Seal assembly for downhole use
AssigneeBaker Hughes, A Ge Company, LLC
InventorAndreas Peter
Life of this patent
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Abstract
A seal assembly for downhole use that includes a sealing ring, and a backup ring set generally coaxial with and adjacent to the sealing ring. A height of the backup ring exceeds a diameter of the sealing ring; and is disposed on a low pressure side of the seal assembly to prevent the sealing ring from extruding into the low pressure side. The backup ring is made of a core and a coating on the core. Material properties of the coating are generally unaffected when exposed to downhole conditions, and the coating prevents diffusion of fluid or gas molecules into the low pressure side.
Claims19
A downhole device for use in a wellbore comprising:
- an outer section;
- an inner section partially inserted within the outer section;
- an interface defined between the inner and outer sections having a high pressure zone and a low pressure zone;
- and
- a seal assembly in the interface that comprises,
- a sealing ring having a side exposed to the high pressure zone,
- a backup ring disposed on a side of the sealing ring opposite from the high pressure zone and that comprises a core that is coated, and
- a first set of fibers in the core oriented substantially axially in the seal assembly and a second set of fibers in the core that are oriented substantially oblique to the first set of fibers, the first and second sets of fibers in a strategic arrangement that restricts thermal expansion of the core, wherein fibers in one of the first set of fibers and in the second set of fibers that are adjacent and bind with one another to form arrays that are set in different locations within the core.
A downhole device for use in a wellbore comprising:
- a housing having an outer surface;
- a chamber inside the housing;
- a flow path extending between the outer surface and chamber;
- and
- a seal assembly disposed in the flow path and that comprises,
- a sealing ring having a side in communication with the outer surface, and
- a backup ring adjacent the sealing ring having a side in communication with the chamber, a core, a coating over the core, and fibers that are adjacent and bind with one another to form arrays that are strategically oriented oblique to one another for restricting thermal expansion of the core to prevent cracking of the coating.
A downhole device for use in a wellbore comprising:
- a first section having an outer surface;
- a second section coupled with the first section;
- an interface formed between portions of the first and second sections;
- and
- a seal assembly disposed along the interface that comprises a backup ring that comprises a coating over a core, and a first array of fibers in the core arranged substantially perpendicular to a second array of fibers in the core, the first and second array of fibers are defined by fibers that are adjacent and bind to one another.
Dependencies are inferred from the claim text.