Patent ID: 9546541
Date: 2017-01-17
CPC Classifications: E21B

Claim:
1. A gas lift valve comprising: a pressurizable chamber; a first plunger that comprises a chamber end that extends into the pressurizable chamber; a first bellows that biases the first plunger; a second plunger that comprises an end operatively coupled to the first plunger; a second bellows that biases the second plunger; a valve plug operatively coupled to the second plunger; and a crossover valve housing that defines at least in part a casing fluid passage, that defines at least in part a tubing fluid passage and that comprises a valve seat for seating the valve plug, wherein a transition from a closed operational state to an open operational state of the valve plug with respect to the valve seat depends in part on a pressure in the pressurizable chamber and a ratio of an effective area of the first bellows to an effective area of the second bellows.