Patent ID: 6640902
Filing Date: 2003-11-04
Classification: E21B

Abstract:
A wellhead system which includes:a wellhead housing; a first casing hanger which is supported in the wellhead housing and from which a first casing string is suspended; a second casing hanger which is supported in the first casing hanger and from which a second casing string is suspended; a first casing annulus being formed between the wellhead housing and the first casing string, and a second casing annulus being formed between the first casing string and the second casing string; a first removable sealing member which is positioned between the first casing hanger and the wellhead housing; and a second removable sealing member which is positioned between the second casing hanger and the first casing hanger; wherein the first and second sealing members may be independently removed to provide selective access to the first and second casing annuli from above the first and second casing hangers.