Gas lift valve apparatus
Patent
·
OSTI ID:5005459
A pilot gas-lift valve is differentially actuated, responsive to the tubing pressure, and cannot be actuated by casing pressure alone. The valves can be employed on multiple strings of tubing in a single casing wherein a number of valves are on different strings but at the same casing pressure. In this situation, each valve can still be individually opened as required by increases in tubing pressure in each string. The valve employs a bellows means, pilot valve, and a power valve, the pilot valve being unconnected with the bellows means and differentially operated with a spring assist. (6 claims)
- Assignee:
- Dresser Industries Inc.
- Patent Number(s):
- US 3722527
- OSTI ID:
- 5005459
- Country of Publication:
- United States
- Language:
- English
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