DRIVE SYSTEM FOR SURFACE HYDRAULIC ACCUMULATOR

摘要

Pumps are provided, more particularly piston type pumps having increased energy efficiency, systems incorporating such piston type pumps, and methods of operating piston type pumps. The pumps are suitable for pumping of oil from an oil well or for pumping other liquids such as ground water, subterranean liquids, brackish water, sea water, waste water, cooling water, gas, coolants, and the like.

主权项

1. A pumping apparatus, comprising:
a first inlet having an inlet valve; an outlet for product fluid, the outlet having a pressure maintaining valve; an accumulator in fluid communication with the pressure maintaining valve; an internal power fluid column, the internal power fluid column having a second inlet; a transfer piston reciprocatingly mounted about the power fluid column; a product fluid chamber positioned above the transfer piston; a transfer chamber positioned below the transfer piston; a sealable channel in the transfer piston fluidly connecting the product fluid chamber and the transfer chamber, the sealable channel having a transfer piston valve; and at least one passageway fluidly connecting the power fluid column with a power fluid chamber.