| 摘要 |
An artificial lift system for pumping fluid from a well using gas displacement. The system includes a pump (14, 24) with at least one chamber which is alternately allowed to fill with well fluid by venting gas from the chamber and passing a power gas into the chamber to displace the well fluid through a liquid string (18). The venting is through multi stage vents (21, 20) which allow a high pressure range to be vented directly to a third stage of a multi stage compressor (28, 37); and which allow a lower pressure range to vent to the wellbore (16), which is connected to the first stage (35) of the compressor (37).
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