Study on the Applicability of Mutual Interference Protection Measures for Parallel Pipe-line Cathodic Protection System in Xinjiang Oilfield
The effectiveness and applicability of different cathodic protection designs and drainage pro-tection methods are evaluated by numerical simulation for the DC stray current interference generated by the cathodic protection systems of multiple parallel pipelines in Xinjiang Oilfield.The results show that for new parallel pipelines,the measure of cathodic protection station separation(staggered anode bed location)can eliminate the mutual interference of parallel pipelines and cathodic protection systems,and improve the cathodic protection effect.For parallel pipelines in service with a small coating damage rate(<2%),the measure of potential equalizing wire can be applied at the point where the cathodic pro-tection potential difference in parallel pipelines is maximum to reduce interference.For parallel pipelines with a large coating damage rate(>2%),deep well anode+potential equalizing wire combined cathod-ic protection is not recommended.For parallel pipelines in service operating in a low soil resistivity(<100 Ω·m)environment,sacrificial anode drainage protection measures can effectively reduce inter-ference.For parallel pipelines in service with high soil resistivity(≥200 Ω·m)and large coating dam-age rate(≥5%),reducing the distance between cathodic protection stations(anode bed)can reduce inter-ference.
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