| 摘要 |
Fluid pumping apparatus for pumping fluids from a well comprising a downhole pump disposed near the lower end of a production string and including a tubular pump barrel and a tubular pump plunger concentrically disposed in the pump barrel in a sliding and sealing fit therewith, one of the pump barrel and the pump plunger being fixed to the production string, the other being attached to the lower end of a string of rods for reciprocal movement. A standing valve is provided in the fixed one of the pump barrel and the pump plunger. A traveling valve is provided in the other. A cylindrical polished rod, the lower end of which is connected to the string of rods, extends upwardly through a sealing assembly for sliding and sealing reciprocation therethrough, the diameter of the polished rod being at least as great as the outside diameter of the pump plunger. A power device is operatively connected to the polished rod for lifting and lowering the polished rod and the string of rods and lift the lower the nonfixed one of the pump barrel and the pump plunger between lower and upper terminal positions, pushing fluids upwardly through the production string on the downstroke of the pump.
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