| 摘要 |
The present invention provides a hydraulically driven multiphase pump system (100) and methods for pumping a fluidstream from the surface of a well. The hydraulically driven multiphase pump system (100) consists of two vertically disposed plungers (310, 315). The plungers are hydraulically controlled and actuated to work in alternate directions during a cycle using a closed loop hydraulic system (200). Each cycle is automatically re-indexed to assure volumetric balance in the circuits. An indexing circuit (300) ensures that each plunger reaches its full extended position prior to the other plunger reaching its preset retracted position. A bias member (325, 327) and an acceleration valve (350) are used to prime the indexing circuit for use in low or variable inlet pressure situations. A power saving circuit (500) is used to transfer energy from the extending plunger to the retracting plunger.
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