A double-sealed tubing hanger

Abstract

This utility model relates to a double-sealed tubing hanger, belonging to the technical field of tubing hangers. It includes a tubing hanger body comprising a first base, a second base, a first flange, and a second flange. Both the first and second flanges have external sealing structures, and the external sealing structures are equipped with a transmission structure for operation. This double-sealed tubing hanger uses a rotating disk to drive a gear, which in turn moves a rack, pushing a piston plate along the piston cylinder. This forces gas into an annular air bladder, causing it to expand and adhere to the flange connection surface, achieving dynamic sealing adjustment. Two symmetrically distributed sealing structures provide double sealing, reducing the risk of single-point failure. A return spring, in conjunction with a transmission plate, pulls the piston plate back to its original position. A limiting block restricts the rack's trajectory, and a contact spring drives the limiting teeth to engage with a ratchet, preventing the rotating shaft from rotating and ensuring stable sealing.

Description

Technical Field

[0001] This utility model relates to the field of tubing hanger technology, specifically a double-sealed tubing hanger. Background Technology

[0002] The tubing hanger is a key component of oil wellhead equipment, primarily used to suspend the tubing string and seal the annular space between the tubing and casing. Its sealing performance directly affects the safety of wellhead operations and the efficiency of oil and gas extraction. During oil and gas extraction, the wellhead environment is complex, often facing the effects of high pressure, high temperature, and corrosive media, placing extremely high demands on the sealing performance of the tubing hanger.

[0003] Existing tubing hangers mostly use rubber seals, which makes it difficult to dynamically adjust the sealing pressure according to changes in operating conditions. During long-term use, seal failure can easily occur due to wear, aging, or deformation under stress, leading to oil and gas leakage. Therefore, a double-sealed tubing hanger is proposed to solve the aforementioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a double-sealed oil pipe hanger, which has advantages such as good sealing effect and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A double-sealed tubing hanger includes a tubing hanger body, the tubing hanger body including a first seat, a second seat, a first flange and a second flange, both the first flange and the second flange are provided with a sealing structure on the outside, and a transmission structure for operation drive is provided on the outside of the sealing structure.

[0007] The sealing structure includes an annular airbag fixedly connected to the outside of the first flange and a piston cylinder disposed outside the first seat. A piston plate is slidably connected inside the piston cylinder, and a piston rod extending to the outside of the piston cylinder is fixedly connected to one side of the piston plate. An air supply pipe is fixedly connected between the piston cylinder and the annular airbag.

[0008] The transmission structure includes a mounting bracket fixedly connected to the outside of the first and second seats. A rotating shaft is rotatably connected inside the mounting bracket. A gear is fixedly connected to one end of the rotating shaft. Two toothed rods are meshed with the outside of the gear. One end of the toothed rods is fixedly connected to the outside of the piston cylinder. A rotating disk is fixedly connected to the end of the rotating shaft away from the gear.

[0009] Furthermore, a transmission plate is fixedly connected to the end of the piston rod away from the piston plate, and the transmission plate abuts against the inner wall of the mounting bracket.

[0010] Furthermore, a return spring is fixedly connected between the transmission plate and the piston cylinder, and the return spring is connected to the outside of the piston rod.

[0011] Furthermore, the first seat is fixedly connected to the top of the second seat, and the first flange and the second flange are respectively fixedly connected to opposite ends of the first seat and the second seat.

[0012] Furthermore, the number of sealing structures is two sets, and the two sets of sealing structures are symmetrically distributed vertically on the outside of the first flange and the second flange.

[0013] Furthermore, a limiting block is fixedly connected to the inner side of the mounting bracket, and there are two limiting blocks, with both of the toothed rods slidably connected inside the limiting block.

[0014] Furthermore, the mounting bracket is provided with a limiting structure inside. The limiting structure includes an adjustment knob rotatably connected inside the mounting bracket and extending to its outside, and a ratchet fixedly connected to the outside of the rotating shaft. One end of the adjustment knob is fixedly connected with a limiting tooth that meshes with the outside of the ratchet.

[0015] Furthermore, a mounting block is fixedly connected to the inner wall of the mounting bracket, and an abutment spring is fixedly connected between the mounting block and the limiting tooth.

[0016] Compared with the prior art, this utility model provides a double-sealed oil pipe hanger, which has the following beneficial effects:

[0017] 1. This double-sealed tubing hanger rotates by rotating a rotating disc, which drives a rotating shaft to rotate. The rotating shaft drives a gear to mesh with two racks, which move synchronously in opposite directions and contact the mounting bracket. The racks push the piston plate inside the piston cylinder to slide along the cylinder wall, pressing gas into the annular air bladder through the gas delivery pipe. This causes the annular air bladder to expand and fit against the connection surface of the first and second flanges, precisely adjusting the inflation volume and expansion degree of the annular air bladder. This dynamically adapts to working conditions such as high pressure at the wellhead and fluctuations in the medium, avoiding leakage caused by insufficient sealing pressure or damage to the seals caused by pressure overload.

[0018] 2. This double-sealed tubing hanger achieves double sealing by setting two sets of sealing structures symmetrically distributed outside the flange and linking them through the transmission structure, reducing the risk of single-point failure. In addition, the return spring outside the piston rod works in conjunction with the transmission plate to pull the piston plate back to its original position. Furthermore, the annular airbag flexible seal can adapt to flange surface deformation, reduce sealing failure, and extend service life.

[0019] 3. This double-sealed tubing hanger restricts the trajectory of the rack and pinion through a limit block to prevent transmission jamming. The limit spring drives the limit teeth to mesh with the ratchet to limit the rotation shaft angle, preventing wellhead vibration from causing it to rotate, avoiding abnormal pressure in the annular airbag, and ensuring a stable seal. Attached Figure Description

[0020] Figure 1 This is a perspective view of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the transmission structure and the limiting structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the sealing structure of this utility model.

[0023] In the diagram: 1. Oil pipe hanger body; 11. First seat; 12. Second seat; 13. First flange; 14. Second flange; 2. Sealing structure; 21. Annular airbag; 22. Piston cylinder; 23. Piston plate; 24. Piston rod; 25. Transmission plate; 26. Return spring; 27. Air supply pipe; 3. Transmission structure; 31. Mounting bracket; 32. Limiting block; 33. Rotating shaft; 34. Gear; 35. Gear rack; 36. Rotating disk; 4. Limiting structure; 41. Adjusting knob; 42. Limiting tooth; 43. Mounting block; 44. Abutment spring; 45. Ratchet. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1 to 3 This embodiment of a double-sealed tubing hanger includes a tubing hanger body 1. The tubing hanger body 1 includes a first seat 11, a second seat 12, a first flange 13, and a second flange 14. Both the first flange 13 and the second flange 14 are provided with a sealing structure 2 on their exteriors. The sealing structure 2 is provided with a transmission structure 3 for operation drive on its exterior. The first seat 11 is fixedly connected to the top end of the second seat 12, and the first flange 13 and the second flange 14 are respectively fixedly connected to the opposite ends of the first seat 11 and the second seat 12.

[0026] Among them, the sealing structure 2 includes an annular airbag 21 fixedly connected to the outside of the first flange 13 and a piston cylinder 22 arranged outside the first seat body 11. A piston plate 23 is slidably connected inside the piston cylinder 22. One side of the piston plate 23 is fixedly connected to a piston rod 24 extending outside the piston cylinder 22. An air delivery pipe 27 is fixedly connected and communicated between the piston cylinder 22 and the annular airbag 21. By setting the transmission cooperation of the piston cylinder 22, the piston plate 23 and the piston rod 24, the annular airbag 21 can be actively inflated to realize the dynamic adjustment of the sealing pressure, which can effectively adapt to complex working conditions such as high wellhead pressure and medium fluctuation, and solves the problem of easy failure of static sealing.

[0027] Specifically, one end of the piston rod 24 far from the piston plate 23 is fixedly connected to a transmission plate 25, and the transmission plate 25 abuts against the inner wall of the mounting frame 31. By setting the transmission plate 25, the contact area between the piston rod 24 and the mounting frame 31 is increased, so that the thrust of the rack 35 can be transmitted to the piston rod 24 more smoothly and evenly, avoiding the bending of the piston rod 24 or the skew of the piston plate 23 caused by single-point stress, ensuring the smoothness and stability of the air injection process, and improving the accuracy of sealing pressure control.

[0028] It should be noted that a return spring 26 is fixedly connected between the transmission plate 25 and the piston cylinder 22, and the return spring 26 is connected around the outside of the piston rod 24.

[0029] In addition, the number of the sealing structures 2 is two groups, and the two groups of sealing structures 2 are symmetrically distributed up and down in sequence outside the first flange 13 and the second flange 14. By setting two groups of sealing structures 2 that are symmetrically distributed up and down, a double redundant seal is formed to simultaneously protect the upper and lower two key connection ends of the tubing hanger. Even if one group of annular airbags 21 has a sealing flaw due to wear or aging, the other group can still maintain the sealing effect, greatly reducing the risk of oil and gas leakage caused by single-point failure, and significantly improving the reliability of the overall seal.

[0030] In this embodiment, the transmission structure 3 includes a mounting frame 31 fixedly connected to the outside of the first seat body 11 and the second seat body 12. A rotating shaft 33 is rotatably connected inside the mounting frame 31. One end of the rotating shaft 33 is fixedly connected to a gear 34. Two racks 35 are meshed and connected to the outside of the gear 34. One end of each rack 35 is fixedly connected to the outside of the piston cylinder 22. The end of the rotating shaft 33 far from the gear 34 is fixedly connected to a rotating disk 36. By driving the gear 34 to rotate through the rotating disk 36 and the rotating shaft 33, the two racks 35 are synchronously moved in opposite directions, realizing the linkage control of the upper and lower two groups of sealing structures 2. The displacement of the piston plate 23 can be accurately controlled by controlling the rotation angle of the rotating disk 36, so as to accurately adjust the inflation pressure of the annular airbag 21.

[0031] Among them, the inner side of the mounting bracket 31 is fixedly connected to the limiting block 32, and there are two limiting blocks 32. Both toothed rods 35 are slidably connected inside the limiting block 32.

[0032] In this embodiment, a limiting structure 4 is provided inside the mounting frame 31. The limiting structure 4 includes an adjustment knob 41 rotatably connected inside the mounting frame 31 and extending to its outside, and a ratchet 45 fixedly connected to the outside of the rotating shaft 33. One end of the adjustment knob 41 is fixedly connected to a limiting tooth 42 that meshes with the outside of the ratchet 45. By setting up a one-way limiting mechanism composed of the ratchet 45 and the limiting tooth 42, the position of the rotating shaft 33 can be firmly locked after the sealing pressure is adjusted, using the one-way rotation characteristic of the ratchet 45, preventing it from rotating due to external interference such as wellhead vibration.

[0033] A mounting block 43 is fixedly connected to the inner wall of the mounting bracket 31, and an abutment spring 44 is fixedly connected between the mounting block 43 and the limiting tooth 42. The abutment spring 44 continuously applies elastic pressure to the limiting tooth 42, ensuring it remains tightly fitted to the tooth groove of the ratchet 45, thus guaranteeing reliable limiting action and preventing the limiting tooth 42 from disengaging from the ratchet 45 due to vibration. Furthermore, when active adjustment of the sealing pressure is required, simply rotating the adjustment knob 41 overcomes the spring force, disengaging the limiting tooth 42 from the ratchet 45. This flexible operation does not affect the overall stability of the limiting function.

[0034] The working principle of the above embodiments is as follows:

[0035] In use, first connect the first seat 11 and the second seat 12 of the oil pipe hanger body 1 to the external pipeline through the first flange 13 and the second flange 14. Rotate the rotating disk 36 of the transmission structure 3 to drive the rotating shaft 33 and the gear 34 to rotate. The gear 34 meshes with two racks 35 and moves synchronously in opposite directions under the guidance of the limit block 32. The racks 35 push the transmission plate 25 of the sealing structure 2 and the mounting bracket 31 to abut against each other, so that the piston rod 24 drives the piston plate 23 to slide in the piston cylinder 22, and compresses the gas through the gas delivery pipe 27. The annular airbag 21 is inserted, causing it to expand and fit against the sealing surfaces of the first flange 13 and the second flange 14. The spring force of the abutment spring 44 pushes the limiting tooth 42 to engage with the ratchet 45, locking the position of the rotating shaft 33 and maintaining the pressure stability of the annular airbag 21. When pressure relief or adjustment is required, the adjusting knob 41 is rotated to disengage the limiting tooth 42 from the ratchet 45. The return spring 26 pulls the transmission plate 25 and the piston plate 23 back to their original positions, releasing the gas inside the annular airbag 21. The two sets of symmetrical sealing structures 2 operate synchronously, achieving double sealing at the upper and lower connecting ends.

[0036] It should be noted that the orientations or positional relationships indicated herein are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of facilitating the description of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-sealed tubing hanger, characterized in that: The system includes a tubing hanger body (1), which includes a first seat (11), a second seat (12), a first flange (13), and a second flange (14). Both the first flange (13) and the second flange (14) are provided with a sealing structure (2), and the sealing structure (2) is provided with a transmission structure (3) for operation drive. The sealing structure (2) includes an annular airbag (21) fixedly connected to the outside of the first flange (13) and a piston cylinder (22) disposed outside the first seat (11). A piston plate (23) is slidably connected inside the piston cylinder (22). A piston rod (24) extending to the outside of the piston cylinder (22) is fixedly connected to one side of the piston plate (23). An air supply pipe (27) is fixedly connected between the piston cylinder (22) and the annular airbag (21). The transmission structure (3) includes a mounting bracket (31) fixedly connected to the outside of the first seat (11) and the second seat (12). A rotating shaft (33) is rotatably connected inside the mounting bracket (31). A gear (34) is fixedly connected to one end of the rotating shaft (33). Two racks (35) are meshed with the outside of the gear (34). One end of the rack (35) is fixedly connected to the outside of the piston cylinder (22). A rotating disk (36) is fixedly connected to the end of the rotating shaft (33) away from the gear (34).

2. The double-sealed tubing hanger according to claim 1, characterized in that: The piston rod (24) is fixedly connected to a transmission plate (25) at the end away from the piston plate (23), and the transmission plate (25) abuts against the inner wall of the mounting bracket (31).

3. A double-sealed tubing hanger according to claim 2, characterized in that: A return spring (26) is fixedly connected between the transmission plate (25) and the piston cylinder (22), and the return spring (26) is connected around the outside of the piston rod (24).

4. A double-sealed tubing hanger according to claim 1, characterized in that: The first seat (11) is fixedly connected to the top of the second seat (12), and the first flange (13) and the second flange (14) are respectively fixedly connected to the opposite ends of the first seat (11) and the second seat (12).

5. A double-sealed tubing hanger according to claim 1, characterized in that: The number of sealing structures (2) is two sets, and the two sets of sealing structures (2) are symmetrically distributed on the outside of the first flange (13) and the second flange (14) in sequence.

6. A double-sealed tubing hanger according to claim 1, characterized in that: The mounting bracket (31) is fixedly connected to a limiting block (32) on its inner side. There are two limiting blocks (32), and the two toothed rods (35) are slidably connected inside the limiting block (32).

7. A double-sealed tubing hanger according to claim 1, characterized in that: The mounting bracket (31) is provided with a limiting structure (4) inside. The limiting structure (4) includes an adjustment knob (41) rotatably connected inside the mounting bracket (31) and extending to its outside, and a ratchet (45) fixedly connected to the outside of the rotating shaft (33). One end of the adjustment knob (41) is fixedly connected with a limiting tooth (42) that meshes with the outside of the ratchet (45).

8. A double-sealed tubing hanger according to claim 7, characterized in that: An mounting block (43) is fixedly connected to the inner wall of the mounting bracket (31), and an abutment spring (44) is fixedly connected between the mounting block (43) and the limiting tooth (42).

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