Control line blow out preventer

Details Control line blow out preventer Control line blow out preventer

1981-11-04

1983-12-27

Purser, Ernest R.

Wells

Automatic

166 64, 166 97, 137 73, 137 74, 137 75, 137496, 137553, 91394, E21B 3306

Patent

active

044225032

ABSTRACT:
An improved control line blow out preventer valve is provided, having a fluid pressure chamber interposed in a control line extending from a surface control panel to a downhole safety valve in a subterranean well. Axially spaced inlet and outlet openings are provided in the pressure chamber and a piston is reciprocally mounted intermediate the inlet and outlet openings. A sealing plug carried by the piston cooperates with a seal surrounding the inlet opening. A bypass passage through the piston mounts a check valve which permits free fluid flow in the direction from the control panel to the subsurface safety valve but only a restricted fluid flow in the opposite direction. A check valve is mounted in the outlet passage to prevent fluid flow from the subsurface safety valve to the control panel. A fusible link normally maintains this check valve off its seat so that it does not close until the occurrence of an elevated temperature caused by fire. At the inlet port a bleed valve which is thermally activated is incorporated in order to bleed off the safety valve, or other apparatus, pressure in the event of a fire.

REFERENCES:
patent: 2774366 (1956-12-01), Dado
patent: 2940470 (1960-06-01), Morgan
patent: 3238850 (1966-03-01), Desmarchelier
patent: 3289686 (1966-12-01), Tyer, Jr.
patent: 4202368 (1980-05-01), Akkerman et al.
patent: 4270849 (1981-06-01), Kalbfleisch
patent: 4290440 (1981-09-01), Sturgis
patent: 4364407 (1982-12-01), Hilliard

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