Acoustically controlled electro-mechanical circulation sub

Details Acoustically controlled electro-mechanical circulation sub Acoustically controlled electro-mechanical circulation sub

1980-12-22

1983-02-15

Novosad, Stephen J.

Wells

With electrical means

166 72, 166321, 166374, E21B 3408, E21B 3416

Patent

active

043735827

ABSTRACT:
This invention relates to a self-contained circulation sub which may be operated upon control from the surface. It may be in the shape of a short section of drill collar and utilizes a sleeve valve to cover the circulation ports. Upon reception of an acoustic signal from the surface, a control valve directs fluid from the pipe bore onto a pressure face on the sleeve valve. The sleeve valve then moves down and exposes the circulation ports thereby allowing drilling fluids to pass from its interior to its exterior.

REFERENCES:
patent: 3233674 (1966-02-01), Leutwyler
patent: 3375874 (1968-04-01), Cherry et al.
patent: 3572434 (1971-03-01), Ecuer
patent: 3661205 (1972-05-01), Belorgey
patent: 3664415 (1972-05-01), Wray et al.
patent: 3850250 (1974-11-01), Holden et al.
patent: 3941190 (1976-03-01), Conover
patent: 3961308 (1976-06-01), Parker
patent: 4073341 (1978-02-01), Parker
patent: 4129184 (1978-12-01), Parker
patent: 4147222 (1979-04-01), Patten et al.

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