Production tree with multiple safety barriers
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United States of America Patent
Stats
-
Jul 20, 2004
Grant Date -
Jan 30, 2003
app pub date -
Jul 23, 2002
filing date -
Jul 27, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The wellhead assembly has a production tree with multiple safety barriers. A tubing hanger lands and seals in the bore of the tree. The tubing hanger has a lateral production flow passage that registers with a lateral passage in the tree. A tubing annulus passage extends upward from the tubing annulus to an exterior port. A second portion of the tubing annulus passage extends upward from the exterior port into the bore above the tubing hanger seal. The external port may be used for gas injection. If so, two closure members are located in the upper portion of the tubing annulus above the seal. The upper closure member may be either a check valve or a removable plug.
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Cited Art Landscape
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