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US 5,183,268 AGranted
Metal-to-metal wellhead seal for rough casing
AssigneeFMC Corporation
InventorsHenry Wong, Ronald D. Quates, Lien-Yan Chen
Life of this patent
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Abstract
An annular metallic seal element for wellhead housings to provide a fluid-tight seal with a well casing that will withstand extreme temperatures and high pressures.
Claims13
A metal seal device for providing a fluid pressure metal-to-metal seal between a non-machined rough surface of a well casing and a surrounding wellhead component, the seal device constructed entirely of metal and comprising
- a) an annular all metal seal body having an upper end, a lower end, a cylindrical inner surface extending between said upper and lower ends, and an outer surface formed by a plurality of cylindrical surface portions having mutually different diameters;
- b) a plurality of axially-spaced annular internal ridges on the body inner surface, said ridges having sealing surfaces for establishing a metal-to-metal seal with a non-machined rough surface of a well casing;
- and
- c) a plurality of annular external sealing surfaces on the body outer surface, said external sealing surfaces axially positioned to reside on a straight line that slopes inwardly from the lower end of the body towards the body axis.
1 more element
Dependencies are inferred from the claim text.