Fire-safe surface-controlled subsurface safety valve control lin

Details Fire-safe surface-controlled subsurface safety valve control lin Fire-safe surface-controlled subsurface safety valve control lin

1984-07-12

1985-11-19

Novosad, Stephen J.

Wells

Automatic

137 72, 166317, 166363, 166 751, E21B 3410, E21B 3416

Patent

active

045535892

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.

REFERENCES:
patent: 3618627 (1971-11-01), Wagner
patent: 3659624 (1972-05-01), Kelly et al.
patent: 4422503 (1983-12-01), Goans

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