Blow-out prevention device for shutting off an annulus between a

Details Blow-out prevention device for shutting off an annulus between a Blow-out prevention device for shutting off an annulus between a

1993-10-14

1995-04-11

Neuder, William P.

Wells

Submerged well

With safety or emergency shutoff

166184, 166 84, 175 24, 175243, E21B 2306

Patent

active

054049539

ABSTRACT:
A blow-out prevention device shuts off an annulus between a drill column and a well wall by means of an expandable sealing device when an unwanted blow-out of fluid and/or gas takes place from an unstable geological well formation when drilling for oil or gas.
When a blow-out takes place, a compressive-pulse code is activated in the inlet of the drill column and is transmitted through the drilling fluid to a pressure sensor which transmits the compressive-pulse code on to a microprocessor (37) which is preprogrammed with the pressure code. If the pressure codes coincide, an electric motor is activated, which, via a set of gears and a nut-and-bolt device, displaces a valve plate axially towards a valve seat. The drilling fluid then flows out through nozzles and causes a large pressure drop which is used to expand the sealing device so that the annulus is shut.

REFERENCES:
patent: 3322215 (1967-05-01), Warrington
patent: 3503445 (1970-03-01), Cochrum et al.
patent: 3741294 (1973-06-01), Morrill
patent: 3853177 (1974-12-01), Mott
patent: 4367794 (1983-01-01), Bednar et al.
patent: 4391331 (1983-07-01), Shotbolt
patent: 4463814 (1984-08-01), Horstmeyer et al.
patent: 4558744 (1985-12-01), Gibb
patent: 4561499 (1985-12-01), Berner, Jr. et al.
patent: 4612993 (1986-09-01), Moore
patent: 4712613 (1987-12-01), Nieuwstad

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