Fire-safe surface-controlled subsurface safety valve control line/wellhead connector and blowout preventer
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United States of America Patent
Stats
-
Nov 19, 1985
Grant Date -
N/A
app pub date -
Jul 12, 1984
filing date -
Jul 12, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The existance of fire at or near an oil field wellhead is sensed by a eutectic body which holds a valve system in a cocked position. When the eutectic is melted, the valves are positioned to terminate communication of a hydraulic fluid pressure source with a downhole safety valve and open a bleed conduit connected with the conduit to the downhole valve. A second eutectic body will melt at a different temperature than the first, providing a second position for the valve system which closes the conduit to the downhole valve and atmosphere to give positive isolation from the oil well fluid.
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