Large-gap-seal (“LGS”) assembly

Patent metadata

Field	Value
Publication number	US-10436372-B2
Application number	US-201715728320-A
Country	US
Kind code	B2
Filing date	Oct 9, 2017
Priority date	Oct 9, 2017
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A large-gap-seal (“LGS”) assembly and methods for its assembly and use are described. The LGS assembly has an elastomer core surrounded by adjoining structural segments. Non-adjoining gap segments are located on the sidewall surfaces of the elastomer core, with each gap segment approximately centered beneath the edges of two adjoining structural segments. The gap segments are exposed by the spaces that form between the structural segments when the LGS assembly is activated. Exposing the gap segments rather than the elastomer core protects the elastomer core from damage and preserves the integrity of the seal between the isolation tool and the inner wall of the pipeline.

First claim

What is claimed:

1. A large-gap-seal assembly for a piggable isolation tool comprising:
a plurality of circumferentially spaced apart gap segments located on a sidewall of an elastomer core, the elastomer core being exposed on the sidewall between adjacent gap segments of the plurality of gap segments; and
a plurality of structural segments located above the gap segments;
each structural segment adjoining an adjacent structural segment along opposing longitudinal edges when the elastomer core is in an inactivated size, a longitudinal centerline of each gap segment lying approximately below the opposing longitudinal edges; and
each structural segment not adjoining the adjacent structural segment along the opposing longitudinal edges when the elastomer core is in an activated size, wherein in the activated size a portion of the gap segment is exposed between adjacent structural segments.

2. A large-gap-seal assembly according to claim 1 further comprising the elastomer core having a fully activated size wherein each gap segment is sized to cover a portion of the sidewall of the elastomer core larger than a space formed between the opposing longitudinal edges of the structural segments when the elastomer core is at the fully activated size.

3. A large-gap-seal assembly according to claim 1 wherein each gap segment is sized to cover a first portion of the sidewall of the elastomer core when the elastomer core is in the inactivated size, the first portion spanning between an inside diameter edge and an outside diameter edge of the elastomer core equal to 360°/2N, where N is the number of gap segments.

4. A large-gap-seal assembly according to claim 1 wherein each structural segment is sized to cover a second portion of the sidewall of the elastomer core when the elastomer core is in the inactivated size, the second portion spanning between an inside diameter edge and an outside diameter edge of the elastomer core equal to 360°/M, where M is the number of structural segments.

5. A large-gap-seal assembly according to claim 1 wherein a core face surface of the structural segment is complementary in profile to the respective opposing second portion of the sidewall of the elastomer core.

6. A large-gap-seal assembly according to claim 1 wherein a core face surface of the gap segment is in contact with the respective opposing first portion of the sidewall of the elastomer core.

7. A large-gap-seal assembly according to claim 1 wherein the gap segments are rectangular or v-shaped.

8. A large-gap-seal assembly according to claim 1 wherein a glide plate is located on a plug pressure head surface of the structural segment.

9. A large-gap-seal assembly according to claim 1 further comprising means for controlling a position of the structural segment.

10. A large-gap-seal assembly according to claim 9 wherein the means for controlling the position of the structural segment is a guide slot on a plug pressure head that receives a guide tab on a glide plate attached to a plug pressure head face surface of the structural segment.

11. A large-gap-seal assembly according to claim 9 wherein the means for controlling the position of the structural segment is a guide slot on a glide plate attached to a plug pressure head face surface of the structural segment that receives a guide tab on the plug pressure head.

12. A large-gap-seal assembly according to claim 1 wherein a guide pocket in the structural segment receives a guide pin on a plug pressure head face surface of the gap segment, thereby controlling spacing between the structural segment and the gap segment.

13. A large-gap-seal assembly according to claim 1 wherein a guide pocket in the gap segment receives a guide pin on a core face surface of the structural segment, thereby controlling spacing between the structural segment and the gap segment.

14. A large-gap-seal assembly according to claim 1 wherein a seal return spring is located inside or above the structural segment.

15. A large-gap-seal assembly according to claim 1 wherein the gap segment or the structural segment has a flexible lip that overlaps an outside diameter edge of the elastomer core.

16. A large-gap-seal assembly according to claim 1 wherein lubricant is applied to the sidewall of the elastomer core, a core face surface of the gap segments, or a plug pressure head face surface of the gap segments.

17. A large-gap-seal assembly according to claim 1 further comprising twelve structural segments and twelve gap segments.

18. A large-gap-seal assembly according to claim 1 wherein the elastomer core is divided into a plurality of rings.

19. A piggable isolation tool for a pipeline, the tool comprising a plurality of large-gap-seal assemblies, wherein each large-gap-seal assembly comprises:
a plurality of circumferentially spaced apart gap segments located on a sidewall of an elastomer core, the elastomer core being exposed on the sidewall between adjacent gap segments of the plurality of gap segments; and
a plurality of structural segments located above the gap segments, each structural segment adjoining an adjacent structural segment along opposing longitudinal edges when the elastomer core is in an inactivated size, a longitudinal centerline of each gap segment lying approximately below the opposing longitudinal edges;
each structural segment not adjoining the adjacent structural segment along the opposing longitudinal edges when the elastomer core is in an activated size;
wherein in the activated size a portion of the gap segment is exposed between adjacent structural segments.

20. A method of deploying a large-gap-seal assembly comprising:
placing the large-gap-seal assembly at a selected location within a pipeline, the large-gap-seal assembly having an elastomer core, a plurality of circumferentially spaced apart gap segments on a sidewall of the elastomer core, and a plurality of structural segments above the gap segments; and
pressurizing the elastomer core to create a space between opposing longitudinal edges of adjacent structural segments and expose a gap segment;
wherein the elastomer core is exposed on the sidewall between adjacent gap segments of the plurality of spaced apart gap segments;
wherein before the pressurizing each structural segment adjoins an adjacent structural segment along opposing longitudinal edges; and
wherein after the pressurizing each structural segment is not adjoining the adjacent structural segment along the opposing longitudinal edges; and
wherein after the pressurizing a portion of the gap segment is exposed between adjacent structural segments.

21. A method of deploying a large-gap-seal assembly according to claim 20 , further comprising de-pressurizing the elastomer core of the large-gap-seal assembly.

22. A large-gap-seal assembly for a piggable isolation tool comprising:
a plurality of spaced apart gap segments located on a sidewall of an elastomer core; and
a plurality of structural segments located above the gap segments;
each structural segment adjoining an adjacent structural segment along opposing longitudinal edges when the elastomer core is in an inactivated size, a longitudinal centerline of each gap segment lying approximately below the opposing longitudinal edges; and
means for controlling a position of the structural segment.

23. A large-gap-seal assembly according to claim 22 , wherein the means for controlling the position include a glide plate located on a plug pressure head

Assignees

• Tdw Delaware Inc

Inventors

• Bjorsvik Vigmund
• Langerholc Marko

Classifications

• F16J15/028

  the packing being mechanically expanded against the sealing surface · CPC title

• F16J15/022

  characterised by structure or material · CPC title

• F16J15/20

  Packing materials therefor · CPC title

• F16L55/44

  expandable · CPC title

• F16L55/1283 Primary

  Plugging pig · CPC title