| 摘要 |
The present invention is a surface controlled gas lift valve designed for hi gh flow rates and used in a subterranean well, comprising: a valve and actuating assembly for sealable insertion in a mandrel. The valve has a variable orifice which alternately permits, prohi bits, or throttles fluid flow into the valve, and a detachable and/or remote actuator are disclosed. The valve may be actuated using momentary bursts of hydraulic pressure to the actuating assem bly. Variable orifice opening settings are achieved by providing successive bursts of hydraulic pr essure to the actuating assembly, which cause a cylindrical cam within the actuating assembly to be indexed between multiple support positions. The orifice valve and the actuator while operati vely connected, may be separately installed in or retrieved from the mandrel by either wireline or coiled tubing intervention methods.
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