Well tool hydrostatic release means

Details Well tool hydrostatic release means Well tool hydrostatic release means

1989-07-31

1990-12-11

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166324, 166375, E21B 3410, E21B 4312

Patent

active

049763172

ABSTRACT:
A release mechanism for use in a well tool that requires a hydraulic piston area to be equalized with a minimum force. A valve seat and valve element are positioned in a fluid passageway for actuating the assembly. A rod having a first and second section is connected to the assembly and movable for moving the second section into the valve seat. The second section has a smaller cross-sectional area and smaller length than the first section. The area of the valve seat is less than the cross-sectional area of first section but larger than the second section. The release mechanism allows the sealing area to be reduced without reducing the strength of the rod.

REFERENCES:
patent: Re32390 (1987-04-01), Pringle
patent: 2909227 (1959-10-01), Bostock
patent: 4161219 (1979-07-01), Pringle
patent: 4373587 (1983-02-01), Pringle
patent: 4376464 (1983-03-01), Crow
patent: 4569398 (1986-02-01), Pringle
patent: 4629002 (1986-12-01), Pringle
patent: 4660646 (1987-04-01), Blizzard
patent: 4722399 (1988-02-01), Pringle
patent: 4791990 (1988-12-01), Amani

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