Sealed hanger and casing head

Abstract

The utility model discloses a sealing hanger and a casing head, and relates to the technical field of casing sealing, in particular to the sealing hanger and the casing head comprising a metal sealing assembly which is arranged between adjacent end faces of a sealing sleeve main 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] The utility model relates to the technical field of casing sealing, and more specifically, to a sealing hanger. In addition, the utility model also relates to a casing head including the above-mentioned sealing hanger. Background Art

[0002] In the oil drilling and completion process, the casing head is an important device for connecting between various layers of casings, between the casing and the blowout preventer, and for supporting and connecting with the oil / gas production wellhead after completion;

[0003] The sealing hanger is a component for fixing and sealing the contact between the above-mentioned casing head and the casing to be installed inside it;

[0004] In shale oil exploitation, it is necessary for the casing sealing hanger to maintain good sealing performance under harsh working conditions of high temperature and high pressure to ensure the safety and efficiency of oil and gas exploitation.

[0005] Currently, the sealing of the hanger mainly relies on the contact of the sealing ring for sealing. The sealing rings are divided into metal sealing rings and rubber sealing rings. The rubber sealing ring is a passive seal, which improves the sealing performance through its own deformation and has good corrosion resistance. However, at high temperatures, its own performance weakens and the sealing performance is unstable; while the metal sealing ring has better high-temperature resistance, but its corrosion resistance is weaker than that of the rubber sealing ring, and precise dimensions need to be matched to ensure good contact of the sealing surface to ensure its sealing performance, and the use cost is relatively high.

[0006] In summary, how to solve the sealing problem of the existing sealing hanger and casing head under high temperature, high pressure and corrosive environment is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0007] In view of this, the purpose of the utility model is to provide a sealing hanger, through the combined use of an inner conical ring and an outer conical ring, the size of the metal sealing component is adjustable to achieve active sealing, thereby reducing the use cost and solving the use problem in high temperature and high pressure scenarios, and cooperating with a rubber sealing ring for secondary sealing to solve the use problem in a corrosive environment.

[0008] Another purpose of the utility model is to provide a casing head including the above-mentioned sealing hanger, which has the same technical features, can solve the same technical problems, and achieve the same purpose.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A sealing hanger, comprising:

[0011] The sealing sleeve body is of an annular structure, and a first rubber sealing ring and a second rubber sealing ring are respectively arranged on the inner ring surface and the outer ring surface;

[0012] The pressing ring is of an annular structure and is connected to the sealing sleeve body by a pressing screw, and the axis of the pressing screw is parallel to the center line direction of the pressing ring and the sealing sleeve body;

[0013] The metal sealing assembly is arranged between the adjacent end faces of the sealing sleeve body and the pressing ring, and includes an inner conical ring and an outer conical ring made of a metal material. The inner conical ring and the outer conical ring are coaxially sleeved; the contact ring surfaces of the inner conical ring and the outer conical ring are conical surfaces, and sealing ring protrusions for contact sealing are arranged on the non-contact ring surfaces of the inner conical ring and the outer conical ring. The inner conical ring and the outer conical ring partially overlap axially; when the pressing screw is tightened, the distance between the sealing sleeve body and the pressing ring decreases, the overlapping amount of the inner conical ring and the outer conical ring increases, and the inner conical ring and the outer conical ring are mutually extruded and deformed.

[0014] Preferably, the cross section of the sealing sleeve body is T-shaped, annular grooves are respectively arranged on the inner ring surface and the outer ring surface of the horizontal wall of the sealing sleeve body, and the first rubber sealing ring and the second rubber sealing ring are respectively arranged in the annular grooves on the inner ring surface and the outer ring surface of the horizontal wall;

[0015] The metal sealing assemblies are respectively arranged on the inner ring surface and the outer ring surface of the vertical wall of the sealing sleeve body. The inner ring surface of the vertical wall is in contact sealing with the sealing ring protrusion of the outer conical ring on the corresponding side, and the outer ring surface of the vertical wall is in contact sealing with the sealing ring protrusion of the inner conical ring on the corresponding side.

[0016] Preferably, an annular groove is arranged on the bottom surface of the pressing ring, and the vertical wall of the sealing sleeve body is fitted and installed in the annular groove;

[0017] A threaded hole is arranged at the top end of the vertical wall of the sealing sleeve body, a through hole is arranged at the bottom of the annular groove, and the pressing screw passes through the through hole and is fitted and installed with the threaded hole.

[0018] Preferably, the outer ring surface of the inner conical ring is an outer conical surface (6011), two groups of inner sealing ring protrusions (6012) are respectively arranged 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 surface.

[0019] Preferably, the inner ring surface of the outer conical ring is an inner conical surface (6021), the inner conical surface (6021) and the outer conical surface (6011) are in contact and partially overlap; two groups of outer sealing ring protrusions (6022) are respectively arranged 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 surface.

[0020] A casing head includes the seal hanger described in any one of the above.

[0021] Preferably, the casing head further includes a cylindrical housing. The inner wall of the housing is in sealing contact with the seal ring protrusion adjacent thereto, and the inner wall of the housing is in sealing contact with the second rubber sealing ring.

[0022] A limiting protrusion is provided on the inner wall of the housing, and the limiting protrusion abuts against the end of the seal sleeve body away from the pressing ring.

[0023] A tip is provided in the housing, and the tip abuts against the end of the pressing ring away from the seal sleeve body.

[0024] Preferably, a threaded hole is provided in the housing along the radial direction, the tip is threadedly connected and arranged in the threaded hole, and the contact surfaces of both the tip and the pressing ring are conical surfaces.

[0025] Compared with the prior art, the seal hanger provided by the present utility model has at least the following beneficial effects:

[0026] 1. A rubber sealing ring is used for primary sealing to solve the use problem in a corrosive environment, isolate the corrosive medium from the metal sealing component, and prevent the metal sealing component from being corroded.

[0027] 2. A metal sealing component is used for secondary sealing to solve the use problem under high temperature and high pressure, and at the same time, together with the rubber sealing ring, a two-stage sealing is constructed to improve the overall sealing performance.

[0028] 3. In the metal sealing component, an inner conical ring and an outer conical ring design nested with each other is adopted. By changing the overlapping amount of the two, the inner conical ring and the outer conical ring are deformed, so as to increase the normal pressure of the contact surface, and further increase the sealing performance and static friction force of the contact sealing surface.

[0029] 4. The potential energy stored after the inner conical ring and the outer conical ring are extruded and deformed can ensure the long-term sealing of the equipment during the slow release process, and further improve the sealing reliability of the equipment.

[0030] The casing head provided by the present utility model includes the above-mentioned seal hanger and has the same beneficial effects. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0032] Figure 1 Structural schematic diagram of the specific seal hanger provided by the present utility model;

[0033] Figure 2 Structural schematic diagram of the specific metal seal assembly provided by the present utility model;

[0034] Figure 3 Structural schematic diagram of the specific casing head provided by the present utility model;

[0035] Figure 4 Flow schematic diagram of the specific usage method provided by the present invention.

[0036] Figures 1-3 In:

[0037] 1. Casing; 2. First rubber sealing ring; 3. Sealing sleeve body; 4. Second rubber sealing ring; 5. Housing; 501. Limiting projection; 6. Metal seal assembly; 601. Inner conical ring; 6011. Outer conical surface; 6012. Inner seal ring projection; 602. Outer conical ring; 6021. Inner conical surface; 6022. Outer seal ring projection; 7. Pressure ring; 8. Compression screw; 9. Tip. Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0039] The core of the present utility model is to provide a seal hanger. By using the inner conical ring and the outer conical ring in cooperation, the size of the metal seal assembly is adjustable, active sealing is achieved, and thus the use cost is reduced to solve the use problems in high-temperature and high-pressure scenarios. Moreover, secondary sealing is carried out in cooperation with rubber sealing rings to solve the use problems in corrosive environments.

[0040] Another core of the present utility model is to provide a casing head including the above seal hanger, which has the same technical features, can solve the same technical problems, and achieve the same purpose.

[0041] Another core of the present utility model is to provide a usage method applied to the above casing head, which can quickly complete the installation of the casing head and solve the use problems of the casing head in high-temperature, high-pressure and corrosive environments.

[0042] Please refer to Figures 1-2 , a seal hanger, comprising:

[0043] The sealing sleeve body 3 is of an annular structure, and a first rubber sealing ring 2 and a second rubber sealing ring 4 are respectively arranged on the inner ring surface and the outer ring surface;

[0044] The pressing ring 7 is of an annular structure and is connected to the sealing sleeve body 3 by a pressing screw 8. The axis of the pressing screw 8 is parallel to the center line direction of the pressing ring 7 and the sealing sleeve body 3;

[0045] The metal sealing assembly 6 is arranged between the adjacent end faces of the sealing sleeve body 3 and the pressing ring 7 and includes an inner conical ring 601 and an outer conical ring 602 made of a metal material. The inner conical ring 601 and the outer conical ring 602 are coaxially sleeved; the contact ring surfaces of the inner conical ring 601 and the outer conical ring 602 are conical surfaces, and sealing ring protrusions for contact sealing are arranged on the non-contact ring surfaces of the inner conical ring 601 and the outer conical ring 602. The inner conical ring 601 and the outer conical ring 602 partially overlap in the axial direction; when the pressing screw 8 is tightened, the distance between the sealing sleeve body 3 and the pressing ring 7 decreases, the overlapping amount 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 extruded and deformed;

[0046] During use, the metal sealing assembly 6 is located between the pressing ring 7 and the sealing sleeve body 3, and the inner conical ring 601 and the outer conical ring 602 are nested with each other and partially overlap. After the pressing ring 7 and the sealing sleeve body 3 are connected by the pressing screw 8, the pressing screw 8 is further tightened to reduce the gap between the pressing ring 7 and the sealing sleeve body 3, that is, both ends of the metal sealing assembly 6 are squeezed, forcing the axial overlap between the inner conical ring 601 and the outer conical ring 602 to increase, that is, the overlapping area of the inner conical surface 6021 and the outer conical surface 6011 increases, forcing the inner conical ring 601 and the outer conical ring 602 to deform, that is, the inner conical ring 601 has a deformation tendency of reducing the inner diameter, and the outer conical ring 602 has a deformation tendency of increasing the outer diameter. Combining with the sealing ring protrusions arranged on the non-contact surfaces of the inner conical ring 601 and the outer conical ring 602, they deform after the decompression effect on their contact surfaces, thereby increasing the contact area and the normal pressure of the contact surfaces, thus improving the sealing performance of the contact surfaces. At the same time, as the normal pressure increases, the static friction force between the contact surfaces increases synchronously, thereby improving the stability of the sealing hanger. Moreover, when the metal sealing assembly 6 is at a high temperature, a thermal expansion effect occurs, further increasing the normal pressure and the deformation amount of the contact surfaces, that is, further increasing the static friction force and the sealing performance, that is, improving the thermal stability of the sealing hanger;

[0047] At the same time, the inner conical ring 601 and the outer conical ring 602 are sealed by means of extrusion deformation. Preferably, both are made of metal materials such as 304 stainless steel. After deformation, a certain amount of deformation potential energy can be stored inside. This part of the energy can be slowly released for a long time during the working process to ensure the sealing performance of the contact surfaces for a long time, that is, improving the reliability of the seal;

[0048] Meanwhile, a first rubber sealing ring 2 and a second rubber sealing ring 4 are respectively arranged on the inner ring surface and the outer ring surface of the sealing sleeve body 3 for primary sealing, which is combined with the secondary sealing of the metal sealing assembly 6 to achieve two-stage sealing. Through the two-stage sealing, the durability of the sealing hanger in high-temperature, high-pressure and corrosive environments is realized;

[0049] In the primary sealing, 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 material and have good self-lubricity and corrosion resistance, suitable for use in corrosive environments with high salt and high alkali. Moreover, the corrosive medium is isolated from the metal sealing assembly 6 to prevent the metal sealing assembly 6 from being corroded, thereby improving the overall durability.

[0050] As Figure 1 shown, the cross-section of the sealing sleeve body 3 is T-shaped. Annular grooves are respectively arranged on the inner ring surface and the outer ring surface of the horizontal wall of the sealing sleeve body 3, and the first rubber sealing ring 2 and the second rubber sealing ring 4 are respectively arranged in the annular grooves on the inner ring surface and the outer ring surface of the horizontal wall;

[0051] Metal sealing assemblies 6 are respectively arranged on the inner ring surface and the outer ring surface of the vertical wall of the sealing sleeve body 3. The inner ring surface of the vertical wall is in sealing contact with the sealing ring protrusion of the corresponding outer conical ring 602, and the outer ring surface of the vertical wall is in sealing contact with the sealing ring protrusion of the corresponding inner conical ring 601;

[0052] Through the design of the T-shaped cross-section of the sealing sleeve body 3, two sets of metal sealing assemblies 6 are integrated in the sealing sleeve body 3, which facilitates the arrangement of the pressing screws 8 and the overall structural design. At the same time, it helps to reduce the wall thickness of the inner conical ring 601 and the outer conical ring 602, so that under the action of end extrusion, it is easy to deform, that is, it is easy to increase the deformation amount of the sealing ring protrusion, and increase the contact area and sealing performance between the sealing ring protrusion and the contact surface;

[0053] At the same time, the design of the sealing sleeve body 3 with a T-shaped cross-section helps to ensure the radial position limitation of the metal sealing assembly 6, ensure the coaxiality of the metal sealing assembly 6 and the sealing sleeve body 3, and thus helps to ensure the overall sealing performance after assembly.

[0054] In some embodiments, an annular groove is arranged on the bottom surface of the pressing ring 7, and the vertical wall of the sealing sleeve body 3 is fitted and installed in the annular groove;

[0055] A threaded hole is arranged at the top end of the vertical wall of the sealing sleeve body 3, and a through hole is arranged at the bottom of the annular groove. The pressing screw 8 passes through the through hole and is fitted and installed with the threaded hole;

[0056] An annular groove is formed at the bottom of the pressure ring 7, and the vertical wall of the sealing sleeve body 3 is inserted into the annular groove, which is convenient for the mutual positioning of the pressure ring 7 and the sealing sleeve body 3, ensuring their coaxiality, and avoiding the inner and outer ring surfaces of the pressure ring 7 from contacting the surfaces for sealing, thereby affecting the contact sealing of the metal sealing assembly 6.

[0057] At the same time, through holes are adopted in the pressure ring 7 for the penetration of the compression screw 8. That is, by tightening the compression screw 8, the action of pressing the pressure ring 7 can be realized. By using a torque wrench to perform the torque-controlled rotation of the compression screw 8, the specific quantification of the deformation magnitudes of the inner conical ring 601 and the outer conical ring 602 can be achieved.

[0058] In some embodiments, the outer ring surface of the inner conical ring 601 is an outer conical surface 6011. At the upper and lower ends of the inner ring surface, two groups of inner sealing ring protrusions 6012 are respectively arranged, and the inner ring surface of the inner sealing ring protrusions 6012 is an arc surface.

[0059] The inner ring surface of the outer conical ring 602 is an inner conical surface 6021, and the inner conical surface 6021 abuts and partially overlaps with the outer conical surface 6011. At the upper and lower ends of the outer ring surface of the outer conical ring 602, two groups of outer sealing ring protrusions 6022 are respectively arranged, and the outer ring surface of the outer sealing ring protrusions 6022 is an arc surface.

[0060] As Figure 2 shown, on the surfaces of the inner conical ring 601 and the outer conical ring 602 for contact sealing, four groups of sealing ring protrusions are arranged. The arrangement method is two groups at the upper end and two groups at the lower end. By arranging the sealing ring protrusions, the processing difficulty of the sealing contact surface is effectively reduced, and through the double sealing at the upper and lower ends, the sealing performance is further improved. Moreover, the contact surfaces of the sealing ring protrusions all adopt an arc structure. When the inner conical ring 601 and the outer conical ring 602 are deformed under extrusion, the sealing ring protrusions also deform. As the deformation amount of the sealing ring protrusions increases, the contact surfaces of its arc structure deform, and the contact area with the sealing surface gradually increases, thereby increasing its sealing performance.

[0061] In addition to the seal hanger disclosed in each of the above embodiments, the present invention also provides a casing head including the above seal hanger.

[0062] As Figure 3 shown, the casing head further includes a cylindrical housing 5. The inner wall of the housing 5 is in contact sealing with the sealing ring protrusions close to it, and the inner wall of the housing 5 is in contact sealing with the second rubber sealing ring 4.

[0063] A limiting protrusion 501 is provided on the inner wall of the housing 5, and the limiting protrusion 501 abuts against the end of the sealing sleeve body 3 away from the pressure ring 7.

[0064] A top 9 is arranged in the housing 5, and the top 9 abuts against the end of the pressure ring 7 away from the sealing sleeve body 3.

[0065] The positions of the housing 5 and the seal hanger are defined by the limit protrusion 501 and the center point 9, so as to ensure the relative position stability between the two during operation.

[0066] In some embodiments, a threaded hole is provided in the housing 5 along the radial direction, and the center point 9 is threadedly connected in the threaded hole. The contact surfaces of both the center point 9 and the pressure ring 7 are conical surfaces.

[0067] The center point 9 is connected to the housing 5 by means of threaded connection, and a conical surface is provided at the end. As the screwing-in amount of the center point 9 increases, the pressure of its end on the pressure ring 7 increases, which facilitates the assembly and fixation of the seal hanger, and helps to apply a pre-tightening force to the hanging seal, ensuring its stability during use.

[0068] As Figure 4 shown, when assembling the seal hanger and the casing head, the following steps are carried out:

[0069] S01. Place the metal seal assembly 6 between the seal sleeve body 3 and the pressure ring 7, and preliminarily connect the seal sleeve body 3 and the pressure ring 7 through the compression screw 8 to form a seal hanger.

[0070] S02. Set the hanging seal in the housing 5, make the second rubber sealing ring 4 contact and seal with the inner wall of the housing 5, and make the seal sleeve body 3 abut against the limit protrusion 501.

[0071] S03. Insert the casing 1 from the end of the housing 5, so that the outer wall of the casing 1 contacts and seals with the first rubber sealing ring 2.

[0072] S04. Tighten the compression screw 8 to reduce the distance between the pressure ring 7 and the seal sleeve body 3, increase the axial overlap amount of the inner conical ring 601 and the outer conical ring 602, and make the seal ring protrusions of the inner conical ring 601 and the outer conical ring 602 contact and seal with the outer wall of the casing 1 and the inner wall of the housing 5 respectively.

[0073] S05. Install the center point 9 in cooperation with the housing 5, so that the center point 9 abuts against the pressure ring 7.

[0074] Through the above steps, the assembly of the seal hanger and the casing head can be quickly completed, effectively ensuring the sealing performance of the sealing contact surface, and ensuring a good relative position relationship between the seal hanger and the casing head, and ensuring its durability in high temperature, high pressure and corrosive environments.

[0075] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts between the various embodiments, reference can be made to each other.

[0076] The above has introduced in detail the sealing hanger and casing head provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A sealing hanger, characterized in that: include: The sealing sleeve body (3) is an annular structure, and the inner annular surface and the outer annular surface are respectively provided with a first rubber sealing ring (2) and a second rubber sealing ring (4); The pressure ring (7) is an annular structure and is connected to the sealing sleeve body (3) via a clamping screw (8), wherein 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); The metal sealing assembly (6) is arranged between the adjacent end faces of the sealing sleeve body (3) and the pressure ring (7), and comprises an inner cone ring (601) and an outer cone ring (602) made of metal material, wherein the inner cone ring (601) and the outer cone ring (602) are coaxially mounted; the contact ring surfaces of the inner cone ring (601) and the outer cone ring (602) are conical surfaces, and the non-contact ring surfaces of the inner cone ring (601) and the outer cone ring (602) are both provided with sealing ring protrusions for contact sealing, and the inner cone ring (601) and the outer cone ring (602) partially overlap in 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 amount of the inner cone ring (601) and the outer cone ring (602) increases, and the inner cone ring (601) and the outer cone ring (602) are mutually squeezed and deformed.

2. The sealing hanger according to claim 1, characterized in that: The sealing sleeve body (3) has a T-shaped cross section, and 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 respectively arranged in the annular grooves of the inner and outer ring surfaces of the horizontal wall; The metal sealing assembly (6) is respectively provided on the inner ring surface and the outer ring surface of the vertical wall of the sealing sleeve body (3); the inner ring surface of the vertical wall contacts and seals with the sealing ring protrusion of the outer cone ring (602) on the corresponding side; and the outer ring surface of the vertical wall contacts and seals with the sealing ring protrusion of the inner cone ring (601) on the corresponding side.

3. The sealing hanger according to claim 2, characterized in that: 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 in the annular groove; A threaded hole is provided at the top of the vertical wall of the sealing sleeve body (3), a through hole is provided at the bottom of the annular groove, and the clamping screw (8) passes through the through hole and is installed in cooperation with the threaded hole.

4. The sealing hanger according to claim 1, characterized in that: The outer ring surface of the inner cone ring (601) is an outer cone surface (6011), and two groups 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.

5. The sealing hanger according to claim 4, characterized in that: The inner ring surface of the outer cone ring (602) is an inner cone surface (6021), and the inner cone surface (6021) and the outer cone surface (6011) are in contact and partially overlapped; two groups of outer sealing ring protrusions (6022) are respectively provided at the upper and lower ends of the outer ring surface of the outer cone ring (602), and the outer ring surface of the outer sealing ring protrusion (6022) is an arc-shaped surface.

6. A casing head, characterized in that: The sealing hanger comprises the sealing hanger as claimed in any one of claims 1 to 5.

7. The casing head according to claim 6, characterized in that: It also comprises a cylindrical housing (5), the inner wall of the housing (5) being in contact and sealing with the sealing ring protrusion adjacent thereto, and the inner wall of the housing (5) being in contact and sealing with the second rubber sealing ring (4); The inner wall of the housing (5) is provided with a limiting protrusion (501), and the limiting protrusion (501) abuts against an end of the sealing sleeve body (3) away from the pressure ring (7); A tip (9) is provided in the housing (5), and the tip (9) abuts against an end of the pressure ring (7) away from the sealing sleeve body (3).

8. The casing head according to claim 7, characterized in that: A threaded hole is radially arranged inside the housing (5), and the tip (9) is threadedly connected and arranged in the threaded hole. The contact surfaces of the tip (9) and the pressure ring (7) are both conical surfaces.

Images