Gas lift system
Where more than one productive formation is penetrated by a well, use of the annulus to conduct the lifting gas and the tubing to conduct the lifted liquids is precluded if segregation of produced fluids is to be maintained. In this situation, existing systems require an additional string of tubing, so that 3 separate passages are available for the lifting gas and the segregated produced fluids. A gas-lift system is described which alleviates the problems outlined. The system utilizes an annular chamber between the tubing and the casing into which the produced fluids are directed. After production has accumulated in this chamber for a sufficient period of time, high-pressure gas is injected down the tubing string and into the upper part of the chamber. The tubing is then vented into a low-pressure liquid gathering line, causing the gas stored in the upper part of the chamber to expand and force the liquid from the chamber up the tubing to the surface. (13 claims)
- Assignee:
- Esso Production Res Co
- Patent Number(s):
- US 3482526
- OSTI ID:
- 6677409
- Country of Publication:
- United States
- Language:
- English
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