CPC E21B 43/123 (2013.01) [E21B 34/10 (2013.01)] | 20 Claims |
1. A gas-lift valve comprising:
a valve housing at least in part defining a chamber for receiving an actuation fluid; and
a flow restrictor having a position that is controllable by adjusting a downhole pressure in a wellbore to cause a phase change of the actuation fluid by changing a density of the actuation fluid in the chamber.
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