Double-fixation scale-blockage-preventing long-plunger sand-preventing oil well pump

Abstract

The invention discloses a double-fixation scale-blockage-preventing long-plunger sand-preventing oil well pump. The double-fixation scale-blockage-preventing long-plunger sand-preventing oil well pump comprises an outer pipe, and pump cylinders arranged in the outer pipe at intervals, wherein the upper end of the outer pipe is connected with an extension nipple through an oil pipe righting coupling; the inner surface of the oil pipe righting coupling is provided with multiple inner righting blocks, and is in environment-friendly contact with the outer surfaces of the pump cylinders; the upper ends of the pump cylinders are connected with righting bodies through threads, and the lower end surfaces of the pump cylinders are pressed against the upper end surfaces of the inner righting blocks of the oil pipe righting coupling; the lower ends of the pump cylinders are connected with pump cylinder lengthening pipes through pump cylinder couplings; righting blocks of the righting bodies are respectively in support contact with the inner wall of the extension nipple in all directions; external threads are arranged at the lower ends of pump cylinder lengthened pipes, and the lower ends of the pump cylinder lengthened pipes are in threaded fit and connection with lower joints; external threads are arranged on the outer surfaces of the upper ends of the lower joints and the lower end of the outer pipe; and the lower joints and the outer pipe are in fit and connection through lower couplings. The double-fixation scale-blockage-preventing long-plunger sand-preventing oil well pump is simple in structure, convenient for use, effectively reduced in shaking in an oil well, improved in pumping efficiency, and prolonged in service life.

Description

technical field [0001] The invention relates to the field of petroleum machinery, in particular to a long plunger sand control oil well pump for oil fields. Background technique [0002] The development of the oil field has entered the medium-high water cut period, the salinity and corrosion ability of the oil well have been greatly enhanced, and the sand production and scaling are becoming more and more serious. It is easy to cause scaling and jam the pump, which seriously affects the production of the oil well. The anti-scaling card oil well pump adopts a special structure of long plunger and short pump barrel, and the pump barrel has an outer tube. This structure ensures that if there is scale in the well, it will be deposited in the annulus between the pump barrel and the outer pipe; since the pump barrel is easy to swing inside and the pump efficiency is low during oil production operations, steel centralizers are used for anti-scaling pumps Claws are easy to cause per...

AI Technical Summary

Problems solved by technology

[0003] In view of the above defects, the present invention provides a simple structure, reasonable design, safe and stable double fixed anti-scaling card long plunge

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