Well apparatus

Details Well apparatus Well apparatus

1984-10-22

1987-02-10

Leppink, James A.

Wells

Central chamber sealed with respect to prepositioned...

Surrounding conduit carries packer or plug

166126, 166133, 166143, 166324, 166332, E21B 3312, E21B 3410

Patent

active

046417079

ABSTRACT:
Well apparatus is disclosed in which the bore through a lower tubular body adapted to be packed off and anchored within a well bore is opened and closed by a flapper pivotally mounted on the lower body and spring pressed toward closed position, and a flow tube mounted for reciprocation within the bore of an upper tubular body releasably connected to the lower body extends downwardly through the bore of the upper and lower bodies to a position for engaging and moving the flapper to open position, as the flow tube is lowered by means of control fluid supplied to a pressure responsive operator connected to the flow tube, and permitting the flapper to close as the control fluid is exhausted from the operator.

REFERENCES:
patent: 2971581 (1961-02-01), Reglin
patent: 2984303 (1961-05-01), Baker
patent: 3040811 (1962-06-01), Pistole et al.
patent: 3375874 (1968-04-01), Cherry et al.
patent: 3967647 (1976-07-01), Young
patent: 4031955 (1977-06-01), Ledet
patent: 4376464 (1983-03-01), Crow
patent: 4407363 (1983-10-01), Akkerman
patent: 4452311 (1984-06-01), Speegle et al.

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