Down-hole blow-out preventers

Details Down-hole blow-out preventers Down-hole blow-out preventers

1986-06-10

1987-12-15

Novosad, Stephen J.

Wells

Automatic

166 72, 166187, 166321, E21B 3406

Patent

active

047126132

ABSTRACT:
A down-hole blow-out preventer has a housing (10) which is engageable in a drill string and which has a ball-valve (13) pivotally mounted in the bore (11) of the housing. The ball-valve is rotated from an open to a closed position by means of a cooperating cam sleeve (20) which is moved downwardly when mud pressure in the borehole is exposed to the flanged end (22) of the cam sleeve, which occurs when a solenoid valve (26) opens up a passage (27) upon a signal being received by a down-hole unit (39).

REFERENCES:
patent: 3746097 (1973-07-01), Mott
patent: 4161215 (1979-07-01), Bourne, Jr. et al.
patent: 4420159 (1983-12-01), Wood
patent: 4422618 (1983-12-01), Lawson
patent: 4553589 (1985-11-01), Jennings et al.
patent: 4566478 (1986-01-01), Deaton

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