Inside blowout preventer well tool

Details Inside blowout preventer well tool Inside blowout preventer well tool

1979-12-31

1981-10-13

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Operated by dropped element

166321, 137494, 251 58, E21B 4300, F16K 3163

Patent

active

042943140

ABSTRACT:
An inside blowout preventer well tool includes an elongated body threaded at both ends and including an axial opening. A flapper is pivotally mounted on a side of the opening and movable between a lower-open position and an upper-closed position. A downwardly-facing valve seat is formed around the opening, the flapper engaging the seat in the upper-closed position. A spring urges the flapper toward the seat and a piston is movable in the opening between an upper position, where the lower end of the piston is above the valve seat, and a lower position, where the piston encases the flapper and holds it in the lower-open position. The piston is normally urged toward its upper position, the piston being shaped so that when the internal pressure of drilling mud normally circulating through the opening is greater by a predetermined amount than pressure outside the body, the pressure differential will overcome the force urging the piston upwardly and move the piston to the lower position. The piston is also responsive to fluid pressure outside the body so that the piston will automatically be moved to its upper position when the pressure differential is reduced by a predetermined amount.

REFERENCES:
patent: 2162578 (1939-06-01), Hacker
patent: 2921601 (1960-01-01), Fisher, Jr.
patent: 2944793 (1960-07-01), Conrad
patent: 3318387 (1967-05-01), Jones
patent: 3788594 (1974-01-01), Mott
patent: 4154303 (1979-05-01), Fournier

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