A kind of pulse constant potential power supply special for cathodic protection of oil well casing and its construction method

Abstract

The invention discloses a special constant-potential pulse power supply for protecting an oil well casing cathode, and the special constant-potential pulse power supply is characterized in that a microprocessor is connected with a sample signal filter amplification and treatment circuit, a GPRS (general packet radio service) module and a PWM (pulse width modulation) drive circuit; a full-bridge inverter is connected with an AC (alternating current) 380V power supply through a first rectifying and filtering unit; the full-bridge inverter is connected with a second rectifying and filtering unit through an intermediate-frequency voltage transformation unit; the second rectifying and filtering unit is connected with a chopper; the chopper is connected with the oil well casing; the sample signal filter amplification and treatment circuit is connected with a main power supply voltage sensor, a main power supply current sensor, an oil well casing potential sensor and an abnormal signal sensor; pulse current with controllable frequency, amplitude and duty ratio is generated in a main power circuit, external signals are collected and processed by a control unit and output parameters are adjusted such that the protection potential of the casing retains in the best range; the power supply has the advantages of small volume, light weight, and excellent dynamic characteristics and controllability.

Description

A special pulse constant potential power supply for oil well casing cathodic protection and its construction method technical field The invention belongs to the technical field of metal corrosion and protection, and specifically relates to a special pulse constant potential power supply for cathodic protection of oil well casing and its construction method, which is used in the field of pulse current cathodic protection of oil well casing, and can also be further extended and applied to oil and natural gas fields. Pulse current cathodic protection for pipelines, buried pipelines, and underground steel structures. Background technique Practice has shown that the traditional DC type oil well casing cathodic protection power supply system has problems such as insufficient casing protection depth, high energy consumption, and uneven distribution of current and potential. Recent studies have shown that cathodic protection of oil well casings with pulsed currents can effectively...

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Problems solved by technology

In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a special pulse constant potential power supply for oil well casing cathodic protection and its construction method, which solves the problem of insufficient casing protection depth and energy consumption in the traditional DC type potentiostat. High, uneven distribution of current and potential; it has the characteristics of small size, light weight, power dynamic characteristics and good controllability

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