Submersible linear motor liquid level measurement and control device

Abstract

A liquid level measurement and control device of a submersible linear motor, comprising a tailpipe of the submersible linear motor and a permanent magnet mover of the motor, characterized in that a A coil winding with an iron core, the current output end of the coil winding is connected to the pressure sensor at the bottom through a rectification and voltage stabilization circuit, and a balance capsule is assembled outside the pressure sensor. The advantages of the present invention are that the power supply is independent, stable, and low-voltage, which prevents the circuit in the sensing system from being broken down by high voltage, shortens the service life, and does not affect the working mode and working state of the original submersible linear motor. Self-generated power supply during operation, reducing electronic components, lowering the failure rate of the device, and improving the service life of the submersible linear motor liquid level measurement and control device. It realizes intelligence, high precision, real-time transmission and unattended operation.

Description

technical field [0001] The invention belongs to a downhole liquid level measurement and control device, in particular to a downhole liquid level detection device of a submersible linear motor. technical background [0002] At present, domestic and foreign oil production generally adopts oil production machinery consisting of pumping units, sucker rods and pumps. The existing oil production machinery has disadvantages such as large volume, high cost, large reactive power loss, and easy failure. Therefore, the researched and developed A "reciprocating electric submersible pump" (Chinese invention patent number: ZL200410050431.5) has changed the lifting method of crude oil extraction. The reciprocating electric submersible pump is suitable for oil, gas and water drainage. At present, the method of detecting downhole liquid level in oil fields and coalbed methane mostly adopts the acoustic wave test method, which is difficult to ensure the detection accuracy. Therefore, it is u...

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Problems solved by technology

At present, the method of detecting downhole liquid level in oil fields and coalbed methane mostly adopts the acoustic wave test method, which is difficult to ensure the detection accuracy, so it is urgent to provide an intelligent, high-precision liquid level measurement and control device to meet the needs of the current market

[0003] From a technical analysis, since oil production equipment mostly uses high voltage and high current power supply, if the power required by the sensing system is taken out from the inside of the submersible linear motor, the motor cannot detect the insulation when it goes downhole. Most of the unit components are low-voltage components, which cannot withstand the high voltage of the submersible linear motor. Therefore, the power supply of the downhole sensor needs low voltage, isolation, and DC voltage stabilization to ensure the normal operation of the sensor; If the power supply line of the sensor is run in parallel with the cable of the electric pump, the power supply line of the sensor will be interfered by the strong current of the cable of the electric pump, and the weak detection signal cannot be extracted, so the power supply of the downhole sensor is always a technical problem

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