| 摘要 |
A hydraulically actuated down-hole pump formed as a vertically elongated tubular structure having an engine outer tube that receives a reduced external diameter engine cylinder providing an annular power fluid passageway there between with an engine piston in the engine cylinder, a production outer tube supported to a lower end of the engine outer tube, the production outer tube receiving a reduced external diameter production cylinder providing an annular production fluid passageway there between, a ported valve rod interconnecting the engine piston and production piston, an engine valve controlling the delivery of power fluid to the power cylinder and production valve controlling the passage of production fluid to the production cylinder, the annular passageways reducing the need for external pump seals.
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