CN221503249U - Metal seal tail pipe hanger - Google Patents

Abstract

The utility model belongs to the field of oil and natural gas well cementing tools, and particularly relates to a metal sealing tail pipe hanger, which aims to solve the problems that a rubber sealing assembly becomes soft under the conditions of underground and high temperature, and cannot realize good sealing, so that pressure leakage is caused, any lateral sealing cannot be provided, and the pressure grade of the tool is limited. The utility model comprises the following steps: the hydraulic valve comprises a body, a port, a push ring, a hydraulic sleeve, a first metal seal and a second metal seal; the outer circumferential surface of the body is provided with a port which is used for flowing through hydraulic fluid so as to drive the hydraulic sleeve to move; the body is connected with the push ring, the push ring is in threaded connection with the hydraulic sleeve, and the push ring is used for driving the slips, so that setting is realized; the body is in sealing connection with the push ring and the hydraulic sleeve through a first metal seal; the body is sealed through second metal seal realization port and hydraulic sleeve sealing connection. The utility model reduces the possibility of slip setting failure, has higher reliability, has stronger slip setting capability and increases the reliability.

Description

Metal seal tail pipe hanger

Technical Field

The utility model belongs to the field of oil and natural gas cementing tools, and particularly relates to a metal sealing tail pipe hanger.

Background

After drilling the completion, various forms of completion assemblies may be installed to achieve control of the reservoir fluids and to increase their production efficiency. In some applications, a liner hanger and liner are deployed into a downhole wellbore, the liner hanger being suspended from a casing in the wellbore. The liner hanger may be hydraulically actuated to secure the liner hanger to the casing by applying hydraulic pressure to a hydraulic mechanism mounted on the liner hanger body.

Pressure is sealed between the hydraulic mechanism and the liner hanger by rubber elasticity, and under downhole and high temperature conditions, particularly under high pressure conditions, the rubber seal assembly may become soft and thus may not achieve a good seal, resulting in pressure leakage.

The bottom hole temperature of high temperature high pressure wells may be greater than 150 ℃, the bottom hole pressure exceeding 100Mpa, and at high temperatures the soft rubber seals do not provide any lateral seals, thus also limiting the pressure rating of the tool.

Based on the above, the utility model provides a metal seal liner hanger.

Disclosure of utility model

In order to solve the above-mentioned problems of the prior art, namely that the rubber seal assembly may become soft under downhole and high temperature conditions, particularly under high pressure conditions, and thus may not achieve a good seal, resulting in pressure leakage, at high temperatures the soft rubber seal may not provide any lateral seal, thus also limiting the pressure rating of the tool, the present utility model provides a metal seal liner hanger comprising a body, a port, a push ring, a hydraulic sleeve, a first metal seal and a second metal seal;

The outer circumferential surface of the body is provided with a port which is used for flowing through hydraulic fluid so as to drive the hydraulic sleeve to move;

The body is connected with the push ring, the push ring is in threaded connection with the hydraulic sleeve, and the push ring is used for driving slips so as to realize setting;

the body is in sealing connection with the push ring and the hydraulic sleeve through the first metal seal;

The body is in sealing connection with the hydraulic sleeve through compression of the second metal seal, and after the second metal seal is compressed, a metal-to-metal seal isolating the port can be formed and hydraulic fluid is prevented from flowing further through the port after the slip is set.

In some preferred embodiments, the body is connected to the push ring in the following specific manner:

The body is pinned to the slip retainer and the slip retainer is pinned to the push ring by a shearable pin.

In some preferred embodiments, the inner surface of the hydraulic sleeve is provided with a boss by which a sealing region is formed between the hydraulic sleeve and the body through which the hydraulic fluid flows through the port to thereby drive the hydraulic sleeve.

In some preferred embodiments, a seal support ring is disposed within the seal region, the seal support ring being located between a first support edge of the push ring and a second support edge of the hydraulic sleeve;

the second metal seal is disposed longitudinally between seal carrier rings, the second metal seal and the seal carrier rings being sized to create a radial gap prior to deformation that allows the hydraulic fluid to flow through the ports and into the seal area when pressurized to drive the hydraulic sleeve.

In some preferred embodiments, the hardness of the material of the second metal seal is less than the hardness of the material of the seal support ring, and movement of the hydraulic sleeve drives the seal support ring to compress the second metal seal, deforming the second metal seal, thereby forming a metal-to-metal seal.

In some preferred embodiments, the second metal seal is comprised of a deformable structure that allows the second metal seal to deform.

In some preferred embodiments, the hydraulic sleeve is threadably connected to the push ring by a threaded region;

The outer circumferential surface of the body is provided with a key groove, a key capable of moving along the key groove is arranged in the key groove, the key is fixed with the hydraulic sleeve, and the rotary motion between the body and the hydraulic sleeve is realized through the cooperation of the key and the key groove;

The rotational movement is such that the hydraulic sleeve rotates along a threaded region on a push ring provided on the body, thereby forming a metal seal.

In some preferred embodiments, the shear screw is provided at an end of the threaded region adjacent to the second metal seal, with which the push ring and the hydraulic sleeve are secured for locking against relative rotation during running and setting of the casing by the slips.

In some preferred embodiments, an annular groove is formed in the outer circumferential surface of the body, the first metal seal is fixed in the annular groove, the first metal seal comprises a coil spring and a sealing plate, the sealing plate at least overlaps with a part of the outer part of the coil spring, the coil spring is fixed in the annular groove, one end of the sealing plate is fixed with the annular groove, and the other end of the sealing plate is fixed with the push ring.

In some preferred embodiments, the coil spring is helical, and the material of the coil spring comprises a flexible metal.

In some preferred embodiments, the coil spring is manufactured from spring steel by rolling and welding.

The utility model has the beneficial effects that:

1. The all-metal sealing structure eliminates the risk of failure of the rubber sealing material in a high-temperature and high-pressure environment, and increases the reliability of the tail pipe hanger.

2. The hydraulic driving device of the liner hanger adopts a compressible metal sealing structure to seal the pressure transmission port, so that the possibility of slip setting failure is reduced, the reliability is higher, and the slip setting capacity is stronger.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic illustration of a metal seal liner hanger;

FIG. 2 is a schematic illustration of a wellbore anchoring device for a metal seal liner hanger;

FIG. 3 is a schematic view of a hydraulic sleeve assembly of a metal seal liner hanger

Fig. 4 is a schematic view of a metal seal construction of a hydraulic sleeve of a metal seal liner hanger.

Fig. 5 is a schematic view of a metal seal structure and shear member of a hydraulic sleeve of a metal seal liner hanger.

FIG. 6 is a schematic illustration of a push ring and slip retainer of a metal seal liner hanger driving liner hanger slips.

Fig. 7 is a schematic view of a metal seal construction of a metal seal liner hanger.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the present utility model are shown in the drawings.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

The present utility model provides a metal seal liner hanger comprising a body 66, a port 88, a push ring 96, a hydraulic sleeve 74, a first metal seal 94 and a second metal seal 112;

The outer circumferential surface of the body 66 is provided with a port 88, and the port 88 is used for flowing hydraulic fluid so as to drive the hydraulic sleeve 74 to move;

The body 66 is connected with the push ring 96, the push ring 96 is in threaded connection with the hydraulic sleeve 74, and the push ring 96 is used for driving the slips 70 so as to realize setting;

The body 66 is sealingly connected to the push ring 96 and the hydraulic sleeve 74 by the first metal seal 94;

The body 66 is sealingly coupled to the port 88 and the hydraulic sleeve 74 by compression of the second metal seal 112, which, after compression of the second metal seal 112, may form a metal-to-metal seal isolating the port 88 and preventing hydraulic fluid from flowing further through the port 88 after the slips 70 are set.

As a further explanation of the utility model, the body 66 is connected to the push ring 96 in a specific manner:

The body 66 is pinned to the slip retainer 98 and the slip retainer 98 is pinned to the push ring 96 by a shearable pin.

As a further explanation of the utility model, the inner surface of the hydraulic sleeve 74 is provided with a boss by which a sealing area 90 is formed between the hydraulic sleeve 74 and the body 66, through which sealing area 90 the hydraulic fluid flows through the ports 88, thereby driving the hydraulic sleeve 74.

As a further explanation of the present utility model, a seal support ring 114 is disposed within the seal region 90, the seal support ring 114 being located between a first support edge 116 of the push ring 96 and a second support edge 118 of the hydraulic sleeve 74;

The second metal seal 112 is disposed longitudinally between seal carrier rings 114, the second metal seal 112 and the seal carrier rings 114 being sized to create a radial gap prior to deformation that allows the hydraulic fluid to flow through the ports 88 and into the seal area 90 when pressurized to drive the hydraulic sleeve 74.

As a further explanation of the present utility model, the hardness of the material of the second metal seal 112 is less than the hardness of the material of the seal support ring 114, and movement of the hydraulic sleeve 74 drives the seal support ring 114 to compress the second metal seal 112, deforming the second metal seal 112, thereby forming a metal-to-metal seal.

As a further explanation of the present utility model, the second metal seal 112 is constituted by a deformable structure that allows the second metal seal 112 to deform.

As a further explanation of the present utility model, the hydraulic sleeve 74 is threadably coupled to the push ring 96 by a threaded region 100;

A key groove 106 is formed on the outer circumferential surface of the body 66, a key 104 capable of moving along the key groove 106 is arranged in the key groove 106, the key 104 is fixed with the hydraulic sleeve 74, and the rotation locking between the body 66 and the hydraulic sleeve 74 is realized through the matching of the key 104 and the key groove 106;

The rotational movement is such that the hydraulic sleeve 74 rotates along a threaded region 100 provided on a push ring 96 on the body 66, thereby forming a metal seal.

As a further explanation of the utility model, at the end of the threaded region 100 near the second metal seal 112, the shear screw 102 is provided, with the shear screw 102 securing the push ring 96 and the hydraulic sleeve 74 for effecting locking of the push ring 96 and the hydraulic sleeve 74 against relative rotation during running and setting of the casing 28 by the slips 70.

As a further explanation of the present utility model, the outer circumferential surface of the body 66 is provided with an annular groove, the first metal seal 94 is fixed in the annular groove, the first metal seal 94 includes a coil spring 105 and a sealing plate 107, the sealing plate 107 is overlapped with at least a part of the outside of the coil spring 105, the coil spring 105 is fixed in the annular groove, one end of the sealing plate 107 is fixed with the annular groove, and the other end of the sealing plate 107 is fixed with the push ring 96.

As a further explanation of the present utility model, the coil spring 105 is spiral, and the material of the coil spring 105 includes a flexible metal.

As a further explanation of the present utility model, the material of the second metal seal 112 includes a softer material and/or a deformable material than the seal support ring 114.

As a further explanation of the present utility model, the coil spring 105 is manufactured by rolling and welding a spring layer.

More specifically, in the present embodiment, the specific connection manner and the movement state between the structures of the hanger are described as follows:

fig. 1 is a schematic view of a metal seal liner hanger. In this embodiment, the liner suspension system 38 includes a liner suspension mechanism 22 generally located adjacent to a top packer 40, and the top packer 40 may be actuated to form a seal between the liner suspension system 38 and the surrounding casing 28. Other components in the liner suspension system 38 that may be combined with the liner hanger mechanism 22 include a swage collar 42, a float collar 44, and a float shoe 46. Running string 32 includes running tool 30, running tool 30 being disposed between recyclable base pipe 48 and swivel 50. The run in string 32 may also include components such as a slip joint 52, a swivel ball joint 54, a swab cup assembly 56, and a liner plug 58. The swivel ball seat joint 54 may include a ball seat 36 for receiving and forming a seal with the ball 34. Run-in string 32 has an open interior channel 60 to accommodate movement of fluids and/or devices. The internal passageway 60 enables internal movement of a device such as the ball 34 or the plug 62. The running string 32 may include various other and/or additional functions, such as a dust cap 64, depending on the application.

Fig. 2 shows an embodiment of the liner hanging mechanism 22. The liner hanging mechanism 22 includes a body 66 having a wellbore anchoring device 68 mounted thereon that is configured to grip the inner surface of the casing 28. When the liner hanging mechanism 22 is moved to a desired position along the wellbore, the liner hanging mechanism 22 is set, and the wellbore anchoring device 68 is moved to a position engaged with the casing 28. The wellbore anchoring device 68 is activated to ensure that the liner hanging mechanism 22 and liner do not move further down.

Specifically, the running tool 30 of the running string 32 deploys the liner hanging mechanism 22 and the entire liner to the desired downhole location. The wellbore anchoring device 68 is then hydraulically actuated to drive a plurality of liner hanging slips 70 into contact with the inner surface of the casing 28. As described above, the ball 34 may be plunged into the sealing engagement of the ball seat 36, thereby enabling pressurization within the liner hanging mechanism 22. The slips 70 are driven along respective drogues 72 by hydraulic sleeves 74 disposed about the body 66, the drogues 72 radially pressing the gripping teeth 75 of the slips 70 into the surrounding casing 28 as the slips 70 are driven longitudinally by the hydraulic sleeves 74. Once engaged, the wellbore anchoring device 68 resists downward movement of the liner hanging mechanism 22 and liner.

Arrow 76 indicates the direction of the hanging load applied by the liner and carried by the liner hanging slip 70. The load represented by arrow 76 may be transferred from the liner hanger body 66 to the drogue 72 as represented by arrow 78. This load is then transferred to the liner hanging slips 70 by, for example, the engaged ramp indicated by load arrow 80. The load force represented by arrow 80 is effective to transfer the lateral load of the liner hanging slips 70 into the respective casing 28, as represented by arrow 82. Accordingly, the liner hanging mechanism 22 is able to support the weight of the liner hanging from the liner hanger body 66 of the liner hanging mechanism 22.

Reference is made to fig. 3 and 4. The illustrated embodiment shows a cylindrical hydraulic sleeve 74 disposed about the body 66. The hydraulic sleeve 74 is disposed on a port 88 extending transversely through the body 66 from an internal passage 92 of the body 66. In some embodiments, ports 88 include a plurality of ports disposed circumferentially along body 66 and within hydraulic sleeve 74.

The applied hydraulic force passes through the internal passage 60 of the drop string 32 and the internal passage 92 of the liner hanging mechanism 22 and the ports 88 into the sealing area 90 between the body 66 and the hydraulic sleeve 74 to effect actuation of the liner hanging slips 70. As described above, pressurized hydraulic fluid flows downwardly through the internal passage 92, out of the ports 88, into the sealing area 90, and forces the hydraulic sleeve 74 in the direction of the liner hanging slips 70, as pressurized after the ball 34, within the passage 92 of the liner hanging mechanism 22. Described in more detail, pressurized hydraulic fluid may flow into and fill the sealing region 90 through a diametrical gap formed along the metal-to-metal sealing feature. The sealing area 90 may be defined by a plurality of seals 94, and these seals 94 may take the form of metal seals (see fig. 7).

According to the illustrated embodiment, the hydraulic sleeve 74 is connected to the liner hanging slips 70 by push rings 96. Additionally, a slip retainer 98 may be coupled between the push ring 96 and the liner hanging slips 70. The hydraulic sleeve 74 is coupled to the push ring 96 by a threaded region 100 and shear screws 102. Threaded region 100 includes threads that threadably engage along push ring 96 and along hydraulic sleeve 74. The push ring 96 and hydraulic sleeve 74 are locked against relative rotation by shear screws 102 during the run in and setting of the casing 28 by the slips 70.

Further, the hydraulic sleeve 74 may be rotationally locked relative to the body 66, for example, by a key 104 extending from the hydraulic sleeve 74 to a corresponding keyway 106 formed along the exterior of the body 66. The key 104 and corresponding keyway 106 allow limited longitudinal movement of the hydraulic sleeve 74 relative to the body 66 while preventing relative rotational movement between the hydraulic sleeve 74 and the body 66. The key 104 may be used to prevent relative rotational movement while allowing for the desired longitudinal movement.

It should be noted that shear pins 108 may be used to longitudinally secure hydraulic sleeve 74 on a temporary basis. In the illustrated embodiment, shear pins 108 longitudinally secure the hydraulic sleeve 74 to a suitable liner hanger body 110 to retain the hydraulic sleeve 74 during downhole run-in and prior to setting of the liner hanger slips 70. As shown in fig. 3 and 4, the shear pin 108 has been sheared and the hydraulic sleeve 74 is driven longitudinally relative to the body 66 by hydraulic force applied to the port 88.

Wherein the liner hanger body 110 is threadably connected to the body 66, the body 110 can be considered to be part of the body 66.

When the liner hanging slips 70 are secured to the surrounding casing 28, the liner hanging mechanism 22 is further actuated, forming a metal-to-metal seal, preventing subsequent actuating fluids from passing through the ports 88. The metal-to-metal seal may be formed via a second metal seal 112, which second metal seal 112 may be deformed appropriately to isolate the port 88 and prevent further fluid flow. As shown in fig. 4, a second metal seal 112 is placed longitudinally between seal support rings 114. The second metal seal 112 and seal support ring 114 may be sized to create a radial gap (prior to deformation) that allows pressurized hydraulic fluid to flow through the ports 88 and into the sealing area 90 to drive the hydraulic sleeve 74.

The seal support ring 114 is located between a first support edge 116 of the push ring 96 and a second support edge 118 of the hydraulic sleeve 74. The second metal seal 112 is constructed of a softer material than the seal support ring 114 and/or a deformable structure that allows the second metal seal 112 to deform, bringing the second metal seal 112 into sealing engagement with the body 66 as the seal support ring 114 is urged closer by the first and second support edges 116, 118.

In the illustrated embodiment, the second metal seal 112 is selectively deformed by rotation of the body 66 relative to the hydraulic sleeve 74. As described above, hydraulic sleeve 74 is engaged with push ring 96 by threaded region 100 and rotationally fixed relative to body 66 by key 104. As body 66 rotates, key 104 causes hydraulic sleeve 74 to shear pin 102 and rotate relative to push ring 96 along the threads of threaded region 100.

The tailpipe hanging slips 70 are tightly engaged with the casing 28, preventing rotation of the slips 70 and slip holders 98, and the push ring 96 is secured to the slip holders 98 by shear pins 120, as shown in FIG. 5. Thus, push ring 96 is held against rotation as hydraulic sleeve 74 rotates relative to body 66.

This relative rotation on threaded region 100 causes hydraulic sleeve 74 to be pulled toward push ring 96 until seal carrier ring 114 is engaged by first and second carrier edges 116, 118. Continued rotation of hydraulic sleeve 74 causes seal carrier ring 114 to continue to approach until second metal seal 112 sealingly engages body 66 over port 88, thereby preventing subsequent fluid flow through port 88. Continued rotation of the hydraulic sleeve 74 forces the shear pins 120 to shear and rotationally release the push ring 96 from the slip retainer 98, as shown in FIG. 6. The axial load from the second metal seal 112 may be used to provide a permanent rotational lock of the connection between the push ring 96 and the hydraulic sleeve 74 at the threaded region 100, thereby enabling the shear pin 120 to shear. Rotation of the hydraulic sleeve 74 also brings about rotation of the push ring 96 before that, and no additional deformation of the second metal seal 112 occurs.

Body 66 may be selectively rotated by running tool 30. For example, various embodiments may use corresponding positioning on the packer body of the packer 40 and the running tool 30 to transfer torque from the body 66 to the key 104 and the hydraulic sleeve 74 while locking the push ring 96, slip retainer 98, slips 70, and corresponding liner hanger cone 72 to the casing 28. The rotational movement results in a combination of threaded regions 100 between push ring 96 and hydraulic sleeve 74. Continued rotation will cause the second metal seal 112 to deform as desired. After second metal seal 112 is deformed with body 66 to form a metal-to-metal seal, hydraulic port 88 is permanently isolated.

The first metal seal 94 comprises a coil spring 105 of flexible metal and a separate annular metal seal plate 107, the seal plate 107 overlapping at least a portion of the exterior of the coil spring 105, the metal seal 94 being enclosed within an annular recess in the hanger body 66. The coil spring 105 is helical in shape and is made of a flexible metal, but the specific type of metal and the size of the coil spring 105 depend on the distance between the body 66 and the push ring 96, the pressure required to seal, and the medium of the sealed environment, the coil spring 105 being rolled and welded together from spring layers.

The terms "first," "second," and the like, are used for distinguishing between similar objects and not for describing a particular sequential or chronological order.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus/apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus/apparatus.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will be within the scope of the present utility model.

Claims (10)

1. A metal seal liner hanger comprising a run in string (32) and a liner suspension system (38), the liner suspension system (38) comprising a body (66), a port (88), a push ring (96), a hydraulic sleeve (74), a first metal seal (94) and a second metal seal (112);

A port (88) is formed in the outer circumferential surface of the body (66), and the port (88) is used for flowing through hydraulic fluid so as to drive the hydraulic sleeve (74) to move;

The body (66) is connected with the push ring (96), the push ring (96) is in threaded connection with the hydraulic sleeve (74), and the push ring (96) is used for driving the slips (70) so as to realize setting;

the body (66) is in sealing connection with the push ring (96) and the hydraulic sleeve (74) through the first metal seal (94);

The body (66) is sealingly connected to the port (88) by compression of the second metal seal (112), and the second metal seal (112) upon compression forms a metal-to-metal seal isolating the port (88) and prevents hydraulic fluid from flowing further through the port (88) after the slip (70) is set.

2. A metal seal liner hanger according to claim 1, wherein the body (66) is connected to the push ring (96) by:

the body (66) is pinned to a slip retainer (98), and the slip retainer (98) is pinned to the push ring (96) by a shearable pin.

3. A metal seal liner hanger according to claim 2, wherein the inner surface of the hydraulic sleeve (74) is provided with a boss by which a sealing area (90) is formed between the hydraulic sleeve (74) and the body (66), the hydraulic fluid flowing through the sealing area (90) through the port (88) to thereby drive the hydraulic sleeve (74).

4. A metal seal liner hanger according to claim 3, wherein a seal support ring (114) is provided within the seal area (90), the seal support ring (114) being located between a first support edge (116) of the push ring (96) and a second support edge (118) of the hydraulic sleeve (74);

The second metal seal (112) is disposed longitudinally between seal carrier rings (114), the second metal seal (112) and the seal carrier rings (114) being sized to create a radial gap prior to deformation that allows the hydraulic fluid to flow through the ports (88) and into the sealing region (90) when pressurized to drive the hydraulic sleeve (74).

5. A metal seal liner hanger as claimed in claim 4 wherein the hardness of the material of the second metal seal (112) is less than the hardness of the material of the seal support ring (114), movement of the hydraulic sleeve (74) driving the seal support ring (114) to compress the second metal seal (112) deforming the second metal seal (112) to form a metal-to-metal seal.

6. A metal seal liner hanger as claimed in claim 5, wherein the second metal seal (112) is formed of a deformable structure that allows the second metal seal (112) to deform.

7. A metal seal liner hanger according to claim 6, wherein the hydraulic sleeve (74) is threadedly connected to the push ring (96) by a threaded region (100); a key groove (106) is formed in the outer circumferential surface of the body (66), a key (104) capable of moving along the key groove is arranged in the key groove (106), the key (104) is fixed with the hydraulic sleeve (74), and the rotary motion between the body (66) and the hydraulic sleeve (74) is realized through the cooperation of the key (104) and the key groove (106);

The rotational movement is such that the hydraulic sleeve (74) rotates along a threaded region (100) provided on a push ring (96) on the body (66) to form a metal seal.

8. A metal seal liner hanger according to claim 7, wherein at an end of the threaded region (100) adjacent the second metal seal (112) there is provided a shear screw (102), the push ring (96) and the hydraulic sleeve (74) being secured by the shear screw (102) for effecting locking of the push ring (96) and the hydraulic sleeve (74) against relative rotation during running and setting of the casing (28) by the slips (70).

9. The metal seal liner hanger according to claim 8, wherein an annular groove is provided in an outer circumferential surface of the body (66), the first metal seal (94) is fixed in the annular groove, the first metal seal (94) includes a coil spring (105) and a seal plate (107), the seal plate (107) is overlapped with at least a part of an outside of the coil spring (105), the coil spring (105) is fixed in the annular groove, one end of the seal plate (107) is fixed with the annular groove, and the other end of the seal plate (107) is fixed with the push ring (96).

10. A metallic seal liner hanger as claimed in claim 9 wherein the coil spring (105) is helical, the material of the coil spring (105) comprising a flexible metal.