SUBSEA CASING HANGER PACKOFF ASSEMBLY

A packoff assembly (26) for sealing an annulus between an inner tubular member (22) and an outer tubular member (10) including a sealing means (80) rotatably connected to a packing nut (82). The sealing means includes an upper actuation ring (100) rotatably retained on the packing nut. A sealing member (102) having a ring-like metal body is rotatably mounted on the upper actuation ring with a roller ball connection (84) which permits limited relative axial movement between the upper actuation ring and the sealing member. A lower actuation ring (104) is rotatably mounted on the body of the sealing member by another roller ball connection (106) which permits limited relative axial movement between the lower actuation ring and the body of the sealing member. The metal body of the sealing member includes a pair of frustoconical-shaped outer seal lips (136, 138) and a pair of frustoconical-shaped inner seal lips (140, 142). An elastomeric seal ring (128, 129) is disposed on the body of the sealing member between each pair of metal seal lips. The upper seal lips of each pair flare upwardly, and the lower seal lips of each pair flare downwardly. The faces of the upper and lower actuation rings which oppose the respective faces of the adjacent metal seal lips are frustoconical in shape and are sloped in directions opposite to those of the seal lips. There is a void space between such faces of the actuation rings and their respective adjacent metal seal lips.