| 摘要 |
A gas flow control device (60) for injecting gas into a downhole production string for recovering pressure and reducing frictional losses, so that critical flow can be reache d at lower pressure drops and higher production pressure, includes a housing, inlet ports (54), nose end ( 61) with check valve (65), and outlet ports (64), and a nozzle (34) having first and second ends, and a flow path therebetween, and a Venturi having first and second ends, and a flow path therebetween. Th e first end of the Venturi portion is disposed adjacent to the second end of the nozzle. The Ve nturi flow path is coaxially aligned with the nozzle flow path to provide a continuous flow pat h therethrough. Such a flow control device that has a gas flow rate performance that is independent of the tubing pressure, even when the tubing pressure is as high as 80 % to 93 % of the casing press ure, can be used to increase the production rate, improve the lift efficiency, and eliminate or suppress instability in continuous-now gas lift wells.
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