Built-in oil pipe inner wall gripper and self-sealing packer rubber core installation device

Abstract

The utility model belongs to oilfield development equipment field discloses a built -in oil pipe inner wall occluder and self -sealing packer rubber core installation device, and the occluder includes lance and occlusion block, and the lance side wall is provided with the chute of inclination, and the occlusion block is slidably arranged in the chute, when the occlusion block slides to the lower part of the chute, the farthest distance between its outer wall and the central shaft of lance is greater than the farthest distance between its outer wall and the central shaft of lance when the occlusion block slides to the upper part of the chute, when the occlusion block slides to the lowermost part of the chute, its outer wall protrudes from the outer circumferential surface of lance and abuts against the inner wall of oil pipe. The installation device includes built -in oil pipe inner wall occluder, locking rod and press -down assembly, the lance is arranged at the bottom end of locking rod, and the size of the working end of press -down assembly is adapted to the size of rubber core. The utility model has compact structure, wide adaptability, reduces the occupation of well site space, and is simple and easy to operate, high in installation efficiency, applicable to oilfield exploitation industry and used for assisting the installation of self -sealing packer rubber core.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield development equipment, specifically a built-in tubing inner wall clamp and a self-sealing well sealer rubber core installation device. Background Technology

[0002] Self-sealing wellhead sealers are important devices used in oilfield development to seal wellheads and control fluid overflow. Their core sealing component is a rubber core. The rubber core has good sealing properties and wear resistance, but its high hardness makes installation difficult.

[0003] Patent CN113027369B discloses an installation device for installing a self-sealing wellhead sealer core, including a fixing component, a locking component, and a connecting component. The locking component and the connecting component are separate structures and are connected in a detachable manner. In implementation, a tubing short section or tubing is fitted onto the outside of a connecting rod. One end of the connecting rod passes through the tubing short section or tubing and is secured to the connecting sleeve on the locking rod by a snap-fit ​​pin. The other end of the connecting rod has a limiting disc with a diameter larger than the outer diameter of the tubing end coupling, so that the limiting disc is engaged with the tubing end coupling, thereby connecting the installation device to the tubing.

[0004] However, when implementing the aforementioned patent, it is necessary to first pass the end of the connecting rod away from the limiting plate through the tubing or tubing sub, and then snap the locking pin on the connecting rod with the connecting sleeve on the locking rod. This split connection method undoubtedly increases the complexity of operation, and the long connecting rod makes the overall device extremely inconvenient to carry and transport, and also occupies a lot of well site space. In addition, the implementation of the aforementioned patent requires that the length of the connecting rod must be greater than the length of the tubing or tubing sub to ensure that the connecting rod completely passes through the tubing or tubing sub. In practice, the length of the tubing is about 10 meters. If the connecting rod is passed through the tubing, then the connecting rod needs to be made into an extra-long rod. Therefore, the method of passing the connecting rod through the tubing sub is often used, but this method requires the configuration of a corresponding tubing sub, which is costly. Utility Model Content

[0005] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a compact, widely adaptable, and easy-to-operate built-in tubing inner wall clamp and self-sealing wellhead sealer rubber core installation device, so as to improve the rubber core installation efficiency, reduce labor intensity, and lower construction costs.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a built-in oil pipe inner wall engagement device, including a spear rod and an engagement block. The diameter of the spear rod is adapted to the inner diameter of the oil pipe. An inclined groove is formed on the side wall of the spear rod, and the engagement block is slidably disposed in the groove. The depth of the groove gradually decreases from top to bottom. When the engagement block slides to the lower part of the groove, the farthest distance L1 between its outer wall and the central axis of the spear rod is greater than the farthest distance L2 between its outer wall and the central axis of the spear rod when the engagement block slides to the upper part of the groove. When the engagement block slides to the bottom of the groove, its outer wall protrudes from the outer circumference of the spear rod and abuts against the inner wall of the oil pipe.

[0007] As a limitation of this utility model: the outer contour of the biting block is provided with anti-slip teeth.

[0008] As another limitation of this utility model: a limiting member is provided at the position of the spear rod near the lower part of the slide groove to prevent the biting block from slipping off the lower part of the slide groove.

[0009] As a further limitation of this utility model: the limiting member includes a locking block, which is fixed to the spear rod near the lower part of the slide groove by fasteners.

[0010] This utility model also provides a self-sealing well sealer rubber core installation device, including a built-in tubing inner wall engagement device, a locking rod and a pressing component movably sleeved on the locking rod, wherein the spear is disposed at the bottom end of the locking rod, and the size of the working end of the pressing component is adapted to the size of the rubber core.

[0011] As a further limitation of this utility model: the pressing assembly includes an upper pressing plate, a lower pressing plate, and a plurality of support rods fixed between the upper pressing plate and the lower pressing plate. The upper pressing plate is movably sleeved on the locking rod, and the size of the lower pressing plate is adapted to the size of the rubber core.

[0012] As a further limitation of this utility model: the locking rod is provided with an external thread, the upper pressure plate is provided with a through hole, the size of the through hole is larger than the outer diameter of the locking rod; a connecting assembly is provided between the upper pressure plate and the locking rod, the connecting assembly includes a locking seat threadedly connected to the outer diameter of the locking rod, the locking seat abutting against the upper surface of the upper pressure plate.

[0013] As a further limitation of this utility model: the connecting assembly further includes a limiting sleeve, the limiting sleeve including a cylinder and a limiting ring fixedly connected, the cylinder being sleeved in the through hole, and the locking rod being movably sleeved in the cylinder; the outer diameter of the limiting ring is larger than the diameter of the through hole, and the locking seat abuts against the limiting ring; a limiting nut is threaded on the cylinder, and a locking space for locking the upper pressure plate is formed between the limiting nut and the limiting ring.

[0014] As a further limitation of this utility model: the inner wall of the upper pressure plate is provided with a stepped groove and a thrust bearing disposed in the stepped groove; the outer wall of the cylinder contacts the inner ring of the thrust bearing; and a locking space is formed between the limiting nut and the limiting ring for locking the upper pressure plate and the thrust bearing.

[0015] As a further limitation of this utility model: the end of the locking rod away from the spear rod is threaded with a blind plug.

[0016] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows: This utility model provides a built-in oil pipe inner wall clamping device, including a spear rod and a clamping block. The clamping block is slidably disposed in an inclined groove of the spear rod. When the clamping block slides to the lower part of the groove, the farthest distance L1 between its outer wall and the central axis of the spear rod is greater than the farthest distance L2 between its outer wall and the central axis of the spear rod when the clamping block slides to the upper part of the groove. When the clamping block slides to the lower part of the groove, the sum of L1 and the radius of the spear rod is slightly greater than the inner diameter of the oil pipe. In use, the spear rod and the clamping block extend into the oil pipe. During the extension process, the clamping block is located at the upper part of the groove. After extension, the spear rod is pulled back and forth along the length of the oil pipe. During the pulling process, the position of the clamping block in the groove changes until the clamping block is tightly abutted against the inner wall of the oil pipe. At this time, the spear rod cannot be moved, thus completing the clamping and fixing of the spear rod and the oil pipe. This utility model also provides a self-sealing wellhead sealer rubber core installation device, including a locking rod and a pressing component movably sleeved on the locking rod, with a spear rod located at the bottom end of the locking rod. In use, the rubber core is first placed on the tubing end. Holding the locking rod, the spear rod is inserted into the tubing. Once the spear rod engages with the tubing, the pressing component is sleeved on the locking rod, causing the pressing plate in the pressing component to contact the rubber core. The pressing component is then driven to move towards the tubing. At this time, the pressing plate acts on the rubber core and pushes it towards the tubing until it is finally sleeved on the tubing. After the rubber core is installed, the device is removed. Then, the end of the locking rod furthest from the tubing is tapped along the length of the tubing. During the tapping, the locking rod moves into the tubing, causing relative movement between the locking rod and the engaging block. At this point, the engaging block is positioned above the groove, causing it to no longer engage with the inner wall of the tubing. The locking rod can then be pulled out, completing the installation of one rubber core. This invention achieves a snap-fit ​​fixation with the inner wall of the tubing using a spear rod and a locking block. The spear rod only needs to be long enough to extend into the tubing, thus it is compatible with both tubing and tubing sections, offering wide applicability. Compared to existing technologies where the connecting rod completely passes through the tubing for fixation, this invention effectively reduces the spear rod length, resulting in a compact overall structure that is easy to transport and occupies less space at the well site. Furthermore, it is simple to operate, has high installation efficiency, and low construction costs.

[0017] In summary, this utility model has a compact structure, low cost, wide adaptability, and reduces the space occupied at the well site; it is also easy to operate and has high installation efficiency. This utility model is applicable to the oilfield development industry and is used to assist in the installation of self-sealing well sealer rubber cores. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model; Figure 2 This is a schematic diagram of the main structure of Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the main structure of Embodiment 1 of this utility model when the interlocking block is located at the upper part of the slide groove; Figure 4 This is a three-dimensional structural diagram of Embodiment 2 of the present invention; Figure 5 This is an exploded view of Embodiment 2 of the present invention; Figure 6 This is a three-dimensional structural diagram of the upper pressure plate, through hole, and stepped groove in Embodiment 2 of this utility model; Figure 7 This is a three-dimensional structural diagram of the upper pressure plate, cylinder, and limiting nut in Embodiment 2 of this utility model; Figure 8 This is a front view of the application structure of Embodiment 2 of this utility model before it extends into the oil pipe; Figure 9 This is a front view of the application structure of Embodiment 2 of this utility model after it is inserted into the oil pipe.

[0020] In the diagram: 1-Spear rod, 101-Spear rod central shaft, 2-Clamping block, 3-Frustum, 4-Slide groove, 5-Guide plane, 6-Slide rail, 7-Anti-slip teeth, 8-Locking block, 9-Screw, 10-Locking rod, 11-Lower pressing assembly, 12-Upper pressure plate, 121-Through hole, 122-Stepped groove, 13-Lower pressure plate, 14-Support rod, 15-Limit sleeve, 151-Cylinder, 152-Limit ring, 16-Limit nut, 17-Locking seat, 18-Thrust bearing, 19-Blind plug, 20-Oil pipe. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and do not constitute a limitation thereof.

[0022] The directional terms or positional relationships such as "upper" and "lower" used in the embodiments are based on the drawings in this utility model specification. Figure 8The orientation relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model.

[0023] Example 1: Built-in tubing inner wall engagement device like Figures 1-3 As shown, this embodiment includes a spear 1 and a biting block 2. The spear 1 is a cylindrical rod with a frustum 3 at its bottom end, with the smaller diameter end of the frustum 3 facing downwards. The diameter of the spear 1 is adapted to the inner diameter of the oil pipe 20. Here, "adapted" means that the diameter of the spear 1 is smaller than the inner diameter of the oil pipe 20, so that the spear 1 and the biting block 2 can extend into the oil pipe 20 together.

[0024] The engagement block 2 is slidably connected to the spear shaft 1. Specifically, an inclined groove 4 is provided on the side wall of the spear shaft 1. The depth of the groove 4 gradually decreases from top to bottom. Here, the depth refers to the radial distance along the spear shaft 1. That is, the bottom of the groove 4 is closer to the central axis 101 of the spear shaft at the upper part, and farther away from the central axis 101 of the spear shaft at the lower part. The bottom of the groove 4 forms an inclined guide plane 5. The engagement block 2 is slidably disposed in the groove 4. Specifically, a slide rail 6 is provided on the guide plane 5. A corresponding groove is machined on the inner side of the engagement block 2 (i.e., the side in contact with the spear shaft 1). The shape of the groove is adapted to the slide rail 6, allowing the engagement block 2 to "ride" and be engaged on the slide rail 6 through the groove on its inner side, ensuring that the engagement block 2 can slide along the slide rail 6.

[0025] like Figure 2 , 3 As described above, when the biting block 2 slides to the lower part of the slide groove 4, the farthest distance L1 between its outer wall and the central axis 101 of the spear rod is greater than the farthest distance L2 between the outer wall of the biting block 2 and the central axis 101 of the spear rod when the biting block 2 slides to the upper part of the slide groove 4. Because the guide plane 5 is inclined, when the biting block 2 slides downward along the slide rail 6 (i.e. towards the lower end of the slide groove 4), the inner surface of the biting block 2 will be constrained and pushed by the gradually rising bottom of the groove, causing the biting block 2 to produce a radial outward displacement relative to the central axis 101 of the spear rod. When the biting block 2 slides to the lowermost part of the slide groove 4, its radial outward displacement reaches its maximum value. At this time, the outer wall of the biting block 2 protrudes to the maximum extent from the outer circumferential surface of the spear rod 1, and the sum of L1 and the radius of the spear rod 1 is slightly greater than the inner radius of the oil pipe 20, so that the biting block 2 and the inner wall of the oil pipe 20 can produce effective and reliable contact and engagement.

[0026] The outer contour of the biting block 2 is machined with anti-slip teeth 7, the teeth being sawtooth or wavy, which are used to increase the friction with the inner wall of the oil pipe 20 to achieve a tight gripping and fixing.

[0027] The spear shaft 1 is provided with a limiting member near the lower part of the slide groove 4 to prevent the engaging block 2 from slipping off the lower part of the slide groove 4. For example... Figure 1 , 2 As shown, in this embodiment, the limiting component includes a locking block 8, which is fixed to the lower part of the spear rod 1 near the slide groove 4 by fasteners, specifically screws 9. When the engaging block 2 moves down to abut against the locking block 8, it can no longer slide downwards.

[0028] This embodiment is compatible with both oil pipe 20 and oil pipe short sections. In use, the spear rod 1 is inserted into the oil pipe 20, with the engaging block 2 positioned above the sliding groove 4 during insertion. After insertion, the spear rod 1 is pulled back and forth along the length of the oil pipe 20 (i.e., the up-and-down direction). During this pulling process, the position of the engaging block 2 within the sliding groove 4 changes until the engaging block 2 is tightly abutted against the inner wall of the oil pipe 20. At this point, the spear rod 1 cannot move, completing the locking and fixing of the spear rod 1 to the oil pipe 20. It should be noted that during on-site operation, the oil pipe 20 should be laid flat on the ground, not upright. See [reference needed]. Figure 8 The spear shaft 1 needs to extend horizontally into the oil pipe 20. The terms "up" and "down" mentioned in this embodiment only represent... Figure 8 The location is marked in the middle. When it is necessary to remove the spear rod 1, apply a force to the spear rod 1 along the length of the oil pipe 20 (i.e., Figure 9 (Force in the direction of the middle arrow). At this time, the spear shaft 1 will move downward, and the biting block 2 will move upward relative to the spear shaft 1. This is equivalent to the biting block 2 moving towards the upper part of the slide groove 4, causing its outer wall to retract to a position that is close to or further inward to the outer surface of the spear shaft 1. See [link / reference] Figure 3 This releases the engagement between the locking block 2 and the inner wall of the oil pipe 20, making it easier to remove from the oil pipe 20.

[0029] Example 2: Self-sealing well sealer core installation device like Figure 4-9 As shown, this embodiment includes the built-in tubing inner wall engagement device of Embodiment 1, and also includes a locking rod 10 and a pressing component 11 movably sleeved on the locking rod 10. Here, "movably sleeved" means that the pressing component 11 can move axially along the locking rod 10. The spear 1 is disposed at the bottom end of the locking rod 10, and in this embodiment, the spear 1 is threadedly connected to the bottom end of the locking rod 10. The size of the working end of the pressing component 11 is adapted to the size of the rubber core. Here, "adapted" means that the working end of the pressing component 11 can contact the rubber core, and can push the rubber core downward when the pressing component 11 moves downward.

[0030] The pressing assembly 11 includes an upper pressing plate 12, a lower pressing plate 13, and several support rods 14 fixed between the upper pressing plate 12 and the lower pressing plate 13. The support rods 14 are welded to the upper pressing plate 12 and to the lower pressing plate 13. The upper pressing plate 12 is movably sleeved on the locking rod 10. The lower pressing plate 13 is the working end of the pressing assembly 11. The size of the lower pressing plate 13 is adapted to the size of the rubber core. The lower pressing plate 13 has a circular ring structure; this adaptation means that the inner diameter of the lower pressing plate 13 is smaller than the outer diameter of the rubber core, ensuring that the lower pressing plate 13 can act on the rubber core.

[0031] The upper pressure plate 12 and the locking rod 10 are movably sleeved in the following manner: Figure 4-6 As shown, the locking rod 10 is machined with external threads, and the upper pressure plate 12 is provided with a through hole 121. The size of the through hole 121 is larger than the outer diameter of the locking rod 10 (slightly larger), ensuring that the upper pressure plate 12 can be fitted onto the locking rod 10 and can move axially along the locking rod 10. A connecting component is provided between the upper pressure plate 12 and the locking rod 10, such as... Figure 4 As shown, the connecting assembly includes a locking seat 17 threaded onto the outer diameter of the locking rod 10. The locking seat 17 is a nut, and it abuts against the upper surface of the upper pressure plate 12 to transmit downward pressure. Of course, the movable sleeve arrangement of the upper pressure plate 12 and the locking rod 10 can also be replaced with any existing structure. For example, the locking rod 10 may not have external threads; instead, the upper pressure plate 12 and the locking rod 10 can be slidably connected via a guide rail assembly, allowing the upper pressure plate 12 to move axially along the locking rod 10. Then, an existing drive mechanism (such as a cylinder) can be used to drive the upper pressure plate 12 to move.

[0032] Furthermore, such as Figure 4 , 5 As shown, the connecting assembly also includes a limiting sleeve 15, which includes a fixedly connected cylinder 151 and a limiting ring 152. In this embodiment, the cylinder 151 and the limiting ring 152 are integrally formed. The cylinder 151 is sleeved inside the through hole 121, and the locking rod 10 is movably sleeved inside the cylinder 151. The outer diameter of the limiting ring 152 is larger than the diameter of the through hole 121, and the locking seat 17 abuts against the limiting ring 152. A limiting nut 16 is threaded onto the end of the cylinder 151 away from the limiting ring 152, and a locking space is formed between the limiting nut 16 and the limiting ring 152 for locking the upper pressure plate 12. When the locking seat 17 is turned, under the threaded engagement, the locking seat 17 moves downward along the axial direction of the locking rod 10, thereby pushing the limiting sleeve 15 and the pressing assembly 11 downward. It should be noted that the effective length of the external thread on the locking rod 10 should be greater than the moving length of the locking seat 17 when the lower pressure assembly 11 pushes the rubber core into place; the length between the upper pressure plate 12 and the lower pressure plate 13 should be greater than the moving distance of the rubber core on the oil pipe 20.

[0033] To reduce rotational resistance, such as Figure 4-6 As shown, a stepped groove 122 is provided on the inner wall of the upper pressure plate 12, and a thrust bearing 18 is installed in the stepped groove 122. The outer wall of the cylinder 151 contacts the inner ring of the thrust bearing 18, and a locking space is formed between the limiting nut 16 and the limiting ring 152 for locking the upper pressure plate 12 and the thrust bearing 18. In other words, when the limiting nut 16 is tightened, the limiting ring 152 abuts against the thrust bearing 18 to prevent the thrust bearing 18 from disengaging from the stepped groove 122.

[0034] To improve this embodiment, such as Figure 4 As shown, the end of the locking rod 10 away from the spear rod 1 is threaded with a blind plug 19.

[0035] Working principle of this embodiment: First, place the rubber core onto the upper end of the oil pipe 20. Holding the locking rod 10, insert the spear rod 1 and the engaging block 2 into the oil pipe 20. At this time, the engaging block 2 is located at the upper part of the sliding groove 4. After insertion, pull the locking rod 10 back and forth along the length direction of the oil pipe 20 (i.e., the up and down direction). The engaging block 2 slides to the lower part in the sliding groove 4 and tightly abuts against the inner wall of the oil pipe 20 to achieve fixation.

[0036] Next, the pressing assembly 11 is fitted onto the locking rod 10, so that the pressing plate 13 contacts the rubber core. The locking seat 17 is rotated to push the pressing assembly 11 downward, and the pressing plate 13 presses the rubber core into the upper port of the oil pipe 20 until it is finally fitted onto the oil pipe 20.

[0037] Finally, remove this embodiment. First, twist the locking seat 17 in the reverse direction so that there is a gap of more than 5cm between the locking seat 17 and the limiting ring 152. At this time, along... Figure 9 Tap the blind plug 19 end of the locking rod 10 in the direction of the middle arrow to return the engagement block 2 to the upper part of the slide groove 4, disengage the engagement, and then remove it.

[0038] This invention achieves a snap-fit ​​fixation with the inner wall of the tubing 20 using a spear rod 1 and a snap-fit ​​block 2. The length of the spear rod 1 only needs to be able to extend into the tubing 20, thus it is compatible with both the tubing 20 and tubing sections, offering wide compatibility. Compared to the prior art where the connecting rod completely passes through the tubing 20 for fixation, this invention effectively reduces the overall length of the device, resulting in a compact structure, easy transport, and reduced space occupation at the well site. Furthermore, it is simple to operate, has high installation efficiency, and low construction costs.

[0039] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A built-in oil pipe inner wall engagement device, characterized in that, The device includes a spear shaft and a locking block. The diameter of the spear shaft is adapted to the inner diameter of the oil pipe. An inclined groove is formed on the side wall of the spear shaft, and the locking block is slidably disposed in the groove. The depth of the groove gradually decreases from top to bottom. When the locking block slides to the lower part of the groove, the farthest distance L1 between its outer wall and the central axis of the spear shaft is greater than the farthest distance L2 between its outer wall and the central axis of the spear shaft when the locking block slides to the upper part of the groove. When the locking block slides to the bottom of the groove, its outer wall protrudes from the outer circumference of the spear shaft and abuts against the inner wall of the oil pipe.

2. The built-in tubing inner wall engagement device according to claim 1, characterized in that, The outer contour of the bite block is provided with anti-slip teeth.

3. The built-in tubing inner wall engagement device according to claim 1 or 2, characterized in that, The spear shaft is provided with a limiting member near the lower part of the slide groove to prevent the biting block from slipping off the lower part of the slide groove.

4. The built-in tubing inner wall engagement device according to claim 3, characterized in that, The limiting component includes a locking block, which is fixed to the spear rod near the lower part of the slide groove by fasteners.

5. A self-sealing well sealer core installation device, characterized in that, The built-in tubing inner wall engagement device according to any one of claims 1 to 4 further includes a locking rod and a pressing assembly movably sleeved on the locking rod, wherein the spear is disposed at the bottom end of the locking rod, and the size of the working end of the pressing assembly is adapted to the size of the rubber core.

6. The self-sealing well sealer core installation device according to claim 5, characterized in that, The pressing assembly includes an upper pressing plate, a lower pressing plate, and several support rods fixed between the upper pressing plate and the lower pressing plate. The upper pressing plate is movably sleeved on the locking rod, and the size of the lower pressing plate is adapted to the size of the rubber core.

7. The self-sealing well sealer core installation device according to claim 6, characterized in that, The locking rod is provided with an external thread, and the upper pressure plate is provided with a through hole, the size of which is larger than the outer diameter of the locking rod; a connecting assembly is provided between the upper pressure plate and the locking rod, the connecting assembly including a locking seat threadedly connected to the outer diameter of the locking rod, the locking seat abutting against the upper surface of the upper pressure plate.

8. The self-sealing well sealer core installation device according to claim 7, characterized in that, The connecting assembly further includes a limiting sleeve, which comprises a fixedly connected cylinder and a limiting ring. The cylinder is fitted into the through hole, and the locking rod is movably fitted into the cylinder. The outer diameter of the limiting ring is larger than the diameter of the through hole, and the locking seat abuts against the limiting ring. A limiting nut is threaded onto the cylinder, and a locking space is formed between the limiting nut and the limiting ring for locking the upper pressure plate.

9. The self-sealing well sealer core installation device according to claim 8, characterized in that, The inner wall of the upper pressure plate is provided with a stepped groove and a thrust bearing disposed in the stepped groove. The outer wall of the cylinder contacts the inner ring of the thrust bearing. A locking space is formed between the limiting nut and the limiting ring for locking the upper pressure plate and the thrust bearing.

10. The self-sealing wellhead sealer core installation device according to any one of claims 5-9, characterized in that, The locking rod has a blind plug threaded to the end furthest from the spear.

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