Safety gate valve for petroleum wells, permitting operation by a

Details Safety gate valve for petroleum wells, permitting operation by a Safety gate valve for petroleum wells, permitting operation by a

1987-10-15

1989-06-06

Dang, Hoang C.

Wells

Valves, closures or changeable restrictors

Fluid operated

166 68, 166212, 166237, 166322, 166372, E21B 3410, E21B 2304, E21B 4300

Patent

active

048362875

ABSTRACT:
The invention relates to a safety valve for oil wells, able to permit artificial output operation by injection of a fluid under pressure. This valve comprises a movable closing flap (11), a tubular internal slide (9), a spring (10) for returning said slide to its upper position, a hydraulic system for displacing said slide downwardly due to pressure of a control fluid, an internal tube (300) for passage of injected fluid, fixed to the slide (9), a lower connecting sleeve of a series of lower tubes (Ti) for the passage of injected fluid, able to be connected with the internal tube (300) when the tube is in the lower position, an upper connecting sleeve (309) of a series of upper tubes for the passage of injected fluid, in which may slide in a sealed manner the internal tube, a system for anchoring the valve in a receiving sleeve (1) comprising a hydraulically actuated mechanical system controlled by the control fluid, and seals (15, 16) at the contact of the receiving sleeve (1).

REFERENCES:
patent: 4474234 (1984-10-01), Lefebvre et al.
patent: 4478288 (1984-10-01), Bowyer
patent: 4479539 (1984-10-01), Tamplen et al.
patent: 4480697 (1984-11-01), Goldanigar
patent: 4597446 (1986-07-01), Helderle
patent: 4729433 (1988-03-01), Jacob
patent: 4776399 (1988-10-01), Jacob

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