| 摘要 |
A subsea wellhead and completion system which provides for monitoring pressure in the annulus of the production casing through communication passages that are pressure-isolated from tubing annulus passages and production fluid passages. The communication passages route production casing annulus fluid pressure from the production casing annulus through the production casing hanger to a communication passage provided between the wellhead housing and an isolation sleeve that spans and seals between the production casing hanger and the tree and then through the tree to an outlet on external diameter of the tree and thence to monitoring equipment located typically at the rig. A removable closure member is located in the production casing hanger to isolate the communication passage during drilling operations. This closure member is removed after drilling operations are concluded and after the tree is installed, but before the isolation sleeve and tubing hanger are landed.
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