Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1981-07-10
1983-11-15
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166332, 166324, E21B 3414
Patent
active
044150385
ABSTRACT:
A method and apparatus are provided for effecting the automatic closing of the bore of a subterranean well conduit upon the withdrawal of a tubular work string or production string from the conduit and the reopening of such bore upon the reinsertion of a tubular string. A biased shiftable valving element is held in an open position by an actuator sleeve which is operatively connected to an inserted tubular string so as to move with such string only a limited distance during either the insertion or the withdrawal movement thereof and permits the valving element to close when the inserted tubular string is withdrawn to prevent fluid remaining in the well from draining into the formation. When the shiftable valve is in a closed position, fluid conduit means divert any fluid pressure building up above the closed position of the valve to a piston element, disposed below the valve, which produces a force on the valve opposing the effects of such pressure build up and maintaining the valve in the closed position until the subsequent insertion of a tubular work string or production string.
REFERENCES:
patent: 3151839 (1964-10-01), Mott
patent: 3306363 (1967-02-01), McZilkey, Jr.
patent: 3703193 (1972-11-01), Raulins
patent: 3799204 (1974-03-01), Watkins et al.
patent: 4018284 (1977-04-01), Perkins
patent: 4077473 (1978-03-01), Watkins
patent: 4105069 (1978-08-01), Baker
patent: 4230185 (1980-10-01), Fredd
Baker International Corporation
Neuder William P.
Norvell, Jr. William C.
Novosad Stephen J.
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