Downhole oil well pump

Abstract

The invention discloses an underground oil well pump which comprises a sliding sleeve, a pawl spring, a lifting mechanism, an outer tube and a two-way joint, wherein the sliding sleeve is provided with a through hole; the pawl spring is arranged inside the sliding sleeve; sliding can be generated between the pawl spring and the sliding sleeve so as to enable the through hole to have two open and closed states; the lifting mechanism is arranged at the lower end of the pawl spring and is used for lifting liquid; the outer tube sleeves the sliding sleeve and the lifting mechanism; an annular space is formed by the outer tube and the sliding sleeve as well as the lifting mechanism; the two-way joint is arranged at the lower ends of the outer tube and the lifting mechanism; the two-way joint is provided with a passage for communicating the annular space with an opening below the two-way joint and communicating the lifting mechanism with the lateral part of the two-way joint; when the through hole is in the open state, a first flow passage is formed by the opening, the annular space and the through hole; when the through hole is in a closed state, a second flow passage is formed by the passage and the lifting mechanism. The underground oil well pump disclosed by the invention can achieve integration of steam injection and oil production, and solves the problem of damage of high-temperature steam to parts inside a pump barrel of the underground oil well pump.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to an downhole oil well pump. Background technique [0002] How to reduce the cost and maximize the production of heavy oil and super heavy oil is a common issue faced by the world's petroleum industry. Due to the high viscosity of heavy oil, it brings great difficulties to mining, gathering and processing. Scholars at home and abroad have done a lot of research work to reduce the viscosity of heavy oil. At present, the idea of ​​increasing the production of heavy oil reservoirs is mainly to reduce the viscosity of heavy oil, increase the permeability of the reservoir, and increase the production pressure difference. The main mature technologies include steam injection thermal recovery, burning oil layers, hot water + chemical huff and puff, and sand-carrying cold recovery etc. [0003] At present, steam injection thermal extraction is the most important extraction m...

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Problems solved by technology

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide an downhole oil well pump, which can realize steam injection and oil recovery in one, and solve the problem of high temperature steam causing damage to the internal parts of the downhole oil well pump barrel. damage problem

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