Subterranean well casing float tool

Details Subterranean well casing float tool Subterranean well casing float tool

1989-08-14

1990-09-04

Novasad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

1375153, 1375155, E21B 3408, F16K 1500

Patent

active

049536222

ABSTRACT:
A subterranean well casing float tool has a tubular metal housing which is securable to well casing conduit. A valve is carried within the housing and comprises a frame with a valve head and seat carried relative to the frame and biased toward closed position. A compartment includes the valve head for enclosure around a bias, such as a spring, when the valve head is moved away from the valve seat. The valving components are directly secured to the housing by threads having profiled shear surfaces such that the shear area of the valving members is substantially greater than that of the housing.

REFERENCES:
patent: 4442894 (1984-04-01), Callihan et al.
patent: 4515218 (1985-05-01), Bissonnette
patent: 4624316 (1986-11-01), Baldridge et al.
patent: 4712619 (1987-12-01), Stepp et al.
The Condensed Chemical Dictionary, Eighth Edition, 1971, Van Nostrand-Reinhold Co., N.Y., p. 865.

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