A packer device

Abstract

The application belongs to the technical field of cementing tools for oil well completion, and particularly provides a packer device, which comprises an upper joint, a cap, an outer sleeve, a closed expansion sleeve, a piston, an upper pressing cap, a central pipe, a locking mechanism, a lower pressing cap, a rubber cylinder seat, a rubber cylinder, a ball seat, a lower joint, an anti-sticking sleeve, a valve seat and a one-way mechanism; the problems of early seat hanging, unlocking difficulty, reverse non-sealing, complex structure and operation difficulty of the existing packer are solved; the closed expansion sleeve is adopted to prevent early expansion sealing, the locking mechanism adopts a locking ring self-locking to keep expansion sealing, the locking mechanism reverse nut is used to realize unlocking expansion sealing, the structure is simplified to realize one-time lifting, the device use reliability is improved, the one-way mechanism can realize reverse sealing, the structure is simple, and the operation is convenient.

Description

Technical Field

[0001] This invention belongs to the technical field of cementing tools for oil well completion, and specifically relates to a packer device. Background Technology

[0002] Existing packers of the same type adopt a seat-mounted sealing and lifting unlocking structure. When used in the field, they have problems such as premature seat-mounting, difficulty in unlocking, failure to seal in reverse, complex structure, and difficult operation. They cannot guarantee the normal use of the packer downhole, and may even cause subsequent drilling operations to be impossible. They have certain usage risks and cannot meet the requirements for cementing operations.

[0003] Chinese patent document CN217106934U, published on August 2, 2022, discloses a composite rubber sleeve packer and a horizontal well segmented water-finding tubing string including the packer. The packer includes a central tube and, sequentially, an upper protective sleeve, a rubber sleeve, a setting piston, and a lower protective sleeve, all fitted onto the outer wall of the central tube. A setting piston sleeve is fitted onto the outer wall of the central tube and connected to the lower protective sleeve. A first gap is formed between the rubber sleeve and the setting piston sleeve, allowing the setting piston to slide relative to the setting piston sleeve in a dynamic sealing manner. A hydraulic setting check valve is installed inside the upper protective sleeve, with its input end connected to an input through-hole and its output end connected to the first gap. When the setting piston slides upward relative to the setting piston sleeve, it compresses the lower end of the rubber sleeve. Its advantages include improved service life and reliability, simplified locking mechanism, and reduced manufacturing and usage costs; it also increases the success rate of horizontal well water-finding tubing recovery, improves water-finding efficiency, and reduces operating costs. However, this locking mechanism is a dissolvable locking mechanism, which has a long unlocking time, cannot be relocked after unlocking, has a complex structure, cannot be reused, and does not seal in reverse.

[0004] Chinese patent document CN202210875840.7, published on October 25, 2022, discloses a double-seal anti-tooth-retraction packer, solving the problems of easy failure of single seals and tooth retraction after pressure relief in traditional packers. It includes a central tube assembly, an upper sealing assembly, a lower sealing assembly, and an anchoring assembly. The upper sealing assembly, anchoring assembly, and lower sealing assembly are connected sequentially from top to bottom and are all connected to the central tube assembly. The upper sealing assembly cooperates with the lower sealing assembly to form a double-layer seal. The lower sealing assembly also drives the anchoring assembly to anchor and uses a single-flow inlet valve in the lower sealing assembly for one-way liquid locking to prevent tooth retraction. The central tube assembly provides oil passages to the upper and lower sealing assemblies and assists in unlocking during desealing. It is mainly used to ensure sealing during gas injection in oil fields. However, the sealing in this document also adopts a seat-hanging sealing and lifting unlocking structure. When used in the field, there are problems such as premature seat-hanging, difficulty in unlocking, failure to seal in reverse, complex structure, and difficult operation. It cannot guarantee the normal use of the packer downhole, and may even cause subsequent drilling operations to be impossible. It has certain usage risks and cannot meet the requirements for cementing operations. Summary of the Invention

[0005] The purpose of the packer device provided by this invention is to overcome the problems of pre-installation, difficulty in unlocking, failure to seal in reverse, complex structure, and difficult operation of packers in the prior art.

[0006] Therefore, the present invention provides a packer device, including an upper connector, a cap, an outer sleeve, a sealing expansion sleeve, a piston, an upper pressure cap, a central tube, a locking mechanism, a lower pressure cap, a rubber sleeve seat, a rubber sleeve, a ball seat, a lower connector, an anti-stick sleeve, a valve seat, and a one-way mechanism. The lower part of the upper connector is inner-sleeved to the upper end of the central tube, and the middle part of the upper connector is inner-sleeved to the sealing expansion sleeve. The lower outer part of the upper connector is sequentially sleeved with the piston and the upper part of the upper pressure cap from top to bottom. The upper outer part of the upper connector is sleeved with the cap, and the upper outer part of the upper connector and the piston are also connected. Both the upper and lower pressure caps are fitted with outer sleeves, with the upper part of the outer sleeves connected to the lower part of the cap. The bottom end of the upper pressure cap is connected to a locking mechanism, which is fitted onto the outside of the central tube. The lower end of the locking mechanism is fitted with a lower pressure cap, and the lower pressure cap is connected to a rubber tube. The rubber tube is fitted onto the outside of the central tube through a rubber tube seat. The bottom end of the central tube is connected to a ball seat. The lower end of the rubber tube seat is fitted onto the upper part of the lower connector, with the upper part of the lower connector connected to the lower part of the rubber tube. The outer side of the lower connector is fitted with an anti-stick sleeve, and the lower inner side of the lower connector is connected to a one-way mechanism.

[0007] Preferably, the lower outer side of the upper connector is recessed inward, and the upper part of the piston and the upper pressure cap are connected to the lower recess of the upper connector.

[0008] Preferably, the lower outer side of the piston protrudes downward.

[0009] Preferably, the upper inner side of the upper pressure cap protrudes upward, the lower end of the upper pressure cap protrudes outward, and the lower outer side of the upper pressure cap protrudes downward.

[0010] Preferably, the locking mechanism includes a locking sleeve, a reverse nut, a locking ring seat, a locking ring, and a locking ring limiting pin. The locking sleeve is sleeved outside the central tube and connected between the upper pressure cap and the lower pressure cap. The reverse nut and the locking ring seat are sequentially sleeved on the outside of the central tube inside the locking sleeve from top to bottom. The locking ring is connected to the locking ring seat. One end of the locking ring limiting pin is connected to the locking ring seat, and the other end of the locking ring limiting pin is locked to the locking ring.

[0011] Preferably, the one-way mechanism includes a rubber-coated valve, a spring, and a spring seat. The rubber-coated valve is connected to the spring seat via the spring, and the spring seat is connected to the lower inner side of the lower connector.

[0012] Preferably, the upper part of the adhesive-coated valve is hemispherical, with the lower part of the hemispherical shape bulging downwards from its center, and a spring is connected to the lower part of the bulge of the adhesive-coated valve.

[0013] Preferably, the anti-stick sleeve includes a side plate and a bottom plate, with a through hole at the center of the bottom plate, the side plate being cylindrical in shape, the bottom surface of the side plate being connected to the bottom plate, and the lower part of the spring seat being connected to the through hole.

[0014] Preferably, the packer device further includes a sealing expansion sleeve shear pin, a starting shear pin, and a ball seat shear pin. The upper connector is connected to the outer sleeve via the sealing expansion sleeve shear pin, and the lower pressure cap is connected to the locking sleeve via the starting shear pin.

[0015] Preferably, the packer device further includes an upper connector sealing ring, a closed expansion sleeve sealing ring, a piston sealing ring, a rubber sleeve seat sealing ring, a ball seat sealing ring, a lower connector sealing ring, and a valve seat sealing ring. The upper connector sealing ring is connected between the upper connector and the outer sleeve, the closed expansion sleeve sealing ring is connected between the closed expansion sleeve and the upper connector, the piston sealing ring is connected to the outside of the piston, the rubber sleeve seat sealing ring is connected between the rubber sleeve seat and the central tube, the ball seat sealing ring is connected between the ball seat and the central tube, the lower connector sealing ring is connected between the central tube and the lower connector, and the valve seat sealing ring is connected between the valve seat and the lower connector.

[0016] The beneficial effects of this invention are: 1. The packer device provided by this invention adopts a closed expansion sleeve. During the well insertion process, circulating fluid can be injected at any time for circulation. When the packer device is lowered to the designated position, a steel ball is thrown into the closed expansion sleeve to pressurize it and cause the shear pin of the closed expansion sleeve to break. The closed expansion sleeve expands and the steel ball moves down, ensuring that there is no risk of premature expansion during the insertion process. The expansion sleeve structure is simplified, the slip seat is eliminated, and the reliability of the tool is improved.

[0017] 2. The packer device provided by this invention includes a locking mechanism comprising a locking sleeve, a reverse nut, a locking ring seat, a locking ring, and a locking ring limiting pin. The locking sleeve is fitted over the central tube and connected between the upper and lower pressure caps. The reverse nut and the locking ring seat are sequentially fitted onto the outer side of the central tube inside the locking sleeve from top to bottom. The locking ring is connected to the locking ring seat. One end of the locking ring limiting pin is connected to the locking ring seat, and the other end is locked to the locking ring. When the steel ball falls to the ball seat position, pressure continues to build up, causing the piston to push the upper pressure cap, locking sleeve, and lower pressure cap downwards until the shearing pin is cut, thereby pushing the rubber sleeve to compress and expand for sealing. Pressurization continues until the ball seat shear pin cuts off and the ball seat falls off, re-establishing circulation. The locking sleeve continues to pressurize the rubber sleeve due to the locking ring restriction, achieving a seal. Then, cementing operations are performed. After the operation is completed, the undercut nut is unloaded by rotating the tubing string (upper connector and central tube) in the forward direction. The locking ring seat and locking ring move upward, and the rubber sleeve contracts, causing the locking sleeve to move upward, thus unlocking. The rubber sleeve contracts and resets, and can be pulled out of the wellbore along with the tubing, completing the entire cementing operation. This packer device allows for construction and extraction to be completed in a single well entry, simplifying the construction process. It has the advantages of stable structure, simple operation, and safety and reliability.

[0018] 3. The packer device provided by this invention includes a unidirectional mechanism comprising a rubber-coated valve, a spring, and a spring seat. The rubber-coated valve is connected to the spring seat via the spring, and the spring seat is connected to the lower inner side of the lower connector. The rubber-coated valve can seal the ball seat before pressure is applied or before the ball seat detaches. After pressure is applied and the ball seat detaches, the circulating fluid squeezes the rubber-coated valve, compressing the spring and establishing circulation. After the operation is completed, the spring's rebound force re-seals the ball seat, improving the device's sealing performance; it can seal in both forward and reverse directions. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Figure 1 This is a front view of the packer assembly structure; Figure 2 This is the structural diagram AA of the packer device; Figure 3 This is a diagram illustrating the ball being thrown after the packer device has been lowered into the designated position; Figure 4 This is a diagram illustrating the closed-loop upward pressure. Figure 5 This is a schematic diagram of the opening of the circulation hole in a closed expansion sleeve. Figure 6 This is a schematic diagram of the ball seat pressure expansion and sealing. Figure 7 This is a schematic diagram illustrating the cycle established after the ball seat detaches; Figure 8 This is a schematic diagram of the packer device being unsealed; Figure 9 This is a structural diagram of the lock ring seat; Figure 10 This is a top view of the structure of the inverted nut; Figure 11 This is a structural diagram of the undercut nut AA; Figure 12 This is a diagram of the rubber sleeve structure; Figure 13 This is a structural diagram of the pressure cap; Figure 14 This is a structural diagram of the cap; Figure 15 This is a bottom view of the spring seat structure; Figure 16 This is the main structural view of the retaining pin; Figure 17 This is the main structural view of the glued valve; Figure 18 This is the main structural view of the spring; Figure 19 This is the main structural view of the piston; Figure 20 This is the main structural view of the upper connector; Figure 21 This is the main structural view of the upper connector AA; Figure 22 This is the main structural view of the upper pressure cap; Figure 23 This is the main structural view of the locking ring; Figure 24 This is a top view of the lock ring structure; Figure 25 This is the main structural view of the rubber sleeve holder; Figure 26 This is a structural diagram of the rubber sleeve holder AA; Figure 27 This is the main structural view of the lock sleeve; Figure 28 This is a bottom view of the lock sleeve structure; Figure 29 This is the main structural view of the outer garment; Figure 30 This is the main structural view of the lower connector; Figure 31 This is a top view of the closed expansion sleeve structure; Figure 32 This is the main view of the closed expansion sleeve structure; Figure 33 This is the main structural view of the anti-stick sleeve; Figure 34 This is the main structural view of the steel ball; Figure 35 This is the main structural view of the ball seat; Figure 36 This is the main structural view of the valve seat; Figure 37This is the main structural view of the central tube.

[0021] Explanation of reference numerals in the attached diagram: 1. Upper connector; 2. Connecting cap; 3. Outer sleeve; 4. Upper connector sealing ring; 5. Sealing expansion sleeve shear pin; 6. Sealing expansion sleeve; 7. Sealing expansion sleeve sealing ring; 8. Piston sealing ring; 9. Piston; 10. Upper pressure cap; 11. Center tube; 12. Locking sleeve; 13. Backed nut; 14. Locking ring seat; 15. Locking ring; 16. Locking ring limiting pin; 17. Lower pressure cap; 18. Starting shear pin; 19. 20. Glue sleeve seat; 21. Glue sleeve seat sealing ring; 22. Glue sleeve; 23. Ball seat; 24. Ball seat sealing ring; 25. Ball seat shear pin; 26. Lower connector; 27. Lower connector sealing ring; 28. Stop pin; 28. Anti-stick sleeve; 28-1. Side plate; 28-2. Base plate; 28-3. Through hole; 29. ​​Valve seat; 30. Valve seat sealing ring; 31. Glue-coated valve; 32. Spring; 33. Spring seat; 34. Steel ball. Detailed Implementation

[0022] Example 1: like Figures 1-8 , Figures 12-14 , Figures 19-22 , Figure 25 , Figure 26 , Figures 29-37 As shown, a packer device includes an upper connector 1, a cap 2, an outer sleeve 3, a sealing expansion sleeve 6, a piston 9, an upper pressure cap 10, a central tube 11, a locking mechanism, a lower pressure cap 17, a rubber sleeve seat 19, a rubber sleeve 21, a ball seat 22, a lower connector 25, an anti-stick sleeve 28, a valve seat 29, and a one-way mechanism. The lower part of the upper connector 1 is inner-sleeved to the upper end of the central tube 11, and the middle part of the upper connector 1 is inner-sleeved to the sealing expansion sleeve 6. The lower outer part of the upper connector 1 is sequentially sleeved from top to bottom to the upper part of the piston 9 and the upper part of the upper pressure cap 10. The upper outer part of the upper connector 1 is sleeved to the cap 2. The upper outer part of the upper connector 1, the outer part of the piston 9, and the upper pressure cap 17 are all connected together. The outer side of 0 is fitted with an outer sleeve 3, and the upper part of the outer sleeve 3 is connected to the lower part of the cap 2. The bottom end of the upper pressure cap 10 is connected to the locking mechanism, and the locking mechanism is fitted on the outer side of the central tube 11. The lower end of the locking mechanism is fitted with a lower pressure cap 17. The lower pressure cap 17 is connected to the rubber tube 21. The rubber tube 21 is fitted on the outer side of the central tube 11 through the rubber tube seat 19. The bottom end of the central tube 11 is connected to the ball seat 22. The lower end of the rubber tube seat 19 is fitted on the upper part of the lower connector 25, and the upper part of the lower connector 25 is connected to the lower part of the rubber tube 21. The outer side of the lower connector 25 is fitted with an anti-stick sleeve 28. The lower inner side of the lower connector 25 is connected to a one-way mechanism.

[0023] The packer device provided by this invention uses a closed expansion sleeve 6, which can be circulated by injecting circulating fluid at any time during the well insertion process. When the packer device is lowered to the designated position, a steel ball 34 is thrown into the closed expansion sleeve 6 to pressurize it and cut the shear pin 5 of the closed expansion sleeve. The closed expansion sleeve 6 expands open, and the steel ball 34 moves down, ensuring that there is no risk of premature expansion during the insertion process. The expansion sleeve structure is simplified, the slip seat is eliminated, and the reliability of the tool is improved.

[0024] Preferably, the lower outer side of the upper connector 1 is recessed inward, and the upper parts of the piston 9 and the upper pressure cap 10 are connected to the lower recess of the upper connector 1.

[0025] The lower outer side of the upper connector 1 is recessed inward, which serves two purposes: firstly, it facilitates the connection so that the closed expansion sleeve 6 can be connected to the outer sleeve 3 through the upper connector 1; secondly, it facilitates the expansion sleeve 6 to expand, and after the steel ball 34 moves down, the circulating fluid enters the space above the piston 9, thereby causing the circulating fluid to squeeze the piston 9 down.

[0026] Preferably, the lower outer side of the piston 9 protrudes downward.

[0027] This configuration increases the contact area between the piston 9 and the upper pressure cap 10, making it easier for the piston 9 to drive the upper pressure cap 10 downwards and preventing the upper pressure cap 10 from moving outwards.

[0028] Preferably, the upper inner side of the upper pressure cap 10 protrudes upward, the lower end of the upper pressure cap 10 protrudes outward, and the lower outer side of the upper pressure cap 10 protrudes downward.

[0029] The upper protrusion of the upper pressure cap 10 connects the upper end of the upper pressure cap 10 between the upper connector 1 and the piston 9, preventing the upper pressure cap 10 from moving outward when it moves down. The lower protrusion of the upper pressure cap 10 facilitates the upper pressure cap 10 to push the locking mechanism down and prevents the locking mechanism from moving outward when it moves down.

[0030] Example 2: Based on Example 1, such as Figures 9-11 , Figure 23 , Figure 24 , Figure 27 , Figure 28 As shown, the locking mechanism includes a locking sleeve 12, a reverse nut 13, a locking ring seat 14, a locking ring 15, and a locking ring limiting pin 16. The locking sleeve 12 is sleeved on the outside of the central tube 11 and is connected between the upper pressure cap 10 and the lower pressure cap 17. The reverse nut 13 and the locking ring seat 14 are sequentially sleeved on the outside of the central tube 11 inside the locking sleeve 12 from top to bottom. The locking ring 15 is connected to the locking ring seat 14. One end of the locking ring limiting pin 16 is connected to the locking ring seat 14, and the other end of the locking ring limiting pin 16 is locked to the locking ring 15.

[0031] The locking ring limiting pin 16 prevents the locking ring 15 from rotating. When the steel ball falls to the ball seat 22, it continues to pressurize, causing the piston 9 to push the upper pressure cap 10, locking sleeve 12, and lower pressure cap 17 downward until the shearing pin 18 is cut off. This then pushes the rubber sleeve 21 to compress and expand, and pressurization continues until the ball seat shearing pin 24 cuts off the ball seat 22 and the circulation is re-established. The locking sleeve 12 continues to pressurize the rubber sleeve 21 to achieve a seal due to the restriction of the locking ring 15. Then, the cementing operation is carried out. After the operation is completed, the reverse nut 13 is unloaded by rotating the pipe string in the forward direction (upper connector 1 and central pipe 11). The locking ring seat 14 and locking ring 15 move upward, and the rubber sleeve 21 contracts, causing the locking sleeve 12 to move upward to achieve unlocking. The rubber sleeve 21 contracts and resets, and can be pulled out of the wellbore along with the tubing. The entire cementing operation is completed. This packer device can complete the construction and extraction in one trip into the well, simplifying the construction process. It has the advantages of stable structure, simple operation, and safety and reliability.

[0032] Preferably, the outer side of the upper half of the central tube 11 is stepped, with the outer diameter of the stepped shape increasing from top to bottom; this setting can limit the locking of the undercut nut 13 and the locking ring seat 14 when locked, and facilitates the unfastening of the undercut nut 13 and the upward movement of the locking ring seat 14 when unlocked.

[0033] Preferably, the locking ring seat 14 is cylindrical, with both the upper and lower ends of the cylinder protruding outwards, and the outer diameter of the protrusion at the upper end of the cylinder decreasing sequentially from top to bottom; this arrangement facilitates the locking ring 15 to be connected inside the locking ring seat 14, and also facilitates the locking sleeve 12 to engage with the lowering locking ring seat 14 and move downwards.

[0034] Preferably, the number of protrusions on the locking ring seat 14 is set according to actual conditions, and the protrusions of multiple locking ring seats 14 are circumferentially evenly spaced; the locking sleeve 12 has a longitudinally formed slot, and the slot engages with the protrusions of the locking ring seat 14; in actual use, there are multiple slots, and the multiple slots are circumferentially evenly spaced. The structure is simple and the connection is convenient.

[0035] Preferably, the packer device further includes a stop pin 27, which is connected to the rubber sleeve seat 19 below the ball seat 22; the stop pin 27 is used to prevent the ball seat 22 from falling off without affecting the establishment of the cycle.

[0036] Example 3: Based on Example 2, such as Figures 15-18 As shown, the one-way mechanism includes a rubber-coated valve 31, a spring 32, and a spring seat 33. The rubber-coated valve 31 is connected to the spring seat 33 via the spring 32. The spring seat 33 is connected to the lower inner side of the lower connector 25.

[0037] Before the pressure build-up operation or before the ball seat 22 falls off, the rubber-coated valve 31 can seal the ball seat 22. After the pressure build-up operation, after the ball seat 22 falls off, the circulating fluid squeezes the rubber-coated valve 31 to compress the spring 32, thereby establishing circulation. After the operation is completed, the rebound force of the spring 32 is used to make the rubber-coated valve 31 reseal the ball seat 22, thus improving the sealing performance of the device. It can seal in both forward and reverse directions.

[0038] Preferably, the upper part of the adhesive-coated valve 31 is hemispherical, and the lower part of the hemispherical shape has a downward convex center. The lower part of the convex part of the adhesive-coated valve 31 is connected to the spring 32.

[0039] The hemispherical rubber-coated valve 31 increases the contact area with the circulating fluid and provides a good seal with the ball seat 22.

[0040] Preferably, the anti-stick sleeve 28 includes a side plate 28-1 and a bottom plate 28-2. A through hole 28-3 is opened at the center of the bottom plate 28-2. The side plate 28-1 is cylindrical in shape. The bottom surface of the side plate 28-1 is connected to the bottom plate 28-2. The lower part of the spring seat 33 is connected to the through hole 28-3.

[0041] The anti-stick sleeve 28 of this structure improves the stability of the unidirectional mechanism connection while making the structure aesthetically pleasing.

[0042] Preferably, the packer device further includes a sealing expansion sleeve shear 5, a starting shear 18, and a ball seat shear 24. The upper connector 1 is connected to the outer sleeve 3 through the sealing expansion sleeve shear 5, and the lower pressure cap 17 is connected to the locking sleeve 12 through the starting shear 18.

[0043] The closed expansion sleeve shear pin 5, the starting shear pin 18, and the ball seat shear pin 24 can satisfy both the fixing requirements when locking and the movement requirements of the fixed parts when unlocking.

[0044] Preferably, the packer device further includes an upper connector sealing ring 4, a closed expansion sleeve sealing ring 7, a piston sealing ring 8, a rubber sleeve seat sealing ring 20, a ball seat sealing ring 23, a lower connector sealing ring 26, and a valve seat sealing ring 30. The upper connector sealing ring 4 is connected between the upper connector 1 and the outer sleeve 3. The closed expansion sleeve sealing ring 7 is connected between the closed expansion sleeve 6 and the upper connector 1. The piston sealing ring 8 is connected to the outside of the piston 9. The rubber sleeve seat sealing ring 20 is connected between the rubber sleeve seat 19 and the central tube 11. The ball seat sealing ring 23 is connected between the ball seat 22 and the central tube 11. The lower connector sealing ring 26 is connected between the central tube 11 and the lower connector 25. The valve seat sealing ring 30 is connected between the valve seat 29 and the lower connector 25.

[0045] This feature improves the overall sealing of the packer assembly, prevents liquid leakage, and facilitates pressure build-up.

[0046] The assembly relationship of the packer device of the present invention is as follows: First, install the sealing ring 7 of the sealing expansion sleeve into the corresponding sealing groove of the sealing expansion sleeve 6. Then, install the sealing expansion sleeve 6 into the corresponding annular groove of the upper connector 1. Next, insert the shear pin 5 of the sealing expansion sleeve into the corresponding threaded hole of the upper connector 1 and tighten it. Then, install the sealing ring 4 of the upper connector into the corresponding sealing groove of the upper connector 1. Next, install the piston sealing ring 8 into the corresponding sealing groove of the piston 9. Then, connect the piston 9 to the upper pressure cap 10 and tighten it. Then, install the upper pressure cap 10 into the corresponding position of the upper connector 1. Next, install the outer sleeve 3 into the corresponding position of the upper connector 1. Finally, install the inner cap 2. Insert the upper connector 1 into the corresponding thread and tighten it. Then, insert the locking sleeve 12 into the corresponding thread of the upper pressure cap 10 and tighten it. Next, put the locking ring 15 into the locking ring seat 14. Then, insert the locking ring limiting pin 16 into the corresponding position of the locking ring seat 14 and tighten it. Next, insert the locking ring seat 14 into the corresponding position of the center tube 11. Then, insert the undercut thread 13 into the corresponding thread of the center tube 11 and tighten it. Next, insert the rubber sleeve seat sealing ring 20 into the corresponding sealing groove of the center tube 11. Then, insert the ball seat sealing ring 23 into the corresponding sealing groove of the ball seat 22. Then, put the ball... Insert seat 22 into the corresponding position of center tube 11, then insert ball seat shear pin 24 into the corresponding position of center tube 11 and tighten. Next, insert center tube 11 into the corresponding thread of upper connector 1 and tighten. Then, insert rubber sleeve seat 19 into the corresponding thread of center tube 11 and tighten. Next, insert lower pressure cap 17 into the corresponding thread of locking sleeve 12 and tighten. Then, insert starting shear pin 18 into the corresponding thread of lower pressure cap 17 and tighten. Next, insert valve seat sealing ring 30 into the corresponding sealing groove of valve seat 29. Then, insert valve seat 29 into lower connector 25. Finally, attach the adhesive-coated sleeve... Install valve 31 into lower connector 25, then fit spring 32 into the corresponding position of adhesive valve 31, then install spring seat 33 into the corresponding thread of lower connector 25 and tighten it, then install anti-stick sleeve 28 into the corresponding thread of lower connector 25 and tighten it, then install lower connector sealing ring 26 into the corresponding sealing groove of lower connector 25, then install rubber tube 21 into the corresponding position of rubber tube seat 19, then install stop pin 27 into the corresponding hole of rubber tube seat 19, and finally install lower connector 25 into the corresponding thread of rubber tube seat 19 and tighten it. The assembly is now complete.

[0047] The working principle of the packer device of the present invention is as follows: In use, the packer device of this invention is lowered into the wellbore of the corresponding specification by connecting it to the oil pipe. During the well entry process, circulating fluid can be injected at any time to circulate. When the device is lowered to the designated position, the ball is thrown to pressurize and seal the expansion sleeve. The shearing pin cuts and moves downward to open the circulation hole. At the same time as the steel ball falls to the ball seat 22 position, the pressure continues to be pressed, causing the piston 9 to push the upper pressure cap 10, the locking sleeve 12, and the lower pressure cap 17 downward until the shearing pin 18 is cut, which in turn pushes the rubber sleeve 21 to compress and seal. The pressure continues to be increased until the ball seat shearing pin 24 cuts and the ball seat 22 falls off. After the ball seat 22 falls off, the circulating fluid squeezes the rubber valve 31 to compress the spring 32 and re-establishes circulation (the liquid passes through the upper connector 1). The contents of the inner tube, the inner tube 11, the space between the inner tube 11 and the upper part of the ball seat 22, the inner tube, the space between the ball seat 22 and the rubber-coated valve 31, the space between the spring 32 and the spring seat 33 flow out. The locking sleeve 12 continues to press the rubber sleeve 21 to achieve a seal due to the restriction of the locking ring 15, and then the cementing operation is carried out. After the operation is completed, the reverse nut 13 is unloaded by rotating the pipe string in the forward direction (upper connector 1 and central tube 11), the locking ring seat 14 and the locking ring 15 move upward, the rubber sleeve 21 contracts and causes the locking sleeve 12 to move upward to achieve unlocking. The rebound force of the spring 32 is used to make the rubber-coated valve 31 reseal the ball seat 22. The rubber sleeve 21 contracts and resets and can be pulled out of the wellbore along with the tubing. The entire cementing operation is completed.

[0048] In the description of this invention, it should be understood that if terms such as "upper," "inner," or "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the invention.

[0049] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A packer device, characterized in that: The components include an upper connector (1), a cap (2), an outer sleeve (3), a closed expansion sleeve (6), a piston (9), an upper pressure cap (10), a central tube (11), a locking mechanism, a lower pressure cap (17), a rubber sleeve seat (19), a rubber sleeve (21), a ball seat (22), a lower connector (25), an anti-stick sleeve (28), a valve seat (29), and a one-way mechanism. The lower part of the upper connector (1) is inner-fitted to the upper end of the central tube (11), and the middle part of the upper connector (1) is inner-fitted to the closed expansion sleeve (6). The lower outer part of the upper connector (1) is fitted with the upper part of the piston (9) and the upper part of the upper pressure cap (10) from top to bottom. The upper outer part of the upper connector (1) is fitted with the cap (2), and the outer sleeve (3) is fitted on the upper outer part of the upper connector (1) and the outer part of the piston (9). The upper end of the upper pressure cap (10) is connected to the lower end of the outer sleeve (3), and the lower end of the cap (2) is connected to the lower end of the upper pressure cap (10). The bottom end of the upper pressure cap (10) is connected to the locking mechanism and the locking mechanism is sleeved on the outside of the central tube (11). The lower end of the locking mechanism is sleeved on the outer side of the lower pressure cap (17). The lower end of the lower pressure cap (17) is connected to the rubber tube (21). The rubber tube (21) is sleeved on the outside of the central tube (11) through the rubber tube seat (19). The bottom end of the central tube (11) is connected to the ball seat (22). The lower end of the rubber tube seat (19) is sleeved on the upper part of the lower connector (25) and the upper end of the lower connector (25) is connected to the lower end of the rubber tube (21). The outer side of the lower connector (25) is sleeved with the anti-stick sleeve (28). The lower inner side of the lower connector (25) is connected to the one-way machine. The locking mechanism includes a locking sleeve (12), a reverse nut (13), a locking ring seat (14), a locking ring (15), and a locking ring limiting pin (16). The locking sleeve (12) is fitted over the center tube (11) and is connected between the upper pressure cap (10) and the lower pressure cap (17). The reverse nut (13) and the locking ring seat (14) are fitted over the center tube (11) from top to bottom inside the locking sleeve (12). The locking ring seat (14) is connected to the locking ring (15). One end of the locking ring limiting pin (16) is connected to the locking ring seat (14), and the other end of the locking ring limiting pin (16) is locked to the locking ring (15). The one-way mechanism includes a rubber-coated valve (31), a spring (32), and a spring seat (33). The rubber-coated valve (31) The spring seat (33) is connected to the lower part of the lower connector (25) via the spring (32); the anti-stick sleeve (28) includes a side plate (28-1) and a bottom plate (28-2), with a through hole (28-3) at the center of the bottom plate (28-2), the side plate (28-1) being cylindrical in shape, the bottom surface of the side plate (28-1) being connected to the bottom plate (28-2), and the lower part of the spring seat (33) being connected to the through hole (28-3); the packer device also includes a sealing expansion sleeve shear pin (5), a starting shear pin (18), and a ball seat shear pin (24), the upper connector (1) being connected to the outer sleeve (3) via the sealing expansion sleeve shear pin (5), and the lower pressure cap (17) being connected to the locking sleeve (12) via the starting shear pin (18).

2. The packer device as claimed in claim 1, characterized in that: The lower outer side of the upper connector (1) is recessed inward, and the upper part of the piston (9) and the upper pressure cap (10) are connected to the recess in the lower part of the upper connector (1).

3. The packer device as claimed in claim 1, characterized in that: The piston (9) has a downward convex outer side.

4. The packer device as claimed in claim 1, characterized in that: The upper inner side of the upper pressure cap (10) protrudes upward, the lower end of the upper pressure cap (10) protrudes outward, and the lower outer side of the upper pressure cap (10) protrudes downward.

5. The packer device as claimed in claim 1, characterized in that: The upper part of the glued valve (31) is hemispherical, and the bottom of the hemispherical part protrudes downward. The lower part of the protrusion of the glued valve (31) is connected to the spring (32).

6. The packer device as claimed in claim 1, characterized in that: The packer device also includes an upper connector sealing ring (4), a closed expansion sleeve sealing ring (7), a piston sealing ring (8), a rubber sleeve seat sealing ring (20), a ball seat sealing ring (23), a lower connector sealing ring (26), and a valve seat sealing ring (30). The upper connector sealing ring (4) is connected between the upper connector (1) and the outer sleeve (3). The closed expansion sleeve sealing ring (7) is connected between the closed expansion sleeve (6) and the upper connector (1). The piston sealing ring (8) is connected to the outside of the piston (9). The rubber sleeve seat sealing ring (20) is connected between the rubber sleeve seat (19) and the central tube (11). The ball seat sealing ring (23) is connected between the ball seat (22) and the central tube (11). The lower connector sealing ring (26) is connected between the central tube (11) and the lower connector (25). The valve seat sealing ring (30) is connected between the valve seat (29) and the lower connector (25).

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