Feedback type oil-well pump

Abstract

The invention relates to a feedback type oil-well pump. The lower part of an upper plunger piston is connected with the upper part of an oil outlet valve, and the oil outlet valve is connected with the upper plunger piston; the upper plunger piston is positioned in an upper pump barrel, and a lower plunger piston is positioned in a lower pump barrel; the lower part of the upper pump barrel is connected with the upper part of a connecting pipe, the lower part of the connecting pipe is connected with the upper part of a flow passage joint, and the lower part of the flow passage joint is connected with a large thread of a shunt joint; the lower part of the lower pump barrel is connected with the upper part of the shunt joint, and the lower part of the shunt joint is connected with an oil inlet valve; the shunt joint is provided with a lateral flow passage which is communicated with the oil inlet valve; and the shunt joint is provided with a vertical flow passage which is communicated with the lower pump barrel. The connecting pipe bears axial force, and the lower pump barrel does not bear the axial force, therefore, the feedback type oil-well pump can be used for producing with a long-tail pipe and a packer. The oil inlet valve is arranged on the lower part and not limited by the pump diameter. In the prior sleeve well, the diameter of a valve ball can be increased to a large enough diameter so as to ensure that the valve ball has flexible working, instant close and high reliability in a thick oil well.

Description

Technical field: [0001] The invention is a downhole tool for extracting heavy oil used in oil fields, and is a feedback type oil well pump. Background technique: [0002] The existing feedback oil well pump is composed of two oil well pumps with different pump diameters connected in series. The downward thrust is generated by the difference in area and pressure. Therefore, one pump must be a small pump. Because the outer diameter of the small pump is small, Low rigidity and strength, low compressive and tensile capacity, can not be produced with long liner and packer, and many wells that require layered oil production cannot be used. The valve ball of the general feedback oil well pump is installed on the plunger, limited by the diameter of the pump, the diameter of the valve ball is small, and it is easy to work ineffective in heavy oil, causing the oil well to not produce oil. Chinese patent application 200620085231.8 bottom heavy well pump, the valve body is an eccentric...

AI Technical Summary

Problems solved by technology

[0002] The existing feedback oil well pump is composed of two oil well pumps with different pump diameters connected in series. The downward thrust is generated by the difference in area and pressure. Therefore, one pump must be a small pump. Because the outer diameter of the small pump is small, Low rigidity and strength, low compressive and tensile capabilities, cannot be produced with long tailpipes and packers, and cannot be used in many wells that require layered oil production

The valve ball of the general feedback oil well pump is installed on the plunger. Due to the limitation of the pump diameter, the diameter of the valve ball is small. It is easy to work ineffective in heavy oil, causing the oil well to not produce oil.

Chinese patent application 200620085231.8 bottom heavy well pump, the valve body is an eccentric structure, the diameter of the oil inlet valve ball is not limited by the pump diameter, and the diameter of the oil inlet valve ball is increased, so that it can work flexibly in heavy oil wells, close immediately, and improve pumping The reliability of the oil pump, but it is also limited by the diameter of the casing, and the space for increasing the diameter of the oil inlet valve ball is limited

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