| 摘要 |
A gas lift valve of the unloading type having a main valve for controlling fluid flow between a well casing and a well tubing, a volume of compressible liquid a spaced distance from said main valve and subject to casing pressure, and a pilot valve between the main valve and the compressible liquid for controlling opening and closing of the main valve by permitting casing pressure to act thereon or to isolate it therefrom as the volume of the compressible liquid changes in response to changes in casing pressure to which it is subjected. Gas lift well systems utilizing such gas lift valves and methods for operating such gas lift well systems are also disclosed.
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