Deep well single-action hydraulic piston pump

Abstract

The invention relates to a deep well single-action hydraulic piston pump. The deep well single-action hydraulic piston pump implements automatic reversing underground through power fluid provided by asurface pump. The deep well single-action hydraulic piston pump is characterized in that the upper end of a piston rod is grooved. During an up stroke, a sliding valve is located in an upper extremeposition under the action of upward acting force, and the piston rod moves upwards under the action of the upward acting force. When moving upwards, the piston rod can gradually cut off the power fluid to act on a flow channel at the lower end of the sliding valve, and the sliding valve starts to bear the downward acting force to move downwards to arrive at a lower extreme position. The force direction and the moving direction of the piston rod can be changed by changing the upper and lower extreme positions of the sliding valve, and then the piston pump can do up-down reciprocating motion tosuck and discharge crude oil. When sucking fluid during the up stroke, the hydraulic piston pump serves as a double-fluid motor driven single pump, can overcome huge bottom hole pressure and can be truly applied to deep well and ultra-deep well oil production. Through the ingenious design, the sealing surface of the sliding valve is free of fluid erosion, and the sliding valve is high in operatingreliability.

Description

technical field [0001] The invention relates to a hydraulic piston pump for petroleum exploitation, and belongs to the technical field of petroleum rodless oil exploitation. Background technique [0002] In recent years, with the deepening of oil extraction, the depth of oil wells has been increasing, and there are more and more deep and ultra-deep wells. At the same time, the temperature at the bottom of the well is high, and the pressure at the bottom of the well is increasing. My own limitations and problems are becoming more and more prominent. Due to the advantages of high pump efficiency, simple manufacture, and strong reliability, hydraulic piston pumps can operate efficiently in deep and ultra-deep wells, high-wax and high-viscosity oil wells, and have always occupied an important position in existing oil production equipment. [0003] In recent years, there have been many patent applications for hydraulic piston pumps at home and abroad. Although many hydraulic pis...

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Problems solved by technology

[0003] In recent years, there have been many patent applications for hydraulic piston pumps at home and abroad. Although many hydraulic piston pump patents that can be retrieved have their own advantages, they also have many obvious disadvantages: 1. The sealing surface of the slide valve has fluid erosion , there will b

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