Direct drive motor pumping unit

Abstract

The invention provides an direct drive motor pumping unit comprising a permanent magnet motor, a sleeve spline coupler, a roller assembly, a guide wheel assembly, a flexible connection mechanism, a truss assembly, a weight box assembly and an electric hoist, wherein one end of the flexible connection mechanism passing around the roller assembly and the guide wheel assembly is connected to a polished rod eye, and the other end of the flexible connection mechanism is connected with the weight box assembly; the pumping unit provided by the invention has the main characteristics as follows: the permanent magnet motor is installed in a hanging way, the permanent magnet motor and the roller assembly are fixed on the truss assembly through bolts and directly connected through the sleeve spline coupler; the guide wheel assembly is fixed on the front side of upper part of the truss assembly by bolts, the weight box assembly is located in the truss assembly, and the center of gravity of the weight box assembly is overlapped with the center of gravity of the truss assembly, and the electric hoist is fixed at the top end of the interior of the truss assembly by bolts. The direct drive motor pumping unit has the beneficial effects that a reduction box and a reversing gear are saved, the operation of oil extracting is directly implemented by driving the roller assembly by the permanent magnet motor, the whole structure is compact, the long stroke is carried out, the weight is light, the floor space is small, the maintenance is convenient, the efficiency is high, and the energy is saved.

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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