Continuous lifting pump for pumping unit and lifting method thereof

Abstract

The invention discloses a continuous lifting pump for a pumping unit and a lifting method thereof. The continuous lifting pump comprises a pump cylinder connected to an oil pipe and a piston arranged inside the pump cylinder. The pump cylinder comprises an outer cylinder and a work cylinder arranged inside the outer cylinder in a sleeved mode. The upper end of the piston is connected with a piston rod, then the piston is completely arranged in the work cylinder, and the upper end of the piston rod is connected with a pumping rod. The work cylinder is divided into an upper cavity and a lower cavity by the upper portion and the lower portion of the piston. The annulus is formed between the work cylinder and the outer cylinder, flow guide holes communicated to the annulus are formed in the peripheral side of the bottom of the work cylinder, and the upper end of the annulus is communicated to the oil pipe through an eccentric structure. A radial liquid inlet valve and an axial ring group valve are arranged between the pump cylinder and the oil pipe. The upper cavity is communicated to a shaft through the radial liquid inlet valve and to the oil pipe through the axial ring group valve. According to the continuous lifting pump and the lifting method thereof, continuous liquid drainage of the up-down stroke is achieved, and the purposes of increasing the well yield greatly under the same pump diameter and production parameters, reducing the energy consumption and reducing eccentric wear of an oil well are achieved.

Description

technical field [0001] The invention relates to an oil well lifting tool in the field of oil production technology, in particular to a continuous lifting pump of a pumping unit used for oil wells with a large pump diameter and high parameter production in the process of extracting liquid due to high energy consumption and severe eccentric wear. lifting method. Background technique [0002] Gudao Oilfield has been put into polymer injection test since 1992, and put into polymer injection development in 1997. Up to now, the main development units of Gudao Oilfield have all entered into polymer flooding and subsequent water flooding development. At present, a total of 1,262 oil wells have been drilled, with an average pump depth of 783m, an average dynamic fluid surface of 479.4m, and an average pump diameter of 65.3mm. The Φ70mm and Φ83mm oil well pumps are the main oil wells, accounting for 50% of the number of wells opened, of which Φ83mm oil well pumps Accounting for 23.2%...

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Problems solved by technology

In oil wells with high water cut and high corrosion, large pump diameter and high stroke rate are used for production, resultin

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