Pumping-aiding device of oil pumping rod and sand blocking oil outlet sliding sleeve thereof

Abstract

The invention discloses a pumping-aiding device of an oil pumping rod and a sand blocking oil outlet sliding sleeve thereof. The pumping-aiding device of the oil pumping rod comprises a core rod, wherein the upper end of the core rod is connected with an upper connecting hoop; the lower end of the core rod is connected with a lower connecting hoop; the sand blocking oil outlet sliding sleeve can glidingly sleeve the middle part of the core rod and is a hollow step shaft; the hollow part is a step through hole; a first shaft section and a second shaft section are at least formed on the step shaft from top to bottom; the outer diameters of the first shaft section and the second shaft section are sequentially increased; a transition surface is formed between the first shaft section and the second shaft section; a lateral opening is axially and downwards formed in the place which contains the transition surface and is communicated with the step through hole to form an oil passage; the maximum inner diameter of the sand blocking oil outlet sliding sleeve is smaller than the outer diameter of the lower connecting hoop. According to the pumping-aiding device of the oil pumping rod and the sand blocking oil outlet sliding sleeve provided by the invention, pumping-aiding, sand-blocking and righting functions can be simultaneously realized, and the pumping-aiding device and the sand blocking oil outlet sliding sleeve are simple in structure.

Description

technical field [0001] The invention relates to a petroleum downhole tool, in particular to a pumping aid device for a sucker rod and a sand-retaining oil-discharging sliding sleeve. Background technique [0002] At present, when the rod well pump is used for oil production, since the pump has been working in the well for a long time, the gap between the pump core and the pump barrel is too large due to long-term friction damage, resulting in the decrease of the suction force of the pump and leakage. The situation of suction, thereby greatly reducing the pump efficiency. In order to improve the efficiency of the pump, an auxiliary pumping device is usually arranged on the sucker rod of the oil well pump. [0003] At the same time, due to the well deviation, when the oil pump is working, the sucker rod is not in a vertical state, and it will inevitably rub against the inner wall of the oil pipe during the working process, forming eccentric wear. When the wear reaches a cert...

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Problems solved by technology

When the wear reaches a certain level, the sucker rod will be disconnected, causing workover operations and affecting production

[0004] In addition, when oilfield development enters the middle and late stages, many oil wells have low fluid production

Especially in sand-bearing wells, when the fluid production rate of the oil well is low and the upward velocity of the produced fluid in the oil extraction string is lower than the downward velocity of the sand particles, the sand particles will sink in the oil extraction string and fall on the oil well pump, and some of them will It will enter the gap between the plunger and the pump barrel, which will cause the pump to be stuck. In some wells with severe sand production, the sand will even bury the pump plunger, which will cause the sucker rod to break off and the pumping unit to be damaged.

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