Mechanical switch valve oil-well pump

Abstract

The invention discloses a mechanical switch valve oil-well pump which is mainly composed of a pump cylinder (18), a valve rod (9) arranged in the pump cylinder (18), and a plunger arranged at the lower end of the valve rod (9). The plunger partitions the interior of the pump cylinder (18) into an upper cavity chamber (13) and a lower cavity chamber (17). A pushing block and an air-bleed hole are arranged on the valve rod, a plunger delivery valve upper cavity and a plunger delivery valve lower cavity can be communicated when the plunger is close to a bottom dead center and reverses to ascend for a small section of distance, oil gas in the upper cavity chamber is exhausted into an oil tube in advance, and therefore 'airlock' is effectively prevented from happening.

Description

technical field [0001] The invention relates to a mechanical opening and closing valve oil well 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 bushing type...

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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