Isolation valve with frangible flapper element

Details Isolation valve with frangible flapper element Isolation valve with frangible flapper element

1986-03-25

1987-09-08

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Destructible element

166325, E21B 3410

Patent

active

046917756

ABSTRACT:
An isolation valve that may be inserted in the casing of a subterranean well at a position above a production formation and operated to a closed position upon the withdrawal of the mandrel and wash tube commonly employed for effecting the gravel packing of the screen and production formation. The valve has a frangible flapper piercable by mechanical means or by increased pressure after removal of the wash tube.

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patent: 4457376 (1984-07-01), Carmody et al.
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