Downhole valve for oil/gas well

Details Downhole valve for oil/gas well Downhole valve for oil/gas well

1991-11-18

1996-03-19

Novosad, Stephen J.

Boring or penetrating the earth

With means movable relative to tool or shaft to control...

166154, 166318, E21B 3414

Patent

active

054996872

ABSTRACT:
A downhole drilling device utilizing a spring-loaded sleeve within a casing for controlling circulation of fluid material. A plastic, i.e., deformable ball is used to block a flow opening in the sleeve for positioning the sleeve and aligning flow ports. Subsequently, the ball is deformed and the drilling operation continues. In one form, an expandable packer may be operated to close off the annulus about the casing.

REFERENCES:
patent: 2862562 (1958-12-01), Hughes
patent: 2946565 (1960-07-01), Williams
patent: 3007523 (1961-11-01), Vincent
patent: 3422673 (1969-01-01), Lebourg
patent: 3503445 (1970-03-01), Cochrum et al.
patent: 3542130 (1970-11-01), Stout
patent: 3606924 (1971-09-01), Malone
patent: 3878889 (1975-04-01), Seabourn
patent: 3908769 (1975-09-01), Schuyf et al.
patent: 4574894 (1986-03-01), Jadwin

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