A cone pressure two-stage setting packer

Abstract

This application provides a two-stage cone-pressure setting packer, relating to the field of packers. It includes a central tube, a hydraulic cylinder, a thrust assembly, a one-way motion locking ring, a cone-insertion assembly, a rubber sleeve assembly, and a slip assembly. The thrust assembly is fixedly connected to the central tube via a first shear screw. The hydraulic cylinder drives the thrust assembly to slide on the central tube, causing the first shear screw to be sheared, which in turn sequentially pushes the one-way motion locking ring, the cone-insertion assembly, the rubber sleeve assembly, and the slip assembly, causing the slip assembly to engage with the inner wall of the sleeve. After the slip assembly engages with the inner wall of the sleeve, the piston of the hydraulic cylinder continues to generate axial driving force, driving the thrust assembly to sequentially push the one-way motion locking ring, the cone-insertion assembly, and the rubber sleeve assembly along the axial direction of the central tube, causing the rubber sleeve assembly to be fully compressed and achieving setting. Throughout the entire driving process of the piston in the hydraulic cylinder, the cone at one end of the cone-insertion assembly can cone between the rubber sleeve assembly and the central tube, forcing the rubber sleeve assembly to expand radially. This application has the effect of preventing obstruction during the packer's lowering process.

Description

Technical Field

[0001] This application relates to the field of packer technology, and more particularly to a cone-pressed two-stage setting packer. Background Technology

[0002] Packers are key tools in petroleum engineering used to isolate different sections of the wellbore and control fluid flow. Their core function is to seal the annular space between the tubing and casing, preventing fluid cross-contamination and enabling operations such as stratified extraction, water injection, and testing. The sealing of a packer is primarily achieved through a rubber sleeve. However, when using packers in casing, slips are typically used to secure the packer and improve its stability.

[0003] Chinese patent CN2205391U, published in the relevant technology, proposes a packer for oil and gas wells, which includes a central tube with an upper connector at the upper end. A lower slip assembly is installed on the outer wall of the central tube to anchor the packer to the inner wall of the casing from the lower part of the central tube during the first setting stage. An upper slip assembly is installed on the upper end of the central tube to anchor the packer to the inner wall of the casing from the upper part of the central tube during the second setting stage. An upper cone that mates with the upper slip assembly, a lower cone that mates with the lower slip assembly, and a rubber sleeve assembly that seals the casing in the third setting stage are installed on the outer wall of the central tube between the upper slip assembly and the lower slip assembly. A setting assembly is installed on the outer wall of the central tube between the rubber sleeve assembly and the lower cone assembly.

[0004] Chinese patent CN204186342U, published in the relevant technology section, proposes a sleeve hydraulic packer, which includes inner and outer central tubes, a combined sealing rubber sleeve, a setting piston, and a slip assembly fitted onto the outer central tube. The front end of the inner central tube is screwed to an upper connector, and the rear end is pinned to the outer central tube. The setting piston includes upper and lower pistons screwed together, each covered by a cylinder liner. The lower piston is pinned to the cylinder liner, which is connected to the upper connector via a locking ring. A pressure transmission hole is provided between the upper connector and the cylinder liner. A slip is fixed to the rear end of the outer central tube. A rubber sleeve mandrel is fitted onto the outer central tube between the slip and the cylinder liner. The combined sealing rubber sleeve is fitted onto the rubber sleeve mandrel. The front end of the rubber sleeve mandrel is screwed to the lower piston, and the rear end is fixedly connected to a cone. The tip of the cone is inserted into the slip.

[0005] Regarding the aforementioned technologies, packers with the above-mentioned structures generally suffer from high running resistance and poor descent during the process of being lowered into the wellbore along the casing. They are prone to jamming midway, which affects the smooth lowering of the packer to the predetermined well depth, reducing operational efficiency and construction safety. Summary of the Invention

[0006] In order to overcome the technical problems described in the prior art, this application provides a cone-pressed two-stage setting packer.

[0007] The technical solution of the cone-pressure two-stage setting packer provided in this application is as follows: A cone-press two-stage setting packer includes a central tube and a hydraulic cylinder, a thrust assembly, a one-way motion locking ring, a cone insertion assembly, a rubber sleeve assembly, and a slip assembly sequentially sleeved on the central tube. The thrust assembly is fixedly connected to the central tube by a first shear screw. The piston of the hydraulic cylinder can generate an axial driving force, causing the thrust assembly to slide on the central tube, so that the first shear screw is sheared. Then, the piston of the hydraulic cylinder can drive the thrust assembly to push the one-way motion locking ring, the cone insertion assembly, the rubber sleeve assembly and the slip assembly in sequence along the central tube axis, so that the slip assembly is inserted into the inner wall of the sleeve. After the slip assembly enters the inner wall of the sleeve, the piston of the hydraulic cylinder continues to generate axial driving force, driving the thrust assembly to push the one-way motion locking ring, the conical insertion assembly and the rubber sleeve assembly in sequence along the central tube axis, so that the rubber sleeve assembly is fully compressed to achieve setting and sealing, and the setting state is locked by the one-way motion locking ring. During the entire driving process of the piston in the hydraulic cylinder, the cone at one end of the conical assembly can be inserted between the rubber sleeve assembly and the central tube, forcing the rubber sleeve assembly to expand radially.

[0008] Furthermore, the rubber sleeve assembly includes a sealed long rubber sleeve and multiple metal rings. The sealed long rubber sleeve is sleeved on the central tube, and the multiple metal rings are evenly distributed on the inner wall of the sealed long rubber sleeve along the axial direction of the central tube, and the multiple metal rings are arranged around the central tube.

[0009] Furthermore, the metal ring has a triangular cross-section, with one of the sharp corners of the triangle facing away from the central tube.

[0010] Furthermore, the rubber sleeve assembly also includes a protective rubber sleeve and a shoulder for axially and radially limiting the end of the sealing long rubber sleeve. The protective rubber sleeve and the shoulder are respectively disposed at both ends of the sealing long rubber sleeve, and both the protective rubber sleeve and the shoulder are sleeved on the central tube.

[0011] Furthermore, the cone-shaped assembly includes a cone and a plastic ring arranged coaxially. The plastic ring is arranged around the outside of the cone, the cone is sleeved on the central tube, and one end of the cone is fixedly connected to one end of the thrust assembly.

[0012] Furthermore, the thrust assembly includes a thrust sleeve, which is fitted onto the central tube. One end of the thrust sleeve contacts the piston of the hydraulic cylinder, and the other end is threaded onto the end of the cone.

[0013] Furthermore, the one-way motion locking ring is unidirectionally slidably sleeved on the central tube, the cone is covered on the outside of the one-way motion locking ring, and the one-way motion locking ring is locked between the cone and the thrust sleeve.

[0014] Furthermore, an inner cavity is formed on the inner wall of the thrust sleeve, and a drain hole communicating with the inner cavity is also formed on the thrust sleeve. The inner cavity and the drain hole allow the liquid entering between the thrust sleeve and the central tube to be discharged.

[0015] Furthermore, a setting block is also fitted onto the central tube, and the setting block is located between the sealing elongated rubber tube and the slip assembly.

[0016] Furthermore, the seat block is temporarily fixed to the central tube by a second shear screw.

[0017] In summary, this application includes the following beneficial technical effects: The packer of the present invention is inserted between the rubber sleeve assembly and the central tube by the conical insertion component, which causes the rubber sleeve assembly to expand radially. While ensuring that the rubber sleeve has good sealing performance, the outer diameter of the rubber sleeve can be made smaller, thereby making the overall outer diameter of the packer smaller and avoiding obstruction during the insertion process of the packer. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0020] Figure 2 This is an exploded view of the overall structure in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of a cone-pressed two-stage setting packer during initial sealing in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of a cone-pressed two-stage setting packer during secondary setting in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the hydraulic cylinder, sealing ring, piston, thrust sleeve and central tube in the embodiments of this application.

[0024] Figure 6 This is a schematic diagram of the structure of the thrust sleeve, central tube, first shear screw, one-way motion locking ring, and cone in the embodiments of this application.

[0025] Figure 7 This is a schematic diagram of the structure of the central tube, sealing rubber cylinder, metal ring, shoulder, sandproof ring, setting block, and slip cone in the embodiments of this application.

[0026] Figure 8 This is a schematic diagram of the structure of the central tube, the slip cone, the segmented slip, the spring ring, and the supporting outer cylinder in the embodiments of this application.

[0027] Figure 9 This is a cross-sectional structural diagram of the protective rubber tube, sealing long rubber tube, metal ring, and shoulder guard in the embodiments of this application.

[0028] Reference numerals: 1. Lower connector; 2. Centralizing block; 3. Hydraulic cylinder; 4. Sealing ring; 5. Piston; 6. Thrust sleeve; 7. Central tube; 8. First shearing screw; 9. One-way motion locking ring; 10. Cone; 11. Plastic ring; 12. Protective rubber sleeve; 13. Sealing long rubber sleeve; 14. Metal ring; 15. Shoulder guard; 16. Sandproof ring; 17. Sealing stop block; 18. Slip cone; 19. Split slip; 20. Spring ring; 21. Bearing outer cylinder; 22. Upper connector; 23. Liquid inlet; 24. Second shearing screw; 25. Convex ring; 26. Groove; 27. Locking structure; 28. Abutment groove; 29. ​​Inner cavity; 30. Drain hole; 31. Sleeve; 32. Cavity. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] This application discloses a cone-pressed two-stage setting packer. (Refer to...) Figure 1 , Figure 2 and Figure 5A conical two-stage setting packer includes a central tube 7 and a lower connector 1, a centralizing block 2, a hydraulic cylinder 3, a thrust assembly, a one-way motion locking ring 9, a conical insertion assembly, a rubber sleeve assembly, a slip assembly, and an upper connector 22, which are sequentially sleeved on the central tube 7. The centralizing block 2 is threaded onto the lower connector 1, and the lower connector 1 is threaded onto the bottom end of the central tube 7, so that the centralizing block 2 can be stably installed at the end of the central tube 7 under the connection action of the lower connector 1. The hydraulic cylinder 3 is slidably sleeved on the central tube 7, with its cylinder body in contact with the centralizing block 2 and its piston 5 in contact with the end of the thrust assembly. Sealing rings 4 are provided at the connection between the cylinder body and the piston 5 and between the piston 5 and the central tube 7 for sealing treatment. A liquid inlet hole 23 is provided through the side wall of the central tube 7. A cavity 32 communicating with the liquid inlet hole 23 is provided between the liquid cylinder 3 and the central tube 7. After the packer is lowered into the target layer with the tubing, the high-pressure liquid enters the cavity 32 through the central tube 7 and the liquid inlet hole 23 by pressure buildup. The high-pressure liquid compresses the end of the piston 5, thereby pushing the piston 5 to slide away from the cylinder, and thus applying thrust to the thrust assembly.

[0031] Reference Figure 1 , Figure 2 and Figure 5 The thrust assembly includes a thrust sleeve 6, which is fitted onto the central tube 7 and temporarily fixed to the central tube 7 by a first shear screw 8. One end of the thrust sleeve 6 contacts the piston 5, and the other end is fixedly connected to the end of the conical assembly. To reduce the resistance of the thrust sleeve 6 during sliding, an inner cavity 29 is formed on the inner wall of the thrust sleeve 6, and a drain hole 30 communicating with the inner cavity 29 is formed through the side wall of the thrust sleeve 6. The drain hole 30 allows the liquid entering between the thrust sleeve 6 and the central tube 7 to be discharged, thereby reducing the sliding resistance of the thrust sleeve 6 during setting.

[0032] Reference Figure 1 , Figure 2 , Figure 6 The conical assembly includes a cone 10 that slides and is sleeved on the central tube 7 and a plastic ring 11 that is sleeved on the cone 10. The cone 10 and the central tube 7 are clearance-fitted, and the plastic ring 11 and the cone 10 are interference-fitted. The inner cavity 29 of the thrust sleeve 6 is stepped. One end of the cone 10 is threaded into the thrust sleeve 6 and abuts against the stepped surface of the stepped hole. A convex ring 25 is provided on the outer periphery of the cone 10 for the end of the thrust sleeve 6 to abut against. The plastic ring 11 is located on the side of the convex ring 25 away from the thrust sleeve 6.

[0033] Reference Figure 1 , Figure 2 , Figure 6A one-way motion locking ring 9 is unidirectionally slidably fitted onto the central tube 7. A groove 26 is formed on the inner wall of the cone 10 near the thrust sleeve 6. The one-way motion locking ring 9 is located within the groove 26, with one end abutting against the inner wall of the groove 26 and the other end abutting against the stepped surface of the stepped hole in the thrust sleeve 6, thus ensuring the one-way motion locking ring 9 is stably installed between the thrust sleeve 6 and the cone 10. A locking structure 27 is provided on the outer wall of the central tube 7 to restrict the one-way motion locking ring 9 from sliding away from the upper connector 22. The locking structure 27 can be helical teeth or one-way teeth distributed on the outer wall of the one-way motion locking ring 9 and the central tube 7, ensuring that under the action of the one-way motion locking ring 9, the thrust sleeve 6 and the cone assembly can only slide towards the upper connector 22 and cannot slide away from it.

[0034] Reference Figure 1 , Figure 2 , Figure 7 and Figure 9 The rubber sleeve assembly includes a sealing elongated rubber sleeve 13 and multiple metal rings 14. The sealing elongated rubber sleeve 13 is slidably fitted onto the central tube 7. The multiple metal rings 14 are evenly distributed along the axial direction of the central tube 7 on the inner wall of the sealing elongated rubber sleeve 13, and all the metal rings 14 are arranged around the central tube 7. Under high pressure, the material of the sealing elongated rubber sleeve 13 tends to flow to the area with lower pressure, which may lead to structural collapse or relaxation of sealing stress. Therefore, the evenly distributed multiple metal rings 14 form a continuous internal support skeleton inside the sealing elongated rubber sleeve 13. This skeleton provides continuous radial support throughout the deformation process of the sealing elongated rubber sleeve 13, resists the external ultra-high confining pressure, and prevents the sealing elongated rubber sleeve 13 from being crushed or undergoing irregular creep.

[0035] In addition, refer to Figure 9 In this embodiment, the metal ring 14 has a triangular cross-section, with one of its apexes facing away from the central tube 7. Under pressure, the apex of the triangular cross-section preferentially concentrates stress, guiding the sealing elongated rubber sleeve 13 to expand outward in an orderly manner. Under axial compression, the triangular cross-section generates radial thrust; that is, the inclined surface of the metal ring 14 converts part of the axial setting force into a radial component that pushes the sealing elongated rubber sleeve 13 outward, thereby increasing the contact stress between the sealing elongated rubber sleeve 13 and the casing 31 without significantly increasing the setting load. This mechanism is particularly helpful in maintaining high interface sealing pressure under ultra-high pressure well conditions. Under axial compression, each metal ring 14 independently converts a portion of the axial force into an outward radial component. Due to their uniform arrangement, these radial forces form a series of stable and regularly distributed contact stress peaks along the entire length of the rubber sleeve.

[0036] Reference Figure 1 , Figure 2 , Figure 7 and Figure 9The rubber sleeve assembly also includes a protective rubber sleeve 12 and a shoulder 15 fitted onto the central tube 7. The protective rubber sleeve 12 is located on the end of the sealing long rubber sleeve 13 near the conical insertion assembly, and the shoulder 15 is located on the end of the sealing long rubber sleeve 13 near the slip assembly. The protective rubber sleeve 12 and the shoulder 15 can axially and radially limit the end of the sealing long rubber sleeve 13, preventing the sealing long rubber sleeve 13 from being extruded and causing end protrusion. The protective rubber sleeve 12 has a hardness 5~10 Shore A higher than the sealing long rubber sleeve 13, and the shoulder 15 is made of a softer metal material or plastic. One end of the shoulder protector 15 is tightly wrapped around the sealing long rubber tube 13, and the other end is tapered and points towards the slip assembly. The end of the protective rubber tube 12 away from the sealing long rubber tube 13 has a bowl-shaped abutment groove 28, so that the cone 10 can stably cone into the space between the protective rubber tube 12 and the central tube 7. Thus, the protective rubber tube 12 applies a uniform thrust to the end of the sealing long rubber tube 13, preventing the sealing long rubber tube 13 from collapsing or turning inward due to uneven force.

[0037] In the initial setting stage, multiple metal rings 14 provide radial support to the sealing elongated rubber sleeve 13, efficiently converting the thrust into a radially expanding wedging force. During compression, they guide the rubber sleeve material in the adjacent area to preferentially expand radially and coordinate the transmission of axial stress, preventing the sealing elongated rubber sleeve 13 from collapsing or turning inward under high pressure due to its excessive length. This ensures that the thrust can be effectively converted into the overall radial expansion of the sealing elongated rubber sleeve 13. At the same time, the metal rings 14 act as plastic gaskets, undergoing controllable deformation during axial compression. This helps to more evenly transmit the internal stress of the sealing elongated rubber sleeve 13 along its entire length, preventing buckling or local bulging in the middle section of the sealing elongated rubber sleeve 13 and creating a good stress transmission path for the anchoring of the slip assembly. When the slip assembly is anchored and the final high-pressure setting force is applied through the central tube 7, the metal rings 14 at the near end act as a first-level amplification unit, preferentially converting the huge axial force into a powerful radial sealing force, and transmitting and amplifying this effect to the entire length of the sealing elongated rubber sleeve 13 through multiple metal rings 14.

[0038] To ensure that the slip assembly can be driven and engaged into the inner wall of the sleeve 31 before the sealing sleeve 13 is fully compressed and set, refer to... Figure 1 , Figure 2 and Figure 7 A setting block 17 is also fitted on the central tube 7. The setting block 17 is located between the sealing long rubber tube 13 and the slip assembly, and the setting block 17 is temporarily fixed on the central tube 7 by the second shear screw 24.

[0039] Reference Figure 2 and Figure 3Before setting, the thrust sleeve 6 is temporarily fixed to the central tube 7 by the first shear screw 8. During setting, the piston 5 slides away from the cylinder body. At this time, the centering block 2 acts as a reaction force support for the cylinder body, so that the piston 5 can press against the thrust sleeve 6. As the thrust applied to the thrust sleeve 6 by the liquid in the inlet hole 23 increases, the first shear screw 8 is sheared. The thrust sleeve 6 drives the liquid cylinder 3 to slide towards the upper connector 22 on the central tube 7. The thrust sleeve 6 pushes the conical assembly to slide towards the sealing long rubber tube 13, so that the cone 10 can be inserted between the sealing long rubber tube 13 and the central tube 7, forcing the sealing long rubber tube 13 to expand radially. Meanwhile, the setting block 17 is temporarily fixed to the central tube 7 by the second shear screw 24. The setting block 17 can block the other end of the sealing elongated rubber tube 13, causing the sealing elongated rubber tube 13 to be squeezed and deformed. At this time, the sealing elongated rubber tube 13 has not yet been able to effectively seal the annular space between the central tube 7 and the sleeve 31. As the liquid pressure in the inlet hole 23 increases, the deformed sealing elongated rubber tube 13 applies a thrust to the setting block 17, causing the second shear screw 24 to be sheared. At this time, the sealing elongated rubber tube 13 can push the setting block 17 to slide smoothly towards the slip assembly and press against the slip assembly, causing the slip assembly to expand and enter the inner wall of the sleeve 31. The piston 5 continues to apply thrust. Due to the obstruction of the slip assembly, the setting block 17 cannot continue to move, so the sealing elongated rubber tube 13 is squeezed and deformed again until the sealing elongated rubber tube 13 can effectively seal the annular space between the central tube 7 and the sleeve 31. It is worth noting that the first shear screw 8 and the second shear screw 24 here can serve as a temporary barrier, effectively preventing the packer from getting stuck midway during the process of being lowered into the wellbore along the casing 31.

[0040] Reference Figure 8 A sand-proof ring 16 is also fitted around the center tube 7, positioned between the shoulder 15 and the setting block 17. The slip assembly includes a slip cone 18, a split slip 19, a spring ring 20, and a supporting outer cylinder 21. The slip cone is fitted onto the center tube 7 and threadedly connected to the setting block 17. The split slip 19 is fitted onto the center tube 7 and mates with the conical surface of the slip cone. The spring ring 20 is placed in the arc-shaped groove of the split slip 19. The upper end of the split slip 19 is L-shaped and fixed in the square groove of the supporting outer cylinder 21. The supporting outer cylinder 21 is threadedly connected to the upper connector 22. Under the combined action of the supporting outer cylinder 21 and the spring ring 20, as the sealing elongated rubber sleeve 13 pushes the setting block 17 to slide, the slip cone 18 cones into the split slip 19, allowing the split slip 19 to quickly expand and anchor against the inner wall of the sleeve 31, forming a stable support.

[0041] The implementation principle of the cone-pressure two-stage setting packer in this embodiment is as follows: After the packer is lowered into the target layer along with the tubing, high-pressure liquid enters the cavity 32 through the inlet hole 23 on the central tube 7 by pressurization, thereby pushing the piston 5 to slide away from the cylinder. When the liquid reaches a certain high pressure, the first shear screw 8 is sheared, and the piston 5 drives the thrust sleeve 6, the one-way motion locking ring 9, and the cone 10 to move towards the upper connector 22 until the cone 10 is inserted into the protective rubber sleeve 12, thereby compressing the sealing long rubber sleeve 13. At this time, the sealing long rubber sleeve 13 is not completely compressed to achieve setting. As the piston 5 continues to apply thrust, the deformed sealing elongated rubber sleeve 13 acts on the setting block 17, causing the second shear screw 24 to be sheared. At this time, the sealing elongated rubber sleeve 13 can push the setting block 17 to slide towards the slip assembly until the setting block 17 pushes the slip cone 18 into the split slip 19, so that the split slip 19 can quickly expand and anchor to the inner wall of the sleeve 31, forming a stable support.

[0042] Since the slip assembly no longer moves after forming a stable support, the sealing rubber sleeve 13 can complete full and uniform axial compression and radial expansion along its entire length under the action of high-pressure liquid. This forms a sealing band with a large contact area, high contact stress, and continuous and complete distribution with the sleeve 31, effectively sealing off the ultra-high-pressure fluid and preventing the generation of local leakage channels.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cone-pressed two-stage setting packer, characterized in that, It includes a central tube and a hydraulic cylinder, a thrust assembly, a one-way motion locking ring, a conical insertion assembly, a rubber sleeve assembly, and a slip assembly sequentially sleeved on the central tube. The thrust assembly is fixedly connected to the central tube by a first shear screw. The piston of the hydraulic cylinder can generate an axial driving force, causing the thrust assembly to slide on the central tube, so that the first shear screw is sheared. Then, the piston of the hydraulic cylinder can drive the thrust assembly to push the one-way motion locking ring, the cone insertion assembly, the rubber sleeve assembly and the slip assembly in sequence along the central tube axis, so that the slip assembly is inserted into the inner wall of the sleeve. After the slip assembly enters the inner wall of the sleeve, the piston of the hydraulic cylinder continues to generate axial driving force, driving the thrust assembly to push the one-way motion locking ring, the conical insertion assembly and the rubber sleeve assembly in sequence along the central tube axis, so that the rubber sleeve assembly is fully compressed to achieve setting and sealing, and the setting state is locked by the one-way motion locking ring. During the entire driving process of the piston in the hydraulic cylinder, the cone at one end of the conical assembly can be inserted between the rubber sleeve assembly and the central tube, forcing the rubber sleeve assembly to expand radially.

2. The cone-pressed two-stage setting packer according to claim 1, characterized in that, The rubber sleeve assembly includes a sealed long rubber sleeve and multiple metal rings. The sealed long rubber sleeve is sleeved on the central tube, and the multiple metal rings are evenly distributed on the inner wall of the sealed long rubber sleeve along the axial direction of the central tube, and the multiple metal rings are arranged around the central tube.

3. The cone-pressed two-stage setting packer according to claim 2, characterized in that, The metal ring has a triangular cross-section, with one of the sharp corners of the triangle facing away from the central tube.

4. The cone-pressed two-stage setting packer according to claim 2, characterized in that, The rubber sleeve assembly also includes a protective rubber sleeve and a shoulder for axially and radially limiting the end of the sealing long rubber sleeve. The protective rubber sleeve and the shoulder are respectively disposed at both ends of the sealing long rubber sleeve, and both the protective rubber sleeve and the shoulder are sleeved on the central tube.

5. A cone-pressed two-stage setting packer according to claim 1, characterized in that, The cone-shaped assembly includes a cone and a plastic ring arranged coaxially. The plastic ring is arranged around the outside of the cone, and the cone is sleeved on the central tube. One end of the cone is fixedly connected to one end of the thrust assembly.

6. A cone-pressed two-stage setting packer according to claim 5, characterized in that, The thrust assembly includes a thrust sleeve, which is fitted onto the central tube. One end of the thrust sleeve is in contact with the piston of the hydraulic cylinder, and the other end is threaded onto the end of the cone.

7. A cone-pressed two-stage setting packer according to claim 6, characterized in that, The one-way motion locking ring is unidirectionally slidably sleeved on the central tube, the cone is covered on the outside of the one-way motion locking ring, and the one-way motion locking ring is locked between the cone and the thrust sleeve.

8. A cone-pressed two-stage setting packer according to claim 6, characterized in that, The inner wall of the thrust sleeve is provided with an inner cavity, and the thrust sleeve is also provided with a drain hole communicating with the inner cavity. The inner cavity and the drain hole can discharge the liquid that enters between the thrust sleeve and the central tube.

9. A cone-pressed two-stage setting packer according to claim 1, characterized in that, The central tube is also fitted with a setting block, which is located between the sealing long rubber tube and the slip assembly.

10. A cone-pressed two-stage setting packer according to claim 9, characterized in that, The sealing block is temporarily fixed to the central tube by the second shear screw.

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