CN219241874U

CN219241874U - Annular metal seal

Info

Publication number: CN219241874U
Application number: CN202320831708.6U
Authority: CN
Inventors: 周云丰; 林元华; 邓宽海
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-06-23
Anticipated expiration: 2033-04-14

Abstract

The utility model relates to the field of metal sealing, and particularly provides an annular metal seal which comprises an outer deformation groove, a thickness gradual change inclined plane and a sleeve hanger, wherein an outer sealing point I is arranged above the outer deformation groove, an outer sealing point II is arranged above the outer sealing point I, and a driving groove chamfer II is arranged on one side of the outer deformation groove. When the test hydraulic pressure enters from the lower part, the inner sealing points and the outer sealing points have no rebound space in the radial direction under the state that the driving ring is rigidly locked, so that the test hydraulic pressure has high enough sealing force, and the upper part and the lower part are sealed.

Description

Annular metal seal

Technical Field

The utility model relates to the field of metal sealing, in particular to an annular metal seal.

Background

Along with the transition of ocean oil and gas exploitation from shallow water to deep water, the comprehensive performance requirement of metal sealing capability is higher and higher, and particularly along with the requirements of ocean oil and gas equipment localization, the development of the metal sealing with simple structure, safety, reliability, low processing difficulty and wide application range becomes urgent.

In the prior art, in the annular high-pressure metal structure, a metal and nonmetal combined sealing structure or a metal seal driven by a sleeve hanging inclined plane is mainly adopted.

The applicant found that the following problems exist in practical use:

(1) The combination of metal and nonmetal seals cannot be practically and completely called as a metal seal structure, and particularly nonmetal materials are easy to age and crack under high pressure, so that the application of the seal is severely restricted;

(2) The metal seal for sleeve hanging inclined surface driving has two problems, namely, the driving stroke is long, the sealing surface is easy to scratch, and the high-pressure seal is not facilitated; secondly, the push-down driving load is high, which restricts the field use.

Accordingly, there is a need to provide an annular metal seal that addresses the above-described problems.

Disclosure of Invention

The annular metal seal is simple in structure, safe, reliable, low in processing difficulty and wide in application range, and can effectively seal annular fluid pressure at the upper part and the lower part.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: an annular metal seal comprises an outer deformation groove, a thickness gradual change inclined surface and a sleeve hanger, wherein an outer sealing point I is arranged above the outer deformation groove, an outer sealing point II is arranged above the outer sealing point I, a driving groove chamfer II is arranged on one side of the outer deformation groove, a sealing point I is arranged above the thickness gradual change inclined surface, a sealing point II is arranged above the sealing point I, a driving groove chamfer I is arranged on one side of the thickness gradual change inclined surface, a straight surface support is arranged above the driving groove chamfer I, a guide inclined surface is arranged on one side of the straight surface support, a driving inclined surface is arranged above the driving groove chamfer II, a bearing step II is arranged below the thickness gradual change inclined surface, a lower support ring is arranged on one side of the sleeve hanger, and the bearing step I and the bearing step II are convenient for supporting and transferring loads of the metal seal; the external threads are convenient for the assembly, connection and disassembly of the lower support ring, and the emergency sealing can be realized at different sealing positions by changing the lower support rings with different heights; the outer deformation groove reduces the structural rigidity, and is convenient for the deformation of the outer side of the metal seal, so that the contact between the outer side sealing point I and the outer side sealing point II is facilitated, and larger stress concentration is not formed at the positions of the driving groove chamfer I and the driving groove chamfer II; the outer sealing point I, the outer sealing point II, the sealing point I and the sealing point II are mainly used for sealing, and the yield strength of the material is lower than that of a wellhead and a sleeve hanger, so that the bump is ensured to generate plastic deformation to form high sealing capacity; the inner side of the driving groove is provided with a straight-face support which is matched with the driving ring to form a rigid support and the transmission of load; under the action of the driving ring, the driving inclined plane excites the inner and outer sealing points to form initial sealing; the guide ramps help guide the drive ring into the drive slot.

The bearing step II is further provided with a thread relief groove, and the external thread relief groove is arranged below the thread relief groove and also has the function of a stress relief groove.

The bearing step I is further arranged below the external thread.

Further, a driving ring is installed above the lower supporting ring, and an outer inclined surface of the driving ring is in contact with the driving inclined surface.

Further, an outer wellhead is arranged on one side of the driving ring.

Compared with the related art, the annular metal seal provided by the utility model has the following beneficial effects:

the utility model provides an annular metal seal, which moves downwards axially through a driving ring by virtue of the sealing structure, and an outer inclined surface of the annular metal seal contacts with the driving inclined surface, and the outer side of the metal seal is promoted to deform outwards under the guidance and driving of the inclined surface due to the support of the inner side straight surface of the driving groove, so that an initial seal is formed by the contact of an outer side sealing point II and an outer side sealing point I with the inner wall of an outer side wellhead in sequence; simultaneously, the driving inclined surface at the outer side of the driving groove counteracts the driving ring and continuously acts on the straight surface at the inner side of the driving groove, so that the inner side of the inner metal seal is promoted to deform inwards, and the second sealing point and the first sealing point are contacted with the outer wall of the sleeve hanger sequentially to form initial seal. When the test hydraulic pressure enters from the upper part, the U-shaped driving groove structure of the test hydraulic pressure contributes to the increase of the hydraulic pressure caused by the sealing contact stress of the test hydraulic pressure, so that the inner and outer sealing points have high enough sealing capability. When the test hydraulic pressure enters from the lower part, the inner sealing point and the outer sealing point have no rebound space in the radial direction under the state that the driving ring is rigidly locked, so that the test hydraulic pressure has high enough sealing force, and the upper part and the lower part are sealed.

Drawings

FIG. 1 is a schematic view of a ring-shaped metal seal according to a preferred embodiment of the present utility model;

FIG. 2 is a schematic illustration of the metal seal fit of the present utility model.

Reference numerals in the drawings: 1. carrying a first step; 2. an external thread; 3. a thread retracting groove; 4. an outer deformation groove; 5. an outer sealing point I; 6. an outer sealing point II; 7. carrying a second step; 8. a thickness gradual change inclined plane; 9. sealing point I; 10. sealing points II; 11. chamfering a first driving groove; 12. a second driving groove chamfer; 13. a straight support; 14. a driving inclined plane; 15. a guide slope; 16. an outer wellhead; 17. a drive ring; 18. sleeve hanging; 19. a lower support ring.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Exemplary embodiments of the present utility model are illustrated in the accompanying drawings.

Embodiment one:

as shown in fig. 1, the annular metal seal comprises an outer deformation groove 4, a thickness gradual change inclined surface 8 and a sleeve hanger 18, wherein an outer sealing point I5 is arranged above the outer deformation groove 4, an outer sealing point II 6 is arranged above the outer sealing point I5, a driving groove chamfer II 12 is arranged on one side of the outer deformation groove 4, a sealing point I9 is arranged above the thickness gradual change inclined surface 8, a sealing point II 10 is arranged above the sealing point I9, a driving groove chamfer I11 is arranged on one side of the thickness gradual change inclined surface 8, a straight surface support 13 is arranged above the driving groove chamfer I11, a guide inclined surface 15 is arranged on one side of the straight surface support 13, a driving inclined surface 14 is arranged above the driving groove chamfer II 12, a bearing step II 7 is arranged below the thickness gradual change inclined surface 8, and a lower support ring 19 is arranged on one side of the sleeve hanger 18.

As shown in fig. 1, a thread relief groove 3 is formed on one side of the bearing step II 7, and an external thread 2 is arranged below the thread relief groove 3.

As shown in fig. 1, a bearing step 1 is arranged below the external thread 2.

As shown in fig. 2, a driving ring 17 is mounted above the lower support ring 19, and an outer inclined surface of the driving ring 17 contacts with the driving inclined surface 14.

As shown in fig. 2, the drive ring 17 is provided with an outer wellhead 16 on one side.

In the implementation, the driving ring 17 moves downwards in the axial direction, the outer inclined surface of the driving ring is contacted with the driving inclined surface 14, and the outer side of the metal seal is forced to deform outwards under the guidance and driving of the inclined surface due to the straight surface support 13 at the inner side of the driving groove, so that the outer side sealing point II 6 and the outer side sealing point 5 are contacted with the inner wall of the outer side wellhead 16 in sequence to form initial sealing; simultaneously, the driving inclined surface 14 at the outer side of the driving groove reacts to the driving ring 17 and continuously acts on the straight surface at the inner side of the driving groove, so that the inner side of the inner metal seal is forced to deform inwards, and the second sealing point 10 and the first sealing point 9 are contacted with the outer wall of the casing hanger 18 sequentially to form an initial seal. When the test hydraulic pressure enters from the upper part, the U-shaped driving groove structure of the test hydraulic pressure contributes to the increase of the hydraulic pressure caused by the sealing contact stress of the test hydraulic pressure, so that the inner and outer sealing points have high enough sealing capability. When the test hydraulic pressure is introduced from the lower portion, since the inner and outer seal points have no space for rebound in the radial direction in the state where the drive ring 17 is rigidly locked, a sufficiently high sealing force is provided, and sealing of the upper and lower hydraulic pressures is achieved.

The technical scheme adopts the following operation steps:

1. preparation: the wellhead or wellhead and casing string are lowered into place, the sealing surfaces are flushed clean, and the lower support ring 19 is screwed onto the metal seal;

2. the metal seal is run into the outer wellhead 16, but in an inactive position, using a single pass running tool (metal seal and casing string running tool) or a metal seal running tool; at this point, the casing hanger 18 should be secured to sit on the outer wellhead 16 and lock.

3. The driving ring 17 moves downwards axially, the outer inclined surface of the driving ring contacts with the driving inclined surface 14, and the outer side of the metal seal is forced to deform outwards under the guidance and driving of the inclined surface due to the support of the inner side straight surface of the driving groove, and the outer side sealing point II 6 and the outer side sealing point I5 contact with the inner wall of the outer side wellhead 16 in sequence to form initial seal; simultaneously, the driving inclined surface 14 at the outer side of the driving groove reacts to the driving ring 17 and continuously acts on the straight surface 13 at the inner side of the driving groove, so that the inner side of the inner metal seal is forced to deform inwards, and the second sealing point 10 and the first sealing point 9 are contacted with the outer wall of the casing hanger 18 to form an initial seal.

4. And (3) hydraulic testing, namely, an upper hydraulic testing and a lower hydraulic testing can be respectively carried out.

5. And (5) recycling the tool.

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

Claims

1. The utility model provides an annular metal seal, includes outside deformation groove (4), thickness gradual change inclined plane (8) and casing string (18), its characterized in that: outside deformation groove (4) top is equipped with outside sealing point one (5), outside sealing point one (5) top is equipped with outside sealing point two (6), one side of outside deformation groove (4) is equipped with driving groove chamfer two (12), thickness gradual change inclined plane (8) top is equipped with sealing point one (9), sealing point one (9) top is equipped with sealing point two (10), one side of thickness gradual change inclined plane (8) is equipped with driving groove chamfer one (11), driving groove chamfer one (11) top is equipped with straight face support (13), straight face support (13) one side is equipped with guide bevel (15), driving groove chamfer two (12) top is equipped with driving bevel (14), thickness gradual change inclined plane (8) below is equipped with bears step two (7), sleeve hanger (18) one side is installed lower part supporting ring (19).

2. An annular metal seal according to claim 1, characterized in that a thread relief groove (3) is provided on one side of the second bearing step (7), and an external thread (2) is provided below the thread relief groove (3).

3. An annular metal seal according to claim 2, characterized in that a bearing step one (1) is provided below the external thread (2).

4. An annular metal seal according to claim 1, characterized in that a drive ring (17) is mounted above the lower support ring (19), the drive ring (17) outer bevel being in contact with the drive bevel (14).

5. An annular metal seal according to claim 4, characterized in that the drive ring (17) is provided on one side with an outer wellhead (16).