The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 28, 1999
Filed:
Oct. 06, 1995
Don B Wafer, Spring, TX (US);
FMC Corporation, Chicago, IL (US);
Abstract
A system for sealing a wellhead, the system comprising: a wellhead housing for connecting to a well string casing, the wellhead housing being annularly disposed about a central axis comprising: a primary sealing surface disposed within the wellhead housing; a reference surface extending below the primary sealing surface; and a secondary sealing surface extending below the reference surface; a wellhead connector annularly disposed about the central axis having disposed therein a connector sealing surface; and a secondary seal ring annularly disposed about the central axis and comprising: a ring seal surface for sealing contact with the connector sealing surface; and an extension extending below the ring seal surface and having disposed thereon a sealing land extending from a lower portion of the extension for sealing contact with the wellhead housing. A system for sealing a wellhead, the system comprising: a wellhead housing annularly disposed about a central axis comprising: a primary sealing surface disposed within the wellhead housing; a secondary sealing surface extending below the primary sealing surface; and a lever point; and a wellhead connector annularly disposed about the central axis and having disposed therein a connector sealing surface; and a secondary seal ring annularly disposed about the central axis and comprising: a ring seal surface for sealing contact with the connector sealing surface; a sealing land for sealing contact with the wellhead housing; and a lever contact point for engagement with the lever point about which compressive forces imposed by the wellhead housing and the wellhead connector generate a moment which energizes the sealing land.