| 摘要 |
A downhole hydraulically actuated pump assembly has an engine end and a pump end. A traveling valve assembly is included in both the engine end and the pump end. A discharge guide assembly is interposed between the engine and the pump ends, and thereby enables the connecting rod between the engine and pump ends to be greatly increased in length for a specific size. The traveling valve of the pump end includes a lost motion coupling by which the valve is shifted each stroke of the engine. A formation fluid passageway extends from the lower end of the pump, directly through a rod extension, and into the traveling valve. Accordingly, this novel combination and improvements provide a downhole pump assembly having the maximum diameter engine and pump piston.
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