Downhole flow control apparatus, operable via surface...

Details Downhole flow control apparatus, operable via surface... Downhole flow control apparatus, operable via surface...

2008-04-29

2008-04-29

Bagnell, David J. (Department: 3672)

Wells

Valves, closures or changeable restrictors

Fluid operated

C166S323000, C166S332800, C166S386000

Reexamination Certificate

active

11409315

ABSTRACT:
Flow control apparatus, for placement in a downhole location in the tubing string of a well. The apparatus comprises a valve element and a lock element. Application and removal of annulus pressure (on the annulus between the tubing and the casing) permits the apparatus to be cycled between a sensitive-to-flow mode, in which it opens to permit fluids to be injected down the tubing into a subsurface formation, but closes to prevent fluid backflow from the subsurface formation into the tubing; and an insensitive-to-flow mode, in which the apparatus is open to permit unimpeded fluid flow in either direction.

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