A drag-reducing and sand-preventing rod well pump

Abstract

The invention relates to an anti-drag sand-proof rod oil well pump. The outer periphery of the upper portion of a plunger is provided with a groove matched with a rubber ring, sealing of a gap between the plunger and a pump barrel is realized, and the problem that sand is prone to getting into the gap between the plunger and the pump barrel to result in sand jamming when the pump stops operating in well shut-in period and the plunger is at upper or lower dead points is solved. Owing to the rubber ring structure, rigid contact between the plunger and the pump barrel is modified into flexible contact, and downgoing resistance of the plunger is reduced by increase of contact area and the gap between the plunger and the pump barrel. By the aid of an inverted frustum conical structure at a plunger discharge valve and an internal streamline flow passage, downgoing resistance of the plunger can be reduced to enable underground fluid to flow out of a pump cavity more easily. Owing to the streamline flow passage in the lower half portion of a suction valve, resistance of well fluid flowing through the suction valve can be reduced.

Description

technical field [0001] The invention relates to the technical field of underground oil pumping, in particular to a drag-reducing and sand-preventing rod well pump. Background technique [0002] For heavy oil wells or polymer flooding wells with high well fluid viscosity, the viscosity of the well fluid has a great influence on the resistance of the conventional oil pump plunger when it goes down. In order to reduce friction, the method of increasing the gap of the plunger pump barrel is usually used to reduce the downward resistance. However, for sand producing wells, the sand particles carried in the well fluid are more likely to settle into the plunger gap of the pump barrel when the plunger stops moving. Currently widely used measures include the plunger on the car out of the sand control groove, long plunger sand control pump and so on. These measures have a certain effect in reducing friction, preventing sand sticking, and slowing down abrasion, but they cannot be fund...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in the conventional rod pumping process, sand is easily stuck between the plunger and the pump barrel of the oil pump, and the plunger has a large downward resistance. The present invention provides a drag-reducing and sand-proof rod pump, By changing the sealing method between the sealing plunger and the pump barrel, adopting a new type of inflow channel, with a new surface treatment process and a new type of sealing material to achieve the effect of drag reduction and sand prevention

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