Casing hanger annulus monitoring system
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United States of America Patent
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-
Jul 11, 2006
Issued Date -
N/A
app pub date -
Jan 5, 2005
filing date -
Dec 28, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A subsea wellhead assembly has the capabilities of communicating from a tree assembly mounted on an inner wellhead housing to a casing annulus. A passage in the wellhead assembly extends within the bore of the wellhead housing from the casing annulus to the tree assembly. A portion of the passage is located within a casing hanger. The passage is opened and closed by a valve. The valve does not open the passage until the tree assembly is connected to the wellhead housing and a tubing hanger orientation sleeve lands in the wellhead assembly. The tubing hanger orientation sleeve actuates the valve when it lands to open the passage. When the passage is opened, the casing annulus is in fluid communication with the interior surface of the wellhead housing, which is in communication with the tree assembly. The valve can be located in the casing hanger, or in a bridging hanger
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