Oil pumping device for oil field rod pumped well

Abstract

The invention provides an oil pumping device for an oil field rod pumped well, which can effectively prevent a sand sticking accident, reduce the liquid column load of a pumping unit, and improve the pump efficiency. In the oil pumping device, the pumping unit is connected with a sucker rod; the sucker rod penetrates through a Christmas tree fixed on the ground and is connected with an upper travelling valve of an oil well pump through a sucker rod connector; an oil tube is connected at the lower end of the Christmas tree; the oil well pump comprises the upper travelling valve, a plunger and a lower travelling valve which are sequentially connected from top to bottom in a pump cylinder. The oil pumping device is characterized in that the sucker rod is hollow, the pumping unit is connected with the hollow sucker rod sequentially through a polish rod and a tee-joint short connector; the tee-joint short connector is arranged above the Christmas tree, and the side outlet of the tee-joint short connector is connected with a flown line through a hose; the upper end of the pump cylinder is connected with the oil tube through an oil tube connector, and a fixed valve is arranged at the lower end of the pump cylinder.

Description

technical field [0001] The invention relates to the field of oilfield development, in particular to an oil pumping device for an oil field pumping well. Background technique [0002] At present, the oil field pumping that is applied to the oilfield scene adopts a kind of pumping unit well pumping device, and this oil pumping device is made up of pumping unit, oil pipe, sucker rod, oil pump etc. Such as figure 2 As shown, the oil well pump is hung at the lower part of the oil pipe, and the sucker rod drives the plunger of the oil well pump to pump out the crude oil at the bottom of the well through the annular space of the oil pipe to the ground. There are two kinds of sucker rods: hollow sucker rod and solid sucker rod. [0003] The disadvantage of this kind of oil field pumping device is that with the development of the oil field, the water content of the produced fluid will gradually increase, the sandstone oil layer will produce sand, and the formation pressure of some ...

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Problems solved by technology

[0003] The disadvantage of this kind of oil field pumping device is that with the development of the oil field, the water content of the produced fluid will gradually increase, the sandstone oil layer will produce sand, and the formation pressure of some oil wells will drop, so the following problems will occur:

Since the lower part of the fixed valve is connected to the oil layer, and after the oil well has been produced for a long time, the pressure near the oil layer decreases, so when the well is washed, if the pressure of the water column in the wellbore is higher than the pressure of the oil layer, it will cause partial Water will enter the formation, and the lower formation pressure is prone to formation contamination and prolonged drainage cycle

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