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Squirrel-cage-shaped motor driven water injection pump load start pressure-stabilizing water injection apparatus

A squirrel-cage, water injection pump technology, applied in the direction of control of electromechanical transmission, control of generators, machines/engines, etc., can solve the problems of fluctuating return flow, water injection pump cannot start water injection pressure with load, etc., achieve small starting current, Realize the effect of starting with load and reducing temperature rise

Inactive Publication Date: 2016-04-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the water injection pump driven by the squirrel cage motor cannot start with load and the large return flow caused by the fluctuation of water injection pressure

Method used

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  • Squirrel-cage-shaped motor driven water injection pump load start pressure-stabilizing water injection apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] like figure 1 As shown, this embodiment provides a water injection pump driven by a squirrel-cage motor with load to start a stabilized water injection device, including a water injection pump 5, a squirrel-cage motor 6 that drives the water injection pump 5, and an intelligent vector frequency converter 1. Redundant pressure controller 2 and pressure sensor 4;

[0017] The intelligent vector frequency converter 1 is connected to the three-phase AC power supply, the pressure sensor 4 is arranged at the manifold end of the water injection pump 5, and the pressure sensor 4 feeds the pressure signal to the redundant pressure controller 2, and the redundant pressure controller 2 The received pressure signal and the frequency output of the intelligent vector inverter 1 form a closed-loop control, the intelligent vector inverter 1 is connected to the squirrel-cage motor 6, and the speed of the squirrel-cage motor 6 is changed through the output frequency of the intelligent ve...

Embodiment 2

[0021] On the basis of Embodiment 1, the intelligent vector frequency converter 1 is equipped with an output reactor 3, which increases the effective transmission distance from the frequency converter to the motor, effectively suppresses the instantaneous high voltage generated when the IGBT of the frequency converter switches, and reduces the impact of this voltage on Adverse effects on cable insulation and motors.

[0022] In this embodiment, the tail of the squirrel-cage motor 6 is provided with a strong cooling independent fan 7 to increase the exhaust air volume of the squirrel-cage motor 6 at low speed and reduce the temperature rise of the squirrel-cage motor 6 .

Embodiment 3

[0024] On the basis of Embodiment 2, the water injection pump driven by the squirrel-cage motor of the present invention is used to start the water injection device with load and start the water injection device with a power of 185kW. The water injection pump 5 driven by the squirrel-cage motor 6 (model 5DS-25.7 / 20 ) on the test run, the intelligent vector inverter 1 is connected to the three-phase AC power supply, and the intelligent vector inverter 1 controls the squirrel-cage motor 6 by connecting the output reactor 3, and the squirrel-cage motor 6 drives the water injection pump 5 to run. At 17MPa, the maximum starting current is 300A, which is less than the rated current of the motor, and the starting is relatively stable; when the target pressure is 18.5MPa, the fluctuation of the water injection pressure is less than 0.1MPa; after adding a strong cooling independent fan 7 at the tail of the motor, the temperature of the motor shell is reduced 5 ℃, completely eliminate th...

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Abstract

The present invention provides a squirrel-cage-shaped motor driven water injection pump load start pressure-stabilizing water injection apparatus. The apparatus comprises a water injection pump and a squirrel-cage-shaped motor that drives the water injection pump, and the apparatus further comprises a smart vector converter, a redundant pressure controller and a pressure sensor. According to the apparatus, magnetic field oriented vector control is carried out on the squirrel-cage-shaped motor by using the smart vector converter, so that output torque of the squirrel-cage-shaped motor at a low speed is increased, and a water injection pump load start can be implemented with a small starting current; real-time monitoring of a pressure change of water injection is performed by a pressure sensor; the redundant pressure controller carries out closed-loop control on a water injection pressure signal and frequency output of the smart vector converter, and the water injection pressure is adjusted by changing a rotation speed of the motor; and an independent fan is added at a tail of the squirrel-cage-shaped motor, so as to increase the exhaust volume of the squirrel-cage-shaped motor at a low speed and reduce the temperature of the motor.

Description

technical field [0001] The invention belongs to the technical field of oilfield water injection, and in particular relates to a water injection pump driven by a squirrel-cage motor with load and started to stabilize the pressure of the water injection device. Background technique [0002] In the development and production process of Changqing Oilfield, the water injection pressurization system is an important measure to ensure the completion of water injection. Currently, a squirrel-cage motor is generally used to drive a plunger water injection pump for pressurization. During the water injection process, due to factors such as changes in the number of water injection wells and dynamic adjustment of injection volume, it often occurs that the injection volume of the water injection station does not match the displacement of the water injection pump. Usually, water is injected with a pump displacement greater than the allocation volume. The excess high-pressure water is then p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/20F04B49/06
CPCF04B49/06
Inventor 冯建设薛建强王林平郭占春刘丰宁郑刚魏立军程颢刘一山晏耿成王曼张倩杨会丰覃川赵防震郭煜锴
Owner PETROCHINA CO LTD
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