Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1991-02-22
1992-10-20
Melius, Terry Lee
Wells
Valves, closures or changeable restrictors
Fluid operated
166332, E21B 3406
Patent
active
051562090
ABSTRACT:
In a downhole assembly (1) including an outer casing or mandrel (2), an axially movable prong (11) in the mandrel, and means for equalizing pressure within the mandrel (1) comprising a fluid duct (7) communicating the interior of the mandrel with the outside and a control member (or melon) (8) movable by the prong to control fluid flow via said duct (7); there is provided apparatus for controlling movement of the prong (11) comprising radially movable arrester dogs (14) engagable with a rib (20) on the prong (11) and an annular piston device (15) located in a housing (16) adapted for operative movement of the dogs (14). In particular housing zones on either side of the piston device (15) are maintained at tool external and mandrel internal pressure respectively whereby the piston device (11) is moved to lock the prong (11) when there is a pressure imbalance but free the prong (11) when pressure equilibrium is reached.
REFERENCES:
patent: 3151681 (1964-10-01), Cochran
patent: 3750751 (1973-08-01), Mott
patent: 4460040 (1984-07-01), Bowyer
Melius Terry Lee
Petroline Wireline Services Ltd.
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