Sucker-rod lifting whole-process liquid discharging oil well pump

Abstract

The invention discloses a sucker-rod lifting whole-process liquid discharging oil well pump. The sucker-rod lifting whole-process liquid discharging oil well pump comprises a small pump cylinder, a large pump cylinder, an upper outer pipe, a two-way joint, an upper plunger and a descending assisting plunger, wherein the small pump cylinder, the large pump cylinder, the upper outer pipe and the two-way joint are sequentially connected from top to bottom; the upper plunger and the descending assisting plunger are sequentially connected from top to bottom; the upper plunger comprises an upper small-diameter section and a lower large-diameter section, wherein the upper small-diameter section runs inside the small pump cylinder; the lower large-diameter section runs inside the large pump cylinder; the upper outer pipe is provided with an axial center through hole and an eccentric through chamber; the descending assisting plunger runs inside the center through hole of the upper outer pipe; the two-way joint is provided with an axial flow channel and a radial flow channel which do not communicate with each other; the lower end of the center through hole of the upper outer pipe is connected with the radial flow channel; and the lower end of the eccentric through chamber of the upper outer pipe is connected with the axial flow channel. The sucker-rod lifting whole-process liquid discharging oil well pump disclosed by the invention can realize liquid discharging in a whole lifting process of a sucker-rod pump, saves energy and improves the oil output efficiency.

Description

technical field [0001] The invention relates to an oil well pump used for lifting in an oil field, in particular to a full-range liquid outlet oil well pump for lifting with a rod. Background technique [0002] At present, cost reduction and efficiency enhancement are the mainstream trend in oilfields. Conventional rod pumps usually produce liquid in a single pass, which will inevitably cause energy loss. The screw pump can realize the whole process of liquid discharge, but the supporting cost is greatly increased, and it can only be used in some special oil wells, and cannot be widely promoted in oil fields. Another example is the patent No. 201610264879.X for the double-acting oil pump patent for rodless oil production, which announced a full-range liquid pump, but it is limited to rodless pump oil production wells powered by hydraulic cylinders and linear motors. It is more limited in application. Therefore, there is an urgent need to invent an oil well pump that is sui...

AI Technical Summary

Problems solved by technology

[0002] At present, cost reduction and efficiency enhancement are the mainstream trend in oilfields. Conventional rod pumps usually discharge liquid in a single pass, which will inevitably cause energy loss.

The screw pump can realize the whole process of liquid discharge, but the supporting cost is greatly increased, and it can only be used in some special oil wells, and cannot be widely used in oil fields.

Another example is the patent No. 201610264879.X for the double-acting oil pump patent for rodless oil production, which announced a full-range liquid pump, but it is limited to rodless pump oil production wells powered by hydraulic cylinders and linear motors. It is more limited in application

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