Equant oil pump plunger assembly

Abstract

The invention relates to an equant oil pump plunger assembly, comprising an upper oil outlet joint, an equant plunger, a traveling valve ball, a traveling valve seat and a valve seat joint. The upper oil outlet joint is provided with an oil outlet groove; the upper oil outlet joint, the equant plunger and the valve seat joint are sequentially connected together; the traveling valve ball seat is arranged at the upper port of the traveling seat; a valve seat hole and a valve ball chamber are arranged above a screw under the equant plunger; the traveling valve seat is installed in the valve seat hole; the traveling valve ball is arranged in the valve ball chamber; and a shielding cover is installed above the valve ball chamber and fixed in the equant plunger. The valve ball chamber is arranged in the equant plunger, without installing a traveling valve bonnet. The equant plunger has simple structure, high reliability; the oil pump has long service life; and the valve ball chamber has a large flow channel and small flow resistance. When an oil pump with a small diameter is designed as the equant plunger, the flow channel area can not be reduced and is same as that of the common oil pump. Therefore, the equant oil pump plunger assembly has wide application range, good use performance and remarkable economic benefit.

Description

technical field [0001] The invention belongs to equipment for pumping oil in an oil field, in particular to a plunger assembly of an equal-diameter oil pump. 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 to design equa...

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 a diameter of less than 38mm

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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