Oil well pump capable of adjusting effective stroke

Abstract

The invention relates to an oil well pump capable of adjusting effective stroke, and mainly solves the problem of incapability of respectively changing the working displacements of two pumps under the condition of serial connection in the injection and production well production process in a traditional oil well pump. The oil well pump is characterized in that an upper pump cylinder (5) is connected with a lower pump cylinder (8) through a coupling (6); an upper plunger (7) is positioned in the upper pump cylinder (5); the lower end of the upper plunger (7) is connected with an oil outlet valve (10) through a plunger joint (9); the lower end of the oil outlet valve (10) is connected with an oil inlet valve (16) through a plunger assembly (11); the lower end of the oil inlet valve (16) is connected with a lower plunger (18); and an oil leaking tank (22) is formed in the side wall of the lower end of the lower pump cylinder (8). The oil well pump capable of adjusting effective stroke can achieve the purposes of changing the effective stroke and the working displacements through changing relative positions of the plungers and the pump cylinders under the condition of not changing the stroke and the stroke times.

Description

Technical field [0001] The invention relates to the field of oil fields, in particular to an oil pump with an adjustable effective stroke. Background technique [0002] As the oilfield enters the high water cut development period, the liquid-to-oil ratio rises rapidly, and the continuous increase in water cut causes excessive lifting costs. When the water cut approaches or reaches the economic limit, it will be necessary to stop production and shut down the well, which will affect the oilfield production. At the same time, the oil-water treatment volume is year by year. Increasingly, a large amount of produced water undergoes long-distance circulation, resulting in an increase in energy consumption of the gathering and transportation system, and an increasing amount of ground engineering construction. [0003] Downhole oil-water separation and well injection-production technology is to use downhole oil-water separation equipment to separate the produced fluid from the production la...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortage that the existing oil well pumps cannot change the respective working displacements when two pumps are connected in series during the production process of the same injection well, the present invention provides an oil well pump with adjustable effective stroke. Adjusting the effective stroke of the oil well pump can achieve the purpose of changing the effective stroke and working displacement of the oil well pump by changing the relative position between the plunger and the pump barrel without changing the stroke and stroke times of the oil well pump

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