Two-stage compression oil well pump and oil pump process thereof

Abstract

The invention discloses a two-stage compression oil well pump which is mainly composed of an upper pump cylinder (2), a lower pump cylinder (7), an upper plunger (1), an upper oil outlet valve (3), a lower plunger (6), a lower oil outlet valve (8) and an oil inlet valve (10), wherein the upper pump cylinder (2) and the lower pump cylinder (7) are mutually communicated, the upper plunger (1) and the upper oil outlet valve (3) are arranged on the interior of the upper pump cylinder (2), and the lower plunger (6), the lower oil outlet valve (8) and the oil inlet valve (10) are arranged on the interior of the lower pump cylinder (7). Further disclosed is an oil pump process based on the two-stage compression oil well pump. The two-stage compression oil well pump and the oil pump process based on the two-stage compression oil well pump are applicable to an oil well with a high gas-oil ratio. In a down stroke, an upper travelling valve is closed, downward moving of the plungers is benefited, a stress condition of an oil pump rod is better, when the gas-oil ratio is large, an upper working cavity is much smaller than a lower working cavity, and the two-stage compression oil well pump and the oil pump process based on the two-stage compression oil well pump are beneficial for a heavy oil well with high gas content.

Description

technical field [0001] The invention relates to a two-stage compression oil pump and its oil pumping process. 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 bush...

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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