Oil pumping technique based on annular valve gas-prevention pump

Abstract

The invention discloses an oil pumping technique based on an annular valve gas-prevention pump. The technique includes the following steps of an upstroke and a downstroke. The upstroke includes: an annular valve is opened timely under the driving of friction of a valve rod, a traveling valve stops oil outlet under the action of the liquid column pressure of an oil pipe, meanwhile, the volume of a lower pump cavity is increased, the pressure of the lower pump cavity is decreased, and a fixed valve is opened. The downstroke includes: the annular valve is timely closed under the action of friction of a pull rod and bears the liquid column pressure of the oil pipe, meanwhile the volume of a pump cavity above a plunder is increased, the pressure of the pump cavity above the plunder is reduced, the volume of a pump cavity below the plunger is reduced, the pressure of the pump cavity below the plunger is increased, differential pressure is generated between the upper end and the lower end of the plunger, and thus the traveling valve is opened rapidly. The oil pumping technique based on the annular valve gas-prevention pump is suitable for high-oil-gas-ratio wells with less sand, the annular valve gas-prevention pump with the oil pumping technique is high in efficiency, long in service life and convenient to use and maintain.

Description

technical field [0001] The invention relates to an oil pumping process based on an annular valve anti-air pump. Background technique [0002] Before the 20th century, the development of oil well pump technology at home and abroad was slow, and it was not until the middle of the 20th century that the whole barrel oil well pump was studied and produced simultaneously with the bushing type oil well pump. There are two technically controversial issues about oil well pumps: one is whether the whole barrel type oil well pump is better or the bushing type oil well pump is better; the other is whether it is better to have sand control grooves on the plunger or not to have sand control grooves. Until the 1980s, due to the significant improvement of the pump efficiency of the whole barrel pump, it is generally about 10% higher than that of the bushing pump, which prolongs the service life of the plunger pump barrel pair, and can save about 40% of high-quality steel. Instead of the bu...

AI Technical Summary

Problems solved by technology

There are two technically controversial issues about oil well pumps: one is whether the whole cylinder type oil well pump is better or the bushing type oil well pump is better; the other is whether it is better to have sand control grooves on the plunger or no sand control grooves

These gases occupy part of the volume of the pump chamber, which will reduce the fullness of the pump chamber, resulting in the lagging of the valve ball of the oil well pump, and even the phenomenon of "air lock"

"Hydraulic shock" also occurs during "air lock", causing vibration of the rod pumping system and accelerating its damage

As a result, pumping wells are frequently operated, shortening the pump inspection cycle, and increasing development costs

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