Oil pumping technique based on mechanical open-and-close valve oil well pump

Abstract

The invention discloses an oil pumping technique based on a mechanical open-and-close valve oil well pump. The technique includes an upstroke and a downstroke. The upstroke includes: an oil pumping rod is elevated to enable a plunger oil outlet valve to be closed, a plunger is driven to move upward, and an oil inlet valve is opened to for oil in-taking; and the pressure of an upper cavity is increased, oil and gas in the upper cavity are exhausted into an oil pipe in advance, and the airlock phenomenon is effectively prevented from occurring. The downstroke includes: the oil pumping rod moves downward to open the plunger oil outlet valve and the upper cavity and a lower cavity to be communicated; when the oil pumping rod moves downward, the plunger is driven to move downward, oil and gas in the lower cavity enter the upper cavity; and during the period of time when the plunger approaches a bottom death center and then leaves the bottom death center, the upper cavity and the lower cavity of the plunger oil outlet valve are communicated by a gas outlet hole to complete gas exhausting and ensure that the plunger oil outlet valve is opened timely in the upstroke. A push block and the gas outlet hole are designed on a valve rod, and when the plunger whether approaches the bottom death center or moves upward for a small distance in a reversing direction, the upper cavity and the lower cavity of the plunger oil outlet valve can be communicated to discharge oil and gas in the upper cavity into the oil pipe in advance, so that the airlock phenomenon is effectively prevented from occurring.

Description

technical field [0001] The invention relates to an oil pumping process based on a mechanical opening and closing valve oil 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. ...

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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