Oil production pump

Abstract

The invention discloses an oil production pump which comprises an oil-well pump and a hydraulic system. The oil production pump is characterized in that the oil-well pump comprises a pump body, the lower end portion of the pump body is a sealed face which is provided with an oil inlet, an oil inlet valve is arranged on the oil inlet, an oil pumping pipe is vertically arranged in the pump body above the oil inlet valve, an upper piston is arranged outside the upper end portion of the oil pumping pipe in a sleeved mode, a lower piston is fixedly arranged on the lower end portion of the oil pumping pipe in a sleeved mode, the upper piston, the lower piston, the oil pumping pipe and the pump body form a sealed hydraulic oil storage chamber, a middle piston is fixedly arranged in the middle of the oil pumping pipe in a sleeved mode, the middle piston divides the hydraulic oil storage chamber into an upper chamber and a lower chamber with changeable volumes, the upper chamber and the lower chamber are communicated with the hydraulic system through pipelines respectively, and an oil outlet valve is arranged at an upper end outlet of the oil pumping pipe.

Description

technical field [0001] The invention relates to the field of oil extraction machinery, in particular to an oil extraction pump. Background technique [0002] At present, the oil pumping device of oil exploitation is mainly made up of downhole pump and ground beam pumping unit. Affected by geological conditions and production time, many oil fields have very small oil production in the later stage. However, in the face of the increasingly tense energy situation, it is necessary to carry out refined mining in the late stage of oil fields, and the oil fields that were abandoned due to small oil production in the past are now There is also a need for mining; conventional downhole pumps and surface beam pumping units will be incompetent for oil production and development of oil wells with small oil output. The pumping units have extremely low working efficiency and high energy consumption, which greatly increases the development cost. Benefits and pay are seriously out of proport...

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Problems solved by technology

[0003] In the prior art, there are also many improvement schemes aimed at the shortcomings of conventional downhole oil well pumps and surface beam pumping units, such as a downhole hydraulic oil well pump disclosed in Patent No. 201220171144.X, the entire pump body is installed on At the bottom of the oil well, a hydraulic transmission system is installed at the bottom of the oil well pump, and the piston of the hydraulic pump is driven by the connecting rod mechanism, and the sucker rod in the ground beam pumping unit is eliminated, which reduces energy consumption, but its structure is relatively complicated. The shorter the piston rod, the shorter the time for one stroke back and forth, and it is difficult to adjust the stroke. It is also not suitable for developing oil wells with less oil volume, and it will waste a lot of energy.

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