String-type planetary reducer for electric submersible thickened oil screw pump

Abstract

The invention discloses a string-type planetary reducer for an electric submersible thickened oil screw pump. The string-type planetary reducer for the electric submersible thickened oil screw pump comprises a box body. A sun gear axle and more than two sets of planetary gear transmission assemblies respectively arranged along the axial direction of the sun gear axle are arranged in the box body; each planetary gear transmission assembly comprises a sun gear, an inner gear ring, a planetary gear and a planetary gear carrier, wherein the sun gear is fixedly arranged on the sun gear axle; the inner gear ring is fixedly arranged on the box body; the planetary gear is arranged between the sun gear and the inner gear ring; and the planetary gear carrier is used for supporting the planetary gear. The planetary gear carriers in adjacent two sets of planetary gear transmission assemblies are connected through a planetary gear carrier connecting piece; the top end of the planetary gear carrier located at the uppermost end is provided with a reducer output shaft. According to the string-type planetary reducer for the electric submersible thickened oil screw pump, torsional power can be jointly transmitted by a plurality of planetary gear trains, so that the torsional power is evenly loaded, and the service life is prolonged.

Description

technical field [0001] The invention relates to a reducer for the petroleum industry, in particular to a serial planetary reducer for an electric submersible heavy oil screw pump. Background technique [0002] As many domestic oil and gas fields enter the middle and late stages of exploitation, the proportion of mechanical oil recovery is increasing. In order to further increase oil production and production efficiency, save ground space, and reduce costs, domestic oil companies mostly use submersible screw pump equipment to replace traditional beam pumping units to extract oil, especially for extended-reach wells and horizontal wells in offshore oil and gas fields. In the case where the traditional pumping unit cannot be placed, the electric submersible screw pump oil production system is widely used. The advantage of the screw pump is that it can handle crude oil with high viscosity and high sand content. As the viscosity increases, the screw pump must work effectively at...

AI Technical Summary

Problems solved by technology

However, due to the limitation of diameter and space in the underground, it is not possible to use the huge reduction box driven by the ground

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