| 摘要 |
A subsea wellhead assembly for a subsea well includes a low pressure wellhead housing 11 having a string of conductor piping 13 extending therefrom. A high pressure wellhead housing 15, having a string of outer casing 17 suspended therefrom, lands within the low pressure wellhead housing. An adapter 27 is positioned within a bore of the high pressure housing. The adapter has an external load shoulder that lands on a housing load shoulder 21 of the high pressure wellhead housing. The adapter also has an adapter bore with an inner adapter load shoulder formed thereon. A casing hanger 43 is carried in the adapter bore, and has a string of inner casing 45 suspended therefrom and is cemented in the well. The casing hanger lands on the inner adapter load shoulder. The adapter allows smaller diameter casing to be hung in the standard bore of the wellhead, creating advantages of flexibility for the drill operator. |
