| 摘要 |
A downhole hydraulically actuated pump having an engine piston and a pump piston, with the pistons being arranged with diametrically opposed faces which operate within a common fluid chamber. Multiple pump pistons can be actuated by the engine piston so as to enable simultaneous production to occur from a pluraligy of hydrocarbon producing zones, with the produced fluid flowing to the surface of the earth along separate flow paths.
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