Double-action oil well pump used for rodless oil extraction

Abstract

The invention discloses a double-action oil well pump used for rodless oil extraction. The double-action oil well pump comprises an upper coupling, a long pump cylinder, a long plunger, a lower pump coupling, a short pump cylinder and a lower coupling. The double-action oil well pump is characterized in that an upper pump oil outlet valve is arranged at the upper end of the long pump cylinder; a liquid inlet is formed in a side wall of the long pump cylinder; a movable joint seat is arranged at the lower end of a short plunger; an end cap is arranged at the upper end of the short plunger; the lower end of a movable joint penetrates through the movable joint seat at the lower end of the short plunger and is connected and fixed with the upper end of the long plunger; a flow converter is arranged at the lower end of the upper coupling; a middle flow channel and a side flow channel are formed in the flow converter; a lower end opening of the side flow channel is fixedly connected with an outlet of the upper pump oil outlet valve; an upper end opening of the side flow channel is communicated with an inner cavity of the upper coupling; a lower end opening of the middle flow channel is communicated with an oil outlet of the lower pump coupling through a high-pressure oil pipe; an upper end opening of the middle flow channel is connected and fixed with the lower pump oil outlet valve; and the oil outlet of the lower pump coupling is communicated with the bottom of a lower pump cavity. According to the double-action oil well pump, twice liquid feeding and twice liquid discharging are finished by one stroke, so that the liquid production capacity of a single well is increased.

Description

technical field [0001] The invention relates to an improvement of an oil well pump, in particular to a double-acting oil well pump used for rodless oil production. Background technique [0002] In crude oil extraction, single-acting pumps are generally used in oil fields. However, some oil wells with relatively large displacement, or oil wells with rising water content in the middle and late stages of oil field exploitation, need to use oil well pumps with larger pump diameters to increase the liquid production of a single well, which will increase energy consumption and Oil production costs. The currently used double-acting oil well pump has a large number of valves in the structure, a complex structure, a high failure rate, and a relatively short service life, and is mostly used in rod oil production. Contents of the invention [0003] The purpose of the present invention is to provide a simple structure, reliable operation, powered by linear motors or hydraulic cylind...

AI Technical Summary

Problems solved by technology

However, some oil wells with relatively large displacement, or oil wells with rising water content in the middle and late stages of oil field exploitation, need to use oil well pumps with larger pump diameters to increase the liquid production of a single well, which will increase energy consumption and Oil production cost

The double-acting oil well pumps currently used have a large number of valves in the structure, complex structure, high failure rate, relatively short service life, and are mostly used in rod oil production.

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