Figure 3 Enlarged schematic diagram of point A in the middle.

[0024] Figure 5 This is a schematic diagram of the internal structure of a movable box in an oil casing pressurizing device.

[0025] Figure 6 The figure is a structural diagram of a limit mechanism in a petroleum casing pressurizing device.

[0026] Figure 7 This is a schematic diagram of the position structure of the contraction arm in an oil casing pressurization device.

[0027] Figure 8 This is a schematic diagram of the position structure of the first fixed block in an oil casing pressurizing device.

[0028] Figure 9 The figure is a structural diagram of an abutment mechanism in a petroleum casing pressurizing device.

[0029] Figure 10 This is a disassembled schematic diagram of the abutment mechanism in a petroleum casing pressurizing device.

[0030] Figure 11 for Figure 3 Enlarged schematic diagram of point B in the middle.

[0031] In the figure: 1. Base; 2. Electric telescopic rod; 3. First fixed plate; 4. Display panel; 6. Second fixed plate; 7. Spur gear ring; 8. Reverse gear ring; 9. Fixed chassis; 10. Power gear; 11. First drive motor; 12. Moving bar; 13. Rack; 14. Third fixed plate; 15. Fixed housing.

[0032] 16. Moving box; 17. First pulley; 18. Sliding block; 19. Abutting wheel; 20. Retracting arm; 21. First fixed block; 22. Second drive motor; 23. Transmission gear; 24. Fixed sleeve; 25. First abutting curved block; 26. First return spring; 27. Second abutting curved block;

[0033] 28. Second return spring; 29. ​​Threaded rod; 30. Mounting disc; 31. Telescopic arm; 32. Abutment disc; 33. Rotating round block; 34. First rotating arm; 35. Second fixed block; 36. Second rotating arm; 37. Moving block; 38. Toothed disc; 39. Second pulley; 40. Transmission belt; 41. Fixed frame; 101. Limiting mechanism; 201. Abutment mechanism. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figure 1 、 2 As shown in Figures 3 and 4, in an embodiment of the present invention, an oil casing pressurizing device includes a base 1, a first fixed plate 3 is provided above the base 1, and a plurality of freely retractable electric telescopic rods 2 are fixedly connected between the first fixed plate 3 and the base 1, and the plurality of electric telescopic rods 2 are distributed circumferentially between the base 1 and the first fixed plate 3. A limiting mechanism 101 capable of limiting the position of the casing is fixedly installed on the upper ends of the base 1 and the first fixed plate 3, and a plurality of freely retractable electric telescopic rods 2 are rotatably installed inside the base 1 and the first fixed plate 3. The abutment mechanism 201 for abutting movement of the tube is provided with an abutment wheel 19 between each two groups of abutment mechanisms 201. Two groups of fixed sleeves 24 are fixedly connected to the outer wall of the abutment wheel 19, and each two groups of abutment mechanisms 201 can abut and fix the inner wall of the corresponding fixed sleeve 24. When the limiting mechanism 101 moves, the abutment wheel 19 is driven by the abutment mechanism 201 to limit the sleeve. When one group of abutment wheels 19 rotates, the sleeve can be pressurized to move toward the inside of the vertical shaft. A display panel 4 is also fixedly installed on the upper end surface of the base 1.

[0036] See also Figure 2 、 3As shown in Figures 5 and 6, the two groups of limiting mechanisms 101 include a third fixed plate 14, and the two groups of third fixed plates 14 are fixedly installed on the first fixed plate 3 and the inside of the base 1 by nuts, the upper end of the third fixed plate 14 is fixedly connected to the second fixed plate 6, and the bottom of the second fixed plate 6 is fixedly connected to the fixed shell 15. A number of weight-reducing holes are provided inside the third fixed plate 14 and the second fixed plate 6. The weight-reducing holes can greatly reduce the weight of the second fixed plate 6 and the third fixed plate 14, reduce the weight of transportation, and improve work efficiency. The inner wall of the fixed shell 15 is rotatably connected to the anti-gear through the rotating shaft. Ring 8, the bottom of the counter-gear ring 8 is fixedly connected to the spur gear ring 7, the upper end of the spur gear ring 7 is rotatably connected to the bottom of the fixed shell 15, the upper end of the third fixed disk 14 is fixedly mounted with a second drive motor 22, the output end of the second drive motor 22 is fixedly connected with a transmission gear 23, and the transmission gear 23 and the spur gear ring 7 are meshed with each other, the inner wall of the third fixed disk 14 is fixedly mounted with a fixed chassis 9, the upper end surface of the fixed chassis 9 is rotatably connected to a plurality of power gears 10 through a rotating shaft, and the plurality of power gears 10 are distributed in a circular ring at the upper end of the fixed chassis 9, and each group of power gears 10 are meshed with the counter-gear ring 8;

[0037] See also Figure 5 、 6 As shown in Figure 7, the second fixed plate 6 is slidably connected to a plurality of moving bars 12 at the upper end. Specifically, a plurality of moving boxes 16 are fixedly connected to the upper end of the second fixed plate 6. A matching groove is provided inside the moving box 16. A sliding block 18 is fixedly connected to the bottom of the moving bar 12. The sliding block 18 is slidably installed inside the matching groove. More specifically, the inner wall of the matching groove and the outer wall of the sliding block 18 are smeared with lubricating oil. When the moving bar 12 moves, it will drive the sliding block 18 to slide on the inner wall of the matching groove, and the matching groove can limit the moving bar 12 through the sliding block 18, thereby improving the stability of the moving bar 12 when moving, and can also be used to control the moving bar 12. It has a guiding function, and the lubricating oil can also reduce the friction between the sliding block 18 and the matching groove, thereby increasing the service life of the sliding block 18. A plurality of moving bars 12 are distributed circumferentially on the upper end of the second fixed disk 6. The outer wall of the moving bar 12 is fixedly connected to a rack 13. Each set of racks 13 is meshed with the corresponding power gear 10. The opposite ends of the plurality of moving bars 12 are fixedly connected to a first fixed block 21. The outer wall of the first fixed block 21 is fixedly connected to two sets of retracting arms 20 with a retracting function, and a pull spring is installed inside the retracting arm 20. The two sets of retracting arms 20 are symmetrically distributed on the outer wall of the first fixed block 21.

[0038] See also Figure 7 、 8As shown in , 9 and 10, each set of abutment mechanisms 201 includes a mounting disc 30, which is rotatably mounted on the outer wall of the corresponding retractable arm 20, and the end of the mounting disc 30 away from the retractable arm 20 is fixedly connected to the threaded rod 29, and the end of the mounting disc 30 away from the retractable arm 20 is also fixedly connected to two sets of telescopic arms 31, and the two sets of telescopic arms 31 are symmetrically distributed on the outer wall of the mounting disc 30, and an abutment disk 32 is fixedly connected between the two sets of telescopic arms 31, and a second return spring 28 is fixedly connected between the abutment disk 32 and the mounting disc 30, and the second return spring 28 is sleeved on the outer surface of the threaded rod 29, and a rotating round block 33 is threadedly connected to the outer wall of the threaded rod 29, and the end of the rotating round block 33 opposite to the abutment disk 32 is fixedly connected to a toothed disk 38. , and the two groups of toothed discs 38 are adapted, the end of the rotating circular block 33 away from the toothed disc 38 is rotatably connected to the moving block 37, the moving block 37 is sleeved on the outer surface of the threaded rod 29, the end of the threaded rod 29 away from the mounting disc 30 is fixedly connected to the second fixed block 35, and the second fixed block 35 and the moving block 37 abut each other, the outer wall of the moving block 37 is rotatably connected to a plurality of first rotating arms 34 through a rotating shaft, the outer wall of the second fixed block 35 is also rotatably connected to a plurality of second rotating arms 36 through a rotating shaft, the outer wall of the second fixed block 35 is provided with a plurality of second abutting curved blocks 27, and the plurality of second abutting curved blocks 27 are distributed in a circular ring, and the end of each group of second abutting curved blocks 27 close to the second fixed block 35 is rotatably connected to the corresponding first rotating arm 34 and second rotating arm 36;

[0039] See also Figure 9 、 10 As shown, a first abutting arc block 25 is provided on the side of the second abutting arc block 27 away from the first rotating arm 34, and one end of the first abutting arc block 25 and the second abutting arc block 27 is fixedly connected to a plurality of first return springs 26, and the second abutting arc block 27 and the first abutting arc block 25 are both arc-shaped, and the end of the first abutting arc block 25 away from the second abutting arc block 27 abuts against the inner wall of the fixed sleeve 24, and the outer wall of the first abutting arc block 25 and the inner wall of the fixed sleeve 24 are fixedly connected with a plurality of teeth, and the teeth are made of stainless steel, which has excellent durability due to the physical properties of the material. and strength. Under various harsh conditions of use, such as high temperature and high pressure, the metal teeth can maintain their shape and function, and also have good corrosion resistance, which extends the service life of the teeth. Since the second abutting curved block 27 and the first abutting curved block 25 are both curved, when the outer wall of the first abutting curved block 25 abuts the inner wall of the fixed sleeve 24, the curved outer wall can make the first abutting curved block 25 better fit with the inner wall of the fixed sleeve 24. A rubber pad is fixedly installed on the outer wall of the abutting wheel 19. Since the rubber pad is made of rubber material, it can enhance the friction between the abutting wheel 19 and the sleeve.

[0040] See also Figure 3 、11 As shown, one group of retractable arms 20 is fixedly connected to a fixing frame 41 at the bottom, a first drive motor 11 is fixedly installed on the upper end of the fixing frame 41, and a first pulley 17 is fixedly connected to the output end of the first drive motor 11. The inside of the retractable arm 20 is rotatably connected to a second pulley 39 through a rotating shaft, and the second pulley 39 is fixedly connected to the corresponding mounting disc 30. A transmission belt 40 is provided between the second pulley 39 and the first pulley 17. A number of weight-reducing holes are also provided on the outer walls of the second pulley 39 and the first pulley 17, which can help the staff reduce the weight during transportation and facilitate transportation.

[0041] The working principle of the present invention is: when in use, the sleeve is placed in the center of the inside of the counter-gear ring 8. At this time, it is only necessary to start the second drive motor 22, and the second drive motor 22 drives the transmission gear 23 to rotate, and the transmission gear 23 drives the spur gear ring 7 to rotate, and the spur gear ring 7 drives the counter-gear ring 8 to rotate on the inner wall of the fixed shell 15. When the counter-gear ring 8 rotates, it will drive the corresponding rack 13 and the moving bar 12 to move. When all the moving bars 12 move toward the direction of the sleeve, the moving bar 12 will drive the corresponding two groups of contraction arms 20 to move through the first fixed block 21. The two groups of contraction arms 20 will drive the contraction arms 20 to move in the direction of the sleeve, and the outer wall of the abutment wheel 19 will abut against the sleeve. Since there are two groups of limiting mechanisms 101, the limiting mechanism 101 can fix the two fixed points on the outer wall of the sleeve, so that when the sleeve is limited and fixed;

[0042] When the casing needs to be conveyed into the shaft and pressurized, the first drive motor 11 is started, and the first drive motor 11 drives the first pulley 17 to rotate. The first pulley 17 drives the second pulley 39 to rotate through the transmission belt 40. The second pulley 39 drives the fixed casing 24 to rotate through the abutment mechanism 201. The fixed casing 24 drives the abutment wheel 19 to rotate. Since the abutment wheel 19 abuts against the outer wall of the casing, the abutment wheel 19 drives the casing to be conveyed into the drilled shaft and pressurizes the casing.

[0043] When the abutment wheel 19 is damaged after long-term use, it is necessary to pull the abutment disc 32 so that the toothed disc 38 between the abutment disc 32 and the rotating round block 33 is disengaged, and then the rotating round block 33 is rotated. The rotating round block 33 moves in the direction of the mounting disc 30, and the rotating round block 33 drives the moving block 37 to move together with the first rotating arm 34. The first rotating arm 34 rotates under the action of the movement of the moving block 37. At this time, all the second abutment curved blocks 27 move closer and shrink in the direction of the moving block 37. When the first abutment curved block 25 is disengaged from the abutment with the inner wall of the fixed sleeve 24, it is only necessary to Pull the two sets of retractable arms 20 so that the retractable arms 20 drive the entire abutment mechanism 201 to detach from the interior of the fixed sleeve 24, and then the entire abutment wheel 19 can be taken out, and then the new abutment wheel 19 can be placed between the two sets of abutment mechanisms 201. According to the above working principle, it is only necessary to rotate the rotating block 33 in the opposite direction. When the first abutment curved block 25 abuts against the inner wall of the fixed sleeve 24, release the control of the abutment disk 32, and the toothed disk 38 between the abutment disk 32 and the rotating block 33 engages with each other to limit the rotating block 33, and the replacement of the new abutment wheel 19 can be completed.

[0044] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A petroleum casing pressurizing device, comprising a base (1), characterized in that: A first fixed plate (3) is provided above the base (1), and a plurality of freely retractable electric telescopic rods (2) are fixedly connected between the first fixed plate (3) and the base (1); a limiting mechanism (101) capable of limiting the position of the sleeve is fixedly installed on the upper ends of the base (1) and the first fixed plate (3); a plurality of abutting mechanisms (201) capable of abutting and moving the sleeve are rotatably installed inside the base (1) and the first fixed plate (3); an abutting wheel (19) is provided between each two groups of the abutting mechanisms (201); The outer wall of the abutment wheel (19) is fixedly connected with two groups of fixed sleeves (24), and each two groups of the abutment mechanisms (201) can be abutted and fixed on the inner wall of the corresponding fixed sleeve (24). When the limiting mechanism (101) moves, the abutment wheel (19) is driven by the abutment mechanism (201) to limit the sleeve. When one group of the abutment wheels (19) rotates, the sleeve can be pressurized and moved toward the inside of the shaft. Each group of the abutment mechanisms (201) includes a mounting disc (30), the mounting disc (30) being rotatably mounted on the outer wall of the corresponding retractable arm (20), the end of the mounting disc (30) away from the retractable arm (20) being fixedly connected to a threaded rod (29), and the end of the mounting disc (30) away from the retractable arm (20) being further fixedly connected to two groups of telescopic arms (31); An abutment disc (32) is fixedly connected between the two groups of telescopic arms (31), a second return spring (28) is fixedly connected between the abutment disc (32) and the mounting disc (30), a rotating circular block (33) is threadedly connected to the outer wall of the threaded rod (29), and a toothed disc (38) is fixedly connected to the end of the rotating circular block (33) opposite to the abutment disc (32), and the two groups of toothed discs (38) are adapted to each other, and the end of the rotating circular block (33) away from the toothed disc (38) is rotatably connected to the moving block (37); One end of the threaded rod (29) away from the mounting disc (30) is fixedly connected to a second fixed block (35), and the second fixed block (35) and the moving block (37) are in mutual abutment, the outer wall of the moving block (37) is rotatably connected to a plurality of first rotating arms (34), the outer wall of the second fixed block (35) is rotatably connected to a plurality of second rotating arms (36), and the outer wall of the second fixed block (35) is provided with a plurality of second abutting curved blocks (27), and one end of each group of the second abutting curved blocks (27) close to the second fixed block (35) is rotatably connected to the corresponding first rotating arm (34) and the second rotating arm (36); The bottom of one group of the retractable arms (20) is fixedly connected to a fixing frame (41), the upper end of the fixing frame (41) is fixedly mounted with a first drive motor (11), the output end of the first drive motor (11) is fixedly connected to a first pulley (17), the inside of the retractable arm (20) is rotatably connected to a second pulley (39), and the second pulley (39) is fixedly connected to a corresponding mounting disc (30), and a transmission belt (40) is provided between the second pulley (39) and the first pulley (17) through a tensioning sleeve.

2. The oil casing pressurizing device according to claim 1, characterized in that: The two groups of the limiting mechanisms (101) both include a third fixed disk (14), and the two groups of the third fixed disks (14) are fixedly mounted inside the first fixed disk (3) and the base (1), respectively; the upper ends of the third fixed disks (14) are fixedly connected to the second fixed disk (6); the bottoms of the second fixed disks (6) are fixedly connected to a fixed shell (15); and the inner wall of the fixed shell (15) is rotatably connected to a counter-gear ring (8).

3. The oil casing pressurizing device according to claim 2, characterized in that: The bottom of the counter-gear ring (8) is fixedly connected to a spur gear ring (7), and the upper end of the spur gear ring (7) is rotatably connected to the bottom of the fixed shell (15). The upper end of the third fixed disk (14) is fixedly mounted with a second drive motor (22), and the output end of the second drive motor (22) is fixedly connected with a transmission gear (23), and the transmission gear (23) and the spur gear ring (7) are meshed with each other. The inner wall of the third fixed disk (14) is fixedly mounted with a fixed chassis (9), and the upper end surface of the fixed chassis (9) is rotatably connected to a plurality of power gears (10), and each group of the power gears (10) is meshed with the counter-gear ring (8).

4. The oil casing pressurizing device according to claim 3, characterized in that: The upper end of the second fixed disk (6) is slidably connected to a plurality of moving bars (12), the outer wall of the moving bars (12) is fixedly connected to a rack (13), each set of the racks (13) is meshed with the corresponding power gear (10), and the opposite ends of the plurality of moving bars (12) are fixedly connected to a first fixed block (21), and the outer wall of the first fixed block (21) is fixedly connected to two sets of retractable arms (20) having a retracting function.

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