Direct drive motor pumping unit

Abstract

A direct-drive motor oil-pumping unit consists of a permanent magnet motor (4), a sleeve spline coupling (8), a roller assembly (3), a guide wheel assembly (1), a flexible connection mechanism (2), a truss assembly (6), a weight box assembly (7), and an electric hoist (5). One end of the flexible connection mechanism bypassing the roller assembly and the guide wheel assembly is connected to a rope hanger, and the other end is connected to the weight box assembly. The permanent magnet motor is mounted in a suspended manner. The permanent magnet motor and the roller assembly are fixed on the truss assembly through a bolt and are directly connected to each other through the sleeve spline coupling. The guide wheel assembly is fixed to a front side of an upper portion of the truss assembly through a bolt. The weight box assembly is located inside the truss assembly, and the center of gravity thereof coincides with the center of the truss assembly. The electric hoist is fixed to a top portion inside the truss assembly. The oil-pumping unit has the following the beneficial effects: a reduction gearbox and a reversing mechanism are saved, the permanent magnet motor directly drives the roller assembly to perform oil-pumping, the whole structure is compact, and the long stroke is achieved; moreover, the oil-pumping unit is light, occupies a small area, is conveniently maintained, and is efficient and energy-saving.

Description

technical field [0001] The invention is a novel oil extraction mechanical device used in oil extraction in oil fields, and belongs to the field of petroleum machinery technology research. Background technique [0002] Mechanical oil extraction is the main means of oil extraction in oilfields, among which the beam pumping unit is dominant. At present, CNPC is using 121,610 conventional beam pumping units. The working principle of the beam pumping unit is that the motor is decelerated by the V-belt After the gearbox is decelerated, the four-bar linkage mechanism changes the rotary motion of the output shaft of the reduction box into the reciprocating motion of the donkey head of the beam. The motion is transmitted to the plunger in the downhole oil well pump to make it work to pump oil. However, due to the unreasonable structure, high energy consumption, and low power factor of the beam pumping unit, the average efficiency of the system is only 24%, the cost of oil production...

AI Technical Summary

Problems solved by technology

However, due to the unreasonable structure, high energy consumption, and low power factor of the beam pumping unit, the average efficiency of the system is only 24%, the cost of oil production is high, and the energy consumption has reached 70 billion yuan; in order to reduce costs and improve efficiency , various countries have made a series of attempts to improve the beam pumping unit and develop beamless pumping units, but the out-of-phase pumping units developed have not yet solved the problem of “big horse-drawn and small carts”, and the energy-saving effect Not significant; various forms of beamless long-stroke pumping units have been developed at home and abroad, but these pumping units have both advantages and disadvantages, and further research and improvement are needed

[0003] In addition, with the continuous development of oilfields, oil extraction conditions have become increasingly complex, and the oil extraction process has put forward new requirements for rod pumping equipment such as long strokes, low strokes, and deep pumping with large pumps. In terms of applicability, it can no longer meet the requirements of oil recovery technology

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