Parallel type double-cavity oil well pump

Abstract

The invention discloses a parallel type double-cavity oil well pump, which comprises an upper pump barrel, a lower pump barrel and an outer tube; the upper and lower ends of the outer tube are respectively connected with the upper pump barrel and the lower pump barrel by virtue of couplings; the outer tube is internally provided with a small plunger; the upper end of the small plunger is connected with an upper plunger positioned in the upper pump barrel; the lower end of the small plunger is connected with a lower plunger positioned in the lower pump barrel; an annular hollow space is formed between the outer wall of the small plunger and the inner wall of the outer tube, and is internally provided with a small pump barrel; the small pump barrel divides the annular hollow space into two cavities. The parallel type double-cavity oil well pump disclosed by the invention solves the problems that a conventional rod pump cannot be used for large-discharge lifting in a 51 / 2in casing pipe, and the cost is high and energy consumption is large when an electric pump is used for lifting. The parallel type double-cavity oil well pump has the advantages of less input, low energy consumption, low maintenance cost and the like; most of electric pumps can be replaced with the parallel type double-cavity oil well pump, and the parallel type double-cavity oil well pump has great significance for realizing economical and efficient exploitation of high-water-content high-liquid-production-capacity oil wells.

Description

technical field [0001] The oil well pump involved in the present invention is specifically a parallel double-chamber oil well pump. Background technique [0002] As the oilfield enters the middle and late stages of development, the water content of crude oil in medium and high permeability reservoirs continues to rise. Many oil wells have shallow reservoir burial, high water content (water content above 95%), and large single-well liquid production (daily liquid production 100m 3 / d or above) and other production status, the use of traditional rod pumps cannot meet the large displacement lifting requirements in small borehole diameters (51 / 2in casing), and currently the large displacement electric pump lifting method is mainly used. However, there are problems such as high input cost, high energy consumption, and poor economic benefits in the lifting of large-displacement electric pumps. [0003] In addition, there is no publication or report of this kind of special technol...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a parallel dual-cavity oil well pump to solve the problem that the conventional rod pump cannot achieve large displacement lifting and the lifting cost of the electric pump is high and energy consumption is high

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