Barrier orifice valve for gas lift

Wells – Processes – Producing the well

Reexamination Certificate

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C166S332800

Reexamination Certificate

active

07360602

ABSTRACT:
Gas lift valve designs and gas lift systems are described that feature a positive closure mechanism that is highly resistant to significant wear or damage that would result in fluid leakage. A pivotable flapper member is incorporated into a gas lift valve and used as a flow control mechanism. The flapper member provides a positive barrier to fluid flow from the production tubing to the annulus, even after substantial wear or damage.

REFERENCES:
patent: 2634689 (1953-04-01), Walton
patent: 4854387 (1989-08-01), Pringle
patent: 5004007 (1991-04-01), Johnson et al.
patent: 5971004 (1999-10-01), Pringle
patent: 6568473 (2003-05-01), De Almeida
patent: 6715550 (2004-04-01), Vinegar et al.
patent: 6810955 (2004-11-01), Roth et al.
patent: 6932581 (2005-08-01), Messick
patent: WO 2005/093209 (2005-10-01), None

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