CASING HANGER LOCKDOWN WITH CONICAL LOCKDOWN RING

摘要

Casing Hanger Lockdown with Conical Lockdown Ring Abstract of the Disclosure A seal (17) seals an annulus (15) in a subsea assembly between a wellhead (13) and a casing hanger (11) landed on a shoulder within a bore of the wellhead (13). The seal (17) includes a casing hanger seal ring (21) disposed within the annulus (15). The seal ring (21) engaged with an inner diameter surface of the wellhead (13), and engaged with an outer diameter surface of the casing hanger (1H) so that the seal ring (21) prevents flow through the annulus (15). A nose ring (23) is secured to a lower end of the seal ring (21) so that, when the seal ring (21) is energized, a conical surface (46) of the nose ring (23) engages a mating conical profile (48) formed in the inner diameter surface portion of the wellhead (13) and the nose ring (23) engages a surface opposite the conical surface (46) with an outer diameter surface portion of the casing hanger (11) to limit upwards axial movement of the casing hanger (11). r-114 ig. 1 67-j messoo " vM