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A seal assembly for a wellhead housing and wellhead connector will seal even if the primary sealing surface becomes damaged. The wellhead connector and the wellhead housing each have primary sealing surfaces. A seal ring with upper and lower conical surfaces will seal against the surfaces of the wel

A seal assembly for a wellhead housing and wellhead connector will seal even if the primary sealing surface becomes damaged. The wellhead connector and the wellhead housing each have primary sealing surfaces. A seal ring with upper and lower conical surfaces will seal against the surfaces of the wellhead connector and the wellhead housing. The wellhead housing also has a secondary sealing surface that extends down from the primary sealing surface. In the event that the primary sealing surface becomes damaged, a seal is utilized that has a support section and a lower seal surface. The support section does not sealingly contact the damaged primary seal surface on the wellhead housing. The lower seal surface engages the secondary seal surface of the wellhead housing to perform sealing.

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In a wellhead housing of a type having a bore with an axis and an upward facing shoulder on its upper end, a wellhead connector adapted to connect to the wellhead housing and having a bore and a downward facing shoulder for contact with the upward facing shoulder, the wellhead connector having a rec

In a wellhead housing of a type having a bore with an axis and an upward facing shoulder on its upper end, a wellhead connector adapted to connect to the wellhead housing and having a bore and a downward facing shoulder for contact with the upward facing shoulder, the wellhead connector having a recess located radially inward from the downward facing shoulder and a seal surface which extends upward and is inward from the recess, an improved apparatus for sealing the wellhead connector to the wellhead housing at the upward and downward facing shoulders, comprising in combination: a primary seal surface extending downward from the upward facing shoulder of the wellhead housing and radially inward relative to the axis of the bore; a secondary seal surface extending downward from the primary seal surface of the wellhead housing, the primary seal surface intersecting the secondary seal surface at an obtuse angle, the secondary seal surface having a lower marginal edge; a transition surface extending inward from the lower marginal edge of the secondary seal surface to the bore of the wellhead housing; an annular seal ring for use if the primary seal surface of the wellhead housing is damaged, comprising: a upper seal surface in sealing contact with the seal surface of the wellhead connector; a support section which is positioned adjacent the primary seal surface in the wellhead housing to prevent sealing contact with the primary seal surface; a lower seal surface extending below the support section and which contacts the secondary seal surface in the wellhead housing in sealing engagement; and a rib extending radially outward from the support section into the recess.