Seal assembly for a casing hanger

摘要

A seal assembly for use with a casing hanger that includes a pair of split rings held together by a threaded fastener. Torqueing the fastener axially compresses one of the rings so that it expands radially inward into sealing engagement with a wall of wellbore casing, and radially outward against an inner wall of a wellhead housing. Support grommets are provided where the fastener enters and exits the compressible ring. Protrusions on a side of the support grommets project into the compressible ring and create a sealing interface between each support grommet and compressible ring. O-rings line inner circumferences of the support grommets to seal between the support grommets and fasteners. A threaded end on a lower end of the fastener has a diameter less than an inner diameter of the O-rings to prevent damaging the O-rings during assembly.

主权项

1. A seal assembly for use with a casing hanger comprising:
an upper ring; a lower compressible ring coaxially disposed with the upper ring; a bore axially extending through the upper ring and compressible ring; an elongated fastener inserted in the bore having threads on a lower end; first and second annular support grommets on opposing surfaces of the compressible ring, the first and second support grommets each comprising, an aperture registered with the bore and a protrusion projecting into the compressible ring, so that when the fastener is torqued to axially compress the lower compressible ring, a sealing interface is formed between the first and second support grommets and the lower compressible ring; and O-rings in sealing contact between the fastener and inner surfaces of the first and second support grommets, and that each have an inner diameter greater than an outer diameter of the lower end of the elongated fastener.