Series connected type double-acting injection-production pump for high-water-cut oil-producing well

Abstract

The invention relates to a series connected type double-acting injection-production pump for a high-water-cut oil-producing well. The series connected type double-acting injection-production pump mainly consists of a connecting-tripping device, an upper part tubing coupling, a double-acting oil pumping pump assembly, a middle coupling, a middle pump cylinder, a core rod, a double-acting water injection pump assembly, a swirler assembly and a flow channel, wherein the upper end of the double-acting oil pumping pump assembly is connected with the upper part tubing coupling; an upper plunger is arranged in the double-acting oil pumping pump assembly; the connecting-tripping device is mounted at the upper end of a connector of the connecting-tripping device of the upper plunger; the lower endof the double-acting oil pumping pump assembly is sequentially connected with the middle coupling and the middle pump cylinder; the lower end of the middle pump cylinder is connected with the double-acting water injection pump assembly; a lower plunger is arranged in the double-acting water injection pump assembly, and is connected with the upper plunger through the core rod; the swirler assemblyis mounted at the lower end of the double-acting water injection pump assembly; and when the oil pumping rod is in reciprocating motion once, the series connected type double-acting injection-production pump completes oil recovery twice and waterflooding twice, so that the flow fluctuation of liquid entering a downhole swirler can be reduced, and the separation efficiency of the downhole swirler is improved.

Description

technical field [0001] The invention relates to an oil well pump, in particular to a serial double-action injection-production pump used for high water-cut oil wells. Background technique [0002] Many oilfields in my country have entered the development stage of high water cut period. It is necessary to improve the existing oil well lifting system and organically combine it with the downhole hydrocyclone to form the same well injection and production system. When the existing single-acting injection-production pump is used, the time for the high-water-cut formation fluid to enter the downhole cyclone is only half a cycle, resulting in low separation efficiency of the cyclone. In order to increase and stabilize crude oil production, electric pumps are widely used in various oil fields. However, electric pumps have the problems of large one-time investment, high accident rate, high maintenance review and operation costs, and are not suitable for the purpose of saving energy a...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of insufficient oil-water separation efficiency of the existing same-well injection-production machine pumping pump, and provide a series double-acting injection-production pump for high water-cut oil wells, which is used to reduce the flow rate of liquid entering the downhole cyclone fluctuations, improving the separation efficiency of downhole cyclones

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