| 摘要 |
A crude oil recovery system includes a downhole pump and an extension that extends below the downhole pump. The extension has an extension inlet positioned below the lowest drawdown level achievable by the pump. All of the fluid pumped by the downhole pump enters the extension via the extension inlet, and by positioning the extension inlet sufficiently below the lowest drawdown level achievable by the pump, pressurized gas is prevented from entering the extension, the pump, or the pump column above the pump. In this way, gas is prevented from displacing oil in the pump column, thereby maintaining excellent cooling for the polish rod, and gas is confined to the borehole annulus, where it can readily be recovered or vented.
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