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Motor control system for oil extractor in oil field

A technology of motor control and pumping unit, which is applied in the control system, vector control system, motor generator control, etc., can solve the problems of unfavorable energy saving and large energy loss, improve reliability and stability, save energy, The effect of improving energy efficiency

Inactive Publication Date: 2010-02-10
SHANGHAI EDRIVE
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  • Application Information

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Problems solved by technology

This energy consumption method of consuming the feedback energy on the resistor is very unfavorable to energy saving, especially in a large capacity or large inertia drag system, the energy loss is relatively large

Method used

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  • Motor control system for oil extractor in oil field
  • Motor control system for oil extractor in oil field

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with accompanying drawing.

[0019] see figure 1 , the motor control system for oilfield pumping units of the present invention includes multiple permanent magnet motors M1, M2, ..., Mn, a three-phase rectifier cabinet 1, a supercapacitor 2 and multiple inverters C1, C2, ... ..., Cn. Each permanent magnet motor is respectively connected with the drive of each pumping unit and adopts vector control frequency conversion speed regulation. The three-phase rectifier cabinet 1 is externally connected to a three-phase power frequency AC power grid and outputs a DC power supply with variable voltage amplitude. The positive terminal of the DC power supply is connected to the positive terminal of the supercapacitor 2, and the negative terminal is connected to the negative terminal of the supercapacitor 2; Capacitor 2 is a 10,000-farad high-efficiency supercapacitor, which outputs a DC power supply. The positiv...

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Abstract

The invention relates to a motor control system for an oil extractor in an oil field, which comprises a plurality of permanent magnet motors, a three-phase rectifying cabinet, a super capacitor and aplurality of inverters, wherein the three-phase rectifying cabinet is externally connected with a three-phase power-frequency alternating-current power grid and outputs a direct-current power supply;the positive end of the direct-current power supply is connected with the positive end of the super capacitor, while the negative end is connected with the negative end of the super capacitor; the positive end of the super capacitor is connected with the positive end of each of the inverters respectively, while the negative end is connected with the negative end of each of the inverters respectively; and the three-phase output end of each of the inverters is connected with the three-phase input end of each of the motors respectively. Through the direct-current parallel-in operation of the plurality of permanent magnet motors, the motor control system provides the energy generated by dropping potential energy of an oil extraction rod of the oil extractor in the oil field for the permanent magnet motors which raise electromotion so as to greatly improve the operation efficiency of the whole system.

Description

technical field [0001] The invention relates to an oil field pumping unit, in particular to a motor control system for an oil field pumping unit. Background technique [0002] For low-energy and low-yield oilfields, water injection is generally used to press oil into the well, and the oil is lifted from the formation by the pumping unit. Therefore, electricity costs account for a considerable proportion of the cost of extraction of such oil fields. However, the situation in downhole oil layers is very complicated: oil wells can be divided into rich oil wells and poor oil wells; oil quality can be divided into thin oil and heavy oil; oil also contains sand, wax, water, gas and other components; There will be a gap between the piston and the bush to cause leakage; the above factors make the load of the pumping unit motor change at all times. Most oil fields in my country use AC induction motors powered by industrial frequency. Since the stator frequency is not variable, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/06H02P3/18H02J15/00E21B43/00
Inventor 贡俊张舟云
Owner SHANGHAI EDRIVE
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