Wells – Screens – Porous material
Patent
1975-01-20
1976-11-09
Leppink, James A.
Wells
Screens
Porous material
E21B 3303, E21B 4312
Patent
active
039905110
ABSTRACT:
A safety valve system for use in a well having a tubing string for conducting well fluids to the surface, a landing nipple secured in the tubing string for the releasable engagement of a well tool locking mandrel, a sliding sleeve valve connected in the tubing string below the landing nipple and provided with a side port controlled by a sliding sleeve and communicating with a control fluid line extending to the surface, and a safety valve tool string including a locking mandrel releasably supported in the tubing string at the landing nipple, a sleeve shifting device connected with the locking mandrel for opening and closing the sliding sleeve valve when installing and removing the safety valve tool string, and a well safety valve supported from the sleeve shifting device and operable responsive to control fluid pressure introduced into the tubing string through the side port in the sleeve valve. Well safety valves of the ball type, poppet type, and flapper type are disclosed for use in the safety valve tool string. The sliding sleeve valve is opened when the safety valve tool string is introduced into operating position within the tubing string. The sleeve valve is closed when the tool string is removed from the tubing.
REFERENCES:
patent: 2949963 (1960-08-01), McGowen et al.
patent: 3073392 (1963-01-01), Dinning et al.
patent: 3166128 (1965-01-01), Myers
patent: 3292706 (1966-12-01), Grimmer et al.
patent: 3777813 (1973-12-01), Dendy et al.
patent: 3786863 (1974-01-01), Tausch
patent: 3860066 (1975-01-01), Pearce
Garland H. Mathews
Leppink James A.
Otis Engineering Corporation
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