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hybrid seal

A technology of sealing components and sealing rings, applied in sealing/isolation, wellbore/well parts, construction, etc., can solve the problems of high cost

Inactive Publication Date: 2017-03-01
VETCO GRAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In deep water, running the drill string from the rig to the subsea well mask is expensive

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0012] refer to figure 1 , the wellhead housing 11 is a pipe member located at the upper end on the seabed. The wellhead housing 11 has a wellbore with side walls 13 . Casing hanger 15 is lowered into wellhead housing 11 and rests on a shoulder (not shown). A casing string (not shown) is attached to the lower end of the casing hanger 15 . A casing is incorporated in the well. Casing hanger 15 has an outer sidewall 17 spaced radially inward from borehole sidewall 13 . The outer sidewall 17 may have a central tapered portion 17a that tapers down to a cylindrical portion 17b of smaller diameter. A larger diameter cylindrical portion 17c extends upward from the tapered portion 17b. The wellbore sidewall 13 is typically cylindrical in this portion of the wellbore housing 11 . A sealed pocket 19 is defined by the annular space between the outer sidewall 17 and the borehole sidewall 13 . Sealed bag 19 has a lower end defined by an upwardly facing shoulder 21 located on the ext...

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PUM

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Abstract

The present disclosure relates to a hybrid seal. When in the run-in position, the casing hanger seal assembly is lowered into the pocket between the casing hanger and the wellhead housing. The seal assembly has a metal-to-metal upper seal ring and an elastomeric and metal lower seal ring carried by and beneath the upper seal ring. The upper and lower seal rings are movable from a running position to a set position, thereby sealing between the sidewall of the casing hanger and the wellhead housing by applying a downward force. The downward force required to move the lower seal ring to the set position is less than the downward force required to move the upper seal ring to the set position. A downward force applied to the upper sealing ring after the lower sealing ring has been placed in the bag is transmitted to the lower sealing ring to cause the lower sealing ring to move to the set position before the upper sealing ring moves to the set position.

Description

technical field [0001] The present disclosure relates generally to subsea wellhead seals, and more particularly to hybrid seals having a metal-to-metal primary sealing portion and a secondary portion that acts as an emergency seal. Background technique [0002] During formation of a subsea well, a wellhead assembly, including a wellhead housing, is positioned at the upper end of the wellbore on the seabed. As the well is drilled deeper, the drill string travels through the wellhead housing. One or more strings of casing are lowered through the wellhead housing, each string of casing supported by a casing hanger that lands in the wellbore of the wellhead housing. A packer or casing hanger seal is set in a sealed pocket between the side surface of the casing hanger and the sidewall of the wellbore. The casing hanger seal is a preferred metal-to-metal seal that seals best when the sealing surfaces on the casing hanger and on the sidewall of the wellbore are in good condition....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/035
CPCE21B33/00E21B33/03E21B33/035E21B33/043E21B2200/01E21B33/1212
Inventor K·A·杜恩
Owner VETCO GRAY