| 摘要 |
Subsea wellhead assembly comprising a body 1 supporting isolation sleeve 39. Passageway 25 through the body provides communication between the isolation sleeve and annulus B. Valve 27 operated by fluid pressure supplied by way of the isolation sleeve controls communication through the passageway 25. Valve 27 can control communication between line 25 and a passageway 44 in the isolation sleeve. The body 1 may support a hanger for a production casing string. A further independent claim defines a subsea wellhead assembly with a cylindrical axial bore supporting casing hangers and a passageway between the annulus and port in the bore. A valve controls communication through the passageway. |
