Built-in oil well pump plunger for upward-traveling valves

Abstract

The invention provides a built-in oil well pump plunger for upward-traveling valves. An upper oil-outlet joint is in threaded connection with the upper part of an equal-diameter plunger; a traveling valve ball seat is on an upper port of a traveling valve seat; a valve ball cavity and a valve seat hole are arranged under a thread of the upper part of the equal-diameter plunger; the traveling valve seat is fixedly arranged in the valve seat hole; a traveling valve ball is positioned in the valve ball cavity; and the lower part of the upper oil-outlet joint is provided with a block cover. The traveling valve seat and the valve seat hole in the equal-diameter plunger are in interference fit which plays a role in sealing and fixing, or the traveling valve seat and the equal-diameter plunger are connected and fixed through threads, and the lower end face of the traveling valve seat is a sealing surface. As the valve ball cavity is arranged in the equal-diameter plunger, no traveling valve cover needs to be installed; the plunger is simple in structure and high in reliability, and ensures long lifespan of oil well pumps, large flow channel of the valve ball cavity and low flow resistance; and when a small-diameter oil well pump is designed as an equal-diameter oil well pump, the area of the flow channel cannot be reduced while the flow channel of the equal-diameter oil well pump is the same with that of common oil well pump. Therefore, the plunger has the advantages of wide application range, good use performance and significant economic benefit.

Description

technical field [0001] The invention belongs to equipment for oil pumping in oil fields, in particular to a plunger of an oil pump with a built-in upstream floating valve. Background technique [0002] Chinese patent application 200420037954.1 "Swirl flow sand scraping oil pump" is widely used in the field. It sinks the upstream floating valve and the downstream floating valve into the plunger, so that the plunger assembly has an equal diameter shape, and the two ends of the plunger It can scrape sand, prevent sand jamming and sand grinding oil well pump plunger and pump barrel. But its floating valve needs to be installed with a floating valve cover, and it must sink into the plunger to occupy a certain radial space. Therefore, the wall thickness of each part is thin, the cross section is small, the strength is low, the reliability is poor, and the flow path Small, especially for small-diameter oil well pump plungers, these problems are more prominent, and it is difficult ...

AI Technical Summary

Problems solved by technology

But its floating valve needs to be installed with a floating valve cover, and it must sink into the plunger to occupy a certain radial space. Therefore, the wall thickness of each part is thin, the cross section is small, the strength is low, the reliability is poor, and the flow path Small, especially for small-diameter oil well pump plungers, these problems are more prominent, and it is difficult to design equal-diameter oil well pumps for oil well pumps with diameters smaller than φ38

Another problem is that both ends of the floating valve seat and the two ends of the floating valve cover require end face sealing, which requires high processing and assembly technology, and it is difficult to guarantee the quality.

These problems will cause large oil discharge resistance of the oil well pump, difficulty in descending, short service life of the oil well pump, and affect economic benefits

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