Well drilling float valve

Details Well drilling float valve Well drilling float valve

1980-12-17

1983-04-05

Cohan, Alan

Fluid handling

Line condition change responsive valves

Direct response valves

137463, 251 82, 166325, F16K 2104

Patent

active

043788181

ABSTRACT:
A float valve for use with drill pipe or drill casing or the like in a well is provided wherein a valving flapper can be set in a partially open position while lowering the drill pipe or drill casing into a well thereby allowing the drill pipe or casing to fill with drilling mud or fluid thus preventing inadvertent collapse of the drill pipe or the drill casing. Once the drill string and the valve are fully in the hole, the valving flapper moves, responsive to circulation through the valve bore, from the partially open position to a fully open position allowing the valve flapper to freely pivot thereafter within the provided valve body between fully open and fully closed positions. The valve flapper is thus free to close in a back pressure situation or due to a blowout or for any such other reason. During circulation of drilling fluids or the like, the flapper is maintained in an open flow condition.

REFERENCES:
patent: 2162578 (1939-06-01), Hacker
patent: 2587358 (1952-02-01), McRae
patent: 2694408 (1954-11-01), McRae
patent: 3058534 (1962-10-01), Keithahn
patent: 4117860 (1978-10-01), Carlin

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