Constant-power energy-saving dragging method of pumping unit

Abstract

Provided is a constant-power energy-saving dragging method of a beam-pumping unit. A device used by the method comprises the beam-pumping unit, a rod oil-pumping pump and a constant-power output type alternating current induction motor special for the pumping unit and provided with a bell-shaped large-rotary-inertia energy storage fly wheel. The special constant-power induction motor can highly adapt to intense pulsating torque load of the beam-pumping unit under the small current condition, keep a power factor to be about 0.9 under the condition that the ultra-high slip ratio S is equal to 20% and perform high-torque constant-power dragging on the beam-pumping unit. The bell-shaped large-rotary-inertia energy storage fly wheel can release torque which is about 1.5 times of average running toque of the constant-power motor in a stroke pulsating torque peak value interval of the beam-pumping unit and jointly drag a pulsating torque peak value, and can absorb inertial kinetic energy released by a heavy type transmission system of the beam-pumping unit in a torque low-valley interval and torque energy of the constant-power motor during speed rising, enable a whole machine system to run under the smooth load and can thoroughly eliminate a phenomenon that the beam-pumping unit severely wastes enteric energy reversely drags the motor.

Description

technical field [0001] The invention relates to a beam pumping unit used for oil production in an oil field and its electric drive technology, in particular to a new type of constant power drive with large torque output characteristics that can be highly adapted to the characteristics of a severe pulsating torque load of a beam pumping unit energy saving law. Background technique [0002] The beam pumping unit has the advantages of simple structure, low price, and low maintenance cost. It has been widely used in oil fields at home and abroad for half a century. However, it also has serious disadvantages. The pumping unit is a device that starts with a heavy load and operates with a light load for a long time, and belongs to the output characteristics of an AC torque motor. If the excess slip power is converted into heat energy and then dissipated to achieve the required torque characteristics, because the resistance of the rotor circuit is very large, it will generate a lot...

AI Technical Summary

Problems solved by technology

[0004] When the AC induction motor is running at zero load or close to zero load, not only the AC induction motor consumes power in vain, but also the power supply equipment such as transformers for oil wells powered by a single machine also consumes power in vain.

Images