Combined pump barrel small-diameter oil well pump

Abstract

The invention relates to a combined pump barrel small-diameter oil well pump. The combined pump barrel small-diameter oil well pump comprises a pump barrel assembly, a plunger assembly and an oil inlet valve assembly, an upper cover, a closed oil outlet valve cover, a traveling valve ball, a traveling valve seat and a plunger centering device are arranged in an oil pipe nipple, the upper cover is in threaded connection with the closed oil outlet valve cover, the traveling valve ball and the traveling valve seat are arranged in the closed oil outlet valve cover, the closed oil outlet valve cover is a quincuncial oil outlet hole structure with guide ribs, the upper end portion of the oil pipe nipple is connected with an oil pipe coupling, the lower end of the oil pipe nipple is connected with an upper pump barrel coupling, a hollow plunger is connected to the lower end of a traveling valve assembly, and a rectangular balance groove is formed in the lower portion of the hollow plunger; the upper end of the upper pump barrel is connected with the upper pump barrel coupling, the lower end is in threaded connection with a lower pump barrel, and the inner diameter of the lower pump barrel is 1mm larger than the diameter of the upper pump barrel; the lower pump barrel is connected with a lower pump barrel coupling. The combined pump barrel small-diameter oil well pump has the advantages that the interstitial leakage of the oil well pump can be reduced and the degree of wear between the pump barrel and the plunger is reduced.

Description

technical field [0001] The invention relates to the technical field of mechanical oil extraction equipment in the petroleum industry, in particular to a combined pump cylinder small-diameter oil well pump. Background technique [0002] In the process of oilfield exploitation, due to the decrease of the oil supply capacity of the formation and the decrease of the fluid production of the oil well, the unbalanced problem of supply and production generally exists in low-yield oil wells. Due to the limitation of the structure and processing technology of the conventional oil well pump, the pump diameter cannot be made larger. Small, the displacement does not match the fluid supply of the oil well, resulting in low production efficiency for low-yield oil wells. At the same time, when the oil well pump is in normal operation, due to the gap between the plunger and the pump barrel, there is a large pressure difference between the two ends of the gap, resulting in gap leakage and red...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a small-diameter oil well pump with a combined pump barrel, which is used to solve the problems of the gap leakage of the plunger pump barrel of the small-diameter oil well pump in the prior art and the problem of reduced plunger strength and increased leakage caused by eccentric wear, and Due to factors such as frequent wear of the valve ball in the oil discharge chamber, the fatigue of the oil discharge valve cover and the lagging closure of the valve ball lead to increased leakage.

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