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US 5,287,925 AGranted
Wellhead apparatus
AssigneeDril-Quip, Inc.
InventorsBruce J. Watkins, Blake T. DeBerry
Life of this patent
Estimating the term…
Abstract
There is disclosed wellhead apparatus in which a pipe string is suspended within the bore of a housing and the annular space between the bore and the outer wall of the pipe string or a mandrel-type hanger from which the pipe string is suspended is closed by a seal assembly. The seal assembly is lowered into the annular space on a tool so as to close the same as seal rings carried about the outer and inner sides of the body are energized into sealing engagement with the bore of the housing and the outer wall.
Claims11
Wellhead apparatus, which comprises
- a housing having a bore therethrough and a port opening to the bore and valve means in the port permitting flow only toward the bore,
- means for suspending a pipe string within the bore of the housing,
- an assembly for closing an annular space between the bore and an outer wall of either the suspended pipe string or the means by which it is suspended, and
- a tool for lowering the assembly into landed position,
- said assembly including
- an annular body having first and second seal rings carried about its outer side for sealing with the bore above and below the opening of the port thereto and a third seal ring carried on its inner side for sealing with the outer wall,
- means responsive to actuation of the tool, following landing of the assembly, for energizing the first and second seal rings into sealing engagement with the bore, and
- means including passageway means in the body connecting with its outer side between the first and second seal rings so that, when the first and second seal rings are energized, a medium may be supplied through the port and passageway means to the third seal ring for energizing it into sealing engagement with the outer wall.
5 more elements
Wellhead apparatus, which comprises
- a housing having a bore therethrough and a port through which a fluid medium may be supplied to the bore,
- means for suspending a pipe string within the bore of the housing,
- an assembly lowerable into landed position in the bore for closing an annular space between the bore and an outer wall of either the suspended pipe string or the means by which it is suspended, and including
- an annular body having first and second seal rings carried about its outer side for sealing with the bore above and below the opening of the port thereto and a third seal ring carried on its inner side for sealing with the outer wall, and
- means including passageway means in the body connecting with its outer side between the first and second seal rings so that the fluid medium may be supplied from the port to the passageway means to the third seal ring for energizing it into sealing engagement with the outer wall.
2 more elements
Dependencies are inferred from the claim text.