Top packer of metal deformation inner bone type drilling liner hanger

Abstract

The top packer comprises an inner barrel and an outer barrel, the bottom of a setting limiting barrel is fixedly connected with the top of a setting center pipe, and the outer barrel comprises a setting stress application barrel, a setting force transmission sleeve, a setting centralizing ring and a metal deformation inner bone which are sequentially connected. The metal deformation inner bone is made of a special alloy material which can deform under the action of pressure and is enhanced in strength after deformation, the metal alloy inner bone is of a cylinder structure, the side wall of the cylinder structure is of an arc-shaped structure with the middle position arching outwards, the wall thickness of the vertex position of the arc-shaped structure is minimum, and the thickness of the arc-shaped structure is smaller than that of the special alloy material. And the thicknesses of the two side walls at the vertex position are gradually increased. By arranging the metal deformation inner bone, the problems that a top packer of a traditional drilling liner hanger is insufficient in pressure bearing capacity, reduced in sealing performance, greatly affected by temperature, prone to setting in advance and the like under the active well condition of a high-pressure high-temperature ultra-deep gas layer are solved.

Description

Technical Field

[0001] This invention relates to the field of downhole tool manufacturing technology in the oil and gas industry, and in particular to a top packer for a metal deformable internal bone tailpipe hanger. Background Technology

[0002] In the exploration and development of oil and gas, tailpipe cementing is a crucial step in ensuring the safe and stable production of oil and gas wells. Packers, as one of the key pieces of equipment in tailpipe cementing, directly affect cementing quality and operational safety. Conventional packers primarily achieve sealing through compression or expansion of the rubber sleeve. However, in complex deep wells and under conditions of high pressure, high temperature, and active ultra-deep gas formations, these conventional packers often present the following problems: 1. Packer premature setting: Due to factors such as material properties and narrow annular design gap, the packer sets before reaching the predetermined position. The tubing string must be pulled out, the packer-type tailpipe hanger replaced, and then it must be re-run, increasing drilling time and downhole operation risks.

[0003] 2. Insufficient pressure bearing capacity: Under high pressure and high temperature environments, the pressure bearing capacity of traditional packers often cannot meet the needs of on-site operations, and leakage or rupture is likely to occur.

[0004] 3. Decreased sealing performance: Affected by factors such as circulation volume and rock debris encapsulation, the expanded rubber sleeve is prone to slippage or tilting, resulting in decreased sealing performance.

[0005] 4. Susceptible to temperature: The rubber sleeve material in traditional packers is prone to aging and deformation under high temperature environments, which affects the sealing effect.

[0006] Therefore, in order to address the above problems, this invention proposes a novel top packer structure for the suspension device to improve the packer's pressure-bearing capacity, sealing performance, and operational safety.

[0007] Patent application CN118128467A discloses a packer device aimed at alleviating the technical problems of existing packers failing to seal or having unsatisfactory sealing effects when applied to different working conditions. The packer device includes a central tube and a rubber sleeve assembly; the rubber sleeve assembly is fitted onto the central tube and can slide along the axial direction of the central tube; along the axial direction of the central tube, the rubber sleeve assembly has two mutually distant ends, with only one end fixed to the central tube. This invention compresses and deforms the rubber sleeve assembly, causing the deformed assembly to make tight contact with the inner wall of the open hole, thus achieving effective sealing of the open hole well.

[0008] However, this patent has limited sealing capabilities: its main sealing relies on the tight fit between the rubber and the inner wall of the casing to achieve a seal. The sealing capability of rubber in the high-temperature environment downhole is far lower than that of metal because: 1. Temperature adaptability: Rubber has limited high-temperature resistance (rubber has the characteristic of a sharp decrease in hardness and strength as temperature rises); while metal seals can maintain a stable sealing effect in high-temperature environments. Packers are used in high-temperature downhole environments (80-260℃).

[0009] 2. Pressure resistance: Metal seals perform better under high pressure and can withstand extremely high pressure; rubber seals provide a good seal under low pressure, but may deform under high pressure. Metal inner seals have even higher pressure resistance.

[0010] 3. Corrosion Resistance: Metal seals have excellent corrosion resistance and are suitable for corrosive environments; while rubber seals may be more sensitive to certain chemicals and are prone to aging and brittleness. Downhole environments are corrosive environments containing acids, alkalis, and oils.

[0011] 4. Service life: Metal seals generally have a longer service life; rubber seals have a relatively shorter service life.

[0012] Furthermore, its practicality is low: its multi-segment uniformly protruding internal skeleton structure cannot accurately control the expansion seal initiation pressure under axial force; the glue barrel has poor stability: the multi-segment uniformly protruding structure of the metal internal skeleton makes the glue barrel components too long, and the specific position of the expansion seal cannot be accurately controlled. Interference easily occurs between the segments, affecting the stability and sealing ability of the glue barrel. Adding a shoulder can only ensure the stability of the expansion seal of the outermost protruding segment, but cannot increase the stability of the expansion seal of the middle segment; and due to its excessive length, the processing difficulty and cost when converting it into products are too high. Summary of the Invention

[0013] This invention aims to provide a metal deformable internal bone type top packer for tailpipe hangers. By setting a metal deformable internal bone, it solves the problems of insufficient pressure-bearing capacity, decreased sealing performance, large temperature influence, and easy premature setting of traditional top packers for tailpipe hangers in active well conditions of high pressure, high temperature and ultra-deep gas formations. At the same time, this invention also has the advantages of simple structure, convenient operation and strong adaptability, and can be widely used in tailpipe cementing operations in the field of oil and gas exploration and development.

[0014] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: A metal deformable inner bone type tailpipe suspension top packer includes an inner cylinder and an outer cylinder. The outer cylinder includes a setting force-increasing cylinder, a setting force-transmitting sleeve, a setting centering ring, and a metal deformable inner bone connected in sequence. The setting force-increasing cylinder, the setting centering ring, the setting force-transmitting sleeve, and the metal deformable inner bone are sleeved on the outside of the inner cylinder and can slide along the axial direction of the inner cylinder. The bottom of the metal deformable inner bone is fixedly connected to the inner cylinder through a setting force-bearing ring. The metal deformable inner bone is made of a special alloy material that can deform under pressure and has increased strength after deformation. The metal alloy inner bone has a cylindrical structure. The side wall of the cylindrical structure is an arc-shaped structure that arches outward from the middle position. The wall thickness is smallest at the apex of the arc-shaped structure, and the wall thickness gradually increases on both sides of the apex.

[0015] The inner cylinder includes a setting limiting cylinder and a setting center tube. The bottom of the setting limiting cylinder is fixedly connected to the setting center tube. A stepped structure for limiting the movement distance of the setting force-adding cylinder is provided at corresponding positions on the outer side of the setting limiting cylinder and the inner side of the setting force-adding cylinder. A setting shear pin is provided between the setting force cylinder and the setting limit cylinder to constrain the relative movement between them, preventing relative movement between the setting force cylinder and the setting limit cylinder during the lowering of the packer. After the packer is lowered into place, pressure is applied to the setting force cylinder. When the pressure reaches a certain value, the setting shear pin is cut, and the setting force cylinder and the setting limit cylinder move relative to each other. The inner side of the set-sealing force transmission sleeve has an anti-retraction tooth sleeve, and the outer side of the set-sealing central tube has an annular one-way toothed structure that cooperates with the anti-retraction tooth sleeve. The anti-retraction tooth sleeve and the annular one-way toothed structure cooperate with each other to form a one-way self-locking, ensuring that the force of compressing the deformed inner bone of the metal can only be transmitted downward and not upward. A rubber sealing unit is fitted on the outer side of the metal deformable inner bone, and the inner side of the rubber sealing unit is tightly connected to the outer side of the metal deformable inner bone so that it deforms together with the metal deformable inner bone. Multiple stress grooves are provided on both sides of the outer apex of the metal alloy inner bone. In actual use, the sealing pressure of the packer can be controlled by designing parameters such as the width, number and depth of the stress grooves, and the metal alloy inner bone can be uniformly expanded when axially compressed to avoid local stress concentration. Both sides of the stress groove are provided with outward protrusions. When the metal alloy inner bone is deformed by force, each protrusion expands outward and fits tightly against the inner wall of the upper sleeve, forming a surface contact with the inner wall of the upper sleeve, resulting in a better sealing effect. The inner side of the deformable metal inner bone is provided with a groove structure for installing a seal, so as to constrain the installation gap on the inner side of the metal inner bone. The outer side of the setting and centering ring has a centering ridge structure with an increased outer diameter. The centering ridge structure is a discontinuous arc structure with an outer diameter greater than the outer diameter of the rubber sealing unit, evenly distributed around the outer circumference of the setting and centering ring. There are 4-6 discontinuous arc structures. The centering ridge structure is used to increase the centering of the packer-type tailpipe hanger in the well, protect the metal inner skeleton from well wall impact and entrapment, and at the same time reduce the throttling effect of the increased outer diameter on fluid flow.

[0016] The metal alloy inner skeleton is provided in multiple parts, and each pair of metal alloy inner skeletons is separated by a steel spacer ring.

[0017] The beneficial effects of this invention are: 1. In this invention, the metal deformable inner bone adopts an inner and outer double-arc deformable structure, made of a special alloy material. This structure has the following characteristics: Double-arc deformation structure: The inner and outer sides of the metal deformable inner bone are designed with multi-segment arc structures so that it can expand evenly under axial compression and avoid local stress concentration; the inner side of the metal edge inner bone is designed with a groove structure for installing seals to constrain the installation gap on the inner side of the metal inner bone. Special alloy material: The metal deformable inner skeleton is made of special alloy material, which has high compressive strength and deformation performance. It can maintain stable structure and performance in complex deep well, high pressure and high temperature environment, and avoid premature sealing of packer under mechanical friction or drilling fluid scouring friction. Controllable deformation: By designing reasonable structural parameters and deformation sequence, the metal deformable inner skeleton can achieve controllable deformation to adapt to different wellbore conditions and operational requirements.

[0018] 2. The packer of this invention has strong sealing capability: Through the inner and outer double-arc deformation structure of the metal deformable inner skeleton, this invention can achieve radial outward expansion under axial compression, tightly fitting with the inner wall of the upper casing to form a stable pressure support wall. Simultaneously, the rubber sealing unit closely cooperates with the metal deformable inner skeleton, forming a dual sealing effect of metal compression and rubber filling, greatly enhancing the packer's sealing capability. Even under high-pressure, high-temperature, and ultra-deep gas-rich well conditions, this invention can maintain excellent sealing performance, effectively preventing annular air leakage.

[0019] 3. The packer of this invention has stable sealing performance: This invention uses special rubber materials that are resistant to high temperature and high pressure to make the rubber sealing unit, ensuring the stability of the sealing performance under high temperature and high pressure environments. At the same time, the high-strength alloy material of the metal deformable inner core also ensures the stability and reliability of the structure under extreme environments, thereby ensuring the stability of the overall sealing performance of the packer.

[0020] 4. The packer of this invention has strong adaptability: the inner and outer double-arc deformation structure of the metal deformable inner skeleton and the elasticity and compressibility of the rubber sealing unit enable this invention to adapt to different wellbore clearances and formation pressure variations. Regardless of whether the wellbore conditions are large or small, this invention can achieve a good sealing effect by adjusting the deformation of the metal deformable inner skeleton and the compression of the rubber sealing unit.

[0021] 5. The packer of this invention is simple and reliable to operate: The force transmission mechanism of this invention is reasonably designed and easy and reliable to operate. Through pre-designed deformation initiation pressure and the relationship between pressure and deformation (derived from software simulation and actual experiments), precise control of the internal bone deformation process of the metal deformation is achieved. Simultaneously, the setting of limiting steps and anti-retraction toothed sleeves ensures that the packer maintains a stable state after reaching the optimal expansion sealing position, preventing excessive structural deformation and failure.

[0022] 6. The packer of this invention offers high safety: Both the metal deformable inner core and the rubber sealing unit are meticulously designed and optimized to ensure safety and reliability under extreme environments such as high pressure and high temperature. Furthermore, the precise control of the force transmission mechanism and the inclusion of limiting steps further enhance the safety and reliability of the packer. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the top packer of the metal deformable internal bone tailpipe suspension of the present invention.

[0024] Figure 2 This is a schematic diagram of the metal deformable internal bone structure of the present invention.

[0025] Figure 3 This is a cross-sectional view of the metal deformable internal bone of the present invention.

[0026] Figure 4 This is a partial structural diagram of the packer of the present invention.

[0027] The components include: 1. Outer cylinder; 2. Inner cylinder; 3. Setting force-increasing cylinder; 4. Setting force-transmitting sleeve; 5. Setting centering ring; 6. Metal deformation inner rib; 7. Setting force-bearing ring; 8. Setting limit cylinder; 9. Setting center tube; 10. Stepped structure; 11. Setting shear pin; 12. Anti-reverse toothed sleeve; 13. Rubber sealing unit; 14. Stress groove; 15. Groove structure; 16. Centering ridge structure. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0029] Example 1 This embodiment provides a method such as Figure 1-4The metal deformable inner bone type tailpipe suspension top packer shown includes an inner cylinder 2 and an outer cylinder 1. The bottom of the setting limit cylinder 8 is fixedly connected to the top of the setting center tube 9. The outer cylinder 1 includes a setting force-increasing cylinder 3, a setting force-transmitting sleeve 4, a setting centering ring 5, and a metal deformable inner bone 6 connected in sequence. The setting force-increasing cylinder 3, the setting force-transmitting sleeve 4, the setting centering ring 5, and the metal deformable inner bone 6 are sleeved on the outside of the inner cylinder 2 and can slide along the axial direction of the inner cylinder 2. The bottom of the metal deformable inner bone 6 bears the force of the setting. The ring 7 is fixedly connected to the inner cylinder 2. The metal deformable inner bone 6 is made of a special alloy material that can deform under pressure and has increased strength after deformation. The metal alloy inner bone is a cylindrical structure. The side wall of the cylindrical structure is an arc-shaped structure that arches outward from the middle position. The wall thickness is the smallest at the apex of the arc-shaped structure, and the wall thickness gradually increases on both sides of the apex. The lower end of the setting center tube 9 is connected to the sealing tailpipe hanger joint part to restrain the setting bearing ring 7 from moving downward.

[0030] In this embodiment, the metal deformable inner core 6 should be made of a material with sufficient strength, good ductility, and significantly increased strength after plastic deformation. Examples include: pure copper in T2 or T3 condition, annealed and aged 316 stainless steel (hardness HWB85-95), and specially treated 20CrNiMo. To achieve the effects described in this patent, the yield strength is optimally between 175MPa and 230MPa, and the reduction of area is optimally between 40% and 60%. The technical specifications of the above materials all meet these requirements.

[0031] In this embodiment, after the packer is placed in the predetermined position, the axial pressure application device is adjusted through the wellhead device to apply downward axial pressure to the setting force-enhancing cylinder 3. The setting force transmission sleeve 4 applies a certain axial pressure to the deformable metal inner skeleton 6, causing the deformable metal inner skeleton 6 to undergo axial compression and radial outward expansion, tightly fitting against the inner wall of the upper casing. In this state, the deformable metal inner skeleton 6 forms a stable sealing structure, effectively preventing annular air leakage.

[0032] Example 2 Compared with Embodiment 1, the difference in this embodiment is that, in this embodiment, the inner cylinder 2 includes a setting and limiting cylinder 8 and a setting center tube 9. The bottom of the setting and limiting cylinder 8 is fixedly connected to the setting center tube 9. A stepped structure 10 for limiting the movement distance of the setting force-adding cylinder 3 is provided at the corresponding positions on the outer side of the setting and limiting cylinder 8 and the inner side of the setting force-adding cylinder 3. A setting shear pin 11 for constraining the relative movement between the setting force-adding cylinder 3 and the setting and limiting cylinder 8 is provided between the setting force-adding cylinder 3 and the setting and limiting cylinder 8. The inner side of the setting force-transmitting sleeve 4 has an anti-reverse toothed sleeve 12. The outer side of the setting center tube 9 has an annular one-way toothed structure that cooperates with the anti-reverse toothed sleeve 12. The anti-reverse toothed sleeve 12 and the annular one-way toothed structure cooperate with each other to form a one-way self-locking mechanism. The rest of the structure is the same as in Embodiment 1.

[0033] In this embodiment, during the lowering of the packer, the setting shear pin 11 between the setting force cylinder 3 and the setting limit cylinder 8 prevents relative movement between the setting force cylinder 3 and the setting limit cylinder 8 during the lowering of the packer. After the packer is lowered into place, pressure is applied to the setting force cylinder 3. When the pressure reaches a certain value, the setting shear pin 11 is cut off, and the setting force cylinder 3 and the setting limit cylinder 8 move relative to each other, thereby compressing the metal deformable inner bone 6 and causing it to begin to deform. When the metal deformable inner bone 6 reaches the optimal expansion and sealing position, axial limiting is achieved through the step structure 10 at the corresponding positions on the outer side of the setting limiting cylinder 8 and the inner side of the setting force cylinder 3, so as to prevent excessive deformation of the metal deformable inner bone 6 structure. At the same time, the anti-reverse tooth sleeve 12 in the force transmission mechanism keeps in a reverse locked state to ensure that the packer is always in the best sealing state.

[0034] Example 3 The difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 3 As shown, a rubber sealing unit 13 is sleeved on the outer side of the metal deformable inner bone 6. The inner side of the rubber sealing unit 13 is tightly joined to the outer side of the metal deformable inner bone 6. The rest of the structure is the same as in Embodiment 1.

[0035] In this embodiment, the inner side of the rubber sealing unit 13 is tightly joined to the outer side of the metal deformable inner bone 6 so that it deforms together with the metal deformable inner bone 6. When the metal deformable inner bone 6 deforms, it breaks through the rubber sealing unit 13 and fits tightly against the inner wall of the upper sleeve to form a seal. The rubber sealing unit 13 wraps around the metal deformable inner bone 6 around the point of contact between the metal deformable inner bone 6 and the inner wall of the upper sleeve to assist in the seal. The metal deformable inner bone 6 and the rubber sealing unit 13 together form a stable sealing structure, which works in conjunction with the sealing effect of the inner sealing element of the metal deformable inner bone 6.

[0036] Example 4 The difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 2 and Figure 3 As shown, multiple stress grooves 14 are provided on both sides of the outer vertex position of the metal alloy inner bone; both sides of the stress grooves 14 are provided with outward protrusions, and the rest of the structure is the same as in Embodiment 1.

[0037] In this embodiment, by setting stress grooves 14, the initiation pressure of deformation of the metal inner bone can be reduced. Given fixed materials and other design dimensions, the sealing pressure of the packer can be controlled during actual use by designing parameters such as the width, number, and depth of the stress grooves 14. This also allows the metal alloy inner bone to expand uniformly under axial compression, avoiding localized stress concentration. The controllable deformation initiation force improves the standardization and reliability of the product. When the metal alloy inner bone deforms under stress, each protrusion expands outward and fits tightly against the inner wall of the upper sleeve, forming surface contact and resulting in a better sealing effect.

[0038] Example 5 Compared with Example 4, in this embodiment, multiple metal alloy inner bones are provided, and each pair of metal alloy inner bones is separated by a steel spacer ring. The rest of the structure is the same as in Example 4.

[0039] In this embodiment, multiple metal alloy inner ribs are provided to improve sealing pressure and reliability. By adjusting the size, material, and stress groove 14 of each metal alloy inner bone, the starting pressure of each metal alloy inner bone can be controlled, and the lower ones can be controlled to deform first. This avoids the upper metal inner bone from contacting the inner wall of the outer sleeve and then undergoing axial displacement when deformation occurs simultaneously, thus affecting its sealing effect.

[0040] Example 6 Compared with Embodiment 1, the difference in this embodiment is that the inner side of the metal deformable inner bone 6 is provided with a groove structure 15 for installing the sealing element, and the rest of the structure is the same as in Embodiment 1.

[0041] In this embodiment, a sealing element is installed in the groove structure 15, and the metal inner core forms a seal with the outer tube wall. The sealing element here forms a seal with the central tube, and the entire annular channel is sealed.

[0042] Example 7 The difference between this embodiment and Embodiment 1 is that, in this embodiment, the outer side of the setting and straightening ring 5 has a straightening ridge structure 16 with an increased outer diameter. The straightening ridge structure 16 is a discontinuous arc structure with an outer diameter larger than the outer diameter of the rubber sealing unit 13, evenly distributed around the outer circumference of the setting and straightening ring 5. The number of discontinuous arc structures is 4-6. The rest of the structure is the same as in Embodiment 1.

[0043] In this embodiment, the straightening rib structure 16 is used to increase the centering of the packer-type tailpipe hanger in the well, while reducing the throttling effect of the increased outer diameter on fluid flow.

[0044] Application Example 1 In Application Example 1, the metal deformable inner core type 6 tailpipe hanger top packer was used in the tailpipe cementing operation of an active high-pressure, high-temperature, ultra-deep gas reservoir well (Ketan 106 well, Tarim Oilfield, Xinjiang Uygur Autonomous Region). After cementing, pressure was applied to the setting booster cylinder 3 through the wellhead device. When the pressure increased to 10t, the setting shear pin 11 was sheared, and the pressure was transmitted from the force transmission mechanism to the metal deformable inner core 6. The force on the metal inner core gradually increased to the deformation start pressure of 20t. The metal deformable inner core 6 underwent axial compression and radial outward expansion according to the designed deformation sequence, tightly fitting against the inner wall of the upper casing. When the pressure reached 35t, the metal deformable inner core 6 reached the optimal expansion sealing position, and the inner tube limiting step achieved axial limiting, preventing excessive structural deformation. At the same time, the anti-reverse toothed sleeve 12 in the force transmission mechanism maintained a reverse locking state, ensuring that the packer was always in the optimal sealing state. In this state, the deformable metal inner core 6 and the rubber sealing unit 13 together form a stable sealing structure. Combined with the sealing effect of the inner sealing element of the deformable metal inner core 6, annular sealing is effectively achieved. The packer was pressure tested at 12 MPa and stabilized for 10 minutes. The pressure did not drop, indicating that the pressure test was qualified.

[0045] Practical application has verified that this invention has achieved good results in the tailpipe cementing operation of this well.

[0046] Application Example 2 In Application Example 2, the metal deformable inner core type 6 tailpipe hanger top packer was used in the tailpipe cementing operation of a complex deep well. This well had a large casing annulus clearance and significant formation pressure variations. By adjusting the deformation of the metal deformable inner core 6 and the compression of the rubber sealing unit 13, the invention successfully adapted to the wellbore conditions and formation pressure changes. During the cementing operation, the invention maintained a stable packing effect and good sealing performance, effectively preventing oil and gas upwelling. Practical application verification showed that the invention also achieved good results in the tailpipe cementing operation of this well.

[0047] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A metal deformable internal bone type tailpipe suspension top packer, characterized in that: The device includes an inner cylinder (2) and an outer cylinder (1). The outer cylinder (1) includes a setting force-increasing cylinder (3), a setting force-transmitting sleeve (4), a setting centering ring (5), and a metal deformable inner bone (6) connected in sequence. The setting force-increasing cylinder (3), the setting force-transmitting sleeve (4), the setting centering ring (5), and the metal deformable inner bone (6) are sleeved on the outside of the inner cylinder (2) and can slide along the axial direction of the inner cylinder (2). The bottom of the metal deformable inner bone (6) is fixedly connected to the inner cylinder (2) through a setting force-bearing ring (7). The metal deformable inner bone (6) is made of a special alloy material that can deform under pressure and has increased strength after deformation. The metal alloy inner bone is a cylindrical structure. The side wall of the cylindrical structure is an arc-shaped structure that arches outward at the middle position. The wall thickness is the smallest at the apex of the arc-shaped structure, and the wall thickness gradually increases on both sides of the apex.

2. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that: The inner cylinder (2) includes a setting limiting cylinder (8) and a setting center tube (9). The bottom of the setting limiting cylinder (8) is fixedly connected to the setting center tube (9). A stepped structure (10) for limiting the movement distance of the setting force cylinder (3) is provided at the corresponding positions on the outer side of the setting limiting cylinder (8) and the inner side of the setting force cylinder (3).

3. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that: A setting shear pin (11) is provided between the setting force cylinder (3) and the setting limit cylinder (8) to constrain the relative movement between the setting force cylinder (3) and the setting limit cylinder (8).

4. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that: The inner side of the set-seal force transmission sleeve (4) has an anti-retraction tooth sleeve (12), and the outer side of the set-seal center tube (9) has an annular one-way tooth structure that cooperates with the anti-retraction tooth sleeve (12). The anti-retraction tooth sleeve (12) and the annular one-way tooth structure cooperate with each other to form a one-way self-locking mechanism.

5. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that: A rubber sealing unit (13) is fitted on the outer side of the metal deformable inner bone (6), and the inner side of the rubber sealing unit (13) is tightly joined to the outer side of the metal deformable inner bone (6).

6. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that: Multiple stress grooves (14) are provided on both sides of the apex position of the outer side of the metal alloy inner bone.

7. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 6, characterized in that: Both sides of the stress groove (14) are provided with outward protrusions.

8. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that: The inner side of the metal deformable inner bone (6) is provided with a groove structure (15) for installing a seal.

9. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that: The outer side of the seat sealing and straightening ring (5) is provided with a straightening ridge structure (16). The straightening ridge structure (16) is a discontinuous arc structure with an outer diameter greater than the outer diameter of the rubber sealing unit (13) evenly distributed on the outer circumference of the seat sealing and straightening ring (5). The number of discontinuous arc structures is 4-6.

10. The top packer of the metal deformable internal bone type tailpipe suspension according to claim 1, characterized in that, The metal alloy inner skeleton is provided in multiple parts, and each pair of metal alloy inner skeletons is separated by a steel spacer ring.

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