WELLHEAD ASSEMBLY WITH PRESSURE ACTUATED SEAL ASSEMBLY AND RUNNING TOOL

摘要

A subsea well assembly includes a wellhead housing (50) having a cylindrical inner sealing surface and a tubular hanger (10) having a tapered external sealing surface. The running tool (30) includes a central stem (40) connected to the running string. A setting piston (72) is responsive to fluid pressure in the annulus about the running string, and has a radially outer surface and a radially inner surface each for sealing with the running tool body. Fluid pressure to set the seal assembly may be applied to the setting piston through an annulus about the running string, and may also act directly on an initially set seal assembly (20).