Wells – Valves – closures or changeable restrictors
Patent
1979-07-26
1981-02-24
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
166113, 166133, 166264, 166319, 166332, E21B 3410, E21B 3414, E21B 4312, E21B 4706
Patent
active
042521955
ABSTRACT:
A well packer and depending foot valve are landed in a well. A landing nipple depends from the foot valve. A tubing string sealingly engages the packer and includes a circulating valve. A transducer-valve fitting may be run with the packer foot valve assembly or it may be run at a later time and landed in the landing nipple. The foot valve is operated by an actuator which is positioned above the packer and is exposed to the casing tubing annulus as well as tubing pressure. The circulating valve is also exposed to casing-tubing and tubing pressure. The foot valve is controlled by the differential in pressures as is the circulating valve. A transducer may be landed in the transducer fitting and by selectively opening and closing the foot valve data may be taken from the well during both flow and non-flow conditions. After testing is completed the transducer and transducer fitting may be removed and a plug inserted in their place permitting flow thereafter through the foot valve which acts as a subsurface safety valve.
REFERENCES:
patent: 2715441 (1955-08-01), Bouvier
patent: 3152639 (1964-10-01), Pearcy
patent: 3356140 (1967-12-01), Young
patent: 3433301 (1969-03-01), McEver, Jr.
patent: 3572434 (1971-03-01), Ecuer
patent: 3860066 (1975-01-01), Pearce et al.
patent: 4050512 (1977-09-01), Giebeler
patent: 4059153 (1977-11-01), Nix et al.
patent: 4063593 (1977-12-01), Jessup
patent: 4064937 (1977-12-01), Barrington
patent: 4159643 (1979-07-01), Watkins
Novosad Stephen J.
Otis Engineering Corporation
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