Oil and gas pipeline comprehensive protection method for high-voltage direct-current grounding electrode interference

Abstract

The invention discloses an oil and gas pipeline comprehensive protection method for high-voltage direct-current grounding electrode interference. The oil and gas pipeline comprehensive protection method includes steps of improving integrity of an anti-corrosion layer; setting insulation joints on a main pipeline and sectionally isolating the pipeline; subjecting the pipeline to drained current protection; protecting a negative electrode of the pipeline: additionally arranging a negative electrode protection station on the pipeline close to the high-voltage direct-current grounding electrode, subjecting the pipeline to the negative electrode protection by an impressed current method via a bidirectional forced electrical drainage device, and rectifying fluctuation of abnormal pipeline ground potentials; monitoring drainage protection effect via a remote monitoring system and a corrosion coupon. The oil and gas pipeline comprehensive protection method has the advantages that comprehensive and integral protection can be provided for the high-voltage direct-current grounding electrode interference, and pertinence, protection effect and safety are all improved as compared with those of a conventional stray current protection technology.

Description

technical field [0001] The invention relates to a comprehensive protection method for an oil and gas pipeline against the interference of a high-voltage DC grounding electrode. Background technique [0002] With the rapid development of my country's energy demand and the rapid construction of high-voltage direct current transmission and oil and gas pipeline projects, some pipe sections will inevitably enter the interference area of ​​high-voltage direct current transmission. There are quite a few grounding poles of converter stations that have been built in China, and the interference has the following characteristics: 1) The DC interference has a high corrosion rate. 2) The interference time is short, the current into the ground is huge, and the potential shift is severe. 3) The disturbance occurs during single-pole operation (fault or maintenance period), and the time is uncertain. 4) The polarity of the grounding electrode is random. When the positive electrode is groun...

AI Technical Summary

Problems solved by technology

There are quite a few grounding poles of converter stations built in China, and the interference has the following characteristics: 1) The DC interference has a large corrosion rate

2) The interference time is short, the current into the ground is huge, and the potential shift is severe

3) The interference occurs during unipolar operation (fault or maintenance period), and the time is uncertain

2) The instantaneous large current may burn the cathodic protection power supply equipment connected to the pipeline, and may also cause personal injury to the operator

3) The potential of the pipeline deviates from the normal value for a long time, and the cathodic protection of the pipeline cannot operate normally

[0003] At present, some units in the domestic electric power and petroleum industries have realized the seriousness of the problem of "oil and gas pipelines being interfered by high-voltage DC ground electrodes", but their interference protection technology is single, and a single drainage protection measure is usually adopted in accordance with conventional DC interference

The effect of this protection technology is uncertain, it has not been effectively combined with the line cathodic protection system, and it lacks timely monitoring means