Subsea master valve for use in well testing

Details Subsea master valve for use in well testing Subsea master valve for use in well testing

1985-05-31

1987-04-21

Novosad, Stephen J.

Wells

Submerged well

Testing

166319, 166374, 13761419, F21B 3404, F21B 3410

Patent

active

046589040

ABSTRACT:
In accordance with illustrative embodiments of the present invention, a new and improved subsea test tree includes a hydraulically operable control unit and shut-in valve unit that are releasably latched together. The control unit includes an integral retainer valve system at the upper end thereof. The main shut-in valve, which is a ball valve, is a fail-close device under the influence of a spring and nitrogen pressure. Additional assistance in closing the valve may be provided if needed by hydraulic pressure applied to a surface control line. Internal pressure may be vented prior to unlatching the control unit in case of an emergency.

REFERENCES:
patent: 3967647 (1976-07-01), Young
patent: 4009753 (1977-03-01), McGill et al.
patent: 4253525 (1981-03-01), Young
patent: 4256282 (1981-03-01), Goldschild et al.
patent: 4399870 (1983-08-01), Baugh et al.
patent: 4415027 (1983-11-01), Russell
patent: 4494609 (1985-01-01), Schwendemann

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