Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting
Patent
1980-08-25
1982-02-16
Novosad, Stephen J.
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
175 71, 175212, 175218, E21B 1900, E21B 2110, E21B 3302
Patent
active
043155537
ABSTRACT:
An apparatus for maintaining a continuous supply of air pressure downhole during a well bore drilling operation, even during the addition of a pipe section to the drill string, and comprising a housing installed at the surface of the well at the position of the drilling equipment wherein the upper end of the drill string is separated from the drive mechanism in order that a new piece of drill pipe may be added to the drill string, a flapper or closure member pivotally secured within the housing normally held in an open position by the outer periphery of the drill string and spring urged in a direction toward the open end of the sleeve through which the drive mechanism passes when the drive mechanism has been backed off or removed for the addition of a section of pipe to the drill string, and a by-pass line in communication with the interior of the housing for directing air pressure from the air supply to the housing when the flapper member is in the closed position whereby the air pressure may be circulated downwardly through the drill string for maintaining the air circulation downhole during the entire drilling operation.
REFERENCES:
patent: 2712921 (1955-07-01), Redman
patent: 3788423 (1974-01-01), Nittinger et al.
patent: 3800890 (1974-04-01), Gyongyosi et al.
patent: 3946818 (1976-03-01), Ek
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