| 摘要 |
A full flow tubing stationary valve pump apparatus includes an cuter annul us barrel, an inner working barrel positioned in radially inwardly spaced relation from the outer annular barrel to define a vertical flow annulus therebetween, an elongated inner plunger disposed within and vertically movable by upstrokes and downstrokes relative to the inner working barrel, a lower intake valve assembly disposed within a nd supported by the outer annulus barrel below the inner plunger, and an upper discharge valve assembly disposed within and supported by the outer annular barrel bel ow the inner plunger and above the lower intake valve assembly. The outer annular barrel defines a working chamber between the lower intake valve assembly and upper discharge valve assembly into which crude oil can be drawn through the lower intake valve assembly from a production formation therebelow upon the upstroke of t he inner plunger which causes the lower intake valve assembly to open and the upper discharge valve assembly to close and from which crude oil can be forced through the upper discharge valve assembly into the vertical flow annulus thereabove upon the downstroke of the inner plunger which causes the upper discharge valve assembly to open and the lower intake valve assembly to close.
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