Drill string shutoff valve

Details Drill string shutoff valve Drill string shutoff valve

2006-08-15

2006-08-15

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

Automatic control

Of fluid pressure below ground

C175S038000, C175S318000

Reexamination Certificate

active

07090033

ABSTRACT:
A valve assembly connects into a drill string for opening and closing at least one inner passage within the drill string of the drill string. The valve assembly includes an annular valve assembly carried in an annular passage that moves between the open and closed positions in response to downward fluid pressure from the surface through the annular passage. The valve assembly also includes an inner valve assembly carried in an inner passage of the drill string. The inner valve assembly is a two-way valve that is actuated between open and closed positions by pressure pulses from the surface through the inner passage. The valve assembly can be used within coiled tubing.

REFERENCES:
patent: 3970335 (1976-07-01), Curington et al.
patent: 4462472 (1984-07-01), Beimgraben
patent: 4936397 (1990-06-01), McDonald et al.
patent: 6601652 (2003-08-01), Moore et al.
patent: 6935423 (2005-08-01), Kusmer

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