Sealing hanger, casing head and using method of sealing hanger

Abstract

The invention discloses a sealing hanger, a casing head and a using method of the sealing hanger, and relates to the technical field of casing sealing, in particular to the sealing hanger comprising a metal sealing assembly which is arranged between the adjacent end faces of a sealing sleeve body and a pressing ring and comprises an inner conical ring and an outer conical ring which are made of metal materials, and the inner conical ring and the outer conical ring are coaxially sleeved; the contact ring face of the inner conical ring and the contact ring face of the outer conical ring are conical faces, sealing ring protrusions used for contact sealing are arranged on the non-contact ring face of the inner conical ring and the non-contact ring face of the outer conical ring, and the inner conical ring and the outer conical ring are partially overlapped in the axial direction. According to the sealing hanger, the casing head and the using method thereof, through cooperative use of the inner conical ring and the outer conical ring, the size of the metal sealing assembly is adjustable, active sealing is achieved, then the using cost is reduced, the using problem in a high-temperature and high-pressure scene is solved, secondary sealing is conducted in cooperation with the rubber sealing ring, and the using problem in a corrosive environment is solved.

Description

Technical Field

[0001] This invention relates to the field of sleeve sealing technology, and more specifically, to a sealing hanger. Furthermore, this invention also relates to a sleeve head including the aforementioned sealing hanger and a method of using the sleeve head. Background Technology

[0002] In oil drilling and completion processes, the casing head is an important device used for connecting different layers of casing, connecting the casing to the blowout preventer, and supporting and connecting it to the oil / gas wellhead after completion.

[0003] A sealing hanger is a component used to fix and seal the aforementioned sleeve head to the sleeve to be installed inside it.

[0004] In shale oil extraction, sealing hangers are required to maintain good sealing performance under harsh conditions of high temperature and high pressure to ensure the safety and efficiency of oil and gas extraction.

[0005] Currently, the sealing of suspension devices mainly relies on the contact of sealing rings. These sealing rings are divided into metal sealing rings and rubber sealing rings. Rubber sealing rings are passive seals, which improve sealing performance through their own deformation and have good corrosion resistance. However, their performance weakens at high temperatures, and their sealing performance becomes unstable. Metal sealing rings have better high-temperature resistance, but their corrosion resistance is weaker than that of rubber sealing rings. They also require precise matching of dimensions to ensure good contact between the sealing surfaces in order to guarantee their sealing performance, resulting in higher operating costs.

[0006] In summary, how to solve the sealing problem of existing sealing hangers and sleeve heads in high temperature, high pressure and corrosive environments is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a sealing hanger that, through the combined use of an inner conical ring and an outer conical ring, makes the size of the metal sealing component adjustable, achieves active sealing, thereby reducing the cost of use and solving the problem of use in high temperature and high pressure scenarios. In addition, it is used in conjunction with a rubber sealing ring for secondary sealing, solving the problem of use in corrosive environments.

[0008] Another object of the present invention is to provide a sleeve head including the above-mentioned sealing hanger, which has the same technical features, can solve the same technical problems, and achieve the same object.

[0009] Another objective of this invention is to provide a method for using the aforementioned sleeve head, which enables rapid installation of the sleeve head and solves the problem of using the sleeve head in high temperature, high pressure, and corrosive environments.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A sealing hanger, comprising:

[0012] The main body of the sealing sleeve is a ring structure, with a first rubber sealing ring and a second rubber sealing ring respectively provided on the inner ring surface and the outer ring surface;

[0013] The pressure ring is a ring structure and is connected to the sealing sleeve body by a clamping screw. The axis of the clamping screw is parallel to the center line of the pressure ring and the sealing sleeve body.

[0014] A metal sealing assembly, arranged between adjacent end faces of the sealing sleeve body and the pressure ring, includes an inner conical ring and an outer conical ring made of metal material, which are coaxially fitted together. The contact surfaces of the inner and outer conical rings are conical, and both the inner and outer conical rings have sealing ring protrusions for contact sealing on their non-contact surfaces. The inner and outer conical rings partially overlap along the axial direction. When the clamping screw is tightened, the distance between the sealing sleeve body and the pressure ring decreases, the overlap between the inner and outer conical rings increases, and the inner and outer conical rings deform due to mutual compression.

[0015] Preferably, the cross-section of the sealing sleeve body is T-shaped, and the inner and outer annular surfaces of the horizontal wall of the sealing sleeve body are respectively provided with annular grooves, and the first rubber sealing ring and the second rubber sealing ring are respectively disposed in the annular grooves of the inner and outer annular surfaces of the horizontal wall.

[0016] The inner and outer annular surfaces of the vertical wall of the sealing sleeve body are respectively provided with the metal sealing components. The inner annular surface of the vertical wall contacts and seals with the sealing ring protrusion of the outer conical ring on the corresponding side, and the outer annular surface of the vertical wall contacts and seals with the sealing ring protrusion of the inner conical ring on the corresponding side.

[0017] Preferably, the bottom surface of the pressure ring is provided with an annular groove, and the vertical wall of the sealing sleeve body is fitted into the annular groove;

[0018] The top of the vertical wall of the sealing sleeve body is provided with a threaded hole, and the bottom of the annular groove is provided with a through hole. The clamping screw passes through the through hole and is installed in conjunction with the threaded hole.

[0019] Preferably, the outer ring surface of the inner conical ring is an outer conical surface (6011), and two sets of inner sealing ring protrusions (6012) are respectively provided at the upper and lower ends of the inner ring surface, and the inner ring surface of the inner sealing ring protrusion (6012) is an arc-shaped surface.

[0020] Preferably, the inner ring surface of the outer conical ring is an inner conical surface (6021), and the inner conical surface (6021) and the outer conical surface (6011) abut and partially overlap; two sets of outer sealing ring protrusions (6022) are respectively provided at the upper and lower ends of the outer ring surface of the outer conical ring, and the outer ring surface of the outer sealing ring protrusion (6022) is an arc-shaped surface.

[0021] A sleeve head comprising the sealing hanger described in any one of the above.

[0022] Preferably, the sleeve head further includes a cylindrical housing, the inner wall of the housing is in contact with and sealed to the sealing ring protrusion adjacent thereto, and the inner wall of the housing is in contact with and sealed to the second rubber sealing ring;

[0023] The inner wall of the housing is provided with a limiting protrusion, which abuts against the end of the sealing sleeve body away from the pressure ring;

[0024] The housing is provided with a top point, which abuts against the end of the pressure ring away from the main body of the sealing sleeve.

[0025] Preferably, the housing has a threaded hole arranged radially inside, the tip is threadedly connected inside the threaded hole, and the contact surfaces of the tip and the pressure ring are both tapered surfaces.

[0026] A method of use, applied to the aforementioned sleeve head, the method of use comprising:

[0027] The metal sealing assembly is placed between the sealing sleeve body and the pressure ring, and the sealing sleeve body and the pressure ring are initially connected by the clamping screws to form the sealing hanger;

[0028] The suspension seal is fitted inside the housing, so that the second rubber sealing ring contacts and seals the inner wall of the housing, and the main body of the sealing sleeve abuts against the limiting protrusion.

[0029] Insert a sleeve from the end of the housing so that the outer wall of the sleeve contacts and seals the first rubber sealing ring;

[0030] Tighten the clamping screw to reduce the distance between the clamping ring and the sealing sleeve body, thereby increasing the axial overlap of the inner conical ring and the outer conical ring, and causing the sealing ring protrusions of the inner conical ring and the outer conical ring to contact and seal with the outer wall of the sleeve and the inner wall of the housing, respectively.

[0031] The tip is fitted into the housing so that it abuts against the pressure ring.

[0032] The sealing hanger provided by the present invention has at least the following advantages compared with the prior art:

[0033] 1. A rubber sealing ring is used for primary sealing to solve the problem of use in corrosive environments, isolate the corrosive medium from the metal sealing components, and prevent the metal sealing components from being corroded;

[0034] 2. A two-stage sealing system using metal sealing components is adopted to solve the problem of use under high temperature and high pressure. At the same time, it forms a two-stage seal together with the rubber sealing ring to improve the overall sealing performance.

[0035] 3. The metal sealing assembly employs a nested inner and outer conical ring design. By altering the overlap between the two rings, deformation occurs, increasing the normal pressure on the contact surface and consequently enhancing the sealing performance and static friction of the contact sealing surface.

[0036] 4. The potential energy stored after the inner and outer conical rings are compressed and deformed can ensure the equipment remains sealed for a long time during the slow release process, thereby improving the sealing reliability of the equipment.

[0037] The sleeve head provided by the present invention includes the aforementioned sealing hanger and has the same beneficial effects.

[0038] The method of use provided by this invention, applied to the above-mentioned sleeve head, can quickly complete the installation of the sleeve head and solve the problem of using the sleeve head in high temperature, high pressure and corrosive environments. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the specific sealing hanger provided by the present invention;

[0041] Figure 2 A schematic diagram of the specific metal sealing assembly provided by the present invention;

[0042] Figure 3 This is a schematic diagram of the specific sleeve head provided by the present invention;

[0043] Figure 4 This is a flowchart illustrating the specific usage method provided by the present invention.

[0044] Figures 1-3 middle:

[0045] 1. Sleeve; 2. First rubber sealing ring; 3. Sealing sleeve body; 4. Second rubber sealing ring; 5. Housing; 501. Limiting protrusion; 6. Metal sealing assembly; 601. Inner conical ring; 6011. Outer conical surface; 6012. Inner sealing ring protrusion; 602. Outer conical ring; 6021. Inner conical surface; 6022. Outer sealing ring protrusion; 7. Pressure ring; 8. Clamping screw; 9. Center. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] The core of this invention is to provide a sealing hanger that, through the combined use of an inner conical ring and an outer conical ring, makes the size of the metal sealing component adjustable, achieves active sealing, thereby reducing usage costs and solving usage problems in high temperature and high pressure scenarios. Furthermore, it is combined with a rubber sealing ring for secondary sealing, solving usage problems in corrosive environments.

[0048] Another core aspect of this invention is to provide a sleeve head that includes the aforementioned sealing hanger, possessing the same technical features, solving the same technical problems, and achieving the same objective.

[0049] Another core aspect of this invention is to provide a method for using the aforementioned sleeve head, which can quickly complete the installation of the sleeve head and solve the problem of using the sleeve head in high temperature, high pressure and corrosive environments.

[0050] Please refer to Figures 1-2 A sealing hanger, comprising:

[0051] The sealing sleeve body 3 is a ring structure, with a first rubber sealing ring 2 and a second rubber sealing ring 4 respectively provided on the inner ring surface and the outer ring surface;

[0052] The pressure ring 7 is an annular structure and is connected to the sealing sleeve body 3 by a clamping screw 8. The axis of the clamping screw 8 is parallel to the center line direction of the pressure ring 7 and the sealing sleeve body 3.

[0053] The metal sealing assembly 6 is arranged between the adjacent end faces of the sealing sleeve body 3 and the pressure ring 7, and includes an inner conical ring 601 and an outer conical ring 602 made of metal material, which are coaxially fitted together. The contact ring surfaces of the inner conical ring 601 and the outer conical ring 602 are conical, and the non-contact ring surfaces of the inner conical ring 601 and the outer conical ring 602 are provided with sealing ring protrusions for contact sealing. The inner conical ring 601 and the outer conical ring 602 partially overlap along the axial direction. When the clamping screw 8 is tightened, the distance between the sealing sleeve body 3 and the pressure ring 7 decreases, the overlap of the inner conical ring 601 and the outer conical ring 602 increases, and the inner conical ring 601 and the outer conical ring 602 are deformed by mutual compression.

[0054] In use, the metal sealing assembly 6 is positioned between the pressure ring 7 and the sealing sleeve body 3, with the inner conical ring 601 and outer conical ring 602 nested together and partially overlapping. After the pressure ring 7 and the sealing sleeve body 3 are connected by the clamping screw 8, further tightening of the clamping screw 8 reduces the gap between the pressure ring 7 and the sealing sleeve body 3, meaning that both ends of the metal sealing assembly 6 are compressed. This forces an increase in the axial overlap between the inner conical ring 601 and the outer conical ring 602, i.e., an increase in the overlap area between the inner conical surface 6021 and the outer conical surface 6011. This forces deformation of the inner conical ring 601 and the outer conical ring 602, i.e., a tendency for the inner conical ring 601 to undergo a reduction in inner diameter. The outer cone ring 602 exhibits a deformation trend with an increasing outer diameter. Combined with the sealing ring protrusions on the non-contact surfaces of the inner cone ring 601 and the outer cone ring 602, it deforms after being decompressed against its contact surface, thereby increasing the contact area and normal pressure of the contact surface and improving the sealing performance of the contact surface. At the same time, as the normal pressure increases, the static friction between the contact surfaces also increases, thereby improving the stability of the sealing hanger. Furthermore, the metal sealing component 6 generates a thermal expansion effect at high temperatures, further increasing the normal pressure and deformation of the contact surface, which further increases the static friction and sealing performance, thus improving the thermal stability of the sealing hanger.

[0055] Meanwhile, the inner cone ring 601 and the outer cone ring 602 are sealed by extrusion deformation. Both are preferably made of metal materials such as 304 stainless steel. After deformation, they can store a certain amount of deformation potential energy. This energy can be slowly released over a long period of time during operation, ensuring the sealing performance of the contact surface over a long period of time, thus improving the reliability of the seal.

[0056] Meanwhile, a first rubber sealing ring 2 and a second rubber sealing ring 4 are respectively set on the inner and outer ring surfaces of the sealing sleeve body 3 to perform a primary seal. Combined with the secondary seal of the metal sealing component 6, a two-stage seal is achieved. Through the two-stage seal, the durability of the sealing hanger is achieved in high temperature, high pressure and corrosive environments.

[0057] In a single sealing process, the first rubber sealing ring 2 is preferably an FS type sealing ring, and the second rubber sealing ring 4 is preferably an S type sealing ring. Both are made of rubber, which has good self-lubricating and corrosion resistance, making them suitable for use in corrosive environments with high salt and high alkali. They also isolate the corrosive medium from the metal sealing component 6, preventing the metal sealing component 6 from being corroded, thereby improving the overall durability.

[0058] like Figure 1 As shown, the cross-section of the sealing sleeve body 3 is T-shaped. The inner and outer annular surfaces of the horizontal wall of the sealing sleeve body 3 are respectively provided with annular grooves. The first rubber sealing ring 2 and the second rubber sealing ring 4 are respectively provided in the annular grooves of the inner and outer annular surfaces of the horizontal wall.

[0059] Metal sealing components 6 are respectively provided on the inner and outer annular surfaces of the vertical wall of the sealing sleeve body 3. The inner annular surface of the vertical wall contacts and seals with the sealing ring protrusion of the outer conical ring 602 on the corresponding side, and the outer annular surface of the vertical wall contacts and seals with the sealing ring protrusion of the inner conical ring 601 on the corresponding side.

[0060] The T-shaped cross-section of the sealing sleeve body 3 integrates two sets of metal sealing components 6, which facilitates the arrangement of the clamping screws 8 and the overall structural design. At the same time, it helps to reduce the wall thickness of the inner cone ring 601 and the outer cone ring 602, so that they can deform under the action of end compression, which is conducive to increasing the deformation of the sealing ring protrusion, increasing the contact area between the sealing ring protrusion and the contact surface and the sealing performance.

[0061] Meanwhile, the T-shaped cross-section design of the sealing sleeve body 3 helps to ensure the radial position limitation of the metal sealing component 6, ensure the coaxiality of the metal sealing component 6 and the sealing sleeve body 3, and thus help to ensure the overall sealing performance after assembly.

[0062] In some embodiments, the bottom surface of the pressure ring 7 is provided with an annular groove, and the vertical wall of the sealing sleeve body 3 is fitted into the annular groove.

[0063] The top of the vertical wall of the sealing sleeve body 3 is provided with a threaded hole, and the bottom of the annular groove is provided with a through hole. The clamping screw 8 passes through the through hole and is installed in conjunction with the threaded hole.

[0064] An annular groove is opened at the bottom of the pressure ring 7, and the vertical wall of the sealing sleeve body 3 is inserted into the annular groove. This facilitates the mutual positioning of the pressure ring 7 and the sealing sleeve body 3, ensures their coaxiality, and avoids the inner and outer annular surfaces of the pressure ring 7 from contacting the sealing surface, thereby affecting the contact sealing of the metal sealing assembly 6.

[0065] Meanwhile, the pressure ring 7 has a through hole through which the clamping screw 8 passes. That is, the action of clamping the pressure ring 7 can be achieved by tightening the clamping screw 8. By using a torque-setting tool to rotate the clamping screw 8 to a fixed torque, the deformation of the inner conical ring 601 and the outer conical ring 602 can be quantified.

[0066] In some embodiments, the outer ring surface of the inner conical ring 601 is an outer conical surface 6011, and two sets of inner sealing ring protrusions 6012 are respectively provided at the upper and lower ends of the inner ring surface, and the inner ring surface of the inner sealing ring protrusion 6012 is an arc-shaped surface.

[0067] The inner ring surface of the outer conical ring 602 is an inner conical surface 6021, and the inner conical surface 6021 and the outer conical surface 6011 abut and partially overlap; the upper and lower ends of the outer ring surface of the outer conical ring 602 are respectively provided with two sets of outer sealing ring protrusions 6022, and the outer ring surface of the outer sealing ring protrusions 6022 is an arc-shaped surface.

[0068] like Figure 2 As shown, the inner conical ring 601 and the outer conical ring 602, which are used for contact sealing, are each provided with four sets of sealing ring protrusions, arranged in a manner of two sets at the upper end and two sets at the lower end. By arranging the sealing ring protrusions, the processing difficulty of the sealing contact surface is effectively reduced, and the sealing performance is further improved through the double sealing at both ends. Moreover, the contact surface of the sealing ring protrusions all adopts an arc-shaped structure. When the inner conical ring 601 and the outer conical ring 602 are deformed by extrusion, the sealing ring protrusions also deform. As the deformation of the sealing ring protrusions increases, the contact surface of its arc-shaped structure deforms, and the contact area with the sealing surface gradually increases, thereby increasing its sealing performance.

[0069] In addition to the sealing hangers disclosed in the above embodiments, the present invention also provides a sleeve head including the above-described sealing hangers.

[0070] like Figure 3 As shown, the sleeve head also includes a cylindrical housing 5, the inner wall of the housing 5 is in contact with and sealed by a sealing ring protrusion near it, and the inner wall of the housing 5 is in contact with and sealed by a second rubber sealing ring 4.

[0071] The inner wall of the housing 5 is provided with a limiting protrusion 501, which abuts against the end of the sealing sleeve body 3 away from the pressure ring 7.

[0072] A tip 9 is provided inside the housing 5, and the tip 9 abuts against the end of the pressure ring 7 away from the sealing sleeve body 3;

[0073] The limiting protrusion 501 and the tip 9 limit the position of the housing 5 and the sealing hanger, thereby ensuring the relative position stability of the two during operation.

[0074] In some embodiments, a threaded hole is provided radially inside the housing 5, and the tip 9 is threadedly connected inside the threaded hole. The contact surfaces of both the tip 9 and the pressure ring 7 are tapered surfaces.

[0075] The tip 9 is connected to the housing 5 by a threaded connection, and the end is provided with a tapered surface. As the tip 9 is screwed in more, the pressure on the pressure ring 7 at its end increases, which facilitates the assembly and fixing of the sealing hanger and helps to apply pre-tightening force to the hanging seal, ensuring its stability during use.

[0076] In addition to the sealing hanger and sleeve head disclosed in the above embodiments, the present invention also provides a method of using the above sleeve head.

[0077] The usage method is as follows: Figure 4 The following are included:

[0078] S01. Place the metal sealing assembly 6 between the sealing sleeve body 3 and the pressure ring 7, and initially connect the sealing sleeve body 3 and the pressure ring 7 by tightening screws 8 to form a sealing hanger.

[0079] S02. The suspension seal is installed inside the housing 5, so that the second rubber sealing ring 4 contacts and seals with the inner wall of the housing 5, and the sealing sleeve body 3 abuts against the limiting protrusion 501.

[0080] S03. Insert the sleeve 1 from the end of the housing 5 so that the outer wall of the sleeve 1 contacts and seals with the first rubber sealing ring 2;

[0081] S04. Tighten the clamping screw 8 to reduce the distance between the pressure ring 7 and the sealing sleeve body 3, thereby increasing the axial overlap of the inner cone ring 601 and the outer cone ring 602, and making the sealing ring protrusions of the inner cone ring 601 and the outer cone ring 602 contact and seal with the outer wall of the sleeve 1 and the inner wall of the housing 5, respectively.

[0082] S05. Install the tip 9 with the housing 5 so that the tip 9 abuts against the pressure ring 7.

[0083] The above method can quickly complete the assembly of the sealing hanger and the sleeve head, effectively ensuring the sealing performance of the sealing contact surface, and ensuring that the sealing hanger and the sleeve head have a good relative positional relationship, thus ensuring their durability in high temperature, high pressure and corrosive environments.

[0084] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0085] The sealing hanger, sleeve head, and their usage method provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A sealed hanger, characterized by, The utility model relates to a sealing hanger, comprising: a sealing sleeve body (3) in ring structure, with a first rubber sealing ring (2) and a second rubber sealing ring (4) arranged on the inner and outer ring surfaces respectively; a compression ring (7) in ring structure, connected with the sealing sleeve body (3) through a compression screw (8), the axis of the compression screw (8) being parallel to the center line direction of the compression ring (7) and the sealing sleeve body (3); a metal sealing assembly (6) arranged between the adjacent end surfaces of the sealing sleeve body (3) and the compression ring (7), comprising an inner tapered ring (601) and an outer tapered ring (602) made of metal material, the inner tapered ring (601) and the outer tapered ring (602) being coaxially sleeved; the contact ring surfaces of the inner tapered ring (601) and the outer tapered ring (602) are tapered surfaces, and the non-contact ring surfaces of the inner tapered ring (601) and the outer tapered ring (602) are both provided with sealing ring protrusions for contact sealing; the inner tapered ring (601) and the outer tapered ring (602) partially overlap in the axial direction; when the compression screw (8) is tightened, the distance between the sealing sleeve body (3) and the compression ring (7) decreases, the overlapping amount of the inner tapered ring (601) and the outer tapered ring (602) increases, and the inner tapered ring (601) and the outer tapered ring (602) are pressed against each other to deform.

2. The sealed hanger of claim 1, wherein, The cross section of the sealing sleeve body (3) is T-shaped, the inner and outer ring surfaces of the horizontal wall of the sealing sleeve body (3) are respectively provided with annular grooves, and the first rubber sealing ring (2) and the second rubber sealing ring (4) are arranged in the annular grooves of the inner and outer ring surfaces of the horizontal wall respectively; the inner and outer ring surfaces of the vertical wall of the sealing sleeve body (3) are respectively provided with the metal sealing assembly (6), the sealing ring protrusion of the outer tapered ring (602) on the corresponding side is in contact sealing with the inner ring surface of the vertical wall, and the sealing ring protrusion of the inner tapered ring (601) on the corresponding side is in contact sealing with the outer ring surface of the vertical wall.

3. The sealed hanger of claim 2, wherein, The bottom surface of the compression ring (7) is provided with an annular groove, and the vertical wall of the sealing sleeve body (3) is fitted and installed in the annular groove; the top end of the vertical wall of the sealing sleeve body (3) is provided with a threaded hole, the bottom of the annular groove is provided with a through hole, and the compression screw (8) is fitted and installed with the threaded hole after penetrating through the through hole.

4. The sealed hanger of claim 1, wherein, The outer ring surface of the inner tapered ring (601) is an outer tapered surface (6011), the inner ring surface of the inner tapered ring (601) is provided with two groups of inner sealing ring protrusions (6012) at the upper and lower ends respectively, and the inner ring surface of the inner sealing ring protrusion (6012) is an arc surface.

5. The sealed hanger of claim 4, wherein, The inner ring surface of the outer tapered ring (602) is an inner tapered surface (6021), the inner tapered surface (6021) and the outer tapered surface (6011) abut and partially overlap; the outer ring surface of the outer tapered ring (602) is provided with two groups of outer sealing ring protrusions (6022) at the upper and lower ends respectively, and the outer ring surface of the outer sealing ring protrusion (6022) is an arc surface.

6. A casing head characterized by, The sealing hanger of any one of claims 1-5 is included.

7. A bushing head according to claim 6, characterized in that Also include a cylindrical shell (5), the inner wall of the shell (5) and close to the sealing ring convex contact seal, the inner wall of the shell (5) and the second rubber seal ring (4) contact seal; The inner wall of the shell (5) is provided with a limiting convex (501), and the limiting convex (501) abuts against the end of the sealing sleeve body (3) away from the compression ring (7); The shell (5) is provided with a top (9), and the top (9) abuts against the end of the compression ring (7) away from the sealing sleeve body (3).

8. A bushing head according to claim 7, characterized in that The shell (5) is provided with a threaded hole in the radial direction, and the top (9) is screw connected in the threaded hole, and the contact surfaces of the top (9) and the compression ring (7) are both conical surfaces.

9. A method of use, applied to the spooling head according to any one of claims 6-8, characterized in that, The use method comprises: The metal sealing assembly (6) is placed between the sealing sleeve body (3) and the compression ring (7), and the sealing sleeve body (3) and the compression ring (7) are preliminarily connected through the compression screw (8) to form the sealing hanger; The hanger sealing device is installed in the shell (5), the second rubber seal ring (4) is in contact with the inner wall of the shell (5), and the sealing sleeve body (3) abuts against the limiting convex (501); Insert the sleeve (1) from the end of the shell (5), so that the outer wall of the sleeve (1) is in contact with the first rubber seal ring (2); Tighten the compression screw (8), reduce the distance between the compression ring (7) and the sealing sleeve body (3), increase the axial overlap amount of the inner conical ring (601) and the outer conical ring (602), and make the sealing ring convex of the inner conical ring (601) and the outer conical ring (602) contact seal with the outer wall of the sleeve (1) and the inner wall of the shell (5) respectively; The top (9) is installed in cooperation with the shell (5), so that the top (9) abuts against the compression ring (7).

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