GIC measuring method and device for buried oil-gas pipeline and cathodic protection device

Abstract

The invention discloses a measuring method and device for a buried oil-gas pipeline and a cathodic protection device. The GIC measuring method comprises the following steps: a current sensor is additionally mounted in an insulated-flange hook-line cable of the buried oil-gas pipeline so as to measure electric currents in the buried oil-gas pipeline; a current and voltage sensor is mounted in the cathodic protection device so as to measure electric currents and voltages in the cathodic protection device; a parameter identification method for on-line study is used to update the soil resistance parameters of the buried oil-gas pipeline, and calculate the GIC dynamic current of the buried oil-gas pipeline and the GIC dynamic current of the cathodic protection device in real time. Through the adoption of the measuring method disclosed by the invention, the problems in the indirect measurement of GIC and the dynamic current of the cathodic protection device are effectively solved; the GIC of the buried oil-gas pipeline at a cathodic protection station, and the GIC of the cathodic protection device at the cathodic protection station can be accurately monitored; the influence of a geomagnetic storm on the buried oil-gas pipeline can be correctly evaluated, and defensive measures can be taken in time to avoid major accidents.

Description

technical field [0001] The invention relates to the technical field of GIC monitoring of buried oil and gas pipelines, in particular to a GIC measurement method and device of buried oil and gas pipelines and cathodic protection devices. Background technique [0002] With the rapid development of the national economy, the country's demand for oil and natural gas is increasing year by year. Undoubtedly, the rapid construction and development of buried oil and gas pipelines (hereinafter referred to as pipelines) has effectively guaranteed the national energy supply and promoted economic development. But at the same time, if the pipeline has a safety failure, it will have a serious impact on the operation of the national economy. If the pipeline leaks and perforates, causing fire, explosion or accident, it will cause serious harm to people's lives, the environment and national property. Therefore, it should be strictly controlled from the aspects of design, construction and ope...

AI Technical Summary

Problems solved by technology

The pipe ground potential PSP will exceed the range of the national cathodic protection standard, thus making the traditional cathodic protection out of control. Therefore, geomagnetic storms will accelerate the corrosion of metal pipes

Second, for pipelines with localized corrosion, the higher the pipe-to-ground potential PSP, the greater the current flowing into or out of the existing localized corrosion, resulting in more serious corrosion and even arcing, which leads to sudden oil and gas leakage and explosions in the pipeline. ACCIDENT

Third, for equipment such as cathodic protection devices, instruments and sensors connected to pipelines with grounding points, the GIC current will affect their normal operation and even burn them through their grounding points

Since the resistance on the pipeline cannot be obtained accurately, the error is large

[0011] Therefore, the indirect method of measuring the pipeline GIC without using a current transformer needs information such as the pipeline and its environmental background parameters, and is also affected by the background electromagnetic field, so the measurement accuracy is poor

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