Hydraulic Oilfield Lift Pump

a technology of hydraulic oilfield and lift pump, which is applied in the direction of piston pump, fluid removal, borehole/well accessories, etc., can solve the problem of low effective electric rate, and achieve the effect of reducing system stress and reducing large load fluctuations
US20100300679A1Inactive Publication Date: 2010-12-02NAT OILWELL VARCO LP
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Patent Information

Authority / Receiving Office
US ¡ United States
Current Assignee / Owner
NAT OILWELL VARCO LP
Publication Date
2010-12-02
Estimated Expiration
Not applicable ¡ inactive patent

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Abstract

A vertically orientated hydraulically driven oilfield lift pump unit having a simplified hydraulic system. The system uses a pair of single acting hydraulic cylinders in tandem with a pair of double acting hydraulic cylinders interacting with hydraulic accumulators to provide an energy efficient, robust hydraulic system design with a minimum number of components.
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Description

[0001] This application claims priority from U.S. provisional patent application Ser. No. 61 / 183,264, filed on Jun. 2, 2009, which is incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] This invention relates to lift pumps suitable for producing hydrocarbons and other liquids from the earth. In particular, this invention is drawn to a very long stroke hydraulically operated lift pump using a combination of single and double acting hydraulic cylinders that are actuated with an energy efficient hydraulic fluid accumulator system.

[0004] 2. Description of the Related Art

[0005] Hydraulically operated Oilfield lift pumping units are well known and have been used in the industry for many years. Typically, these units mimic the non-hydraulic mechanical ‘walking beam’ design similar to the pumping unit 10 illustrated in FIG. 1. These conventional units are more commonly driven directly by electric motors through gear boxes, but many are also hydrauli...

Claims

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