Patent ID: 7832486
Filing Date: 2010-11-16
Classification: E21B

Abstract:
1. A gas lift valve, comprising: a longitudinally extending tubular body defining an inner volume and an inner diameter; a flow restrictor within the tubular body defining an opening there through having an inner diameter that is smaller than the inner diameter of the tubular body, thereby defining a first side of the flow restrictor and a second side of the flow restrictor; a valve part located on the first side of the flow restrictor, the valve part being movable between a first position and a second position, the first position being in contact with the flow restrictor thereby restricting flow through the flow restrictor, and the second position not being in contact with the flow restrictor and allowing flow though the flow restrictor, the valve part being actuated by pressure on the first side of the flow restrictor; an opening in the tubular body fluidly connecting an outside of the gas lift valve to an inside volume of the gas lift valve on the first side of the flow restrictor; a longitudinally extending tubular device located inside the tubular body on the second side of the flow restrictor, the tubular device being longitudinally movable inside the tubular body; a flow deflector located on the second side of the flow restrictor, the flow deflector being mechanically connected with the tubular device so that the flow deflector and the tubular body move in tandem; a flapper valve located within the tubular body and adjacent to an end of the tubular device that is distal from the flow restrictor, the flapper valve having a first closed position wherein the flapper valve covers an opening though the tubular body, and a second open position wherein the flapper valve allows flow though the tubular body; wherein when in the first position the tubular device is proximate to the flow restrictor thereby allowing the flapper valve into the first closed position covering the opening and when the tubular device is in the second position the tubular device extends though the opening and is distal to the flow restrictor thereby preventing the flapper valve from moving to the first closed position.