Flexible dragging method of oil pumping unit

Abstract

The invention discloses a flexible dragging method of an oil pumping unit and relates to the oil field oil extraction technology. An alternating current motor rotor shaft is a hollow rotor shaft, a stator winding in a shell is composed of two independent star wiring windings, and when the oil pumping unit is started, the two independent star wiring windings are connected into a power grid in parallel; after starting is completed, the two independent star wiring windings are automatically switched to be connected into a power grid in series. When two sets of independent star wiring windings of the alternating-current motor are connected into a power grid in parallel for operation, the beam-pumping unit can be quickly started within 10-20 seconds, so the average power factor of a dragging system of the beam-pumping unit is improved from about 0.3 to 0.85 or higher, and average operation efficiency is far higher than that of an electromagnetic speed regulation motor system and a variable-frequency speed regulation system; after the pumping unit is started, two sets of identical independent star wiring windings are automatically connected in series to a power grid for operation, so the average output power of the alternating-current motor is automatically and accurately matched with the average consumption power of the pumping unit during operation, dynamic full balance during operation of the pumping unit is realized, and meanwhile, a problem of reverse power generation causing serious waste of electric energy is solved.

Description

technical field [0001] The invention relates to oil recovery technology in oilfields, in particular to a device that can highly self-adaptively follow the instantaneous speed change of a beam pumping unit, and use flexible torque dragging to eliminate the severe pulsation, reverse pull and load torque of the beam pumping unit. Flexible dragging method of pumping unit for "big horse-drawn cart" phenomenon. Background technique [0002] The beam pumping unit is a heavy-duty mechanical oil production equipment, and its various transmission parts weigh in tons, and the dynamic inertia force is very large during the transmission torque process. After the pumping unit is started under heavy load, it drives the beam pumping unit again under the condition of high and frequent severe pulsation of load torque, in order to start the beam pumping unit and tow the Torque peak, it is forced to use tens of kilowatts of high-power motors with frame size 280 or even 315 to complete the star...

AI Technical Summary

Problems solved by technology

During the "Eighth Five-Year Plan" period, Daqing Petroleum Administration Bureau and Daqing Petroleum Institute jointly undertook the national project "Research on Improving the Efficiency of Pumping Well System", many scientific research institutes and universities have invested manpower and financial resources in research and development of energy-saving pumping unit tractors. In the past 30 years, there have been many companies and nearly 30 teams specially organized to tackle pumping unit energy conservation. After decades of hard work, new pumping units and pumping units have been successfully developed and put into use. There are dozens of new dragging devices, but none of them have completely solved the problem

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