Self-generating wellhead heating method by utilizing permanent magnet motor of oil pumping unit

By using the heat generated by the self-generating power of the permanent magnet motor of the oil pump to heat the wellhead, the problems of heat dissipation of the control cabinet and freezing and blockage of the wellhead during the oil field machinery oil production process are solved, and the effect of saving electricity consumption and reducing operating costs is achieved.

CN119572183APending Publication Date: 2025-03-07BEIJING HUAHUI HENGTAI ENERGY TECH CO LTD
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Patent Information

Application Number
CN202411791045.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2025-03-07

AI Technical Summary

Technical Problem

During the oil field machinery oil production process, the brake resistance heat generated by the self-generating power of the permanent magnet motor is difficult to effectively dissipate heat, resulting in an increase in the heat dissipation cost of the control cabinet. At the same time, the oil production wellhead is prone to freezing and blockage in winter, which requires additional heating measures, which increases the power consumption.

Method used

The heat generated by self-generating power of the permanent magnet motor is consumed by voltage-dividing through heating resistors to achieve heating of the wellhead, which not only solves the heat dissipation problem of the control cabinet, but also provides insulation measures for the wellhead, saving electricity consumption.

Benefits of technology

By using the heat generated by the self-generating power of the permanent magnet motor to heat the wellhead, the problems of heat dissipation of the control cabinet and freezing and blocking of the wellhead are effectively solved, saving power consumption and reducing operating costs during the oil production process.

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Abstract

The invention relates to the technical field of oil field mechanical oil extraction, and belongs to a self-power-generation well mouth heating method through a pumping unit permanent magnet motor. As the permanent magnet motor is widely applied to an oil pumping unit, the problem of brake resistor heat generated by self power generation of the permanent magnet motor is urgently needed to be solved, an air cooling mode is mainly adopted for heat dissipation at present, and the heat dissipation cost of a control cabinet is increased and the generated heat energy is wasted due to the fact that the space of the control cabinet is narrow and small and the heat generated by a frequency converter also exists. However, due to climate reasons, when well fluid enters the gathering and transportation process from the wellhead, the oil extraction wellhead is easily frozen and blocked in winter, a heating belt needs to be wound around the wellhead, a heating source is provided, and a large amount of energy is consumed. Heat generated by self power generation of the permanent magnet motor is used for heat preservation of the wellhead, the heat dissipation problem of the control cabinet is solved, heat preservation measures are provided for the wellhead, and electric heating electric energy is saved. According to the basic principle of the method, when the balance weight of the pumping unit is larger than the stress of a sucker rod, the rotor speed of a permanent magnet motor is higher than that of a stator, the motor generates electricity reversely, the electric quantity is fed back to the interior of a frequency converter, the direct-current bus voltage is increased through an inversion unit, and when the direct-current bus voltage is detected to be higher than a threshold value through a braking unit; a heating band resistor channel is opened to reduce the direct-current bus voltage, the heating band divides the voltage, energy is consumed for heating, and the wellhead is heated.
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Description

[0001] Technical field: The present invention relates to the technical field of mechanical oil production in oil fields, and belongs to a method for heating a wellhead by using a permanent magnet motor of an oil pump to generate electricity.

[0002] Background technology: With the extensive application of permanent magnet motors in oil pumping units, the problem of heat generated by the brake resistors generated by the self-generation of permanent magnet motors needs to be solved. At present, air cooling is mainly used for heat dissipation. Due to the small space of the control cabinet and the heat generated by the inverter, the heat dissipation cost of the control cabinet is increased, and the generated heat energy is wasted. Due to climatic reasons, the oil wellhead is prone to freezing and blockage in winter when the well fluid enters the gathering and transportation process from the wellhead. It is necessary to wrap a heating belt around the wellhead and provide a heat source, which generates a lot of electricity consumption.

[0003] Invention content: The patent of this invention uses the heat generated by the self-generation of the permanent magnet motor to provide insulation for the wellhead, which not only solves the heat dissipation problem of the control cabinet, but also provides insulation measures for the wellhead and saves electric heating energy. Description of the drawings:

[0004] Figure 1 This is a schematic diagram of the self-generating heating principle of the permanent magnet motor of the present invention;

[0005] Figure 2 It is a schematic diagram of the on-site implementation of the permanent magnet motor self-generation heating of the present invention.

[0006] Among them, 1. frequency converter; 2. control cabinet; 3. inverter unit; 4. DC bus; 5. brake unit; 6. pumping unit; 7. bare rod and sucker rod; 8. permanent magnet motor; 9. heating belt resistor; 10. wellhead; Specific implementation plan:

[0007] The present invention discloses a method for heating a wellhead by using a self-generated electricity from a permanent magnet motor of an oil pump. A frequency converter (1) is installed in a control cabinet (2). The frequency converter (1) comprises an inverter unit (3), a DC bus (4) and a brake unit (5). When the counterweight of an oil pump (6) is greater than the force exerted by a bare rod and a pumping rod (7), the rotor speed of the permanent magnet motor (8) is faster than the stator. The permanent magnet motor (8) generates electricity in reverse, and the electricity is fed back to the inside of the frequency converter (1). The electricity passes through the inverter unit (3) to increase the voltage of the DC bus (4). When the brake unit (5) detects that the voltage of the DC bus (4) is higher than a threshold value (760V), a channel of a heating belt resistor (9) is opened to reduce the voltage of the DC bus (4). The heating belt resistor (9) divides the voltage and consumes energy to generate heat, thereby achieving heating of the wellhead (10).

Claims

1. Claim: The present invention is a method for heating a wellhead by using a permanent magnet motor for self-generation of oil pumping units, characterized in that: The frequency converter (1) is installed in a control cabinet (2). The frequency converter (1) includes an inverter unit (3), a DC bus (4) and a brake unit (5). When the counterweight of the pumping unit (6) is greater than the force on the bare rod and the pumping rod (7), the rotor speed of the permanent magnet motor (8) is faster than the stator, and the permanent magnet motor (8) generates reverse power. The power is fed back to the inside of the frequency converter (1), and the DC bus (4) voltage is increased through the inverter unit (3). When the brake unit (5) detects that the DC bus (4) voltage is higher than a threshold value (760V), the heating belt resistor (9) channel is opened to reduce the DC bus (4) voltage. The heating belt resistor (9) divides the voltage, consumes energy to generate heat, and achieves heating of the wellhead (10).